Patent ID: 9515479
Filing Date: 2016-12-06
CPC Classification: H01H,H02H

Claim Text:
1. An inrush current suppression apparatus that suppresses an inrush current generated when three phases of shunt capacitors are connected at the same time to a three-phase alternating current power system on a power source side by a three-phase collective operation type circuit breaker which collectively operates three phases, the apparatus comprising: a power source voltage measurement unit configured to measure power source voltages which are voltages on the power source side of the circuit breaker; a circuit breaker current measurement unit configured to measure circuit breaker currents which are currents flowing through the circuit breaker; a residual voltage polarity determination unit configured to determine the polarities of phase-to-phases of residual voltages on a shunt capacitor side of the circuit breaker after the opening of the circuit breaker in accordance with the circuit breaker currents measured by the circuit breaker current measurement unit; a closing phase section detector configured to detect a closing phase section in which the polarities of phase-to-phases of the residual voltages determined by the residual voltage polarity determination unit match the polarities of phase-to-phase voltages of the power source voltages measured by the power source voltage measurement unit, respectively; and a circuit breaker closing unit configured to close the circuit breaker within the closing phase section detected by the closing phase section detector.