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Anonymous Poster #1

Transformer Ratio

10/01/2012 9:16 AM

what is the effect of increasing the number of winding by keeping the transformer ratio same (eg. CT ratio 100/1A to 500/5A) ?
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PWSlack
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#1

Re: Transformer Ratio

10/01/2012 9:37 AM

The CT becomes larger than it was, which may become larger than it needs to be.

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Joshi
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#2

Re: Transformer Ratio

10/01/2012 2:43 PM

The turns ratio is based, on the magnetic permeability & the cross-section area of the transformer core.
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bigg
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#3

Re: Transformer Ratio

10/01/2012 8:51 PM

I could be wrong, after all, I'm just a dumb ole ME, but I don't think that going from 100/1 to 500/5 necessarily means that the number of winding turns has increased.
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PeterT
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#5
In reply to #3

Re: Transformer Ratio

10/03/2012 12:16 PM

This is true! While the transformation ratio of a current transformer is often given as a ratio of XXX/5A, the actual winding ratio will be YYY/1A. This is due to the fact that the primary will be one conductor through the window of the CT, with YYY secondary coils wound around it.

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pnaban
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#4

Re: Transformer Ratio

10/01/2012 11:48 PM

cost,size,space required increases and wastage of valuable material.

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