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Current transformer rating

Richard Henderson
I wish to use a curren transfomer with a 10A primary and 5A secondary. The circuit is running at 3kV. The transfomer I whs to use is rated at 0.72/3kV. I feel the insulation is irrelevant as I will be passing the cable (with 10kV rated insulation intact) through the centre of the transformer and making no connection whatsoever (other than via a magnetic field which is proportional to current NOT voltage).


However, the manufacturer says that the transformer can only have up to 720V passed through it.


I think the person on th end of the phone is reading from a datasheet but doesn't actually understand it. That said, I am not familiar with CTs, so could be completely wrong.


Any ideas what the facts are here?
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    Ian MacDiarmid:

    The manufacturer of the current ransformer has to assume that it could be used on a uninsulated cable. I guess that is the basis for the apparently conservative voltage rating.


    Ian 




    Thanks Ian, that was the conclusion I'd come to so I've gone ahead with them.

     

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    Ian MacDiarmid:

    The manufacturer of the current ransformer has to assume that it could be used on a uninsulated cable. I guess that is the basis for the apparently conservative voltage rating.


    Ian 




    Thanks Ian, that was the conclusion I'd come to so I've gone ahead with them.

     

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