Patent ID: 8878391
Filing Date: 2014-11-04
Classification: H02H

Abstract:
1. A pre-fluxing system for a three-phase transformer to reduce inrush current in the three-phase transformer having first A, B and C phase windings, second A, B and C phase windings, and a magnetic core having A, B and C segments associated with the first and second A, B and C phase windings, respectively, comprising: a three-phase line circuit including a three-phase line breaker for applying line voltage to the three-phase transformer; a pre-fluxing capacitor; a direct current source for charging the pre-fluxing capacitor; a charging circuit for connecting the direct current source to the pre-fluxing capacitor and charging the pre-fluxing capacitor to a predetermined voltage level; a pre-fluxing circuit for connecting the pre-fluxing capacitor to two first windings of the first A, B, and C phase windings; and a control circuit for controlling a closing of the three-phase line circuit to apply line voltage to the three-phase transformer coincident with a positively-referenced voltage peak of a phase associated with a pre-determined winding.