人工污秽试验中绝缘子泄漏电流的统计特性

为了建立有效的污闪绝缘子在线监测系统,须确定合理的检测信号和检测方法。基于恒压净雾人工污秽试验数据,利用统计分析理论,分析了泄漏电流Ileak的特性,讨论了在人工污秽试验过程中,显著影响Ileak的因素,计算了各因素影响因子的大小,得到了电流的回归方程。结果表明,Ileak和环境相对湿度(RH)以及加湿持续时间关系密切,加湿时间和RH变化对Ileak影响严重;但Ileak和环境温度θ相关性很弱,θ主要是通过影响RH来间接影响Ileak。

Statistics Characteristics of Leakage Current on Artificial Contamination Test of Insulator

In order to build effective online monitoring method for contaminated insulators and prevent flashover from happening, the right measuring signal and method must be predetermined. In this paper, statistics characteristics of leakage current were studied basing on a large number of data obtained from artificial contamination test, the factors influencing leakage current significantly were found and a regression equation was established. The results indicate that leakage current has close relationship with RH (relative humidity) and RH persisting time length during test, these two factors affect the leakage current value obviously, while the relationship between leakage current and temperature is poor. Partial correlation result shows that temperature affects the leakage current Mainly through influencing RH indirectly. All these have practical significant for developing right online monitoring technology for insulator state recognition and establishing the flashover forecast system basing on LC analysis.