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FADHEL
Commentator

Join Date: Sep 2012
Posts: 58

Short Circuit Current

02/27/2013 5:56 AM

Dear all

We have auto transformer 400/132/11KV,Impedance voltage (HV-LV 250000/3KVA 16.8%)

(HV-TV 75000/3KVA 14.68%)(LV-TV 75000/3KVA 8.77%) ,Rated current(361,1041,2273)Am

Please how can I calculate the short circuit current for tertiary winding(11kv delta connected)

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biswanath.das
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Join Date: Oct 2006
Location: Kolkata, India
Posts: 447
#1

Re: short circuit current

02/27/2013 6:36 AM

Refer Westing House T&D Book.

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lyn
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Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#2

Re: Short Circuit Current

02/27/2013 8:41 AM

Take a course in electricity.
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lyn
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#3

Re: Short Circuit Current

02/27/2013 12:16 PM

Homeworkhelp.com - The Best Place to Find Online Tutors for Live ...
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Carl Pugh
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#4

Re: Short Circuit Current

02/27/2013 12:57 PM

Contact the transformer manufacture.

You cannot calculate the short circuit current with the information given.
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jack of all trades
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New Zealand - Member - Kiwi Popular Science - Weaponology - New Member Engineering Fields - Power Engineering - New Member Engineering Fields - Electrical Engineering - New Member

Join Date: Sep 2006
Location: Auckland, New Zealand
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#5

Re: Short Circuit Current

02/27/2013 1:14 PM

You say you work at a substation, but given the questions you have been asking on CR4 what exactly do you do there?

This really is starting to sound like you don't work there at all and are just some student trying to get answers on homework questions.

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7anoter4
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Join Date: Oct 2012
Location: 100 miles North from the World Center
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#6

Re: Short Circuit Current

02/28/2013 8:31 AM

You can try:

IEC 60909-4 Auto-transformer with three separate units Table 1 Fig.8

IEC 60909-0 ch.3.3.2. Three-winding transformers

IEC 60909-2 ch. 2.3. Table 3C.

However as Carl Pugh already said, it will be better if a trained team- a specialized power station or substation design company will do such a calculation.

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nobodysomebody47
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Join Date: Nov 2011
Posts: 171
Good Answers: 1
#7

Re: Short Circuit Current

02/28/2013 9:25 AM

Check this please

Short Circuit Current Calculation Methods
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RAMConsult
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Engineering Fields - Power Engineering - New Member

Join Date: May 2007
Location: NYC metropolitan area.
Posts: 3230
Good Answers: 444
#8

Re: Short Circuit Current

02/28/2013 3:56 PM

Check out page 29 in the J&P Transformer handbook, good analysis but you'll need an understanding of the per unit system and symmetrical component networks to get it right, there's even an 11kV tertiary case in there.

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7anoter4 (1); biswanath.das (1); Carl Pugh (1); jack of all trades (1); lyn (2); nobodysomebody47 (1); RAMConsult (1)

Previous in Forum: Surge Arrester "Low Current" In Pressure Relief.   Next in Forum: Design DC link capacitor

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