CN202372276U - Fiber Bragg grating temperature monitoring device of high-voltage power cable central joint - Google Patents
Fiber Bragg grating temperature monitoring device of high-voltage power cable central joint Download PDFInfo
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- CN202372276U CN202372276U CN2011202636206U CN201120263620U CN202372276U CN 202372276 U CN202372276 U CN 202372276U CN 2011202636206 U CN2011202636206 U CN 2011202636206U CN 201120263620 U CN201120263620 U CN 201120263620U CN 202372276 U CN202372276 U CN 202372276U
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- bragg grating
- pipe
- fiber
- power cable
- capillary brass
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 9
- 239000004642 Polyimide Substances 0.000 claims abstract description 18
- 229920001721 polyimide Polymers 0.000 claims abstract description 18
- 229910001369 Brass Inorganic materials 0.000 claims description 39
- 239000010951 brass Substances 0.000 claims description 39
- 239000013307 optical fiber Substances 0.000 claims description 25
- 230000035945 sensitivity Effects 0.000 claims description 7
- JOHZPMXAZQZXHR-UHFFFAOYSA-N pipemidic acid Chemical compound N1=C2N(CC)C=C(C(O)=O)C(=O)C2=CN=C1N1CCNCC1 JOHZPMXAZQZXHR-UHFFFAOYSA-N 0.000 claims description 4
- 238000005538 encapsulation Methods 0.000 claims description 3
- 239000000835 fiber Substances 0.000 abstract description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 11
- 239000010949 copper Substances 0.000 abstract description 11
- 229910052802 copper Inorganic materials 0.000 abstract description 11
- 238000004806 packaging method and process Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 230000035882 stress Effects 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000009529 body temperature measurement Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 210000004204 blood vessel Anatomy 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The utility model relates to a fiber Bragg grating temperature monitoring device of a high-voltage power cable central joint. The fiber Bragg grating temperature monitoring device comprises three fiber Bragg grating temperature sensors. The fiber Bragg grating temperature monitoring device is characterized in that the three fiber Bragg grating temperature sensors comprise a first capillary copper pipe (1), a second Bragg grating (2), a second capillary copper pipe (3), a fourth Bragg grating (4), a fifth capillary copper pipe (5), a sixth Bragg grating (6), a polyimides sleeve pipe (7) and a fiber (8); the second Bragg grating (2), the fourth Bragg grating (4) and the sixth Bragg grating (6) are written onto the fiber (8), and the three Bragg gratings are tightly packaged respectively by the first capillary copper pipe (1), the second capillary copper pipe (3) and the fifth capillary copper pipe (5); the fiber (8) is sleeved by the polyimides sleeve pipe (7) for protection; and when the polyimides sleeve pipe is contacted with the capillary copper pipes, the polyimides sleeve pipe is required to be tightly sleeved inside the capillary copper pipes to form a whole body so that seamless packaging is realized.
Description
Technical field
The utility model relates to a kind of optical fiber Bragg grating sensor responsive to temperature variation, particularly to the temperature measurement technology of high-tension cable intermediate head.Belong to the photoelectron field of measuring technique.
Background technology
Power cable has become one of blood vessel that transmits electric power, and the high voltage power cable intermediate head is the weak link in the power cable system, breaks down easily.The heat that produces because of reasons such as the high contact resistance of power cable intermediate head, large load current, shelf depreciation accumulation constantly raises the temperature of cable splice; Aging, the earial drainage current step of accelerating cable insulation material increase, and arrive to a certain degree to cause taking place to puncture or fire.This is the process of quantitative change to qualitative change, so Power Cable Joint Temperature is the important parameter of its running status of reflection.It mainly is that conductor connects and the screen layer incision position that the high-pressure cross-linking cable intermediate head is broken down; The peripherad insulating material generation in trouble spot heat transferred; Local temperature is raise, therefore can diagnose the internal fault of power cable intermediate head through the temperature rise that detects its material around.Temperature to the power cable intermediate head is carried out field monitoring, to realizing the safe operation of electric system, and then economic development, social stability is all had important meaning.
