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Transformer question

Discussion in 'General Electronics Discussion' started by Mick from Aus, Feb 28, 2016.

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  1. Mick from Aus

    Mick from Aus

    Feb 28, 2016
    Hi everyone.

    Some friends of mine have a machine that the power transformer has failed (they assume). They have puller the transformer out and given it to me to find a replacement (I design large industrial systems).

    I was going to tell them "no, there's no output rating other than voltage so I don't have enough information to replace it" but I thought maybe the numbers "76 * 38" give enough and I just don't know how to interpret it.

    I've attached a pic,

    Is it possible to tell the A from this info?

    P.S I've advised them against doing it themselves, but as adults of sound minds they have chosen to do it anyway.

    Attached Files:

  2. Bluejets


    Oct 5, 2014
    76 * 38 to me would seem like the physical size.
    Other than that I don't read Chinese so not much help there.
    For actual electrical size you need a VA figure.(volt amp)
    I'd be doing a test on it before going any further.
    Simple whiff test first to see if it might be burned-up and then a continuity check with a multimeter.
    Would show if it was open circuit or not at least.
    Then get a lecky to power it up and do a couple of voltage tests.
    sureshot and Arouse1973 like this.
  3. sureshot


    Jul 7, 2012
    An indication on what it was powering should narrow down its power value, a look at the PCB if that's possible to interpret the secondary taped voltages on the input.
  4. davenn

    davenn Moderator

    Sep 5, 2009
    you didn't write down the whole sequence .... it's E176*38 .... probably the part number
  5. Minder


    Apr 24, 2015
    The transformer is very easy to test and run for a period to see if there is significant heat with no load.
    The VA is usually determined by the core size which the winding gauge has to conform to.
    Just from the Pic I would consider a 50va a suitable replacement.
  6. Bluejets


    Oct 5, 2014
    Yes, well, it looked like EI 76*38 , maybe you are right....o_O
  7. davenn

    davenn Moderator

    Sep 5, 2009
    agreed .... not 100% certain if it is E1 or El LOL
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