悬式瓷制绝缘子泄漏电流与表面污秽的关系

为研究泄漏电流与相对空气湿度和污秽度的关系,以人工雾室内的大量人工污秽试验为依据,试验研究了瓷制绝缘子表面泄漏电流随相对空气湿度及污秽程度的逐步提升而不断增长的规律。结果表明,泄漏电流同空气相对湿度和污秽度之间存在着非线性关系;随着相对空气湿度和绝缘子表面污秽度的增加,表面放电现象明显加剧,泄漏电流随之增大,泄漏电流中3次谐波占基波比例也随之增加;湿度达到≥55%时,泄漏电流增幅明显。

Relation Between Leakage Current and Surface Contamination of Suspension Porcelain Insulators

In order to study the relations among the leakage current(LC),relative humidity and the pollution degree,the continuous increasing rule of the LC of the porcelain insulator surface with the increasing relative humidity and contamination is described based on a large number of data obtained from tests carried out in the artificial fog chamber.Results show that the LC has nonlinear relations with the relative humidity and the pollution degree.With the increment of the relative humidity and pollution degree,surface discharge phenomenon changes apparently,the LC is increasing,and the ratio of the triple-harmonic in first-harmonic of the LC is also rising.The increased amplitude of leakage current varies obviously when the relative humidity exceeds 55%.