CN 101319938A discloses " the temperature measurement on-line method and the device thereof of cable joint of high-voltage plant ".In this prospectus, adopt temperature sensor and circuit board all to be sealed in the insulator; Implement comparatively difficulty, destroy the integrality of major insulation, constitute potential safety hazard; And adopt the mode of wireless receiving and dispatching to transmit data; Because the high-intensity magnetic field that power cable connector is inner, the data of transmission can receive the interference of high-intensity magnetic field, cause measuring error.
The utility model content
The purpose of the utility model is to overcome the deficiency of prior art, and a kind of device that utilizes Fiber Bragg Grating Temperature sensor monitors high voltage power cable Joint Temperature is provided.
The Fiber Bragg Grating Temperature monitoring device of the utility model high voltage power cable intermediate head comprises three Fiber Bragg Grating Temperature sensors; It is characterized in that; Said three Fiber Bragg Grating Temperature sensors comprise first capillary brass pipe (1) and the 2nd Bragg grating (2), the 3rd capillary brass pipe (3) and the 4th Bragg grating (4), the 5th capillary brass pipe (5) and the 6th Bragg grating (6); Polyimide sleeve pipe (7), optical fiber (8); On optical fiber (8), write said the 2nd Bragg grating (2), the 4th Bragg grating (4), the 6th Bragg grating (6) also with first capillary brass pipe (1), the 3rd capillary brass pipe (3), three Bragg gratings of the 5th capillary brass pipe (5) the corresponding compact package of difference; Adopt polyimide sleeve pipe (7) to entangle optical fiber (8), shield, when polyimide sleeve pipe and capillary brass pipe contact, require the polyimide sleeve pipe tightly to be enclosed within the capillary brass pipe, realize seamless encapsulation, become one.
Adopt the bigger capillary brass pipe compact package Bragg grating of thermal expansivity; Improve the sensitivity of fiber-optic grating sensor; Distance between three sensors approximates the distance of the connecting pipe mid point of high voltage power cable intermediate head to the stress cone mid point; Its error range guarantees that three sensors can detect the high voltage power cable intermediate head temperature a little that often breaks down within ± 5mm.
The utility model adopts the bigger capillary brass pipe compact package Bragg grating of thermal expansivity; Improve the sensitivity of fiber-optic grating sensor; Distance between three sensors approximates connecting pipe mid point in the high voltage power cable intermediate head to the distance of stress cone mid point; Its error range guarantees that three sensors can detect the high voltage power cable intermediate head temperature a little that often breaks down within ± 5mm.
The mathematical model of the utility model technology is following:
If in the measuring process temperature variation Δ T, because of the thermo-optic effect of grating, the wavelength-shift amount Δ λ of the optical fiber Bragg raster that promptly causes by temperature itself
B1, the reflection wavelength displacement that causes is:
ξ is the thermo-optical coeffecient of optical fiber Bragg raster in (1) formula, and α is the optical fiber thermal expansivity.
If in the measuring process temperature variation Δ T, because of capillary brass pipe and optical fiber Bragg raster, both thermal expansions asynchronous and cause the Bragg grating is produced strain, the strain that optical fiber Bragg raster produces in the axial direction is:
ε
T＝(α
S-α)·ΔT (2)
ε in (2) formula of going up
TBe that capillary brass pipe causes evenly axial strain of optical fiber Bragg raster, α because of thermal expansion
sThe thermal expansivity of expression capillary brass pipe.
