الفهرس 
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Abstract
Power cables operate at high temperatures over long periods of time, and the electrical behavior of silicone rubber prefabricated cable accessories would change as a result of thermal aging. Accordingly, the effect of thermal ageing on the behavior of electrical treeing in silicone rubber nanocomposites is evaluated in this thesis. The evaluation is carried out considering different nanofiller types. The adopted nanofillers are SiO2 and ZrO2. The silicone rubber nanocomposites samples are prepared considering different nanofiller types with different nanofiller concentration levels. Three different concentration levels of each nanofiller types are evaluated; 0.1, 0.5 and 1 %wt. The effect of thermal aging is investigated at aging temperatures of 120 oC and 180 oC considering aging duration time of 28 days. The electrical treeing test is
carried out by applying fixed AC voltage with a frequency of 50 Hz on the prepared samples considering needle-plane electrode configuration. The
electrical tree test is preformed after each week and the evaluation is based on
the electrical tree length as well as the tree shape. The obtained results are
validated using FEM software. Finally, the evaluation of dielectric spectroscopy of silicone rubber nanocomposites is carried out considering aging temperature of 180 oC.