JLSZW-10 three-phase outdoor dry high-voltage eletric measuring tank(combined inductor)is made up of two or three single-phase voltage mutual-inductors(PT) and current mutual-inductor(CT).PT AND CT are both electromagnetic type. this type of inductor is applicable to 50HZ(rated frequency),three-phase AC,6v,10v(rated voltage)electric net for power measuring.It is fixed on the high-voltage side of power supply mutual inductor.there is one active watt-hour and one reactive watt-hour meter installed inside meter tank,which are used to directly measure active and reactive eletric appliance equipment in high-voltage circuits.