3.28 中性点绝缘系统 (isolated neutral system) 除通过具有高阻抗的指示、测量仪表或保护装置接地外，无任何其他旨在接地连接的系 统。
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中性点绝缘的配电系统 distribution system insulated from earth
此情况在中性点绝缘系统中可通过消弧线圈或称彼得逊线圈加以克服。
This condition may be overcome in an isolated neutral system6 by means of an ARC suppression coil or Peterson Coil .
故可得出结论：在中性点绝缘系统中，因电磁式电压互感器饱和引起的过电压现象属于工频位移过电压。
Therefore, the over-voltage caused by the electromagnetic voltage transformer saturation in the system with insulated neutral belongs to shifting over-voltage.
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。
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.
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