부산대학교 도서관

This paper elaborates the significant advantages of a T-Type Modular DC Circuit Breaker (T-Breaker) built with full-bridge silicon carbide (SiC) switching cells, accompanied by the presentation of a prototype rated at 20 kV, 50 A. The challenges in submodule design are overcome by incorporating a gate drive with high common-mode transient immunity and robust insulation capability, a PCB busbar designed for high conduction current and voltage insulation, and a compact thermal management system. The proposed functionalities of the full-bridge module based T-Breaker (FB T-Breaker) have been validated. The FB T-Breaker is capable of interrupting a 500 A current, whilst also exhibiting tolerance to control signal misalignment. The T-Breaker’s efficiency registers at 99.977% at 50 A rated current, and it achieves a power density of 60.2 MW/m 3 at 250 A maximum continuous operating current.