如某电站2号主变的色谱测定结果可看出：故障后主变油样中的气体，以H2和C2H2为主，其次是CH4和C2H4，与量放电即电弧放电故障产生的特征气体相符。但油中气体与瓦斯中的CO含量高，说明故障不涉及固体缘。
利用三比值法对其故障进行判断：C2H2/C2H4=2.4，CH4/H2=0.2，C2H4/C2H6=12.9，编码为102，其故障性质为量放电。CO2/CO=46.5比值大于10，说明故障涉及纤维素劣化。
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