Design of Medium-Voltage High-Frequency Transformers Based on High-Thermal-Conductivity Insulation Material

Medium-voltage high-frequency (MVHF) transformers are significant for isolated DC-DC converters in solid-state transformers (SST). In this paper, it is proposed to use high-thermal-conductivity insulation material in MVHF transformers to satisfy both insulation and thermal requirements. Design methods are proposed for this type of transformers, including the overall design procedure, the insulation design and the thermal design. Based on the proposed design methods, downscale transformers are designed with four types of insulation material and a 60 kVA transformer is designed with one type of high-thermal-conductivity insulation material. Simulations are performed to evaluate and compare the design schemes. Prototypes are developed according to the design schemes and are tested in experiments.