A simple surge arrester model extracted from experimental results

This paper presents a simplified ZnO surge arrester model extracted from experimental results. The parameters in the proposed model are estimated from the experimental results. The current generation circuit is included in the algorithm for the parameter estimation. The generation circuit is composed of a charging capacitor and an associated inductor for producing the standard lightning impulse current waveform of 8/20 μs. The experiment on injection of 8/20 μs waveform current to the surge arrester was carried out in a real HV laboratory. Injected currents and residual voltages calculated by the IEEE, modified IEEE, and proposed model, and from experiment are compared in this paper. From the compared results, the proposed model shows better accuracy than the other models. It is simpler, faster in calculation, and has more accuracy than the other models. From this achievement, the accurate arrester model can be readily applied in a circuit simulator in insulation coordination design.