Intelligent Control Technology of Tripping and Reclosing for Double-circuit Transmission Line on the Same Tower

Intelligent control technology of tripping and reclosing is present for double-circuit transmission line on the same tower aiming at solving the problems existing in reclosure commonly used nowadays. Way of only tripping faulty conductor(s), which can enhance the power transmission on condition of fault, is applied for each fault type. Identification of transient and permanent fault based on fault point voltage is carried out after tripping. If permanent fault occurs, the whole fault circuit(s) is(are) opened and reclosure(s) is(are) locked; if transient fault occurs, reclosing scheme in phase order is started. Breaker of the remote terminal operates first when reclosing each phase; each reclosing time delay is set at the optical reclosing time in order to damp out the oscillation and stabilize the system; reclosing angle is set at the ideal angle for decreasing transient aperiodic component of the second short circuit current.