engines={image=false textcolor=true vector=false text=true} tetml={filename={D:\drim\repository\projects\drim_81_0\metadata\b\8\b8e69119498b858450b639628ad3d661\b8e69119498b858450b639628ad3d661.para.xml} elements={annotations=false bookmarks=false destinations=false fields=false javascripts=false} } granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l Requirements R e q u i r e m e n t s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l Status: S t a t u s : Relevant R e l e v a n t Version: V e r s i o n : 3.02 3 . 0 2 TR3123 T R 3 1 2 3 Transformers T r a n s f o r m e r s Project P r o j e c t development d e v e l o p m e n t Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02, 3 . 0 2 , Document D o c u m e n t replaces r e p l a c e s version v e r s i o n 3.01 3 . 0 1 Relevant R e l e v a n t versions: v e r s i o n s : 3.01 3 . 0 1 (2017-09-08 ( 2 0 1 7 - 0 9 - 0 8 14:41) 1 4 : 4 1 ) 3.02 3 . 0 2 (2019-06-05 ( 2 0 1 9 - 0 6 - 0 5 13:56) 1 3 : 5 6 ) Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 1 1 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 2 2 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} 1 1 Objective, O b j e c t i v e , target t a r g e t group g r o u p and a n d provision p r o v i s i o n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5 1.1 1 . 1 Objective O b j e c t i v e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5 1.2 1 . 2 Target T a r g e t group g r o u p . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 6 1.3 1 . 3 Provision P r o v i s i o n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 6 2 2 Common C o m m o n design d e s i g n requirements r e q u i r e m e n t s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 6 2.1 2 . 1 General G e n e r a l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 6 2.2 2 . 2 Duty D u t y and a n d rating r a t i n g . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 8 2.3 2 . 3 Windings W i n d i n g s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 8 2.4 2 . 4 Neutral N e u t r a l points p o i n t s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 8 2.5 2 . 5 Core C o r e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 9 2.6 2 . 6 Noise N o i s e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 9 2.7 2 . 7 Terminals T e r m i n a l s and a n d wiring w i r i n g . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 9 2.8 2 . 8 Labelling L a b e l l i n g . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 1 0 2.9 2 . 9 Carriage C a r r i a g e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 1 0 2.10 2 . 1 0 Surface S u r f a c e treatment t r e a t m e n t . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 1 0 2.11 2 . 1 1 Vibration V i b r a t i o n damper d a m p e r . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 1 1 2.12 2 . 1 2 Tolerances T o l e r a n c e s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 1 1 3 3 Liquid-immersed L i q u i d - i m m e r s e d transformers t r a n s f o r m e r s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 1 1 3.1 3 . 1 General G e n e r a l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 1 1 3.2 3 . 2 Windings W i n d i n g s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 1 1 3.3 3 . 3 Insulating I n s u l a t i n g liquid l i q u i d . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 1 2 3.4 3 . 4 Tappings T a p p i n g s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 1 2 3.4.1 3 . 4 . 1 On-load O n - l o a d tap t a p changer, c h a n g e r , OLTC O L T C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 1 2 3.4.2 3 . 4 . 2 Off-circuit O f f - c i r c u i t tap t a p changer, c h a n g e r , OCTC O C T C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 1 3 3.5 3 . 5 Cooling C o o l i n g and a n d allowed a l l o w e d temperature t e m p e r a t u r e rise r i s e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 1 3 3.5.1 3 . 5 . 1 General G e n e r a l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 1 3 3.5.2 3 . 5 . 2 Conventional C o n v e n t i o n a l paper p a p e r – – oil o i l insulation i n s u l a t i o n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 1 3 3.5.3 3 . 5 . 3 High H i g h temperature t e m p e r a t u r e insulation i n s u l a t i o n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 1 4 3.6 3 . 6 Bushings B u s h i n g s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 1 4 3.7 3 . 7 Current C u r r e n t transformers t r a n s f o r m e r s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 1 5 3.8 3 . 8 Tank T a n k . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 1 5 3.9 3 . 9 Protective P r o t e c t i v e housing h o u s i n g for f o r cable c a b l e terminations t e r m i n a t i o n s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 1 6 3.10 3 . 1 0 Control C o n t r o l and a n d monitoring m o n i t o r i n g . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 1 6 3.11 3 . 1 1 Testing T e s t i n g . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 1 7 4 4 Dry D r y insulated i n s u l a t e d transformers t r a n s f o r m e r s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 1 7 4.1 4 . 1 Windings W i n d i n g s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 1 7 Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 3 3 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} 4.2 4 . 2 Tappings T a p p i n g s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 1 8 4.3 4 . 3 Core C o r e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 1 8 4.4 4 . 4 Cooling C o o l i n g and a n d allowed a l l o w e d temperature t e m p e r a t u r e rise r i s e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 1 8 4.5 4 . 5 Protective P r o t e c t i v e housing h o u s i n g . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 1 9 4.6 4 . 6 Requirement R e q u i r e m e n t for f o r climatic, c l i m a t i c , environmental e n v i r o n m e n t a l and a n d fire f i r e behaviour b e h a v i o u r classes c l a s s e s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 1 9 4.7 4 . 7 Control C o n t r o l and a n d monitoring m o n i t o r i n g . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2 0 4.8 4 . 8 Testing T e s t i n g . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2 0 5 5 Additional A d d i t i o n a l information i n f o r m a t i o n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2 0 5.1 5 . 1 Definitions D e f i n i t i o n s and a n d abbreviations a b b r e v i a t i o n s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2 0 5.2 5 . 2 Changes C h a n g e s from f r o m previous p r e v i o u s version v e r s i o n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2 1 5.3 5 . 3 References R e f e r e n c e s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2 2 Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 4 4 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l This T h i s document d o c u m e n t and a n d its i t s content, c o n t e n t , is i s for f o r authorized a u t h o r i z e d company c o m p a n y use u s e only o n l y 1 1 Objective, O b j e c t i v e , target t a r g e t group g r o u p and a n d provision p r o v i s i o n 1.1 1 . 1 Objective O b j e c t i v e The T h e specification s p e c i f i c a t i o n establishes e s t a b l i s h e s requirements r e q u i r e m e n t s for f o r design, d e s i g n , construction c o n s t r u c t i o n and a n d testing t e s t i n g of o f high h i g h voltage v o l t a g e transformers t r a n s f o r m e r s for f o r onshore o n s h o r e and a n d offshore o f f s h o r e service. s e r v i c e . The T h e specification s p e c i f i c a t i o n contains c o n t a i n s three t h r e e parts. p a r t s . Section S e c t i o n 2 2 is i s valid v a l i d for f o r all a l l transformers, t r a n s f o r m e r s , section s e c t i o n 3 3 is i s applicable a p p l i c a b l e to t o liquid-immersed l i q u i d - i m m e r s e d transformers, t r a n s f o r m e r s , and a n d section s e c t i o n 4 4 is i s applicable a p p l i c a b l e for f o r dry d r y insulated i n s u l a t e d transformers. t r a n s f o r m e r s . The T h e referred r e f e r r e d standards s t a n d a r d s are a r e either e i t h e r based b a s e d on o n IEC I E C or o r based b a s e d on o n IEEE. I E E E . The T h e standards s t a n d a r d s have h a v e been b e e n referred r e f e r r e d to t o by b y one o n e common c o m m o n number n u m b e r as a s shown s h o w n in i n section s e c t i o n 5.3. 5 . 3 . The T h e IEEE I E E E standards s t a n d a r d s are a r e applicable a p p l i c a b l e in i n US U S or o r Canada, C a n a d a , while w h i l e IEC I E C standards s t a n d a r d s are a r e applicable a p p l i c a b l e elsewhere. e l s e w h e r e . The T h e specification s p e c i f i c a t i o n is i s based b a s e d on o n IEC I E C 60076 6 0 0 7 6 or o r IEEE I E E E C57 C 5 7 whichever w h i c h e v e r are a r e applicable, a p p l i c a b l e , and a n d the t h e content c o n t e n t specifies: s p e c i f i e s : In I n more m o r e detail d e t a i l specific s p e c i f i c IEC I E C / / IEEE I E E E requirements. r e q u i r e m e n t s . Which W h i c h one o n e of o f several s e v e r a l optional o p t i o n a l IEC I E C / / IEEE I E E E alternatives a l t e r n a t i v e s to t o be b e used. u s e d . Requirements R e q u i r e m e n t s not n o t covered c o v e r e d in i n IEC I E C / / IEEE. I E E E . Alternative A l t e r n a t i v e requirements r e q u i r e m e n t s to t o be b e used u s e d instead i n s t e a d of o f requirements r e q u i r e m e n t s described d e s c r i b e d in i n IEC I E C / / IEEE. I E E E . The T h e specification s p e c i f i c a t i o n can c a n be b e used u s e d for f o r low l o w voltage v o l t a g e transformers, t r a n s f o r m e r s , such s u c h as a s 690 6 9 0 - - 400 4 0 0 V V transformers. t r a n s f o r m e r s . The T h e document d o c u m e n t can c a n be b e used u s e d as a s basis b a s i s for f o r Subsea S u b s e a transformers, t r a n s f o r m e r s , however h o w e v e r requirements r e q u i r e m e n t s related r e l a t e d to t o subsea s u b s e a environment e n v i r o n m e n t are a r e not n o t part p a r t of o f this t h i s document. d o c u m e n t . Generator G e n e r a t o r step-up s t e p - u p transformers t r a n s f o r m e r s to t o connect c o n n e c t wind w i n d turbines t u r b i n e s to t o a a network. n e t w o r k . These T h e s e transformers t r a n s f o r m e r s are a r e installed i n s t a l l e d in i n the t h e nacelle n a c e l l e or o r in i n the t h e tower t o w e r or o r outside o u t s i d e close c l o s e to t o the t h e wind w i n d turbine. t u r b i n e . Ref R e f IEC I E C 60076-16. 6 0 0 7 6 - 1 6 . Currently C u r r e n t l y there t h e r e is i s no n o comparable c o m p a r a b l e IEEE I E E E standard s t a n d a r d on o n this t h i s topic. t o p i c . Reactors R e a c t o r s are a r e not n o t covered c o v e r e d by b y this t h i s document. d o c u m e n t . Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 5 5 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l In I n this t h i s document d o c u m e n t the t h e IEC I E C terminology t e r m i n o l o g y is i s used u s e d for f o r Earth E a r t h instead i n s t e a d of o f the t h e ANSI A N S I terminology t e r m i n o l o g y which w h i c h is i s Ground. G r o u n d . 1.2 1 . 