关于高压绝缘子交流人工和自然污秽闪络电压的分散性

Dispersion of A.C. Artificial and Natural Pollution Flashover Voltage of High Voltage Insulators

调研了1980—1995年间在西安电瓷研究所污秽实验室进行的35～500 kV交流线路悬式和电站支柱绝缘子的人工和自然污秽闪络电压的分散性。该人工污秽试验按IEC 60507固体层法进行,自然污秽试验也按类似方法进行。经过对闪络电压变异系数的处理计算表明,按IEC60507的人工污秽闪络电压的变异系数均值约为5%,其双侧95%概率置信上限约为7.3%,自然污秽闪络电压的变异系数均值约为7.7%,其双侧95%概率置信上限约为11.3%。变异系数的计算结果均与国际上的结果能很好地吻合。

Dispersion of A.C.artificial and natural pollution flashover voltages of high-voltage line cap and pin insulators and substation post insulators to be used on 35-500 kV A.C. systems measured at Pollution Laboratory of Xi＇an Electro-ceramic Research Institute during 1980-1995 was investigated. The artificial pollution tests are performed according to the solid layer methods of IEC 60507, the natural pollution tests are performed also according to similar methods. The results of data analysis of flashover voltages coefficient of variation shows that average of variation coefficient of artificial pollution flashover voltages according to IEC 60507 approximates 5%, the upper limit of two sided confidence with 95% confidence level approximates 7.3%, the average of coefficient of variation of natural pollution flashover voltages approximates 7.7%, the two sided confidence upper limit with 95% level of confidence approximates 11.3%. The results of data analysis of flashover voltages coefficient of variation be in line with international results.