Preparation of Standard Gas Reference Materials of Trace Amount of Characteristic Decomposition Components of SF6

Abstract

Preparing standard gas materials of trace amount of characteristic decomposition components of SF 6is the top priority in monitoring the SF 6insulated electrical equipment online. Making using of quantifying method, we prepared four kinds of standard gas reference material, which were named as CO2/SF6, CF4/SF6, SOF2/SF6, SO2F2/SF6, and they were applied for quantitative calibration in the four major kinds of decomposition components of SF6, that is CO2, CF4, SOF2 and SO2F2. The storage problems of the four trace amount of gas reference materials had been considered and solved while the short-term and long-term stability, pressure stability of the gas reference materials were taken into account as the test index. It had been showed that the standard uncertainties of the four kinds of gas reference material were all less than 0.2 %, and the consistency of material, long-term stability in 6 months and the uniformity of them all behaved well, which had met the state second-grade reference. As a consequence, the standard gas reference materials we made could be used in quantitative calibration of the characteristic decomposition components of SF6.