Ringing Transformer overloading or overdriving

Discussion in 'General Electronics Chat' started by DexterMccoy, Feb 19, 2014.

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  1. DexterMccoy

    Thread Starter New Member

    Feb 19, 2014
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    When you hear a transformer ringing sound or sounds from a transformer how do you know if it's from overloading the secondary or overdriving the primary? or what else can it be?

    When overloading a transformer it makes rings sounds
    When overdriving the input it makes ringing sounds

    What test can i do with the O-scope to know if the transformer is overdriven or overloaded?

    What else would cause ringing in transformers?

    The transformer ringing sounds is harmonics?
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
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    The ringing sounds like lamination vibration due to eddy currents in the core, if due to the transformer overload, this occurs in both primary and secondary, as the secondary load is reflected back to the primary.
    Signs of overload are over current accompanied by overheating.
    Max.
     
  3. DexterMccoy

    Thread Starter New Member

    Feb 19, 2014
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    How do you test using a DVM or O-scope while the transformer is ringing?

    On the O-scope , how would u know if the transformer is overloaded or overdriven?
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
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    You need to take a current reading in one of the more conventional methods.
    Clamp on or series ammeter.
    Max.
     
  5. DexterMccoy

    Thread Starter New Member

    Feb 19, 2014
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    But how would you know if the current is overloaded or overdriven? or how would you see the harmonics of the transformer?

    How would u know if the current is distorted? would i need to use a O-scope current probe?
     
  6. t06afre

    AAC Fanatic!

    May 11, 2009
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    Is it a quite big transformer?
     
  7. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    Voltage should be dropping off on the secondary and it will start getting hot - too hot to touch for several seconds.
     
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