Cascaded Commutation Circuit for a Hybrid DC Breaker with Dynamic Control on Fault Current and DC Breaker Voltage

This study proposed a cascaded commutation circuit based on current commutation approach for low-to medium-voltage DC fault current interruption, without snubber circuits, which slows the fault current di/dt prior to current-zero and the rate of rise of the transient recovery voltage dv/dt across the mechanical breaker contacts after current-zero. The proposed dynamic control of the fault current ...