Compound Elimination Method of Potential Transformer Ferroresonance in Distribution Network

In distribution network, single-phase fault is easy to cause the ferroresonance in potential transformer (PT), a compound elimination method of PT ferroresonance is proposed. Firstly, the principle of PT ferroresonance after single-phase fault is analyzed. Secondly, two ferroresonance elimination methods, including adding damping resistance at PT open delta winding and neutral grounding through resistance, are introduced. A compound elimination method of PT ferroresonance controlled by the insulated gate bipolar transistor (IGBT) is proposed. Finally, the PT ferroresonance model of 10kV distribution system is established by PSCAD/EMTDC software. The effectiveness of the compound elimination method of PT ferroresonance is simulated. The simulation results show that the proposed elimination method can effectively suppress ferroresonance.