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Differential Protection for transformer

  1. Apr 26, 2014 #1
    Hi just wondering does differential protection protect against turn to turn faults?

    Does it protect against all phase to phase faults or is there special circumstances where it won't protect the transformer?
  2. jcsd
  3. Apr 26, 2014 #2


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    Science Advisor

    Working on the assumption that you are referring to detection of differential current to identify fault conditions.

    Differential current, applied to single transformer windings verifies that the current in equals the current out.
    That must be true of two terminal networks.

    It cannot detect shorted turns in one winding, since that remains a two terminal topology.

    It will detect phase to phase faults since that makes a three or more terminal network topology.
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