| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a magnetization rush current suppression device which can control the closing phase for suppressing magnetization rush current of a circuit breaker that opens/closes connection of a three-phase AC power system including a power supply and a grounded transformer for converting the three-phase AC voltage into a single-phase AC voltage. <P>SOLUTION: A magnetization rush current suppression device 6 which suppresses a magnetization rush current of a circuit breaker 2 that opens/closes the connection of a power supply bus 1 and a grounded deformation Woodbridge connection transformer 3 for each phase calculates the steady-state flux of the transformer 3 by measuring the three-phase AC voltage of the power supply bus 1, and calculates the residual flux of three-phases of the transformer 3 after interruption by measuring the single-phase AC voltage of the transformer 3. The circuit breaker 2 in a phase having the maximum value of residual flux is closed in a phase where the steady-state flux matches the residual flux, and the circuit breakers 2 in two remaining phases are closed in a phase where the phase voltage of the closed phase becomes the zero point upon elapsing a preset time. <P>COPYRIGHT: (C)2013,JPO&INPIT |
