High-sensitivity spectral absorption damped oscillation cavity gas detection device of transformer oil

Abstract

The invention discloses a high-sensitivity spectral absorption damped oscillation cavity gas detection device of transformer oil in the scope of safety detection equipment of a power transformer. The gas detection device comprises a super-continuum spectrum broadband light source, an optical fiber annular damped oscillation cavity, a gain clamping unit and a light intensity detection unit; in a main cavity of the power transformer, the two ends of two columns of hollow photonic crystal fibers are connected high reflectivity optical devices or high reflectivity optical structures to form the optical fiber annular damped oscillation cavity; the two ends of the optical fiber annular damped oscillation cavity are connected with the super-continuum spectrum broadband light source and a gain clamping light path via optical fibers; the gain clamping light path is connected with the light intensity detection unit via an optical fiber; high accuracy time variation measurement is achieved by a topological design of the optical fiber annular damped oscillation cavity and the gain clamping light path; the system detection precision and sensitivity are improved; and the kind and content of dissolved gas in the transformer oil are analyzed and evaluated.

Description

technical field [0001] The invention belongs to the scope of safety detection equipment for power transformers, in particular to a high-sensitivity spectrum absorption attenuation oscillation chamber gas detection device in transformer oil. Background technique [0002] Gas composition and concentration measurement in oil-filled power transformers is a complex task, mainly because it is very difficult to select a suitable measurement and monitoring instrument and system. Over the years, scientists from various countries have done a lot of theoretical and experimental research on this issue, and have achieved some results. The main methods reported for on-site gas composition and concentration measurement include catalytic sintering, electrochemical gas chromatography, semiconductor absorption, thermal conductivity sensing, laser absorption, and optical fiber sensing. These methods have completed the measurement tasks of flammable, explosive, toxic and harmful gases to varyi...

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Problems solved by technology

[0008] ② It is also greatly affected by the external environment, especially the change of humidity and temperature directly affects the sensitivity of the sensor;

[0009] ③Easily affected by other gases;

[0010] ④ The measurement range is small, generally below 5%

For the catalytic combustion gas sensor, since the temperature of the gas is as hi

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