CN204988203U - Measure dry -type air -core reactor and seal optic fibre bragg bragg grating strain sensor who meets an emergency - Google Patents
Measure dry -type air -core reactor and seal optic fibre bragg bragg grating strain sensor who meets an emergency Download PDFInfo
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- CN204988203U CN204988203U CN201520624610.9U CN201520624610U CN204988203U CN 204988203 U CN204988203 U CN 204988203U CN 201520624610 U CN201520624610 U CN 201520624610U CN 204988203 U CN204988203 U CN 204988203U
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- optic fibre
- type air
- core reactor
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- dry
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- 239000000835 fiber Substances 0.000 title claims abstract description 45
- 239000000463 material Substances 0.000 claims abstract description 28
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- 229920000647 polyepoxide Polymers 0.000 claims description 18
- 230000000694 effects Effects 0.000 abstract description 3
- 239000004593 Epoxy Substances 0.000 abstract 2
- -1 polytetrafluoroethylene Polymers 0.000 abstract 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 abstract 2
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Abstract
The utility model relates to a measure dry -type air -core reactor and seal optic fibre bragg bragg grating strain sensor who meets an emergency belongs to light electronic measurement technique field. The utility model discloses optic fibre bragg grating connection of after section has optic fibre, and the optic fibre of drawing is worn out from ferrule to it is fixed with the epoxy adhesion, play the effect of protection optic fibre, polytetrafluoroethylene material intermediate position has a sharp recess for plant and bury optic fibre bragg grating and connect optic fibre, optic fibre bragg grating is placed at the recess intermediate position, and optic fibre bragg grating and connection optic fibre are hugged closely the recess bottom and is filled whole recess with epoxy, encapsulate into the rectangle structure with polytetrafluoroethylene material an organic whole. The utility model discloses simple structure, small and the durability good, can bury to seal insidely at dry -type air -core reactor, is applicable to the straingauging among the forceful electric power magnetic field environment.
Description
Technical field
The utility model relates to a kind of fiber Bragg Grating Strain Sensor device measuring dry-type air-core reactor encapsulating strain, belongs to technical field of electronic measurement.
Background technology
For adapting to the demand of the economic construction increased fast, China's electrical network is to the future development of Large Copacity, remote and extra-high voltage, and net capacity and power load constantly increase.Dry-type air-core reactor because of its dry type without oil, physical strength is high, eddy current loss is little, noise is low, be convenient to the advantages such as maintenance is widely used in electric system, 110kV and above transformer station many employings dry-type air-core reactor carry out reactive-load compensation.Simultaneously, dry-type air-core reactor because of its electromagnetic structure more special, encapsulating the impact of the factor such as long-time expanded by heating and electromagnetic force and produce ess-strain, is the equipment of more problems in transformer station, to many potential safety hazards that the safety and stability of electric system is brought.In recent years, along with the increase of the application of large-scale dry-type air-core reactor, in its normal operation, burning damage accident frequently occurs.Run a period of time in electrical network after, there is tree discharge, localized burn in a lot of dry-type air-core reactor to some extent, even on fire etc., have impact on the stable operation of electrical network.Especially the fault of the dry type hollow shunt reactor of 35kV and above remains high, some forced outage process, the accident that develops into the even equipment burnout had.Therefore, the on-line monitoring of dry-type air-core reactor health has become and has safeguarded power system security and stable important subject.
At present, few to the method for dry-type air-core reactor strain monitoring, technology is backwardness relatively, is badly in need of a kind of on-line monitoring technique that can realize strain measurement to it.In order to accurate measurements dry-type air-core reactor strain variation situation, in time send early warning signal, ensure reactor normally work, the best way imbeds strain transducer in dry-type air-core reactor.According to the architectural feature of dry-type air-core reactor, require can not contain metal construction in the sensor imbedded, and the small volume of sensor.Fiber grating sensing technology is solve the problem to provide a feasible method, and rational imbedded fiber Bragg grating strain transducer structural design can realize the monitoring of dry-type air-core reactor strain well.
Under the background of above-mentioned practical problems, have devised a kind of fiber Bragg Grating Strain Sensor device measuring dry-type air-core reactor encapsulating strain.This sensor construction is simple, volume is little, cost is low, electromagnetism interference, easy to operate.Sensor is embedded in dry-type air-core reactor encapsulating inner, the measurement of dry-type air-core reactor encapsulating strain in running can be realized.
