The principle and structure of the resonance-proof three phase voltage transformer used in the neutral insulation system are discussed. The connection errors brought about in operation are presented.
论述了中性点绝缘系统中采用的三相防谐振电压互感器的原理与结构，并指出了运行中容易发生的接线错误。
2
In both of the cases above, the shift voltage of neutral point often appears. So one does not differ from the other easily, especially for the fundamental frequency ferro-resonance.