Abstract
As an emerging type of electrical equipment, design and testing of DC circuit breaker face enormous challenges. Hybrid DC circuit breaker is one of mainstream design solutions, and its commutation branch is normally based on power switches typically press-pack IGBTs. The characteristics of IGBTs are generally well understood for converter applications, however special setup or arrangement for IGBTs are needed when they are used in a DC circuit breaker, so that they can withstand and turn off very high DC short circuit fault current. This study starts with general working principle of DC circuit breakers, and then introduces core requirements on press-pack IGBTs when used in the commutation branch of a hybrid DC circuit breaker. Furthermore, by looking into internal structure of press-pack IGBT, manual calculation and simulation analysis of IGBT junction temperature and lab bench demonstration testing, key measures or arrangement for press-pack IGBT in DC circuit breaker application have been studied. Finally, the full-scale testing from a third party, in which a 19kA DC fault current is turned off using a single 4.5kV/3kA press-pack IGBT, proves effectiveness of proposed key measures for press-pack IGBT when used in DC circuit breakers.
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