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amit goyal
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Engineering Fields - Power Engineering - New Member

Join Date: Feb 2015
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how to calculate multiplying factor if meter ctr is -/5?

02/26/2015 6:09 AM

hi,

what is the multiplying factor for 3 ph 4 wire kwh meter if line ctr is 1000/1A, ptr 3*240V and meter ctr is -/5 A, ptr is 3*240V?
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SolarEagle
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#1

Re: how to calculate multiplying factor if meter ctr is -/5?

02/27/2015 6:33 PM

bye....

https://electricalnotes.wordpress.com/2011/04/16/current-transformer/

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7anoter4
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#2

Re: how to calculate multiplying factor if meter ctr is -/5?

03/23/2015 7:52 AM

Let's say the primary current is 1000 A. Then the meter receives 1 A and interprets it as 1000 A.

Now, if CT ratio will be 1000/5 and the primary current will be 1000 A too, the meter receives 5 A and interprets it as 5000 A. So, in this case you have to divide the reading by 5.

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