Summary of the invention
The technical problems to be solved in the utility model is: the utility model provides a kind of fiber Bragg Grating Strain Sensor device measuring dry-type air-core reactor encapsulating strain, for the structure, the installation question that solve sensor during dry-type air-core reactor strain detecting.
Technical solutions of the utility model are: a kind of fiber Bragg Grating Strain Sensor device measuring dry-type air-core reactor encapsulating strain, comprises polytetrafluoroethylmaterial material 1, groove 2, optical fiber Bragg raster 3, optical fiber 4, ferrule 5, epoxy resin 6; Described polytetrafluoroethylmaterial material 1 is rectangular, having a groove 2 running through whole material plate body, burying optical fiber Bragg raster 3 for planting in the middle of polytetrafluoroethylmaterial material 1; Optical fiber Bragg raster 3 afterbody is connected with optical fiber 4, the optical fiber 4 of drawing passes from ferrule 5, ferrule 5 port inside scribbles epoxy resin 6 for being adhered fixed optical fiber 4, optical fiber Bragg raster 3 is placed on groove 2 centre position, with epoxy resin 6, optical fiber Bragg raster 3 and connecting fiber 4 thereof are encapsulated in bottom groove 2, make itself and polytetrafluoroethylmaterial material 1 be encapsulated into one.
Principle of work of the present utility model is:
See accompanying drawing 1, the polytetrafluoroethylmaterial material 1 being pasted on tested body structure surface bears tested structural deformation, causes the displacement of Bragg wavelength generation with strain variation of the optical fiber Bragg raster 3 be embedded in polytetrafluoroethylmaterial material 1.
If the effective strain length of sensor is L, meet with stresses as F, cross-sectional area is A, and elastic modulus is E, and length variations amount is
, strain and be
, the strain of optical fiber Bragg raster is
, so:
（1）
（2）
Wherein
,
for constant coefficient.
The ess-strain of setting FBG and encapsulating material is rigid of transmission, and so to encapsulate the strain of the polytetrafluoroethylmaterial material structure that stress causes equal with the strain of FBG for dry-type air-core reactor:
（3）
FBG strain variation amount and Bragg wavelength-shift proportional:
（4）
Because effect external force on a sensor and temperature field around all can cause Bragg centre wavelength to produce drift.So, Bragg center wavelength variation amount
can be expressed as:
（5）
In formula,
for fiber axis to strain variation amount,
for the temperature variation around sensor,
with
be respectively gage factor and temperature sensitive coefficient.
From formula (5), temperature and strain all can cause the drift of FBG center sensor wavelength.In order to draw the dependent variable of measured object, adopting the wavelength response that the method cancellation temperature variation of temperature compensation causes, thus calculating required dependent variable.The difference of the wavelength shift that total wavelength shift and temperature variation cause is only relevant with strain, just can obtain the strain that measured object occurs thus:
（6）
In formula
for the drift value that temperature makes FBG strain transducer centre wavelength produce.
Thus, this sensor is embedded to the inner measurement that can realize dry-type air-core reactor strain of dry-type air-core reactor encapsulating.In addition, gage factor
with temperature sensitive coefficient
concrete numerical value determined by the actual demarcation of sensor.
