please read and help-rectifier based project

Discussion in 'The Projects Forum' started by Andrew Guy, Jan 10, 2009.

  1. Andrew Guy

    Thread Starter New Member

    Jan 10, 2009
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    I have been assgined a project at my college were i have been asked to put together a proposal to retrofit a damaged DC generator with an AC alternator to power an engine room whos equipment runs on DC. I am not entirey sure how to go about this and any help anyone could provide me on how to start the project or even usefull web links would be greatly appreciated. Feel free to forward any information to my e-mail address Thanks very much in advance
    Andy
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
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    That is hard to start, as there are no parameters given. What voltage and how much current does the DC equipment in the engine room need?

    It is interesting to note that your title indicates a rectifier, but not the text. Here is a link to our Ebook section on rectifiers - http://www.allaboutcircuits.com/vol_3/chpt_3/4.html.
     
    Last edited: Jan 10, 2009
  3. Andrew Guy

    Thread Starter New Member

    Jan 10, 2009
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    Th original generator ran at 700rpm producing 1000kw.that is all the information i have been given.i have a very limited experience in electrics so realy anything you can tell me would be great. Thanks
    Andy
     
  4. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Might check some of the DC equipment for operating voltages. One megawat is a lot of juice, in the neighborhood of a diesel-electric train alternator.
     
  5. mik3

    Senior Member

    Feb 4, 2008
    4,846
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    Better to use a 3-phase generator and then rectify the 3-ph AC with a 3-phase rectifier. This produces a smoother voltage than a single phase full wave rectifier.
     
  6. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    That really is not enough information; voltage or current is also needed - and are you certain about that 1,000kW figure? :eek:

    1kW is the capacity of a typical automotive alternator; some go up to 2kW. But you're talking of 500 to 1,000 times that much power.
     
  7. beenthere

    Retired Moderator

    Apr 20, 2004
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    Just as interesting - what drives this alternator? You mention 700 RPM with the genny - it this a fixed speed? Lots of alternators are made to operate with a 400 Hz output. You would be stuck with either 60 or 400 Hz operation for off-the-shelf hardware.
     
  8. duffy

    Active Member

    Dec 29, 2008
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    It could be, some of those big marine systems are diesel-electric, some use a turbine to drive the generator. A million watts would be about 1,300 hp - enough to drive a small ship.
     
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