CT selection

Discussion in 'General Electronics Chat' started by tahir mehmood, Aug 24, 2013.

  1. tahir mehmood

    Thread Starter New Member

    Jun 28, 2013
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    i have some doubts about the current transformer selection.
    if some one knows how to select the current transformer for 11 kv protection purpose, i just need how to select it,which parameters should be kept in mind.
     
  2. #12

    Expert

    Nov 30, 2010
    16,339
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    Current transformers do not protect against voltage. They are a single winding which is excited by current. The result is a current output which must be dissipated in a resistor. The voltage across the resistor is proportional to the current in the wire that passes through the center of the current transformer. The voltage on the wire that is having its current measured is irrelevant. The current transformer does not measure the voltage or protect against it.
     
  3. crutschow

    Expert

    Mar 14, 2008
    13,045
    3,244
    The wire carrying the high voltage current needs to have high voltage insulation where it passes through the current transformer, of course. So the current transformer main parameter of interest is the maximum current you want to detect.
     
    #12 likes this.
  4. #12

    Expert

    Nov 30, 2010
    16,339
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    This might mean the current transformer needs a big hole in the center to allow that much insulation. Think about what kind of insulation you have available that will stop 11,000 volts.
     
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