摘要
雷电感应过电压是造成配电网故障的重要原因之一,针对雷电感应过电压波形特征不清晰的问题,作者采用过电压在线监测系统,对实际运行的佛山10kV富油甲线雷电感应过电压波形进行观测,根据波形特征给出了过电压的波形参数。结果表明,配电线路各相感应电压叠加在运行电压波形上,不同相上感应过电压与对应的回击电流在幅度、时间间隔和波形上都存在同时性,该线路观测的雷电感应电压波形表现为波头时间短、后续发生双极性高频振荡并逐渐转变为低频振荡的波形特点,首次回击感应过电压幅值大于后续回击过电压幅值,首次回击过电压的波头时间比后续过电压长,观测结果对于配电线路雷电保护具有重要意义。
Lightning over-voltage is a main cause of distribution network fault.Aiming at the problem that the waveform characteristics of lightning induced over-voltage are not clear,the on-line over-voltage monitoring system was used to observe the lightning induced over-voltage waveform of 10 kV Fuyoujia line in Foshan city,and the waveform parameters of over-voltage were given according to the waveform characteristics.The results show that the induced voltage of each phase of the distribution line is superimposed on the operation voltage waveform,and the induced over-voltage on different phases and the corresponding return stroke current have simultaneity in amplitude,time interval and waveform.The voltage waveform show short front time,bipolar high-frequency oscillation at wave tail which gradually converts to low-frequency oscillation.The amplitude of the first over-voltage is greater than that of the subsequent over-voltage.The front time of the first over-voltage is much longer than that of the subsequent over-voltage.The observation results are of great significance for lightning protection of distribution line.
作者
王建国
王守鹏
蔡力
孔争
樊亚东
WANG Jian-guo;WANG Shou-peng;CAI Li;KONG Zheng;FAN Ya-dong(School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China)
出处
《电机与控制学报》
EI
CSCD
北大核心
2021年第1期1-7,共7页
Electric Machines and Control
基金
国家自然科学基金(51807144)。
关键词
配电线路
雷电过电压
在线监测
波形特征
过电压幅值
波头时间
distribution line
lightning induced over-voltage
on-line monitoring
waveform characteristics
the amplitude of the over-voltage
the front time of the over-voltage