Promptly in measuring process temperature variation Δ T, by the wavelength-shift amount Δ λ of the asynchronous optical fiber Bragg raster that causes of thermal expansion
B2, the reflection wavelength displacement that causes is:
Δλ
B2＝λ
B(1-P
e)ε
T (3)
In sum by the asynchronous displacement that all causes reflection wavelength of thermo-optic effect, capillary brass pipe and the optical fiber thermal expansion of grating, the reflection wavelength of sensor change and temperature variation between relation table be shown:
Compare with prior art, the beneficial effect of the utility model sensor is:
1, adopts the temperature of optical fiber Bragg grating sensor monitoring high voltage power cable intermediate head, avoided the conditional electronic metering system to disturb because of the measurement that high-intensity magnetic field causes.
2, can monitor the temperature of high voltage power cable intermediate head, reduce the measuring error of the sensor of traditional cluster or adhesive type because of generations such as ambient temperature, cross-ventilations.After adopting the capillary brass pipe packing forms of high thermal expansion coefficient, the sensitivity of optical fiber Bragg grating sensor improves greatly.
3, the monitoring power cable joint variation of temperature trend of point (conductor connect and two stress cone positions) that often breaks down; The trouble spot is transmitted to capillary brass pipe and fiber grating by the heat that different reasons produce; Finally make the skew of reflection wavelength peak value of the optical fiber Bragg raster of fiber grating; Realized real-time online measuring, can in time understand the ruuning situation of power cable intermediate head Power Cable Joint Temperature.
Description of drawings
Fig. 1 is the utility model basic structure synoptic diagram.
Fig. 2 is the arrangenent diagram that the utility model is used for the monitoring power cable joint.
Embodiment
Below through embodiment and combine accompanying drawing that the utility model is further specified.
Like Fig. 1, shown in 2,1 is first capillary brass pipe among the figure, and 2 is the 2nd Bragg grating, and 3 is the 3rd capillary brass pipe; 4 is the 4th Bragg grating, and 5 is the 5th capillary brass pipe, and 6 is the 6th Bragg grating, and 7 is the polyimide sleeve pipe; 8 is optical fiber, and 9 is the copper containment vessel, and 10 is the copper containment vessel, and 11 for filling glue.
The Fiber Bragg Grating Temperature monitoring device of the utility model high voltage power cable intermediate head comprises three Fiber Bragg Grating Temperature sensors; Said three Fiber Bragg Grating Temperature sensors comprise first capillary brass pipe 1 and the 2nd Bragg grating 2, the 3rd capillary brass pipe 3 and the 4th Bragg grating 4, the 5th capillary brass pipe 5 and the 6th Bragg grating 6; Polyimide sleeve pipe 7, optical fiber 8; On optical fiber 8, write said the 2nd Bragg grating 2, the 4th Bragg grating 4, the 6th Bragg grating 6 and distinguish three Bragg gratings of corresponding compact package with first capillary brass pipe 1, the 3rd capillary brass pipe 3, the 5th capillary brass pipe 5; Adopt polyimide sleeve pipe 7 to entangle optical fiber 8, shield, when polyimide sleeve pipe and capillary brass pipe contact, require the polyimide sleeve pipe tightly to be enclosed within the capillary brass pipe, realize seamless encapsulation, become one.
Adopt the bigger capillary brass pipe compact package Bragg grating of thermal expansivity, improve the sensitivity of fiber-optic grating sensor.Distance between the sensor approximates connecting pipe mid point in the high voltage power cable intermediate head to the distance of stress cone mid point; Its error range guarantees that three sensors can detect the high voltage power cable intermediate head temperature a little that often breaks down within ± 5mm.
In actual application, the utility model carries out according to following step.
1, according to high-voltgae pothead as requested and installation steps, two cable ends are handled.After accomplishing the installing and fixing of copper containment vessel 9, sensor installation as shown in Figure 1.
2, after sensor is installed successfully, accomplish processing to cable splice according to requirement, the step of high-voltage cable joint.
3, the technical parameter of optical fiber Bragg raster is: central wavelength lambda
B=1550.000nm, valid round-spectrum is counted P
e=0.22.
