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Anguraj Chelladurai
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Join Date: Nov 2011
Location: Chennai, India
Posts: 38
Good Answers: 2

CT's VA Burden & Rating

11/18/2011 4:47 AM

Can anyone explain about VA Burden and Rating of CT?

Can i use the VA Burden of 7.5 instead of 15? For example, Similarly can we use "600/1A-3 Core CT" instead of "1250/1/1A-3 Core CT"...? and use of "Core:CL:5P10,15VA" instead of "Core:CL:5P10,20VA"...

Regards,

Anguraj

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electricalexpert65
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Join Date: Oct 2009
Posts: 2061
Good Answers: 169
#1

Re: CT's VA Burden & Rating

11/18/2011 8:48 AM

i) The rated burden of a CT secondary winding shall be as close to but not less than the total burden connected to that secondary winding. And, do not forget to include the CT secondary winding's burden, the burden of the connecting leads from the CT to the loads (relays or meters) and the load burden. So, if the actual connected burden (as calculated above) of this CT secondary is less than or equal to 7.5 VA, you may very well opt for a 7.5 VA CT, instead of a 15 VA CT. ii) A strict NO-NO. Definitely one cannot and must not use a 630A CT in place of a 1250A CT. iii) As in (i) above.
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Anguraj Chelladurai
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Join Date: Nov 2011
Location: Chennai, India
Posts: 38
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#2
In reply to #1

Re: CT's VA Burden & Rating

11/19/2011 12:07 AM

Thank you.. From your great response, i have been drifted a bit.. I will go through on that.. If any doubt or clarifications regarding this, i will post.. Please give your kind response.. In addition to that, now i need some materials for more understanding.. Can you provide..?

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electricalexpert65
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Join Date: Oct 2009
Posts: 2061
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#3
In reply to #2

Re: CT's VA Burden & Rating

11/19/2011 12:23 AM

i) Instrument transformers - A reference manual by Kappa Electric ii) Application guide on instrument transformers from ABB website iii) Publication on intrument transformers fom IEEMA Happy reading.
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Anguraj Chelladurai
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Join Date: Nov 2011
Location: Chennai, India
Posts: 38
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#4
In reply to #3

Re: CT's VA Burden & Rating

11/19/2011 12:55 AM

Thank you.. After completing study on that, i will post..

Thank you for your great reply...

Regards,

Anguraj

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