Abstract:The non-linear load borne by power transformers during operation is significant, leading to a significant increase in the leakage magnetic field between transformer windings, which seriously affects the transformer"s ability to withstand short circuits.Moreover, in recent years, transformer damage incidents have occurred frequently due to insufficient short-circuit resistance. Therefore, it is particularly important to accurately calculate the level of short-circuit resistance in advance for the safe operation of transformers.This article analyzes the calculation principle of transformer short-circuit current and electromagnetic force computer theory, introduces a transformer short-circuit resistance verification system based on WELLINST, and analyzes the design principle, main input parameter types, core criteria, and applicable scenarios of the system.And use the system to verify the short-circuit resistance of 110kV and 220kV power transformers based on their original design parameters and design parameters after returning to the factory for maintenance, in order to achieve the goal of revealing the risk of insufficient short-circuit resistance of transformers in advance and controlling the quality of newly connected main transformers.