access icon free Effects of voltage forms, pressure, and adsorbent on the SF6 decomposition characteristics under corona discharge

© The Institution of Engineering and Technology
Received 20/07/2019, Accepted 09/12/2019, Revised 30/10/2019, Published 03/01/2020

An experimental and testing platform was established to comparative study the decomposition characteristic of SF6 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 SF6 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 SF6 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 SF6. Concentrations of typical products including SOF2, SO2F2, and SO2 decrease dramatically after adding adsorbents because of physical absorption and chemisorption.

Inspec keywords: dielectric materials; discharges (electric); insulating materials; chemisorption; corona; materials properties; biodegradable materials

Other keywords: experimental testing platform; alternating voltage; pressure; insulation degradation; gaseous dielectric material; distribution characteristic; absorption; discharge energy; DC voltage; adsorbent; AC voltage; voltage waveform; chemisorption; SF6 decomposition characteristics; insulation defects; corona discharge

Subjects: Environmental issues; Gaseous insulation, breakdown and discharges; Engineering materials

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