Input fields As per ANSI/IEEE Std 80-1986 code • Length of Area Occupied by Earthing Grid • Width of Area Occupied by Earthing Grid • Fault level at Incoming Bus • Incoming Voltage • Outgoing Voltage • Soil Resistivity • Resistance of Main Earthing Mat • Resistance of surface Material (Crushed Rock ) • Thickness of Surface Material (Crushed Rock) • Depth of Earthing Grid Conductor • Diameter of Earthing Grid Conductor • Reference Depth of Grid • Spacing between Parallel Conductor of Grid What this Spreadsheed does? • Program is design as per ANSI/IEEE 80-1986 Code • Calculate Step Potential of Switch yard • Calculate Touch Potential of Switch yard • Calculate Total Length of Earthing Mat Conductor • Calculate Size of Earthing Mat Conductor • Calculate Total No of Earthing Rods.
In this Article and Article ' ', I explained the first method of grounding design calculations: Equations Method and solved examples. And I explained the second method of grounding design calculations: Nomographs Method in Article ' '. Also, I explained the third method of grounding design calculations: Excel Spreadsheets Method in Article ' '. And I explained the forth method of grounding design calculations: By using Tables In Articles ' ' and ' '. Also, I explained the fifth method of grounding design calculations: By using Online Earthing Calculators in Articles ' ' and ' '.
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Today, I will explain the Sixth Method of Grounding Design Calculations: Software Programs Method. You can preview the following Articles for more info. • The formulas used in this program are based on accepted formulas which are the basis of IEEE publications • The formulas used for calculating resistance to Earth are based on modified formulas from Dwight for horizontal electrodes and from Sunde for vertical electrodes.
• The modified formula assumes the top of the vertical electrode is near the surface. • When more than one vertical electrode are calculated, the calculations assume equally spaced ground rods in a straight line and that the spacing between the ground rods is equal to or greater than the length of the vertical Earth electrode. • The formula for calculating the resistance to Earth for the horizontal Earth electrode assumes the electrode is in a straight line. • Both of the horizontal and vertical resistance to Earth formulas are for DC or low frequency. Both sets of equations use, as an input, the diameter of the cable as well as that of the surrounding GEM material to calculate the resistance to Earth.
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