CN102564322A - System for monitoring sag of overhead wire in real time - Google Patents
System for monitoring sag of overhead wire in real time Download PDFInfo
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- CN102564322A CN102564322A CN2012100147882A CN201210014788A CN102564322A CN 102564322 A CN102564322 A CN 102564322A CN 2012100147882 A CN2012100147882 A CN 2012100147882A CN 201210014788 A CN201210014788 A CN 201210014788A CN 102564322 A CN102564322 A CN 102564322A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 40
- 239000013307 optical fiber Substances 0.000 claims abstract description 57
- 238000004458 analytical method Methods 0.000 claims abstract description 7
- 239000012212 insulator Substances 0.000 claims abstract description 7
- 239000000835 fiber Substances 0.000 claims description 24
- 230000003287 optical effect Effects 0.000 claims description 18
- 230000001681 protective effect Effects 0.000 claims description 10
- RRVPPYNAZJRZFR-VYOBOKEXSA-N 1-oleoyl-2-palmitoyl-sn-glycero-3-phosphocholine Chemical compound CCCCCCCCCCCCCCCC(=O)O[C@@H](COP([O-])(=O)OCC[N+](C)(C)C)COC(=O)CCCCCCC\C=C/CCCCCCCC RRVPPYNAZJRZFR-VYOBOKEXSA-N 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 239000002131 composite material Substances 0.000 abstract 1
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- 238000005259 measurement Methods 0.000 description 4
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- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004073 vulcanization Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
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Abstract
The invention relates to a system for monitoring the sag of an overhead wire in real time. The system comprises an optical fiber grating stress sensor, a communication optical fiber, an optical fiber grating demodulator and an analysis module, wherein the communication optical fiber is arranged in an optical fiber composite phase line of the overhead wire; the optical fiber grating stress sensor is arranged on the communication optical fiber, and is connected to the optical fiber grating demodulator through the communication optical fiber; and the optical fiber grating sensor is arranged in a strain connecting piece, and the strain connecting piece is arranged between a strain tower and an insulator string. The optical fiber grating stress sensor of the system can accurately measure the tensile force on the strain connecting piece, so that the accuracy for calculating the sag of the overhead wire is improved.
Description
Technical field
The present invention relates to the electric power monitoring field, particularly a kind of sag real-time monitoring system of pole line.
Background technology
Along with fast growth of national economy, China also sharply increases the demand of electric power, and as extremely important ingredient in the electrical network, the security of high-tension overhead line operation more and more receives the concern of Operation of Electric Systems.Wherein, the sag of high-tension overhead line is the leading indicator of line design and operation, and is most important for the security of operation of high-tension overhead line.Because the variation of circuit operating load; And the variation of environment around the atmospheric temperature, wind, wire icing etc.; The variation of line-sag is caused in the capital; And excessive sag not only can bring the hidden danger of security incident, has also limited the transport capacity of circuit, especially in scissors crossing and densely inhabited district.Therefore, tour and the detection to the high-tension overhead line sag just seems particularly important.But, along with the continuous growth of China's transmission line of electricity total length, all brought very big difficulty for tour and the maintenance etc. of circuit, even the manpower and materials of labor detect the transmission line of electricity situation under given conditions, also be difficult in time obtain or the feedback monitoring data.
In the last few years; Some newly-built power circuits have generally set up the OPPC optical cable; Because it has the optical-fibre channel of transmitting optical signal; Therefore fiber-optic grating sensor is installed is on the line just seemed unusual convenient, and pass through temperature and the strain index that fiber-optic grating sensor is surveyed circuit, this can monitor us in real time to the day-to-day operation of OPPC; To the round-the-clock monitoring of carrying out on the whole piece circuit, thereby can easy to doly know the situation of change of temperature, stress, sag and icing in the circuit operational process.
Summary of the invention
The object of the present invention is to provide a kind of pole line sag real-time monitoring system.Monitoring system of the present invention has solved the difficult problem that prior art is difficult to accurate measurement bay ceases to be busy suffered tension force, has improved the accuracy of calculating the sag of pole line.
