The exciting inrush current possibly generated in the closed operation of power transformer will seriously affect stable operation of power system. The realization of existing phase selection strategy is limited to the control accuracy and remanence measurement method. According to the variation of exciting current in case of variation of closed angle of transformer

a range of remanence is existed

keeping the transformer close at a larger range of closing angle without exciting inrush current. The use of DC magnetizing circuit with the modified control strategy can keep transformer's remanence in this range. When the remanence is 0.7 to 0.8 of the rated remanence which is obtained by the simulation of J-A model in Pscad

the the maximum closing angle range is existed. The use of DC magnetizing circuit to magnetize 0.021 s to 0.022 s can make the transformer's remanence in the above-mentioned range. The results show that the method can adjust the remanence of transformer core to the specified range

the magnetizing circuit does not need to adjust the control parameters according to the actual situation

and the large range of closing angle can reduce the control precision of phase selection closing and effectively suppress the exciting inrush current.