Calculation Tools

9.1 Grounding Resistance Calculator

This calculator estimates the grounding resistance of vertical rod electrodes and horizontal conductor electrodes based on soil resistivity and electrode dimensions. The calculations use simplified formulas suitable for preliminary design; final designs should be verified through detailed analysis and field testing.

Vertical Rod Electrode Resistance
Unit: Ω·m (typical range: 10-1000 Ω·m)
Unit: meters (typical: 1.5-3.0 m)
Unit: meters (typical: 0.016-0.020 m)
Calculation Result:
Horizontal Conductor Resistance
Unit: Ω·m (typical range: 10-1000 Ω·m)
Unit: meters (typical: 20-100 m)
Unit: meters (typical: 0.6-1.0 m)
Calculation Result:

9.2 SPD Selection Calculator

This calculator helps determine appropriate SPD parameters based on system voltage, protection level, and application requirements. The recommendations follow IEC 61643-11 standards and typical industry practices for low-voltage distribution systems.

SPD Parameter Selection
Recommended SPD Parameters:

9.3 Lightning Risk Assessment Calculator

This calculator provides a simplified lightning risk assessment based on building dimensions, location, and occupancy characteristics. The assessment follows principles from IEC 62305-2 risk management standards.

Lightning Strike Risk Assessment
Unit: meters
Unit: meters
Unit: meters
Typical values: 20-80 days/year (varies by region)
Risk Assessment Result:

9.4 Touch and Step Voltage Calculator

This calculator estimates maximum permissible touch and step voltages based on soil resistivity and fault clearing time, following IEEE 80 safety criteria for grounding system design.

Safe Voltage Limits
Unit: Ω·m (crushed rock: 2000-3000, concrete: 100-400, soil: 100-1000)
Unit: seconds (typical: 0.5-1.0 s)
Calculation Result:
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