الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Electric cables play a crucial role in transmission and distribution systems.
Polyvinyl chloride (PVC) is extensively used in cable insulation. In this work, PVC samples filled with nanosized zinc oxide (ZnO) and magnesium oxide (MgO)
particles are prepared. Also, sandwich-structured PVC nanocomposites are
prepared. The effect of different layer arrangement on dielectric properties of
sandwich-structured PVC nanocomposites (NC) is evaluated. The evaluation of
sandwich-structure PVC NC is carried out considering different layer arrangement.
Also, the effect of external electric field during sample preparation on the dielectric properties of PVC nanocomposites is evaluated. Accordingly, the samples are subjected to horizontal and vertical external electric fields during the preparation
process. The evaluation is carried out considering different nanoparticle
concentration levels. The studied concentration levels are 0.5, 1, 3 and 5 wt% for both adopted nanofiller types. Breakdown strength of the prepared NC samples is measured according to American Society for Testing and Materials (ASTM) standard. Also, relative permittivity and dielectric loss of the prepared NC samples
are measured. The evaluation of PVC NC is carried out considering horizontal and vertical electric fields. The obtained results show significant effects on the dielectric properties of the tested samples. Hence, the results show that sandwich structured method and external electric field decreases relative permittivity and dielectric loss; however, it increases the breakdown strength of PVC NC. Applied
horizontal electric field during sample preparation gives more improvement in
dielectric properties of PVC NC compared to vertical electric field. Finally, the
interpretation of the obtained results is highlighted and discussed.