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Thread: Convert from Phase-to-Phase to Phase-to-Neutral for a 3-Phase 3-Wire unbalanced syst

  1. #1
    Join Date
    Apr 2017
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    Convert from Phase-to-Phase to Phase-to-Neutral for a 3-Phase 3-Wire unbalanced syst

    Hi all,

    As the title suggests I am trying to understand what is involved in converting from P-P to P-n values.
    More specifically I am trying to understand what the process for doing this is, if I had the raw waveform data from two VTs (assuming middle phase is grounded).
    i.e Is there a simple vector math I can perform on each measured sample?
    Or maybe a more complex trigonometric(/phasor diagram) based solution to get from P-P to P-n.

    Please state assumption made and remember its a 3-phase, 3-wire unbalanced solidly ground system.

    I also trying to understand what functions other than power metering (eg protection?) I could perform on the obtained signals/variables.

    If you have links, manuals, or books to point me to that would be great.

    Thanks
    Alex
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  2. #2
    Join Date
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    Correction:

    *(assuming middle phase input into meter is grounded).

  3. #3
    Join Date
    Apr 2008
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    Ann Arbor, Michigan
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    190208-0950 EST

    I believe your question is about measurement of three phase power or energy with two single phase watt or watt-hour meters. Your post title did not seem to imply this, but text and drawing did. No wire needs to be earthed or called ground for this measurement.


    See http://forums.mikeholt.com/showthread.php?t=189230



    .

  4. #4
    Join Date
    Jan 2016
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    PA
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    4,780
    you want a ph-n voltage on a system with no n?
    why?



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