摘要
110 kV莆红佳线自2009年投运以来累计发生雷击跳闸故障10起,虽然均重合闸成功,但对电网的安全稳定运行造成了重大威胁。针对该线路在接地电阻合格,且架设了0°保护角避雷线的情况下,遭受异常雷击的原因进行理论分析。经分析可知,该线路遭受雷击主要与雷电陡度、导线对雷电的吸引力等原因有关。为此提出了一种新型的灭弧防雷间隙,该间隙防雷效1果不受电网电阻、雷电陡度、雷电吸引力等因素影响,可以降低异常雷击事故发生概率。
There are total ten trip accidents caused by lightning stroke on the 110 kV Pu-hong-jia line since its operation in 2009, which is serious threats to the security operation of power grid even though the action of recloser were successful. The reason of abnormal lightning stroke is analyzed in theory under conditions that the ground resistance is qualified and the lightning shield line with 0~ protection angle has been constructed. It is found that the stroke has relations with lightning steepness and the attractive force of the line to the lightning. A new type of arc extinguishing lightning protection gap is proposed, which is not influenced by ground resistance, lightning steepness and lightning attractive force and thus can decrease the probability of abnormal lightning stroke accident.
出处
《广西电力》
2013年第3期36-38,63,共4页
Guangxi Electric Power
关键词
输电线路
雷击
雷电陡度
矢量电气几何模型
电弧
transmission line
lightning
lightning steepness
vector electric geometry model
arc
