Influence of stressing on gaseous decomposition products in insulating liquids

This paper deals with investigations on the gaseous decomposition products of insulating liquids: mineral oil, ester liquid, and silicone liquid. The investigations point out that the gaseous products depend on the kind of decomposition; as for example PD stressing or thermal decomposition. The mixture of the dissolved and undissolved gases does not differ significantly for the liquids used in the experiments. However a classification of the kind of decomposition by means of gas chromatographic analyses is possible. Best results regarding the reliability can be achieved by the interpretation methods of Dornenburg (1977). This method can be used for both the interpretations of dissolved and undissolved gases of mineral oil and, for the interpretations of decomposition gases of ester liquid and silicone liquid as well.