INVESTIGATION OF THE RELATIONSHIP BETWEEN THE RETURN VOLTAGE AND POLARIZATION SPECTRUM OF INSULATIONS

Abstract

The step-by-step method has been used to calculate the value and determine the shape of the return voltage after a longer charging-up the insulation with a DC voltage, followed by a temporary short circuit [1]. In this paper is given a computer simulation method to investigate the long time-constant range of the polarization spectrum. This range can be investigated by successive calculation of the value of polarizability (polarization intensity), or the initial slope of the return voltage curve obtained at different ratios between the charging and the discharging times. Also the simulation method is used for the investigation of the polarization spectrum obtained from the return voltage measurements. Finally a comparison has been done between the calculated and experimental results.