避雷器通流容量对220kV线路断线谐振过电压影响分析  

Analysis of Influence of Arrester Current Carrying Capacity on Resonant Overvoltage of 220kV Line

作　　者：何龙 朱咏明 马金财 吴伟丽 刘俊 祁鹏 HE Long;ZHU Yongming;MA Jincai;WU Weili;LIU Jun;QI Peng(Changji Power Supply Company of State Grid Xinjiang Electric Power Co.,Ltd.,Changji 831100,China;School of Electrical and Control Engineering,Xi'an University of Science and Technology,Xi'an 710000,China;Anhui Zhengguang Power Technology Co.,Ltd.,Hefei 230000,China)

机构地区：[1]国网新疆电力有限公司昌吉供电公司,新疆昌吉831100 [2]西安科技大学电气与控制工程学院,陕西西安710000 [3]安徽正广电电力技术有限公司,安徽合肥230000

出　　处：《变压器》2024年第7期47-51,共5页Transformer

基　　金：国家电网公司科技项目(SGNEIHDKJXS2012021)。

摘　　要：本文作者针对220kV变压器出现的铁磁谐振过电压问题,分析了金属氧化物避雷器(MOA)通流容量对谐振过电压的影响作用。首先,搭建了包含站用变压器铁心非线性电感、断口电容和避雷器等元件构成谐振系统,从数学分析避雷器对断线谐振过电压的抑制机理;其次,根据实际系统参数搭建了220kV输电系统断线谐振仿真模型,分析了避雷器对过电压的影响作用,同时还考虑了不同断线位置、不同线路长度等工况对避雷器通流容量水平的影响,确定了容易引起避雷器击穿风险的断线故障位置和线路长度。研究结果不仅可以解释避雷器在晴好天气被击穿的事件原因,也可为避雷器选型及维护提供参考。Aiming at the ferroresonance over-voltage problem of 220kV transformer,the influence of the current capacity of metal oxide arrester(MOA)on the resonance overvoltage is analyzed.Firstly,a resonance system consisting of the nonlinear inductance of the transformer core,the breaking capacitor and the lightning arrester is built,and the suppression mechanism of the lightning arrester to the breaking resonance over-voltage is analyzed mathematically;Secondly,based on the actual system parameters,a simulation model of the resonance of the 220 kV transmission system is built,and the influence of the arrester on the overvoltage is analyzed.At the same time,the influence of different disconnection positions,different line lengths and other working conditions on the current carrying capacity level of the arrester is also considered,and the location of the disconnection fault and the line length that are likely to cause the breakdown risk of the arrester are determined.The research results can not only explain the cause of the breakdown of the arrester in fine weather,but also provide a reference for the selection and maintenance of the arrester.

关 键 词：断线谐振 过电压 氧化锌避雷器 通流容量 

分 类 号：TM406[电气工程—电器]