电压互感器二次回路接地点分析

Analysis of voltage transformer secondary circuit grounding point

电压互感器二次回路必须有一点接地,其原因是为了保证人身和二次设备的安全。电压互感器二次回路接地点位置的选取,对于电压二次数值的正确测量,有着重要的影响。根据"十八项反措"要求和现场工作实际分析指出电压互感器二次绕组接地点和三次绕组接地点选择错误的危害,提出了电压互感器二次接地点位置选择的方法,阐述了合理选择接地点的重要性。通过介绍,望引起各兄弟单位对电压互感器二次回路接地点位置选择的重视。

It is necessary of grounding in the voltage transformer secondary circuit to guarantee the person and secondary equipment safety. The voltage transformer secondary circuit grounding point position selection, regarding the voltage two values correct surveys, has the important influence. This paper, according to “18 items counter-measures” the request and the field work actual analysis, points out harm of wrong selection in the voltage transformer secondary winding grounding point and tertiary winding grounding point, proposes selection method of the voltage transformer two grounding point, and elaborates the importance. It is necessary to pay more attention to the choice of PT secondary circuit grounding.