Anti-electromagnetic-interference in-situ measurement system and method for dissolved gas in oil

Abstract

The invention discloses an anti-electromagnetic-interference in-situ measurement system and method for dissolved gas in oil, and belongs to the technical fields of electrical equipment insulation monitoring, optical fiber gas sensing and photoacoustic spectroscopy. Small molecular gas dissolved in oil is diffused into a micro-cavity of an optical fiber photoacoustic sensing probe through an oil-gas separation membrane; photoacoustic pressure waves generated by light absorption of gas molecules to be measured separated from the microcavity are detected by an optical fiber Fabry-Perot interference type cantilever beam, the temperature and the photoacoustic pressure are measured at the same time by adopting an optical cross-correlation demodulation method, and temperature compensation is performed on a photoacoustic pressure value by utilizing the measured temperature. An optical fiber sensing probe integrating a miniature photoacoustic gas chamber and an oil-gas separation membrane is adopted, and photoacoustic exciting light and detection light are transmitted by adopting optical fibers, so the photoacoustic gas sensing probe has an electromagnetic immune characteristic, and long-distance optical fiber remote measurement is realized. The system does not need oil pumping, the potential safety hazard of transformer oil leakage does not exist, transformer oil does not make contactwith air, an oil sample cannot be polluted or consumed, and therefore, the in-situ measurement can be achieved.

Description

technical field [0001] The invention belongs to the technical fields of electrical equipment insulation monitoring, optical fiber gas sensing and photoacoustic spectroscopy, and relates to an anti-electromagnetic interference in-situ measurement system and method for dissolved gas in oil. Background technique [0002] With the advancement of the construction of the ubiquitous power Internet of Things, my country will establish a comprehensively aware smart energy system. Sensing technology is the core basic technology of the power Internet of Things, and real-time monitoring of electrical equipment failures is an important means to ensure the safe operation of the power grid. As the core component connecting different voltage levels, the power transformer has a direct relationship to the stable and safe operation of the power system. At present, large-scale power transformers generally use oil-immersed transformers, and insulating oil is a mixture of hydrocarbon molecules w...

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Problems solved by technology

[0004] The purpose of the present invention is to propose an anti-electromagnetic interference in-situ measurement system and method for dissolved gas in oil, aiming to solve the problem that the current photoacoustic spectroscopy transformer oil dissolved gas analysis device is su...

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