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Thread: Transformer faults? Please help!

  1. #1 Transformer faults? Please help! 
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    I have a 30kva transformer 480/208-120 dry type 3 phase with 5.56 amps going to ground? This looks like a fault to me. Can someone please explain?


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  3. #2  
    Forum Cosmic Wizard
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    Quote Originally Posted by james8 View Post
    I have a 30kva transformer 480/208-120 dry type 3 phase with 5.56 amps going to ground? This looks like a fault to me. Can someone please explain?
    Is the primary wye or delta? If it's wye, what is the neutral current?


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  4. #3  
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    There are two types of three phase transformers, DELTA and Y. If you have the Y configuration, Current in the ground wire is because the loads in each leg are not equal.
    Rearranging the loads will change the ground current for better or worse.
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