Research on the Degradation of Insulating Material by Feeble Discharge in SF₆ Gas due to the Quantitative Measurement of Discharge Light

Abstract

To prevent severe faults in GIS, studies on the relation between UV irradiation and degradation of insulating material are presented. By using the measurement system of discharge-light-emission, quantitative measurement of the discharge light is carried out, and the absolute emission power of the discharge is obtained. On the one hand, the degradation of insulating material is evaluated employing sample materials which are irradiated by a UV-laser. The result is obtained that the volume or the surface resistance decreases as the amount of irradiation increases.