Analysis of PD-generated SF6 decomposition gases adsorbed on carbon nanotubes

Weidong Ding, Ryota Hayashi, Kohei Ochi, Junya Suehiro, Kiminobu Imasaka, Masanori Hara, Noriaki Sano, Eiichi Nagao, Tadao Minagawa

Research output: Contribution to journalArticle

72 Citations (Scopus)

Abstract

Chemical byproducts analysis has been recognized as a powerful diagnosis method for SF6 gas-insulated switchgear (GIS). The authors have previously demonstrated that a carbon nanotube (CNT) gas sensor could detect partial discharge (PD) generated in SF6 gas. However, PD-generated decomposition gas species, which were responsible for the CNT gas sensor response, have not been identified yet. In this paper, two kinds of experiments were conducted in order to identify the responsible decomposition gas species. At first, the decomposition gas molecules adsorbed on CNTs were analyzed by Fourier transformation infrared (FTIR) spectroscopy. FTIR absorbance was observed around 735 cm-1 after CNTs were exposed to PD generated in SF6. In the second experiment, the CNT gas sensor responses to typical SF6 decomposition products (HF and SF4) were examined. The CNT gas sensor responded to these gases in the same way as to PD generated in SF6. SF4 response was larger than HF response. Based on these results, SF4 and SOF2 emerged as candidates for the responsible decomposition gases. Electrochemical interactions between adsorbed gas molecules and CNT were discussed based on theoretical predictions of molecular orbital calculations. The calculation results suggested that both of SOF2 and SF4 could increase the CNT gas sensor conductance.

Original languageEnglish
Pages (from-to)1200-1207
Number of pages8
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Volume13
Issue number6
DOIs
Publication statusPublished - Dec 1 2006

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Partial discharges
Carbon nanotubes
Decomposition
Chemical sensors
Gases
Orbital calculations
Molecules
Electric switchgear
Molecular orbitals
Byproducts
Infrared spectroscopy
Experiments
Infrared radiation

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Cite this

Analysis of PD-generated SF6 decomposition gases adsorbed on carbon nanotubes. / Ding, Weidong; Hayashi, Ryota; Ochi, Kohei; Suehiro, Junya; Imasaka, Kiminobu; Hara, Masanori; Sano, Noriaki; Nagao, Eiichi; Minagawa, Tadao.

In: IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 13, No. 6, 01.12.2006, p. 1200-1207.

Research output: Contribution to journalArticle

Ding, W, Hayashi, R, Ochi, K, Suehiro, J, Imasaka, K, Hara, M, Sano, N, Nagao, E & Minagawa, T 2006, 'Analysis of PD-generated SF6 decomposition gases adsorbed on carbon nanotubes', IEEE Transactions on Dielectrics and Electrical Insulation, vol. 13, no. 6, pp. 1200-1207. https://doi.org/10.1109/TDEI.2006.258191
Ding, Weidong ; Hayashi, Ryota ; Ochi, Kohei ; Suehiro, Junya ; Imasaka, Kiminobu ; Hara, Masanori ; Sano, Noriaki ; Nagao, Eiichi ; Minagawa, Tadao. / Analysis of PD-generated SF6 decomposition gases adsorbed on carbon nanotubes. In: IEEE Transactions on Dielectrics and Electrical Insulation. 2006 ; Vol. 13, No. 6. pp. 1200-1207.
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