642 / 2019-04-14 14:28:01

A Single-phase Adaptive Reclosing Fault Identification Scheme Based on Phase Characteristics of Shunt Reactors

Phase difference, single-phase adaptive reclosure, shunt reactors, transient fault, transmission lines

Aiming at the problem that the fixed-time reclosure of the transmission line is blindly coincident with the permanent fault, a single-phase adaptive reclosure scheme is proposed, which uses the phase information of the disconnected phase shunt reactor to identify the fault. The scheme analyzes the phase relationship between the voltage and current of the shunt reactor in different fault conditions in detail. Under transient faults, the phase difference is stable at 90° while it changes greatly under permanent fault and it is obviously different from the phase relationship under transient fault. Finally, the phase information is obtained by using the power frequency phasor extraction algorithm. The simulation results show that the scheme is simple and accurate which is almost independent of fault location, line compensation and transition resistance and the scheme is suitable for single-ended and double-ended transmission lines with shunt reactors.