Experimental investigation and modeling of corona characteristics under lightning impulses

An experimental study is conducted on the corona characteristics under lightning impulses. The charge-voltage characteristics, i. e. the Q-U curves, are measured in a corona cage. The impulse waveshapes are varied to investigate their influence on the Q-U curves. Meanwhile, a corona model is proposed to compute the Q-U curves. The ionized zone is simplified as a cylindrosymmetric geometry and a one-dimensional subdivision is made in the radial direction. The Q-U curves can be given by performing an efficient computational procedure. The computed results are compared with the measured ones to check the validity of the model.