Research on topological structure and simulation of hybrid DC circuit breaker

At present, the hybrid DC circuit breaker (ABB company's Hybrid DC circuit breaker as the representative scheme) must be equipped with the radiator because of a long‐time current passing through the power electronic devices in the load‐control‐switch (LCS). Therefore, the daily operation and maintenance work is increased, and the reliability of the whole circuit breaker is reduced，in order to solve the problem, a topological structure of hybrid DC circuit breaker was designed here. This design combines two current transfer ways. When circuit need to be cut‐off, current transfer was from main branch to the branch of LCS, and then to the solid‐state switch branch in which the current was cut‐off by series of power electronic devices. A simulation model was built on PSCAD to verify the feasibility of this topological structure.