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基于相电流高频特征识别的配电网故障指示器原理

, PP. 465-470

Keywords: 配电网,故障指示器,故障定位,小波变换

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Abstract:

小电流接地系统单相接地故障场景下的定位问题一直是研究热点与难点之一.本文首先对配电网中不同级别的馈线故障相电流进行了理论及时频域分析,在此基础上借助于小波变换,结合配电网结构特点对故障相电流的高频特征识别,并提出了一种新型配电网故障指示器原理及定位搜索算法.与现有故障指示器实现原理相比,该方案不依赖于各级馈线处零序电流的获取,且无需额外硬件投资,有较强的可实施性.基于PSCAD/EMTDC的仿真结果证明该原理能够有效较好地适应不同的中性点接地方式,过渡电阻及故障时刻电压情形.

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