Abridgment of effects of lightning voltages on rotating machines and methods of protecting against them

Rotating machines directly connected to overhead lines are subject to damage from lightning surges. Many methods of protection against such damage are possible and several of them are discussed in this paper. Laboratory experiments have been made to show the normal distribution under various steepnesses of waves, and the improvement of unsatisfactory distributions by means of condensers or lightning arresters connected to various parts of the windings has been studied.