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Transformer Mystery

Discussion in 'General Electronics Discussion' started by Xelodaki, Jun 27, 2015.

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  1. Xelodaki

    Xelodaki

    9
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    Jun 27, 2015
    Hi!


    I got a little problem with my 220/ 18V-2A, 8V-3A, 350V-200mA transformer, ive been trying to find the primary winding
    input, but cant just find it!! Ive been trying to find it with my multimeter ohms setting, can't just find it.
    Could someone please help me? :)
     

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    Last edited: Jun 27, 2015
  2. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    Does it have any writing on the transformer?
     
  3. Xelodaki

    Xelodaki

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    Jun 27, 2015

    Thats all, i can't find any datasheet of it
     

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  4. galaxy

    galaxy

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    Nov 3, 2012
    You can see the wires going to the pins. The 18v 2a and 8v 3a will be thicker wires so you can discount them as primary. The other wires will be thin. I'd identify the pairing for these and apply 12 or 24v ac to one and see what the output on the other is. Should be able to figure out which is which.
    But are you sore those are the ratings...? I don't know German but that label mentions bigger numbers.
     
  5. Xelodaki

    Xelodaki

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    Jun 27, 2015

    The shop where i bought them says those ratings.
     
  6. davenn

    davenn Moderator

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    1,911
    Sep 5, 2009
    Hi there
    welcome to EP :)

    the end you have the clip on appears to be the primary winding for 220V the 2 outer terminals
    the next pair in are not connected the centre pair you can see are linked ( this is for the 110/220V use for splitting the windings

    please show a photo of the other ends so we can see the wires going to each terminal

    Dave
     
  7. davenn

    davenn Moderator

    13,710
    1,911
    Sep 5, 2009
    yeah that worries me too

    it gives the impression that the output voltages are in the 1000's of volts!!!

    BE STRONLY WARNED --- this could be dangerous
     
  8. Xelodaki

    Xelodaki

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    Jun 27, 2015

    Heres a picture from the other side.
     

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  9. davenn

    davenn Moderator

    13,710
    1,911
    Sep 5, 2009
    OK 8 terminals

    from left to right 1 2 3 4 5 6 7 8

    1 and 2 are a winding
    3 and 4 a winding
    5 not connected
    6 and 7 a winding
    8 not connected

    @Harald Kapp is our lad from Germany, maybe he can decipher the wording on the label :)

    Dave
     
  10. Xelodaki

    Xelodaki

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    Jun 27, 2015
    Well, thanks to all who cared to help me :) ill try if it would work.
     
  11. davenn

    davenn Moderator

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    1,911
    Sep 5, 2009
    I have tagged Harald ... PLEASE wait for his response before powering it up
     
  12. Xelodaki

    Xelodaki

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    Jun 27, 2015

    Well, ok :D
     
  13. davenn

    davenn Moderator

    13,710
    1,911
    Sep 5, 2009
    I don't want to killing yourself
     
  14. poor mystic

    poor mystic

    1,068
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    Apr 8, 2011
    :)
    A signal generator, set to the proper frequency for the transformer under test, can be very useful in safely identifying transformer windings.

    PS
    I'm pretty sure the high voltages mentioned on the transformer label are the isolation test voltages. The word "gepruft" on the label means a "severe test".
     
  15. Xelodaki

    Xelodaki

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    Jun 27, 2015
    Well, i don't have any signal generators
     
  16. Xelodaki

    Xelodaki

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    Jun 27, 2015

    Thanks for care ;)
     
  17. duke37

    duke37

    5,364
    769
    Jan 9, 2011
    This could be a very high voltage transformer and could be dangerous as said before.
    The primary and secondary appear to be on separate bobbins which would support this.
    Measure the resistances between the pins to see which where the windings are connected.
    The primary may be in two sections for 110V and 220V, these should be almost identical in resistance. and would be connected in series for 220V and in parallel for 110V.
    If the output is low voltage, the resistances will be lower than the primary, if it is very high voltage, then the resistance will be high. An inductance meter could give turns ratio.

    Harald will tell what the label says but I think that gepruft means that it has been tested (for insulation) at high voltage.
     
    hevans1944 likes this.
  18. Xelodaki

    Xelodaki

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    0
    Jun 27, 2015

    Heres ohms, second isnt 240ohms its 24ohms
     

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