Calculators
Substation Grounding Grid — IEEE 80
Grid resistance (Sverak), tolerable step/touch voltages (50 kg or 70 kg), and computed mesh and step voltages for a uniform-soil rectangular grid per IEEE 80-2013.
Standards: IEEE Std 80-2013 (Guide for Safety in AC Substation Grounding), IEEE Std 81-2012 (Earth Resistivity & Ground Impedance), Sverak, J.G., “Simplified Analysis of Electrical Gradients Above a Ground Grid” IEEE Trans. PAS-103 No.1, Jan 1984. Body weight: 50 kg (k=0.116) is the IEEE 80 default; 70 kg (k=0.157) applies only where non-substation personnel access is guaranteed. Km, Ks: simplified forms — for compliance design of large or irregular grids, use ETAP / CDEGS.
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