CN103323140A - Method utilizing optical fiber composite overhead ground wire redundant cable to solve cross sensitivity existing in optical fiber Brillouin scattering monitoring - Google Patents
Method utilizing optical fiber composite overhead ground wire redundant cable to solve cross sensitivity existing in optical fiber Brillouin scattering monitoring Download PDFInfo
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- CN103323140A CN103323140A CN2013102017036A CN201310201703A CN103323140A CN 103323140 A CN103323140 A CN 103323140A CN 2013102017036 A CN2013102017036 A CN 2013102017036A CN 201310201703 A CN201310201703 A CN 201310201703A CN 103323140 A CN103323140 A CN 103323140A
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Abstract
The invention provides a method utilizing an OPGW redundant cable to solve cross sensitivity existing in optical fiber Brillouin scattering monitoring, and belongs to the technical field of photoelectronic measurement. An optical fiber Brillouin scattering demodulation analyzer is connected with the optical fiber core of an OPGW. Only temperature changes can cause the Brillouin scattering frequency shift of the OPGW redundant cable on an electric power iron tower, and ice accretion, wind blowing and other external stress factors cannot cause the Brillouin scattering frequency shift. Temperature compensation is carried out on a Brillouin scattering monitor technology through the OPGW redundant cable, the temperature and strain information of the overhead OPGW is demodulated out, the running state of the OPGW is reflected through the temperature and strain information of the OPGW, and the failure point of the OPGW is located through a Brillouin scattering sensor technology. The temperature complementation is carried out by utilizing the OPGW redundant cable on the electric power iron tower, the temperature and the strain along the OPGW are monitored, and the on-line monitor of the running state of the OPGW can be achieved.
Description
Technical field
The present invention relates to a kind of OPGW(Optical of utilization Fiber Composite Overhead Ground Wire), (Optical Fiber composite overhead Ground Wire) surplus cable solves the method for the cross sensitivity of optical fiber Brillouin scattering monitoring existence, belongs to the photoelectron field of measuring technique.
Background technology
OPGW is placed on optical fiber in the ground wire of high voltage overhead line, in order to constitute the fiber optic communication network on the transmission line of electricity, this version has transmission of electricity and the dual-use function of communicating by letter concurrently, in recent years, OPGW is annual to be laid more than 2000 kilometers, is an important development direction of electric power special optical cable.The running status of OPGW is directly connected to the safety of high pressure overhead power line itself and communication system of power grids system, and because of icing, aeolian vibration, wave, the disconnected burst phenomenon of OPGW that reasons such as thunderbolt, short circuit cause happens occasionally, safe and stable operation to transmission line of electricity and communication system constitutes greatly threat, therefore, it is significant OPGW to be carried out on-line monitoring.At present less to the research of OPGW status monitoring, mainly adopt traditional electronic sensor to monitor, this method exists inevitably and is subject to that strong-electromagnetic field disturbs, measuring accuracy is low and problem such as insulating property difference; And can cause generation and the difficult accurate location of realizing the trouble spot of omission accident easily at the limited amount of the OPGW sensor of arranging along the line; In addition, because the existence of electronic sensor power issue, this kind technology can not realize full operating mode on-line monitoring, causes great transmission of electricity or communication accident because of omission easily.
The Brillouin scattering sensing technology is a kind of novel light frequency modulation sensing technology, it can realize distributed measurement to optical fiber temperature and strain along the line, and have the measurement point positioning function, this technology has multinomial advantages such as accuracy of detection height, accurate positioning, distributed measurement.The main Brillouin scattering sensing technology of using has BOTDA(Brillouin Optical Time Domain Analysis at present, Brillouin optical time domain analysis) and BOTDR(Brillouin Optical Time Domain Reflectometry, the Brillouin light Time Domain Reflectometry) two kinds of monitoring technology, wherein: BOTDR is single-ended metering system, what survey is faint spontaneous brillouin scattering light, and signal demodulating system is had high requirement; BOTDA adopts the double-end measurement mode, detection be stronger stimulated Brillouin scattering light, have higher monitoring distance and monitoring accuracy.
The Brillouin scattering sensing technology can directly carry out the OPGW status monitoring with the optical fiber in the OPGW, and is simple to operate, monitoring accuracy is high, and can realize localization of fault.But there is the cross sensitivity problem of temperature and strain in this technology, causes the application development of this technology in the OPGW status monitoring slow.Someone proposes to adopt the corresponding relation of Brillouin scattering light intensity and temperature to carry out temperature compensation, but is limited by problems such as light intensity signal is weak, noise is big, the signal demodulation techniques are immature, and the present feasibility of this kind scheme is not high; Other has the scheme that adopts the Raman scattering sensing technology to carry out temperature compensation, because the monitoring distance of Raman scattering is short, cause the monitoring distance of this scheme can't satisfy the monitoring distance requirement of ultra-high-tension power transmission line, also can't realize using the Brillouin scattering sensing technology that the state of OPGW is monitored.
