Investigation of ageing phenomena on epoxy resin insulation materials

Different types of epoxy resin current and voltage transformers were tested in order to determine the insulation degradation caused by partial discharges and their ageing characteristics. The deterioration process was regularly controlled by measuring the amount of partial discharge, the capacity and loss angle. Dangerous degradation of insulation was detected. The dielectric strength of different types and different composition of epoxy resin components was determined. The evaluation of tests was carried out by using mathematical statistical methods.<
>