Can You Solve This (DC Loading)1 - CR4 Discussion Thread

Home

Products & Services

Engineering News

Standards

Webinars

Engineering Forum

Login

CR4 Home | Electrical Engineering | Electrical Engineering

3 comments

Rate

Comments: Nested

harjeetsinghengg Commentator Join Date: Jul 2008 Posts: 56 Good Answers: 1	Can You Solve This (DC Loading)1 08/25/2008 10:12 AM
	friends, I clearly want to ask that if we have 3 phase alternator of rating 3MW , 440V to feed load of 3MW (not consider single load it might be combination of many equipment total of which is 3MW), now some how same alternator have to connect to DC load(after disconnecting from previous circuit) so what will be the new load capacity which alternator can provide. for dc load we have to convert ac to dc. there must be some derating factors - I come to know that the efficincy will become 30% only. is this true, this figure is come from alternator suppliers.
	Register to Reply

Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Join CR4, The Engineer's Place for News and Discussion!

techno Guru Join Date: Jan 2007 Location: Canada Posts: 1024 Good Answers: 40	#1 Re: can u solve this(dc loading)1 08/25/2008 10:36 AM
	It all depends on the efficiency of the AC to DC converter (DC Power supply) which has been known to reach 90% Here is one for 1.5 MW with 85% efficiency __________________ Perfection is a subjective and abstract concept.
	Register to Reply

jack of all trades Guru Join Date: Sep 2006 Location: Auckland, New Zealand Posts: 8777 Good Answers: 376	#2 Re: can u solve this(dc loading)1 08/25/2008 3:32 PM
	30% doesn't sound right at all, did your alternator supplier advise only converting one of the three output phases to DC? Could you provide more information on the actual DC and AC loads you are using. Is this a test lab application, what are you actually doing? Do you really mean 3MW (3,000,000W)? What DC regulation do you actually need, is it a nice smooth DC using an expensive electronic AC-DC converter or will a full-wave bridge rectifier with a couple of big capacitors do? More information is needed please. __________________ jack of all trades
	Register to Reply

nesubra Guru Join Date: Nov 2006 Posts: 729 Good Answers: 2	#3 Re: Can You Solve This (DC Loading)1 08/26/2008 2:52 AM
	Efficiency of ac 3ph to DC converters are close to 90%.30% sounds improbable.Could u give more details as to how u got this 30% and in what context? __________________ To avoid crticism do nothing,say nothing,be nothing
	Register to Reply

Copy to Clipboard

Users who posted comments:

jack of all trades (1); nesubra (1); techno (1)

You might be interested in: Loading Arms, DC-DC Converter Chips, AC-DC Adapters

	Got Something to Say?
	Ask a Question Start a Discussion

	Search this Forum
	Electrical Engineering: Go

CR4 Sections

	Aerospace
	BioMech & BioMed
	Chemical & Material Science
	Civil Engineering
	Communications & Electronics
	Education and Engineering Careers
	Electrical Engineering
	General Discussion
	Instrumentation
	Manufacturing
	Mechanical Engineering
	New Technologies & Research
	Software & Programming
	Sustainable Engineering
	Transportation

	Site Directories
	Forum Directory Blog Directory User Group Directory RSS Feeds CR4 Rules of Conduct CR4 FAQ Site Glossary Who's Online (80 right now) Show Members