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Earth Grounding - Actual Touch Voltage

Earth Grounding - Actual Touch Voltage

Earth Grounding - Actual Touch Voltage

(OP)
Hi,
I've been working on the sizing of the Earth Grounding of a Substation. To do so, I need to calculate the permissible touch and step voltages.
I know IEE Std. 80-2000 teaches how to calculate these values. However, would someone happen to know how I can calculate the actual touch and step voltages that will occur throughout the earth ground during a short-circuit? Is there any standard or book that talks about the equations?

Currently I'm using a software called 'TecAt Plus' to calculate these voltages. But the software has a poor interface and sometimes doesn't work well. I was thinking that maybe I could make these calculations myself using MATLAB.
Thank you in advance.

RE: Earth Grounding - Actual Touch Voltage

IEEE Std 80 has simplified calculations of step- and touch voltage that can be used for simple grids in uniform soil.

RE: Earth Grounding - Actual Touch Voltage

I agree with jghrist, IEEE-80/2000 give a simplified method to calculate the GPR, touch and step potentials. Still there are other IEEE standards-as IEEE-665, for instance-based on these recommendations. Even some of sophisticated softwares are based on this standard –and supplemental, adding other information as short-circuit calculation, grounding resistance ,material recommendation and other. They are other systems-epri or EDSA standards, for instance-based on finite element analyze or the conductance matrix approach- see:
http://www.poweranalytics.com/designbase/pdf/Groun....
But, I think, taking into consideration the reduced accuracy of grounding resistivity measuring - and change of the grounding resistance with weather, metallic and reinforcing concrete embedded in the grounding area and other-the IEEE-80/2000 in two layer grounding strata method , it is accurate enough.

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