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Diesel Generators Explained - Articles Surfing
A diesel generator is composed of a diesel engine and an alternator or an electrical generator, which converts the power created by the engine (expressed in RPM, revolutions per minute) into the required voltage for homes, industry and remote work sites. The need for power for homes and sites, which are not connected, to a power grid is a growing need throughout the world. Remote areas of Central and South America are no longer too poor to afford electrical power but not at the stage to built vast hydroelectric projects or large power grids.
They can afford to build local village electrical power plants, which can meet the modern needs of the people until the modern power grid can reach out to them. There are places in the United States that are developing ahead of the ability of the local power company to expand; other places throughout the world are at the edge of civilization. All of these require power for business, commerce, medical treatment facilities and communication. The price of the modern diesel generator, the new technology incorporated into these units and their availability throughout the world make them an immediate solution.
Homes and ranches, villages and towns and remote sites should create a power needs list that includes every appliance in the home, business, school and public facility in order to determine the wattage needed. After this the home or ranch owner, city engineer or site foreman can select the proper sized diesel generator. Every diesel generator is rated at how many kilowatts of power it produces. If the home or ranch requires 22 kW to 25 kW then the sized generator should be at least a 30kW. A brigade sized army unit twenty years ago used a diesel generator(s) rated at 90 kW but its* needs were lighting and mess hall refrigeration. Today it could be quite a bit more considering the new technology.
When you decide to provide power through diesel generators then you should consider whether you need a backup. The power of the generator is rated at 50% engine speed. The 30 kW diesel generator actually operates safely at 25 kW at 1800 rpm for prolonged periods of time. It would be safer if the home or ranch had two generators scheduled to operate in an alternating schedule of 12 hours each. This would ensure that the proper maintenance and care could be given the generators while providing continuous power. Other considerations in selecting a power generator involve selecting one that is a four-cycle, water-cooled industrial diesel generator.
A water-cooled generator operates more quietly than an air-cooled and it lasts longer. There are two electrical systems involved with a diesel generator, the DC (direct current) and the AC (alternating current) systems. The recommended DC system should have a starter motor with a battery-charging alternator with a solid-state voltage regulator. It should have an engine pre-heat electric switch and start/stop switch.
It should have an emergency engine shutdown system to protect the engine in case of oil pressure loss, excessive generator speed, over cranking and engine high water temperature. Finally, it should have DC electric system breakers. Make sure that the AC system is a four-pole revolving field and is has an AVR (automatic voltage regulator). These generators will provide power that is within -+2% as compared to utility company variation, which is -+5%.
Copyright © 1995 - Photius Coutsoukis (All Rights Reserved).
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