Use procedure of the present utility model is:
Concrete steps are as follows:
Step1, after dry-type air-core reactor encapsulating 10 completes, between adjacent two air duct slats 9 in encapsulating surface, along laying grid cloth 7 from top to bottom from dry-type air-core reactor encapsulating 10;
Step2, grid cloth 7 apart under edge
ldistance, bottom-up painting insulating gel 8 to grid cloth 7 upper end;
After Step3, the fiber Bragg Grating Strain Sensor device 2 being measured dry-type air-core reactor encapsulating strain and 1 temperature compensation sensor 11 epoxy resin dipping 6, in distance grid cloth 7 lower end
lthe fiber Bragg Grating Strain Sensor device and temperature compensation sensor 11 of measuring dry-type air-core reactor strain is laid in distance areas; 3 sensors are isosceles triangle arrangement, wherein 2 fiber Bragg Grating Strain Sensor devices measuring dry-type air-core reactor encapsulating strain are divided into axial and radial laying, cover one deck epoxy resin 6 again at isosceles triangle and neighborhood thereof, ensure that the fiber Bragg Grating Strain Sensor device of measurement dry-type air-core reactor strain and temperature compensation sensor 11 are closely pasted with bottom grid cloth 7; Connecting fiber 4 to be pasted on insulating gel 8 and along drawing from dry-type air-core reactor encapsulating 10; Meanwhile, measure dry-type air-core reactor strain fiber Bragg Grating Strain Sensor device and the ventiduct of temperature compensation sensor 11 between adjacent two air duct slats 9 in;
After Step4, sensor are laid, the grid cloth of clip and bottom grid cloth 7 equal size covers measure fiber Bragg Grating Strain Sensor device that dry-type air-core reactor strains and temperature compensation sensor 11 surperficial, overlap with bottom grid cloth 7, and gently press grid cloth 7 that itself and lower floor are binded completely with palm;
After Step5, above-mentioned work complete, encapsulate 10 surfaces at dry-type air-core reactor and be wound around 1 to 2 layer of glass fiber tape again, cover whole dry-type air-core reactor encapsulating 10 and sensor laying region;
After Step6, sensor have been imbedded, under dry-type air-core reactor duty, the fiber Bragg Grating Strain Sensor device of dry-type air-core reactor encapsulating strain and the wavelength variations situation of temperature compensation sensor 11 are measured in monitoring, obtain the shift value of the centre wavelength of optical fiber Bragg raster 3 according to the analysis of optical fiber Bragg raster (FBG) demodulator
;
Step7, the temperature value surveyed according to temperature compensation sensor 11, the wavelength shift that the fiber Bragg Grating Strain Sensor device optical fiber Bragg raster 3 calculating the strain of measurement dry-type air-core reactor causes because of temperature variation
, encapsulate 10 relational expressions strained with dry-type air-core reactor
calculate the strain variation that dry-type air-core reactor is axial and radial under solidification or duty;
gage factor in formula,
for the strain variation amount of test environment.
Described distance
lbe about 100mm.
The beneficial effects of the utility model are:
1, the utility model structure is simple.The strain measurement that tested dry-type air-core reactor is encapsulated is converted into the modulation to optical fiber Bragg raster wavelength, the linear relation of strain variation that optical fiber Bragg raster wavelength-shift and dry-type air-core reactor are encapsulated.
2, this strain transducer adopts optical fiber Bragg raster to do sensing element, electromagnetism interference, is applicable to the strain monitoring in strong-electromagnetic field environment.
3, polytetrafluoroethylmaterial material has that quality is light, Anti-pull-press ability strong and the advantage such as good endurance, not only plays the effect of protection optical fiber Bragg raster, and can transmit well by the strain variation of geodesic structure.
4, this sensor bulk very I to be embedded in dry-type air-core reactor encapsulating inner, do not affect the production technology of dry-type air-core reactor, and safe and reliable, reactor normally do not worked and have a negative impact.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation;
Fig. 2 is the front schematic view imbedded of strain transducer in the utility model.
Each label in figure: 1-polytetrafluoroethylmaterial material, 2-groove, 3-optical fiber Bragg raster, 4-optical fiber, 5-ferrule, 6-epoxy resin, 7-grid cloth, 8-insulating gel, 9-air duct slats, 10-dry-type air-core reactor is encapsulated, 11-temperature compensation sensor.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Embodiment 1: as shown in Figure 1-2, a kind of fiber Bragg Grating Strain Sensor device measuring dry-type air-core reactor encapsulating strain, comprises polytetrafluoroethylmaterial material 1, groove 2, optical fiber Bragg raster 3, optical fiber 4, ferrule 5, epoxy resin 6; Described polytetrafluoroethylmaterial material 1 is rectangular, having a groove 2 running through whole material plate body, burying optical fiber Bragg raster 3 for planting in the middle of polytetrafluoroethylmaterial material 1; Optical fiber Bragg raster 3 afterbody is connected with optical fiber 4, the optical fiber 4 of drawing passes from ferrule 5, ferrule 5 port inside scribbles epoxy resin 6 for being adhered fixed optical fiber 4, optical fiber Bragg raster 3 is placed on groove 2 centre position, with epoxy resin 6, optical fiber Bragg raster 3 and connecting fiber 4 thereof are encapsulated in bottom groove 2, make itself and polytetrafluoroethylmaterial material 1 be encapsulated into one.
