简答题The following devices that do not belong to primary devices are () A、Lightning arrester B、 Current meter C、Voltmeter D、 button简答题The following devices that are not primary devices are ( ). A、Shunt reactor B、Grounding device C、 Silicon rectifier D、transformer简答题The equipment that controls, protects, measures and supervises the primary equipment is called ( ). A、Monitoring equipment B、Secondary equipment C、Auxiliary equipment D、 The main equipment简答题The following are primary devices (). A、Lightning arrester B、 Insulator C、 Control switch D、 Arc suppression coil简答题Ac ultra high voltage refers to the voltage levels ( ) and above. A、500kV B、330kV C、1000kV D、750kV简答题220kV substation in power system must be hub substation. A、正确 B、错误简答题A circuit formed by sequential connections of secondary devices, called (). A、Electrical wiring B、 The main wiring C、 Primary wiring D、 The secondary loop简答题High voltage equipment refers to ( ) and above electrical equipment. A、1kV B、10kV C、35kV D、110kV简答题Secondary equipment is to undertake low voltage, high current equipment. A、正确 B、错误简答题Ac UHV refers to voltage levels ( ) and above. A、500kV B、330kV C、1000kV D、750kV