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Anonymous Poster

Earth Resistance Values

06/16/2010 6:13 AM

What are the values of earth resistance of following installation 1) 33kv and below class sub stations and transmission lines 2) 66kv class sub stations and transmission lines 3)110kv class sub stations and transmission lines 4)220kv and above class sub stations and transmission lines
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Anonymous Poster
#1

Re: earth resistnce values

06/16/2010 8:39 AM

How much is the marks in total that you are going to give the answer??/
Reply Score 1 for Off Topic
V.I.Abraham
Guru
Safety - ESD - New Member India - Member - New Member Engineering Fields - Energy Engineering - New Member

Join Date: May 2007
Location: Pune , India
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#2

Re: earth resistnce values

06/16/2010 8:43 AM

Please refer IEEE 80
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Anonymous Poster
#3
In reply to #2

Re: earth resistnce values

06/16/2010 10:33 AM

If I had that I wouldnt ask you here!!.... Have you read that??,,,
Reply Score 2 for Off Topic
V.I.Abraham
Guru
Safety - ESD - New Member India - Member - New Member Engineering Fields - Energy Engineering - New Member

Join Date: May 2007
Location: Pune , India
Posts: 875
Good Answers: 42
#5
In reply to #3

Re: earth resistnce values

06/19/2010 2:11 PM

Dear friend If I do not have a copy I would not have adviced you. For a good engineer possession of such documents are essential.Read clause 14.1 of IEEE 80 . Sorry I am not supposed to reproduce here but I qute the contents below for your information.

"A good grounding system provides a low resistance to remote earth in order to minimize the GPR. For most transmission and other large substations, the ground resistance is usually about 1 Ω or less. In smaller distribution substations, the usually acceptable range is from 1 Ω to 5 Ω, depending on the local conditions."

Note .

Please be more polite in making coments that is the decency in a forem like this.
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hithuanand
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India - Member - New Member Engineering Fields - Electrical Engineering - New Member

Join Date: Apr 2010
Location: Asia/India
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#4

Re: Earth Resistance Values

06/16/2010 11:38 AM

It was 5ohms when we measured before installing 15mva tfr for a 110/11kv substation here.
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