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

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.