电流互感器局部放电试验干扰的分析与抑制

Interference Suppression in Partial Discharge Experiments of Current Transformer

电流互感器的可靠性影响到整个电网的安全运行,而电流互感器运行的可靠性,在很大程度上取决于其绝缘的可靠性,局部放电试验是检测电流互感器绝缘状况的重要手段。笔者详细分析了电流互感器局部放电的检测方法-脉冲电流法,以及局部放电检测的试验回路。针对局部放电检测易受干扰的情况,实测了现场各种干扰信号的图谱,通过对干扰图谱特点的分析,判别出干扰信号的来源,并采取相应的措施抑制干扰。

The reliability of a current transformer affects the safe operation of a power grid, which highly depends on its dielectric performance. Partial discharge detection is a very important method for the evaluation of dielectric performance of a current transformer. In this paper, the pulse current method for detecting partial discharge （PD） is analyzed, and the PD test circuit was discussed. Because PD detection is easily disturbed, different kinds of interference signals are detected for investigating their characteristics, finding out the sources of the signals, and hence taking special measures to suppress the interference signals.