摘要
准确辨识架空输电线路雷电过电压类型对改进防雷设计具有十分重要的意义。为此,分析了感应、反击、绕击3种雷电过电压的发生机理,对输电线路雷电流行波波形特点的研究表明感应雷电过电压三相电流行波相似程度大,反击雷电过电压发生时,闪络相在绝缘子未击穿时,由于避雷线等的分流、耦合作用,存在空间电磁耦合电流,而绕击过电压闪络相不存在空间电磁耦合电流。提出了以输电线路雷电流行波三相电流波形最小相似度、上升时间比作为上述3种雷电过电压识别判据。还分析了上述特征参量在工程应用中可能受到的干扰因素及解决方法。大量EMTP仿真表明所提取的特征量有效可行。
Identifying the type of lightning overvoltages in overhead power transmission lines is crucial for improving lightning protection.The mechanisms of induced lightning,shield failure,back flashover are discussed.The analysis of the transmission line lightning current waveform shows that the three-phase current waves are quite similar when induced lightning happens.The space electromagnetic coupled current exists in fault phase before the flashover of insulators when back flashover happens,however,there is no space electromagnetic coupled current in fault phase when shield failure happens.Based on these characteristics of the transmission line lightning current wave,the minimum similarity coefficient of three-phase current wave and the rise time rate are raised as identification parameters for lightning overvoltages identification.Influential factors and solutions in application are also presented.The EMTP simulation results demonstrate that the identification parameters proposed are valid and effective.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2010年第3期590-597,共8页
High Voltage Engineering
基金
国家重点基础研究发展计划(973计划)(2009CB724504)~~
关键词
感应雷
反击
绕击
识别
三相电流行波
架空输电线路
induced lightning
back flashover
shield failure
identification
three phase current wave
overhead power transmission line
