利用母线CVT响应电流实现变电站雷电侵入波在线监测  

On-Line Monitoring of Lightning Surge Intruding Into Substation by Current Response of Busbar Capacitor Voltage Transformer

作　　者：彭向阳 钱冠军 王红斌 吕鸿 余钢华 高峰[3] 

机构地区：[1]广东电力科学研究院,广东省广州市510080 [2]武汉三相电力科技有限公司,湖北省武汉市430074 [3]华中科技大学电气与电子工程学院,湖北省武汉市430074

出　　处：《电网技术》2011年第7期203-207,共5页Power System Technology

摘　　要：介绍了110 kV以上变电站雷电侵入波在线监测的基本原理,以及高频下电容式电压互感器(capacitor voltage transformer,CVT)回路电阻、电感、电容等值参数计算方法并通过仿真模型分析了等值参数计算误差对过电压监测的影响。提出了一种基于CVT响应电流的侵入波在线监测方法,以克服现有研究存在的不足。基于这种监测方法,开发了一种利用变电站母线CVT回路电流实现母线过电压监测的系统,通过该系统可以进行进线段侵入波电流和母线过电压的监测,实现变电站事故监测统计的自动化、智能化和信息化。最后通过电磁暂态程序(alternative transient program,ATP)仿真结果和现场运行中实测波形的对比,说明了监测系统可以持续有效运行。The basic principle of on-line monitoring of lightning surge intruding into substations of 110 kV and above voltage classes as well as the calculation of equivalent parameters of resistance, inductance and capacitance in the loop circuit of capacitor voltage transformer （CVT） under high-frequency are presented. The influences of calculation errors of equivalent parameters on overvoltage monitoring are analyzed by simulation model. An approach for on-line monitoring of lightning surge intruding into substation by current response of CVT is proposed to remedy the defects in existing monitoring methods. Based on the proposed method, a busbar overvoltage monitoring system based on current in busbar CVT circuit of substation, by which can monitor busbar overvoltage and intruding currents via inlets can be monitored,-is developed to implement the automation, intelligentization and informatization of monitoring and statistics of failures occurred in substation. Comparison of actually measured waveforms and results of simulation by alternative transient program （ATP） shows that the proposed monitoring system can operate continuously and effectively.

关 键 词：雷电侵入波 过电压 在线监测 电容式电压互感器 等值参数 

分 类 号：TM86[电气工程—高电压与绝缘技术]