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Raif-Samir
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Join Date: Aug 2009
Posts: 5

Electrical engineer

04/08/2010 7:35 PM

how to select the ammeter with co-ordination of the current transformer?
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JRaef
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Re: Electrical engineer

04/08/2010 8:54 PM

Actually, I do it the other way around. I select the Ammeter for what I want to display, then I select a Current Transformer so that the normal value I am looking for falls roughly into the middle of the Ammeter range. For example, if I have a system that can deliver 1000A but normally puts out about 600A, I select an ammeter that will show 0-1200A so that my normal reading is in the middle but I have some room to show overload. then I use a 1200:5 CT.

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Tornado
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#2

Re: Electrical engineer

04/08/2010 10:25 PM

GA, and good practice. The ammeter actually measures 0-5 amps; in effect the selection involves simply a dial to match the CT ratio.

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