In order to solve the problems about the detection and quick isolation of single-phaseearthing faults in a small current grounding system

an earthing fault treatment scheme is proposed based on primary and secondary integration technology of distribution network. Through a complete set of primary and secondary fusion equipment and wavelet packet transient zero-sequence line selection technology

and combined with the use of incoming call closing

voltage free opening

closing on fault accelerated tripping

fault path priority and other strategies

the problems of single terminal line selection under multi-branch and multi-power supply modes are effectively solved. At the same time

combined with on site application cases

it is proved that the proposed scheme can quickly realize the location and isolation of ground fault zone and has universal applicability.