Traveling wave fault location method and system for latent fault of medium-voltage distribution cable

The invention discloses a medium-voltage distribution cable latent fault traveling wave fault location method and system, and relates to the technical field of relay protection, and the method comprises the steps: collecting a fault traveling wave signal through traveling wave fault location equipment, extracting a high-frequency component of the fault traveling wave signal through S transformation, and obtaining a traveling wave arrival time; a correlation analysis method is adopted to determine the time difference of the fault traveling wave reaching the two ends of the cable, and the distance between the fault and the bus equipment is calculated and verified. According to the invention, the fault traveling wave signal frequency domain analysis is realized, and the distance measurement precision is improved. The distance measurement efficiency is improved, and the traveling wave arrival time difference is calculated by adopting a correlation analysis method. The method improves the applicability, constructs