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  • Users: arrehman1
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  1. arrehman1

    Delta Wye Transformer HV line current analysis for LV faults

    Hello everyone, I was reviewing through faults on the LV side of a non-standard delta wye transformer connection. My intention was to understand how the HV line currents would flow based on the type of secondary through fault… The Delta side of the transformer would be connected...
  2. arrehman1

    Delta Transformer Vector Group dashed "reference" line meaning?

    Hi all, So I have a dumb question... For a DAC Wye-grnded transformer (Dyn11) with ABC positive sequence rotation - It's very easy for me to see that the secondary line current lags the primary line current by 330 degrees. Or in other words, the secondary line current leads the primary line...
  3. arrehman1

    Harmonic issues with lightly loaded transformers

    Can harmonic problems arise (particularly 3rd harmonic) for lightly loaded distribution transformers connected Delta Wye-grounded? I've gone through several sources but couldn't find anything substantial on this particular topic... Thank you in advance for your comments!
  4. arrehman1

    Delta Connected CTs

    While doodling delta connected CTs on engineering paper (we've all done this), I realized that the CT secondary line current which is going into the relay input terminal has no return path back to the CT secondary circuit... the line current just goes to ground. There is no circulation of line...

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