摘要
随着超高压架空线路电压等级的提高,雷电现象下输电线路未造成短路故障的情况越来越多,这将使保护装置发生误动作。对于这种雷电干扰现象,文中利用MATLAB软件构建超高压输电线路仿真模型,对雷电故障及普通短路故障进行不同条件下的仿真并对数据及波形进行分析。发现他们近似分量能量的百分数值存在着很大的差别,由此构成识别雷电干扰的判据,大量的仿真数据表明所提方法是正确、有效的。
With the elevation of voltage class of EHV overhead line, the short - circuit fault increasingly does not occurs in transmission lines under the thunder, thus it would result in error action of protector. Aiming at the lightning interference, the EHV transmission line model using MATLAB is established. The simulation is performed in different conditions for lightning fault and short - circuit fault, and the data and waveform are analyzed. It is found that the percent value of approximation en- ergy have a great difference. And then it becomes the criterion to identify the lightning interference. A large number of simulation data indicates that the method is correct and effective.
出处
《四川电力技术》
2009年第3期31-35,共5页
Sichuan Electric Power Technology
关键词
输电线路
识别
雷电干扰
暂态仿真模型
故障
transmission line
identification
lightning interference
transient simulation model
fault
