Abstract

DC fault current breaking devices are important components for enabling robust protection of the dc system. This chapter will present the ongoing developments regarding the dc fault isolation devices. There are two major trends in dc fault isolation, namely based on, dc circuit breaker (DCCB) and converter-based solution. Firstly, the DCCB will be presented with active and passive commutation. This will be followed by hybrid DCCB and converter-based isolation devices. Finally, commercially available DCCBs at high, medium and low voltage levels are presented.

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