Summary of the invention
The object of the invention is to solve temperature when adopting optical fiber Brillouin scattering sensing technology that OPGW is carried out status monitoring and the cross sensitivity problem of strain.
The object of the present invention is achieved like this: optical fiber Brillouin scattering demodulation analyser links to each other with the fiber core of OPGW.Utilize the surplus cable of OPGW on the electric power tower to carry out temperature compensation, to solve temperature and the strain cross sensitivity problem of existing fiber Brillouin scattering sensing technology, thereby the temperature that OPGW is along the line and strain information carry out demodulation, reflect the running status of OPGW by the monitoring to OPGW temperature along the line and two parameters of strain.Its technical scheme is:
A kind of method of utilizing the surplus cable of Optical Fiber composite overhead Ground Wire to solve the cross sensitivity of optical fiber Brillouin scattering monitoring existence, optical fiber Brillouin scattering demodulation analyser of the present invention links to each other with fiber core in the Optical Fiber composite overhead Ground Wire, carry out temperature compensation by the surplus cable of Optical Fiber composite overhead Ground Wire on electric power tower, solve the temperature of existing fiber Brillouin scattering sensing technology and the cross sensitivity of strain, realization to Optical Fiber composite overhead Ground Wire temperature and strain along the line carry out on-line monitoring, by the monitoring temperature of Optical Fiber composite overhead Ground Wire and the running status that two parameters of strain reflect Optical Fiber composite overhead Ground Wire.
The present invention is provided with the Optical Fiber composite overhead Ground Wire splice tray at part angle tower or the anchor support of transmission line of electricity, the splice tray place is provided with one section Optical Fiber composite overhead Ground Wire optical cable, this section optical cable is fixed on the electric power tower, when using the Brillouin scattering sensing technology that Optical Fiber composite overhead Ground Wire is monitored, have only temperature variation can cause Brillouin frequency shifts, icing, wind equal stress factor can not cause the Brillouin frequencies drift, with the surplus cable of this section Optical Fiber composite overhead Ground Wire optical cable called after Optical Fiber composite overhead Ground Wire.
The present invention is when adopting the Brillouin scattering sensing technology that the Optical Fiber composite overhead Ground Wire state is monitored, the surplus cable of Optical Fiber composite overhead Ground Wire on an electric power tower temperature influence, be used for the temperature compensation of built on stilts Optical Fiber composite overhead Ground Wire monitoring result, demodulate temperature and two parameters of strain of built on stilts Optical Fiber composite overhead Ground Wire.
The present invention uses the Brillouin scattering sensing technology that the monitoring of Optical Fiber composite overhead Ground Wire temperature along the line and two parameters of strain is reflected the running status of Optical Fiber composite overhead Ground Wire, and with the Brillouin scattering sensing technology accident point on the Optical Fiber composite overhead Ground Wire is accurately located.
The principle that the present invention utilizes optical fiber Brillouin scattering sensing technology to carry out the OPGW status monitoring is: when using optical fiber Brillouin scattering demodulation analyser that OPGW is carried out status monitoring, when the temperature on the OPGW or strain change, the frequency of the detected Brillouin scattering of optical fiber Brillouin scattering demodulation analyser will relatively move, and the variable quantity of temperature and strain is all linear with the frequency shifts amount of Brillouin scattering.For the surplus cable of the OPGW on the electric power tower, because it is in stationary state at electric power tower, external force factor such as icing, wind can not cause strain variation to it, namely when using optical fiber Brillouin scattering sensing technology that the OPGW on the electric power tower is monitored, can cause that the factor that the Brillouin scattering occurrence frequency moves can only be variation of temperature, namely
δf
1=a
1·δT
（1）
In the formula (1), δ f
1Be the frequency displacement of the Brillouin scattering of OPGW tail optical fiber on the electric power tower, a
1Be δ f
2Temperature coefficient, δ T is temperature variation.
When using optical fiber Brillouin scattering sensing technology that built on stilts OPGW is monitored, the variation of temperature and strain can both cause that the frequency of Brillouin scattering is moved, because electric power tower and built on stilts OPGW close together, so temperature is close, and it is much smaller to the influence of Brillouin scattering optical frequency shift that temperature is compared strain, so can think that the temperature variation of the temperature variation of the surplus cable of OPGW on the electric power tower and built on stilts OPGW is identical, then the frequency shifts of the Brillouin scattering of built on stilts OPGW can be expressed as:
δf
2=a
2·δT+b·δε
（2）
In the formula (2), δ f
2Be the frequency displacement of the Brillouin scattering of built on stilts OPGW, a
2Be δ f
2Temperature coefficient, δ T is temperature variation, b is δ f
2The coefficient of strain, δ ε is the strain variation amount.
