A Study of Condition Assessment Method of Gas-Insulated Switchgear based on the Adsorbent (Part I)

—Adsorbent Aqueous Solution Analysis Method—

Abstract

We have proposed the condition assessment method of the GIS based on the gas analysis. This method utilizes the accumulation of SF₆ decomposition gas which is generated by the partial discharge or overheating and has a advantage that does not receive the influence of electrical noise. However, the decomposition gas is adsorbed by the adsorbent that was installed at the equipment as soon as it is generated. Therefore, an efficient separation and sensitive analysis method of the decomposition gas from the adsorbent are necessary.
In this report, we proposed the simple separation and sensitive analysis method of decomposition gas. The decomposition gas in the adsorbent was separated as the aqueous solution by immersing the adsorbent in the purified water, and adsorbent aqueous solution was analyzed by water quality meter and ion chromatograph. As the result of water quality meter analysis, the characteristics of aqueous solution including the decomposition gas were greatly different from the one that doesn't contain decomposition gas. As the result of ion chromatograph analysis, the ingredient of the decomposition gas was able to be detected directly from aqueous solution. Therefore, it was shown that these proposed method are very useful for condition assessment method of GIS.