在干扰环境中测量局部放电的新原理——调谐平衡法

The New Principle of Partial Discharge Measurement in Interference Environment Tuned Balance Method Electrical Insulation Institute,Faculty of Electrical Engineering, Xian Jiaotong University,(Xian 710049)

传统的局部放电平衡测量法以电阻电容为输入电路，存在许多缺点，难以在高压和超高压领域推广使用。本文以电感电容为输入电路；全面分析了调谐平衡法局部放电测试原理；模拟实验的结果表明，在选定的测量中心频率下，在调谐电容的调节范围内，存在着无数组平衡点，试样与参考电容器的电容量可相差１００倍，干扰的抑制比可高达２０００～４０００。

Input circuit of traditional balance method for partial discharge (PD) measurement is a parallel circuit of resistance and capacitance. There are many defects with this measuring circuit and it is difficult to spread it’s use in HV and UHV domain. The measurement principle of tuned balance method with input circuit of inductance and capacitance for PD detection is analysised in detail in this paper. It is shown by simulated test that under the fixed center frequency of measurement,the innumerable balance points exist in adjustable range of tuned capacitors,and the capacitance proportion of sample to reference capacitor can reach to 100,and the inhibitory ratio of interference is up to 2000-4000.