An engine-generator is the combination of an
electrical generatorand an engine(prime mover) mounted together to form a single piece of equipment. This combination is also called an "engine-generator set" or a "gen-set". In many contexts, the engine is taken for granted and the combined unit is simply called a "generator".
In addition to the engine and generator, engine-generators generally include a fuel tank, an engine speed regulator and a generator voltage regulator, cooling and exhaust systems, and lubrication system. Units larger than about 1 kW rating have a battery and electric starter; very large units may start with compressed air. Standby power generating units often include an automatic starting system and a
transfer switchto disconnect the load from the utility power source and connect it to the generator.
Engine-generators are used to supply electrical power in places where utility (central station) power is not available, or where power is needed only temporarily. Small generators are sometimes used to supply power tools at construction sites. Trailer-mounted generators supply power for temporary installations of lighting, sound amplification systems, amusement rides etc.
Standbypower generators are permanently installed and kept ready to supply power to critical loads during temporary interruptions of the utility power supply. Hospitals, communications service installations, data processing centers, sewage pumping stations and many other important facilities are equipped with standby power generators.
Privately-owned generators are especially popular in countries where grid power is undependable or unavailable. Trailer-mounted generators can be towed to disaster areas where grid power has been temporarily disrupted.
Engine-generators are available in a wide range of power ratings. These include small, hand-portable units that can supply several hundred watts of power, hand-
cartmounted units, as pictured below, that can supply several thousand watts and stationaryor trailer-mounted units that can supply over a million watts. The smaller units tend to use gasoline (petrol) as a fuel, and the larger ones have various fuel types, including diesel, natural gas and propane (liquid or gas). The engine can also operate on diesel and gas simultaneously (bi-fuel operation).
There are only a few
portablethree-phase generator models available in the US. Most of the portable units available are single phase power only and most of the three-phase generators manufactured are large industrial type generators.
Portable engine-generators may require an external
power conditionerto safely operate some types of electronic equipment. Small portable generators may use an inverter. Inverter models can run at slower RPMs to generate the power that is necessary, thus reducing the noise of the engine and making it more fuel-efficient. Inverter generators are best to power sensitive electronic devices such as computers and lights that use a ballast.
Mid-size stationary engine-generator
The mid-size stationary engine-generator pictured here is a 100 kVA set which produces 415 V at around 110 A per phase. It is powered by a 6.7 litre
turbochargedPerkins Phaser 1000 Series engine, and consumes approximately 27 litres of fuel an hour, on a 400 litre tank. Diesel engines in the UK run on red dieseland rotate at 1500 or 3000 rpm. This produces power at a frequency of 50 Hz, which is the frequency used in the UK. In areas where the power frequency is 60 Hz (United States), generators rotate at 1800 rpm or another divisor of 3600. Diesel engine-generator sets operated at their peak efficiency point can produce between 3 and 4 kilowatthours of electrical energy for each litre of diesel fuel consumed, with lower efficiency at part load. Dubendorfmuseum of the military aviation) Dubendorfmuseum of the military aviation). The generator worked only when sending the radio signal (the receiver could operate on the battery power)
Emergency_power_generator in a drinking water pumping station.
Bronsengine with Heemaf generator.
Wikimedia Foundation. 2010.
Look at other dictionaries:
Generator — may refer to: * Electrical generator * Engine generator, an electrical generator, but with its own engine. * Generator (mathematics), any of several closely related usages in mathematics.Music * Generator (song), a song by The Foo Fighters *… … Wikipedia
Engine-type generator — En gine type gen er*a tor (Elec.) A generator having its revolving part carried on the shaft of the driving engine. [Webster 1913 Suppl.] … The Collaborative International Dictionary of English
Engine efficiency — of thermal engines is the relationship between the total energy contained in the fuel, and the amount of energy used to perform useful work. There are two classifications of thermal engines (1) Internal combustion (gasoline, diesel and gas… … Wikipedia
Engine City Technical Institute — is an accredited, diesel technology school located in South Plainfield, New Jersey, a short distance off of Interstate 287. It is currently the only such school in the Northeastern United States, and, as such, its graduates are in high demand… … Wikipedia
engine — [n] device that drives a machine agent, apparatus, appliance, barrel, contrivance, cylinder, diesel, dynamo, fan, generator, horses*, implement, instrument, means, mechanism, motor, piston, pot*, powerhouse, power plant, power train, putt putt*,… … New thesaurus
generator — Synonyms and related words: AC motor, Corliss engine, Otto engine, PCV valve, Wankel engine, accelerator, actuator, aeromotor, agent, air engine, alternator, ammeter, amplifier, ancestors, anode, apprentice, architect, armature, artificer, artist … Moby Thesaurus
Engine — This article is about a machine to convert energy into useful mechanical motion. For other uses of engine, see Engine (disambiguation). For other uses of motor, see Motor (disambiguation). A V6 internal combustion engine from a Mercedes car An… … Wikipedia
engine — I (New American Roget s College Thesaurus) n. motor, machine; device; engine of war. See arms, instrumentality, power. II (Roget s IV) n. 1. [A machine for transforming power] Syn. motor, power plant, dynamo, generator, turbine, diesel engine,… … English dictionary for students
Engine displacement — One complete cycle of a four cylinder, four stroke engine. The volume displaced is marked in orange. Engine displacement is the volume swept by all the pistons inside the cylinders of an internal combustion engine in a single movement from top… … Wikipedia
engine — Synonyms and related words: AC motor, Corliss engine, Otto engine, Wankel engine, aeromotor, air engine, alembic, anvil, apparatus, appliance, arc jet engine, axial flow turbojet, beam engine, bearings, blowing engine, boiler, caldron, cam, cam… … Moby Thesaurus