基于网格法的工作电压下雷电侵入过电压研究  

Research on Lightning Intruding Overvoltage Under Operating Voltage Based on Grid Method

作　　者：罗喻扬 李化 江宇栋 刘瑞琪 林福昌 LUO Yuyang;LI Hua;JIANG Yudong;LIU Ruiqi;LIN Fuchang(State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering,Huazhong University of Science&Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学电气与电子工程学院强电磁工程与新技术国家重点实验室,武汉430074

出　　处：《高电压技术》2023年第6期2607-2614,共8页High Voltage Engineering

摘　　要：为研究工作电压对雷电侵入波过电压的影响规律,基于行波理论网格法分析了设备与避雷器间电气距离不同时工作电压对雷电侵入波传播过程的影响,并结合实例分析了考虑工作电压前后设备过电压差异,进一步研究了设备过电压取最大值时对应工作电压的取值规律。结果表明设备过电压取最大值时对应的工作电压在电气距离不同时并不恒定,而是随电气距离的增大逐渐从与雷电同极性峰值处向反极性峰值处移动。另外存在临界电气距离,工作电压主要影响电气距离大于该临界距离时的设备过电压。对于66 kV及以上线路,工作电压对设备过电压的影响均可达10%以上,需要考虑工作电压的影响。In order to study the influence of operating voltage on lightning intruding overvoltage,based on the traveling wave theory,the influence of operating voltage on propagation process of lightning intruding wave is analyzed when the electrical distance between equipment and lightning arrester is different.Combined with a project case,the difference of equipment overvoltage before and after the operating voltage is taken into account is analyzed,and the value rule of the operating voltage when the overvoltage is the maximum is further studied.The results show that when the equipment overvoltage reaches its maximum value,the corresponding operating voltage is not constant when the electrical distance is different,and gradually moves from the same polarity peak to the opposite polarity peak with the increase of the electrical distance.In addition,there is a critical electrical distance,and the operating voltage mainly affects the equipment overvoltage when the electrical distance is greater than the critical distance.For 66 kV and above lines,the influence of operating voltage on equipment overvoltage exceeds 10%,thus the influence of operating voltage should be considered.

关 键 词：工作电压 雷电侵入过电压 电气距离 波过程 网格法 避雷器残压 陡度 

分 类 号：TM86[电气工程—高电压与绝缘技术]