Bus Bar Transposition

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electricalexpert65 Guru Join Date: Oct 2009 Posts: 2061 Good Answers: 169	Bus Bar Transposition 12/07/2012 11:30 PM
	I have a 4000A, TPN (Three phase & Neutral) 415V, 50 Hz. bus duct with Aluminium Bus bars. I have one run of bar per phase. To reduce heating due to skin effect/proximity effect, I propose to transpose the RYB Bus bars at regular intervals. If the bus duct length is 30 meters, what is the suggested interval of trasposition of the bus bars?
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Tornado Guru Join Date: May 2009 Location: Richland, WA, USA Posts: 21017 Good Answers: 795	#1 Re: Bus bar transposition 12/07/2012 11:49 PM
	31 meters... __________________ In vino veritas; in cervisia carmen; in aqua E. coli.
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ramvinod Guru Join Date: Jun 2007 Location: chennai,India Posts: 592 Good Answers: 19	#2 Re: Bus Bar Transposition 12/08/2012 11:04 PM
	Please let us know size of the bus bar.For 4000 Amps no single bus bar can carry this much current.Even 1 number 10 x 1/2 inch can carry 3640 Amps for an ambient temperature of 35deg C .By interleaving the busbars you can reduce the deration but the open air current carrying capacity can not be altered. The above data taken from book Aluminum busbars by Thomas & Rata __________________ Ramesh,Freelance Electrical/automation Consultant
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peterd Power-User Join Date: Dec 2005 Location: Willenhall, UK Posts: 159	#6 In reply to #2 Re: Bus Bar Transposition 12/10/2012 8:36 AM
	Sinlge 300x16 is ok for 4000A __________________ A day without a smile is a day lost
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welderman Guru Join Date: Sep 2007 Posts: 1601 Good Answers: 58	#3 Re: Bus Bar Transposition 12/08/2012 11:23 PM
	The major degradation of your bus bars is caused by temperature rise related to the power dissipated in them. Use larger bus bars to reduce the power, cool the bus bars, or use copper bars. Heating due to skin and proximity effect will not be altered by transposing the bars.
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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	#4 Re: Bus Bar Transposition 12/10/2012 5:29 AM
	"The bars are too sma-all Dear Lysa Dear Lysa The bars are too sma-all Dearl Lysa Too small." __________________ "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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welderman Guru Join Date: Sep 2007 Posts: 1601 Good Answers: 58	#5 In reply to #4 Re: Bus Bar Transposition 12/10/2012 8:31 AM
	Then grow them dear expert dear expert Then grow them dear expert Grow them.
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peterd (1); PWSlack (1); ramvinod (1); Tornado (1); welderman (2)

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