2 Target T a r g e t group g r o u p The T h e target t a r g e t group g r o u p for f o r this t h i s document d o c u m e n t is i s personnel p e r s o n n e l involved i n v o l v e d in i n preparing p r e p a r i n g technical t e c h n i c a l and a n d operational o p e r a t i o n a l requirements r e q u i r e m e n t s and a n d standards s t a n d a r d s to t o be b e applied a p p l i e d in i n project p r o j e c t development d e v e l o p m e n t work. w o r k . 1.3 1 . 3 Provision P r o v i s i o n Provision P r o v i s i o n is i s made m a d e in i n Management M a n a g e m e n t System S y s t e m (TR3020 ( T R 3 0 2 0 Electrical, E l e c t r i c a l , Technical T e c h n i c a l Requirements R e q u i r e m e n t s and a n d Standards). S t a n d a r d s ) . 2 2 Common C o m m o n design d e s i g n requirements r e q u i r e m e n t s 2.1 2 . 1 General G e n e r a l SR-47880 S R - 4 7 8 8 0 - - Design D e s i g n of o f transformers t r a n s f o r m e r s shall s h a l l be b e in i n accordance a c c o r d a n c e with: w i t h : IEC I E C IEEE I E E E IEC I E C 2011 2 0 1 1 Power P o w e r transformers, t r a n s f o r m e r s , Part P a r t IEEE I E E E 2010 2 0 1 0 General G e n e r a l Requirements R e q u i r e m e n t s for f o r 60076-1 6 0 0 7 6 - 1 1: 1 : General G e n e r a l C57.12.00 C 5 7 . 1 2 . 0 0 Liquid-Immersed L i q u i d - I m m e r s e d Distribution, D i s t r i b u t i o n , Power, P o w e r , and a n d Regulating R e g u l a t i n g IEEE I E E E 2010 2 0 1 0 Transformers T r a n s f o r m e r s C57.12.90 C 5 7 . 1 2 . 9 0 Test T e s t Code C o d e for f o r Liquid-Immersed L i q u i d - I m m e r s e d Distribution, D i s t r i b u t i o n , Power, P o w e r , and a n d Regulating R e g u l a t i n g Transformers T r a n s f o r m e r s IEC I E C 2011 2 0 1 1 Power P o w e r transformers, t r a n s f o r m e r s , Part P a r t IEEE I E E E 2010 2 0 1 0 General G e n e r a l Requirements R e q u i r e m e n t s for f o r 60076-2 6 0 0 7 6 - 2 2: 2 : Temperature T e m p e r a t u r e rise r i s e C57.12.00 C 5 7 . 1 2 . 0 0 Liquid-Immersed L i q u i d - I m m e r s e d Distribution, D i s t r i b u t i o n , Power, P o w e r , and a n d Regulating R e g u l a t i n g Transformers T r a n s f o r m e r s IEC I E C 2013 2 0 1 3 Power P o w e r transformers, t r a n s f o r m e r s , Part P a r t IEEE I E E E 2010 2 0 1 0 General G e n e r a l Requirements R e q u i r e m e n t s for f o r 60076-3 6 0 0 7 6 - 3 3: 3 : Insulation I n s u l a t i o n levels, l e v e l s , C57.12.00 C 5 7 . 1 2 . 0 0 Liquid-Immersed L i q u i d - I m m e r s e d Distribution, D i s t r i b u t i o n , dielectric d i e l e c t r i c tests t e s t s and a n d Power, P o w e r , and a n d Regulating R e g u l a t i n g external e x t e r n a l clearances c l e a r a n c e s in i n air a i r Transformers T r a n s f o r m e r s IEC I E C 2006 2 0 0 6 Power P o w e r transformers, t r a n s f o r m e r s , Part P a r t IEEE I E E E 2010 2 0 1 0 General G e n e r a l Requirements R e q u i r e m e n t s for f o r 60076-5 6 0 0 7 6 - 5 5: 5 : Ability A b i l i t y to t o withstand w i t h s t a n d C57.12.00 C 5 7 . 1 2 . 0 0 Liquid-Immersed L i q u i d - I m m e r s e d Distribution, D i s t r i b u t i o n , short s h o r t circuit c i r c u i t Power, P o w e r , and a n d Regulating R e g u l a t i n g Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 6 6 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} Transformers T r a n s f o r m e r s IEC I E C 60076-7 6 0 0 7 6 - 7 2005 2 0 0 5 Power P o w e r transformers, t r a n s f o r m e r s , Part P a r t 7: 7 : Loading L o a d i n g guide g u i d e for f o r oil- o i l - immersed i m m e r s e d power p o w e r transformers t r a n s f o r m e r s IEEE I E E E C57.12.00 C 5 7 . 1 2 . 0 0 2010 2 0 1 0 General G e n e r a l Requirements R e q u i r e m e n t s for f o r Liquid-Immersed L i q u i d - I m m e r s e d Distribution, D i s t r i b u t i o n , Power, P o w e r , and a n d Regulating R e g u l a t i n g Transformers T r a n s f o r m e r s IEC I E C 60076-10 6 0 0 7 6 - 1 0 2005 2 0 0 5 Power P o w e r transformers, t r a n s f o r m e r s , Part P a r t 10: 1 0 : Determination D e t e r m i n a t i o n of o f sound s o u n d levels l e v e l s IEEE I E E E C57.12.90 C 5 7 . 1 2 . 9 0 IEEE I E E E C57.12.91 C 5 7 . 1 2 . 9 1 2010 2 0 1 0 2011 2 0 1 1 Test T e s t Code C o d e for f o r Liquid-Immersed L i q u i d - I m m e r s e d Distribution, D i s t r i b u t i o n , Power, P o w e r , and a n d Regulating R e g u l a t i n g Transformers T r a n s f o r m e r s Test T e s t Code C o d e for f o r Dry-Type D r y - T y p e Distribution D i s t r i b u t i o n and a n d Power P o w e r Transformers T r a n s f o r m e r s IEC I E C 60076-11 6 0 0 7 6 - 1 1 2004 2 0 0 4 Power P o w e r transformers, t r a n s f o r m e r s , Part P a r t 11: 1 1 : Dry-type D r y - t y p e transformers t r a n s f o r m e r s IEEE I E E E C57.12.01 C 5 7 . 1 2 . 0 1 IEEE I E E E C57.12.91 C 5 7 . 1 2 . 9 1 2005 2 0 0 5 2011 2 0 1 1 General G e n e r a l Requirements R e q u i r e m e n t s for f o r Dry- D r y - Type T y p e Distribution D i s t r i b u t i o n and a n d Power P o w e r Transformers, T r a n s f o r m e r s , Including I n c l u d i n g Those T h o s e with w i t h Solid-Cast S o l i d - C a s t and/or a n d / o r Resin R e s i n Encapsulated E n c a p s u l a t e d Windings. W i n d i n g s . Test T e s t Code C o d e for f o r Dry-Type D r y - T y p e Distribution D i s t r i b u t i o n and a n d Power P o w e r Transformers T r a n s f o r m e r s IEC I E C 60076-12 6 0 0 7 6 - 1 2 2008 2 0 0 8 Power P o w e r transformers, t r a n s f o r m e r s , Part P a r t 12: 1 2 : Loading L o a d i n g guide g u i d e for f o r dry- d r y - type t y p e power p o w e r transformers t r a n s f o r m e r s IEEE I E E E C57.12.01 C 5 7 . 1 2 . 0 1 2005 2 0 0 5 General G e n e r a l Requirements R e q u i r e m e n t s for f o r Dry- D r y - Type T y p e Distribution D i s t r i b u t i o n and a n d Power P o w e r Transformers, T r a n s f o r m e r s , Including I n c l u d i n g Those T h o s e with w i t h Solid-Cast S o l i d - C a s t and/or a n d / o r Resin R e s i n Encapsulated E n c a p s u l a t e d Windings W i n d i n g s IEC I E C 60076-14 6 0 0 7 6 - 1 4 2013 2 0 1 3 Power P o w e r transformers, t r a n s f o r m e r s , Part P a r t 14: 1 4 : Design D e s i g n and a n d application a p p l i c a t i o n of o f liquid- l i q u i d - immersed i m m e r s e d power p o w e r transformers t r a n s f o r m e r s using u s i n g high- h i g h - temperature t e m p e r a t u r e insulation i n s u l a t i o n materials m a t e r i a l s IEEE I E E E 1276 1 2 7 6 2000 2 0 0 0 IEEE I E E E Guide G u i d e for f o r the t h e application a p p l i c a t i o n of o f High-Temperature H i g h - T e m p e r a t u r e Insulation I n s u l a t i o n Materials M a t e r i a l s in i n Liquid-Immersed L i q u i d - I m m e r s e d Power P o w e r Transformers T r a n s f o r m e r s Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 7 7 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l 2.2 2 . 2 Duty D u t y and a n d rating r a t i n g SR-47882 S R - 4 7 8 8 2 - - All A l l tappings t a p p i n g s shall s h a l l be b e full-power f u l l - p o w e r tappings. t a p p i n g s . SR-47883 S R - 4 7 8 8 3 - - Harmonic H a r m o n i c currents c u r r e n t s in i n e.g. e . g . converter c o n v e r t e r transformers t r a n s f o r m e r s will w i l l increase i n c r e a s e losses l o s s e s and a n d temperatures t e m p e r a t u r e s of o f the t h e windings w i n d i n g s and a n d nearby n e a r b y steel s t e e l parts p a r t s of o f the t h e transformer. t r a n s f o r m e r . The T h e effect e f f e c t of o f harmonic h a r m o n i c currents c u r r e n t s shall s h a l l be b e taken t a k e n into i n t o account a c c o u n t according a c c o r d i n g to t o IEC I E C 61378-1 6 1 3 7 8 - 1 or o r IEEE I E E E C57.18.10 C 5 7 . 1 8 . 1 0 respectively. r e s p e c t i v e l y . SR-47884 S R - 4 7 8 8 4 - - Ancillary A n c i l l a r y components c o m p o n e n t s and a n d construction c o n s t r u c t i o n features f e a t u r e s such s u c h as a s bushings, b u s h i n g s , cable-end c a b l e - e n d connections, c o n n e c t i o n s , tap-changing t a p - c h a n g i n g devices, d e v i c e s , internal i n t e r n a l leads, l e a d s , liquid l i q u i d expansion e x p a n s i o n space s p a c e etc., e t c . , shall s h a l l be b e dimensioned d i m e n s i o n e d in i n a a manner m a n n e r that t h a t will w i l l not n o t limit l i m i t the t h e loading l o a d i n g to t o less l e s s than t h a n the t h e capability c a p a b i l i t y of o f the t h e windings. w i n d i n g s . 2.3 2 . 3 Windings W i n d i n g s SR-47886 S R - 4 7 8 8 6 - - For F o r transformers t r a n s f o r m e r s rated r a t e d above a b o v e 16 1 6 MVA M V A all a l l tapped t a p p e d windings w i n d i n g s shall s h a l l be b e separate s e p a r a t e windings. w i n d i n g s . This T h i s means m e a n s that t h a t there t h e r e shall s h a l l not n o t be b e tappings t a p p i n g s made m a d e as a s an a n integrated i n t e g r a t e d part p a r t of o f a a winding. w i n d i n g . SR-47887 S R - 4 7 8 8 7 - - One O n e of o f the t h e windings w i n d i n g s shall s h a l l be b e delta d e l t a connected. c o n n e c t e d . For F o r a a stabilizing s t a b i l i z i n g winding w i n d i n g both b o t h ends e n d s of o f at a t least l e a s t one o n e corner c o r n e r of o f the t h e delta d e l t a shall s h a l l be b e brought b r o u g h t out o u t on o n separate s e p a r a t e bushings. b u s h i n g s . SR-47888 S R - 4 7 8 8 8 - - For F o r transformers t r a n s f o r m e r s with w i t h specifications s p e c i f i c a t i o n s based b a s e d on o n IEC: I E C : The T h e insulation i n s u l a t i o n level l e v e l for f o r low l o w voltage v o l t a g e transformers t r a n s f o r m e r s shall s h a l l be b e according a c c o r d i n g to t o U U m m ≤ ≤ 1.1 1 . 1 kV k V given g i v e n by b y table t a b l e 3 3 in i n section s e c t i o n 12.1 1 2 . 1 in i n IEC I E C 60076-11. 6 0 0 7 6 - 1 1 . SR-47889 S R - 4 7 8 8 9 - - Increased I n c r e a s e d losses l o s s e s due d u e to t o harmonic h a r m o n i c currents c u r r e n t s shall s h a l l be b e taken t a k e n into i n t o account a c c o u n t in i n thermal t h e r m a l dimensioning d i m e n s i o n i n g in i n accordance a c c o r d a n c e with w i t h IEC I E C 61378-1 6 1 3 7 8 - 1 or o r IEEE I E E E C57.18.10 C 5 7 . 1 8 . 1 0 respectively. r e s p e c t i v e l y . 2.4 2 . 