In order to reach the foregoing invention purpose, technical scheme provided by the invention is following:
A kind of pole line sag real-time monitoring system; It is characterized in that; This system includes optical fiber optical grating stress sensor, telecommunication optical fiber, fiber Bragg grating (FBG) demodulator and analysis module; Described telecommunication optical fiber is arranged in the OPPC of pole line, and this telecommunication optical fiber is provided with optical fiber optical grating stress sensor, and described fiber-optic grating sensor is connected on the fiber Bragg grating (FBG) demodulator through telecommunication optical fiber; Described fiber-optic grating sensor places in the strain web member, and this strain web member is arranged between anchor support and the insulator chain.
In pole line sag real-time monitoring system of the present invention; Include wideband light source, fiber coupler, wavelength pick-up unit and display unit in the described fiber Bragg grating (FBG) demodulator; Described wideband light source connects fiber coupler; This fiber coupler also is connected with telecommunication optical fiber and wavelength pick-up unit, is provided with wavelength detection module and ess-strain modular converter in this wavelength pick-up unit, and the wavelength pick-up unit connects and transmits the ess-strain value to display unit.
In pole line sag real-time monitoring system of the present invention, also include the optical fiber grating temperature compensation sensor in the described monitoring system, this optical fiber grating temperature compensation sensor and optical fiber optical grating stress sensor in series are arranged on the described telecommunication optical fiber.
In pole line sag real-time monitoring system of the present invention; Described strain link includes strain beam and two hangers that are positioned at the strain beam both sides; The middle part of said strain beam is provided with stressed groove; Be provided with fixing rack for sensor on stressed groove side, set up described fiber-optic grating sensor on this fixing rack for sensor.
In pole line sag real-time monitoring system of the present invention, respectively be provided with a sheath shoulder at the link position place of described hangers and strain beam, be provided with between two sheath shoulders and be placed in the outside protective sleeve of strain beam.
In pole line sag real-time monitoring system of the present invention, be provided with the sheath hurdle in the outside of said sheath shoulder, the external diameter on this sheath hurdle is slightly larger than the external diameter of sheath shoulder and identical with the external diameter of said protective sleeve.
Based on technique scheme, pole line sag real-time monitoring system of the present invention has following technological merit aspect the calculating of solution pole line sag:
1. pole line real-time monitoring system of the present invention is designed a strain web member and is replaced traditional link, and the strain web member is connected between two U type links; Optical fiber optical grating stress sensor is fixed on the fixing rack for sensor of strain web member, is used to monitor pulling force suffered on the strain web member.
2. pole line sag real-time monitoring system of the present invention utilizes the light signal of optical fiber optical grating stress sensor and optical fiber grating temperature compensation sensor; Obtain suffered pulling force of stress web member and temperature; And utilize the analysis module that is built in the fiber Bragg grating (FBG) demodulator to calculate the sag of pole line; Have sag and calculate accurately and advantage fast, and can accomplish real-time monitoring.
Description of drawings
Fig. 1 is that the structure of pole line sag real-time monitoring system of the present invention connects synoptic diagram.
Fig. 2 be pole line with anchor support between be connected synoptic diagram.
Fig. 3 is that light path connects synoptic diagram in the real-time monitoring system of the present invention.
Fig. 4 is the structural representation of stress web member in the pole line sag real-time monitoring system of the present invention.
Embodiment
Below we combine accompanying drawing and concrete embodiment to come pole line sag real-time monitoring system of the present invention done further in detail to set forth; Form and principle of work in the hope of understand structure of the present invention more cheer and brightly, but can not limit protection scope of the present invention with this.
As shown in figures 1 and 3, pole line sag real-time monitoring system of the present invention structurally mainly includes optical fiber optical grating stress sensor 8, telecommunication optical fiber 7, fiber Bragg grating (FBG) demodulator 3 and analysis module.Wherein, Telecommunication optical fiber 7 is arranged in the OPPC of pole line 2; This telecommunication optical fiber 7 is provided with optical fiber optical grating stress sensor 8, and telecommunication optical fiber 7 connects fiber Bragg grating (FBG) demodulator 3, and fiber Bragg grating (FBG) demodulator 3 connects and imports data to analysis module; Fiber Bragg grating (FBG) demodulator 3 is positioned at the pulpit, and analysis module is arranged in the computer 14.Fiber-optic grating sensor 8 is connected on the fiber Bragg grating (FBG) demodulator 3 through telecommunication optical fiber, and telecommunication optical fiber plays the effect of signal conduction.And fiber-optic grating sensor 8 is arranged in the strain web member 4; This strain web member 4 is arranged between anchor support 1 and the insulator chain; Insulator chain then is arranged on the end that pole line 2 is connected with anchor support 1; Described strain web member 4 one ends are connected to the insulator chain on the pole line through the U-shaped link, and the other end connects anchor support through the U-shaped link.
