摘要
针对一起500kV直流输电线路雷击故障跳闸,通过分析确定故障性质和雷击点范围,得出绕击是造成线路跳闸的主要原因。为提高山区输电线路防雷水平,揭示部分已安装塔顶避雷针或避雷线侧针保护失效原因,应加强对雷击点位置的诊断分析。根据直流线路正极性易遭受雷击的特点,通过计算防绕击避雷针的保护范围,提出直流线路较小保护角防止雷电绕击的应对措施。
In view of a trip out fault on 500 kV DC transmission line caused by hghtnlng stroke, tnls paper determines the fault character and strike point range through analysis and obtains that the shielding failure is the main cause of line trip. In order to improve the transmission line lightning protection level at the top of mountain, it should be to reveal the reason for the protection failure of part of installed lightning rod or wire side needle and to strengthen the diagnosis analysis of the lightning strike point position. According to the characteristics of the DC transmission lines which are vulnerable to positive lightning strike, relevant measures that a smaller angle of the DC transmission line could prevent lightning strike are proposed through calculating the protective confines of lightning rod.
出处
《电瓷避雷器》
CAS
北大核心
2013年第5期107-111,共5页
Insulators and Surge Arresters
基金
浙江省电力公司科技项目(编号:ZDK/GW006-2012)
关键词
直流线路
雷电绕击
保护角
屏蔽
DC transmission line
lightning shielding failure
protection angle
shield