4 Neutral N e u t r a l points p o i n t s SR-47891 S R - 4 7 8 9 1 - - Neutral N e u t r a l point(s) p o i n t ( s ) shall s h a l l have h a v e uniform u n i f o r m insulation i n s u l a t i o n if i f not n o t otherwise o t h e r w i s e stated s t a t e d in i n the t h e datasheet. d a t a s h e e t . The T h e transformer t r a n s f o r m e r shall s h a l l be b e designed d e s i g n e d for f o r operation o p e r a t i o n with w i t h neutral n e u t r a l points p o i n t s directly d i r e c t l y earthed, e a r t h e d , earthed e a r t h e d via v i a a a resistor r e s i s t o r or o r reactor, r e a c t o r , or o r isolated. i s o l a t e d . The T h e neutral n e u t r a l point(s) p o i n t ( s ) shall s h a l l be b e brought b r o u g h t out o u t on o n a a separate s e p a r a t e bushing. b u s h i n g . SR-47892 S R - 4 7 8 9 2 - - The T h e rated r a t e d current c u r r e n t of o f the t h e neutral n e u t r a l point p o i n t shall s h a l l be b e equal e q u a l to t o the t h e rated r a t e d current c u r r e n t of o f the t h e corresponding c o r r e s p o n d i n g transformer t r a n s f o r m e r windings w i n d i n g s terminals. t e r m i n a l s . SR-47893 S R - 4 7 8 9 3 - - Where W h e r e a a Neutral N e u t r a l Earth E a r t h Resistor R e s i s t o r (NER) ( N E R ) is i s specified s p e c i f i e d in i n datasheet, d a t a s h e e t , then t h e n the t h e resistor r e s i s t o r shall s h a l l be b e connected c o n n e c t e d between b e t w e e n the t h e neutral n e u t r a l point p o i n t and a n d the t h e earth e a r t h bar. b a r . A A current c u r r e n t transformer t r a n s f o r m e r shall s h a l l be b e Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 8 8 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l provided p r o v i d e d for f o r measuring m e a s u r i n g the t h e neutral n e u t r a l point p o i n t current. c u r r e n t . The T h e current c u r r e n t transformer t r a n s f o r m e r and a n d the t h e NER N E R shall s h a l l be b e mounted m o u n t e d in i n a a separate s e p a r a t e purpose p u r p o s e made m a d e enclosure e n c l o s u r e mounted m o u n t e d outside o u t s i d e of o f the t h e transformer t r a n s f o r m e r housing. h o u s i n g . SR-47894 S R - 4 7 8 9 4 - - The T h e CT C T shall s h a l l be b e according a c c o r d i n g to t o IEC I E C 61869-2 6 1 8 6 9 - 2 or o r IEEE I E E E C57.13 C 5 7 . 1 3 respectively. r e s p e c t i v e l y . All A l l secondary s e c o n d a r y leads l e a d s shall s h a l l be b e brought b r o u g h t out o u t to t o terminal t e r m i n a l blocks b l o c k s in i n the t h e cabinet. c a b i n e t . The T h e terminals t e r m i n a l s shall s h a l l be b e provided p r o v i d e d with w i t h short-circuiting s h o r t - c i r c u i t i n g links. l i n k s . SR-47895 S R - 4 7 8 9 5 - - The T h e cable c a b l e for f o r connection c o n n e c t i o n of o f the t h e NER N E R to t o the t h e transformer t r a n s f o r m e r neutral n e u t r a l point p o i n t must m u s t be b e dimensioned d i m e n s i o n e d for f o r overvoltages o v e r v o l t a g e s due d u e to t o e.g. e . g . failures f a i l u r e s in i n other o t h e r part p a r t of o f the t h e network. n e t w o r k . 2.5 2 . 5 Core C o r e SR-47897 S R - 4 7 8 9 7 - - All A l l metal m e t a l parts p a r t s of o f the t h e core, c o r e , frame, f r a m e , tank t a n k etc. e t c . shall s h a l l be b e bonded b o n d e d to t o earth. e a r t h . SR-47898 S R - 4 7 8 9 8 - - The T h e core c o r e sheets s h e e t s of o f the t h e magnetic m a g n e t i c circuit c i r c u i t of o f transformers t r a n s f o r m e r s exceeding e x c e e d i n g 16 1 6 MVA M V A shall s h a l l be b e bonded b o n d e d to t o the t h e core c o r e clamping c l a m p i n g structure s t r u c t u r e through t h r o u g h at a t least l e a s t one o n e removable r e m o v a b l e core-insulation c o r e - i n s u l a t i o n test t e s t link. l i n k . The T h e link l i n k shall s h a l l be b e placed p l a c e d in i n an a n accessible a c c e s s i b l e position. p o s i t i o n . With W i t h the t h e bond b o n d removed, r e m o v e d , the t h e core c o r e sheets s h e e t s of o f the t h e magnetic m a g n e t i c circuit c i r c u i t shall s h a l l be b e insulated i n s u l a t e d from f r o m the t h e core c o r e clamping c l a m p i n g and a n d all a l l structural s t r u c t u r a l parts. p a r t s . 2.6 2 . 6 Noise N o i s e SR-47900 S R - 4 7 9 0 0 - - If I f not n o t otherwise o t h e r w i s e is i s specified s p e c i f i e d in i n the t h e datasheet d a t a s h e e t at a t then t h e n the t h e sound s o u n d pressure p r e s s u r e level l e v e l when w h e n the t h e transformer t r a n s f o r m e r is i s energised, e n e r g i s e d , plus p l u s when w h e n cooling c o o l i n g equipment e q u i p m e n t and a n d any a n y oil-circulating o i l - c i r c u l a t i n g pumps p u m p s are a r e in i n service, s e r v i c e , shall s h a l l not n o t exceed e x c e e d 85 8 5 dB(A) d B ( A ) at a t 1m 1 m distance d i s t a n c e measured m e a s u r e d according a c c o r d i n g to t o IEC I E C 60076-10 6 0 0 7 6 - 1 0 or o r IEEE I E E E C57.12.90 C 5 7 . 1 2 . 9 0 and a n d IEEE I E E E C57.12.91 C 5 7 . 1 2 . 9 1 respectively. r e s p e c t i v e l y . 2.7 2 . 7 Terminals T e r m i n a l s and a n d wiring w i r i n g SR-47902 S R - 4 7 9 0 2 - - Marking M a r k i n g of o f internal i n t e r n a l components c o m p o n e n t s and a n d wiring w i r i n g shall s h a l l be b e according a c c o r d i n g to t o TR3120 T R 3 1 2 0 section s e c t i o n 4.11. 4 . 1 1 . SR-47903 S R - 4 7 9 0 3 - - All A l l signals s i g n a l s from f r o m instruments, i n s t r u m e n t s , Current C u r r e n t Transformers T r a n s f o r m e r s CTs, C T s , sensors s e n s o r s etc. e t c . shall s h a l l be b e connected c o n n e c t e d in i n a a separate s e p a r a t e cabinet. c a b i n e t . Internal I n t e r n a l wiring w i r i n g shall s h a l l be b e according a c c o r d i n g to t o TR3120 T R 3 1 2 0 section s e c t i o n 4.10. 4 . 1 0 . SR-47904 S R - 4 7 9 0 4 - - Light L i g h t fixture f i x t u r e and a n d space s p a c e heaters h e a t e r s inside i n s i d e cabinets c a b i n e t s shall s h a l l be b e according a c c o r d i n g to t o TR3120 T R 3 1 2 0 section s e c t i o n 4.17. 4 . 1 7 . SR-47905 S R - 4 7 9 0 5 - - Earthing E a r t h i n g of o f the t h e transformer t r a n s f o r m e r shall s h a l l be b e according a c c o r d i n g to t o TR3120 T R 3 1 2 0 section s e c t i o n 4.8 4 . 8 (high ( h i g h voltage v o l t a g e equipment). e q u i p m e n t ) . SR-47906 S R - 4 7 9 0 6 - - The T h e transformer t r a n s f o r m e r shall s h a l l be b e provided p r o v i d e d with w i t h a a minimum m i n i m u m of o f two t w o earth e a r t h terminals t e r m i n a l s for f o r connection c o n n e c t i o n to t o the t h e external e x t e r n a l earth e a r t h grid. g r i d . The T h e terminals t e r m i n a l s shall s h a l l be b e located l o c a t e d on o n opposite o p p o s i t e sides s i d e s of o f the t h e Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 9 9 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l transformer t r a n s f o r m e r to t o enable e n a b l e easy e a s y connection c o n n e c t i o n to t o the t h e earth e a r t h grid. g r i d . Both B o t h terminals t e r m i n a l s shall s h a l l be b e boss b o s s type t y p e to t o enable e n a b l e connection c o n n e c t i o n via v i a lugs. l u g s . SR-47907 S R - 4 7 9 0 7 - - For F o r transformers t r a n s f o r m e r s with w i t h specifications s p e c i f i c a t i o n s based b a s e d on o n IEEE, I E E E , 2 2 hole h o l e lugs l u g s shall s h a l l be b e provided. p r o v i d e d . 2.8 2 . 8 Labelling L a b e l l i n g SR-47909 S R - 4 7 9 0 9 - - The T h e requirement r e q u i r e m e n t for f o r labelling l a b e l l i n g is i s stated s t a t e d in i n TR3120. T R 3 1 2 0 . SR-47910 S R - 4 7 9 1 0 - - The T h e rating r a t i n g plate p l a t e shall s h a l l be b e in i n accordance a c c o r d a n c e with w i t h requirements r e q u i r e m e n t s in i n : : IEC I E C IEEE I E E E IEC I E C 2011 2 0 1 1 Power P o w e r transformers, t r a n s f o r m e r s , Part P a r t IEEE I E E E 2010 2 0 1 0 General G e n e r a l Requirements R e q u i r e m e n t s for f o r 60076-1 6 0 0 7 6 - 1 1: 1 : General G e n e r a l C57.12.00 C 5 7 . 1 2 . 0 0 Liquid-Immersed L i q u i d - I m m e r s e d Distribution, D i s t r i b u t i o n , Power, P o w e r , and a n d Regulating R e g u l a t i n g IEEE I E E E 2010 2 0 1 0 Transformers T r a n s f o r m e r s C57.12.90 C 5 7 . 1 2 . 9 0 Test T e s t Code C o d e for f o r Liquid-Immersed L i q u i d - I m m e r s e d Distribution, D i s t r i b u t i o n , Power, P o w e r , and a n d Regulating R e g u l a t i n g Transformers T r a n s f o r m e r s IEC I E C 2011 2 0 1 1 Converter C o n v e r t e r Transformers, T r a n s f o r m e r s , IEEE I E E E 1998 1 9 9 8 Practices P r a c t i c e s and a n d Requirements R e q u i r e m e n t s for f o r 61378-1 6 1 3 7 8 - 1 Part P a r t 1: 1 : Transformers T r a n s f o r m e r s for f o r C57.18.10 C 5 7 . 1 8 . 1 0 Semiconductor S e m i c o n d u c t o r Power P o w e r Rectifier R e c t i f i e r industrial i n d u s t r i a l applications a p p l i c a t i o n s Transformers T r a n s f o r m e r s 2.9 2 . 9 Carriage C a r r i a g e SR-47912 S R - 4 7 9 1 2 - - Transformers T r a n s f o r m e r s shall s h a l l be b e provided p r o v i d e d with w i t h lifting l i f t i n g lugs l u g s to t o enable e n a b l e lifting l i f t i n g of o f the t h e complete c o m p l e t e unit. u n i t . 2.10 2 . 1 0 Surface S u r f a c e treatment t r e a t m e n t SR-47914 S R - 4 7 9 1 4 - - Surface S u r f a c e and a n d protective p r o t e c t i v e coating c o a t i n g for f o r transformers t r a n s f o r m e r s located l o c a t e d outdoor o u t d o o r in i n natural n a t u r a l ventilated v e n t i l a t e d area a r e a shall s h a l l be b e according a c c o r d i n g to t o TR0042 T R 0 0 4 2 cl c l 2. 2 . The T h e manufacturer’s m a n u f a c t u r e r ’ s standard s t a n d a r d painting p a i n t i n g system s y s t e m and a n d standard s t a n d a r d colour c o l o u r are a r e acceptable a c c e p t a b l e for f o r transformers t r a n s f o r m e r s located l o c a t e d in i n a a mechanically m e c h a n i c a l l y ventilated v e n t i l a t e d area. a r e a . SR-47915 S R - 4 7 9 1 5 - - Isocyanate-based I s o c y a n a t e - b a s e d products p r o d u c t s (e.g. ( e . g . polyurethanes) p o l y u r e t h a n e s ) or o r products p r o d u c t s that t h a t release r e l e a s e di- d i - isocyanates i s o c y a n a t e s when w h e n heated h e a t e d shall s h a l l not n o t be b e used. u s e d . Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 10 1 0 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l 2.11 2 . 1 1 Vibration V i b r a t i o n damper d a m p e r SR-47917 S R - 4 7 9 1 7 - - Use U s e of o f vibration v i b r a t i o n dampers d a m p e r s shall s h a l l be b e evaluated e v a l u a t e d to t o ensure e n s u r e that t h a t transformers t r a n s f o r m e r s do d o not n o t cause c a u s e unwanted u n w a n t e d vibration v i b r a t i o n and a n d noise n o i s e to t o their t h e i r surroundings. s u r r o u n d i n g s . 2.12 2 . 1 2 Tolerances T o l e r a n c e s SR-47919 S R - 4 7 9 1 9 - - The T h e tolerances t o l e r a n c e s shall s h a l l be b e according a c c o r d i n g to t o IEC I E C 60076-1 6 0 0 7 6 - 1 or o r IEEE I E E E C57.12.00 C 5 7 . 1 2 . 0 0 and a n d IEEE I E E E C57.12.90 C 5 7 . 1 2 . 9 0 respectively. r e s p e c t i v e l y . SR-47920 S R - 4 7 9 2 0 - - The T h e plus p l u s tolerance t o l e r a n c e for f o r the t h e noise n o i s e level l e v e l is i s zero, z e r o , i.e. i . e . the t h e measured m e a s u r e d noise n o i s e level l e v e l shall s h a l l be b e equal e q u a l to t o or o r below b e l o w the t h e stated s t a t e d limit. l i m i t . 3 3 Liquid-immersed L i q u i d - i m m e r s e d transformers t r a n s f o r m e r s 3.1 3 . 1 General G e n e r a l SR-47923 S R - 4 7 9 2 3 - - The T h e transformer t r a n s f o r m e r shall s h a l l have h a v e IP-rating I P - r a t i n g according a c c o r d i n g to t o requirements r e q u i r e m e n t s for f o r outdoor o u t d o o r or o r naturally n a t u r a l l y vented v e n t e d area a r e a in i n TR3120 T R 3 1 2 0 cl c l 3.1. 