一种根除小电流接地系统TV谐振的方法

揭示了电磁式电压互感器谐振的根本原因在于：为实现绝缘监视和接地检测功能，必须使用“YN，yn0，d11“结线的电压互感器，且将该电压互感器一次绕组中性点接地而形成“L-C”谐振电路的结果。提出了一种应用中性点不接地的电磁式电压互感器，该电压互感器仅向计量、保护装置提供线电压，而绝缘监视、接地保护所需相电压和零序电压则通过测量中性点接地的电容器组的相电流、零序电流进行转换的方法实现，经实践证明效果良好。

An Eradicating TV Resonance Method Applied in Small Current Grounding System

The fundamental cause of electromagnetic voltage transformer resonance is revealed as following: while voltage transformer has to work in" YN,yno,d11" mode and with primary winding neutral grounding in order to achieve insulation surveillance and grounding detection,thus a "L-C" resonant circuit is formed.This paper proposes to apply with non-neutral-grounding electromagnetic voltage transformer,which offers line voltage to measuring and protective devices.Phase voltage and zero sequence voltage for insulat...