Abstract
This paper, an evaluation of thermal degradation characteristics of EP-rubber used for O-rings in the Gas Insulated Switch Gear (GIS) is described. The gas seal performance of GIS is an important issue for deciding the instrument duration and maintenance period. In order to establish the accurate evaluation methods for thermal degradation of GIS O-rings, biaxial tensile test was conducted to obtain material parameter of EP-rubber. Moreover, some DSC analyses were carried out to validate its applicability to the aging index of EP-rubber.
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