Step-Potential and Grounding Grid Educational Tool

Fault Current (kA)

10 kA

Fault Clearing Time (s)

0.5 s

Soil Resistivity (Ω·m)

100 Ω·m

Crushed Rock Resistivity (Ω·m)

3000 Ω·m

Crushed Rock Thickness (m)

0.10 m

Grounding Grid Depth (m)

0.50 m

Grounding Grid Density (conductors/m)

0.50 conductors/m

Step Size (m)

0.30 m

Body Weight (kg)

70 kg

Step Frequency (steps/s)

1.5 steps/s

Walking Speed (m/s)

0.5 m/s

Calculated Values:

Current Step Voltage: 0 V

Permissible Step Voltage: 0 V

Surface Layer Derating Factor (Cs): 0

CALCULATING...

Legend:

High Potential

Medium Potential

Low Potential

Very Low Potential

Soil

Crushed Rock

Voltage Gradient Plot:

Position along ground (m) with red dots for foot positions

Current Flow in Legs (mA):

Red = current in Left Leg, Blue = current in Right Leg (negative indicates opposite direction)

Step Potential Circuit Diagram:

Ground fault path through soil & rock, up left leg, across body, down right leg, and back to earth

Step Potential Equation (IEEE 80):

E_step = (1000 + 6C_sρ_s) (0.116 / √t_s) (W / 50)

Leg currents are computed from the simplified circuit bridging the two foot voltages via foot + body resistances.