Abstract:Conventional single-phase reclosing mode cannot identify instantaneous fault and permanent fault, when reclosing permanent fault, will increase an impact related to system or equipment, and is likely to lead to DC commutation failure. An adaptive reclosure criterion of double-circuit line is proposed, which only require single line information and have engineering practicability. The criterion uses the voltage of fault point, calculates the action threshold in real time through the capacitance parameters and the relationship between capacitance coupled voltages under various fault types to eliminate the fuzzy zone caused by the line capacitance parameter and fault type, introduces an auxiliary criterion and sets the reset time reasonably to eliminate the fuzzy zone caused by the cross-line non-earth fault. The simulation results show that the adaptive reclosing criterion is applicable to various types of failures that may occur on double-circuit line.