Operational failure mechanisms of electromagnetic potential transformer

Abstract In response to the problem of transformers blowing up or even burning together with detuning devices in recent years, an assessment method based on equivalent transformer winding currents is proposed for potential (Potential Transformer, PT) low and medium voltage distribution networks. Firstly, damage mechanism analyzed thermal breakdown identified as main cause insulation. At same time, under different faults are theoretically identify characteristics various fault currents. Secondly, operational failure indicator equivalence, i.e. current threshold indicator, conjunction general specification. Finally, verified by means ATP simulation software combined tests. The results show that index can accurately reflect transformers, research provide a reference selection prevention insulation breakdown.