In order to solve the problems of active intervention arc extinction device, such as PT inrush current, overvoltage after arc extinction and low start-up sensitivity for high impedance grounding faults, a new method which is the active intervention arc extinction device parallels with arc suppression coil is proposed in this paper. Its role for suppressing PT inrush current, post-overvoltage and significantly improving the start-up sensitivity is demonstrated. Effectiveness of the method is verified by experimental tests.

distribution network,single-phase grounding,active intervention arc suppression,arc-suppression coil,start-up sensitivity