Zero volt switching hybrid DC circuit breakers

DC distribution networks have the advantage of easy connection of generators of different frequency, fuel cells, and storage devices like batteries and flywheels to a grid and the advantage of a lower current load of the cables. Despite these advantages, often an AC distribution network is chosen because of the lack of reliable DC switchgear. In this paper, zero current and zero volt switching hybrid DC circuit breakers are described and discussed. The construction of a 6 kA/600 V zero volt switching hybrid circuit breaker, with an opening time of 200 /spl mu/s is explained and simulation and test results of a 1 kA experiment are discussed. The concept of a zero volt switching hybrid circuit breaker is further improved by using high-density power electronic technologies.