Influence of microwater on the decomposition of SF6/N2 gas mixture insulating media in overheating faults
Currently, China is using the SF6/N2 gas mixture to gradually replace SF6 in GIS and other equipment. However, gas-insulated equipment will inevitably have local overheating faults. The SF6/N2 gas mixture will decompose to some extent at high temperatures. Impurities such as moisture in the equipmen...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2024-01-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/5.0188950 |
| _version_ | 1827363160444633088 |
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| author | Haoxin Chen Xiaosong Zeng Yanfeng Xiao Haotian Li Qiang Yao Fuping Zeng |
| author_facet | Haoxin Chen Xiaosong Zeng Yanfeng Xiao Haotian Li Qiang Yao Fuping Zeng |
| author_sort | Haoxin Chen |
| collection | DOAJ |
| description | Currently, China is using the SF6/N2 gas mixture to gradually replace SF6 in GIS and other equipment. However, gas-insulated equipment will inevitably have local overheating faults. The SF6/N2 gas mixture will decompose to some extent at high temperatures. Impurities such as moisture in the equipment can affect this decomposition process. At present, there are fewer studies on the moisture content of the superheated decomposition of the SF6/N2 gas mixture. Therefore, this paper carries out the SF6/N2 mixed gas superheat decomposition experiment on the constructed superheat decomposition simulation experiment platform. By changing the content of trace water, the influence of trace water on the decomposition of the SF6/N2 mixed gas insulation medium with superheat failure was initially investigated. It is found that trace H2O will promote the generation of SF6 characteristic decomposition products, especially for the generation of SO2F2. The generation of SO2 in the product is the largest, and its generation process needs the full participation of H2O. In addition, the addition of trace water will also improve the yield of nitrogen-containing products NO and NO2, and under the experimental conditions of this paper, by adding the microwater, the yield reaches 100–300 µl/l. The reaction mechanism of H2O decomposition and combining with N atoms to generate NO and NO2 at high temperatures was analyzed in this paper. The thermodynamic properties of the main reaction paths and the equilibrium constants were calculated based on the density functional theory, which provided theoretical references for the further study of the mechanism of SF6/N2 superheated decomposition. |
| first_indexed | 2024-03-08T07:44:04Z |
| format | Article |
| id | doaj.art-71e89c7dc79e456997e4fe40233d1406 |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-03-08T07:44:04Z |
| publishDate | 2024-01-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-71e89c7dc79e456997e4fe40233d14062024-02-02T16:46:06ZengAIP Publishing LLCAIP Advances2158-32262024-01-01141015154015154-810.1063/5.0188950Influence of microwater on the decomposition of SF6/N2 gas mixture insulating media in overheating faultsHaoxin Chen0Xiaosong Zeng1Yanfeng Xiao2Haotian Li3Qiang Yao4Fuping Zeng5College of Electrical Engineering and New Energy, Yichang 443002, ChinaMian County Electric Power Supply Branch Company, State Grid Shaanxi Electric Power Company, Shannxi, Hanzhong 724200, ChinaScience and Technology Research Center, China Yangtze Power Company, Yichang 443002, ChinaState Key Laboratory of Power Grid Environmental Protection, School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, ChinaState Grid Chongqing Electric Power Company Electric Power Research Institute, Chongqing 401123, ChinaState Key Laboratory of Power Grid Environmental Protection, School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, ChinaCurrently, China is using the SF6/N2 gas mixture to gradually replace SF6 in GIS and other equipment. However, gas-insulated equipment will inevitably have local overheating faults. The SF6/N2 gas mixture will decompose to some extent at high temperatures. Impurities such as moisture in the equipment can affect this decomposition process. At present, there are fewer studies on the moisture content of the superheated decomposition of the SF6/N2 gas mixture. Therefore, this paper carries out the SF6/N2 mixed gas superheat decomposition experiment on the constructed superheat decomposition simulation experiment platform. By changing the content of trace water, the influence of trace water on the decomposition of the SF6/N2 mixed gas insulation medium with superheat failure was initially investigated. It is found that trace H2O will promote the generation of SF6 characteristic decomposition products, especially for the generation of SO2F2. The generation of SO2 in the product is the largest, and its generation process needs the full participation of H2O. In addition, the addition of trace water will also improve the yield of nitrogen-containing products NO and NO2, and under the experimental conditions of this paper, by adding the microwater, the yield reaches 100–300 µl/l. The reaction mechanism of H2O decomposition and combining with N atoms to generate NO and NO2 at high temperatures was analyzed in this paper. The thermodynamic properties of the main reaction paths and the equilibrium constants were calculated based on the density functional theory, which provided theoretical references for the further study of the mechanism of SF6/N2 superheated decomposition.http://dx.doi.org/10.1063/5.0188950 |
| spellingShingle | Haoxin Chen Xiaosong Zeng Yanfeng Xiao Haotian Li Qiang Yao Fuping Zeng Influence of microwater on the decomposition of SF6/N2 gas mixture insulating media in overheating faults AIP Advances |
| title | Influence of microwater on the decomposition of SF6/N2 gas mixture insulating media in overheating faults |
| title_full | Influence of microwater on the decomposition of SF6/N2 gas mixture insulating media in overheating faults |
| title_fullStr | Influence of microwater on the decomposition of SF6/N2 gas mixture insulating media in overheating faults |
| title_full_unstemmed | Influence of microwater on the decomposition of SF6/N2 gas mixture insulating media in overheating faults |
| title_short | Influence of microwater on the decomposition of SF6/N2 gas mixture insulating media in overheating faults |
| title_sort | influence of microwater on the decomposition of sf6 n2 gas mixture insulating media in overheating faults |
| url | http://dx.doi.org/10.1063/5.0188950 |
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