The main problem of this model is how to identify
its parameters. The W.G.3.4.11 suggests an iterative
procedure where corrections on different elements are
necessary until a satisfactory behavior is obtained.
The starting values can be obtained through formulas
that take into account both the electrical data (residual
voltages), and the physical parameters (overall height,
block diameter, columns number)[3].
The inductance L1 and the resistance R1 of the
model comprise the filter between the two non-linear
resistances. The formulas for these two parameters
are