Electrical treeing in EPR at room and cryogenic temperatures and its fractal characteristics

摘要

1. Treeing performance of EPR at cryogenic temperature is much superior compared to that at room temperature, both with metal and semi-conducting needles. This is a very encouraging result from the point of view of application of EPR as cryogenic cable insulation.rn2. The difference in fractal behaviour at room and cryogenic temperatures appears to point towards a difference in growth dynamics. This may be attributed to difference in space-charge and partial discharge activities responsible for tree initiation and growth.