In this paper, the surge arrester conventional model was represented by a nonlinear resistor (model Type-92 from ATP). This model provides a true representation of the nonlinearity of the varistor through a piecewise-linear characteristic of current and voltage [1]. The nonlinear resistor is shown in Fig. 3.
In this model, the dynamic characteristic of the surge arrester is not taken into account. The voltage peak occurs in the same time of current peak, even for current waveforms which the peak is in the range of 8 μs and faster.