Electrical Engineering ⇒ Topic : Reasons for paralleling D.C. generators
REASONS FOR PARALLELING D.C. GENERATORS
The reasons for paralleling D.C. generators, (especially when it is recognised that this usage of the word parallel means duplicater or multiple) are enumerated below :
Reliability. The sources of power such as generators are frequently primary safety items and are therefore duplicated or paralleled for reliability.
Continuity of service. In case of break-down or routine maintenance it is frequently required that the device being worked on be isolated from its work and shut down. Therefore, if power sources are paralleled the routine or emergency operations can be performed without disturbing the load conditions. This affects both safety and economy.
Efficiency. It is a known fact that many major types of machinery, such as generators,run most efficiently when loaded to their design rating. Electric power costs less per kWh when the generator producing it is efficiently loaded. Therefore, when the load is reduced, one or more generators can be shunt down and the remaining units kept efficiently loaded.
Added capacity. The use of electricity is constantly increasing in the modern world of expanding population, goods and service. When added capacity is required, the new equipment can be simply paralleled with old.
In several situations (not econfined to generators), the equipment available to do a particular task may not be available in a sufficiently large capacity or size in a single unit. Here paralleling must be a design feature just to meet original load requirement. An absolute unit to the size and output capacity of a D.C. generator does not seem apparent, but in any endeavour a new largest size is always more expensive and usually has unforeseen 'bugs', which may be ruinously costly.
Note. Power sources are rarely duplicated in home or automobile service, but usually are in air craft, marine, rail and industrial use.
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