改进电磁耦合法在振荡波局部放电试验中的应用

振荡波测试系统因其能带动大容量试品的能力而被广泛应用到长电缆局部放电测试中。为有效提高振荡波测量系统的灵敏度,从理论角度分析传统脉冲电流法对长电缆测试的局限性,进而提出一种改进电磁耦合法用于振荡波局部放电测试。通过对测试回路注入不同电荷量的脉冲对比两种测量方式的测量精度,进而搭建振荡波测试平台,对两种方式下的测量信号特征进行分析。实验结果表明,改进电磁耦合法具有更高的灵敏度,并且受到较小的低频干扰。

The Application of Improved Electromagnetic Coupling Method in Partial Discharge Test Based on Oscillating Wave Voltage

An oscillation wave test system (OWTS) can carry high capacity load, and was generally used in long cables test. To improve the sensitivity of OWTS measurement system effectively, the limitations of typical impulse current detection method when used in long cables is analyzed theoretically, and an improved electromagnetic coupling method is present for OWTS. To compare the measure precision of two methods, different quantity of electric charge is applied in measure circuit. To analyze the characteristic of measurement signal in two method, partial discharge based on oscillating wave voltage is measured by using two methods. From the result, the improved electromagnetic coupling method has higher sensitivity, and more difficult to be interference by low frequency signal.