This spreadsheet intend to calculate size of needed Touch Voltage / Ground current according to the following input parameters.
The document provides calculations for the earthing system of a 110kV switchyard. It includes calculations to determine the size of the main earthing conductor, tolerable touch and step voltages, and total system resistance. The main earthing conductor size is selected as 32mm diameter MS rod based on a fault current of 31.5kA. Tolerable touch and step voltages are calculated as 934.97V and 3247.72V respectively based on parameters like soil resistivity, grid dimensions and fault duration. Total system resistance is calculated using resistance of grid conductors and earth rods along with their mutual resistance.
Touch Voltage / Ground current Calculation
- Calculate Resistance of Each Phase.
- Calculate Resistance of neutral/Ground.
- Calculate Neutral Current and Load.
- Calculate Touch Voltage for Metal part to Earth.
- Calculate Body Resistance and Body Current.
Title : Touch Voltage – Ground Current Calculation
Type : Microsoft Excel Spreadsheet (xlsx)
Size : 97.5 KB
FAQ:
What is the touch voltage formula?
1 it will be seen that the touch voltage, UT = IfZ2 V also exists between the exposed conductive parts of the faulty equipment and those of the healthy equipment fed by another circuit because of the common connection of the protective conductors of both circuits to the main earthing terminal (E) of the installation.
How to calculate ground current?
For 4-wire Wye systems, ground current is calculated as the difference between the measured neutral current and the vector sum of all measured phase currents.
How do you calculate the voltage ground?
Line To Ground Voltage Calculator – Calculator Academy
The following steps outline how to calculate the Line to Ground Voltage. First, determine the line voltage (VL-L) in volts. Next, use the formula VL-G = VL-L / √3. Finally, calculate the Line to Ground Voltage (VL-G).
How do you calculate grounding?
The following basic formulas for the calculation of the loop grounding resistance (R) in a homogeneous soil are given in [7], [8]:(1) R = ρ 4 π A where ρ is the soil resistivity, and A is the area occupied by the loop,(2) R = ρ 4 π A + ρ L T where LT is the total length of the buried conductors, and(3) R = ρ 1 L T + 1 …
