Lightning-induced voltages on multiconductor overhead lines

The effects of other conductors in a multiconductor overhead line on the voltages induced on a conductor by a nearby lightning strike are analyzed on the basis of previous studies on long single-conductor overhead lines. It is shown that the presence of other conductors affects the induced voltage of a conductor, particularly for vertically configured lines; however, the amount is less than that originally predicted. Ground wires reduce the magnitude of the induced voltages, thus acting as partial shields. The amount that the ground wires reduce the induced voltages on the conductors is dependent on the position of the ground wires in relation to the ungrounded conductors