الفهرس Only 14 pages are availabe for public view
 |  | from | 109 |  |  |
| | | from | 109 | | |
Abstract
Inorganic material such as Porcelain and Glass have been used as H.V insulators for prolonged period of time, but, the main obstacles that has been encountered using these materials are its high cost, susceptibility to erosion; therefore, efforts were dedicated to develop alternative materials such as polymers.
Ever since their introduction in the early 1970’s, polymers insulators have been increasingly accepted by utilities as a suitable replacements for Porcelain & Glass insulators. Recently, rubbers are widely be used as out door insulators, such as Silicon rubber (SIR), Ethylene Propylene rubber (EPR) and Ethylene Propylene Diene Monomer (EPDM).
Once the polymer is manufactured, it needs to be compounded into a suitable material in order to be used as an H.V insulator. Polymer compounding is the science of mixing the polymers with other chemicals to produce a polymer compound of which has specific properties for an application such as electrical insulators.
Vulcanizing agents are ingredients used to cause chemical reaction resulting in the cross-linking in elastomer molecules. Through chemical cross-linking an elastomeric compound is converted from soft, tacky material to stiff, temperature stable material. There are many types of vulcanizing agents that have an effect on the physical properties of the polymers, thus, enhancing their service capabilities as H.V insulators.
Polymer formulated to provide performance characteristics better than those of Porcelain. Because of the wide deviation in the physical properties of Porcelain and polymers, comparison between the two materials should be focused on specific functional parameters in order to obtain conclusive results; however, liking is usually given to polymers over porcelain based on short term electrical characteristics of complete insulators.
There for the present work studied the effect of vulcanization temperatures such as room temperature vulcanized and high temperature vulcanized on the Electrical Performance of EPDM rubber as H.V insulators. Circular EPDM composite samples have been examined experimentally in atmospheric air and after immersion in [water ,NaCl solution ].
The ac ( 50Hz ) dielectric strength has been measured for different sets of samples under different testing condition.
Inorganic fillers such as kaolin ,feldspar and Quartz are incorporated into EPDM to improve the electrical ,mechanical, thermal and physical properties in addition to maximize dielectric strength and decreasing the erosion phenomena .
The effect of adding inorganic fillers used on the electrical performance of EPDM have been studied .The conclusion and the suggestion have been taken according to this studied .