Embodiment 2: as shown in Figure 1-2, a kind of fiber Bragg Grating Strain Sensor device measuring dry-type air-core reactor encapsulating strain, comprises polytetrafluoroethylmaterial material 1, groove 2, optical fiber Bragg raster 3, optical fiber 4, ferrule 5, epoxy resin 6; Described polytetrafluoroethylmaterial material 1 is rectangular, having a groove 2 running through whole material plate body, burying optical fiber Bragg raster 3 for planting in the middle of polytetrafluoroethylmaterial material 1; Optical fiber Bragg raster 3 afterbody is connected with optical fiber 4, the optical fiber 4 of drawing passes from ferrule 5, ferrule 5 port inside scribbles epoxy resin 6 for being adhered fixed optical fiber 4, optical fiber Bragg raster 3 is placed on groove 2 centre position, with epoxy resin 6, optical fiber Bragg raster 3 and connecting fiber 4 thereof are encapsulated in bottom groove 2, make itself and polytetrafluoroethylmaterial material 1 be encapsulated into one.
Its concrete use procedure is:
Step1, dry-type air-core reactor encapsulating 10 complete after, in the ventiduct between two air duct slats 9 that impregnation (epoxy resin) glass tape outside surface is adjacent, along laying grid cloth 7(200mm × 500mm from top to bottom from dry-type air-core reactor encapsulating 10); Require that grid cloth 7 is close to dry-type air-core reactor and is encapsulated 10 outside surfaces, and grid cloth 7 centre position vertical distribution is between adjacent two air duct slats 9;
Step2, grid cloth 7 apart under along about 100mm distance, bottom-up painting insulating gel 8 to grid cloth 7 upper end, area is about 150mm × 400mm;
After Step3, the fiber Bragg Grating Strain Sensor device 2 being measured dry-type air-core reactor encapsulating strain and 1 temperature compensation sensor 11 epoxy resin dipping 6, be about in 100mm distance areas the fiber Bragg Grating Strain Sensor device and temperature compensation sensor 11 laying and measure dry-type air-core reactor strain apart from grid cloth 7 lower end; 3 sensors are isosceles triangle arrangement, wherein 2 fiber Bragg Grating Strain Sensor devices measuring dry-type air-core reactor encapsulating strain are divided into axial and radial laying, cover one deck epoxy resin 6 again at isosceles triangle and neighborhood thereof, ensure that the fiber Bragg Grating Strain Sensor device of measurement dry-type air-core reactor strain and temperature compensation sensor 11 are closely pasted with bottom grid cloth 7; Connecting fiber 4 to be pasted on insulating gel 8 and along drawing from dry-type air-core reactor encapsulating 10; Meanwhile, measure dry-type air-core reactor strain fiber Bragg Grating Strain Sensor device and the ventiduct of temperature compensation sensor 11 between adjacent two air duct slats 9 in;
After Step4, sensor are laid, the grid cloth (200mm × 500mm) of clip and bottom grid cloth 7 equal size covers measure fiber Bragg Grating Strain Sensor device that dry-type air-core reactor strains and temperature compensation sensor 11 surperficial, overlap with bottom grid cloth 7, and gently press grid cloth that itself and lower floor are binded completely with palm;
After Step5, above-mentioned work complete, encapsulate 10 surfaces at dry-type air-core reactor and be wound around 1 to 2 layer of glass fiber tape again, cover whole encapsulating 10 and sensor laying region; When placing lower floor's air duct slats 9, keep the sensor imbedded between adjacent two air duct slats 9, avoid because excessive compression makes sensor degradation.
After Step6, sensor have been imbedded, under dry-type air-core reactor duty, the fiber Bragg Grating Strain Sensor device of dry-type air-core reactor encapsulating strain and the wavelength variations situation of temperature compensation sensor 11 are measured in monitoring, obtain the shift value of the centre wavelength of optical fiber Bragg raster 3 according to the analysis of optical fiber Bragg raster (FBG) demodulator
;
Step7, the temperature value surveyed according to temperature compensation sensor 11, the wavelength shift that the fiber Bragg Grating Strain Sensor device optical fiber Bragg raster 3 calculating the strain of measurement dry-type air-core reactor causes because of temperature variation
, encapsulate 10 relational expressions strained with dry-type air-core reactor
calculate the strain variation that dry-type air-core reactor is axial and radial under solidification or duty;
gage factor in formula,
for the strain variation amount of test environment.
