Fault Current Level

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mansuralaa47 Associate Join Date: Dec 2013 Posts: 25	Fault Current Level 07/13/2014 6:14 AM
	Hi Guys,I am not a designer.I came to know that prior to design the power system of any building of big power consumption and define the setting values of the earth leakage relays , a specific calculation is required to estimate the Fault Current Level.Is it correct ?If yes , may I get please a simplified methodology for the same ? Best Regards
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lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#1 Re: Fault Current Level 07/13/2014 10:21 AM
	A simple search produced 2,560,000 examples in .35 seconds, such as: Electrical Fault Level Calculations Using the MVA Method Fault Calculations - Introduction - myElectrical FAULT LEVEL CALCULATIONS - SARI/Energy
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Shyam Guru Join Date: Aug 2006 Location: AM-51, Deen Dayal Nagar, Gwalior, Madhya Pradesh, MP 474001, India Posts: 3418 Good Answers: 32	#2 In reply to #1 Re: Fault Current Level 07/14/2014 4:13 AM
	Hi lyn: First Link did not open but the last link looks pretty good. You are very helpful Santa. __________________ Prof. (Dr.) Shyam, Managing Director for Sensors Technology Private Limited. Gwalior, MP474001, India.
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lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#6 In reply to #2 Re: Fault Current Level 07/14/2014 1:11 PM
	OOPS, It's a PDF that must be downloaded. It just worked fine for me. Good luck.
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Shyam Guru Join Date: Aug 2006 Location: AM-51, Deen Dayal Nagar, Gwalior, Madhya Pradesh, MP 474001, India Posts: 3418 Good Answers: 32	#7 In reply to #6 Re: Fault Current Level 07/15/2014 12:35 AM
	Hi lyn: Yes, this time it worked well. In previous attempt, it said server problem. Never mind. We know that computers reboot at time and go in hibernation as well. Information is pretty good. __________________ Prof. (Dr.) Shyam, Managing Director for Sensors Technology Private Limited. Gwalior, MP474001, India.
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V.I.Abraham Guru Join Date: May 2007 Location: Pune , India Posts: 875 Good Answers: 42	#8 In reply to #1 Re: Fault Current Level 07/15/2014 6:37 AM
	Hi Iyn, All the links are good and informative .Thanks
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Crabtree Guru Join Date: Jul 2007 Location: Commissariat de Police, Nouvions, occupied France, 1942. Posts: 2599 Good Answers: 77	#3 Re: Fault Current Level 07/14/2014 6:30 AM
	Do you use a national electrical code where you are? Do you have an Electrical Designer who knows how to apply it? __________________ Good moaning!
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mansuralaa47 Associate Join Date: Dec 2013 Posts: 25	#4 In reply to #3 Re: Fault Current Level 07/14/2014 7:55 AM
	Yes for both questionBest Regards
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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	#5 Re: Fault Current Level 07/14/2014 8:17 AM
	As an Electrical Designer is attached to the project, that individual would be the best one to ask. __________________ "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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Anonymous Poster #1	#9 Re: Fault Current Level 10/09/2014 3:12 PM
	Hi! I think that it is not always straightforward to calculate the fault currents. You can simplify the calculation in case the power system studying is small and its voltage level under 110kV. On the other hand, when study a HV power system, you should take the advantage of power system software to carry out the calculation. It not only help you save time, but also make you convenient when using it. In your situation, you want to determine the values of earth leakage currents. Thus, you have to calculate single-line to ground fault currents that are utilized to set protective relays. To see an example of asymmetrical short-circuit calculation, refer to this link http://www.psa-outline.com/asymmetrical-short-circuit-calculation-simulation/ Notes that: I don't mention the case of low voltage systems.
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Anonymous Poster (1); Crabtree (1); lyn (2); mansuralaa47 (1); PWSlack (1); Shyam (2); V.I.Abraham (1)

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