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In resonant ground systems, both asymmetric fault of high-voltage side and asymmetry of load cause the asymmetry of system electrical source voltage. Then they change neutral displacement voltage.
在谐振接地系统中，系统高压侧不对称故障及负荷的不对称会引起系统电源电势的不对称，从而改变中性点位移电压。
As we need only electrical power for FET switching on the carrier side, power supply system for carrier is basically not needed.
只有载体侧FET(场效应晶体管)开关需要电源，载体本身基本上不需要电源。
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