The short-circuit withstand capability of power transformers is one of the key indicators reflecting the level of transformer manufacturing and the reliability of transformers. To address the issues that the results of stress and displacement calculated by the existing disk-type finite element model structure are small and lacking in test verification. This paper proposes a finite element evaluation method based on a conductor-turn insulation model to solve the problem of the accurate calculation of deformation and stress in transformer windings under short-circuit conditions

and a 40 000 kVA/110 kV power transformer is used as the research prototype to verify the proposed method. Firstly

tensile tests on paper insulation were conducted to determine the parameters of the conductor-turn insulation model

and the "electromagnetic-structural" finite element method is applied to calculate the leakage flux

electromagnetic force

deformation and stress when the medium voltage (MV) winding experiences a symmetrical short-circuit under high voltage (HV)-MV rated operation conditions. Next

the analytic formulas for stress on ordinary conductors

self-adhesive continuously transposed conductor and structural parts are derived

a transformer short-circuit withstand capability verification software is developed on the basis of the axisymmetric finite element method and analytical methods to perform the calculation of winding leakage magnetic fields and electromagnetic force loads

as well as the verification and assessment of winding stability. Furthermore

the sensor elements such as magnetic leakage are arranged in the winding area and the leakage flux test of the prototype is carried out. The results reveal that the accuracy of the proposed method and the software calculation is verified by the results of leakage flux test and the actual deformation of the winding. The proposed method and the software can realize the rapid and accurate evaluation of the short-circuit withstand capability of the transformers.