Modelling of the leader current with an equivalent electrical network

Abstract

The purpose of this paper is to present an electrical model of the leader current, which is relevant to describe the current resulting from an oscillating impulse voltage. The model allows one to evaluate the leader current, the electrical charge and the potential profile along the leader channel. The physical parameters of the leader are described by making use of an equivalent electrical network. By integrating these parameters in a test circuit, we are able to deduce the current and the electrical charge at any point in the air gap. Our results are then compared with the experimental ones obtained for discharges in large air gaps that are produced experimentally. The current and electrical charge characteristics given by the model are in good agreement with the experimental ones.