3 . 1 . 3.2 3 . 2 Windings W i n d i n g s See S e e section s e c t i o n 2.3 2 . 3 in i n this t h i s document d o c u m e n t for f o r general g e n e r a l requirements. r e q u i r e m e n t s . SR-47926 S R - 4 7 9 2 6 - - For F o r transformers t r a n s f o r m e r s based b a s e d on o n IEEE I E E E specifications s p e c i f i c a t i o n s the t h e insulation i n s u l a t i o n paper p a p e r of o f the t h e windings w i n d i n g s shall s h a l l be b e thermally t h e r m a l l y upgraded u p g r a d e d IEC I E C 60076-1 6 0 0 7 6 - 1 or o r IEEE I E E E C57.12.00 C 5 7 . 1 2 . 0 0 and a n d IEEE I E E E C57.12.90 C 5 7 . 1 2 . 9 0 respectively. r e s p e c t i v e l y . See S e e requirements r e q u i r e m e n t s for f o r high h i g h temperature t e m p e r a t u r e design d e s i g n in i n section s e c t i o n 3.5.3. 3 . 5 . 3 . SR-47928 S R - 4 7 9 2 8 - - The T h e rated r a t e d withstand w i t h s t a n d voltages v o l t a g e s for f o r transformer t r a n s f o r m e r windings w i n d i n g s shall s h a l l be b e selected s e l e c t e d to t o the t h e highest h i g h e s t value v a l u e as a s given g i v e n in i n table t a b l e 2 2 in i n IEC I E C 60076-3. 6 0 0 7 6 - 3 . Values V a l u e s indicated i n d i c a t e d with w i t h “note “ n o t e a” a ” in i n table t a b l e 2 2 in i n IEC I E C 60076-3 6 0 0 7 6 - 3 shall s h a l l not n o t be b e used. u s e d . Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 11 1 1 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l 3.3 3 . 3 Insulating I n s u l a t i n g liquid l i q u i d SR-47930 S R - 4 7 9 3 0 - - Mineral M i n e r a l inhibited i n h i b i t e d oil o i l according a c c o r d i n g to t o IEC I E C 60296 6 0 2 9 6 or o r IEEE I E E E C57.106 C 5 7 . 1 0 6 shall s h a l l be b e used u s e d for f o r transformers t r a n s f o r m e r s with w i t h U U m m equal e q u a l to t o or o r above a b o v e 72,5 7 2 , 5 kV k V or o r 69 6 9 kV k V for f o r IEC I E C or o r IEEE I E E E based b a s e d specifications, s p e c i f i c a t i o n s , respectively. r e s p e c t i v e l y . SR-47931 S R - 4 7 9 3 1 - - Silicone S i l i c o n e type t y p e oil o i l can c a n be b e used u s e d for f o r transformers t r a n s f o r m e r s with w i t h U U m m equal e q u a l to t o or o r below b e l o w 36 3 6 kV k V or o r 34,5 3 4 , 5 kV k V for f o r IEC I E C or o r IEEE I E E E based b a s e d specifications. s p e c i f i c a t i o n s . SR-47932 S R - 4 7 9 3 2 - - Silicone S i l i c o n e type t y p e oil o i l shall s h a l l not n o t be b e used u s e d for f o r transformers t r a n s f o r m e r s with w i t h On-Load O n - L o a d Tap T a p Changer, C h a n g e r , OLTC, O L T C , due d u e to t o the t h e poor p o o r lubrication l u b r i c a t i o n of o f the t h e tap t a p contacts. c o n t a c t s . SR-47933 S R - 4 7 9 3 3 - - Use U s e of o f insulation i n s u l a t i o n liquids l i q u i d s for f o r allowing a l l o w i n g temperatures t e m p e r a t u r e s above a b o v e 105°C, 1 0 5 ° C , e.g. e . g . listed l i s t e d in i n /9/, / 9 / , shall s h a l l not n o t be b e used u s e d for f o r transformers t r a n s f o r m e r s with w i t h U U m m equal e q u a l to t o or o r above a b o v e 72,5 7 2 , 5 kV k V or o r 69 6 9 kV k V for f o r IEC I E C or o r IEEE I E E E based b a s e d specifications s p e c i f i c a t i o n s due d u e to t o the t h e limited l i m i t e d experience e x p e r i e n c e of o f dielectric d i e l e c t r i c withstand w i t h s t a n d capability c a p a b i l i t y of o f such s u c h insulating i n s u l a t i n g liquids. l i q u i d s . 3.4 3 . 4 Tappings T a p p i n g s 3.4.1 3 . 4 . 1 On-load O n - l o a d tap t a p changer, c h a n g e r , OLTC O L T C SR-47936 S R - 4 7 9 3 6 - - If I f an a n OLTC O L T C is i s specified, s p e c i f i e d , then t h e n the t h e following f o l l o w i n g shall s h a l l apply: a p p l y : The T h e OLTC O L T C and a n d the t h e corresponding c o r r e s p o n d i n g motor m o t o r drive d r i v e cabinet c a b i n e t shall s h a l l be b e in i n accordance a c c o r d a n c e with w i t h IEC I E C 60214-1 6 0 2 1 4 - 1 or o r IEEE I E E E C57.131 C 5 7 . 1 3 1 respectively. r e s p e c t i v e l y . A A protective p r o t e c t i v e device d e v i c e shall s h a l l be b e installed i n s t a l l e d to t o detect d e t e c t sudden s u d d e n pressure p r e s s u r e increase i n c r e a s e in i n the t h e diverter d i v e r t e r switch s w i t c h oil o i l compartment. c o m p a r t m e n t . Light L i g h t fixture f i x t u r e and a n d space s p a c e heaters h e a t e r s inside i n s i d e cabinet c a b i n e t shall s h a l l be b e according a c c o r d i n g to t o TR3120 T R 3 1 2 0 section s e c t i o n 4.17. 4 . 1 7 . Manholes M a n h o l e s shall s h a l l be b e provided p r o v i d e d for f o r accessing a c c e s s i n g the t h e contacts c o n t a c t s of o f the t h e OLTC O L T C during d u r i n g servicing. s e r v i c i n g . Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 12 1 2 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l 3.4.2 3 . 4 . 2 Off-circuit O f f - c i r c u i t tap t a p changer, c h a n g e r , OCTC O C T C SR-47938 S R - 4 7 9 3 8 - - If I f an a n OCTC O C T C is i s specified, s p e c i f i e d , then t h e n the t h e following f o l l o w i n g shall s h a l l apply: a p p l y : The T h e OCTC O C T C and a n d the t h e corresponding c o r r e s p o n d i n g motor m o t o r drive d r i v e cabinet c a b i n e t shall s h a l l be b e in i n accordance a c c o r d a n c e with w i t h IEC I E C 60214-1 6 0 2 1 4 - 1 or o r IEEE I E E E C57.131 C 5 7 . 1 3 1 respectively. r e s p e c t i v e l y . The T h e number n u m b e r of o f positions p o s i t i o n s shall s h a l l be b e 5 5 unless u n l e s s otherwise o t h e r w i s e agreed. a g r e e d . There T h e r e shall s h a l l be b e a a locking l o c k i n g device d e v i c e at a t the t h e manual m a n u a l drive d r i v e mechanism m e c h a n i s m which w h i c h requires r e q u i r e s a a deliberate d e l i b e r a t e act a c t by b y the t h e operator o p e r a t o r to t o remove r e m o v e it i t before b e f o r e operating o p e r a t i n g the t h e drive. d r i v e . The T h e manual m a n u a l drive d r i v e mechanism m e c h a n i s m shall s h a l l be b e capable c a p a b l e of o f being b e i n g locked l o c k e d in i n any a n y one o n e of o f the t h e tap t a p positions. p o s i t i o n s . If I f a a motor m o t o r drive d r i v e is i s specified, s p e c i f i e d , then t h e n the t h e light l i g h t fixture f i x t u r e and a n d space s p a c e heaters h e a t e r s inside i n s i d e cabinet c a b i n e t shall s h a l l be b e according a c c o r d i n g to t o TR3120 T R 3 1 2 0 section s e c t i o n 4.17. 4 . 1 7 . 3.5 3 . 5 Cooling C o o l i n g and a n d allowed a l l o w e d temperature t e m p e r a t u r e rise r i s e 3.5.1 3 . 5 . 1 General G e n e r a l The T h e external e x t e r n a l cooling c o o l i n g medium m e d i u m is i s either e i t h e r air a i r or o r water. w a t e r . SR-47942 S R - 4 7 9 4 2 - - The T h e yearly y e a r l y average a v e r a g e ambient a m b i e n t cooling c o o l i n g medium m e d i u m temperature t e m p e r a t u r e is i s stated s t a t e d in i n the t h e datasheet. d a t a s h e e t . Otherwise O t h e r w i s e the t h e yearly y e a r l y average a v e r a g e temperature t e m p e r a t u r e shall s h a l l be b e as a s stated s t a t e d in i n IEC I E C 60076-2 6 0 0 7 6 - 2 or o r IEEE I E E E C57.12.00 C 5 7 . 1 2 . 0 0 respectively. r e s p e c t i v e l y . SR-47943 S R - 4 7 9 4 3 - - In I n case c a s e of o f water w a t e r cooling, c o o l i n g , the t h e coolers c o o l e r s shall s h a l l be b e of o f double d o u b l e wall w a l l design, d e s i g n , and a n d shall s h a l l be b e equipped e q u i p p e d with w i t h a a leakage l e a k a g e monitoring m o n i t o r i n g system. s y s t e m . All A l l water w a t e r exposed e x p o s e d materials m a t e r i a l s in i n the t h e cooler c o o l e r shall s h a l l be b e compatible c o m p a t i b l e with w i t h the t h e cooling c o o l i n g water. w a t e r . SR-47944 S R - 4 7 9 4 4 - - Plate P l a t e and a n d Frame F r a m e Heat H e a t Exchangers E x c h a n g e r s shall s h a l l be b e according a c c o r d i n g to t o cl c l 2 2 in i n TR0041. T R 0 0 4 1 . The T h e flanges f l a n g e s for f o r the t h e water w a t e r side s i d e of o f the t h e heat h e a t exchanger e x c h a n g e r shall s h a l l be b e according a c c o r d i n g to t o cl c l 2 2 in i n TR2000. T R 2 0 0 0 . 3.5.2 3 . 5 . 2 Conventional C o n v e n t i o n a l paper p a p e r – – oil o i l insulation i n s u l a t i o n The T h e stated s t a t e d yearly y e a r l y average a v e r a g e temperature t e m p e r a t u r e of o f the t h e external e x t e r n a l cooling c o o l i n g medium m e d i u m is i s 20 2 0 °C ° C for f o r IEC I E C and a n d 30 3 0 °C ° C for f o r IEEE I E E E based b a s e d specifications. s p e c i f i c a t i o n s . SR-47947 S R - 4 7 9 4 7 - - The T h e average a v e r a g e temperature t e m p e r a t u r e rise r i s e of o f the t h e transformer t r a n s f o r m e r windings w i n d i n g s at a t rated r a t e d power p o w e r shall s h a l l not n o t exceed e x c e e d 65 6 5 K, K , and a n d the t h e top t o p oil o i l temperature t e m p e r a t u r e shall s h a l l not n o t exceed e x c e e d 60 6 0 K. K . Reference R e f e r e n c e is i s made m a d e to t o IEC I E C 60076-1 6 0 0 7 6 - 1 or o r IEEE I E E E C57.12.00 C 5 7 . 1 2 . 0 0 and a n d IEEE I E E E C57.12.90 C 5 7 . 1 2 . 9 0 respectively. r e s p e c t i v e l y . SR-47948 S R - 4 7 9 4 8 - - If I f the t h e yearly y e a r l y average a v e r a g e temperature t e m p e r a t u r e of o f the t h e external e x t e r n a l cooling c o o l i n g medium m e d i u m given g i v e n by b y the t h e Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 13 1 3 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l datasheet d a t a s h e e t exceeds e x c e e d s the t h e stated s t a t e d yearly y e a r l y average a v e r a g e temperature t e m p e r a t u r e from f r o m the t h e standards s t a n d a r d s (IEC ( I E C 60076-1 6 0 0 7 6 - 1 or o r IEEE I E E E C57.12.00 C 5 7 . 1 2 . 0 0 and a n d IEEE I E E E C57.12.90 C 5 7 . 1 2 . 9 0 respectively), r e s p e c t i v e l y ) , then t h e n the t h e average a v e r a g e temperature t e m p e r a t u r e rise r i s e limit l i m i t of o f the t h e transformer t r a n s f o r m e r windings w i n d i n g s and a n d top t o p oil o i l shall s h a l l be b e reduced r e d u c e d by b y the t h e same s a m e amount a m o u n t as a s the t h e excess. e x c e s s . Three T h r e e examples e x a m p l e s are a r e given g i v e n for f o r yearly y e a r l y average a v e r a g e external e x t e r n a l cooling c o o l i n g medium m e d i u m excess e x c e s s temperatures t e m p e r a t u r e s of o f 0 0 K, K , 10 1 0 K K and a n d 20 2 0 K K respectively. r e s p e c t i v e l y . Table T a b l e 1: 1 : Allowed A l l o w e d temperature t e m p e r a t u r e rises r i s e s of o f average a v e r a g e windings w i n d i n g s and a n d top t o p oil o i l Yearly Y e a r l y average a v e r a g e excess e x c e s s temperature t e m p e r a t u r e of o f Limit L i m i t for f o r average a v e r a g e temperature t e m p e r a t u r e rise r i s e of o f Limit L i m i t for f o r temperature t e m p e r a t u r e rise r i s e of o f external e x t e r n a l cooling c o o l i n g medium m e d i u m transformer t r a n s f o r m e r windings w i n d i n g s transformer t r a n s f o r m e r top t o p oil o i l 0 0 K K 65 6 5 K K 60 6 0 K K 10 1 0 K K 55 5 5 K K 50 5 0 K K 20 2 0 K K 45 4 5 K K 40 4 0 K K 3.5.3 3 . 