Analysis of short circuit current of transformers in both mechanical and thermal ways

Abstract

When short circuit fault happened to a transformer, which current was current several times than the rated current, it would produce mechanical and thermal effect in the transformer winding. When the short-circuit resistance of the transformer was not enough, it may lead to axial or radial deformation of winding, weakening of winding strength, decreasing of insulation performance and other problems. Therefore, it is necessary to make a comprehensive analysis of mechanical and thermal effect in order to judge the overall state of the transformer after short circuit fault and ensure the safety and reliability of power grid.