Dissolved Gas Detection Device in Transformer Oil Based on Infrared Spectral Absorption

Abstract

The invention belongs to the technical field of electric equipment detection, and in particular relates to a detection device for dissolved gas in transformer oil based on infrared spectrum absorption. Including: light source system unit, composed of high-power supercontinuum broadband light source, light source controller and optical switch, to realize output multiplexing control of light source; sensor layout unit, composed of fiber Bragg grating hydrogen sensor series wavelength division multiplexing and hollow photonic crystal The two sensing paths of optical fiber spectral absorption sensing are arranged in the cavity of the oil-immersed power transformer; the detection acquisition and analysis unit is composed of a wavelength demodulation device, a light intensity detector, and a data acquisition and analysis device. The wavelength offset of the sensor and the intensity of spectral absorption are detected, and the data acquisition and analysis device records the data and calculates the type and content of the corresponding fault gas. On this basis, the insulation condition of the transformer oil is evaluated and located , analysis and forecasting.

Description

technical field [0001] The invention belongs to the technical field of electric equipment detection, and in particular relates to a detection device for dissolved gas in transformer oil based on infrared spectrum absorption. Background technique [0002] The transformer is one of the important electrical equipment in the power system. Once the transformer fails, it will bring serious consequences. Dissolved gas analysis in oil is one of the most effective methods for diagnosing latent faults in large oil-immersed power transformers. Dissolved gas analysis technology in transformer oil is based on the corresponding relationship between the type of dissolved gas in oil and internal faults. Gas chromatograph is used to analyze the gas dissolved in oil. According to the composition of gas and the content of various gases, it is judged whether there is any abnormality inside the transformer. Diagnose its fault type, approximate location, severity and development trend, and throu...

AI Technical Summary

Problems solved by technology

[0007] ②In the selection of characteristic absorption lines, Fourier transform infrared spectroscopy is limited by the length of the gas cell. Only by measuring at strong characteristic absorption can sufficient sensitivity be obtained. Therefore, sometimes it has to be measured at the overlap of gas characteristic absorption. Cross Sensitive Issues

[0008] ③Infrared detectors rely on the detection and analysis of photons to realize gas sensing, and the measurement sensitivity is low

[0010] ① It is necessary to use a permeable membrane or a vacuum to separate the gas from the oil, and it is necessary to lead the oil out of the transformer, the response time is long, and there is a risk of pollution

[0011] ②Electronic equipment such as a microphone is required, so the measurement sensor cannot be embedded in the transformer, which prolongs the response time and cannot perform gas positioning

[0013] ④The temperature, the type of background gas and the quality factor of the photoacoustic cell will all affect the measurement results of photoacoustic spectroscopy and limit the measurement accuracy

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