电容电桥法测量金属氧化物避雷器的阻性电流分量

介绍了一种新的金属氧化物避雷器(MOA)阻性电流分量的测量方法——电容电桥法,以电容电桥的电容器臂的电容电流作为补偿参考信号,来平衡、补偿MOA全泄漏电流中的容性电流成分,以得到流过MOA的阻性电流分量。实验结果表明,电容电桥的减法功能可以在很大程度上使MOA和泄漏电流上的谐波与电容器臂的电容电流上的谐波相抵消,且实现简单、易行,可以在实验室将波形显示在示波器上,并进行清晰地观察和对比。

Capacitance-bridge Method Used in Measuring the Resistive Leakage Currents of Metal-oxide Surge Arresters

This paper presented a new method,capacitance-bridge method,to measure the resistive leakage current of MOA.Using capacitance current as the compensation reference signal was the highlight of capacitance-bridge method.Experimental results show that the advantages of the method lie in,reduce the measuring influence caused by the harmonics greatly,simplify the measure of resistive leakage current,and make it possible to display the waveform on the oscillograph for observing and comparing.