如图所示电路,在闭合开关S时为对称三相电路,且三个电流表的读数均为30A,Z=10-j10Ω,闭合开关S时,三个负载Z的总无功功率为( )。
发布时间:2024-12-08
A.-9kVar
B.9kVar
C.150kVar
D.-150kVar
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