Micro-nanofiber sensor used for detecting dissolved hydrogen in transformer oil

Abstract

The invention discloses a micro-nanofiber sensor used for detecting dissolved hydrogen in transformer oil. The micro-nanofiber sensor comprises a laser transmitter, a micro-nanofiber, a photoelectric detector and a control module, wherein the micro-nanofiber is placed in to-be-detected transformer oil; the surface of the micro-nanofiber is coated with a hydrogen-sensitive film; the output terminal of the laser transmitter is connected with the input terminal of the micro-nanofiber via a connection fiber; the control terminal of the laser transmitter and the output terminal of the photoelectric detector are electrically connected with the control module separately; and the control module controls the transmission parameters of the laser transmitter and calculates the concentration of hydrogen according to a power signal output by the photoelectric detector. The micro-nanofiber sensor provided by the invention overcomes the shortcomings of conventional optical-fiber hydrogen sensors and improves the vibration resistance and response speed of the optical-fiber hydrogen sensors.

Description

technical field [0001] The invention belongs to the technical field of gas sensing, and in particular relates to a micro-nano optical fiber sensor for detecting dissolved hydrogen in transformer oil. Background technique [0002] Oil-immersed power transformers gradually age due to long-term effects of heat, electricity and mechanical forces during operation, producing hydrogen, acetylene, methane, ethane, ethylene, carbon dioxide, carbon monoxide and other small molecule flammable gases. The type and severity of internal oil-paper insulation failures are related to the type, composition and rate of flammable gas generation. Among them, in the latent fault stage, the low-energy discharge fault (partial discharge) inside the transformer mainly causes the breakage of the C-H chemical bond in the insulating oil, and the cracked hydrogen atoms may recombine into hydrogen molecules, dissociate and dissolve in the insulating oil. Therefore, the occurrence of latent faults or the ...

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Problems solved by technology

The fiber grating hydrogen sensor is small in size, has good sensitivity and repeatability, and is practical in some occasions and fields, but considering that the grating period is affected by both strain and temperature, there is a problem of temperature cross-sensitivity

[0012] In addition to the initial simple application of fiber grating type in oil-immersed power transformers, other types of optical sensors have not yet been applied in power transformers

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