Thermal Network Modeling of High Frequency Insulated Core Transformers

Abstract

The high frequency insulated core transformer (HF-ICT) accelerator is expected to replace the traditional insulated core transformer (ICT) for its small size and high power density in the field of irradiation below 1 MeV. As a key component of the accelerator, the ICT high-voltage power supply is used to feed the accelerator tube. The segmented core structure of the ICT will lead to the different magnetic flux of each core section. The nonuniform of power loss and structure results in the uneven temperature distribution of the HF-ICT. In this regard, a thermal model with highly accurate temperature prediction on the HF-ICT parts is required. A thermal resistance network based on the HF-ICT is proposed, considering the thermal coupling of the ambient, cores and windings. The multiphysics coupling analysis is carried out by COMSOL Electromagnetic Thermal Module and Nonisothermal Flow Module. Instead of linear materials, the measured B-P curve and B-H curve are applied for a more realistic simulation model. Finally, the thermal model demonstrates acceptable accuracy and small computational expense within the simulation results, which verifies the effectiveness of the proposed model.