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I disagree

Kurt, I do remember you making this point before. I apologize for not responding then. I got distracted by other things, overworked etc. It slipped away.

Anyway, I see an ideal transformer (without center tap) as being an ideal differential device. It is sensitive only to the difference in voltage between the two ends of the primary. It is that voltage difference that creates current through the winding, thus creating magnetic flux in the core which couples to the secondary. Any voltage that is common to both ends of the primary (referenced to earth, or the core, or anything you choose) will not result in current through the winding. That is the definition of a differential device.

I agree that a ct might be the best practical solution to real-world problems, but I do not agree that it is a necessity for the transformer to be a differential device.

-- Dave

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