Abstract
An experimental and testing platform was established to comparative study the decomposition characteristic of SF 6 under different voltage waveform (negative direct current (DC) voltage, positive DC voltage, and alternating voltage), and investigate the influence of pressure and adsorbent. Content variation of typical products under different conditions and the influence mechanism were observed and analysed in detail. The results indicate that SF 6 decomposition characteristics are closely related to a voltage waveform, pressure, and adsorbent. Concentrations of by-products under AC voltage are higher than those under DC voltage and SF 6 decomposes more easily under positive voltage than negative voltage, which can be explained by different discharge energy and distribution characteristic of space charges. The values of typical products show an obvious downward trend with pressure due to falling discharge energy, volume of active region and dissociation rate of SF 6 . Concentrations of typical products including SOF 2 , SO 2 F 2 , and SO 2 decrease dramatically after adding adsorbents because of physical absorption and chemisorption.
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