无分压抽头电容式电压互感器(CVT)的整体试验

Integrated test of CVT without voltage dividing tap

电容式电压互感器(CVT)大致分为带有分压抽头和无分压抽头两种方式,对于带有分压抽头CVT的试验,通常可以采用常规正接线,测量分压电容C1和C2的介质损耗值和电容量,对于无分压抽头的电容式电压互感器的试验,由于试验中无法测量分压电容C1和C2的介质损耗值和电容量,只有进行整体测试,但易受电磁单元的干扰,文中就消除此干扰提出了新的试验方法。

CVTs（capacitor voltage transformers） are roughly classified into two types, one has the voltage divide tap and the other has not. The test on the former can be done by normal connecting and measuring the divided voltage capacity and dielectric loss, and for the latter, it is unable to. So the test of the CVT without tap has to be done integratedly, which is usually disturbed by electromagnetism. A new test method is proposed in this paper to eliminate the interference.