Overhead Earth Wires
Overhead Earth Wires
(OP)
Is there a formula which calculates the relative proportions of earth fault return current through:
1) an overhead earth wire strung on the same poles as the faulted line; and
2) the body of the earth.
I have seen results for item 1) which include one component of earth fault current in the earth wire flowing back towards the substation and a smaller component flowing outwards away from the substation.
1) an overhead earth wire strung on the same poles as the faulted line; and
2) the body of the earth.
I have seen results for item 1) which include one component of earth fault current in the earth wire flowing back towards the substation and a smaller component flowing outwards away from the substation.






RE: Overhead Earth Wires
Some of the current will also return in earth wires not on the same poles as the faulted line, such as outgoing distribution feeders.