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coolyaar
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Join Date: Jul 2011
Posts: 286
Good Answers: 1

Switchyard Gravel

12/27/2011 8:35 AM

substation switchyards surface is often covered with small sized stones (mostly gravel type ).what is the technical reason for it ?
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KJK/USA
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United States - Member - Member Engineering Fields - Electrical Engineering - Electrical Construction

Join Date: Apr 2010
Location: Mid Western USA - The Corn Belt
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Good Answers: 58
#1

Re: Switchyard Gravel

12/27/2011 8:51 AM

C6 crushed stone is cheaper than concrete!

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electricalexpert65
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Join Date: Oct 2009
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#2

Re: Switchyard Gravel

12/27/2011 9:02 AM

To increase the tolerable step potential and tolerable touch potential. Pl. refer to IEEE 80.
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msamad
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Join Date: Feb 2009
Location: Houston, USA
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#3
In reply to #2

Re: Switchyard Gravel

12/27/2011 9:30 AM

In addition, it also helps retarding the evaporation of moisture from the topsoil layer underneath the gravel during dry weather condition. This eventually helps to maintain better grounding resistance (low ground resistance).

Refer to section 7.4 and 12.5 of IEEE 80.

- MS

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dhayanandhan
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Engineering Fields - Mechanical Engineering - New Member

Join Date: May 2008
Location: CHENNAI, TAMIL NADU, INDIA.
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#4

Re: Switchyard Gravel

12/29/2011 12:03 PM

To avoid vegetation and growth of grass.

Dhayanandhan.S
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pvcr4
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Join Date: Dec 2011
Posts: 1
#5

Re: Switchyard Gravel

12/30/2011 6:39 AM

Snakes will make shot circuit in the switch yard. As snakes are not able to move on the small stones so gravel(small stones) is provided. This is also one of the reason.
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dhayanandhan (1); electricalexpert65 (1); KJK/USA (1); msamad (1); pvcr4 (1)

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