Current transformer CT test procedure

Main keywords and important concept point for this articles are transformer testing, what is current transformer, ct test, primary injection test.

Current transformer CT test procedure

This test is considered as one of the main test, it’s aimed to test:

  • Current transformer ratio.
  • Current transformer polarity.
  • Burden of current transformer.
  • Knee point of current transformer.
  • Current transformer winding resistance.
  • Magnetization curve of current transformer.
  • Megger test (insulation test).

Required Equipment for Current Transformer

  • Current transformer (CT) analyzer.
  • Megger.

Mechanical check and visual inspection of current transformer

  • Check tightness of all connection.
  • Check ferrules.

Main keywords and important concept point for this articles are transformer testing, what is current transformer, ct test, primary injection test.

Current transformer analyzer connection

  • CT analyzer has 4 leads, two should be connected to primary side which contains primary side of
    CT and other two should be connected to secondary side of CT which you want to check its ratio.
  • After connecting CT analyzer through laptop and using CT analyzer software, test can be started
    and result can be printed out for CT ratio, CT polarity, CT burden, CT knee point & CT winding
    resistance.
  • This result should be compared with current transformer factory test and be sure that result within
    acceptable tolerance.
  • To measure the burden: Inject 1 ampere on secondary side of CT, and using multi-meter you can
    measure voltage calculate burden by multiply voltage and current and compare it with CT burden.
  • To test insulation: Using megger by 1 kilo volt injection for 1 minute, this test should be done.
    between primary to secondary and secondary to secondary But for Primary to ground 5 kilo volt
    injection for 1 minute.
  • See figure below which shows CT analyzer connection for CT TEST.

ct test

Main keywords and important concept point for this articles are transformer testing, what is current transformer, ct test, primary injection test.

 

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