Heat dissipation design and research of all-solid-state DC circuit breaker based on IGCT

In this paper, a forced air cooling all-solid-state DC circuit breaker (voltage level DC750V, rated current DC1000A) for low-voltage distribution system is developed. Its core heating component is IGCT assembly, which consist of 2 IGCTs in parallel and 2 IGCTs in reverse parallel, then assembled with a radiator, which is composed of press-blocks, gravity heat pipes and heat fins. The test results show that the heat dissipation scheme can meet the requirements of all-solid-state DC circuit breaker.