Transverse differential protection scheme for double‐circuit lines with single‐pole tripping and reclosing

Summary A new transverse differential protection scheme with current‐based directional element enabling selectivity in the case of single‐pole tripping and reclosing is proposed for double‐circuit lines. No communication channel and voltage signals are required for proper operation of the protection. Selectivity of the proposed protection scheme is tested for both doubly fed and singly fed double‐circuit lines. Line with no fault and healthy phases of faulted line remain in operation during fault clearance time in such a way enhancing power system stability. A special single‐pole reclosing success indicator is proposed for differentiation between transient and permanent faults. After single‐pole reclosing event, selectivity of the protection is achieved using currents of healthy line as polarizing quantities. Selectivity testing is performed by extensive simulations of various fault events in the case of both doubly fed and singly fed untransposed double‐circuit line models using visual interactive simulator developed in MATLAB/Simulink.