Simulation Analysis of Inrush Current and Electromagnetic-Force Characteristics of Converter Transformer During No-Load Closing

Analyzing the electromagnetic and mechanical characteristics of a converter transformer under inrush current is extremely important in order to develop an appropriate closing strategy and provide guidance for core degaussing. Using the no-load closing of a converter transformer as an example, this paper employs Simulink to construct a simulation model of inrush current. It then examines the inrush current characteristics of the converter transformer with different remanence and closing phase. Additionally, a finite element simulation model is created to investigate the iron core's saturation characteristics. By utilizing the electromagnetic force coupling method, this research calculates the deformation and acceleration of winding under inrush current, thereby revealing the qualitative laws governing the electromagnetic characteristics of the core and the deformation of the winding.