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Charanjeet
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Join Date: Mar 2010
Posts: 7

Earthing for Transformer

04/10/2012 11:49 AM

We are contractor and asked to carry out earthing of 33 KV / 11 Kv Transformer. Can some one tell us the maximum level of fault current for earthing rod to be provided
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Pathfinder Tags: Fault Current
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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.
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Good Answers: 838
#1

Re: Earthing for Transformer

04/10/2012 11:50 AM

The maximum level of fault current is that provided through the circuit protective device(s) at the instant of disconnection. That in turn depends on the rating of the device, which hasn't been disclosed...

"20 Questions", anyone?

http://cr4.globalspec.com/thread/73863

Do hire a qualified local electrical designer before someone gets hurt/killed...

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lyn
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Join Date: Oct 2008
Posts: 42376
Good Answers: 1692
#2

Re: Earthing for Transformer

04/10/2012 12:04 PM

How can you be an electrical contractor when you know nothing about electricity?

Asking total strangers to do your calculations and job for you is unethical, not to mention deadly, if it's wrong.
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electricalexpert65
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Join Date: Oct 2009
Posts: 2061
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#3

Re: Earthing for Transformer

04/10/2012 12:09 PM

The general practice is to limit the earth fault current to the rated full load current of the transformer.
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wareagle
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United States - Member - New Member

Join Date: Jun 2008
Location: Alabama
Posts: 1604
Good Answers: 63
#4

Re: Earthing for Transformer

04/10/2012 2:02 PM

Charanjeet you said "Can some one tell us the maximum level of fault current for earthing rod to be provided"

Are you referring to the maximum fault to earth(dirt) through the ground rod?

Please respond.
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TonyS
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United Kingdom - Member - New Member

Join Date: Aug 2010
Location: Resting under the Major Oak
Posts: 4347
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#5

Re: Earthing for Transformer

04/10/2012 9:44 PM

I'll say one thing for Charanjeet, he's versatile.

Have a look at his previous posts

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Users who posted comments:

electricalexpert65 (1); lyn (1); PWSlack (1); TonyS (1); wareagle (1)

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