CT Calculation

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maa2511977 Participant Join Date: Oct 2010 Location: EGYPT Posts: 3	CT Calculation 10/01/2010 7:30 AM
	I want the methods for selecting any CT (CURRENT TRANSFORMER)
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Anonymous Poster	#1 Re: CT Calculation 10/01/2010 8:19 AM
	It is what do with PT too - Available Input (current here) - Required Output (the value is dependent on the meter/ load) ratio of both to the nearest standard size available unless you want a custom made (eg 100/5) UD15
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TonyS Guru Join Date: Aug 2010 Location: Resting under the Major Oak Posts: 4347 Good Answers: 181	#2 Re: CT Calculation 10/01/2010 8:59 AM
	Open a catalogue and pick one. (You did say any)! Give more information you may get a better answer, if you ask nicely. __________________ The reports of my death are greatly exaggerated.
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electricalexpert65 Guru Join Date: Oct 2009 Posts: 2061 Good Answers: 169	#3 Re: CT Calculation 10/01/2010 9:59 AM
	Type of primary (Bar or Wound or Window) No. of cores (secondaries) Ratio of each secondary Accuracy Class of each of the secondaries Rated Burden for each secondary Insulation Level
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Tanuja Active Contributor Join Date: Sep 2010 Location: United Arab Emirates Posts: 12 Good Answers: 2	#4 Re: CT Calculation 10/01/2010 2:56 PM
	Selection of CTs depends upon its usage, whether for metering or protection. Class of accuracy, VA burden and palatability to instrument safety factors need to be considered incase of metering CTs. In case of protection CTs, linearity factor w.r.t its primary current and accuracy factors need to be considered. Metering CTs are expressed in terms of Class 1 or Class 3 where as protection cts are expressed as 5P10 or 5P15 or 5P20 or 10P10 etc. The first digit stands for the class of accuracy and P stands for protection and the last two digits stands for linearity.
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biswanath.das Power-User Join Date: Oct 2006 Location: Kolkata, India Posts: 447	#5 Re: CT Calculation 10/05/2010 9:10 AM
	Refer IEC 60044-1 & 2. This standard gives elaborate CT sizing Calculation. Part 2 gives practica example. Go through. __________________ BNDas
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sridharganasen Associate Join Date: Oct 2009 Posts: 47	#6 Re: CT Calculation 10/05/2010 12:09 PM
	what you mean select ,mechanically, electrically, physically or design
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Anonymous Poster (1); biswanath.das (1); electricalexpert65 (1); sridharganasen (1); Tanuja (1); TonyS (1)

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