雷电波的衰减与变形问题研究  

Research on Attenuation and Distortion Problems of Lightning Overvoltage

作　　者：陈丛丛[1] 张小青[1] 

机构地区：[1]北京交通大学电气工程学院,北京100044

出　　处：《中国电力》2013年第12期12-15,58,共5页Electric Power

基　　金：国家自然科学基金资助项目(50977002)

摘　　要：在同时考虑冲击电晕和由集肤效应引起的大地阻抗频率特性的基础上,研究雷电过电压波沿架空线路传播时衰减与变形的问题。对冲击电晕和大地阻抗进行离散化和线性化,计算出相应的参数,这种计算方法不仅简化了算法,而且可用于工程实践中。在PSCAD软件中建立电力系统的输电线路模型,模拟雷电流打在线路杆塔顶部发生反击,测量同一点在不同情况下的雷电过电压波,然后进行对比,并测量在不同情况下的耐雷水平,准确直观地反映了冲击电晕和集肤效应这2种因素对雷电波的影响,为系统设计和工程实践奠定了基础。With consideration of the impact corona and the earth impedance caused by skin effeets, the attenuation and distortion problem of lightning overvoltage along the overhead lines is studied in this paper. The impact corona and the earth impedance are firstly discretized and linearized, and then the corresponding parameters are calculated. This calculation method is not only simple in algorithm, but also applicable to engineering practice. In the end, a transmission line model is established with PSCAD software. Through modeling the lightning current hitting on the tower top and the resuhed back-flashover, the lightning surge waves were measured at the same point under different conditions for comparison and the lightning withstand level was also measured. This modeling method can reflect the effects of corona and skin effects on wave accurately and intuitively and can be a good reference for system design and engineering practice.

关 键 词：冲击电晕 集肤效应 PSCAD 频率特性 耐雷水平 

分 类 号：TM863[电气工程—高电压与绝缘技术]