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Transformer getting hot and burning

Discussion in 'Electronic Basics' started by anil.deshpande, Nov 13, 2004.

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  1. I have bought a tape recorder whose rectifier was designed for 60hz
    and 120 volts and I changed only the transformer in the rectifier from
    120v 1 amp to
    230 volts 1 ampere.
    Is that okay?
    If so why does my transformer becomes hot?
    Thanks
    Anil Deshpande
     
  2. Sounds like the tranny might not be big enough, can you try something with
    more capacity (I.e say 2amp rating) ??
     
  3. Hi,
    Is the 230V transformer designed for 50 or 60Hz? Which line frequency do
    you use?
    Using a 50Hz transformer on a 60Hz line _might_ cause relatively high
    magnetic losses (heat), depending on the design of the transformer.

    hth,

    Robert
     
  4. Clarence

    Clarence Guest

    You have it backwards Robert.

    Using a 60Hz transformer on a 50Hz line _might_ cause relatively high
    loss (heat), depending on the design of the transformer. (TOO LITTLE IRON!)
     
  5. Hi, Clarence
    Yea, of course - you're right. 60Hz transformers need less iron.
    Normally, this should cause no problem. Only if the larger transformer
    core was already at its limits the smaller one will produce too much
    losses.

    So, hope I didn't get anything wrong now - it's too late today.

    greetings,

    Robert
     

  6. Add a fan to counter this effect.
    That keeps the temperature down which fixes the problem.
     
  7. Don Kelly

    Don Kelly Guest

    If he has replaced the original 120V transformer with a 230V transformer, he
    has done it to use at 50Hz and a relatively cheap 60Hz transformer at 50 Hz
    might be well into saturation and have excessive magnetising current.
     
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