3 phase transformer neutral

Discussion in 'Power Electronics' started by PAULSINCLAIR, Jun 14, 2017.

  1. PAULSINCLAIR

    Thread Starter New Member

    May 3, 2017
    12
    0
    Hi,

    I have a 3 phase transformer (see below). I want to step down from UK 3 phase (415V) to US 3 phase (230v). I was thinking, connect the 3 phases to H1/H2/H3 and don't connect the UK neutral, then X1/X2/X3 are the 3 US phases with X0 being used as the neutral which i will connect to ground.


    upload_2017-6-14_16-29-45.png
     
  2. Dyslexicbloke

    Well-Known Member

    Sep 4, 2010
    546
    34
    Phases, 415 on H1,H2,H3 neutral is not connected.


    115/200 is on X4,X5,X6 with N on X0

    Adjust the primary taps to trim the voltage, a higher tap voltage setting will result in a lower outtput....

    Al Its all on the label...
    If you do not know what you are doing get physical help, this stuff can kill you and burn your family/employees.

    My comments in no way constitute a design.
    A qualifuied installer will need to design and test and certify the protection required for the transformer and anything connected to it.

    Ignoring this warning will probably kill someone... DONT .
    I am not kidding or blustering at these energy levels you dont walk away, simply dropping an uninsulated tool could blind you or worse.

    Al
     
  3. MaxHeadRoom

    Expert

    Jul 18, 2013
    16,384
    4,818
    The primary indicates Delta connection anyway. So no neutral involved on the primary.
    The connection is as the plate indicates surely?
    Max.
     
  4. PAULSINCLAIR

    Thread Starter New Member

    May 3, 2017
    12
    0

    99% sure this is correct, thoughts?
    upload_2017-6-15_8-49-14.png
     
  5. PAULSINCLAIR

    Thread Starter New Member

    May 3, 2017
    12
    0
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
    16,384
    4,818
    230v/240v Looks right to me. But your voltage to N will be a little higher that 120v if that is what you are aiming for ~132v.
    Max.
     
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