CT Voltage Rating: Ph-Ph or Ph-N?

Discussion in 'General Electronics Chat' started by Mr.Meter, Mar 18, 2016.

  1. Mr.Meter

    Thread Starter New Member

    Jan 24, 2016
    7
    1
    For a CT with the following rating:

    0.3B0.5, 0.6kV, 10kV BIL

    Does that 0.6kV rating refer to the Phase-Phase voltage, or the Phase-Neutral voltage?

    Example: I have a 690/398V secondary coming off a 24940/14400V (3P4W-3P4W) step down transformer.

    The CT's 0.6kV spec is fine for the phase-neutral voltage or 398V, but it is out of range for the phase-phase voltage of 690V. Since the CT's will be installed each on a single phase, I assume the 0.6kV rating is OK. But I am having trouble confirming that.

    Any assistance would be appreciated.
     
  2. KeepItSimpleStupid

    Well-Known Member

    Mar 4, 2014
    1,150
    205
  3. Mr.Meter

    Thread Starter New Member

    Jan 24, 2016
    7
    1
    Thanks for your response. The BIL I understand for the most part. But the actual voltage rating I am concerned about.
    As you mention, the CT will never see 600V with respect to itself. But it will be in a cabinet with 3-phases inside.

    In this instance, the secondaries will be connected to paddles in the Transformer secondary enclosure. The dimensions of which are approximately 4'h x 3'w x 2'd.

    This is all a mock-up project for a job application so I want to make sure I get the voltage rating right
     
  4. Mr.Meter

    Thread Starter New Member

    Jan 24, 2016
    7
    1
    After a lot of digging I found some good information from GE:
    upload_2016-3-18_18-14-3.png
     
Loading...