Michael Rigby-Jones wrote:

>A previous company I worked for use Rogowski coils for measuring the harmonic content in electric locomotive traction current.  That went up to 10's of kHz.  As the Rogowski coil has no core to cause losses I'd have though it's high frequency response would be far superior to a standard current transformer.
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Can you describe how to make a Rogowski coil? 
David


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