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Thread: Generator Decrement Curve

  1. #1
    Join Date
    Jan 2013
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    Phoenix, Arizona
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    19

    Generator Decrement Curve

    Hello,<br><br>This is a question based on the the short circuit decrement curve of a alternator. In the&nbsp;alternator&nbsp;data sheet it has three of the curves with different connections: 1) Low wye or Delta Connection 2) High wye connection and 3) 600V Connection.<br><br>I am not able to understand the difference. Can anyone explain this? I have attached the curve sheet for&nbsp;reference.
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  2. #2
    Join Date
    Jun 2003
    Location
    Hawthorne, NY
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    2,423
    The difference between what? Looks pretty self explanitory to me. How do you intend to connect it?

    -Hal

  3. #3
    Join Date
    Dec 2012
    Location
    Placerville, CA, USA
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    9,740
    Quote Originally Posted by hbiss View Post
    The difference between what?
    I think that the OP is not realizing that the Alternator supplied with the genet has two different output voltage options, depending on the way the stator coils are connected. (The exact voltage combinations available will vary with the particular model.) There are a total of 12 output leads from the alternator which can be field reconnected.
    One set of connections produces a wye configuration with the line to neutral voltage at the lower of the two voltages and the line to line voltage (delta) higher. Another set of connections produces a high voltage wye. There should be a separate set of wiring drawings in the documentation that makes that clear. It is just not packaged with the decrement curves.

  4. #4
    Join Date
    Jun 2003
    Location
    Hawthorne, NY
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    I think that the OP is not realizing that the Alternator supplied with the genet has two different output voltage options, depending on the way the stator coils are connected.
    That's why I asked him how he intended to connect it.

    -Hal

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