how to convert 3 phase voltage to a magnitude???

Discussion in 'The Projects Forum' started by iceman11`, Oct 17, 2008.

  1. iceman11`

    Thread Starter Active Member

    May 4, 2007
    39
    0
    good day all, this is a simple question, but i jst cant find the answer to it : if i have a 3 phase line, but i wish to extract a single magnitude THAT IS EQUIVALENT to the 3 phase voltages how to i do that??

    i know that there is some formula to do this? but i cant find it??

    it is basically an amplitude calculator for all three line phase/line voltages


    thanks:D
     
  2. Externet

    AAC Fanatic!

    Nov 29, 2005
    759
    57
    If the voltages of the 3 phases are identically divided to a level that can be handled by a summer circuit, that would yield a proportional value. (But it will not reveal which one is the weakest nor the strongest phase)
    (Like a microphone mixer circuit)
    Miguel
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    AVERAGE of:
    Potential A times sine (0 degrees)
    Potential B times sine (120 degrees)
    Potential C times sine (240 degrees)

    What do you get?

    If life is perfect, zero volts. However, life is seldom perfect.
     
  4. iceman11`

    Thread Starter Active Member

    May 4, 2007
    39
    0

    hey, thanks,

    but wudnt this mean that the magnitude contributed by the "phase A line" will always be 0, since sine 0 deg is 0...

    this means that this wud contribute nothing to the overall magnitude...which is obviously not true :(
     
  5. scubasteve_911

    Senior Member

    Dec 27, 2007
    1,202
    1
    The average of any time-harmonic signal is zero, but not true for the products.

    Steve
     
  6. raybo

    Member

    Oct 18, 2008
    22
    0
    add diodes to each phase so you get rectify DC that is something that you can measure for sure . loose a line you will know. simple .
     
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