The optical fiber of Step8, extraction is connected with (FBG) demodulator by wire jumper, obtains the Bragg wavelength of optical fiber Bragg raster;
Step9, the calculated results show, when the initial Bragg wavelength of optical fiber Bragg raster is
during=1526nm,
,
, the temperature sensitive coefficient of the fiber Bragg Grating Strain Sensor device of actual measurement dry-type air-core reactor strain of demarcating
=0.03162nm/ DEG C, gage factor
=0.001201nm/
;
Step9, sensitivity are: Bragg wavelength-shift-tested strain variation amount is the sensitivity of sensor is 1.2pm/
, namely strain generation 1
change time, the optical fiber Bragg raster Bragg wavelength-shift caused is 1.2pm;
Step10, (to refer to when the wavelength discrimination of optical fiber Bragg raster (FBG) demodulator is 1pm
when often changing 1pm), the strain resolving power of this sensor is 0.83
.
By reference to the accompanying drawings specific embodiment of the utility model is explained in detail above, but the utility model is not limited to above-described embodiment, in the ken that those of ordinary skill in the art possess, various change can also be made under the prerequisite not departing from the utility model aim.
Claims (1)
1. measure a fiber Bragg Grating Strain Sensor device for dry-type air-core reactor encapsulating strain, it is characterized in that: comprise polytetrafluoroethylmaterial material (1), groove (2), optical fiber Bragg raster (3), optical fiber (4), ferrule (5), epoxy resin (6); Described polytetrafluoroethylmaterial material (1) is rectangular, having a groove (2) running through whole material plate body, burying optical fiber Bragg raster (3) for planting in the middle of polytetrafluoroethylmaterial material (1); Optical fiber Bragg raster (3) afterbody is connected with optical fiber (4), the optical fiber (4) of drawing passes from ferrule (5), ferrule (5) port inside scribbles epoxy resin (6) for being adhered fixed optical fiber (4), optical fiber Bragg raster (3) is placed on groove (2) centre position, with epoxy resin (6), optical fiber Bragg raster (3) and connecting fiber (4) thereof are encapsulated in groove (2) bottom, make itself and polytetrafluoroethylmaterial material (1) be encapsulated into one.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520624610.9U CN204988203U (en) | 2015-08-19 | 2015-08-19 | Measure dry -type air -core reactor and seal optic fibre bragg bragg grating strain sensor who meets an emergency |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520624610.9U CN204988203U (en) | 2015-08-19 | 2015-08-19 | Measure dry -type air -core reactor and seal optic fibre bragg bragg grating strain sensor who meets an emergency |
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| Publication Number | Publication Date |
|---|---|
| CN204988203U true CN204988203U (en) | 2016-01-20 |
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|---|---|---|---|
| CN201520624610.9U Expired - Fee Related CN204988203U (en) | 2015-08-19 | 2015-08-19 | Measure dry -type air -core reactor and seal optic fibre bragg bragg grating strain sensor who meets an emergency |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204988203U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105115439A (en) * | 2015-08-19 | 2015-12-02 | 昆明理工大学 | Embedded fiber Bragg grating strain sensor for measuring strain of encapsulation of dry-type air-core reactor and method for using same |
| CN110631615A (en) * | 2019-08-23 | 2019-12-31 | 华东交通大学 | Method for verifying performance of nano-photonic sensor in contact net metal structure environment |
-
2015
- 2015-08-19 CN CN201520624610.9U patent/CN204988203U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105115439A (en) * | 2015-08-19 | 2015-12-02 | 昆明理工大学 | Embedded fiber Bragg grating strain sensor for measuring strain of encapsulation of dry-type air-core reactor and method for using same |
| CN110631615A (en) * | 2019-08-23 | 2019-12-31 | 华东交通大学 | Method for verifying performance of nano-photonic sensor in contact net metal structure environment |
| CN110631615B (en) * | 2019-08-23 | 2021-08-17 | 华东交通大学 | Method for verifying performance of nano-photonic sensor in contact net metal structure environment |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160120 Termination date: 20170819 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |