考虑暂态过电压特性的架空输电线路雷击故障时空预警方法  

Spatiotemporal Early Warning Method for Lightning Stroke Fault of Overhead Transmission Lines Considering Transient Over-voltage Characteristics

作　　者：谭磊[1] TAN Lei(State Grid Beijing Electric Power Company,Beijing 100035,China)

机构地区：[1]国网北京市电力公司,北京100035

出　　处：《微型电脑应用》2024年第5期205-208,共4页Microcomputer Applications

摘　　要：针对运行环境复杂多变,故障率持续居高不下,雷击故障占比较大,并具有随机性与无法预知性的问题,提出考虑暂态过电压特性的架空输电线路雷击故障时空预警方法。深入解析雷击机理与雷电流,确定雷击(感应雷与直击雷)输电线路暂态过电压计算方式,通过小波多分辨率分解算法处理输电线路暂态信号,评估暂态过电压在信号频段中的能量比,识别累计故障,判断雷击点与故障点是否一致,利用单端检测确定雷击点的位置,完成架空输电线路雷击故障的时空预警。实验数据显示,在不同实验组别背景下,当阈值pΔ取值为9.3时,雷击故障识别精度达到最大值92%,雷击点定位精度高达80%。可以获得精准的雷击故障识别结果与雷击点定位结果,充分证实了提出方法具备较好的雷击故障时空预警效果。Aiming at the problems of complex and changeable operating environment,continuous high fault rate,large proportion of lightning strike faults,randomness and unpredictability,a time-space early warning method for lightning strike faults of overhead transmission lines considering transient overvoltage characteristics is proposed.It analyzes the lightning strike mechanism and lightning current,determines the calculation method of lightning strike(induced lightning and direct lightning)transmission line transient over-voltage,processes the transmission line transient signal through wavelet multi-resolution decomposition algorithm,evaluates the energy ratio of transient over-voltage in the signal frequency band,identifies the cumulative fault,judges whether the lightning strike point is consistent with the fault point,and determines the location of the lightning strike point using single terminal detection.It also completes the time-space early warning of lightning strike fault of overhead transmission lines.The experimental data show that under the background of different experimental groups,when the threshold value pΔis 9.3,the lightning fault identification accuracy reaches the maximum value of 92%,and the lightning point location accuracy reaches 80%.Accurate lightning fault identification results and lightning strike point location results can be obtained,which fully proves that the proposed method has a better time-space early warning effect of lightning strike faults.

关 键 词：架空输电线路 时空预警 雷击故障 暂态过电压 雷击识别 暂态保护 

分 类 号：TM743[电气工程—电力系统及自动化]