In order to solve the abnormal phenomenon of the unbalanced rate of the bus electricity after the reconstruction of the 220kV booster station in Fenyi power plant

the paper analyzes the reason for the error of the three-phase three wire system in the case of the unbalanced load after the reconstruction

and puts forward the transformation of the three-phase three wire system into the three-phase four wire system to reduce the unbalanced rate of the electricity. The measurement of the electricity after the reconstruction is consistent with the theoretical analysis results

and the unbalanced rate reaching the standard.