FAST THREE-PHASE RECLOSING METHOD IN SHUNT REACTOR COMPENSATED TRANSMISSION LINES

摘要

The present invention describes an adaptive switching method to control overvoltages due to three-phase reclosing of shunt compensated transmission lines (TL). After circuit-breaker (CB) trips a line, the interaction between TL transversal admittance and the inductance of inductive reactive compensation makes the voltage between CB poles assume an oscillatory form (beat). The optimal region to reclose the CB corresponds to the region where the amplitude of the beat voltage across the CB is minimum. The method developed presents major reliability in determining the first minimum beat voltage region, independently of voltage zero crossing. This proceeding also allows higher time margin to operate the CB once the optimal region detection for reclosure is obtained with several fundamental frequency cycles in advance. This method should be incorporated in the control logic of a TL three-phase reclosure digital relay generating a new digital relay for an adaptive three-phase reclosure for shunt compensated transmission lines.