current transformer earthing

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hkchand Participant Join Date: Dec 2008 Posts: 3	current transformer earthing 03/12/2009 5:26 AM
	Why we earthed one secondary terminal of current transformer
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sb Guru Join Date: Mar 2007 Posts: 2550 Good Answers: 103	#1 Re: current transformer earthing 03/12/2009 7:04 AM
	Why you earthed the best judge is you, But why you should earth: CT , What about VTs (Voltage transformers ?) In case one terminal is not earthed (or in some cases connected to common neutral) what will be the voltage on secondary of both the transformers ? If the emf across secondary coils is V_s, (whether CT or VT) then terminal 1 is at V_s1 and terminal 2 at V_s1+V_s What is V_s1 ? Additionally the OC of CTs create an extremely high voltage on secondary. Also the insulation of the CT is relatively weak earthing takes care of a bit of safety aspect too. __________________ Fantastic ideas for a Fantastic World, I make the illogical logical.They put me in cars,they put me in yer tv.They put me in stereos and those little radios you stick in your ears.They even put me in watches, they have teeny gremlins for your watches
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harry potter Power-User Join Date: Nov 2008 Location: India Posts: 333 Good Answers: 6	#2 Re: current transformer earthing 03/13/2009 1:05 AM
	dear, Earthing of CT secondary common wire is just essential as is required for Transformer neutral . This shall eliminate the neutral of CTs ( Common ) being floated / circulated under un balanced conditions / failure of any one CT. Each phase of CTs shall correctly read the current. This shall eliminate the dangerous over voltages being developed by circulating neutral - & in turn prevent bursting of CTs. __________________ Exploring the Science of Electricity
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