摘要
雷电感应过电压导致的10 k V配电线路跳闸事故十分频繁,需要合理计算线路雷电感应跳闸率并采取针对性防护措施。利用EMTP中的MODEL模块编程计算线路雷电感应过电压,建立线路模型考虑线路闪络跳闸情况,利用区间统计法求取配电线路雷电感应跳闸率,分析线路工频电压对感应跳闸率的影响,最后讨论安装避雷器的防护效果。分析结果表明:配电线路三相感应过电压波形较为类似,过电压幅值相差不大;雷击点距离线路越近,感应过电压可能引发的线路跳闸次数越多;线路工作电压对雷电感应跳闸率的影响很小,基本可以忽略。安装避雷器可以降低雷电感应跳闸率,每基杆塔安装避雷器的相数越多,避雷器安装间隔越密,防护效果越明显。
Trip faults of 10 kV distribution lines caused by lightning-induced overvoltage occur frequently, It is necessary to reasonably calculate the lightning-induced tripping rate of the line and take targeted protective measures. Lightning-induced overvoltage is calculated by means of model in EMTP. Equivalent circuit of 10 kV distribution line is also established to consider line flash tripping. The interval-statistic method is used to obtain the lightning-induced tripping rate of the distribution line, and the influence of line frequency voltage on the induction trip rate is analyzed. Finally, the protection effect of the lightning arrester is discussed. The analysis results show that the three-phase induction overvoltage waveforms of the distribution line are similar, and the overvohage amplitude is not much different; the closer the lightning strike point is to the line, the more line tripping times may be caused by induced overvoltage; The operating voltage of the line has little effect on the lightning-induced tripping rate and can be basically ignored. The installation of lightning arresters can reduce the lightning induced tripping rate. The more phases are installed in each base tower, the denser the installation interval of arresters, the more obvious the protective effect.
作者
桂前进
江千军
刘辉
张炜
王京景
田宏强
汪伟
GUI Qianjin;JIANG Qianjun;LIU Hui;ZHANG Wei;WANG Jinjing;TIAN Hongqiang;WANG Wei(State Grid Anhui Electric Power Co., Ltd., Anqing Power Supply Company, Anqing 246000, China;State Grid Anhui Electric Power Co., Ltd., Hefei 230022, China)
出处
《电瓷避雷器》
CAS
北大核心
2018年第3期75-80,共6页
Insulators and Surge Arresters
关键词
配电线路
雷电感应
过电压
EMTP
跳闸率
distribution line
lightning-induced
overvohage
EMTP
tripping rate
作者简介
桂前进（1975-），男，高级工程师，主要研究方向为电力系统自动化。
