Accurate Determination of Gas Leakage for GIS Products Under Extremely Low Temperature
This paper analyzes the two key factors affecting gas leakage measurement of GIS products under extremely low temperature,i.e.,volume of irregular cover,and SF6 concentration in ppm.It outlines how to accurately measure the two factors,and to further accurately determine the annual SF6 leakage rate of GIS products from extremely low tempera-ture to-40℃.By tracking quantitative CH4 standard sample,the volume of the irregular product cover can be accurately calculated.By the method of indirect heating sample,the ppm concentration of SF6 can be accurately monitored for a long time at low temperature to-40℃.The reliability of the proposed method is verified by effective tests.
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