CN204027725U - A kind of sonde-type FBG temperature sensor of measuring transformer oil temperature - Google Patents
A kind of sonde-type FBG temperature sensor of measuring transformer oil temperature Download PDFInfo
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- CN204027725U CN204027725U CN201420340518.5U CN201420340518U CN204027725U CN 204027725 U CN204027725 U CN 204027725U CN 201420340518 U CN201420340518 U CN 201420340518U CN 204027725 U CN204027725 U CN 204027725U
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- optical fiber
- fiber bragg
- bragg raster
- temperature sensor
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Abstract
Denomination of invention: a kind of sonde-type FBG temperature sensor of measuring transformer oil temperature.The utility model belongs to photoelectron measuring element technical field.Comprise: the polymkeric substance enhanced sensitivity encapsulating material of large expansion coefficient (1), refractory ceramics (2), quartz packaged (3), securing member connecting interface (4), connected set pipe MIL-C-85723 (5), optical fiber contact pins connector (6), stainless steel casing (7), teflon sleeve (8), optical fiber Bragg raster (9), draw optical fiber (10).Optical fiber Bragg raster (9) with draw optical fiber (10) welding after being connected, (8) entangling and protect by teflon sleeve; (1) adopt (9) optical fiber Bragg raster is encapsulated with the polymkeric substance enhanced sensitivity material of large expansion coefficient; (2) wrap up mutually with refractory ceramics outside; again by quartz packaged (3) it is closely fixed on stainless steel casing (7) in; avoid optical fiber Bragg raster to be subject to extraneous extrusion and collision, improved inner stability.Securing member connecting interface is (4) convenient to be connected with external optical fiber.
Description
Technical field
The present invention relates to a kind of sonde-type FBG temperature sensor of measuring oil temperature of power transformer, belong to photoelectron field of measuring technique.
Background technology
Power transformer is the visual plant of transformer station, is the hinge link of electric system, is bearing the important tasks such as the boosting of electrical network, step-down and voltage-regulation.In recent years, along with the raising of China's expanding economy and living standards of the people, need for electricity amount increases rapidly, and the scale of electrical network constantly expands, and electric pressure improves constantly, and the single-machine capacity of transformer constantly increases, and causes the failure rate of transformer also to increase thereupon.Understanding in time the operation conditions of transformer, the position that may break down is overhauled, is the important measures that reduce transformer fault rate, improve transformer safety in operation.Traditional temperature detection means are mainly thermopairs; Office puts to detect and relies on high-frequency signal to detect and piezoelectric ceramic ultrasonic sensor; Transformer oil bubbing detects main semiconductor or the electrochemical sensor of relying on.Above-mentioned electricity detection technique all obtained success in various degree, but also there is limitation: comprise that (1) is subject to strong-electromagnetic field and ambient noise interference; (2) gas sensor poor selectivity etc.(Du Jianbo, Wei Yubin, Liu Tongyu, the applied research of optical fiber sensing technology in transformer state detects, protection and control is drawn, 2008 by electric power system)
With the immediate technology of this patent be Lu Yangming, " oil temperature of power transformer monitoring device " " power and electrical engineering ", 6 periodicals in 2013.In the document, mention and designed a kind of small-sized integrated oil temperature of power transformer measurement mechanism, this device integrates platinum resistance temperature sensor, controller, communication unit.This temperature measuring equipment is subject to the impact of the factors such as electromagnetism, transmission range, conductor resistance.
Summary of the invention
The object of this invention is to provide a kind of sonde-type and measure the FBG temperature sensor of oil temperature of power transformer.Realize the real time on-line monitoring to temperature of oil in transformer, strong interference immunity, accuracy is high.
Realizing the technical scheme that above-mentioned purpose of the present invention takes is: this sensor comprises polymkeric substance enhanced sensitivity encapsulating material (1), refractory ceramics (2), quartz packaged (3), securing member connecting interface (4), the connected set pipe MIL-C-85723(5 of large expansion coefficient) optical fiber contact pins connector (6), stainless steel casing (7), teflon sleeve (8), optical fiber Bragg raster (9), draw optical fiber (10).Optical fiber Bragg raster (9) is entangled and is carried out internal protection by teflon sleeve (8) with drawing after optical fiber (10) welding is connected; adopt the mode of die casting to carry out time encapsulation to optical fiber Bragg raster (9) with the polymkeric substance enhanced sensitivity encapsulating material (1) of large expansion coefficient; the outside refractory ceramics (2) of using wraps up mutually; by quartz packaged (3), it is closely fixed on to stainless steel casing (7) inside again; avoid optical fiber Bragg raster to receive from extraneous extrusion and collision, improved inner stability.Be connected with external fiber optic connector and securing member connecting interface (4) is convenient, owing to having adopted the polymer encapsulated Bragg grating of large expansion coefficient, therefore improve the sensitivity of fiber-optic grating sensor.