As shown in Figure 2; The two ends of a pole line 2 are connected with anchor support 1 through two strain web members 4 respectively; Fiber-optic grating sensor through being arranged in the strain web member 4 predicts ess-strain; Calculate sag and variable condition in fact the time through the relation between ess-strain and the sag, thereby realize the real-time monitoring of the present invention the pole line sag.
Include wideband light source 5, fiber coupler 6, wavelength pick-up unit 18 and display unit 11 in the above-mentioned fiber Bragg grating (FBG) demodulator 3; Described wideband light source 5 connects fiber coupler 6; This fiber coupler 6 also is connected with telecommunication optical fiber 7 and wavelength pick-up unit 10; Be provided with wavelength detection module and ess-strain modular converter in this wavelength pick-up unit 10, the wavelength pick-up unit connects and carries the ess-strain value to display unit 11.Said structure is as shown in Figure 3.The fiber Bragg grating (FBG) demodulator 3 here is arranged in the pulpit, and connects a computer 14, the conversion of the ess-strain of realizing through computer module, and the display of computer 14 the insides is showed data as display unit 11 to user real time.Because pole line 1 length very, sometimes certainly will increasing to reduces adds a computer 15 and monitors in real time simultaneously.
In order to reject the harmful effect that temperature causes in measuring process, in monitoring system, also include optical fiber grating temperature compensation sensor 9, this optical fiber grating temperature compensation sensor 9 in series is arranged on the described telecommunication optical fiber 7 with optical fiber optical grating stress sensor 8.Corresponding to above-mentioned optical fiber grating temperature compensation sensor 8, we also are provided with the temperature transition module in wavelength pick-up unit 10.The effect of this temperature transition module is that the Wavelength demodulation of temperature to this position fiber-optic grating sensor gone out, and the more suffered total wavelength of optical fiber optical grating stress sensor is removed the wavelength variable quantity that is produced by temperature variation, promptly gets the dependent variable that STRESS VARIATION produces.Optical fiber grating temperature compensation sensor 9 all is placed in the strain web member 4 with optical fiber optical grating stress sensor 8.
In pole line sag real-time monitoring system of the present invention, as shown in Figure 4, described strain link 4 includes strain beam 41 and two hangers 42 that are positioned at strain beam 41 both sides.Be provided with stressed groove 43 at the middle part of strain beam 41, stressed groove is in long-pending minimum position, whole strain web member 4 middle sections, thus when strain web member 4 is stretched the stressed maximum of unit area here.Owing to change the whole sectional area of the depth-adjustment of this stressed groove, thereby adjust stressed size, and then adjust whole sensing unit sensitivity.Be provided with fixing rack for sensor 44 on stressed groove 43 sides, set up described fiber-optic grating sensor on this fixing rack for sensor 44, the fiber-optic grating sensor here can include optical fiber optical grating stress sensor and optical fiber grating temperature compensation sensor.In order to protect fiber-optic grating sensor; Avoid extraneous factor that measurement is caused harmful effect; Protecting to guarantee the correct use of fiber-optic grating sensor, must fiber-optic grating sensor be wrapped up, generally is to adopt columnar protective sleeve to protect.In order on strain link 4, protective sleeve to be installed, we respectively are provided with between 45, two sheath shoulders 45 of a sheath shoulder at the link position place of hangers 42 and strain beam 41 and are provided with the protective sleeve that is placed in strain beam 41 outsides.Be moved to both sides in order to place protective sleeve; We are provided with sheath hurdle 46 in the outside of sheath shoulder 45; The external diameter on this sheath hurdle 46 is slightly larger than the external diameter of sheath shoulder 45 and identical with the external diameter of said protective sleeve, can guarantee that like this protective sleeve is fixed on certain interval and is unlikely to slide and expose fiber-optic grating sensor to both sides.
