High-voltage switchgear and controlgear - Part 307: Guidance for the extension of validity of type tests of AC metal and solid-insulation enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV (IEC/TR 62271-307:2015)
高压开关设备和控制设备.第307部分:额定电压1kV以上52kV及以下交流金属和固体绝缘封闭开关设备和控制设备型式试验有效期延长指南(IEC/TR 62271-307-2015)