| 摘要 |
A target closing phase determining circuit (8) determines energization flux errors in respective phases and respective closing phases of a first phase, and determines a target closing phase of the first phase so as to substantially minimize an evaluated value related to determined energization flux errors in the first to third phases, where each of the energization flux errors is the maximum value of absolute values of center values of transformer fluxes generated in a static state after energization. The target closing phase determining circuit (8) determines the energization flux errors in the respective phases and the respective closing phases of the first phase based on, residual flux values for the first to third phases of a three-phase power supply (2), respectively, a pre-arc characteristic and a closing time variation characteristic of a three-phase circuit breaker (3), a connection condition of windings of a three-phase transformer (1), to which the three-phase circuit breaker (3) is connected, and voltage phase differences among the phases of the three-phase power supply (2). A three-phase circuit breaker controller (9) controls the three-phase circuit breaker (3) to be closed at a timing corresponding to the target closing phase of the first phase. |
