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    danar's Avatar
    danar Posts: 69, Reputation: 2
    Junior Member
    		  
    #1

    Jan 21, 2007, 02:28 AM
    grounded delata power system
    hi guys,
    anybody who can explain me the grouded delata power system?
    I have seen one installation in ksa wherein a delta seconondary of a three phase transformer wherein one of the phase leads is connected to ground.
    the voltage reading is as ff.
    phase A to Grnd = 230
    phase B to Grnd = 230
    phase C to Grnd = 0

    phase to phase

    A-B =400
    A-C = 230
    B-C=230
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Jan 22, 2007, 07:57 AM
    Grounding one leg of a Delta system is typical and recommended, sometimes called a "corner ground". Grounding one leg will insure that a fuse or circuit breaker will operate in the even of a short.

    Delta ungrounded systems are sometimes desired, but need a ground falut detection system to at least indicate the presence of a ground fault that can be repaired at a scheduled time.
    danar's Avatar
    danar Posts: 69, Reputation: 2
    Junior Member
    		  
    #3

    Jan 22, 2007, 09:31 PM
    It looks like we are having a ground fault in this scheme. Is there any effect on our ground fault protection.
    In this kind of connection what is the voltage limitation?
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #4

    Jan 23, 2007, 03:40 AM
    Any voltage can be had depending on the spes of the transformer.

    I do not understand your question:

    it looks like we are having a ground fault in this scheme. is there any effect on our ground fault protection
    danar's Avatar
    danar Posts: 69, Reputation: 2
    Junior Member
    		  
    #5

    Jan 28, 2007, 02:37 AM
    What I mean is that the ground fault protection in the primary side of the transformer can sense a fault current if one lead in the secondary is grounded.
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
    Uber Member
    		  
    #6

    Jan 28, 2007, 05:41 AM
    No, both sides will each need a GFI sensing relay.A GFI on the Primary will only detect a fault in the windings of the transformer.
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