The ST25-30 portable intelligent cable fault location system is suitable for fault detection of 380V-35kV power cables. It can detect difficult faults such as low resistance, high resistance, broken wires, flashover, and intermittency. The system integrates the high-voltage source, high-voltage capacitor, TDR pulse reflection module, and fully automatic control circuit required for cable fault location system, reducing operation difficulty, reducing volume and quality, and enhancing safety protection level; Built in large capacity rechargeable battery, suitable for harsh outdoor operations.