绝缘子泄漏电流与脉冲电流特性研究

Research on the Characteristic of Insulator Leakage Current and Pulse Current

基于大量人工污秽试验,详细研究了外施电压下绝缘子泄漏电流与盐密、灰密、温度及湿度的关系。利用脉冲电流法检测系统对不同绝缘子在不同电压下的脉冲电流特性进行了研究。介绍了脉冲电流法检测系统的组成,对试品绝缘子的脉冲电流特性进行了研究,实验结果表明:绝缘子局放脉冲能量主要出现在工频相位的60～120°和240～300°之间。随着绝缘子劣化程度的加深,脉冲电流的幅值、脉冲个数和产生相位的范围都增大。

Based on the results of a large numbers of artificial contamination experimentation, the interaction of leakage current （under running voltage） and ESDD, NSDD, relative humidity, temperature is analyzed in detail. On-line detection for different insulators based on pulse current method is studied. The constituent parts and the realization of the detecting system are introduced. In laboratory, the partial discharge pulse current characteristics of the composite insulators have been studied. The results indicate that partial discharge pulses mainly occur between 60-120° and 240-300° in power frequency phase. The amplitude of pulse current, the number of the impulse and the phase scope where occurs increase along with the development of the insulator deterioration.