5 . 3 High H i g h temperature t e m p e r a t u r e insulation i n s u l a t i o n High H i g h temperature t e m p e r a t u r e insulation i n s u l a t i o n design d e s i g n is i s based b a s e d on o n temperatures t e m p e r a t u r e s in i n excess e x c e s s of o f thermal t h e r m a l class c l a s s 105 1 0 5 °C, ° C , for f o r the t h e solid s o l i d insulation, i n s u l a t i o n , see s e e reference r e f e r e n c e IEC I E C 60076-14 6 0 0 7 6 - 1 4 or o r IEEE I E E E 1276 1 2 7 6 respectively. r e s p e c t i v e l y . SR-47952 S R - 4 7 9 5 2 - - The T h e high h i g h temperature t e m p e r a t u r e design d e s i g n shall s h a l l as a s a a minimum m i n i m u m be b e based b a s e d on o n hybrid h y b r i d insulation i n s u l a t i o n system. s y s t e m . The T h e average a v e r a g e temperature t e m p e r a t u r e rise r i s e of o f the t h e transformer t r a n s f o r m e r windings w i n d i n g s at a t rated r a t e d power p o w e r shall s h a l l not n o t exceed e x c e e d 95 9 5 K, K , and a n d the t h e top t o p oil o i l temperature t e m p e r a t u r e shall s h a l l not n o t exceed e x c e e d 60 6 0 K. K . Reference R e f e r e n c e to t o other o t h e r requirements r e q u i r e m e n t s in i n IEC I E C 60076-14 6 0 0 7 6 - 1 4 or o r IEEE I E E E 1276 1 2 7 6 respectively.. r e s p e c t i v e l y . . SR-47953 S R - 4 7 9 5 3 - - Minimum M i n i m u m thermal t h e r m a l class c l a s s for f o r the t h e high-temperature h i g h - t e m p e r a t u r e solid s o l i d insulation i n s u l a t i o n shall s h a l l be b e 155 1 5 5 °C. ° C . SR-47954 S R - 4 7 9 5 4 - - If I f the t h e yearly y e a r l y average a v e r a g e temperature t e m p e r a t u r e of o f the t h e external e x t e r n a l cooling c o o l i n g medium m e d i u m from f r o m the t h e datasheet d a t a s h e e t exceeds e x c e e d s the t h e stated s t a t e d yearly y e a r l y average a v e r a g e temperature t e m p e r a t u r e from f r o m the t h e standards s t a n d a r d s (IEC ( I E C 60076-1 6 0 0 7 6 - 1 or o r IEEE I E E E C57.12.00 C 5 7 . 1 2 . 0 0 and a n d IEEE I E E E C57.12.90 C 5 7 . 1 2 . 9 0 respectively), r e s p e c t i v e l y ) , then t h e n the t h e average a v e r a g e temperature t e m p e r a t u r e rise r i s e limit l i m i t of o f the t h e transformer t r a n s f o r m e r windings w i n d i n g s and a n d top t o p oil o i l shall s h a l l be b e reduced r e d u c e d by b y the t h e same s a m e amount a m o u n t as a s the t h e excess. e x c e s s . 3.6 3 . 6 Bushings B u s h i n g s Type T y p e of o f bushings b u s h i n g s will w i l l be b e described d e s c r i b e d in i n datasheet. d a t a s h e e t . SR-47957 S R - 4 7 9 5 7 - - For F o r air a i r insulated i n s u l a t e d bushings b u s h i n g s the t h e IP I P code c o d e of o f the t h e protective p r o t e c t i v e housing h o u s i n g for f o r cable c a b l e terminations t e r m i n a t i o n s shall s h a l l be b e according a c c o r d i n g to t o section s e c t i o n 3.1, 3 . 1 , if i f not n o t otherwise o t h e r w i s e stated. s t a t e d . SR-47958 S R - 4 7 9 5 8 - - For F o r plug-in p l u g - i n type t y p e bushing b u s h i n g or o r equivalent e q u i v a l e n t touch t o u c h proof p r o o f solution, s o l u t i o n , a a portable p o r t a b l e earthing e a r t h i n g device d e v i c e shall s h a l l be b e delivered, d e l i v e r e d , if i f not n o t otherwise o t h e r w i s e stated. s t a t e d . SR-47959 S R - 4 7 9 5 9 - - It I t shall s h a l l be b e provision p r o v i s i o n for f o r measuring m e a s u r i n g voltage v o l t a g e at a t the t h e bushing b u s h i n g to t o be b e able a b l e to t o check c h e c k if i f the t h e Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 14 1 4 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l transformer t r a n s f o r m e r is i s energized. e n e r g i z e d . SR-47960 S R - 4 7 9 6 0 - - The T h e transformer t r a n s f o r m e r bushings b u s h i n g s shall s h a l l be b e of o f outdoor o u t d o o r type, t y p e , and a n d shall s h a l l comply c o m p l y with w i t h IEC I E C 60137 6 0 1 3 7 or o r IEEE I E E E C57.19.00 C 5 7 . 1 9 . 0 0 respectively.. r e s p e c t i v e l y . . 3.7 3 . 7 Current C u r r e n t transformers t r a n s f o r m e r s SR-47962 S R - 4 7 9 6 2 - - The T h e CT C T shall s h a l l be b e according a c c o r d i n g to t o IEC I E C 61869-2 6 1 8 6 9 - 2 or o r IEEE I E E E C57.13 C 5 7 . 1 3 respectively.. r e s p e c t i v e l y . . 3.8 3 . 8 Tank T a n k See S e e requirements r e q u i r e m e n t s in i n section s e c t i o n 2.9. 2 . 9 . SR-47965 S R - 4 7 9 6 5 - - The T h e transformer t r a n s f o r m e r tank t a n k shall s h a l l be b e designed d e s i g n e d for f o r a a static s t a t i c overpressure o v e r p r e s s u r e of o f at a t least l e a s t 1 1 barg. b a r g . SR-47966 S R - 4 7 9 6 6 - - The T h e transformer t r a n s f o r m e r skid s k i d base b a s e shall s h a l l be b e designed d e s i g n e d for f o r handling h a n d l i n g of o f the t h e liquid l i q u i d filled f i l l e d transformer. t r a n s f o r m e r . SR-47967 S R - 4 7 9 6 7 - - Jacking J a c k i n g pads p a d s should s h o u l d be b e available a v a i l a b l e on o n the t h e transformer t r a n s f o r m e r tank t a n k to t o allow a l l o w jacking j a c k i n g of o f the t h e liquid l i q u i d filled f i l l e d transformer. t r a n s f o r m e r . SR-47968 S R - 4 7 9 6 8 - - There T h e r e shall s h a l l be b e valves v a l v e s provided p r o v i d e d for f o r at a t least: l e a s t : Liquid L i q u i d filling, f i l l i n g , draining d r a i n i n g and a n d venting v e n t i n g of o f all a l l liquid l i q u i d volumes. v o l u m e s . Liquid L i q u i d sampling s a m p l i n g from f r o m top t o p of o f the t h e tank. t a n k . The T h e valve v a l v e shall s h a l l be b e placed p l a c e d within w i t h i n reach r e a c h from f r o m the t h e floor f l o o r such s u c h that t h a t there t h e r e is i s no n o need n e e d to t o use u s e of o f scaffolding s c a f f o l d i n g or o r a a ladder l a d d e r for f o r sampling. s a m p l i n g . Isolating I s o l a t i n g external e x t e r n a l cooling c o o l i n g equipment e q u i p m e n t from f r o m transformer t r a n s f o r m e r tank. t a n k . Isolating I s o l a t i n g each e a c h compartment c o m p a r t m e n t of o f the t h e conservator c o n s e r v a t o r tank t a n k from f r o m the t h e transformer t r a n s f o r m e r tank. t a n k . SR-47969 S R - 4 7 9 6 9 - - A A moisture-removing m o i s t u r e - r e m o v i n g breather b r e a t h e r shall s h a l l be b e provided p r o v i d e d for f o r each e a c h chamber c h a m b e r of o f the t h e oil o i l conservator c o n s e r v a t o r tank. t a n k . SR-47970 S R - 4 7 9 7 0 - - Transformers T r a n s f o r m e r s with w i t h U U m m equal e q u a l to t o or o r above a b o v e 24 2 4 kV k V shall s h a l l have h a v e a a diaphragm-type d i a p h r a g m - t y p e oil o i l preservation p r e s e r v a t i o n system s y s t e m to t o avoid a v o i d direct d i r e c t contact c o n t a c t between b e t w e e n the t h e transformer t r a n s f o r m e r oil o i l and a n d air. a i r . A A flexible f l e x i b l e diaphragm d i a p h r a g m or o r bladder b l a d d e r shall s h a l l be b e used u s e d for f o r this t h i s purpose. p u r p o s e . SR-47971 S R - 4 7 9 7 1 - - The T h e liquid l i q u i d conservator c o n s e r v a t o r shall s h a l l have h a v e a a separate s e p a r a t e compartment c o m p a r t m e n t for f o r the t h e OLTC O L T C diverter d i v e r t e r switch s w i t c h oil o i l if i f OLTC O L T C is i s part p a r t of o f the t h e transformer. t r a n s f o r m e r . For F o r this t h i s compartment c o m p a r t m e n t a a free f r e e breathing b r e a t h i n g system s y s t e m can c a n be b e used. u s e d . SR-47972 S R - 4 7 9 7 2 - - 316L 3 1 6 L stainless s t a i n l e s s steel s t e e l shall s h a l l be b e used u s e d for f o r fasteners f a s t e n e r s (screws, ( s c r e w s , bolts, b o l t s , nuts, n u t s , etc.) e t c . ) up u p to t o and a n d including i n c l u d i n g a a diameter d i a m e t e r of o f 10 1 0 mm. m m . For F o r diameters d i a m e t e r s above a b o v e 10 1 0 mm m m fasteners f a s t e n e r s shall s h a l l be b e hot h o t dip d i p Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 15 1 5 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l galvanised g a l v a n i s e d in i n accordance a c c o r d a n c e with w i t h ASTM A S T M A153 A 1 5 3 or o r coated c o a t e d with w i t h PTFE P T F E with w i t h anticorrosion a n t i c o r r o s i o n pre- p r e - treatment t r e a t m e n t such s u c h as a s cermet. c e r m e t . The T h e requirement r e q u i r e m e n t for f o r fasteners f a s t e n e r s does d o e s not n o t apply a p p l y to t o fasteners f a s t e n e r s inside i n s i d e the t h e transformer t r a n s f o r m e r tank. t a n k . 3.9 3 . 9 Protective P r o t e c t i v e housing h o u s i n g for f o r cable c a b l e terminations t e r m i n a t i o n s SR-47975 S R - 4 7 9 7 5 - - The T h e IP I P rating r a t i n g for f o r protective p r o t e c t i v e housing h o u s i n g shall s h a l l be b e according a c c o r d i n g to t o requirements r e q u i r e m e n t s in i n section s e c t i o n 3.1. 3 . 1 . SR-47976 S R - 4 7 9 7 6 - - It I t shall s h a l l be b e possible p o s s i b l e to t o measure m e a s u r e voltage v o l t a g e at a t the t h e terminals t e r m i n a l s before b e f o r e removal r e m o v a l of o f the t h e protective p r o t e c t i v e housing h o u s i n g of o f the t h e cable c a b l e terminals. t e r m i n a l s . 3.10 3 . 