Detecting characteristics of SF₆ decomposed gas sensor for insulation diagnosis on gas insulated switchgears

Projects for Predictive Maintenance and Operation between COPET G&T and Gnarus Institute

“…The next decade, in 2001, was inaugurated by Lundgaard's work [44], which located defects in insulated substations through acoustic signature. In 2008, Okabe and coauthors [45] published an article on detecting the decomposition of SF6 gases, causing isolation problems in the armored substations.…”

Low-Temperature Detection of Sulfur-Hexafluoride Decomposition Products Using Octahedral Co3O4-Modified NiSnO3 Nanofibers

“…SF 6 is extensively used in gas-insulated switches (GIS) and gas-insulated transmission lines (GIL) because of its outstanding arc extinguishing and insulation characteristics. , Spark discharge and partial discharge defects may develop during the long-term operation of the equipment, and the SF 6 gas decomposes to different low-fluorine sulfides (SF x ) due to high electrical discharge energy . The major breakdown products of SF 6 are sulfuryl fluoride (SO 2 F 2 ), thionyl fluoride (SOF 2 ), sulfur dioxide (SO 2 ), and hydrogen sulfide (H 2 S), which will damage and decrease the insulation strength of SF 6 -insulated equipment. − Therefore, an efficient technique for the accurate detection of SF 6 decomposition products is essential to guarantee the operational stability of SF 6 -insulated equipment . In the last decade, various methods, such as infrared absorption spectrometry, gas chromatography, and photoacoustic spectroscopy, have been used to detect and remove SF 6 breakdown products, but they have a lengthy detection cycle and are expensive, making them unsuitable for real-time gas composition analysis. − …”

Highly Sensitive and Precise Analysis of SF6 Decomposition Component CO by Multi-comb Optical-feedback Cavity Enhanced Absorption Spectroscopy with a 2.3 μm Diode Laser

“…Besides, CO can also be used as a criterion to evaluate and predict the severity and developing trend of partial discharge fault, such discharge fault will provide energy to break molecular bonds of O 2 to produce O atom, which will react with C atom from decomposition of organic solid insulating materials, then CO releases. Therefore, there is considerable interest in developing an online, cost-effective, highly sensitive and precise CO sensor in SF 6 , SO 2 , H 2 S, SO 2 F 2 , HF, CF 4 , CO 2 , COS, O 2 and H 2 O for fault diagnosis of gas insulated electrical equipment 3–5 . The minimum detection limit of CO sensor should achieve 200 ppb according to the Institution of Engineering and Technology and China Power Industry standard 6 .…”