sheet earthing.xlsx

	A	B	C
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2	Earthing Design.
3	Assume Fault MVA at 11 KV side of the transformer is 150 MVA		Unit
4	Duration of fault (t) in sec	3	sec
5	Soil Resistivity (q)	53	ohm.mtr
6	Power of Transformer	150	MVA
7	High Voltage	11	KV
8	Fault Current	7873	A
9	Permissible Current density of an electrode (Id)	600.34	A/m^2
10	Total Area of Earth Electrode (Fault current/Id)	13.1145	m^2
11	Area of standard Earth Electrode for both side	1.2mx1.2x12 mm
12	Area of Earth Plate	2.88	m^2
13	Number of Earth Plate Required	4.553662939	Nos
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