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针对我国煤矿井下配电系统中性点普遍采用小电流接地方式的特殊现状,为解决单相接地故障的快速选线问题,研究了中性点不接地、经消弧线圈接地以及经高阻接地3种情况下的单相接地故障零序电量变化特征,提出了基于零序及正序功率方向检测的故障选线方案,借助故障时线路产生的零序电压、零序电流及功率方向等信号作为选线依据,设计了硬件电路,并采用大型商业化软件PSCAD/EMTDC对该方案进行了数字化仿真测试,结果表明:该方案选线准确、动作可靠,验证了适用性与可行性。
In order to solve the problem of fast line selection of single-phase ground fault, aiming at the special current situation that the neutral point of underground power distribution system in our country is generally used with small current grounding method, the neutral point is not grounded, the arc suppression coil is grounded, Three kinds of cases of single-phase ground fault zero-sequence power changes characteristics, proposed based on zero sequence and positive sequence power direction detection of fault line selection scheme, with the fault line zero sequence voltage, zero sequence current and power direction and other signals The hardware circuit was designed as the route selection and the digital simulation test was carried out by using the large-scale commercial software PSCAD / EMTDC. The results show that the scheme is accurate and reliable in operation, verifying the applicability and feasibility.