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Anonymous Poster #1

Earth Grid And Pit

09/30/2014 3:24 AM

for earthing calculation we evaluate the grid resistance and pit resistance seperately and then considered both in parallel. But how the parallel concept can be elaborated please help..
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7anoter4
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#1

Re: earth grid and pit

09/30/2014 4:12 AM

Following IEEE 80/2000 ch.14 Evaluation of ground resistance a formula presented by

S.J.Schwarz is usual employed for simplified calculation:

Rg=(R1*R2-Rm^2)/(R1+R2-2*Rm)

Where

R1=ground resistance of grid conductors

R2=ground resistance of all ground rods

Rm=mutual ground resistance between grid conductor and ground rods.

That means they are not exactly parallel as a mutual influence exists.

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SolarEagle
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#2
In reply to #1

Re: earth grid and pit

09/30/2014 2:46 PM

GA ... sounds like a test question....

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