110kV和220kV变压器中性点雷电过电压仿真与分析  

Lightning Over Voltage Simulation and Analysis of 110 kV and 220 kV Transformer Neutral Point

作　　者：曹冬冬[1] 常美生[1] 

机构地区：[1]山西大学工程学院,太原030013

出　　处：《电力学报》2014年第1期38-42,共5页Journal of Electric Power

摘　　要：为了更好地对110 kV和220 kV变压器中性点保护的绝缘配合进行参数整定,得到中性点处的实际过电压情况,文中考虑了入侵变电所的雷电波幅值和陡度受到变电所进线段保护时的限制作用,建立了变压器在雷电过电压下的绕组仿真模型,并通过ATP-EMTP软件对变压器中性点受到线路上的入侵雷电波作用时的实际过电压情况进行仿真,结果表明:无论变压器中性点处是否接有避雷器,其实际过电压波形与用作中性点处整定参考的标准雷电波的波形有很大差异,这也是导致中性点处避雷器和间隙绝缘配合失调的主要原因之一。In order to get better insulation coordination parameter tuning of 110 kV and 220 kV transformer neutral point protection ＆ get the neutral point real overvoltage condition, this paper considers the restricted action when lightning wave amplitude and steepness intrude the substation, they are protected by inlet wire sections in the substation, builds winding simulation model of transformer in lightning overvoltage, and with ATP-EMTP sottware stimulates the actual over voltage when transformer neutral point is intruded by the lightning wave. The results show that whether the neutral point of trans- former is connected with a lightning arrester or not, the actual voltage waveform and lightning waveform used as the neutral point setting reference standard have the very big differences, which is one of the main causes leading to insulation coordination disorder of neutral point arrester and clearance.

关 键 词：变压器 过电压 避雷器 进线段保护 

分 类 号：TM41[电气工程—电器]