Study on the Process of Predischarge in Rocket-triggered Lightning by Streak Photograph

Abstract

The experiment of triggered lightning by rocket has been carried out for the real power transmission line tower and the real lightning rod. The predischarge phenomena including leader propagation to the test objects were studied with the streak photograph by moving film camera and with the observation of the discharge current wave and the electric field change at ground. The stepped leader of negative polarity was observed to propagate downward to the grounded object, then the upward leader of positive polarity propagated from the rocket to the cloud contineously. The protection effect of lightning rod was also studied by the streak photograph for the triggered lightning test to the real lightning rod.