Patent ID: 8462474
Filing Date: 2013-06-11
Classification: H02H

Abstract:
1. A reclosing system for a power transmission line, which performs high-speed reclosing using protection relays, the protection relays being provided at different terminals of the power transmission line, each of the protection relays comprising a protection calculation function and a reclosing function, the protection calculation function being configured to receive voltage signals detected by a metering voltage transformer and current signals detected by a metering current transformer to execute a predetermined protection calculation to thereby cut off a phase with an accident on the power transmission line, the reclosing function being configured to output a reclosing command to a circuit breaker when the phase with the accident becomes to satisfy a reclosing condition, wherein each of the protection relays comprises means for sending the reclosing command to the circuit breaker when a line voltage at the phase with the accident, detected by the metering voltage transformer after the phase with the accident is cut off, falls within an allowable range, the allowable range being determined based on a line voltage assumed at the phase when the phase is normal.