Core of the present invention is the measurement that is provided with ess-strain, utilizes the relation between ess-strain and the sag to reach the purpose of measuring sag.The principle derivation of its measurement is following:
1, the relation between strain and the sag
1). lead is than carrying relevant derivation with stress
Can know that by shelves inside conductor horizontal direction dynamic balance condition lead each point place stress level component size equates:
F·cosθ=σS (1)
The maximum sag calculating formula of lead is:
f=(l/4)(tanθ
A+h/l) (2)
Or f=(l/4) (tan θ
B+ h/l) (3)
To there be icing lead suspension point inclination angle theta
A0Or θ
A0, span l, suspension point discrepancy in elevation h, the above formula of no icing lead cross-sectional area S0 substitution must not have the maximum sag f of icing lead
0, minimum point horizontal stress σ
0
Do not wait the maximum sag catenary suspension type continuous vulcanization of high lead equation by suspension point again:
f=lg
2/8σcosφ （4）
Find the solution no icing lead than carrying g
0
In like manner find the solution the maximum sag f of ice coating wire
1Substitution (4) formula must compare the ratio g that carries with the minimum point horizontal stress by ice coating wire
1/ σ
1, be designated as H, in like manner, no icing lead g
0/ σ
0Be designated as H
0, the following algorithm of equivalent substitution is derived.
2). find the solution actual line length of lead and equivalent line length
The equivalent span of isolated shelves is:
According to actual line length catenary suspension type continuous vulcanization equation in the lead shelves:
（6）
Get equivalent line length catenary suspension type continuous vulcanization equation:
（7）
(6), (7) two formulas are transformed to respectively through H equivalence substitution:
Find the solution no icing lead line length L
0, ice coating wire line length L and equivalent line length L '.
Tie point stress between anchor support that the sag monitoring system monitors and insulator chain; The real-time communications optical cable that passes through is transferred in the fiber Bragg grating (FBG) demodulator that is positioned in the pulpit; Fiber Bragg grating (FBG) demodulator can be calculated taseometer here; According to the aforementioned calculation formula, the sag data of this sag meter of dynamic calculation one section lead of being monitored simultaneously.These data are compared with the institute predetermined threshold value, then trigger warning if surpass threshold value.Like this, warning that can be when in above-mentioned monitoring system, increasing warning device and realize that sag surpasses dangerous values so that take measures to realize the real-time monitoring of pole line sag, is guaranteed the safety that electric power is carried.Optical fiber optical grating stress sensor of the present invention can accurately be measured the suffered tension force of strain web member between two U type links, has improved the accuracy of calculating the sag of pole line.
Undoubtedly, pole line sag real-time monitoring system of the present invention also comprises other versions and connected mode except said structure is described, be not limited to the foregoing description.Generally speaking, protection content of the present invention also comprises other conspicuous to those skilled in the art conversion and substitutes.
Claims (7)
1. pole line sag real-time monitoring system; It is characterized in that; This system includes optical fiber optical grating stress sensor, telecommunication optical fiber, fiber Bragg grating (FBG) demodulator and analysis module; Described telecommunication optical fiber is arranged in the OPPC of pole line, and this telecommunication optical fiber is provided with optical fiber optical grating stress sensor, and described fiber-optic grating sensor is connected on the fiber Bragg grating (FBG) demodulator through telecommunication optical fiber; Described fiber-optic grating sensor places in the strain web member, and this strain web member is arranged between anchor support and the insulator chain.
2. a kind of pole line sag real-time monitoring system according to claim 1; It is characterized in that; Include wideband light source, fiber coupler, wavelength pick-up unit and display unit in the described fiber Bragg grating (FBG) demodulator; Described wideband light source connects fiber coupler; This fiber coupler also is connected with telecommunication optical fiber and wavelength pick-up unit, is provided with wavelength detection module and ess-strain modular converter in this wavelength pick-up unit, and the wavelength pick-up unit connects and transmits the ess-strain value to display unit.
3. a kind of pole line sag real-time monitoring system according to claim 1; It is characterized in that; Also include the optical fiber grating temperature compensation sensor in the described monitoring system, this optical fiber grating temperature compensation sensor and optical fiber optical grating stress sensor in series are arranged on the described telecommunication optical fiber.
