Dissolved hydrogen limited value sensor in power transformer oil and detection system

Abstract

The invention discloses a dissolved hydrogen limited value sensor in power transformer oil and a detection system. The dissolved hydrogen limited value sensor comprises an optical fiber, wherein a grating is engraved on a fiber core of the optical fiber; a region, which corresponds to the grating, on the optical fiber is an optical fiber grating region; one side surface of a wrapping layer of the optical fiber grating region is polished into a planar polished surface; a hydrogen sensitive metal layer is attached to the polished surface. The limited value sensor is high in sensitivity and high in timeliness; once the concentration of dissolved hydrogen reaches a limited value, the wavelength change amount quickly reaches the limited value, so that a worker can timely and effectively find a fault to prevent further development of the fault. By adoption of an optical signal, the influence on a measurement result due to a complicated environment in a transformer can be avoided, the interference resistance is high, a detection signal is a wavelength, and the influence caused bv the factors such as the intensity of a light source signal, aging of a detector and connection loss is avoided. The dissolved hydrogen limited value sensor is simple in structure and is prepared based on the optical fiber; the diameter is small, and the limited value sensor is easily arranged in the transformer oil and convenient for detection; furthermore, normal operation of the transformer cannot be affected, and the limited value sensor is suitable for on-site application of the transformer.

Description

technical field [0001] The invention relates to a limit value sensor for dissolved hydrogen in power transformer oil, and also relates to a detection system composed of the limit value sensor for dissolved hydrogen in power transformer oil. Background technique [0002] The power transformer is the key equipment in the operation of the power grid, and the reliable operation of the power transformer has become one of the key factors for the reliable operation of the power grid. Under the action of heat and electricity, transformer oil decomposes into hydrogen, carbon monoxide, carbon dioxide, and various small molecule hydrocarbon gases. The type and severity of the internal faults of the equipment are closely related to the composition and gas production rate of these gas molecules. When a low-energy fault (partial discharge) occurs in the transformer, hydrogen is the main gas produced. This is mainly because low-energy faults easily break the weakest C-H bond, and most of ...

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Problems solved by technology

[0006] The disadvantage of the light intensity detection method is that the detection sensitivity is high and the response time is short, but the bending of the optical fiber has a great influence on the light intensity during the detection process. The optical fiber should be straightened as much as possible during the detection, and the loss of the optical fiber will affect the measurement results. Also larger and not suitable for long-distance measurements

However, the disadvantage of the wavelength detection method is that although the temperature detection response is faster in the wavelength detection method, this detection method needs to distinguish between the temperature change caused by hydrogen absorption and the ambient temperature change, and it is not easy to detect very small changes, and the sensitivity needs further improvement. improve

At the same time, because hydrogen reacts with the metal film to generate a large amount of heat, it may lead to aggravated faults in the complex environment of transformer oil, so it is not suitable for detection in transformer oil

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