Step Potential Probability Current for Zone II Calculator

Calculate Prospective Body Current in Zone II

Fault Current (I_f) *

Amperes

Maximum fault current expected in the zone.

Soil Resistivity (ρ) *

Ohm-meter

Average resistivity of the underlying soil.

Surface Layer Resistivity (ρ_s) *

Ohm-meter

Resistivity of the protective surface layer (e.g., gravel).

Surface Layer Thickness (h_s) *

Meters

Thickness of the protective surface layer.

Human Body Resistance (R_h) *

Ohms

Typical resistance of a human body.

Effective Grounding System Resistance (R_{g_effective}) *

Ohms

Effective resistance of the grounding system for step potential calculation.

Step Voltage Distribution Factor (K_step) *

Dimensionless

Factor reflecting how GPR distributes as step voltage (typically 0.3-0.7).

Utilize our Step Potential Probability Current for Zone II Calculator to quickly determine the prospective body current a person might experience due to step voltage in high-risk electrical environments. This tool is essential for assessing and mitigating electrical shock hazards, ensuring compliance with safety standards for substations and industrial facilities.

Formula:

The calculation for the Prospective Body Current (I_body) in Zone II involves several key parameters, derived from IEEE Std 80 principles:

1. Current Reduction Factor (C_s):
C_s = 1 - (0.09 * (1 - ρ / ρ_s)) / (2 * h_s + 0.09)

2. Effective Foot Resistance (R_f):
R_f = 6 * C_s * ρ_s

3. Ground Potential Rise (GPR):
GPR = I_f * R_{g_effective}

4. Actual Step Potential (V_{step_actual}):
V_{step_actual} = GPR * K_step

5. Prospective Body Current (I_{body_prospective}):
I_{body_prospective} = V_{step_actual} / (R_h + 2 * R_f)

I_f: Fault Current (Amperes)
ρ: Soil Resistivity (Ohm-meter)
ρ_s: Surface Layer Resistivity (Ohm-meter)
h_s: Surface Layer Thickness (Meters)
R_h: Human Body Resistance (Ohms)
R_{g_effective}: Effective Grounding System Resistance (Ohms)
K_step: Step Voltage Distribution Factor (Dimensionless)

Electrical and Safety Tools

Step Potential Probability Current for Zone II Calculator

Calculate Prospective Body Current in Zone II

Calculation Results

Formula:

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