Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Power plant transformers

  1. Jun 22, 2012 #1
    When it comes to power plant transformers, What is the typical inductance and impedance on the primary winding?
  2. jcsd
  3. Jun 22, 2012 #2


    Staff: Mentor

    http://www.scribd.com/doc/27073343/Transformer-Engineering [Broken]
    Last edited by a moderator: May 6, 2017
  4. Jun 23, 2012 #3

    jim hardy

    User Avatar
    Science Advisor
    Gold Member

    that's an excellent reference, j-rfu.

    Impedance is indeed given in Per Unit, % of nominal nameplate ratings.
    Transformers for our internal distribution were a few percent, 2 to 5 -ish.

    Our main transformer (the one connecting generator to grid) was 17% .
    The impedance will be mostly inductive so as to not waste kilowatts as heat.
    Electrical system designers spend a lot of time optimizing voltage drops so everything stays within ~10% over operating range of plant.

    The main transformer connecting generator to grid was 894MVA so you can see what 0.1% loss would be in kw - almost a megawatt . It's worth making the big ones highly efficient.

    Sorry i just dont remember the exact numbers but the guidelines in that reference should give you a feel.

    old jim
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook