Patent ID: 7982341

Claim:
A transformer operation control apparatus, comprising: a transformer connected to a three-phase electric power system; a breaker connected between said electric power system and said transformer and being capable of shutting off and applying a current for each phase of three phases; a first voltage measuring portion measuring a voltage of each phase, on a side of said electric power system, of said breaker; a second voltage measuring portion measuring a voltage of each phase, on a side of said transformer, of said breaker; and a control portion receiving an opening command and a closing command, and controlling timing for shutting off and applying the current for each phase by said breaker, wherein when said control portion receives said closing command, said control portion exerts control so that said breaker applies a current of a first phase among the three phases at a target apply time point determined based on measurement values of said first and second voltage measuring portions, and said control portion determines whether or not a determination condition for verifying a suppression effect on a magnetizing inrush current is satisfied, when said determination condition is not satisfied, said control portion exerts control so that said breaker shuts off the current of said first phase and again applies the current of said first phase at the target apply time point determined again based on the measurement values of said first and second voltage measuring portions, and said control portion determines again whether or not said determination condition is satisfied, and when said determination condition is satisfied, said control portion exerts control so that said breaker applies currents of the other two phases except for said first phase.