Load Unbalance Effect - CR4 Discussion Thread

Home

Products & Services

Engineering News

Standards

Webinars

Engineering Forum

Login

CR4 Home | Electrical Engineering | Electrical Engineering

10 comments

Rate

Comments: Nested

Anonymous Poster #1	Load Unbalance Effect 12/14/2011 11:12 PM
	plz when we have a 4-wire gen. 220/127 A, 131A 50 KVA and we conect 15 KVA 220 V single phase load between L1-L2 and another 15 KV 220 V load to L2-L3 what will be the distribution current in L1,L2,L3 and also the effect on the gen. thanks
	Reply

Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Join CR4, The Engineer's Place for News and Discussion!

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	#1 Re: Load Unbalance Effect 12/15/2011 3:07 AM
	What is the pass mark? __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
	Reply

KH Member Join Date: Jun 2009 Posts: 6	#2 In reply to #1 Re: Load Unbalance Effect 12/15/2011 7:31 AM
	what do you mean?
	Reply

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	#3 In reply to #2 Re: Load Unbalance Effect 12/15/2011 8:23 AM
	The original poster put up an exam question. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
	Reply

KH Member Join Date: Jun 2009 Posts: 6	#4 In reply to #2 Re: Load Unbalance Effect 12/15/2011 9:40 AM
	Actually it"s not an exam question, really I have a generator 220/ 127 V50 KVA 131A and my load 120 lighting poles [220v,250w/pole] distributed in 1100 m line connected together by a 4*16 mm sq cable and the main supply 380/220V 4wire system ( from city net.), I have to use a gen. with A.T.S. as standby source and I have only the mentioned gen. so I need to know the current values in all lines to check if it" s suitable for the conected cable and the effect of unbalance on the the gen., proposal ATS terminal : [ L3g-N, L2g-L3,L1g-L2 ]. thanks for all
	Reply Off Topic (Score 5)

SolarEagle Guru Join Date: Mar 2007 Location: by the beach in Florida Posts: 33392 Good Answers: 1817	#5 In reply to #4 Re: Load Unbalance Effect 12/15/2011 10:15 AM
	http://www.engineeringtoolbox.com/electrical-systems-t_33.html __________________ All living things seek to control their own destiny....this is the purpose of life
	Reply Off Topic (Score 5)

TonyS Guru Join Date: Aug 2010 Location: Resting under the Major Oak Posts: 4347 Good Answers: 181	#6 Re: Load Unbalance Effect 12/15/2011 1:21 PM
	Line current is easy enough for you to calculate, neutral current is: In=√((Ia² + Ib² + Ib²) - ((Ia X Ib) + (Ia X Ic) + (Ib X Ic))) __________________ The reports of my death are greatly exaggerated.
	Reply

wareagle Guru Join Date: Jun 2008 Location: Alabama Posts: 1604 Good Answers: 63	#7 Re: Load Unbalance Effect 12/15/2011 2:25 PM
	Quote"plz when we have a 4-wire gen. 220/127 A V, 131A 50 KVA and we conect 15 KVA 220 V single phase load between L1-L2 and another 15 KVKVA 220 V load to L2-L3 what will be the distribution current in L1,L2,L3 and also the effect on the gen." Have you heard of vector addition?
	Reply

wareagle Guru Join Date: Jun 2008 Location: Alabama Posts: 1604 Good Answers: 63	#8 Re: Load Unbalance Effect 12/15/2011 2:31 PM
	So KH, are you the imposter Anonymous Poster #1? Why not post the question as KH?
	Reply

wareagle Guru Join Date: Jun 2008 Location: Alabama Posts: 1604 Good Answers: 63	#9 Re: Load Unbalance Effect 12/15/2011 2:50 PM
	KH Quote " Actually it"s not an exam question, really I have a generator 220/ 127 V50 KVA 131A and my load 120 lighting poles [220v,250w/pole] distributed in 1100 m line connected together by a 4*16 mm sq cable and the main supply 380/220V 4wire system ( from city net.), I have to use a gen. with A.T.S. as standby source and I have only the mentioned gen. so I need to know the current values in all lines to check if it" s suitable for the conected cable and the effect of unbalance on the the gen., proposal ATS terminal : [ L3g-N, L2g-L3,L1g-L2 ]." Have I got this right. You are going to have 120 lts connected L-N from the main supply 220 v and you want to connect them L-L 220 V on the generator during outages. Correct?
	Reply

KH Member Join Date: Jun 2009 Posts: 6	#10 In reply to #9 Re: Load Unbalance Effect 12/15/2011 4:52 PM
	yes correct
	Reply

Copy to Clipboard

Users who posted comments:

KH (3); PWSlack (2); SolarEagle (1); TonyS (1); wareagle (3)

	Got Something to Say?
	Ask a Question Start a Discussion

	Search this Forum
	Electrical Engineering: Go

CR4 Sections

	Aerospace
	BioMech & BioMed
	Chemical & Material Science
	Civil Engineering
	Communications & Electronics
	Education and Engineering Careers
	Electrical Engineering
	General Discussion
	Instrumentation
	Manufacturing
	Mechanical Engineering
	New Technologies & Research
	Software & Programming
	Sustainable Engineering
	Transportation

	Site Directories
	Forum Directory Blog Directory User Group Directory RSS Feeds CR4 Rules of Conduct CR4 FAQ Site Glossary Who's Online (50 right now) Show Members