Phase control switch apparatus

Details Phase control switch apparatus Phase control switch apparatus

H - Electricity

02

H

H02H 7/00 (2006.01) H01H 9/56 (2006.01) H02H 3/253 (2006.01) H02H 9/00 (2006.01)

Patent

CA 2326091

A phase control switch apparatus incorporating a phase-based break/make controller (80A, 80B, 80C) for protecting a reactive load such as a transformer (10) connected to a three-phase power supply from transient surge phenomena taking place upon power-supply breaking/making operation. The phase control switch apparatus includes a breaker (50) for closing/opening a transformer (10) connected to a three-phase power supply in .DELTA.-connection, actuator devices (54) for actuating phase contacts, respectively, of the breaker (50), a reference phase detecting unit (82) for predicting phases of the phase-voltage waveforms upon closing of the breaker contacts and phases of phase-current waveforms upon opening of the breaker, a residual magnetic flux detecting unit (83) for predicting residual fluxes in each phase of the transformer (10) on the basis of time points at which the breaker contacts of the individual phases were opened in the preceding breaking operation and polarities of the phase-currents immediately before the breakage, an arithmetic processing/operation control unit (81) for predicting optimal closing time points for the individual phases at which the transient surge can be suppressed to a minimum on the basis of the predicted residual fluxes, and a processing/operation control unit (81) for starting the breaker contact closing operation at the predicted optimal closing time point.

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