Abstract
H2S and SO2 are important characteristic gases of partial discharge (PD) generated by latent insulated defects in gas insulated switchgear (GIS). The detection of H2S and SO2 is of great significance in the diagnosis and assessment of the operating status of GIS. In this paper, we perform experiments on the gas sensitivity of unmodified multi-walled carbon nanotubes (MWNTs) and those modified by atmospheric pressure dielectric barrier discharge (DBD) air plasma at different times (30, 60 and 120 s) for H2S and SO2, respectively. The results show that the sensitivity and response time of modified MWNTs to H2S are both improved, whereas the opposite effects are observed for SO2. The modified MWNTs have almost zero sensitivity to SO2. Thus, the MWNTs modified by atmospheric pressure DBD air plasma present good selectivity to H2S, and have great potential in H2S detection.
Highlights
Gas insulated switchgear (GIS) has been widely used in power systems due to its compact structure, small footprint and high reliability
Some latent insulation faults in GIS are inevitable in the progress of manufacturing, assembly and operation, resulting in different degrees of partial discharge (PD) which lead to the decomposition of sulfur hexafluoride (SF6) gas
We used four different kinds of multi-walled carbon nanotubes (MWNTs)-based gas sensors to detect H2S and SO2 whose concentrations were both
Summary
Gas insulated switchgear (GIS) has been widely used in power systems due to its compact structure, small footprint and high reliability. Some latent insulation faults in GIS are inevitable in the progress of manufacturing, assembly and operation, resulting in different degrees of partial discharge (PD) which lead to the decomposition of sulfur hexafluoride (SF6) gas. SOF2, SO2F2, SOF4, SO2, H2S, and HF are produced if there are trace amounts of air and water vapor present. These gases are close to Sensors 2012, 12 the degree and type of PD. H2S and SO2 are important characteristic gases of partial discharge produced by latent insulation defects in GIS [1,2]. The detection of H2S and SO2 has important significance in the diagnosis and assessment of the state of GIS equipment operations
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