1 0 Control C o n t r o l and a n d monitoring m o n i t o r i n g SR-47978 S R - 4 7 9 7 8 - - The T h e following f o l l o w i n g instrumentations i n s t r u m e n t a t i o n s shall s h a l l be b e provided p r o v i d e d as a s a a minimum: m i n i m u m : Oil O i l level l e v e l gauges g a u g e s for f o r each e a c h compartment c o m p a r t m e n t of o f the t h e conservator c o n s e r v a t o r tank. t a n k . The T h e gauges g a u g e s shall s h a l l have h a v e contacts c o n t a c t s for f o r high h i g h and a n d low l o w oil o i l level. l e v e l . Gas G a s relay r e l a y installed i n s t a l l e d in i n the t h e pipe p i p e between b e t w e e n transformer t r a n s f o r m e r tank t a n k and a n d conservator. c o n s e r v a t o r . The T h e relay r e l a y shall s h a l l have h a v e contacts c o n t a c t s for f o r alarm a l a r m and a n d trip t r i p indicating i n d i c a t i n g slow s l o w gas g a s development d e v e l o p m e n t or o r rapid r a p i d pressure p r e s s u r e build b u i l d up. u p . Hermetically H e r m e t i c a l l y sealed s e a l e d transformers t r a n s f o r m e r s shall s h a l l be b e equipped e q u i p p e d with w i t h pressure p r e s s u r e relief r e l i e f device. d e v i c e . The T h e device d e v i c e shall s h a l l have h a v e contact c o n t a c t for f o r the t h e trip t r i p circuit. c i r c u i t . Top T o p oil o i l temperature t e m p e r a t u r e measurement m e a s u r e m e n t enabling e n a b l i n g local l o c a l and a n d remote r e m o t e reading. r e a d i n g . There T h e r e shall s h a l l be b e two t w o sets s e t s of o f contacts. c o n t a c t s . One O n e for f o r the t h e alarm a l a r m circuit c i r c u i t and a n d one o n e for f o r the t h e trip t r i p circuit. c i r c u i t . Winding W i n d i n g temperature t e m p e r a t u r e indication i n d i c a t i o n based b a s e d on o n thermal t h e r m a l image i m a g e enabling e n a b l i n g local l o c a l and a n d remote r e m o t e reading. r e a d i n g . There T h e r e shall s h a l l be b e two t w o sets s e t s of o f contacts. c o n t a c t s . One O n e for f o r the t h e alarm a l a r m circuit c i r c u i t and a n d one o n e for f o r the t h e trip t r i p circuit. c i r c u i t . For F o r OLTC O L T C pressure p r e s s u r e increase i n c r e a s e device d e v i c e (see ( s e e section s e c t i o n 3.4.1), 3 . 4 . 1 ) , there t h e r e shall s h a l l be b e contact c o n t a c t for f o r the t h e trip t r i p circuit. c i r c u i t . In I n case c a s e of o f OFWF O F W F cooling c o o l i n g – – there t h e r e shall s h a l l be b e a a water w a t e r leakage l e a k a g e monitoring m o n i t o r i n g system s y s t e m enabling e n a b l i n g remote r e m o t e indication. i n d i c a t i o n . In I n case c a s e of o f Oil O i l Forced, F o r c e d , OF, O F , cooling c o o l i n g – – there t h e r e shall s h a l l be b e an a n oil o i l flow f l o w indicating i n d i c a t i n g system s y s t e m enabling e n a b l i n g remote r e m o t e indication. i n d i c a t i o n . Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 16 1 6 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l 3.11 3 . 1 1 Testing T e s t i n g SR-47980 S R - 4 7 9 8 0 - - Routine R o u t i n e tests t e s t s shall s h a l l be b e in i n accordance a c c o r d a n c e with w i t h IEC I E C 60076-1 6 0 0 7 6 - 1 or o r IEEE I E E E C57.12.00 C 5 7 . 1 2 . 0 0 and a n d IEEE I E E E C57.12.90 C 5 7 . 1 2 . 9 0 respectively.. r e s p e c t i v e l y . . SR-47981 S R - 4 7 9 8 1 - - The T h e following f o l l o w i n g non-routine n o n - r o u t i n e tests t e s t s listed l i s t e d in i n IEC I E C 60076-1 6 0 0 7 6 - 1 or o r IEEE I E E E C57.12.00 C 5 7 . 1 2 . 0 0 and a n d IEEE I E E E C57.12.90 C 5 7 . 1 2 . 9 0 respectively r e s p e c t i v e l y shall s h a l l be b e performed: p e r f o r m e d : Temperature-rise T e m p e r a t u r e - r i s e test t e s t for f o r transformers t r a n s f o r m e r s rated r a t e d 16 1 6 MVA M V A and a n d above. a b o v e . Determination D e t e r m i n a t i o n of o f capacitances c a p a c i t a n c e s windings-to-earth, w i n d i n g s - t o - e a r t h , and a n d between b e t w e e n windings w i n d i n g s for f o r all a l l converter c o n v e r t e r transformers t r a n s f o r m e r s Audible A u d i b l e sound s o u n d level. l e v e l . SR-47982 S R - 4 7 9 8 2 - - If I f several s e v e r a l identical i d e n t i c a l transformers t r a n s f o r m e r s are a r e ordered, o r d e r e d , the t h e non-routine n o n - r o u t i n e test t e s t should s h o u l d be b e performed p e r f o r m e d on o n one o n e transformer t r a n s f o r m e r only. o n l y . SR-47983 S R - 4 7 9 8 3 - - A A dissolved d i s s o l v e d gas g a s in i n oil o i l analysis a n a l y s i s shall s h a l l be b e performed p e r f o r m e d according a c c o r d i n g to t o IEC I E C 60076-2 6 0 0 7 6 - 2 or o r IEEE I E E E C57.12.00 C 5 7 . 1 2 . 0 0 respectively. r e s p e c t i v e l y . 4 4 Dry D r y insulated i n s u l a t e d transformers t r a n s f o r m e r s 4.1 4 . 1 Windings W i n d i n g s See S e e section s e c t i o n 2.3 2 . 3 in i n this t h i s document d o c u m e n t for f o r general g e n e r a l requirements. r e q u i r e m e n t s . SR-47987 S R - 4 7 9 8 7 - - The T h e insulation i n s u l a t i o n level l e v e l shall s h a l l be b e according a c c o r d i n g to: t o : List L i s t 2 2 in i n table t a b l e 3 3 of o f section s e c t i o n 12.1 1 2 . 1 for f o r the t h e IEC-based I E C - b a s e d specification s p e c i f i c a t i o n IEC I E C 60076-11. 6 0 0 7 6 - 1 1 . The T h e highest h i g h e s t indicated i n d i c a t e d basic b a s i c lightning l i g h t n i n g impulse i m p u l s e level l e v e l stated s t a t e d in i n table t a b l e 5 5 in i n section s e c t i o n 5.10 5 . 1 0 for f o r the t h e IEEE I E E E based b a s e d specification s p e c i f i c a t i o n IEEE I E E E C57.12.01 C 5 7 . 1 2 . 0 1 and a n d IEEE I E E E C57.12.91. C 5 7 . 1 2 . 9 1 . SR-47988 S R - 4 7 9 8 8 - - The T h e minimum m i n i m u m winding w i n d i n g insulation i n s u l a t i o n class c l a s s shall s h a l l be: b e : 155°C 1 5 5 ° C (insulation ( i n s u l a t i o n class c l a s s F) F ) for f o r IEC I E C based b a s e d specifications s p e c i f i c a t i o n s (IEC ( I E C 60076-11) 6 0 0 7 6 - 1 1 ) 150°C 1 5 0 ° C for f o r IEEE I E E E based b a s e d specifications s p e c i f i c a t i o n s (IEEE ( I E E E C57.12.01 C 5 7 . 1 2 . 0 1 and a n d IEEE I E E E C57.12.91). C 5 7 . 1 2 . 9 1 ) . SR-47989 S R - 4 7 9 8 9 - - Corresponding C o r r e s p o n d i n g winding w i n d i n g hot h o t spot s p o t temperature t e m p e r a t u r e shall s h a l l be b e in i n accordance a c c o r d a n c e with w i t h IEC I E C 60076-12 6 0 0 7 6 - 1 2 or o r IEEE I E E E C57.12.01 C 5 7 . 1 2 . 0 1 respectively. r e s p e c t i v e l y . Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 17 1 7 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l SR-47990 S R - 4 7 9 9 0 - - The T h e windings w i n d i n g s shall s h a l l be b e solid-casted s o l i d - c a s t e d or o r VPI. V P I . SR-47991 S R - 4 7 9 9 1 - - All A l l terminals t e r m i n a l s shall s h a l l be b e of o f copper c o p p e r type. t y p e . This T h i s also a l s o applies a p p l i e s when w h e n aluminium a l u m i n i u m windings w i n d i n g s is i s specified. s p e c i f i e d . 4.2 4 . 2 Tappings T a p p i n g s SR-47993 S R - 4 7 9 9 3 - - The T h e tapping t a p p i n g shall s h a l l be b e on o n the t h e primary p r i m a r y windings, w i n d i n g s , with w i t h steps s t e p s of o f approximately a p p r o x i m a t e l y +/- + / - 2 2 x x 2.5% 2 . 5 % of o f rated r a t e d voltage v o l t a g e if i f not n o t specified s p e c i f i e d otherwise. o t h e r w i s e . SR-47994 S R - 4 7 9 9 4 - - OCTC O C T C tapping t a p p i n g selection s e l e c t i o n should s h o u l d be b e made m a d e by b y the t h e use u s e of o f bolted b o l t e d links l i n k s instead i n s t e a d of o f off- o f f - circuit c i r c u i t tap-changers t a p - c h a n g e r s SR-47995 S R - 4 7 9 9 5 - - If I f OLTC O L T C is i s specified, s p e c i f i e d , then t h e n the t h e corresponding c o r r e s p o n d i n g motor m o t o r drive d r i v e cabinet c a b i n e t shall s h a l l be b e in i n accordance a c c o r d a n c e with w i t h IEC I E C 60214-1 6 0 2 1 4 - 1 or o r IEEE I E E E C57.131 C 5 7 . 1 3 1 respectively. r e s p e c t i v e l y . 4.3 4 . 3 Core C o r e SR-47997 S R - 4 7 9 9 7 - - The T h e transformer t r a n s f o r m e r core c o r e shall s h a l l be b e dimensioned d i m e n s i o n e d for f o r continuous c o n t i n u o u s operation o p e r a t i o n at a t 110 1 1 0 % % of o f rated r a t e d voltage v o l t a g e referred r e f e r r e d to t o the t h e principal p r i n c i p a l tapping t a p p i n g and a n d rated r a t e d power. p o w e r . This T h i s is i s an a n additional a d d i t i o n a l requirement r e q u i r e m e n t to t o IEC I E C 60076-11 6 0 0 7 6 - 1 1 or o r IEEE I E E E C57.12.01 C 5 7 . 1 2 . 0 1 and a n d IEEE I E E E C57.12.91 C 5 7 . 1 2 . 9 1 respectively. r e s p e c t i v e l y . 4.4 4 . 4 Cooling C o o l i n g and a n d allowed a l l o w e d temperature t e m p e r a t u r e rise r i s e SR-47999 S R - 4 7 9 9 9 - - The T h e yearly y e a r l y average a v e r a g e ambient a m b i e n t cooling c o o l i n g air a i r temperature t e m p e r a t u r e is i s stated s t a t e d in i n the t h e datasheet. d a t a s h e e t . Otherwise O t h e r w i s e the t h e yearly y e a r l y average a v e r a g e temperature t e m p e r a t u r e shall s h a l l be b e as a s stated s t a t e d in i n IEC I E C 60076-11 6 0 0 7 6 - 1 1 or o r IEEE I E E E C57.12.01 C 5 7 . 1 2 . 0 1 and a n d IEEE I E E E C57.12.91 C 5 7 . 1 2 . 9 1 respectively.. r e s p e c t i v e l y . . SR-48000 S R - 4 8 0 0 0 - - The T h e stated s t a t e d yearly y e a r l y average a v e r a g e temperature t e m p e r a t u r e of o f the t h e external e x t e r n a l cooling c o o l i n g medium m e d i u m is i s 20 2 0 °C ° C for f o r IEC I E C and a n d 30 3 0 °C ° C for f o r IEEE I E E E based b a s e d specifications. s p e c i f i c a t i o n s . The T h e corresponding c o r r e s p o n d i n g average a v e r a g e temperature t e m p e r a t u r e rise r i s e of o f the t h e transformer t r a n s f o r m e r windings w i n d i n g s at a t rated r a t e d power p o w e r shall s h a l l not n o t exceed e x c e e d 100 1 0 0 K K for f o r IEC I E C and a n d 90 9 0 K K for f o r IEEE I E E E based b a s e d specifications. s p e c i f i c a t i o n s . Reference R e f e r e n c e is i s made m a d e to t o IEC I E C 60076-11 6 0 0 7 6 - 1 1 or o r IEEE I E E E C57.12.01 C 5 7 . 1 2 . 0 1 and a n d IEEE I E E E C57.12.91 C 5 7 . 1 2 . 9 1 respectively. r e s p e c t i v e l y . SR-48001 S R - 4 8 0 0 1 - - If I f the t h e yearly y e a r l y average a v e r a g e temperature t e m p e r a t u r e of o f the t h e external e x t e r n a l cooling c o o l i n g air a i r given g i v e n by b y the t h e datasheet d a t a s h e e t exceeds e x c e e d s the t h e stated s t a t e d yearly y e a r l y average a v e r a g e temperature t e m p e r a t u r e from f r o m the t h e standards s t a n d a r d s IEC I E C 60076-11 6 0 0 7 6 - 1 1 or o r IEEE I E E E C57.12.01 C 5 7 . 1 2 . 0 1 and a n d IEEE I E E E C57.12.91 C 5 7 . 1 2 . 9 1 respectively, r e s p e c t i v e l y , then t h e n the t h e average a v e r a g e temperature t e m p e r a t u r e rise r i s e limit l i m i t of o f the t h e transformer t r a n s f o r m e r windings w i n d i n g s shall s h a l l be b e reduced r e d u c e d by b y the t h e same s a m e amount a m o u n t as a s the t h e excess. e x c e s s . Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 18 1 8 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l 4.5 4 . 5 Protective P r o t e c t i v e housing h o u s i n g See S e e requirements r e q u i r e m e n t s in i n TR3120. T R 3 1 2 0 . SR-48004 S R - 4 8 0 0 4 - - The T h e transformer t r a n s f o r m e r shall s h a l l be b e in i n a a housing h o u s i n g that t h a t is i s cooled c o o l e d by b y external e x t e r n a l air a i r or o r water w a t e r SR-48005 S R - 4 8 0 0 5 - - The T h e IP I P rating r a t i n g for f o r the t h e protective p r o t e c t i v e housing h o u s i n g shall s h a l l be b e according a c c o r d i n g to t o requirements r e q u i r e m e n t s in i n section s e c t i o n 3.1. 3 . 