Gas detection device in transformer oil with high-sensitivity spectral absorption attenuation oscillation cavity

Abstract

The invention discloses a high-sensitivity spectrum absorption attenuation oscillation chamber gas detection device in transformer oil belonging to the safety detection equipment range of power transformers. The gas detection device consists of a supercontinuum broadband light source, an optical fiber ring attenuation oscillation cavity, and a gain clamping unit It is composed of a light intensity detection unit; inside the main chamber of the power transformer, a high-reflectivity optical device or a high-reflectivity optical structure is connected to each of the two ends of the two rows of hollow photonic crystal fibers to form a fiber ring attenuation oscillation cavity. It is connected to the supercontinuum broadband light source and the gain clamping optical path at both ends of the optical fiber ring attenuating oscillation cavity, and the gain clamping optical path is connected to the light intensity detection unit through the optical fiber; the high-precision time is realized by using the topology design of the optical fiber ring attenuating oscillation cavity and the gain clamping optical path Variation measurement, improve system detection accuracy and sensitivity; analyze and evaluate the type and content of dissolved gas in transformer oil.

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 high as 900°C when the metal catalytic coil burns, the diameter of the catalyst becomes thinner due to surface evaporation, which increases the resistance value and causes serious zero point drift of the instrument, so frequent Calibrate the instrument; at the same time, because the sensor works at high temperature, it is potentially dangerous

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