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A Pressure and temperature (P&T) monitoring system based on fiber Bragg grating (FBG) and extrinsic Fabry-Perot interferometer (EFPI) for downhole application is designed and tested. The system is electronically passive, with no electronics downhole, and can monitor downhole pressure and temperature continuously without breaking in production of oil well. It is demonstrated in experimental well...
Because of its high-capacity, low losses and no electromagnetic interference, the gas-insulated transmission line (GIL), which is a replacement of an overhead line in special environments, has been used for over 40 years, mainly as bus ducts of gas-insulated substations or underground connections in power plants. The insulated and cooling gas in GIL is mainly SF6 or its mixtures, which have high global...
SF6 gas has been widely used currently in electric power systems, such as GIS, GIL and GIT. However, because of the high global warming potential (GWP), SF6 was listed as one of the six restricted gases in "Kyoto Protocol" in 1997. Some fluorocarbon gases with low environmental effect and high dielectric performance are studied as the substitution candidates for SF6. This paper presents...
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