Research on Vibration Characteristics of Inter-turn Short Circuit on Secondary Side of Amorphous Alloy Transformer Winding

Transformer is the core equipment in power system, because of its interturn short circuit fault often affects the stability and safety of transformer work, so the analysis of transformer core saturation characteristics has important practical significance for transformer fault diagnosis and protection. In this paper, Ansys/Maxwell was adopted to model the amorphous alloy transformer SBH15-M-400/10. After verifying the accuracy of the model, short circuit occurred in the secondary side windings of the transformer with different turns and at different positions of turns with the same number and test. The results show that when the interturn short-circuit fault occurs in the secondary side winding of the transformer, the short-circuit turns winding will generate a short-circuit circulation several times the rated current, and the short-circuit turns increase with the increase of the number of short-circuit turns. When the short-circuit position and the number of short-circuit turns change, the current of the high-voltage normal winding is little affected, while the iron core has a large vibration. The conclusion can provide support for the visualization of transformer digital twinning.