Fiber Bragg Grating Temperature sensor, by the test hole of transformer, is inserted in the oil of power transformer, guarantees that sensor can detect the temperature of oil-immersed power transformer oil.When oil-immersed power transformer produces a large amount of heats because of contact loose contact, magnetic circuit fault, conductor failure and other reasons, heat passes to stainless steel casing by electric power transformer oil, and then be passed to optical fiber Bragg raster in the polymkeric substance that is wrapped in the large expansion coefficient in refractory ceramics, cause the displacement of Bragg optical grating reflection wavelength, because elasto-optical effect and waveguiding effect are on the not significant impact of the wavelength of fiber grating, only, by thermal expansion effects and the optical fiber thermo-optic effect of optical fiber, cause the variation of reflection peak wavelength.So by the wavelength-shift amount of the detection fiber Bragg grating that is connected with fiber grating Decoder, finally reach the object of the temperature of electric power transformer oil being carried out to Real-Time Monitoring.
The mathematical model of the technology of the present invention is as follows:
The peak value centre wavelength reflecting due to optical fiber Bragg raster meets:
(1)
Adopt the polymkeric substance of large expansion coefficient to carry out the mode of die casting, can carry out enhanced sensitivity encapsulation to optical fiber Bragg raster, design and produce highly sensitive Fiber Bragg Grating Temperature sensor.The object of encapsulation changes and can cause that the grid cycle Λ of optical fiber Bragg raster changes in ambient temperature again, and then causes the central wavelength lambda of grating
bdrift about, realize the temperature sensing of optical fiber Bragg raster.
Or else be subject under any External Force Acting packed optical fiber Bragg raster central wavelength lambda
bshift amount Δ λ
bwith ambient temperature variation delta
tpass be:
(2)
In (2) formula, α is the thermal expansivity of fiber grating, its expression formula
; ξ is the thermo-optical coeffecient of fiber grating, and its expression formula is
; p
evalid round backscatter extinction logarithmic ratio, α
sfor the thermal expansivity of encapsulating material, scale-up factor κ
t it is temperature
ttransduction factor.
(3)
In (3) formula, Fiber Bragg Grating Temperature center sensor wavelength-shift amount Δ λ
bwith ambient temperature variation delta
tlinear.By the centre wavelength shifts delta λ of measuring optical fiber Bragg grating
bthe optical fiber Bragg grating sensor that can calculate sonde-type measuring transformer oil temperature ambient temperature variation delta now
t.
Generally concerning fused quartz optical fiber,
,
, by selecting the encapsulation polymeric material of different large expansion coefficient, can determine the thermalexpansioncoefficientα of encapsulating material
ssize, design the Fiber Bragg Grating Temperature sensor with different sensitivity size.
The invention has the beneficial effects as follows:
1, this sensor is the temperature of utilizing optical fiber Bragg raster measuring transformer oil, because optical fiber Bragg raster is electrically insulating material, has anti-electromagnetic interference (EMI), without electrical transmission ability, is applicable to the measurement of the temperature of oil in transformer in strong electromagnetic situation.
2, by the polymkeric substance of selecting different large expansion coefficient, optical fiber Bragg raster is encapsulated, realized the adjustable of this temperature sensor sensitivity.
3, adopt multilayer encapsulation technology, ensured that optical fiber Bragg raster do not receive the impact of stress, strain factor.
Brief description of the drawings
Fig. 1 is the structural representation of the sonde-type FBG temperature sensor of measuring transformer oil temperature.
In figure, each label represents successively: polymkeric substance enhanced sensitivity encapsulating material (2) refractory ceramics (3) quartz packaged (4) of (1) large expansion coefficient connects securing member interface (5) connected set pipe MIL-C-85723(6) optical fiber contact pins connector (7) stainless steel casing (8) teflon sleeve (9) optical fiber Bragg raster (10) draws optical fiber.
