Analysis of SF6 Decomposition Byproducts under Two kinds of PD Defects

Based on the SF₆ decomposition device, this article has constructed two typical physical models of insulation defects and then used gas chromatography (GC) instrument to analyze the decomposed components of SF₆ under the two kinds of partial discharge (PD) defects. Preliminary tests show that SOF₂ is the main product of SF₆ decomposition under both the two kinds of defects, the amount of SOF₂ increases significantly with the extension of discharge time and that the gas production rates of SOF₂ are apparently different under the two different kinds of defects.