Title :
The sensitive characteristics study of SF6 decomposed gases using a graphene sensor
Author :
Yu Lei ; Xiaoxing Zhang ; Ju Tang
Author_Institution :
State Key Lab. of Power Equip. & Syst. Security & New Technol., Chongqing Univ., Chongqing, China
Abstract :
SF6 filled in gas insulated switchgear (GIS) equipment may decompose in consequence of partial discharge (PD), which is induced by the internal inevitable defects in GIS. Analyzing the SF6 decomposed components is a good way to diagnose and assess the operating state in GIS. Basically, the various concentration detections of these components, resulted from SF6 interacting with the micro-water and micro-oxygen which are contained in GIS, are significant to judge the insulation level of SF6 gas. Chemical gas sensor is an effective way to detect PD. Here in this work, reduced graphene oxide (rGO), a new functional two-dimensional material with a capability of gas sensing is first utilized to detect H2S, one of SF6 decomposed gases as well as the important characteristic products under PD according to the existing research achievements. The preparation and test method of rGO sensor are both explained in detail in this paper. Real-time monitoring of relative resistance change through the rGO device is used to confirm the response to SF6 decomposed gases. Surface morphology is characterized by scanning electron microscopy and Raman spectrum is introduced to estimate the thickness of rGO films. A series of experiments are conducted on the designed experimental system at room temperature in order to approach the real GIS operation condition. Our experimental results demonstrate that rGO layers deposition on epoxy substrate have great potential for SF6 decomposed components detection. Resistance change rate of H2S (100 uL/L) reaches 15.78%. Besides, this study discusses the recovery properties, which indicate that the rGO gas sensor is with good repeatability and stability. This study attempts to introduce another new material for SF6 decomposed components detection.
Keywords :
Raman spectra; SF6 insulation; gas insulated switchgear; gas sensors; graphene; hydrogen compounds; partial discharges; scanning electron microscopy; surface morphology; GIS operation condition; H2S; PD; Raman spectrum; SEM; SF6; characteristic products; chemical gas sensor; concentration detections; decomposed components detection; decomposed gases; functional two-dimensional material; gas insulated switchgear equipment; graphene sensor; insulation level; microoxygen; microwater; partial discharge; preparation method; rGO sensor; real-time monitoring; reduced graphene oxide; relative resistance; scanning electron microscopy; sensitive characteristics; surface morphology; temperature 293 K to 298 K; test method; Graphene; Resistance; Sensitivity; Sulfur hexafluoride; Temperature; Temperature sensors;
Conference_Titel :
High Voltage Engineering and Application (ICHVE), 2014 International Conference on
Conference_Location :
Poznan
DOI :
10.1109/ICHVE.2014.7035485