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Muthuvel
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Join Date: Jun 2012
Posts: 115

Current Transformer for Energy Meter

11/11/2013 2:08 AM

Why the current transformer is not suggested to fix for A feeder's energy recording which is rated below 63A?
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dvmdsc
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Join Date: Mar 2010
Location: In the pool because it is too hot.
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#1

Re: Current Transformer for energy meter.

11/11/2013 2:16 AM

I don't know about others, but Shangamo has these CT's and meters. (electromechanical types)

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TonyS
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United Kingdom - Member - New Member

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#2

Re: Current Transformer for Energy Meter

11/11/2013 10:28 PM

Expense.

Why buy a CT when the current can safely be handled by the meter?

You don't state a voltage. Above normal LV supplies then a CT is a must.

As per usual, not enough information!

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pnaban
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Join Date: Jun 2010
Location: srilanka
Posts: 2725
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#3

Re: Current Transformer for Energy Meter

11/11/2013 10:42 PM

For higher current ratings size of CT will go out of hand,therefore CT is used.

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itsphani99
Active Contributor
Engineering Fields - Power Engineering - Thermal Power Plant Electrical Engineer

Join Date: Sep 2010
Location: INDIA
Posts: 18
#4

Re: Current Transformer for Energy Meter

11/14/2013 12:37 AM

Dear Muthuvel, For any 3ph/3ph-4W static energy meter CT is must. Because your energy meter is not able to carry 63 Amp of load current through it. But some small energy meters up to 40 Amp (which i have seen) are designed for 40 Amp current to flow through it. Otherwise, normally all energy meters are designed for 1 Amp / 5 Amp load only.
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dvmdsc (1); itsphani99 (1); pnaban (1); TonyS (1)

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