Lightning induced voltages on overhead conductors at different heights

The induced voltages due to a nearby lightning on an overhead conductor at different heights from the ground have been computed. The influence of finite ground conductivity on the induced voltages are analysed. It is observed that the finite ground conductivity influences the induced voltage on the conductors at lower heights (/spl les/ 20 m) significantly. The influence of finite ground conductivity on the induced voltage for conductors at very large height (/spl ges/ 100 m) is found to be insignificant.