Casualty Power Distribution System

Figure 3-19.-Bus the connections on 400-Hz ship’s service system. (STC 1 thru STC 4). Each is rated at 150 KW at 0.8 power factor (fig. 3-20) and distributed to 400 Hz loads through two distribution switchboards, designated 1SF and 2SF. Both distribution switchboards provide for centralized distribution of 450-volt, three-phase, 400-Hz power. Each switchboard is also capable of controlling and monitoring converter input, converter output, and bus tie circuit breakers. CASUALTY POWER DISTRIBUTION SYSTEM Damage to ship’s service and emergency distribution systems in wartime led to the development of the casualty power system. This system provides the means for making temporary connections to vital circuits and equipment. The casualty power distribution system is limited to those facilitues necessary to keep the ship afloat and permit it to get out of the danger area. It also provides a limited amount of armament, such as weapons systems and their directors. Optimum continuity of service is ensured in ships provided with ship’s service, emergency, and casualty power distribution systems. If one generating plant should fail, a remote switchboard can be connected by the bus tie to supply power from the generator or generators that have not failed If a circuit or switchboard fails, the vital loads can be transferred to an alternate feeder and source of ship’s Figure 3-20.-400-Hz electric power distribution system. 3-13