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core saturation

Discussion in 'Electronic Basics' started by [email protected], Jun 22, 2005.

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  1. Guest

    I was just thinking about core saturation and how it might be
    detected/measured and I remembered something about current transformers
    being ruined if they were allowed to saturate. Am I remembering
    correctly? Previously I had been thinking that saturation was a
    harmless event -- if currents were limited. Yes or no?

  2. John Larkin

    John Larkin Guest

    You can magnetize a CT by running it without a burden resistor, and
    that will subsequently mess up low-current accuracy. But it's easy to
    demagnetize it and fix it.

    In an extreme case, I guess you could arc it over or something, but
    that's not common.
  3. Core saturation is normally a reversible process.
  4. Rich Grise

    Rich Grise Guest

    It doesn't ruin the transformer - it ruins the waveform and you get
    an inaccurate answer.

    And in a current transformer application, the primary current is limited
    by the load itself, so that's certainly not a problem, but do pay
    attention to that burden resistor! :)

    Good Luck!
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