1 . SR-48006 S R - 4 8 0 0 6 - - Doors D o o r s and a n d panels p a n e l s shall s h a l l be b e hinged. h i n g e d . There T h e r e shall s h a l l be b e isolating i s o l a t i n g bars b a r s behind b e h i n d the t h e doors. d o o r s . The T h e bars b a r s shall s h a l l be b e coloured c o l o u r e d yellow y e l l o w and a n d black b l a c k (zebra ( z e b r a stripes) s t r i p e s ) if i f not n o t otherwise o t h e r w i s e required r e q u i r e d by b y national n a t i o n a l regulation. r e g u l a t i o n . SR-48007 S R - 4 8 0 0 7 - - Transformer T r a n s f o r m e r enclosures e n c l o s u r e s for f o r ratings r a t i n g s equal e q u a l to t o or o r greater g r e a t e r than t h a n 315 3 1 5 kVA k V A should s h o u l d be b e equipped e q u i p p e d with w i t h windows w i n d o w s that t h a t allow a l l o w thermo t h e r m o graphic g r a p h i c inspection. i n s p e c t i o n . 4.6 4 . 6 Requirement R e q u i r e m e n t for f o r climatic, c l i m a t i c , environmental e n v i r o n m e n t a l and a n d fire f i r e behaviour b e h a v i o u r classes c l a s s e s SR-48009 S R - 4 8 0 0 9 - - The T h e climatic, c l i m a t i c , environmental e n v i r o n m e n t a l and a n d fire f i r e behaviour b e h a v i o u r classes c l a s s e s shall s h a l l be b e selected s e l e c t e d according a c c o r d i n g to t o Table T a b l e 2 2 below b e l o w unless u n l e s s otherwise o t h e r w i s e agreed a g r e e d in i n e.g. e . g . datasheet. d a t a s h e e t . Table T a b l e 2 2 Requirement R e q u i r e m e n t for f o r climatic, c l i m a t i c , environmental e n v i r o n m e n t a l and a n d fire f i r e behaviour b e h a v i o u r classes c l a s s e s Climatic C l i m a t i c C1 C 1 Environmental E n v i r o n m e n t a l E1 E 1 Fire F i r e F1 F 1 The T h e transformer t r a n s f o r m e r is i s suitable s u i t a b l e for f o r operation o p e r a t i o n at a t ambient a m b i e n t temperature t e m p e r a t u r e not n o t below b e l o w -5°C - 5 ° C but b u t may m a y be b e exposed e x p o s e d during d u r i n g transport t r a n s p o r t and a n d storage s t o r a g e to t o ambient a m b i e n t temperatures t e m p e r a t u r e s down d o w n to t o -25°C. - 2 5 ° C . Occasional O c c a s i o n a l condensation c o n d e n s a t i o n can c a n occur o c c u r on o n the t h e transformer t r a n s f o r m e r (for ( f o r example, e x a m p l e , when w h e n the t h e transformer t r a n s f o r m e r is i s de- d e - energised). e n e r g i s e d ) . Limited L i m i t e d pollution p o l l u t i o n is i s possible. p o s s i b l e . Transformers T r a n s f o r m e r s subject s u b j e c t to t o a a fire f i r e hazard. h a z a r d . Restricted R e s t r i c t e d flammability f l a m m a b i l i t y is i s required. r e q u i r e d . The T h e emission e m i s s i o n of o f toxic t o x i c substances s u b s t a n c e s and a n d opaque o p a q u e smokes s m o k e s shall s h a l l be b e minimized. m i n i m i z e d . For F o r transformers t r a n s f o r m e r s based b a s e d on o n IEC I E C standards s t a n d a r d s further f u r t h e r information i n f o r m a t i o n can c a n be b e found f o u n d in i n section s e c t i o n 13 1 3 of o f IEC I E C 60076-11. 6 0 0 7 6 - 1 1 . Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 19 1 9 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l 4.7 4 . 7 Control C o n t r o l and a n d monitoring m o n i t o r i n g SR-48013 S R - 4 8 0 1 3 - - The T h e following f o l l o w i n g instrumentations i n s t r u m e n t a t i o n s shall s h a l l be b e provided p r o v i d e d as a s a a minimum: m i n i m u m : Winding W i n d i n g temperatures t e m p e r a t u r e s enabling e n a b l i n g local l o c a l and a n d remote r e m o t e reading. r e a d i n g . Temperatures T e m p e r a t u r e s shall s h a l l be b e measured m e a s u r e d on o n the t h e windings, w i n d i n g s , two t w o measuring m e a s u r i n g point p o i n t per p e r phase. p h a s e . The T h e sensors s e n s o r s shall s h a l l be b e located l o c a t e d where w h e r e hot h o t spot s p o t temperatures t e m p e r a t u r e s are a r e anticipated. a n t i c i p a t e d . There T h e r e shall s h a l l be b e two t w o sets s e t s of o f contacts. c o n t a c t s . One O n e for f o r the t h e alarm a l a r m circuit c i r c u i t and a n d one o n e for f o r the t h e trip t r i p circuit. c i r c u i t . 4.8 4 . 8 Testing T e s t i n g SR-48015 S R - 4 8 0 1 5 - - Routine R o u t i n e testing t e s t i n g shall s h a l l be b e in i n accordance a c c o r d a n c e with w i t h IEC I E C 60076-11 6 0 0 7 6 - 1 1 or o r IEEE I E E E C57.12.01 C 5 7 . 1 2 . 0 1 and a n d IEEE I E E E C57.12.91 C 5 7 . 1 2 . 9 1 respectively. r e s p e c t i v e l y . SR-48016 S R - 4 8 0 1 6 - - The T h e following f o l l o w i n g non-routine n o n - r o u t i n e tests t e s t s shall s h a l l always a l w a y s be b e performed p e r f o r m e d (ref ( r e f IEC I E C 60076-11 6 0 0 7 6 - 1 1 or o r IEEE I E E E C57.12.01 C 5 7 . 1 2 . 0 1 and a n d IEEE I E E E C57.12.91 C 5 7 . 1 2 . 9 1 respectively): r e s p e c t i v e l y ) : Temperature-rise T e m p e r a t u r e - r i s e test t e s t together t o g e t h e r with w i t h the t h e planned p l a n n e d protective p r o t e c t i v e housing h o u s i n g unless u n l e s s otherwise o t h e r w i s e agreed a g r e e d upon. u p o n . Partial P a r t i a l discharge d i s c h a r g e measurement m e a s u r e m e n t special s p e c i a l test. t e s t . Determination D e t e r m i n a t i o n of o f capacitances c a p a c i t a n c e s windings-to-earth w i n d i n g s - t o - e a r t h and a n d between b e t w e e n windings w i n d i n g s for f o r all a l l converter c o n v e r t e r transformers. t r a n s f o r m e r s . SR-48017 S R - 4 8 0 1 7 - - If I f several s e v e r a l identical i d e n t i c a l transformers t r a n s f o r m e r s are a r e ordered, o r d e r e d , the t h e non-routine n o n - r o u t i n e test t e s t should s h o u l d be b e performed p e r f o r m e d on o n one o n e transformer t r a n s f o r m e r only. o n l y . 5 5 Additional A d d i t i o n a l information i n f o r m a t i o n 5.1 5 . 1 Definitions D e f i n i t i o n s and a n d abbreviations a b b r e v i a t i o n s Shall S h a l l (requirement) ( r e q u i r e m e n t ) Requirement R e q u i r e m e n t strictly s t r i c t l y to t o be b e followed f o l l o w e d in i n order o r d e r to t o confirm c o n f i r m to t o the t h e document d o c u m e n t and a n d from f r o m which w h i c h no n o deviation d e v i a t i o n is i s permitted, p e r m i t t e d , unless u n l e s s a a deviation d e v i a t i o n permit p e r m i t is i s approved. a p p r o v e d . Should S h o u l d (recommendation) ( r e c o m m e n d a t i o n ) Indicates I n d i c a t e s that t h a t among a m o n g several s e v e r a l possibilities p o s s i b i l i t i e s one o n e is i s recommended r e c o m m e n d e d as a s particularly p a r t i c u l a r l y suitable, s u i t a b l e , without w i t h o u t mentioning m e n t i o n i n g or o r excluding e x c l u d i n g others, o t h e r s , or o r that t h a t a a certain c e r t a i n course c o u r s e of o f action a c t i o n is i s Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 20 2 0 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l preferred p r e f e r r e d but b u t not n o t necessarily n e c e s s a r i l y required, r e q u i r e d , or o r that t h a t (in ( i n the t h e negative n e g a t i v e form) f o r m ) possibility p o s s i b i l i t y or o r course c o u r s e of o f action a c t i o n is i s deprecated d e p r e c a t e d but b u t not n o t prohibited. p r o h i b i t e d . May M a y Indicates I n d i c a t e s a a course c o u r s e of o f action a c t i o n permissible p e r m i s s i b l e within w i t h i n the t h e limits l i m i t s of o f the t h e document. d o c u m e n t . Can C a n Statements S t a t e m e n t s of o f possibility p o s s i b i l i t y and a n d capability, c a p a b i l i t y , whether w h e t h e r material, m a t e r i a l , physical p h y s i c a l or o r causal. c a u s a l . AC A C Alternating A l t e r n a t i n g current c u r r e n t AF A F Air A i r Forced F o r c e d AN A N Air A i r Natural N a t u r a l Converter C o n v e r t e r transformer t r a n s f o r m e r Transformer T r a n s f o r m e r feeding f e e d i n g a a converter c o n v e r t e r load l o a d CT C T Current C u r r e n t Transformer T r a n s f o r m e r DEH D E H Direct D i r e c t Electric E l e c t r i c Heating H e a t i n g IP I P Ingress I n g r e s s Protection P r o t e c t i o n NER N E R Neutral N e u t r a l Earth E a r t h Resistor R e s i s t o r OCTC O C T C Off O f f Circuit C i r c u i t Tap T a p Changer C h a n g e r OFWF O F W F Oil O i l Forced F o r c e d Water W a t e r Forced F o r c e d OLTC O L T C On O n Load L o a d Tap T a p Changer C h a n g e r ONAF O N A F Oil O i l Natural N a t u r a l Air A i r Forced F o r c e d ONAN O N A N Oil O i l Natural N a t u r a l Air A i r Natural N a t u r a l U U m m VPI V P I Highest H i g h e s t voltage v o l t a g e for f o r equipment e q u i p m e n t Vacuum V a c u u m Pressure P r e s s u r e Impregnation I m p r e g n a t i o n 5.2 5 . 2 Changes C h a n g e s from f r o m previous p r e v i o u s version v e r s i o n Changes C h a n g e s in i n version v e r s i o n 3.02: 3 . 0 2 : Document D o c u m e n t updated u p d a t e d from f r o m template t e m p l a t e to t o template. t e m p l a t e . Wording W o r d i n g "" " " changed c h a n g e d to t o "". " " . Insignificant I n s i g n i f i c a n t changes, c h a n g e s , performed p e r f o r m e d by b y system s y s t e m administrator, a d m i n i s t r a t o r , on o n behalf b e h a l f of o f author/owner. a u t h o r / o w n e r . Changes C h a n g e s in i n version v e r s i o n 3.01: 3 . 0 1 : Published P u b l i s h e d in i n new n e w minor m i n o r version v e r s i o n as a s part p a r t of o f the t h e GEM-project G E M - p r o j e c t (Governing ( G o v e r n i n g Element E l e m e n t Management). M a n a g e m e n t ) . TR-document T R - d o c u m e n t is i s digitalized, d i g i t a l i z e d , and a n d each e a c h requirement r e q u i r e m e n t element e l e m e n t is i s now n o w identified i d e n t i f i e d with w i t h a a unique u n i q u e ID. I D . Changes C h a n g e s in i n version v e r s i o n 3: 3 : Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 21 2 1 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l General: G e n e r a l : Editorial E d i t o r i a l changes, c h a n g e s , updated u p d a t e d IEC I E C / / IEEE I E E E references r e f e r e n c e s and a n d added a d d e d references r e f e r e n c e s to t o TR3120 T R 3 1 2 0 Section S e c t i o n 2.1: 2 . 1 : Deleted D e l e t e d requirements r e q u i r e m e n t s for f o r base b a s e case c a s e transformers t r a n s f o r m e r s Section S e c t i o n 2.3: 2 . 3 : Deleted D e l e t e d requirement r e q u i r e m e n t for f o r uniform u n i f o r m winding w i n d i n g insulation i n s u l a t i o n and a n d included i n c l u d e d reference r e f e r e n c e to t o IEC I E C 61378-1 6 1 3 7 8 - 1 Section S e c t i o n 2.5: 2 . 5 : Removed R e m o v e d requirement r e q u i r e m e n t for f o r 110 1 1 0 % % core c o r e dimensioning d i m e n s i o n i n g is i s required r e q u i r e d for f o r all a l l type t y p e of o f transformers t r a n s f o r m e r s Section S e c t i o n 2.9: 2 . 