任楼煤矿电容电流危害分析与治理研究

针对中性点不接地系统单向接地电容电流易造成配电网络次生灾害和设备损害、易产生单向电弧接地过电压和铁磁谐振过电压的问题,分析评估了任楼煤矿电网电容电流的测试数据,根据评估结果制定了电容电流治理方案,即将中性点不接地系统改为中性点经消弧线圈接地运行方式,并给出了具体实施方案。运行结果表明,该方案大大减少了高幅值电弧接地过电压发生的几率,抑制了铁磁谐振过电压,有利于提高电缆寿命。

Research of Harm Analysis of Capacitance Current of Renlou Coal Mine and Its Treatment

In order to solve the problem that single-phase grounding capacitance current of isolated neutral system could cause secondary disaster and equipment damage in distribution network and generate single-phase arc grounding over-voltage and ferromagnetic resonance over-voltage,the paper analyzed and evaluated testing data of capacitance current of distribution network of Renlou Coal Mine,established a treating scheme of capacitance current according to evaluating results,namely changing isolated neutral system to neutral grounding running mode by arc suppression coil,and gave concrete implementing scheme.The running result showed that the scheme greatly decreases rate of accidents of arc grounding over-voltage with high amplitude and restrains ferromagnetic resonance over-voltage,which was good for prolonging usage time of cable.