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Calculation for Earth fault relay

  1. May 19, 2016 #1
    Dear friends,

    May I know how to calculate the earth fault relay/ Earth leakage relay? When we going to use them? Thank you.

  2. jcsd
  3. May 19, 2016 #2


    Staff: Mentor

  4. May 19, 2016 #3


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    Staff: Mentor

    Welcome to the PF.

    In addition to anorlunda's reference, you can read through the Wikipedia page about smaller-scale Earth Fault protection devices:


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