Study on the influence rules of trace H2O on SF6 spark discharge decomposition characteristic components

Au Catalyst-Modified MoS2 Monolayer as a Highly Effective Adsorbent for SO2F2 Gas: A DFT Study

“…4,5 These decomposed products would subsequently react with traces of gaseous O 2 and H 2 O existing in SF 6 -insulated equipment and form various characteristic decomposition products, including SOF 2 , SO 2 F 2 , SO 2 , etc. 6,7 The running stability of gas-insulated equipment can be greatly affected by the decomposition products of SF 6 , which may ultimately lead to the breakdown of the power system. 8,9 To ensure the strong insulation of SF 6 -insulated equipment, one of the effective approaches is to maintain the purity of the filled gas, that is, removing the decomposition products of SF 6 online.…”

Decomposition Characteristics of SF6 under Flashover Discharge on the Epoxy Resin Surface

“…Based on the concentration variation of seven different characteristic gases above, it can be seen that SOF 2 and CF 4 had the highest concentration far beyond other gas byproducts, both of which can therefore represent the main decomposition component resulting from flashover discharge happening on the epoxy resin surface. Compared with the previous studies focusing on partial discharge in SF 6 insulation equipment [1,14,17,24,29], flashover discharge on the epoxy resin surface could cause a drastically elevation in the concentration of SOF 2 and CF 4 , but generated a relatively lower concentration for H 2 S. According to these two statistics’ data, a preliminary rule can be summarized as follows:cSOF2>2cCF4and(cSOF2+cCF4)>400cH2normalS among which, c represents concentration for the selected gases. That is to say, when concentration of SOF 2 reaches twice of that of CF 4 , and the sum concentration of both SOF 2 and CF 4 is much higher than that of H 2 S, a possible flashover discharge on the epoxy resin surface in SF 6 -infused electrical equipment occurs.…”

“…To better explain the concentration variation of SO 2 , the generation path of SO 2 is depicted in Equations (6)–(9) [29]. It can be seen that the production of SO 2 needs oxygen or water.…”

“…The generation of H 2 S requires active S atoms and free H atoms [14,28,29]. The S atom is not the main decomposition byproduct of SF 6 [26], and the rising concentration of SO 2 could also reduce the reaction between S atoms and free H atoms.…”

Comprehensive Evaluation and Application of GIS Insulation Condition Part 1: Selection and Optimization of Insulation Condition Comprehensive Evaluation Index Based on Multi-Source Information Fusion

“…With the extensive use of gas insulated equipment represented by GIS in Ultra/UHV transmission and transformation systems [1]- [3], ensuring the reliable operation of GIS equipment is crucial for the safe operation of complex and large power grids. According to the statistics of the State Grid in recent years [4], the total tripping times of the power transmission and transformation equipment of 330kV level and above from 2013 to 2015 are 34 (2013), 28 (2014), and 20 times (2015), of which the proportion of GIS equipment insulation faults are 17.6% (2013), 35.7% (2014), 45% (2015).…”