Analysis of the Sensitivity of K-Type Molecular Sieve-Deposited MWNTs for the Detection of SF6 Decomposition Gases under Partial Discharge

Sensors

Xiaoxing Zhang¹  Xin Li¹  Chenchen Luo²  Xingchen Dong¹  Lei Zhou¹ 

[1] State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China; E-Mails:;Maintenance Company, State Grid Zhejiang Electric Power Company, Hangzhou 311232, China; E-Mail:

关键词: partial discharge;    SF₆ decomposition component;    multi-walled carbon nanotube;    K molecular sieve;    gas sensitivity;   

DOI  :  10.3390/s151128367

来源: mdpi

【 摘 要 】

Sulfur hexafluoride (SF₆) is widely utilized in gas-insulated switchgear (GIS). However, part of SF₆ decomposes into different components under partial discharge (PD) conditions. Previous research has shown that the gas responses of intrinsic and 4 Å-type molecular sieve-deposited multi-wall carbon nanotubes (MWNTs) to SOF₂ and SO₂F₂, two important decomposition components of SF₆, are not obvious. In this study, a K-type molecular sieve-deposited MWNTs sensor was developed. Its gas response characteristics and the influence of the mixture ratios of gases on the gas-sensing properties were studied. The results showed that, for sensors with gas mixture ratios of 5:1, 10:1, and 20:1, the resistance change rate increased by nearly 13.0% after SOF₂ adsorption, almost 10 times that of MWNTs sensors, while the sensors’ resistance change rate with a mixture ratio of 10:1 reached 17.3% after SO₂F₂ adsorption, nearly nine times that of intrinsic MWNT sensors. Besides, a good linear relationship was observed between concentration of decomposition components and the resistance change rate of sensors.

【 授权许可】

CC BY   
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