基于EMTP模拟雷电流入侵低压配电线路仿真与防护研究  

Simulation and Protection Research on Simulating Current Impinging into the Low Voltage Distribution Circuit Based on EMTP

作　　者：朱泽伟[1] 周歧斌[1] 陈贻亮 唐涛[3] ZHU Zewei ZHOU Qibin CHEN Yiliang TANG Tao(Shanghai Lightning Protection Centre, Shanghai 201615, China Wuzhou Meteorological Office, Wuzhou 543002, China Chengdu University of Information Technology, Chengdu 610225, China)

机构地区：[1]上海市防雷中心,上海201615 [2]梧州市气象局,广西梧州543002 [3]成都信息工程大学,成都610225

出　　处：《电瓷避雷器》2016年第5期60-66,83,共8页Insulators and Surge Arresters

基　　金：国家自然科学基金(编号:61201095);四川省科技支撑计划项目(编号:2015GZ0282)

摘　　要：架空线路未设置线路及绝缘子闪络防护、变压器二次侧未设置合理电涌防护等措施易导致线路及绝缘子闪络导致线路跳闸、雷电电磁脉冲造成二次侧设备损坏等故障频繁发生。基于EMTP搭建典型低压配电入户线路变压器一、二次侧模型,计算不同电涌保护器安装方式下瞬态过电压变化特性及不同节点幅值分布特征,验证了高低压侧及二次侧设置三级SPD的优化防护效果,对负载及接地电阻与各级瞬态过电压分布相关性影响进行横向分析,总结出降低直击线路概率、实现高低压侧间隙性避雷器放电特性与二次侧三级SPD伏安特性合理绝缘配合方案。Overhead line without line or insulator flashover protection, or transformer secondary side without the qualified surge protective measures will cause the line tripping frequently by the flashover on line or insulator; and the secondary side equipment will be damaged by the lightning electromagnetic pulse. By building the typical low-voltage distribution lines and transformer secondary side model, the variation characteristics distribution of transient overvoltage and amplitude at different nodes is calculated. By compareing the method of different surge protector installing method with EMTP, the optimization of the protective effect under the condition of three-level SPD installed on the transformer＇s high and low voltage sides and secondary side is verified. Then the correlation between the perameter of the load, lightning current, the grounding resistance and the distribution of transient overvoltage is analyzed. The method of reducing the probability of striking on lines is summarized. The insulation coordination scheme between the gap discharge performance of the surge arrester mounted at high and low voltage sides and the three-level SPD V-I characteristic mounted at the secondary side is presented.

关 键 词：雷电流特征 配电线路 瞬态过电压 EMTP SPD 

分 类 号：TM863[电气工程—高电压与绝缘技术] TM743