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iqbal ahmed
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CT Short Links

12/18/2010 1:31 AM

what is the scope of keeing ct links shortened prior to commissioning?
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JohnDG
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#1

Re: CT short links

12/18/2010 4:25 AM

If the power is applied with the CT output open circuit, the voltage across the CT terminals will rise to a value approx. equal to primary voltage x (current reduction ratio).

e.g. with a 5/1000 CT, ratio is 200:1, so 400V not primary would give 80000V at CT terminals.

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JohnDG
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#2
In reply to #1

Re: CT short links

12/18/2010 5:19 AM

s.b. "400V on primary ..."

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PWSlack
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#3
In reply to #1

Re: CT short links

01/03/2011 5:13 AM

That would make the scope "on every occasion", then?

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JohnDG
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#4
In reply to #3

Re: CT short links

01/03/2011 9:13 AM

Once the CT outputs are safely connected to a shunt resistor, the short can be removed.

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