9 : Non-technical N o n - t e c h n i c a l information i n f o r m a t i o n removed r e m o v e d Section S e c t i o n 2.11: 2 . 1 1 : New N e w section s e c t i o n added a d d e d for f o r vibration v i b r a t i o n dampers d a m p e r s Section S e c t i o n 3.6: 3 . 6 : Updated U p d a t e d text t e x t and a n d that t h a t bushing b u s h i n g type t y p e will w i l l be b e described d e s c r i b e d in i n datasheet d a t a s h e e t Section S e c t i o n 3.7: 3 . 7 : Removed R e m o v e d requirement r e q u i r e m e n t for f o r CT C T for f o r thermal t h e r m a l image i m a g e Section S e c t i o n 4.3: 4 . 3 : The T h e transformer t r a n s f o r m e r core c o r e shall s h a l l be b e dimensioned d i m e n s i o n e d for f o r continuous c o n t i n u o u s operation o p e r a t i o n at a t 110 1 1 0 % % of o f rated r a t e d voltage v o l t a g e referred r e f e r r e d to t o the t h e principal p r i n c i p a l tapping t a p p i n g and a n d rated r a t e d power. p o w e r . Section S e c t i o n 4.6: 4 . 6 : Fire F i r e class c l a s s updated u p d a t e d from f r o m F0 F 0 to t o F1 F 1 5.3 5 . 3 References R e f e r e n c e s The T h e documents d o c u m e n t s listed l i s t e d below b e l o w include i n c l u d e provisions p r o v i s i o n s and a n d guidelines g u i d e l i n e s which, w h i c h , through t h r o u g h reference r e f e r e n c e in i n this t h i s specification, s p e c i f i c a t i o n , constitute c o n s t i t u t e provisions p r o v i s i o n s and a n d guidelines g u i d e l i n e s of o f this t h i s specification. s p e c i f i c a t i o n . SR-48025 S R - 4 8 0 2 5 - - Latest L a t e s t issue i s s u e of o f the t h e referred r e f e r r e d document d o c u m e n t shall s h a l l be b e used u s e d unless u n l e s s otherwise o t h e r w i s e agreed. a g r e e d . Other O t h e r recognized r e c o g n i z e d standards s t a n d a r d s may m a y be b e used u s e d provided p r o v i d e d it i t can c a n be b e shown s h o w n that t h a t they t h e y meet m e e t or o r exceed e x c e e d the t h e requirements r e q u i r e m e n t s and a n d guidelines g u i d e l i n e s of o f the t h e standards s t a n d a r d s referenced r e f e r e n c e d below. b e l o w . Note N o t e that t h a t references r e f e r e n c e s in i n this t h i s specification s p e c i f i c a t i o n (e.g. ( e . g . references r e f e r e n c e s to t o clause c l a u s e numbers n u m b e r s in i n standards) s t a n d a r d s ) are a r e based b a s e d on o n year y e a r of o f issue i s s u e as a s listed l i s t e d below. b e l o w . Table T a b l e 3: 3 : Standards S t a n d a r d s that t h a t are a r e the t h e basis b a s i s for f o r transformer t r a n s f o r m e r specification s p e c i f i c a t i o n IEC I E C IEEE I E E E IEC I E C 2011 2 0 1 1 Power P o w e r transformers, t r a n s f o r m e r s , Part P a r t IEEE I E E E 2010 2 0 1 0 General G e n e r a l Requirements R e q u i r e m e n t s for f o r 60076-1 6 0 0 7 6 - 1 1: 1 : General G e n e r a l C57.12.00 C 5 7 . 1 2 . 0 0 Liquid-Immersed L i q u i d - I m m e r s e d Distribution, D i s t r i b u t i o n , Power, P o w e r , and a n d Regulating R e g u l a t i n g IEEE I E E E 2010 2 0 1 0 Transformers T r a n s f o r m e r s C57.12.90 C 5 7 . 1 2 . 9 0 Test T e s t Code C o d e for f o r Liquid-Immersed L i q u i d - I m m e r s e d Distribution, D i s t r i b u t i o n , Power, P o w e r , and a n d Regulating R e g u l a t i n g Transformers T r a n s f o r m e r s Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 22 2 2 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l IEC I E C 2011 2 0 1 1 Power P o w e r transformers, t r a n s f o r m e r s , Part P a r t IEEE I E E E 2010 2 0 1 0 General G e n e r a l Requirements R e q u i r e m e n t s for f o r 60076-2 6 0 0 7 6 - 2 2: 2 : Temperature T e m p e r a t u r e rise r i s e C57.12.00 C 5 7 . 1 2 . 0 0 Liquid-Immersed L i q u i d - I m m e r s e d Distribution, D i s t r i b u t i o n , Power, P o w e r , and a n d Regulating R e g u l a t i n g Transformers T r a n s f o r m e r s IEC I E C 2013 2 0 1 3 Power P o w e r transformers, t r a n s f o r m e r s , Part P a r t IEEE I E E E 2010 2 0 1 0 General G e n e r a l Requirements R e q u i r e m e n t s for f o r 60076-3 6 0 0 7 6 - 3 3: 3 : Insulation I n s u l a t i o n levels, l e v e l s , C57.12.00 C 5 7 . 1 2 . 0 0 Liquid-Immersed L i q u i d - I m m e r s e d Distribution, D i s t r i b u t i o n , dielectric d i e l e c t r i c tests t e s t s and a n d Power, P o w e r , and a n d Regulating R e g u l a t i n g external e x t e r n a l clearances c l e a r a n c e s in i n air a i r Transformers T r a n s f o r m e r s IEC I E C 2006 2 0 0 6 Power P o w e r transformers, t r a n s f o r m e r s , Part P a r t IEEE I E E E 2010 2 0 1 0 General G e n e r a l Requirements R e q u i r e m e n t s for f o r 60076-5 6 0 0 7 6 - 5 5: 5 : Ability A b i l i t y to t o withstand w i t h s t a n d C57.12.00 C 5 7 . 1 2 . 0 0 Liquid-Immersed L i q u i d - I m m e r s e d Distribution, D i s t r i b u t i o n , short s h o r t circuit c i r c u i t Power, P o w e r , and a n d Regulating R e g u l a t i n g Transformers T r a n s f o r m e r s IEC I E C 2005 2 0 0 5 Power P o w e r transformers, t r a n s f o r m e r s , Part P a r t IEEE I E E E 2010 2 0 1 0 General G e n e r a l Requirements R e q u i r e m e n t s for f o r 60076-7 6 0 0 7 6 - 7 7: 7 : Loading L o a d i n g guide g u i d e for f o r oil- o i l - C57.12.00 C 5 7 . 1 2 . 0 0 Liquid-Immersed L i q u i d - I m m e r s e d Distribution, D i s t r i b u t i o n , immersed i m m e r s e d power p o w e r Power, P o w e r , and a n d Regulating R e g u l a t i n g transformers t r a n s f o r m e r s Transformers T r a n s f o r m e r s IEC I E C 2005 2 0 0 5 Power P o w e r transformers, t r a n s f o r m e r s , Part P a r t IEEE I E E E 2010 2 0 1 0 Test T e s t Code C o d e for f o r Liquid-Immersed L i q u i d - I m m e r s e d 60076-10 6 0 0 7 6 - 1 0 10: 1 0 : Determination D e t e r m i n a t i o n of o f C57.12.90 C 5 7 . 1 2 . 9 0 Distribution, D i s t r i b u t i o n , Power, P o w e r , and a n d sound s o u n d levels l e v e l s Regulating R e g u l a t i n g Transformers T r a n s f o r m e r s IEEE I E E E 2011 2 0 1 1 C57.12.91 C 5 7 . 1 2 . 9 1 Test T e s t Code C o d e for f o r Dry-Type D r y - T y p e Distribution D i s t r i b u t i o n and a n d Power P o w e r Transformers T r a n s f o r m e r s IEC I E C 2004 2 0 0 4 Power P o w e r transformers, t r a n s f o r m e r s , Part P a r t IEEE I E E E 2005 2 0 0 5 General G e n e r a l Requirements R e q u i r e m e n t s for f o r Dry- D r y - 60076-11 6 0 0 7 6 - 1 1 11: 1 1 : Dry-type D r y - t y p e transformers t r a n s f o r m e r s C57.12.01 C 5 7 . 1 2 . 0 1 Type T y p e Distribution D i s t r i b u t i o n and a n d Power P o w e r Transformers, T r a n s f o r m e r s , Including I n c l u d i n g Those T h o s e with w i t h Solid-Cast S o l i d - 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C57.12.91 C 5 7 . 1 2 . 9 1 Test T e s t Code C o d e for f o r Dry-Type D r y - T y p e Distribution D i s t r i b u t i o n and a n d Power P o w e r Transformers T r a n s f o r m e r s IEC I E C 2008 2 0 0 8 Power P o w e r transformers, t r a n s f o r m e r s , Part P a r t IEEE I E E E 2005 2 0 0 5 General G e n e r a l Requirements R e q u i r e m e n t s for f o r Dry- D r y - 60076-12 6 0 0 7 6 - 1 2 12: 1 2 : Loading L o a d i n g guide g u i d e for f o r dry- d r y - C57.12.01 C 5 7 . 1 2 . 0 1 Type T y p e Distribution D i s t r i b u t i o n and a n d Power P o w e r type t y p e power p o w e r transformers t r a n s f o r m e r s Transformers, T r a n s f o r m e r s , Including I n c l u d i n g Those T h o s e with w i t h Solid-Cast S o l i d - C a s t and/or a n d / o r Resin R e s i n Encapsulated E n c a p s u l a t e d Windings W i n d i n g s IEC I E C 2013 2 0 1 3 Power P o w e r transformers, t r a n s f o r m e r s , Part P a r t IEEE I E E E 1276 1 2 7 6 2000 2 0 0 0 IEEE I E E E Guide G u i d e for f o r the t h e application a p p l i c a t i o n Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 23 2 3 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 granularity=word tetml={elements={line} glyphdetails={all}} contentanalysis={punctuationbreaks=false dehyphenate=false shadowdetect=false} layoutanalysis={tabledetect=0 layoutdetect=3} structureanalysis={list=true} Requirements: R e q u i r e m e n t s : Transformers T r a n s f o r m e r s Classification: C l a s s i f i c a t i o n : Internal I n t e r n a l 60076-14 6 0 0 7 6 - 1 4 14: 1 4 : Design D e s i g n and a n d application a p p l i c a t i o n of o f liquid-immersed l i q u i d - i m m e r s e d power p o w e r transformers t r a n s f o r m e r s using u s i n g high- h i g h - temperature t e m p e r a t u r e insulation i n s u l a t i o n materials m a t e r i a l s IEC I E C 2003 2 0 0 3 Tap-changers, T a p - c h a n g e r s , Part P a r t 1: 1 : 60214-1 6 0 2 1 4 - 1 Performance P e r f o r m a n c e requirements r e q u i r e m e n t s and a n d test t e s t methods m e t h o d s IEC I E C 2011 2 0 1 1 Converter C o n v e r t e r Transformers, T r a n s f o r m e r s , 61378-1 6 1 3 7 8 - 1 Part P a r t 1: 1 : Transformers T r a n s f o r m e r s for f o r industrial i n d u s t r i a l applications a p p l i c a t i o n s IEC I E C 60137 6 0 1 3 7 2008 2 0 0 8 Insulated I n s u l a t e d bushings b u s h i n g s for f o r alternating a l t e r n a t i n g voltages v o l t a g e s above a b o v e 1000 1 0 0 0 V V IEEE I E E E C57.131 C 5 7 . 1 3 1 IEEE I E E E C57.18.10 C 5 7 . 1 8 . 1 0 IEEE I E E E C57.19.00 C 5 7 . 1 9 . 0 0 of o f High-Temperature H i g h - 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2 Part P a r t 2: 2 : Additional A d d i t i o n a l requirements r e q u i r e m e n t s for f o r current c u r r e n t transformers t r a n s f o r m e r s IEC I E C 2011 2 0 1 1 Power P o w e r transformers, t r a n s f o r m e r s , Part P a r t 60076-16 6 0 0 7 6 - 1 6 16: 1 6 : Transformers T r a n s f o r m e r s for f o r wind w i n d turbine t u r b i n e applications a p p l i c a t i o n s IEEE I E E E C57.106 C 5 7 . 1 0 6 2006 2 0 0 6 Guide G u i d e for f o r Acceptance A c c e p t a n c e and a n d Maintenance M a i n t e n a n c e of o f Insulating I n s u l a t i n g Oil O i l in i n Equipment E q u i p m e n t IEEE I E E E C57.13 C 5 7 . 1 3 2008 2 0 0 8 Requirements R e q u i r e m e n t s for f o r Instrument I n s t r u m e n t Transformers T r a n s f o r m e r s NA N A NA N A NA N A Table T a b l e 4: 4 : Other O t h e r technical t e c h n i c a l requirements r e q u i r e m e n t s TR0041 T R 0 0 4 1 Plate P l a t e and a n d Frame F r a m e Heat H e a t Exchangers E x c h a n g e r s TR0042 T R 0 0 4 2 Surface S u r f a c e preparation p r e p a r a t i o n and a n d protective p r o t e c t i v e coating c o a t i n g TR2000 T R 2 0 0 0 Piping P i p i n g and a n d Valve V a l v e spec. s p e c . TR3120 T R 3 1 2 0 Electrical E l e c t r i c a l equipment, e q u i p m e n t , general g e n e r a l requirements r e q u i r e m e n t s Project P r o j e c t development, d e v e l o p m e n t , Requirements, R e q u i r e m e n t s , TR3123, T R 3 1 2 3 , Version V e r s i o n 3.02 3 . 0 2 Page P a g e 24 2 4 of o f 24 2 4 Printed: P r i n t e d : 15/05/2023 1 5 / 0 5 / 2 0 2 3 14:42:48 1 4 : 4 2 : 4 8 0.00 0.00 0.00 0.01 0.47 0.73 0.01 0.47 0.73 0.50 0.50 0.50 0.50 0.50 0.50