Research on on-line insulation monitoring and fault location method of mine power supply XLPE cable

Due to the dust, humidity and many other causes, the mine cable insulation will decrease gradually. This would cause leakage accidents and cable single-phase ground fault and then endanger the safety of the coal mines and workers. In order to solve above problems, this paper proposed a coal mine on-line insulation monitoring and fault location method. The way to achieve the goal is by superimposing a different frequency signal (DFS). When the operation of the cable is normal, it will monitoring the insulation condition of mine cable on-line, and when a single-phase ground fault occurs it will convert to locate the point of fault automatically. It combines the insulation monitoring and fault location in one system. The ATP/MATLAB simulation results show the feasibility and effectiveness of the method.