1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China 2. Wuhan University Wuhan 430079 China
Abstract：A close relationship is existed between SF6 partial discharge decomposition components and the insulation condition in gas insulated switchgear(GIS). Monitoring the decomposition components can diagnose the insulated defect of GIS. The SF6 partial discharge decomposition components are low concentration. To enhance the detection limit, a long optical path gas cell is designed based on the White cell, and the essential parts of the equipment are three conjugated spherical mirrors, which gained long optical paths by the light’s multiple reflections in it, reducing the energy dissipation while increasing the optical paths, 20 meters optical length gas cell matching with Fourier transform infrared spectroscopy (FTIR) is developed. Long and short optical paths gas-cells are used to detect the SF6 partial discharge decomposition components. It’s found that the 20 meters’ optical length gas cell’s spectrum has a great gas species, high degree of accuracy and signal-to-noise ratio. 20 meters gas cell can fulfill SF6 partial discharge decomposition components’ quantify research.
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2012, Vol. 27 
