Phase Selector And Fault Location For Double Circuit Lines On The Same Tower

The double circuit lines on the same tower requires narrow corridors, the transmission on ability is strong, and investment is saved. Thereby, it is used by power system more and more. Considering the zero sequence mutual inductance, a novel accurate fault location algorithm using two terminal for double circuit lines on the same tower is presented in this paper, this method eliminate the influence of source impedances and fault resistance. Used the six sequence fault component, the action of some phase selectors 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 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. In addition, the rule of variations measuring impedance of distance relay when cross country faults occurs between the double circuit lines on the same tower.