Three-phase oil-immersed distribution transformers 50 Hz, from 50 kVA to 2 500 kVA with highest voltage for equipment not exceeding 36 kV - Part 1: General requirements
This document covers transformers from 50 kVA to 2 500 kVA intended for operation in three-phase distribution networks, for indoor or outdoor continuous service, 50 Hz, immersed in mineral oil, natural cooling, with two windings:- a primary (high-voltage) winding with a highest voltage for equipment from 3,6 kV to 36 kV;- a secondary (low-voltage) winding with a highest voltage for equipment not exceeding 1,1 kV.NOTE 1 This document may be applied, either as a whole or in part, to transformers immersed in a synthetic insulating liquid.NOTE 2 This document may be applied, either as whole or in part, to transformers having windings with more than one rated vo