Abstract

For twenty years the general condition of oilfilled electrical equipment, particularly transformers, has been monitored by determining dissol ved gases in oil, using gas chl'omatography. More specific additional information can now be obtained by quantifying heavier molecules, using liquid chromatography. The chromatographic techniques which are being used are described and successful applications are presented. These include methods for assessing the state of paper insulation in transformers, studying other solid polymeric materials in transformers and cables, characterisation of insulating oils and determination of their additive content.

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