Fault property identification before reclosing can overcome the secondary impact problems caused by the reclosing of the three-phase automatic reclosing in the traditional distribution network when the permanent fault occurs. Some scholars have proposed the use of split-phase switches to identify fault property

but there are problems such as low sensitivity of fault property identification or influence of neutral point grounding mode. Based on the split-phase switch

this paper further proposes permanent fault identification method for grounding faults and phase-to-phase faults

and gives the sequential reclosing scheme. Firstly

the analysis model of sequential reclosing is established

and it is verified that the fault current impact of reclosing one phase is much smaller than reclosing three-phase. Secondly

for the grounding faults

the zero-sequence impedance expressions for different fault types are derived

the difference of zero-sequence impedance angle characteristics between transient fault and permanent fault is analyzed

and the identification criterion of permanent grounding faults is constructed. For phase-to-phase fault

the difference of line voltage characteristics between transient fault and permanent fault is analyzed. The fault property identification criterion based on average Hausdorff distance algorithm is proposed. Finally

the influences of load capacity

transition resistance and system capacitance current change on the proposed method are analyzed

and the sequential reclosing scheme is given by combining the algorithms. The closed-loop test experiment based on RTDS shows that the proposed permanent fault identification scheme can reliably identify the fault property

has the advantages of robust tolerance to transition resistance

and is not affected by the neutral point grounding mode.