PPS electrical properties for power transformers

In order to find a material that can be used as wrapped insulating film in the power transformer industry, we have tested polyphenylene sulfone which is film characterized by a high thermal resistance, a high chemical resistance and an outstanding mechanical strength. The thermal degradation study is of major importance in this application, so thermal aging test in the presence of silicone oil at 160/spl deg/C was carried out in reactor. Dielectric breakdown, partial discharges, conductivity, permittivity and dielectric loss measurement were studied in the investigation.