Estimate substation ground grid resistance, ground potential rise (GPR), and a preliminary mesh/step voltage check: IEEE 80 simplified method. For preliminary sizing; final design should be verified with detailed IEEE 80 mesh voltage calculations or grounding analysis software.

// INPUTS

// Results update automatically as you type

// SOIL & GRID

Soil Resistivity ρ (Ω·m)

Grid Area (m²)

Total Buried Conductor Length (m)

Burial Depth (m)

// FAULT DATA

Maximum Grid Current I_g (A)

Fault Clearing Time (seconds)

Surface Layer

Body Weight Case

Grid Resistance (R_g) -Ω

Ground Potential Rise (GPR) -V

Tolerable Touch Voltage -V

Tolerable Step Voltage -V

Status -

Disclaimer: This tool uses the simplified Sverak grid resistance approximation and IEEE 80 tolerable voltage formulas for preliminary design only. GPR is compared against tolerable touch voltage as a screening check: it does not calculate actual mesh or step voltage from grid geometry, which requires full IEEE 80 mesh voltage calculation (Km, Ki, Kii, Kh factors) or grounding analysis software. Always verify final designs against site-specific soil data and detailed IEEE 80 calculations. Found an error or an outdated reference? Let us know at [email protected].

Please check inputs, all values must be positive.

// RELATED ARTICLE

Ground Grid Design Basics: IEEE 80

Touch voltage, step voltage, soil resistivity testing, grid resistance, and conductor sizing: the full design sequence this calculator's screening check fits into.

Read Article →

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Ground Grid Resistance Calculator