protection circuit fo an ct..

Discussion in 'General Electronics Chat' started by Avicreats, Feb 22, 2013.

  1. Avicreats

    Thread Starter New Member

    Jan 18, 2013
    19
    0
    I have a ct of range (80/2)amps. It is a split core ct. Its primary is wired to a 240v AC. Now: I have to measure the flow of current in primary. I need a digital output . I have no idea to do that. And also I need the over voltage protection circuit for the components that are connected to secondary end of ct if the secondary gets open. Can anyone help me in doing this would be a great help for me? Thank you.
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,437
    3,360
    What is a ct?
    What do you mean by (80/2)?
     
  3. ScottWang

    Moderator

    Aug 23, 2012
    4,853
    767
  4. BillB3857

    Senior Member

    Feb 28, 2009
    2,400
    348
  5. Avicreats

    Thread Starter New Member

    Jan 18, 2013
    19
    0
    Ct-current transformer.(80/2) means when 80 amps flows in the primary then 2 amps is produced in secondary... do any one hav a over voltage protection circuit to safeguard the component attached to secondary of ct..
     
  6. tinkerman

    Member

    Jul 22, 2012
    136
    34
    Never heard of such a thing (protection circuit). All our CT's at work are rated 5 amp secondary but that's beside the point. Never open circuit a CT. It must ALWAYS have a load attached. If you're attaching something that will carry less than the rated current of the CT it will likely cause an open circuit. I've seen the damage caused by an open circuit CT and it wasn't carrying near the full current.
     
  7. Avicreats

    Thread Starter New Member

    Jan 18, 2013
    19
    0
    Can u explain in brief wat happens in secondary of cut gets open?
     
  8. BillB3857

    Senior Member

    Feb 28, 2009
    2,400
    348
    Depending upon the current being measured, the voltage on the output of the CT can rise to the point of destruction. It is designed to provide a current into a load, period.
     
Loading...