Electrical faults in the shipboard power system can result in the loss of power to critical loads of the system because todays electrical systems protection devices cannot clear faults in less than a cycle or two. The result is that very high current flow in the system. In this Phase I SBIR, we propose to develop an initial concept to limit the fault current magnitude by interrupting the current in less than 100 s from onset of fault. To accomplish this we propose to use a fast opening mechanical contactor with solid-state switches in parallel. The fast opening mechanical contactor is actuated by magnetic forces and can interrupt fault current in 100 s. This concept was proven at the 440 V system level, and we are proposing to extend it to the medium voltage level. The successful development of this technology will provide revolutionary new capability in system protection and load survivability.
Benefit: The successful development of this technology will provide revolutionary new capability in system protection and load survivability on ships. Limiting fault current by fast fault detection and interruption in less than 100 microseconds will have a large positive impact on the remaining system components. The proposed concept has a large potential military and commercial application. If successful, it will enhance future combatant ship survivability, and reduces size and weight of the whole power distribution system. Potential commercial applications reside in the power industry and in industrial markets where power interruption is detrimental to their products.
Keywords: 100 s Fault Current Interruption, 100 s Fault Current Interruption, High Current Faults, Medium Voltage Power Distribution, fault current limiting
