A Method for Dealing with Single-Phase Grounding Faults Based on Phase-Controlled Pre-Coordinated Arc Suppression Coil

In order to improve the processing ability of single-phase grounding faults in distribution network cable lines, a method of defining cable and overhead line faults using the size of transition resistance is proposed based on the characteristic of low resistance faults in cable lines. The calculation expression of transition resistance used in conjunction with phase-controlled pre-coordinated arc suppression coil is derived. The transition resistance measurement method is verified by digital simulation, and the relationship between damping rate, out-of-resonance, capacitance current and capacitor current observation error and transition resistance measurement error is analyzed in detail. Finally, the transition resistance measurement method was validated through real type experiments, and the results showed that this method can effectively distinguish between high resistance faults and low resistance faults, that is, cable faults and overhead line faults.