Electromagnetic Force Analysis of a Power Transformer Under the Short-Circuit Condition

Due to the high costs and difficulties to make the short-current experiment of large power transformers, it is critical to do the electromagnetic force analysis of the transformer windings through finite element software. Research in this paper establishes the analysis model of a 50000 KVA/110 KV three phase power transformer. In previous studies, short-circuit impedance is seldom evaluated for its effect to the accumulated effect of the electromagnetic force. A novel approach with considering of the short-circuit impedance is proposed to simulate the accumulated deformation. Short-circuit current is applied to this model, testing the electromagnetic forces of the transformer windings. Results of the research is significant to the evaluation of winding deformation state.