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3 phase AC output transformer 30 degrees to 120 degrees how?

Discussion in 'General Electronics Discussion' started by Danny Daviss, Mar 17, 2013.

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  1. Danny Daviss

    Danny Daviss

    67
    0
    Mar 16, 2013
    The 3 Phases are 30 degrees apart before the output transformer

    The output transformer turns 30 degrees into 120 degrees AC, but how does it do this please?

    Its for 3 Phase UPS systems
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    11,533
    2,656
    Nov 17, 2011
    What circuit are you talking about?
    How do you know these pahse differences? Did you measure them? Where do they come from?

    I very much doubt that what you describe really happens. A transformer can rotate the phase from input to output. However, it will do so for all phases in the same way. Therefore, signals that are 30° apart on the input side of the transformer will still be 30° apart on the output side - even if they are 180° phase shifted between input and output.
     
  3. Danny Daviss

    Danny Daviss

    67
    0
    Mar 16, 2013
    Its a UPS 3 phase system

    The phase difference are 30 degrees apart before the output transformer

    Yes I understand that too
     
  4. Danny Daviss

    Danny Daviss

    67
    0
    Mar 16, 2013
    Its 3 phase , 120 AC , 120 degrees is the output of the unit

    When you measure with an oscilloscope before the output transformer the 3 phase waveforms on a 3 channel oscilloscope are 30 degrees apart. When measuring the 3 phases after the output transformer, the 3 phase are 120 degrees apart.

    How does that work?
     
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