Statistical Analysis of DC Leakage Current Data of Arrester in Guangzhou Power Grid

This article mainly analyzes the DC leakage current test data of 110–500 kV arrester, by using statistical analysis methods, it is obtained that it conforms to the Weibull distribution form. According to probability distribution statistic, the 95% quantile values of the leakage current of 110 kV, 220 kV, and 500 kV arrester are 31 uA, 30 uA, and 39 uA, respectively, it is proposed that the attention values can be 35 uA, 35 uA, and 45 uA. At the same time, the influence factors such as operating years, position, and humidity on the leakage current of arrester are analyzed, the results show that the average value and 95% quantile value show an overall increasing trend with the increase of operating years. For different position, the leakage current follows the pattern of upper section > middle section > lower section, and below 80% humidity, the influence of humidity on the leakage current is relatively small. This article provides a more accurate judgment for the evaluation of arrester status through data statistics.