Soil Resistance Calculation After Using Rectangular Ground Mat.

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src982

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Hello,

I am recent graduate Engineer and working in the field of lightning protection and grounding. I have to design the grounding system for typical value of resistance ( less than 25 Ohm or 5 Ohm mainly for telecommunication towers, buildings). The resistance calculation for various configuration are given in IEEE Std 142-1991 with variation of soil resistivity, conductor size and depth of burial.

In addition, I am not able to get the formula to calculate the resistance using Rectangular Ground Mat with variation of soild resistivity, Number of Meshes along X -and Y axis, burial depth and conductor specification. If anyone suggest me the approximate formula to determine the resistance using Recantagular ground mat, it would be of great help.

Thank you.
 
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Pronto Pup

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You might try RedVector.com, they have an on-line course titled "Electrical Protection Grounding". I believe the cost was about $80. There are multiple calculations required for a rectangular design. I believe they had an example of the calculations for a small communications building in the course.
 
kingpb

kingpb

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Location
SE USA as far as you can go
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Engineer, Registered
ETAP works well, so does CDEGS.

What you are trying to do can get quite complex depending on your soil model and resistivity values.

Have you gotten a soils report with resistance measurements? If not, this should be standard protocol for each site. This information is critical to developing your model.
 
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src982

Member
Thanks for the response.

Thanks for the response.

Thank you for the suggestion. Yep, I am using WinIGS software and I can access the resistance simply from modeling the grounding system. However, I am considering to have formula so that I can calculate without software which is required for me.
 
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