4. a kind of pole line sag real-time monitoring system according to claim 1; It is characterized in that; Described strain link includes strain beam and two hangers that are positioned at the strain beam both sides; The middle part of said strain beam is provided with stressed groove, is provided with fixing rack for sensor on stressed groove side, sets up described fiber-optic grating sensor on this fixing rack for sensor.
5. a kind of pole line sag real-time monitoring system according to claim 4 is characterized in that, respectively is provided with a sheath shoulder at the link position place of described hangers and strain beam, is provided with between two sheath shoulders and is placed in the outside protective sleeve of strain beam.
6. a kind of pole line sag real-time monitoring system according to claim 5 is characterized in that, is provided with the sheath hurdle in the outside of said sheath shoulder, and the external diameter on this sheath hurdle is slightly larger than the external diameter of sheath shoulder and identical with the external diameter of said protective sleeve.
7. a kind of pole line sag real-time monitoring system according to claim 2 is characterized in that, the warning device in addition that described fiber Bragg grating (FBG) demodulator connects.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944341A (en) * | 2012-11-14 | 2013-02-27 | 中天日立光缆有限公司 | Transmission line fiber grating stress sensor |
| CN103822737A (en) * | 2013-11-30 | 2014-05-28 | 国家电网公司 | Optical fiber bragg grating transmission line on-line monitoring device and method |
| CN104390731A (en) * | 2014-12-17 | 2015-03-04 | 云南电网有限责任公司昆明供电局 | Lever block load monitoring and alarming device |
| CN106017541A (en) * | 2016-07-29 | 2016-10-12 | 中铁第四勘察设计院集团有限公司 | Online monitoring device and method of subway contact net support looseness |
| CN107328498A (en) * | 2017-08-11 | 2017-11-07 | 安徽天光传感器有限公司 | A kind of link sensor of pole structure |
| CN110207847A (en) * | 2019-06-27 | 2019-09-06 | 西安柯莱特信息科技有限公司 | A kind of temperature detection structure |
| CN110426013A (en) * | 2019-07-25 | 2019-11-08 | 国网河北省电力有限公司衡水供电分公司 | A kind of LED conducting wire sag observation device |
| CN115207856A (en) * | 2022-08-01 | 2022-10-18 | 福州德寰流体技术有限公司 | Overhead line on-line real-time monitoring, early warning and disconnection protection device |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944341A (en) * | 2012-11-14 | 2013-02-27 | 中天日立光缆有限公司 | Transmission line fiber grating stress sensor |
| CN102944341B (en) * | 2012-11-14 | 2014-12-17 | 中天日立光缆有限公司 | Transmission line fiber grating stress sensor |
| CN103822737A (en) * | 2013-11-30 | 2014-05-28 | 国家电网公司 | Optical fiber bragg grating transmission line on-line monitoring device and method |
| CN103822737B (en) * | 2013-11-30 | 2018-07-10 | 国家电网公司 | A kind of Monitoring-fiber Bragg Grating on-line monitoring device for transmission line and method |
| CN104390731A (en) * | 2014-12-17 | 2015-03-04 | 云南电网有限责任公司昆明供电局 | Lever block load monitoring and alarming device |
| CN106017541A (en) * | 2016-07-29 | 2016-10-12 | 中铁第四勘察设计院集团有限公司 | Online monitoring device and method of subway contact net support looseness |
| CN107328498A (en) * | 2017-08-11 | 2017-11-07 | 安徽天光传感器有限公司 | A kind of link sensor of pole structure |
| CN110207847A (en) * | 2019-06-27 | 2019-09-06 | 西安柯莱特信息科技有限公司 | A kind of temperature detection structure |
| CN110207847B (en) * | 2019-06-27 | 2020-11-24 | 湖北省建筑材料节能检测中心有限公司 | Temperature detection structure |
| CN110426013A (en) * | 2019-07-25 | 2019-11-08 | 国网河北省电力有限公司衡水供电分公司 | A kind of LED conducting wire sag observation device |
| CN115207856A (en) * | 2022-08-01 | 2022-10-18 | 福州德寰流体技术有限公司 | Overhead line on-line real-time monitoring, early warning and disconnection protection device |
| CN115207856B (en) * | 2022-08-01 | 2023-03-10 | 福州德寰流体技术有限公司 | Overhead line on-line real-time monitoring, early warning and disconnection protection device |
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