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emergency backup power sources because they start quickly, can assume full load in only one or
two steps, and are less efficient than other prime movers. When there is a constant need for both
process steam (or hot water) and electricity, the gas turbine generator (with an exhaust heat
recovery system) may operate efficiently and continuously in a topping cycle cogeneration
configuration. Combustion turbine generator sets exhibit excellent frequency control, voltage
regulation, transient response, and behavior when operated in parallel with the utility supply.
1.6.7 Mobile Power Systems. One of the most important sources of emergency or standby
power is mobile (transportable) equipment. For most industrial applications, mobile equipment
will include only two types; diesel-engine-driven and gas-turbine-driven generators.
1.6.7.1 Ratings. Typical ratings of mobile generators range from kW to 2700 kW. Larger
power ratings are satisfied by parallel operation.
1.6.7.2 Accessories. Mobile generators come anywhere from a stripped down unit with
nothing but the prime mover and generator to units complete with soundproof chamber, control
panel, relaying, switchgear, intake and exhaust silencers, fuel tank, battery, and other required
operating and safety devices.
1.6.7.3 Navy Mobile Equipment. The Navy's Mobile Utilities Support Equipment
(MUSE) program provides specialized, easily transportable utility modules for short-term
support of shore utility systems. MUSE equipment includes generating units, substations, steam
boilers, water treatment plants, and auxiliary equipment. Policy, procedures, and guidance for
the management and use of MUSE are found in NAVFACENGCOM Instruction 11310.2.
Detailed technical and general application data for the equipment are provided in the MUSE
Application Guide, NEESA 50.1-001. Copies are available from Commanding Officer, Naval
Energy and Environmental Support Activity, Port Hueneme, CA 93043-5014.
(a) For power plants, the nominal ratings of diesel engine generators are 750 kW to
2,500 kW. The gas turbine generators are rated at 750 kW.
(b) The nominal capacities of MUSE substations range from 1,500 kVA to 5,000 kVA.
These substations are designed to provide maximum flexibility for transforming various system
voltages. Presently, transformers rated 3,750 kVA and larger are two winding units, providing
transformation between 13.2 kV or 11.5 kV and 4.16 kV. Either winding may be used as input
or output. Units smaller than 3,750 kVA have three winding transformers. Their High Voltage
(HV) winding nominal voltages are 13.2 kV or 11.5 kV; their Intermediate Voltage (IV) winding
nominal voltages are 4.16 kV or 2.4 kV; and their Low Voltage (IV) winding nominal voltage is
480 V. These units can be operated with the HV or the IV acting as the input or output. The IV
winding is an output winding only.
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