摘要
在中重冰区地线覆冰将影响架空输电线路的安全运行,地线除冰尤为重要。直流融冰是解决架空输电线路导线覆冰的有效措施,地线绝缘化是地线能够进行直流融冰的前提条件。地线绝缘化后其电气性能必须满足正常运行、融冰运行及线路防雷等的条件。笔者以500 kV威甘甲线地线绝缘化为例,介绍其地线绝缘化的方式,及地线绝缘化后绝缘子及绝缘子间隙的电气性能;利用EMTP仿真软件对地线间隙击穿与雷电流幅值的相关性进行了分析;理论计算威甘甲线地线绝缘化前后其保护角及雷击跳闸率的变化,得出因融冰需要地线绝缘化后500 kV威甘甲线耐雷性能变化不大的结论。
Ground icing will influence the safe operation of overhead transmission line in medium and heavy icing areas,and ground wire deicing is particularly important. DC ice-melting is one of the effective measures to remove icing of overhead transmission line, and ground wire insulation is the precondition for DC ice-melting. After insulation, ground wire＇s electric performance must meet the conditions of normal operation,ice-melting operation,and lightning protection of transmission line. This paper takes ground wire of 500 kV Weiganjia transmission line for example to introduce the insulation way, and to discuss the electrical performances of the insulator and insulator gap after ground wire insulation. The simulation software EMTP is adopted to analyze the relativity between breakdown of ground wire insulator gap and lightning current amplitude. The protection angles and the lightning trip rates of the Weiganjia transmission line before and after ground wire insulation are calculated, and conclusion is drawn that the lightning protection performance of the 500 kV Weiganjia transmission line changes little after its ground wire insulation for DC ice-melting.
出处
《高压电器》
CAS
CSCD
北大核心
2014年第9期76-81,88,共7页
High Voltage Apparatus
关键词
地线绝缘化
间隙
耐雷性能
跳闸率
直流融冰
ground wire insulation
gap
lightning protection performance
trip rate
direct current ice-melting
