倒T型布置绝缘子串污秽闪络特性

Pollution Flashover Characteristics of Insulator Strings with Inverted T-type Arrangement

合理的绝缘子串布置方式是提高污秽闪络电压的有效方法之一,目前国内外对于绝缘子串布置方式的研究主要集中在V型串和倒V型串,对于倒T型布置的绝缘子串闪络特性缺乏基础试验研究。为此,以XWP–70等3种绝缘子为试品,采用均匀升压法展开试验研究并与普通悬垂串进行对比。研究表明:倒T型布置绝缘子串的闪络电压(Uf)与附盐密度(ρESDD)满足幂函数关系;倒T型布置的绝缘子串闪络电压相较于普通悬垂串提高11.6%～22.3%,而且随着附盐密度的增加,闪络电压提高百分比也随之增加。根据实验结果,计算出倒T型绝缘子串在各个污区的串型等效系数,方便倒T型绝缘子串串长的选择。

Reasonable insulator string arrangement is one of the effective ways to improve the pollution flashover voltage.At present, most of the existing references of the forms of insulator strings are mainly related to insulator string arranged in V-type and inverted V-type, but rarely related to insulator string arranged in inverted T-type. We adopted a uniform increase voltage method to test XWP-70 and other two inverted V-type insulator strings and compared with the ordinary hanging string. Through the experiments, it can be found that the flashover voltage of the inverted T-type insulator string has a power function relation to ESDD. Compared with the ordinary hanging string, the inverted T-type insulator string flashover voltage increases by 11.6%~22.3%;and with the increase in salt density, the percentage of flashover voltage improvement also increases. According to the results, the equivalent coefficient of the inverted T-type insulator string in each pollution area is calculated, and it will be convenient to select the inverted T-type insulator string’s length.