Study on adaptive reclosure criterion based on mutual distance algorithm

Abstract

When single-phase grounding fault occurs on a transmission line with shunt reactors, due to the difference of the recovery voltage between transient faults and permanent faults, the relationships of the fault phase recovery voltage and the voltages of shunt reactors and neutral reactors are deduced. Criteria for the self-adaptive reclosure based on the value of mutual distance function are presented. The proposed criteria use the difference of the voltage on reactor shunt and neutral reactor in the fault phase at the same time to determine the fault type. If there are big differences, the calculated mutual distance function values are large, the fault is judged to be transient fault, and on the contrary it is judged to be permanent fault. ATP-EMTP simulation results showed that the criterion can determine the type of single-phase grounding fault on the transmission lines with shunt reactor simply and accurately.