CR4 - Thread: Class 0.3 CT for Revenue Metering

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Anonymous Poster #1	Class 0.3 CT for Revenue Metering 08/12/2012 1:50 AM
	For one of the projects, i have used class 0.2 CT(Current transformers) for revenue metering, since class 0.3 was the requirement. Now do i have to use class 0.2 Energy meters for revenue metering? or can i use class 1 energy meters , since i have already chosen the correct CT. thank you
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TonyS Guru Join Date: Aug 2010 Location: Under the Major Oak Posts: 3054 Good Answers: 115	#1 Re: Class 0.3 CT for Revenue Metering 08/12/2012 8:53 AM
	Ask your tutor! __________________ Pessimists are rarely disappointed.
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lyn Guru Join Date: Oct 2008 Location: 34° 34' 21.60" N, 92° 55' 42.28" W Posts: 20896 Good Answers: 783	#2 Re: Class 0.3 CT for Revenue Metering 08/12/2012 9:42 AM
	Based on your logic, why not? That will give you greater accuracy. __________________ Luck comes and goes. Skill is forever. Intelligence either is, or it ain't. lyn
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Wal Guru Join Date: Jun 2011 Location: Phnom Penh Posts: 2371 Good Answers: 66	#3 Re: Class 0.3 CT for Revenue Metering 08/13/2012 1:41 AM
	Perhaps OP could tell us what the difference is between these classes.... __________________ Difficulty is not an obstacle it is merely an attribute.
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rudy.leurs Power-User Join Date: May 2007 Location: Flanders (Belgium) Posts: 293 Good Answers: 17	#4 Re: Class 0.3 CT for Revenue Metering 08/13/2012 5:17 AM
	The class gives the value of the measuring error. It has been a long time ago, but I think class 1 equals to 1% measuring error. Class 0.2 equals to 0.2 % measuring error. According this, you can not go for a class 1 measuring instrument (which will be cheaper ..); A chain is as strong as the weakest point.. __________________ http://www.leurs-electro.be
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electricalexpert65 Guru Join Date: Oct 2009 Posts: 1857 Good Answers: 143	#5 Re: Class 0.3 CT for Revenue Metering 08/21/2012 9:13 PM
	You must use a class 0.2S (not even 0.2, I would say) for the CT as well as for the meter for tariff metering. But, well, as your spec. was Class 0.3, you have already gone for a better accuracy CT with your Class 0.2 CT. But, here only the CT will be accurate. If you "marry" a Class 1.0 Meter to this, the meter will still have its errors pertaining to its class. So, it is always better to have the meter & the CT of the same accuracy class.
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electricalexpert65 (1); lyn (1); rudy.leurs (1); TonyS (1); Wal (1)

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