基于电桥法的煤矿高压电缆绝缘电阻在线监测

Insulation Resistance On-line Detection of Coal Mine High Voltage Cable Based on DC Bridge Method

摘要: 设计了一种基于直流电桥法的矿用电缆绝缘在线监测方案，阐述了直流电桥法的检测原理，分析了检测灵敏度，讨论了在线检测精度的影响因素。通过仿真实验验证了该方法的可行性和有效性，在实验室中进行了模拟试验，试验结果表明：直流电桥法适合于井下中性点经消弧线圈接地供电系统高压电缆绝缘电阻在线监测。

Abstract: The article designs an on-line monitoring scheme for mine cable insulation based on DC bridge method, discusses and analyzes the detection principle and sensitivity of DC bridge method and discusses several influence factors of online detection accuracy. Its feasibility and availability are verified by simulation test. The experimental results in the laboratory indicate that DC bridge method is suitable for insulation resistance online monitoring of mine high voltage cable in the supply line of the neutral point by arc-suppression coil grounding.