4, the capillary brass pipe parameter is: length L=20nm, external diameter R=4mm, internal diameter r=2mm.
5, the parameter of polyimide sleeve pipe is: external diameter R=1.3mm, internal diameter r=0.5mm.
6, obtain the Bragg crest value of optical fiber Bragg raster reflection with the fiber grating analyser;
7, the thermalexpansioncoefficient of the thermo-optical coeffecient ξ of fiber grating, fiber grating, capillary brass pipe thermalexpansioncoefficient
s, valid round-spectrum counts P
e=0.22 substitution (4) formula, sensitivity that can calculating sensor.Theoretical Calculation shows sensitivity 36.27pm/ ℃.When the wavelength resolution of optical fiber Bragg raster (FBG) demodulator was 1pm, the stress resolution of this sensor was 0.027 ℃.
Claims (2)
1. the Fiber Bragg Grating Temperature monitoring device of a high voltage power cable intermediate head; Comprise three Fiber Bragg Grating Temperature sensors; It is characterized in that; Said three Fiber Bragg Grating Temperature sensors comprise first capillary brass pipe (1) and the 2nd Bragg grating (2), the 3rd capillary brass pipe (3) and the 4th Bragg grating (4), the 5th capillary brass pipe (5) and the 6th Bragg grating (6), polyimide sleeve pipe (7), optical fiber (8); On optical fiber (8), write said the 2nd Bragg grating (2), the 4th Bragg grating (4), the 6th Bragg grating (6) also with first capillary brass pipe (1), the 3rd capillary brass pipe (3), three Bragg gratings of the 5th capillary brass pipe (5) the corresponding compact package of difference; Adopt polyimide sleeve pipe (7) to entangle optical fiber (8), shield, when polyimide sleeve pipe and capillary brass pipe contact, require the polyimide sleeve pipe tightly to be enclosed within the capillary brass pipe, realize seamless encapsulation, become one.
2. the Fiber Bragg Grating Temperature monitoring device of high voltage power cable intermediate head according to claim 1; It is characterized in that; Adopt the bigger capillary brass pipe compact package Bragg grating of thermal expansivity; Improve the sensitivity of fiber-optic grating sensor; Distance between three sensors approximates the distance of the connecting pipe mid point of high voltage power cable intermediate head to the stress cone mid point, and its error range guarantees that three sensors can detect the high voltage power cable intermediate head temperature a little that often breaks down within ± 5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202636206U CN202372276U (en) | 2011-07-25 | 2011-07-25 | Fiber Bragg grating temperature monitoring device of high-voltage power cable central joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202636206U CN202372276U (en) | 2011-07-25 | 2011-07-25 | Fiber Bragg grating temperature monitoring device of high-voltage power cable central joint |
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| Publication Number | Publication Date |
|---|---|
| CN202372276U true CN202372276U (en) | 2012-08-08 |
Family
ID=46595973
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202636206U Expired - Fee Related CN202372276U (en) | 2011-07-25 | 2011-07-25 | Fiber Bragg grating temperature monitoring device of high-voltage power cable central joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202372276U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109791060A (en) * | 2016-09-20 | 2019-05-21 | 福斯4X股份有限公司 | For carrying out the method and apparatus and computer program product of functional test to fibre optical sensor |
| CN113932946A (en) * | 2021-10-08 | 2022-01-14 | 江苏依卡维电子科技有限公司 | Overheat state electronic monitoring system of high-voltage cable connector |
-
2011
- 2011-07-25 CN CN2011202636206U patent/CN202372276U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109791060A (en) * | 2016-09-20 | 2019-05-21 | 福斯4X股份有限公司 | For carrying out the method and apparatus and computer program product of functional test to fibre optical sensor |
| CN113932946A (en) * | 2021-10-08 | 2022-01-14 | 江苏依卡维电子科技有限公司 | Overheat state electronic monitoring system of high-voltage cable connector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120808 Termination date: 20130725 |