输电线路雷击故障定位与识别

Lightning Fault Location and Recognition Technologies in Transmission Line

雷击故障是输电线路的主要故障,准确定位雷击故障并识别雷击故障能有效提高和改进输电线路的雷击可靠性水平。针对国内现有雷电故障指示装置不能有效识别雷击性质的不足,研究了雷击闪络后的电流信号特征及输电线路发生反击和绕击时的电位变化特征,提出了一种新的雷击故障定位与识别方法,同时开发出了输电线路雷电故障指示装置。仿真试验和实际运行结果表明,采用雷击闪络后的电流信号与输电线路发生绕击和反击时的电压信号相结合的方法能有效地进行雷击故障的定位与识别。

Lightning failure is the main fault causes of transmission lines.Accurate locating lightning faults and identifying lightning faults type are analyzed to improve the lightning reliable levels of transmission lines.To research status of lightning fault location and recognition technologies in transmission line at home and abroad,we analyzed the insufficiencies of the existing lightning fault indication device,such as,being not able to recognize the nature of lightning effectively.The current signal characteristics after lightning flashover and the potential changes characteristics when back flashover and around flashover occurs in transmission line were investigated.Moreover,a new method was put forward for lightning fault location and recognition and a lightning fault recognition device was developed.Simulation tests and practical results show that applying the method of combining the current signal after lightning flashover and the potential changes when back flashover and around flashover can locate and recognize the lightning fault effectively.