الفهرس 
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Abstract
The rubber and epoxy are polymeric materials widely-used as insulating materials for many reasons such as; economy, strength and ease fabrication to good tolerance. As a result of the development which has taken place recently; these materials can be produced with various designs and shapes for outdoor applications with suitable electrical and mechanical properties according to their intended purpose.
Composite material has electrical properties such as dielectric strength and electric resistivity which are measured by different tests and compared with different composite materials according to the added filler. The (Micro- Nano- hybrid) filler is inserted in manufacturing the composite material to improve its
electrical and mechanical properties.
Epoxy composites are one of the polymeric composite
insulators which are used in outdoor insulation. In order to study the electrical behavior of epoxy composites as outdoor applications insulators for overhead transmission lines at different conditions, inorganic fillers such as titanium dioxide and silica with different sizes are inserted into the epoxy to modify its electrical and physical properties in addition to maximize surface flashover voltage and decrease tracking phenomena at dry and contaminated weather conditions. Surface flashover voltage for composite insulators is calculated using neural-network based on mathematical model at any weather condition.
The objective of this research is to study electrical
properties of epoxy composites for overhead transmission lines under contaminated weather conditions. The composites include inorganic filler of different types, sizes and concentrations. It is used as insulators. This is aimed at selecting the suitable polymer composite insulator which achieves the maximum surface
flashover voltage.
Finally the main salient points of the chosen polymeric
insulator for this work have been summarized and presented.