高压电器2013，Vol.49Issue(7)：60-65,70,7.
500 kV输电线路绝缘子融冰闪络事故分析及应对措施研究
Analysis and Countermeasures of Ice-melting Flashover for Ice-covered Insulator Strings of 500 kV Transmission Line
巢亚锋 1黄福勇 1蒋兴良 2周卫华 1王成1
作者信息
- 1. 湖南省电力公司科学研究院,长沙410007
- 2. 重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044
- 折叠
摘要
Abstract
Although ice-melting flashover of insulator strings has become one of the important problems which have a severe impact on the safe operation of transmission lines,the analysis of ice-melting flashover for ice-covered parallel insulator strings is rarely to see.This paper study on the impact factors of ice-melting flashover based on two times of ice-melting flashover obstacles in field for ice-covered long insulator string of 500 kV transmission line.The influence of crystallization effect on the redistribution of conductive ions during the freezing water transition from liquid to solid phase is discussed.The impact of parallel arrangement,units and structured with alternately large and small diameter sheds on the ice-melting flashover gradient of insulator strings is analyzed.The base value of AC ice-melting flashover voltage gradient of 500 kV transmission line is determined as 65 kV/m.To type Ⅰ and type Ⅱ suspension insulator strings of 500 kV transmission line,the countermeasures such as change the arrangement mode of insulators and reform the tower head to prevent ice-melting flashover are proposed.关键词
输电线路/覆冰/融冰水/晶释效应/闪络/应对措施Key words
transmission line/ icing/ melting ice water/ crystallization effect/ flashover/ countermeasures分类
信息技术与安全科学引用本文复制引用
巢亚锋,黄福勇,蒋兴良,周卫华,王成..500 kV输电线路绝缘子融冰闪络事故分析及应对措施研究[J].高压电器,2013,49(7):60-65,70,7.
