刘宝稳;马宏忠;

• 1:河海大学能源与电气学院

摘要(Abstract)：

不对称电网高阻接地故障相的选择和过渡电阻的测量较为困难。文章从新的角度阐述电网零序电压的产生机理和物理意义:不对称电网将自适应的产生零序电压,零序电压在零序阻抗上产生的电流完全补偿电网的"零序不对称电流"。根据零序电压产生的机理,解释中性点不接地系统不存在零序电流的原因,给出中性点经阻抗接地电网零序电压的等效运算电路图,实现接地故障电流的预测。通过比较各相电压与故障电流的相位可判别出故障相,然后根据故障相电压和故障电流的幅值计算过渡电阻。理论分析及仿真验证表明所述方法不受电网不对称和负荷电流变化的影响,精度高,应用方便。

关键词(KeyWords)： 零序电压;单相接地故障;不对称电网;过渡电阻;故障相

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(51177039)~~

作者(Author): 刘宝稳;马宏忠;

Email:

DOI: 10.13335/j.1000-3673.pst.2015.05.041

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