1000kV交流输电线路绝缘子串污秽特性研究

对1000kV交流输电线路长串绝缘子,按照真型布置进行人工污秽工频耐受特性试验研究。结果表明,绝缘子串的U50%与串长呈非线性趋势;按线性拟合所求取的U50%较试验所求取的要高1.6%～10.2%;不同型式绝缘子串的U50%与SDD为负指数幂关系,其指数范围为-0.202～-0.195,U50%与NSDD为负指数幂关系,其指数约为-0.1341;在相同试验条件下,双伞型绝缘子单“I”串U50%比普通型绝缘子提高约5%,普通型绝缘子双“I”串U50%比单“I”串降低约6%,“V”串U50%比单“I”串提高4%～13%。

Study on Pollution Performance of Insulator String for A.C. Transmission Line of 1 000 kV

Power frequency voltage withstand performance tests were carried out on artificially polluted insulator string for 1 000 kV a.c.transmission line at real model arrangement.The results showed that U50% of insulator string rose non-lineary with string length.The lineary analogous U50% was 1.6%～10.2% higher than tested one.The U50% of different type insulator string was correlated to SDD with negative exponential power of-0.202~-0.195.The U50% values were also correlated with NSDD with negative exponential power of about-0.1341.Under the same test conditions,the U50% of single string of double-shed insulator was about 5% higher than that of normal insulator,the U50% of double string of normal insulators was about 6% higher than that of single string,and that of "V"string was 4%～13% higher than that of single string.