Calculating Open Circuit Voltage Across CT Terminals

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S M Subba Rao Participant Join Date: Feb 2018 Posts: 2	Calculating Open Circuit Voltage Across CT Terminals 09/09/2019 10:32 AM
	How can the voltage resulting across the secondary terminals of a current transformer be calculated when the secondary wire is accidentally open-circuited? In what way can such a situation adversely affect the current transformer?
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Brave Sir Robin Guru Join Date: May 2007 Location: Annapolis, Maryland Posts: 7940 Good Answers: 458	#1 Re: Calculating Open Circuit Voltage Across CT Terminals 09/09/2019 1:04 PM
	Start by reading this: https://voltage-disturbance.com/power-engineering/open-circuit-current-transformer-characteristics/ https://static.selinc.com/assets/Literature/Publications/Technical%20Papers/6633_OpenCircuitedCT_DC_20140310_Web2.pdf?v=20180918-173606 And if you have a window style CT, there is 85 pages of material to digest here: https://www.nrc.gov/docs/ML1713/ML17137A031.pdf
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#2 Re: Calculating Open Circuit Voltage Across CT Terminals 09/10/2019 3:20 AM
	<...In what way can such a situation adversely affect the current transformer?...> Simple. The insulation can break down. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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Rixter Guru Join Date: Apr 2010 Location: About 4000 miles from the center of the earth (+/-100 mi) Posts: 9912 Good Answers: 1141	#3 Re: Calculating Open Circuit Voltage Across CT Terminals 09/10/2019 3:42 PM
	It's probably the breakdown voltage of the insulation...
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