The inter-turn insulation state of power transformer windings is closely related to its safe operation level. Revealing the multi-physical field characteristics of the winding during a single-turn short-circuit fault is beneficial to obtaining information about the inter-turn insulation state to avoid equipment damage accidents. Aiming at the difficulty in setting the series of single-turn short-circuit faults in transformer windings in the actual test research

we adopted the ANSYS Electronics Desktop finite element simulation software to establish a "field-circuit" coupling model consistent with the actual transformer

and introduced the Workbench collaborative simulation platform to perform "electromagneticstructure" and "electromagnetic-thermal" multi-physics coupling simulation analysis. Moreover

by setting a single-turn short-circuit fault in the secondary winding at a certain time in the external circuit of the transformer model

we performed the simulation study of the electromagnetic

mechanical

and temperature and other physical parameters of the faulty transformer

and investigated the distribution law and the winding force under the fault condition. Meanwhile

through the analysis of the turn loss and the temperature rise of the winding

it is found that the damage of the turn-to-turn short-circuit fault to the transformer mainly lies in the insulation degradation caused by the loss and temperature rise rather than the force deformation. Therefore

the measures can be taken to improve the short-circuit resistance of power transformers in the application. The results can provide theoretical basis for the research on on-line detection and protection technology of inter-turn short circuit faults.