基于ATP的超高压变电站二次设备防雷保护的仿真  

Simulation of secondary equipment lightning protection in EHV substation based on ATP

作　　者：李宏博[1] 李卫国[1] 吴雄[1] 李德超[2] 郑伟 

机构地区：[1]华北电力大学高电压与电磁兼容实验室,北京102206 [2]长沙理工大学电气与信息工程学院,湖南长沙410077 [3]61251部队,河北秦皇岛066102

出　　处：《电力自动化设备》2009年第5期142-144,共3页Electric Power Automation Equipment

摘　　要：雷区某500 kV变电站发生的2次雷击事故分析出:第1次是雷电流入侵远动控制屏的二次回路,造成线路开关屏跳闸事故;第2次雷击事故造成后台监控系统异常。判断是该变电站二次系统等电位接地方式有问题,二次装置两端存在电位差,使二次装置损坏。变电站二次设备有浮点接地、一点接地和多点接地3种方式。分析了串联一点接地和并联一点接地,并联一点接地目前在变电站二次设备中广泛采用。在ATP图形预处理程序中建立并联一点接地仿真模型,采用Slope-Ramp模拟通过避雷器泄漏到变电站地网中的雷电流进行了仿真。研究得出,在变电站二次设备中采用高、低频混合信号接地系统,真正做到二次设备之间等电位连接是避免事故的关键。Two lightning accidents occurred in a 500 kV substation are analyzed： the lighting intrusion on the secondary circuit of telecontrol system causing line and the lighting interference in the proper operation of monitoring system. Analysis pointed out that the equipotential earthing mode of substation secondary system is wrong, which causes the potential difference between two ends of secondary equipment and damages the equipment. The three earthing modes of substation secondary equipment are discussed： floating-point, one-point and multipoint. Series one-point and parallel one-point earthing are analyzed. The latter is widely used in substations. The simulation model of parallel one-point earthing is built with ATP graphic pretreatment program and the lighting current leaked into substation earthing grids via arrester is simulated with Slope-Ramp. Results show that, the application of mixed earthing system in secondary equipment for high and low frequency signals and the equipotential connection among secondary equipments are the key measures to prevent accidents.

关 键 词：电磁暂态计算程序 变电站 雷电流 二次设备 一点接地 超高压 防雷保护 

分 类 号：TM734[电气工程—电力系统及自动化] TM774