Method and system for determining insulation strength of transformer wire outlet device

The invention discloses a method and system for determining the insulation strength of a transformer wire outlet device. The method comprises the steps that a transformer wire outlet device calculation model is determined; calculating an electric field value based on the transformer outgoing line device calculation model to obtain key path electric field data; wherein the electric field data of the key path comprises position information and an electric field value corresponding to each path point in the key path; calculating the allowable field intensity corresponding to each path point according to the position information, and determining the insulation intensity of the transformer outlet device according to the allowable field intensity and the electric field value corresponding to each path point. According to the method, reasonable equivalence and simplification are carried out on an actual assembly structure, a voltage-sharing ball equipotential surface and a ground potential surface are constructed an