electrical

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eng.hmk Associate Join Date: Jan 2008 Posts: 44	electrical 11/12/2008 1:43 AM
	what is the load shedding
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Current Maarey Power-User Join Date: Aug 2008 Location: East Posts: 117 Good Answers: 6	#1 Re: electrical 11/12/2008 2:36 AM
	Consider an industrial plant with power requirement being met from in house generation only. Say total generation capacity is x, consisting a a number of generators. Power demand at a given instant of time is also x. Now one or more of the generator fails or trips the result is the other remaining generators are subjected to higher load demand. In order to keep the remaining generators in operation the extra load on the system needs to be tripped. The process of automatically shutting down the least critical loads is called load shedding. The same is achieved by continously monitoring the demand and supply condition and taking appropriate action (load shutdown) to maintain the remaining system intact. Load shedding can be contingency based fast load shedding or slow load shedding. fast load shedding is for saving the sstem from collasping and slow load shedding is employed for generator overloads. __________________ Atlas Shrugged - JGD
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noshorts Power-User Join Date: Jun 2008 Location: Olive Branch, Ms. USA Posts: 124	#2 Re: electrical 11/12/2008 9:05 AM
	Load shedding is utilized to reduce the demand factor.(which is a large portion of industrial utility bills) As the load approaches a predetermined setting, as in the case of start-up after a turnaround or power outage, less critical loads are shut down to reduce the amount of energy being pulled from the grid. After the equipment has been restarted the sub- critical loads can then be added to the system with no adverse effects on the demand factor. This is a cost saving measure. __________________ Tell 'em what they need to hear; not what they want to hear!
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V.I.Abraham Guru Join Date: May 2007 Location: Pune , India Posts: 875 Good Answers: 42	#3 Re: electrical 11/12/2008 3:35 PM
	In any electrical distribution system when the actual load is more than the generating capacity it will result in overloading of the generator. This will result in tripping of one or more generators and may even lead to cascade tripping of thee wh3hole system. too avoid such situation when the lad reaches the generating capacity feeders are switched off after studying the systematic loading pattern . Such preplanned tripping of load is termed load shedding
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