OVERPOWER SENSING RELAY(LOAD SHED)
This relay prevents an overload of the generator by activating the load shed circuitry when the load on the generator exceeds 110% of the rated generator output (2,750 kW). It sheds load in two stages. Stage 1 will instantaneously activate when the generator output exceeds the setpoint for 100 millie seconds. Stage 1 loads are designated non-vital and include the galley, berthing ventilation, and laundry. If the 110% load remains for another 5 seconds after stage 1, stage 2 load shed will be activated. The stage 2 load shed will secure power to semi-vital loads such as the Air Conditioning plants, the Vertical Launching System heaters, Spy Heaters, and the Bridge window heaters.