A kind of 220kV harmonic isolation transformer with four winding

In order to solve the problem of harmonic content exceeding normal standard in some transformer substations, this paper puts forward a four-winding transformer with the function of harmonic suppression. The filter winding will isolate 220kV winding from 110kV and 35kV windings, and to constitute two sets of inductive filter transformer structure. Respectively, to meet the inductive filtering requirements of 110kV and 35kV sides, realizing harmonic isolation. Then, to establish the simulation model of four-winding transformer in the software of PSCAD. Compared to the 220kV three windings transformer and filter system, simulation results show that the new transformer with the filter system can achieve harmonic suppression and reactive power compensation on 110kV and 35kV sides, and with the good effect.