For reliable
protection of overhead transmission lines from direct lighting stroke using
ground wires, the protection angle ‘a’ between the vertical line through the
ground wire axis and the line passing from the ground wire axis to the outer
most line conductors should be ________.
400-500
200-300
100-150
500-600
200-300
Ground wire is used to protect against direct lighting stroke in the over head power transmission line.
There by providing protection to the phase wire.
(The angle
between them is called shielding and the angle between them is 200
G = (Earth wire)
0 = Sheilding wire
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