Short-Circuit Performance Evaluation of Composite-Core Transformer Windings

Abstract

Power transformers serve as critical equipment for voltage level conversion in power grids. Short-circuit faults in distribution transformers can lead to severe winding damage, making the analysis of short-circuit withstand capability an essential research aspect. This paper investigates the short-circuit withstand capacity of a three-phase five-limb transformer constructed with a hybrid silicon steel/amorphous alloy composite core. Using the Ansys Maxwell platform, a finite element model was established to analyze the short-circuit characteristics of the composite material transformer. Key parameters including short-circuit impedance, maximum short-circuit impact current, and leakage magnetic field distribution were systematically calculated and evaluated. The study provides a theoretical foundation for research on the short-circuit withstand capability of composite material transformers.