Patent ID: 6295188
Filing Date: 2001-09-25
Classification: H01H

Abstract:
A method of synchronously closing a hydraulically-controlled circuit breaker connected in an AC network by using a hydraulic control system and static switches, the method, for each pole of said circuit breaker, comprising:a) on receiving a closure order, controlling said static switches to begin closing said pole;b) waiting for a signal indicating that said pole has moved a certain distance between its open position and its closed position;c) on receiving said signal, controlling the static switches to cause said pole to stop closing and return to said open position;d) detecting when the network voltage passes through a zero value; ande) waiting for a calculated amount of time to elapse measured from said detection time, and then controlling the static switches to cause said pole to close, said time lapse being such that full closure of said pole takes place at a moment that substantially coincides with the instant at which the network voltage reaches a characteristic value.