Experimental analysis reveals defect-specific decomposition dynamics in sulfur hexafluoride and nitrogen gas mixtures, highlighting byproduct gases as linear indicators of electrical discharge.
The use of SF₆ / N₂ gas mixtures in gas-insulated equipment reduces the greenhouse effect of pure sulfur hexafluoride gas. In this paper, the partial discharge decomposition of SF₆ / N₂ gas mixtures under insulator air gap defects and free metal particle defects is investigated. The results show that the main decomposition products of SF₆ / N₂ gas mixture under insulator air gap defects and free metal particle defects are SO₂ ~F₂, SOF₂, SO₂, nitrogen dioxide, nitrogen trifluoride and carbon tetrafluoride in insulator air gap defects SO₂, NO₂ and NF <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> maintain a good linear relationship, and these decomposition products can well characterize the magnitude of discharge, and then characterize the equipment internal intensity of localized discharges. Under the free metal particle defects, the rms gas production rates of SOF <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> and SO₂ ~F₂ basically show a linear increase with the increase of discharge, and the rms gas production rates of NO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> and NF <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> basically show a saturated state.
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Bai et al. (2024) studied this question.
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