A fault location device for oil-immersed transformer based on fiber Bragg grating

Abstract

The invention discloses an oil-immersed transformer fault location device based on an optical fiber Bragg grating and belongs to the scope of transformer fault detection equipment. The device uses a palladium-plated silver alloy film as a hydrogen sensor for dissolving hydrogen in oil. Specifically, a palladium-silver alloy film is plated on the grid area of ​​an optical fiber Bragg grating as a fiber Bragg grating hydrogen sensor for dissolving hydrogen in oil. A plurality of optical fiber Bragg grating hydrogen sensors are fused through single-mode optical fibers and arranged on each surface of the transformer cavity to realize three-dimensional monitoring of dissolved hydrogen in the transformer cavity. The invention overcomes the disadvantages of the existing fault location device, such as off-line hanging cover inspection, and the like, and can meet the special requirements of hydrogen production fault location inside the oil-immersed transformer. The sensor uses wavelength demodulation and is not affected by changes in light intensity. Moreover, the sensor will not cause harm to the operation of the transformer, and is safe and reliable.

Description

technical field [0001] The invention belongs to the scope of transformer fault detection equipment, in particular to an oil-immersed transformer fault location device based on an optical fiber Bragg grating. Background technique [0002] Power transformers are one of the most important and valuable equipment in the power system, and their safe operation is directly related to the power supply reliability of the power grid. The research on power transformer fault diagnosis technology is the basis of power transformer condition maintenance. Transformer is a system and equipment with complex aging and failure mechanism, so power transformer fault diagnosis technology is a complex and arduous task. Under the action of heat and electricity, insulating oil decomposes into hydrogen, carbon monoxide, carbon dioxide, and various small molecule hydrocarbon gases. The type and severity of internal faults in the equipment are closely related to the composition of these gas molecules an...

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Problems solved by technology

[0013] (1) The existing fault location method needs to carry out the inspection of the hanging cover, but the inspection of the hanging cover is a lot of work, time-consuming and laborious, and the transformer often has a serious fault when the hanging cover inspection is required

[0014] (2) The positioning error is relatively large when using methods such as multi-site analysis and sampling

[0015] (3) It is difficult to locate the fault location of the transformer with the existing positioning method when the transformer initially fails

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