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2 x Current transformer what is the reason?

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samuelr

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Hi

I recently saw an AFCI with 2 current transformer built into it. One of them had the Live wire going thru it the other smaller than the first had the the Live and Neutral. I am not sure why they have to sample the same current 2 times and what different would placing the L and N into the same current transformer loop help?
 

The smaller CT, measure the difference between the L and N currents, any difference must be leakage to earth, allowing the return neutral current to be smaller. This would actuate a trip. In the UK its called a RCD, in the states GFLI.
Frank
 

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