Three-phase oil-immersed distribution transformers 50 Hz, from 50 kVA to 2500 kVA with highest voltage for equipment not exceeding 36 kV - Part 4: Requirements and tests concerning pressurised corrugated tanks; German version EN 50464-4:2007/A1:2011
最高电压不超过36 kV的设备用50 Hz 50 kVA至2500 kVA的三相油浸式配电变压器.第4部分:关于加压波纹罐的要求和试验;德文版EN 50464-4:2007/A1:2011