IEC 61639 Direct connection between power transfor
额定电压72.5kV及以上电力变压器与气体绝缘金属封闭开关设备的直接连接
Direct connection between power transformers and gas-insulated metal-enclosed switchgear for rated voltages of 72,5 kV and above
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Direct connection between power transformers and gas-insulated metal-enclosed switchgear for rated voltages of 72,5 kV and above