Abstract
This paper shows evaluation of thermal degradation characteristics of EP-rubber used for O-rings in the Gas Insulated Switch Gear (GIS). The gas seal performance of GIS is an important issue for deciding the instrument duration and maintenance period. Thermal aging tests in N_2 gas and the atmospheric conditions were conducted to evaluate the stiffness of the EP-rubber. Moreover, compressive stress-relaxation tests of EP-rubber O-rings were conducted under 100℃, 120℃ and 150℃ to evaluate stress reduction. As a result, the degradation of EP-rubbers does not progress too much in inert gas. And we propose a new evaluation formula for rate of stiffness rise and stress relaxation rate of EP-rubbers by applying Arrhenius equation. As regards duration of the gas seal performance, evaluation of stress which is indicated by compressive stress-relaxation is enormously of importance as well as stiffness transition by thermal degradation.
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