1996CSN 35 1121-1996 Three-phas? .oil-immersed distribution transformers 50 Hz, from 50 to 2500 kVA with highest voltage for equipment not excee- ding 36 kV. Part 1: General requirements and requirements for transformers with highest voltage for equipment not exceeding 24 kV
1988CSN 35 1121-1988 Three phase oil power trnasformers 100 to 1600 kV . A, to 22 kV. Technica] requirements and basic parametres