kmh1
Electrical
- Sep 12, 2003
- 47
I am attempting to determine the actual 115 kV ground fault current at an industrial substation some 2.5 miles from the main utility 230/115kV transformer station. The fault current has been provided by the utility at the transformer station and the tap line is a wood pole line with two 5/16" steel overhead ground wires. I have a handle on the station ground resistance and am trying to calculate the current division via the overhead ground wires but I can't find any electrical characteristic data for steel wire other than the resistance is somewhere around 7 ohms per mile. Does any one have impedance and GMR information for steel wire?