Online measurement system for dissolved methane in transformer oil

Abstract

The invention discloses an online measurement system and method for dissolved methane in transformer oil. The system for measuring the dissolved methane in the transformer oil comprises a broadband light source used for generating broadband light with the wavelength range of 1528-1605nm; the conical optical fiber methane sensor is coated with a methane sensitive film and is used for measuring the concentration of methane in transformer oil; and the spectrum analyzer and the computer are used for reading spectrums and demodulating data. Wherein the optical fiber sensor with the conical structure is formed by performing fused biconical taper on a single-mode optical fiber, the surface of the conical optical fiber is coated with a methane sensitive film after biconical taper, and the sensitive film is an ultraviolet curing fluorosiloxane (UVCFS) porous methane sensitive film containing a cage molecule Cryptophane-A. The conical optical fiber methane sensor can be directly placed in transformer oil, when methane molecules in the transformer oil to be measured act on cage molecules Cryphanane-A in the sensitive film, the refractive index of the sensitive film changes rapidly, an interference spectrum formed by broadband light passing through the conical optical fiber shifts, and by measuring the wavelength offset of the interference spectrum, the sensitivity of the transformer oil to be measured is improved. The methane gas concentration in the transformer oil to be detected can be obtained. The invention has the characteristics of no need of oil-gas separation, transformer oil corrosion resistance, high sensitivity, good stability and the like.

Description

technical field [0001] The invention provides an online measurement system for dissolved methane in transformer oil, which is used for measuring the concentration of dissolved methane in transformer oil, and belongs to the technical field of online monitoring of high-voltage electrical equipment. Background technique [0002] With the steady improvement of the national economy and the quality of life, the scale of the intelligent grid is gradually expanding, and the requirements for the power supply quality and safe and reliable operation of the grid are getting higher and higher. As the core equipment of power transmission and distribution in the power grid, the safe and reliable operation of the power transformer will directly affect the normal supply of electric energy in the power system. The failure of power transformers will lead to large-scale power outages, which may cause huge economic losses and social impacts. [0003] At present, most of the power transformers i...

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Problems solved by technology

[0005] The invention proposes a tapered optical fiber transformer oil dissolved methane measurement system based on a methane-sensitive film, which solves the problems of oil-gas separation, long detection cycle, and long detection cycle in the prior art, and realizes the dissolved methane in transformer oil. Fast Online Monitoring of Methane

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