In this model, L0 represents the inductance associated with magnetic field near the arrester. The resistor R0 is used to avoid numerical instabilities and the capacitance C represents the terminal-to-terminal capacitance of the arrester. These parameters are estimated by (2).
where: d is the estimated height of the arrester in meters; n is the number of parallel columns of metal oxide in the arrester. After the evaluation of the parameters is necessary to adjust the characteristics A0 and A1, and the parameter L1 by trial and error procedure, as described in [2], to obtain a good match to the discharge voltages for switching and 8/20 μs discharge currents, respectively.