For main protection and backup protection integrated 220 kV transformer, star connection must be adopted in each secondary side of the transformer. The method of software varying phase is widely used for current phase compensation, which can't be used directly for some transformer such as YNd5 wiring transformer. A method, that can transfer the phase of the secondary wiring with YNd5 wiring to the phase of the secondary wirering with YNd11 wiring, is proposed in this paper. Then current phase compensation can be applied to the transformer with YNd5 wiring. This method has been successfully adopted on a customer substation, and the loading test result shows that the current phase relation between high and low voltage is as expected.