3 phase systems

Discussion in 'General Electronics Chat' started by chuck 1, Aug 14, 2011.

  1. chuck 1

    Thread Starter New Member

    Aug 14, 2011
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    we have machines that won't run when we have a ground on 3 phase delta system, how do you safely ground 1 phase to test ground fault
     
  2. RRITESH KAKKAR

    Senior Member

    Jun 29, 2010
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    That's Good question...!!

    Just for checking grounding you have to use Multimeter connect one probe of meter to ground and other to neutral note reading, then check live and neutral voltage.
    on comparing then you can know the quality of groundong.
    Ideally it is 0V ..
     
  3. GetDeviceInfo

    Senior Member

    Jun 7, 2009
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    google 'delta resistance grounding' and you will find plenty of good resources.
     
  4. shortbus

    AAC Fanatic!

    Sep 30, 2009
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    Bad information:( There is no 'neutral' in three phase.
     
  5. GetDeviceInfo

    Senior Member

    Jun 7, 2009
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    just as 'bad'. there may be a grounded center tap in a delta, and the central point of a wye may be brought out, in which case code requires it to be grounded. both being three phase.
     
  6. shortbus

    AAC Fanatic!

    Sep 30, 2009
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    But like I said there is no 'neutral'. Ground is not considered neutral. With three phase there are three 'hots' and ground.
     
  7. GetDeviceInfo

    Senior Member

    Jun 7, 2009
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    Not so in the case of a wye with center brought out. You may be thinking 3 phase/ 3 wire, but 4 wire systems are very common.
     
    Last edited: Aug 14, 2011
  8. chuck 1

    Thread Starter New Member

    Aug 14, 2011
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    we need to ground 1 phase of a 3 phase 575 vac system to check and train on how to use ground fault indicator/detector in plant because we have machines that won't run at all until we clear ground fault thks
     
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