Low-Frequency Electromagnetic Transient Modeling of Shell-Type Transformers Based on Dynamic Jiles-Atherton Hysteresis Model

Transformers often encounter electromagnetic transients, such as ferromagnetic resonance and inrush currents. An accurate low-frequency modeling of transformers is essential for analyzing power system faults. However, the lack of accurate magnetic characteristic modeling in most commercial software results in the electromagnetic transient calculations of the shell-type transformer remaining challenging. In this article, a low-frequency shell-type transformer model for analyzing electromagnetic transients is proposed. By combining the static Jiles-Atherton (J-A) hysteresis model with loss separation theory, a modified dynamic J-A hysteresis model is established. The nonlinear excitation inductance module considering loss and hysteresis characteristics is developed. An improved topology-based shell-type transformer model is established based on the duality principle. The inrush current test results of shell-type transformers verified the accuracy of the proposed model.