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ABSTRACT
This paper presents a new mathematical model of impulse corona for the analysis of lightning transients on overhead transmission lines. The corona ionization zone is simulated equivalently in a symmetrical and cylindrical configuration, and the conductor under corona is placed at the axis of the cylinder. Charge, electric field and voltage drop are related macroscopically in the model. Multilayer space charges, their development and their displacement are also taken into account. The input variable is the applied voltage and the total charge is obtained through the computational procedure of the model. The model parameters may be determinted with several measured data under the traditional lightning waveshapes, then the model can produce q-v curves under the realistic lightning waveshapes. A reasonable agreement is shown between the results from the model and from the experiments.