Investigation of formation process of gaseous decomposition products of insulation in high-voltage impulse capacitors during life tests

In this paper an attempt has been made to find a correlation between the characteristics of gaseous decomposition products of insulation dissolved in insulating fluid and residual life of high-voltage impulse capacitors (HVIC) according to the results of life tests. It is shown that the most informative parameter, characterizing insulation condition, is the ratio of concentration of CO/sub 2//CO. A scheme is proposed of HVIC diagnostics in service according to results of the chromatographic analysis of gases dissolved in oil.