5424Ch08 - FM 5-424 Part Three. Power Generation CHAPTER 8...

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FM 5-424 Generators 8-1 Part Three. Power Generation CHAPTER 8 Generators The demands for electricity in military field operations are numerous and var- ied. Electricity powers equipment ranging from rock crushers to missile launchers. It services aircraft, ships, and land vehicles. Electricity is required for command and control operations, medical support, and other facilities. The Department of Defense (DOD) uses a family of generator sets to produce the electrical power needed by military field units. This family was developed in the 1960s to reduce the variety of generator sets and repair parts required by all services. This chapter describes the generators in this family and provides instructions for their use. Section I. Mobile Generator Sets and Electric Distribution Systems MOBILE GENERATOR SETS A mobile electric generator set converts mechanical energy to electrical energy by using an engine to drive the generator. An internal fuel supply makes the set indepen- dent and mobile. When equipped with acces- sories such as an electric distribution system, this set produces all the power needed by military forces in the field. The elements of an electrical power-generating site in the field are shown in Figure 8-1, page 8-2 . Table 8-1, page 8-3, lists the characteristics of generator models found in the DOD inventory and shows kilowatts, frequency rating (in cycles per second), and voltage output. The rated current of DC generators is shown in the output column. The charac- teristics in the table must match the requirements for the equipment that is being connected to the generator set. Table 8-2, page 8-4, shows the generator models separated by the type of engine that drives the generator, the application (use) for each model, and the TM that provides additional information about it. Electric generator sets are driven by gaso- line or diesel engines and produce AC or DC. AC changes in value and reverses its direc- tion of flow at regular intervals; DC is con- stant in value and flows in only one direction. AC GENERATOR SETS The lighting and power loads of most field units require voltages and frequencies sup- plied by AC systems. While 60-cycle AC is
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FM 5-424 8-2 Generators used much of the time, loads with specific volt- age, frequency, and power requirements may use up to 400-cycle AC. Radar, fire-control sets, communication controls, and guided- missile systems are examples of equipment that require 400-cycle AC. Some equipment can operate with either 60- or 400-cycle AC. AC generator sets are designed to operate at various voltages, frequencies, and power lev- els. To meet a particular power demand, an operator must choose a set with the proper characteristics. If a large set is needed but is unavailable, several small sets, each located near the load to be supplied, may be used.
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This note was uploaded on 05/21/2010 for the course ELECTRICAL Electrical taught by Professor N/a during the Spring '10 term at Open Uni..

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5424Ch08 - FM 5-424 Part Three. Power Generation CHAPTER 8...

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