Earthing Grid Resistance IEEE Std. 80 Calculator
This calculator produces the earthing & grounding grid resistance for a substation based on total buried length of conductors, area occupied by the ground grid and depth of the grid.
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Equation for earthing grid resistance
The equation is based on the IEEE Guide for Safety in AC Substation Grounding (IEEE Std 80-2013), section 14.2, equation 57 and essentially combines the resistive properties of a metal plate, conductors and the depth at which it is buried.
\(R_s = \rho\left[ \frac{1}{L_T}+\frac{1}{\sqrt{20A}}\left(1+\frac{1}{1+h\sqrt{\frac{20}{A}}}\right)\right]\)
Where:
A is the area occupied by the ground grid in \(m^2\).
\(\rho\) is the soil resistivity in Ohm.m.
\(L_T\) is the total buried length of conductors in m.
h is the depth of the grid in m.
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