Mine Cable Insulation Double-End Synchronous Monitoring with 5G Transmission Technology

For the neutral point non-effectively grounded system in coal mine power grid, the single-phase ground fault current is quite small, and the steady-state characteristics are non-significant. Therefore, it is quite difficult to detect a small current ground fault effectively, especially for a coal mine power grid. To facilitate single-phase ground fault diagnosis, this paper proposes a new cable insulation monitoring method taking advantage of the 5G transmission technology. This method can independently calculate and analyze the insulation state of each phase, and is not affected by the grounding type. In the proposed method, the 5G communication technology is applied to solve the underground signal transmission problem and realize GPS timing function underground. The underground cable insulation monitoring data can therefore be transmitted to the ground, and a cloud server can be set up for the signal analysis and corresponding calculation. The structure and key technologies of the proposed double-end synchronous monitoring method are analyzed. And the method is verified by simulation on a three-phase cable model. Factors that may cause relative errors corresponding to the actual measurements using the proposed method are discussed at the end of this paper.