Patent ID: 6489773
Filing Date: 2002-12-03
Classification: H01H

Abstract:
A method for determining when two or more voltage phasors across an open circuit breaker are separated in phase by an amount substantially corresponding to the predetermined amount of time (tBCT) it would take for the breaker to close after receiving a close command, thus enabling the issuance of a close command in anticipation of the breaker closing such that, when the breaker closes, the two or more voltage phasors will be in substantial synchronization, comprising:(a) determining a plurality of sample values of slip frequency (&Dgr;f) with units of degrees/x-cycle and degree separation (&Dgr;&phgr;) with units of degrees, wherein x is a predetermined number; (b) for the sample values, determining the ratio of &Dgr;&phgr;/&Dgr;f; and (c) when the ratio of &Dgr;&phgr;/&Dgr;f=tBCT, issuing a close signal to the circuit breaker.