三相电压互感器Y/y0接线，接入一只三相四线电能表，当二次侧c相断线，Uab=（）V,Ubc=（）V。 The three-phase voltage transformer Y/y0 is connected to a three-phase four wire electric energy meter. When phase c at the secondary side is disconnected, Uab=( ) V, Ubc=( ) V.
A、0
B、50
C、57.7
D、100
发布时间：2025-04-17 07:43:57
