Influence regularity of trace O6 on SF6 decomposition characteristics and its mathematical amendment under partial discharge

In order to build a solid engineering application foundation when using decomposed characteristic components to identify the internal insulation faults of SF6 electrical equipment, this paper conducted serials of experiment about the influence of different trace O
₂
on SF
₆
decomposed components. The variation regularity of the accumulative concentration, relative formation rate, and ratio of the characteristic component (CF
₄
, CO
₂
, SO
₂
F
₂
, and SOF
₂
) with changing time was investigated. The dynamics theory of the chemical reaction was exploited to analyze the influence regularity of O
₂
on the characteristic components. A mathematical model about the influence of O
₂
on the characteristic ratio (C(CF
₄
)/C(CO
₂
), CCF
₄
+CO
₂
)/C(SOF
₂
+SO
₂
2F
₂
) and C(SO
₂
F
₂
)/C(SOF
₂
) ) was established. The results show that: the accumulative concentration and relative formation rate of CF
₄
, CO
₂
, SO
₂
F
₂
, and SOF
₂
changes with the content of different trace O
₂
, but each variation regularity is different. As a result, it leads to different variation regularity of characteristic ratios. Besides, power function can depict the influence regularity of trace O
₂
on the characteristic ratios and adjust the SF
₆
decomposition characteristics of different O
₂
content to a comparable standard, which can lay theoretical basis for diagnosing the insulation defects of the SF6 electrical equipment.