摘要
雷电感应过电压导致配电线路发生跳闸或故障的比例要远高于雷电直击,因此需要分析采用线路避雷器对配电线路感应过电压的防护效果。利用EMTP软件编程计算线路雷电感应过电压,分析安装线路避雷器对感应过电压的防护效果,讨论雷电流幅值和雷击点距线路距离、避雷器安装间距、接地电阻对避雷器抑制感应过电压效果的影响。分析结果表明:配电线路安装线路避雷器后能够在一定程度抑制雷电感应过电压;雷电流幅值越高、雷击点距线路近,避雷器抑制感应过电压的效果越弱;避雷器安装间距影响对感应过电压的防护效果,安装越密,线路感应过电压降低越明显。接地电阻对避雷器感应过电压防护影响非常大,过高的接地电阻会严重削弱避雷器对感应过电压的抑制效果,因此需要尽可能降低避雷器接地电阻。
Line faults caused by lightning induced overvoltage are far higher than direct lightning,so it is necessary to analyze application of line surge arresters against lightning induced overvoltage of distribution lines. Lightning induced overvoltage was calculated by means of model in EMTP. Protection effect of installing line arresters was analyzed. Influence of distance from lightning strike point to the distribution line,amplitude of lightning current and line arrester configurations were discussed. Results show that:overvoltage of the distribution line could be inhibited to some degree after installing line arresters. Inhibition effect of the line arresters decreases with the decreasing of distance from lightning strike point to the line as well as the increasing of amplitude of lightning current. Line arrester configurations influence inhibition effect of arresters and lightning induced overvoltage decreases along with the installing density increases. Grounding resistance has also strongly influenced inhibition effect of the line arrester which will be been seriously weakened by exorbitant grounding resistance,so it is essential to reduce grounding resistance as low as possible.
作者
罗永志
王艳辉
LUO Yongzhi;WANG Yanhui(State Grid East Inner Mongolia Electric Power Supply Co.,Ltd.,Hohhot,010010)
出处
《电瓷避雷器》
CAS
北大核心
2019年第1期84-88,94,共6页
Insulators and Surge Arresters
关键词
配电线路
雷电感应过电压
EMTP
避雷器
distribution lines
lightning induced overvoltage
EMTP
surge arrester
作者简介
罗永志(1967—),男,高级工程师,研究方向为:电力系统技术。
