绝缘子人工污秽闪络电压变异系数的统计分析

掌握绝缘子污闪试验数据的分散性对于绝缘子选择和设计具有重要意义。对同一污秽条件下、同一绝缘子污闪电压的变异系数及置信上限进行了统计分析;对不同污秽条件下、不同绝缘子的污闪电压变异系数的分布规律及统计量进行了分析。结果表明:采用均匀升压法得到的绝缘子污闪电压变异系数置信上限的最大值为0.130;采用均匀升压法得到的绝缘子污秽闪络电压的变异系数近似服从正态分布,期望值为5.32%,其95%置信区间的上限为5.61%,与采用升降法得到的污秽闪络电压变异系数的期望值基本一致。

Statistical Analysis on Variation Coefficient for Artificial Pollution Flashover Voltage of Insulators

It is of great significance to master the data dispersity in the pollution flashover test of insulators.This paper performs the analysis on the variation coefficient of pollution flashover voltages for the same insulators and the upper confidence limit statistically under the same pollution conditions as well as the distribution rules and the statistics of variation coefficient of pollution flashover voltages for different insulators under different pollution conditions.The results show that the upper confidence limits,which are obtained with the step-up method,have a maximum of 0.130,and the variation coefficients have an approximate normal distribution with the mathematical expectation of 5.32%,and its upper confidence limit is 5.61% in 95% of confidence interval,which is consistent with the results obtained with up-and-down method.