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为了提高化学诊断法用于GIS内盆式绝缘子等环氧树脂固体介质绝缘状态判断的准确性,在小型模拟平台上设置沿面放电及相关验证试验,研究了典型放电缺陷下SF6分解产物的变化规律.试验发现COS是一种重要的表征GIS内涉及环氧树脂固体介质绝缘放电的特征气体,且COS产生所需的放电程度强于CS2;用B3P86/6-31 G(d,p)量子化学计算方法对COS产生机理进行了理论计算研究,得出了环氧树脂固体介质放电条件下COS的生成机理和能量条件,固体绝缘放电时由盆式绝缘子等环氧树脂介质表面被炭化提供碳源,通过中间体HCS与O2、CS2马OH两个主要反应途径生成COS.试验与理论计算结果表明:CS2在判断放电是否涉及环氧树脂固体绝缘上具有很高灵敏度,CS2出现表示环氧树脂绝缘已出现放电;COS产生标志着环氧树脂介质放电程度严重,应缩短分解产物检测周期,加强对相关GIS气室的绝缘监测.“,”To improve the accuracy of chemical diagnosis method used for estimating the insulation conditions of basin insulators and other epoxy resins solid dielectric in GIS,creeping discharge and related verification tests are set up to study the evolving law of SF6 decomposition products under typical discharge defects on a small apparatus.It is found that COS,as an important characteristic gas related to epoxy resins discharge,is produced under stronger discharge than CS2.B3P86/6-31G(d,p),a method of calculation based on quantum chemistry,is adopted to explore the generating mechanism and energy conditions of COS when partial discharges occur on the solid dielectric in GIS.Carbon which is a component of COS derives from basin insulators and other epoxy resin solid dielectric,and the reactions of intermediate HCS and O2 as well as CS2 and OH are two main pathways to generate COS.Experiments and theoretical calculations show that decomposed gas CS2 has a high sensitivity in judging whether the discharge is related to the epoxy resin solid dielectric,CS2 can be applied to diagnose faults related to creeping discharge on the epoxy resin.The generation of COS indicates that the discharge level on the epoxy spacer deepens,thus the decomposition products testing period should be shortened,and it is important to strengthen insulation monitoring of relevant GIS chamber.