Recommended Practice for Partial Discharge Measurements under AC Voltage with VHF/UHF Sensors during Routine Tests on Factory and Pre-Molded Joints of HVDC Extruded Cable Systems up to 800 kV 在高达800 kV的高压直流挤压电缆系统的工厂和预成型接头的常规试验中,使用甚高频/超高频传感器在交流电压下进行局部放电测量的推荐操作规程