Different configuration electrodes resistance deduction 1

[HRoomba]

Good afternoon from Spain,

I am interested in knowing the deduction of the earth resistance expression for different earth electrode configurations. For example I've consulted this doc on

http://dl.lib.mrt.ac.lk/bitstream/handle/123/776/93877_5.pdf?sequence=7.html

that shows simple expressions deduced mathematically for a buried rod, a horizontal plate... but I wanted to find a document that studies all the arrangements possible, for example a vertical plate there is missing, and I have found some discrepancies with other resources.

I don't know if you could help me with that, in which case I'd be very grateful.

Thank you very much.

Best regards.
Héctor

 

[cuky2000]

Hi Hector,

Below are additional data used in the USA for different earth (grounding) electrode configurations.

Please notice that some of the formulas may be different probably because was developed based on a regression analysis with approximation. It is suggested to plot the formulas for similar cases and check how large is the discrepancy or similarity in a particular variable range.

1) Electrical Power Research Institute (EPRI):

2) Source: IEEE Std.142

 

[HRoomba]

Thank you very much Cucky2000!
Is it possible that you quote the EPRI document you got that table from so I can look for that?

Thanks and I wish you a great start of the year

Regards,
Héctor

 

[cuky2000]

Hector,

The EPRI's reference requested can be found in Table 4-1; Geometric and Contact Resistance for Typical Surface Electrodes.
Publication:1012313; "Outline of Guide for Application of Transmission Line Surge Arresters—42 to 765 kV"; 2006.

Below is another reference that may be useful.

Likewise, have a happy and healthy new year.
=======================================================================
Additional resource: :

https://www.rd.usda.gov/files/UTP_Bulletins_1751F-802.pdf