A Flashover Model Using a Nonlinear Inductance

Abstract

A simple arcing horn flashover model for a lightning surge analysis is developed based on a theory of leader development. Conventionally, an arcing horn impedance is modeled by linear inductors and switches. However, the inductances and the timing of the switching operation depend on circuit conditions, and the voltage across the arcing horn. In this paper, the characteristic of an equivalent inductance to an arcing horn flashover is investigated and is approximated by a simple equation which is a function of arcing horn current. The proposed model consists of nonlinear and linear inductances and two switches. The switches are controlled by the arcing horn voltage and current. The switching operation is easily realized by TACS subprogram of the EMTP. The proposed model is more general than conventional models and its accuracy is satisfactory enough.
Furthermore, experimental results are compared with the results using proposed model, and confirmed the accuracy of the model.