Assessment of insulation resistance from recovery voltage data

Polarisation and conduction processes in dielectric systems can be identified by the time domain or the frequency domain measurements. If the system is a linear one, the results of the time domain measurements can be transformed into the frequency domain, and vice versa. Commonly, the time domain data of the absorption conductivity are transformed into the frequency domain data of the dielectric susceptibility or the complex permittivity. In practice, the relaxation processes are mainly evaluated by the frequency domain data. In the time domain, the absorption current measurements were preferred up to now. Recent methods are based on the recovery voltage measurements. In this paper we shall treat in detail the processing of recovery voltage data with aim at computing the insulation resistance of the measured objects.