A synthesis fault phase selector for double circuit lines on the same tower based on steady values

Used the six-sequence fault component,the action of some phase selectors,including the phase current difference suddenly-change and the sequence current were analyzed in this paper.Based on the future of degrees between fault phase for cross-country fault and the directional component,a synthesis fault selector using steady values in single circuit at single side for double circuit lines on the same tower is proposed.With the multi-phase channels and fault phase selection results at both sides,the relay may cut off the fault phases.At last,the simulation results prove the method is correct and valid.