Fiber Bragg grating temperate sensor for oil-immersed transformer
A technology of temperature measurement sensor and fiber grating, applied in thermometers, instruments, thermometers and other directions with physical/chemical changes, can solve the problems of reduced accuracy, easy pollution of oil and gas, increased measurement errors, etc., to avoid inaccuracy and good resistance. The effect of high temperature oil immersion performance
Active Publication Date: 2013-07-24
WUHAN WUTOS
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to provide an internal winding of the oil-immersed transformer for the defects that the temperature measuring equipment installed on the transformer in the prior art is easy to pollute oil and gas after running for a period of time, the accuracy is reduced, and the measurement error is increased. Fiber Bragg grating temperature sensor with high measurement accuracy and direct temperature measurement of other key monitoring parts
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[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0021] like figure 1 As shown, the fiber Bragg grating temperature sensor used in the embodiment of the present invention for oil-immersed transformers includes a fiber Bragg grating and an insulating casing 2; the fiber Bragg grating includes a sensing grating 1 and an optical fiber 6 connected thereto. Sensing grating 1 can choose Bragg grating.
[0022] The sensor grating 1 is provided with a high temperature resistant coating layer, which is a polyimide coating in the embodiment of the present invention. The polyimide-coated sensing grating 1 is stable at temperatures up to 300°C, ensuring pr...
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The invention discloses a fiber Bragg grating temperate sensor for an oil-immersed transformer. The fiber Bragg grating temperate sensor is characterized by comprising a fiber Bragg grating and an insulated housing, wherein a high temperature resistant coating layer is arranged outside a sensing grating of the fiber Bragg grating; a first high temperature resistant protective sleeve is sleeved outside a tail fiber of the fiber Bragg grating; the sensing grating and partial tail fiber are packaged inside the insulated housing; and filling material resistant to organic solvent is filled in the insulated housing. The fiber Bragg grating temperate sensor disclosed by the invention has good high temperature resistant oil immersion performance, and can be placed in transformer insulating oil for long-term use; and direct temperature measurement of windings and other important monitoring parts inside the oil-immersed transformer can be realized, so that the problems that indirect measurement of electric sensors is not accurate, not in real time and not visual are avoided.
Description
technical field [0001] The invention relates to an optical fiber grating sensor, in particular to an optical fiber grating temperature measuring sensor used for an oil-immersed transformer. Background technique [0002] The power transformer is one of the important electrical equipment in the power system, and its operating status has a great relationship with the safe and reliable operation of the power system. For oil-immersed transformers, its life is actually mainly the life of solid insulation. The main factors that promote insulation aging are temperature, moisture and oxygen, among which the thermal effect is the most prominent when the transformer is loaded. It can be said that the thermal effect is the decisive factor for the aging of transformers. That is to say, the thermal aging speed of the transformer winding insulation is related to the hot spot temperature of the winding. Therefore, for real-time monitoring of transformer winding temperature, it is particu...
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IPC IPC(8): G01K11/32G01K11/3206
Inventor 张橙王丹蔡安董雷印新达
Owner WUHAN WUTOS