Embodiment
Optical fiber Bragg raster 9. with draw optical fiber 10. welding after being connected, 8. entangling and carry out internal protection by teflon sleeve; 1. adopt the mode of die casting 9. to carry out time encapsulation to optical fiber Bragg raster with the polymkeric substance enhanced sensitivity encapsulating material of large expansion coefficient; 2. wrap up mutually with refractory ceramics outside; 3. it is closely fixed on to stainless steel casing by quartz packaged more 7. inner; avoid optical fiber Bragg raster to receive from extraneous extrusion and collision, improved inner stability.Be connected with external fiber optic connector and securing member connecting interface is 4. convenient, draw optical fiber 10. from connected set pipe MIL-C-85723 5. interior optical fiber contact pins connector 6. draw, finally complete the overall package of Fiber Bragg Grating Temperature sensor.
According to structure shown in Fig. 1, packaged fiber Bragg grating:
1, the parameter of optical fiber contact pins connector is: length L=2mm, width D=1mm.
2, the parameter of connected set pipe MIL-C-85723 is: length L=10mm, width D=4mm.
3, the parameter of stainless steel casing is: overall length L=70mm, the oil temperature probe outer casing width D1=4mm of bottom place, the outer casing width D2=12mm of securing member interface bottom place.
4, the technical parameter of optical fiber Bragg raster is: central wavelength lambda
b=1550.00mm.
5, obtain the centre wavelength shift amount of optical fiber Bragg raster with fiber grating Decoder.
Claims (1)
1. the Fiber Bragg Grating Temperature sensor of a measuring transformer oil temperature, it is characterized in that: optical fiber Bragg raster (9) is entangled and carried out internal protection by teflon sleeve (8) with drawing after optical fiber (10) welding is connected, adopt the mode of die casting to carry out time encapsulation to optical fiber Bragg raster (9) with the polymkeric substance enhanced sensitivity encapsulating material (1) of large expansion coefficient, the outside refractory ceramics (2) of using wraps up mutually, by quartz packaged (3), it is closely fixed on to stainless steel casing (7) inside again, avoid optical fiber Bragg raster to receive from extraneous extrusion and collision, improve inner stability, be connected with external fiber optic connector and securing member connecting interface (4) is convenient, draw optical fiber (10) from connected set pipe MIL-C-85723(5) in optical fiber contact pins connector (6) draw, finally complete the overall package of Fiber Bragg Grating Temperature sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420340518.5U CN204027725U (en) | 2014-06-25 | 2014-06-25 | A kind of sonde-type FBG temperature sensor of measuring transformer oil temperature |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420340518.5U CN204027725U (en) | 2014-06-25 | 2014-06-25 | A kind of sonde-type FBG temperature sensor of measuring transformer oil temperature |
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|---|---|
| CN204027725U true CN204027725U (en) | 2014-12-17 |
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| CN201420340518.5U Expired - Fee Related CN204027725U (en) | 2014-06-25 | 2014-06-25 | A kind of sonde-type FBG temperature sensor of measuring transformer oil temperature |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104977098A (en) * | 2015-07-16 | 2015-10-14 | 吉林大学 | High-sensitivity fiber grating temperature sensor with fast response speed |
| CN106153214A (en) * | 2016-07-20 | 2016-11-23 | 深圳先进技术研究院 | For the temperature sensor within oil-immersed type transformer and manufacture method thereof |
| CN109357786A (en) * | 2018-12-03 | 2019-02-19 | 湖北工业大学 | A kind of system for detecting temperature and method based on sapphire fiber grating sensor |
| CN111256868A (en) * | 2019-12-13 | 2020-06-09 | 中复神鹰碳纤维有限责任公司 | Pipeline fluid temperature sensor based on fiber bragg grating |
-
2014
- 2014-06-25 CN CN201420340518.5U patent/CN204027725U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104977098A (en) * | 2015-07-16 | 2015-10-14 | 吉林大学 | High-sensitivity fiber grating temperature sensor with fast response speed |
| CN106153214A (en) * | 2016-07-20 | 2016-11-23 | 深圳先进技术研究院 | For the temperature sensor within oil-immersed type transformer and manufacture method thereof |
| CN106153214B (en) * | 2016-07-20 | 2020-02-18 | 深圳先进技术研究院 | Temperature sensor for interior of oil immersed transformer and manufacturing method thereof |
| CN109357786A (en) * | 2018-12-03 | 2019-02-19 | 湖北工业大学 | A kind of system for detecting temperature and method based on sapphire fiber grating sensor |
| CN111256868A (en) * | 2019-12-13 | 2020-06-09 | 中复神鹰碳纤维有限责任公司 | Pipeline fluid temperature sensor based on fiber bragg grating |
| CN111256868B (en) * | 2019-12-13 | 2023-09-26 | 中复神鹰碳纤维股份有限公司 | Pipeline fluid temperature sensor based on fiber bragg grating |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141217 Termination date: 20150625 |
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