INVESTIGATIONS ON AGEING OF HOLLOW MICROSPHERE FILLED SILICONE GEL UNDER ELECTRIC FIELD STRESS

The increasing requirements in MV- and HV- technologies necessitate new and improved insulation materials. Silicone gel filled with hollow microsphere (HMS) is such a novel isolation material. The gas-filled polymeric microspheres were incorporated into a silicone gel matrix. The structure of the resulting material is similar to foam. To use HMS filled silicone gels in medium and high voltage components it is necessary to have a comprehensive and a consolidated knowledge of their electrical properties. Especially the ageing performance during electrical stress is important. In this investigation an economically test has been executed to get knowledge about the electrical ageing performance of silicone gel filled with HMS. To investigate the ageing performance of these materials a life…