Project: ETAP Page: 1
Location: 19.0.1C Date: 01-31-2025
Contract: SN:
Engineer: Study Case: estudio#1 Filename:
Malla-tierra-subestacion3
Mva
Electrical Transient Analyzer Program
Ground Grid Systems
IEEE Std 80-2000/2013
Number of Ground Conductors: 8
Number of Ground Rods: 8
Total Length of Ground Conductors: 256.00 ft
Total Length of Ground Rods: 52.00 ft
Total Computational Time: 0.00 minutes
Frequency: 60,0
Unit System: English
Project Filename: Malla-tierra-subestacion3Mva
Output Filename:
C:\Users\PC8\Desktop\Malla-tierra-subestacion3Mva\Malla Subestacion Princip_estudio#1.GR
1S
Project: ETAP Page: 2
Location: 19.0.1C Date: 01-31-2025
Contract: SN:
Engineer: Study Case: estudio#1 Filename:
Malla-tierra-subestacion3
Mva
Ground Grid Input Data
System Data
Short-Circuit Current Fault Duration (Seconds)
Total Sf Cp Tf Tc Ts
Ambient Fault Division Projection for for Sizing for
Freq. Weight Temp. Current Factor Factor Total Fault Ground Available
Hz kg °C kA X/R % % Duration Conductors Body Current
60,0 70 40.00 2.000 1.00 100.0 100.0 0.50 0.50 0.50
Soil Data
Surface Material Upper Layer Soil Lower Layer Soil
Resistivity Depth Resistivity Depth Resistivity
Material Type ohm.m ft Material Type ohm.m ft Material Type ohm.m
Gravel 8534.4 0.500 Moist soil 100.0 5.00 Dry soil 1000.0
Material Constants
Resistivity of Thermal
r Factor Fusing Ground Conductor Capacity
Conductivity @ 20 °C K0 @ Temperature @ 20°C Per Unit Volume
Conductor/Rod Type % 1/°C 0 °C °C micro ohm.cm J/(cm³.°C)
Conductor & Rod Copper, annealed soft-drawn 100.0 0.00393 234.0 1083.0 1.72 3.42
Rod Data
Diameter Length No. of Cost
inch ft Rods Arrangement $/Rod
0.750 6.50 8 Rods Throughout Grid Area 100.00
Grid Configuration
Number of Conductor Separation ft
Conductor
Grid Length ft
Size Depth in X in Y in X in Y Cost
AWG/kcmil ft Lx Ly Direction Direction Direction Direction $/ft
4/0 1.64 32.00 32.00 4 4 10.7 10.7 3.30 Shape: Rectangular
Cost
Conductor Rod
Total Total Length Cost Total Total Length Cost Total Cost
No. ft $ No. ft $ $
8 256 844.80 8 52 800.00 1644.80
Project: ETAP Page: 3
Location: 19.0.1C Date: 01-31-2025
Contract: SN:
Engineer: Study Case: estudio#1 Filename:
Malla-tierra-subestacion3
Mva
Ground Grid Summary Report
Rg GPR
Touch Potential Step Potential
Ground Ground
Resistance Potential Rise Tolerable Calculated Tolerable Calculated
ohm Volts Volts Volts % Volts Volts %
3.500 7018.6 2424.0 1595.4 65.8 9030.0 1641.1 18.2
Total Fault Current: 2.000 kA Reflection Factor (K): -0.977
Maximum Grid Current: 2.005 kA Surface Layer Derating Factor (Cs): 0.775
Decrement Factor (Df): 1.003
Report of Intermediate Constants for IEEE 80 Methods
- Correction factor for grid geometry regarding touch voltage (Kim): 1.236
- Correction factor for grid geometry regarding step voltage (Kis): 1.236
- Spacing factor for touch voltage (Km): 0.678
- Spacing factor for step voltage (Ks): 0.477
- Corrective weighting factor that adjusts for the effects of inner conductors on the corner mesh (Kii): 1.000
- Constants 1 related to the geometry of system (K1): 1.368
- Constants 2 related to the geometry of system (K2): 5.625
