煤矿井下电缆单相接地故障测距

  煤矿井下电缆单相接地故障测距

矿井配电网为单端供电系统，其中性点不接地或通过消弧线圈接地，当出现单相接地故障时，由于故障电流微弱，故障点位置很难查找。针对该问题，提出了一种基于零模和线模行波波速差的单端行波故障测距法，详细分析了行波测距理论，阐述了线模波速与零模波速的测量方法。在理想情况和故障点存在过渡电阻情况下的仿真结果证实了该方法的有效性和可行性。

The mine distribution network is a single-ended power supply system, its neutral point is ungrounding or grounding by arc suppression coil. When single-phase grounding fault happened, fault current is weak, so it is very hard to locate fault position. To solve the problem, the paper proposed a single-ended traveling wave fault ranging method based on difference of wave velocity between zero mode component and aerial mode component of traveling wave. It analyzed theory of traveling wave ranging in details, expounded measuring method for wave velocity of aerial mode and zero mode. By the simulation of ideal condition and existence of transitional resistance confirmed effectiveness and feasibility of the method.