±1100 kV换流站直流MOA综合老化特性研究Study on Integrated Aging Characteristics of DC MOV in ±1100kV Converter Station
付颖;乐波;余芳;魏琪;郭洁;
摘要(Abstract):
在投运的特高压换流站中,各设备承受的运行电压、过电压负荷、波形差异大,不同节点MOA面临不同的老化威胁,研究直流MOV在各种负荷下老化特性对于直流MOA的参数选取具有重要意义。为了分析直流MOA可能承受的操作过电压、近区雷击和远区雷电过电压对MOV老化的影响,对±1100 kV换流站中直流MOA用的3种典型MOV施加不同强度直流、不同组合方式的操作冲击、大电流冲击、雷电波冲击,进行综合加速老化实验,研究直流MOV承受长期运行电压及不同冲击负荷应力时的综合老化特性,实验结果表明:冲击电流波形、强度、频次等对MOV性能的劣化影响权重排序为:大电流冲击>操作冲击>雷电波冲击;配方工艺对MOV的劣化特性影响很大;MOV在综合老化下的劣化状态存在着明显的极性效应。
关键词(KeyWords): 特高压直流;直流MOV;综合老化;雷电冲击;操作冲击;大电流冲击
基金项目(Foundation): 国家电网公司科技项目(SGZB0000JSJS1700421)~~
作者(Author): 付颖;乐波;余芳;魏琪;郭洁;
Email:
DOI: 10.13335/j.1000-3673.pst.2019.1945
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