Influences of different absorbents on the detection of SF6 gas decomposition products

After the setup of detection system based on gas chromatography, typical gas decomposition products of corona and spark discharge in needle-to-plate defect model were detected. Modeling the practical regulations, absorbents with one tenth the quality of filled SF₆ gas were added in the gas cell. Focusing on the concentrations of SO₂F₂ and SO₂, gas decomposition on the sole existence of silica gel and four types of molecular sieve- KDHF-03, F-03, 4A and 5A were compared. Moreover, influences of absorbents with different numbers of use on detection results were analyzed. It is clear that influences of absorbents added in practical SF₆ insulated apparatus on gas chromatography detection are not fatal. As for absorbent performance evaluation, comparing with molecular sieve, silica gel is not recommended. Among the molecular sieve investigated, while 4A is obviously worse than the other three, with lower SO₂ concentration but higher SO₂F₂ concentration than the compare group. KDHF-03 is best with comprehensively lower concentrations of gas decomposition products.