Abstract：In order to reduce the influence of adsorbents on the chemical diagnostic method used for the insulation status estimate of solid organic dielectric in gas insulated switchgear (GIS), creeping discharge model was set up on a small apparatus, to study the variation of characteristic gases in different conditions, including adding five different kinds of adsorbents (activated alumina, KDHF-03, etc) separately, The results show that the adsorption rate by different adsorbents on the carbon-containing gases is obviously smaller than that of the sulfur-containing gases. In addition to the adsorption rate on COS is not more than 40%, and the other three kinds of carbon-containing gases (CF4, CS2 and CO) are not affected by adsorbents or are weakly affected; and the influence of adsorbents can be neglected to diagnose insulation defects related to organic dielectric, according to the growth of characteristic gas CF4 in GIS. In the presence of adsorbent, CS2 can also be applied to judge whether the discharge is related to solid organic dielectric. The generation of COS indicates that the discharge level on the organic dielectric deepens, whereas the sensitivity of COS reflecting on creeping discharge level is decreased to some extent because of the influence of adsorbents. C(COS + CS2)/C(SO2F2), as a new diagnostic characteristic is proposed, shows a positive correlation with the degree of discharge, which can effectively reduce the interference of adsorbents to determine the seriousness of the discharge defects involving solid organic dielectric in GIS.
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2018, Vol. 33 
