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Unknown Transformer secondary Amperage

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Discussion in 'General Electronics Discussion' started by lferreira, Apr 19, 2010.

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  1. Apr 19, 2010 #1
    lferreira

    lferreira

    3
    0
    Apr 19, 2010
    Hello,

    I've got an transformer of 220v - 12v. The problem is that i don't know the amperage gived by the secondary. How can i know it?
    Is it possible to know it if i put an amperimeter in short circuit? i'm afraid to burn it if i do.

    btw, sorry for the ignorance. :)
     
    Last edited: Apr 19, 2010
  2. Apr 20, 2010 #2
    (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,505
    2,849
    Jan 21, 2010
    If there's a part number on it, then maybe someone can look it up.

    If it came from a device that you have the circuit for, then we may be able to make a guess.

    Yes, shorting it will damage it.
     
  3. Apr 20, 2010 #3
    Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    The size & weight of it will be tightly correlated to the VA rating of it (just compare it with similar xformers), and the gage of the wires tells you the Amp rating.
    Shorting it for 1 second won't damage it afaik but it won't give you much useful information.
     
  4. Apr 20, 2010 #4
    lferreira

    lferreira

    3
    0
    Apr 19, 2010
    The transformer was originally from an Mustek UPS.

    the part number on it is the following:

    080-48183-01
    GP 0721
    Class B Viking B-2
    E210832

    the size is of it is 8cm (3.14 inches)

    primary 220v
    secondary 12v
     
    Last edited: Apr 20, 2010
  5. Apr 20, 2010 #5
    (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,505
    2,849
    Jan 21, 2010
    There are 2 mentions of this transformer that I can find on the internet. Both seem to be talking about the same thing.

    The consensus is that the part numbers may refer to the core and that it may be a "custom" transformer.

    I can't confirm this information (obviously).

    It may be a very good idea to determine the gauge of the wire. It may indicate a ballpark figure for the current.
     
  6. Apr 20, 2010 #6
    lferreira

    lferreira

    3
    0
    Apr 19, 2010
    well, i've been digging a little bit, and the transformer originally was on a 600VA UPS

    at least 250W of electricity the primary is giving when working as an inverter from 12v-220v. ( i know that it should be more)

    assuming that the efficiency of the transformer must be at least 0.6 (worst case scenario)

    making the math, that A=P/V
    then

    A = (250/12) * Efficiency(0.6)

    so i get 12,5 Amp out of it (at least)

    am i assuming wrong?

    the only thing that it will be is for a battery charger, so i assume that it will be enought to start working on the circuit charger?
     
  7. Oct 1, 2010 #7
    jteachout

    jteachout

    1
    0
    Oct 1, 2010
    I'm a novelist at best I have the same transformer I would like to know how to connect the wires I'm also looking for step-down high amp use
     
  8. May 30, 2011 #8
    mvarga

    mvarga

    1
    0
    May 30, 2011
    My transformer marke are :

    080 - 48155-02
    GP 0712
    Class B Viking B-2
    E210832

    has anybody the scheme for the wires?
     
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