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Partial discharge (PD) with different energy always occurs before a serious breakdown in sulfur hexafluoride (SF6) insulating equipment. The high electromagnetic energy of PD can cause the insulation gas SF6to decompose into various components. Component types and their formation rate are directly related with insulation fault severity. Hence, PD energy can be evaluated based on the characteristics of SF6decomposition, which could be further used to diagnose insulation status. This paper focuses on the SF6decomposition mechanism under PD, establishes the feature parameter to describe PD energy, and clarifies the feature parameter's physical significance. In addition, this paper defines the effective energy characteristic ratio ERRMSand analyzes the relationship between ERRMSand PD energy. Finally, this paper discusses the influence regularity of trace H2O and O2on ERRMS.
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Tang et al. (2014) studied this question.
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