Can it Handle?

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darkside Participant Join Date: Jul 2014 Posts: 1	Can it Handle? 07/11/2014 3:36 AM
	I have 2 generators rated 150MW each, 138KV, 0.85pf lagging, each with respective outgoing 138KV lines with individual line breakers with a bus tie breaker common to both rated 145KV, 1600A, 40KA/3s. Can my bus tie breaker and line breaker on one line handle 2 generators supplying a total of 300MW power if the other line is on maintenance?
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RAMConsult Guru Join Date: May 2007 Location: NYC metropolitan area. Posts: 3230 Good Answers: 444	#1 Re: Can it Handle? 07/11/2014 9:40 AM
	You need to know the impedances of your system, transformers, and generators in order for you to perform those calculations. And don't forget the generator grounding means and the short circuit mechanical withstand of your buss. __________________ “Tell me and I forget. Teach me and I remember. Involve me and I learn.” Ben Franklin.
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7anoter4 Guru Join Date: Oct 2012 Location: 100 miles North from the World Center Posts: 879 Good Answers: 42	#2 Re: Can it Handle? 07/13/2014 4:04 AM
	I agree, of course, with RAMConsult. However, in a case when one of main breakers is not available but both generators will be in operation then, I think, the tie breaker is not overloaded. Only [one of] the main breakers are [is] 5% continuously overloaded. The short-circuit current -if the generators are islanded [no system connected]-IMO- the short-circuit current will be not more than 6 kA [rms]. __________________ Julius
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jack of all trades Guru Join Date: Sep 2006 Location: Auckland, New Zealand Posts: 8777 Good Answers: 376	#3 Re: Can it Handle? 07/13/2014 3:56 PM
	Congratulations, you win the "MOST OUT OF DEPTH AND DANGEROUS QUESTION OF THE WEEK!!!". I hope this is a homework question, either way your on your own. WTF! __________________ jack of all trades
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Crabtree Guru Join Date: Jul 2007 Location: Commissariat de Police, Nouvions, occupied France, 1942. Posts: 2599 Good Answers: 77	#4 Re: Can it Handle? 07/14/2014 6:34 AM
	Did you ring the bus tie breaker manufacturer and ask? __________________ Good moaning!
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ShawnHoppe Associate Join Date: Jul 2014 Location: I live in USA, Colorado in the houses of 7 Summits Posts: 28	#5 Re: Can it Handle? 07/26/2014 5:12 AM
	Here in these case one will not always trust to the power grid to supply the energy, I don't the one from both will handle two generators supplying a total of 300MV power, due to internet fault the load is being served from a transmission line.
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