Research on Harmonic Diagnosis Technology and Device Development of Coal Mine Electrical Equipment

In view of the time-varying harmonic problem existing in the coal mine, two methods of segmented FFT transform and wavelet packet transform are used to detect the time-varying harmonic. Based on the research on the power quality index and harmonic generation mechanism of the key power supply equipment of the underground branch power grid in the coal mine, combined with the actual production of the coal mine, a practical and effective power quality detection method is proposed, and an intelligent diagnosis system for the health status of the power supply equipment in the coal mine is developed. Through the real-time monitoring of the harmonic parameters of the power grid, the operating parameters of the power grid, and through the comprehensive analysis and judgment of the working status of the equipment of the underground power grid, the system can achieve the comprehensive judgment of the fault of the key equipment of the underground branch power grid and achieve the purpose of fault location and early warning.