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零序分布参数的单相接地故障精确定位研究

, PP. 472-479

Keywords: 分布参数,单相接地故障,零序特征,精确定位

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Abstract:

针对中性点不接地电网的单相接地故障测距问题,提出了基于故障后分布参数线路零序特征的测距方法.该方法考虑故障后零序电压,零序电流的沿线分布特征,分析零序特征作为中性点不接地系统单相接地故障点测量判据的适用性与可行性,并建立了零序特征量与故障距离的双曲函数关系表达式.为解决复平面双曲函数方程组求解困难问题,根据双曲函数的泰勒展开式,在分析传播常数数量级的基础上,将双曲函数方程合理简化为二次方程表征分布参数模型.为消除线路分布参数误差对测距结果的影响,基于加权最小二乘原理,利用非故障线路采样信息辨识故障线路零序参数,理论推导证明了其可行性.仿真结果表明,在正确选出故障馈线的基础上,该方法测距精度高,测距结果不受过渡电阻,故障距离影响.

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