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

1
State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China
2
School of Electrical Engineering, Wuhan University, Wuhan 430072, China
3
Maintenance Company, State Grid Zhejiang Electric Power Company, Hangzhou 311232, China
*
Author to whom correspondence should be addressed.
Academic Editor: Michael Tiemann
Sensors 2015, 15(11), 28367-28384; https://doi.org/10.3390/s151128367
Received: 4 August 2015 / Revised: 4 November 2015 / Accepted: 5 November 2015 / Published: 11 November 2015
(This article belongs to the Section Physical Sensors)
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. View Full-Text
Keywords: partial discharge; SF6 decomposition component; multi-walled carbon nanotube; K molecular sieve; gas sensitivity partial discharge; SF6 decomposition component; multi-walled carbon nanotube; K molecular sieve; gas sensitivity
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Zhang, X.; Li, X.; Luo, C.; Dong, X.; Zhou, L. Analysis of the Sensitivity of K-Type Molecular Sieve-Deposited MWNTs for the Detection of SF6 Decomposition Gases under Partial Discharge. Sensors 2015, 15, 28367-28384.

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