By formula (1) as can be known
（3）
Bringing formula (3) into formula (2) can get
（4）
Formula (3) has represented the temperature variation of the surplus cable of the OPGW of electric power tower place and the temperature variation of built on stilts OPGW, formula (4) has represented the strain variation amount of built on stilts OPGW, and OPGW goes up the generation icing, aeolian vibration, wave, thunderbolt, all can show as the variation of temperature and strain during phenomenons such as short circuit, namely monitor and to estimate the running status of OPGW by temperature and strain to OPGW, because of icing, aeolian vibration, wave, thunderbolt, in time carry out early warning before short circuit etc. cause the accident, and utilize the positioning function of Brillouin scattering sensing technology that the pre-origination point of accident is positioned.
Beneficial effect of the present invention, monitoring when having realized the temperature of built on stilts OPGW and strain: utilize the surplus cable of OPGW on the electric power tower to carry out temperature compensation, the temperature and the strain cross sensitivity problem that exist have been solved when with optical fiber Brillouin scattering sensing technology OPGW being monitored, monitoring when having realized the temperature of built on stilts OPGW and strain.
1. measuring accuracy height: optical fiber Brillouin scattering sensing technology has high temperature measurement accuracy and strain measurement precision, can satisfy icing to OPGW, waves, the needs of the status monitoring of phenomenons such as aeolian vibration, thunderbolt, short circuit, disconnected thigh.
2. can realize the location with the trouble spot of giving warning in advance of fault: monitor by temperature and strain to OPGW, in conjunction with other weather informations, can estimate the running status of OPGW, if icing arranged, wave, during fault generation such as aeolian vibration, thunderbolt, short circuit, disconnected thigh, can in time send early warning, and use optical fiber Brillouin scattering sensing technology can carry out localization of fault.
Description of drawings
Fig. 1 is for to carry out OPGW status monitoring synoptic diagram with BOTDA;
Fig. 2 is for to carry out OPGW status monitoring synoptic diagram with BOTDR.
Embodiment
A kind of method of utilizing the surplus cable of Optical Fiber composite overhead Ground Wire to solve the cross sensitivity of optical fiber Brillouin scattering monitoring existence, optical fiber Brillouin scattering demodulation analyser of the present invention links to each other with fiber core in the Optical Fiber composite overhead Ground Wire, carry out temperature compensation by the surplus cable of Optical Fiber composite overhead Ground Wire on electric power tower, solve the temperature of existing fiber Brillouin scattering sensing technology and the cross sensitivity of strain, realization to Optical Fiber composite overhead Ground Wire temperature and strain along the line carry out on-line monitoring, by the monitoring temperature of Optical Fiber composite overhead Ground Wire and the running status that two parameters of strain reflect Optical Fiber composite overhead Ground Wire.
The present invention is provided with the Optical Fiber composite overhead Ground Wire splice tray at part angle tower or the anchor support of transmission line of electricity, the splice tray place is provided with one section Optical Fiber composite overhead Ground Wire optical cable, this section optical cable is fixed on the electric power tower, when using the Brillouin scattering sensing technology that Optical Fiber composite overhead Ground Wire is monitored, have only temperature variation can cause Brillouin frequency shifts, icing, wind equal stress factor can not cause the Brillouin frequencies drift, with the surplus cable of this section Optical Fiber composite overhead Ground Wire optical cable called after Optical Fiber composite overhead Ground Wire.
The present invention is when adopting the Brillouin scattering sensing technology that the Optical Fiber composite overhead Ground Wire state is monitored, the surplus cable of Optical Fiber composite overhead Ground Wire on an electric power tower temperature influence, be used for the temperature compensation of built on stilts Optical Fiber composite overhead Ground Wire monitoring result, demodulate temperature and two parameters of strain of built on stilts Optical Fiber composite overhead Ground Wire.
The present invention uses the Brillouin scattering sensing technology that the monitoring of Optical Fiber composite overhead Ground Wire temperature along the line and two parameters of strain is reflected the running status of Optical Fiber composite overhead Ground Wire, and with the Brillouin scattering sensing technology accident point on the Optical Fiber composite overhead Ground Wire is accurately located.
Embodiment 1:
The present invention is provided with the OPGW splice tray at part angle tower or the anchor support of transmission line of electricity, the splice tray place is provided with one section OPGW optical cable, this section optical cable is fixed on the electric power tower, when using the Brillouin scattering sensing technology that OPGW is monitored, have only temperature variation can cause Brillouin frequency shifts, icing, wind equal stress factor can not cause the Brillouin frequencies drift, with the surplus cable of this section OPGW optical cable called after OPGW.
The present invention is when adopting the Brillouin scattering sensing technology that the OPGW state is monitored, and the surplus cable of the OPGW on an electric power tower temperature influence is used for the temperature compensation of built on stilts OPGW monitoring result, demodulates temperature and two parameters of strain of built on stilts OPGW.
The present invention uses the Brillouin scattering sensing technology that the monitoring of OPGW temperature along the line and two parameters of strain is reflected the running status of OPGW, and with the Brillouin scattering sensing technology accident point on the OPGW is accurately located.
As shown in Figure 1, BOTDA places in the transformer station, and link to each other with two fiber cores of OPGW, because pattern of wants loop when monitoring with BOTDA, the other end of two fiber cores that link to each other with BOTDA carries out welding to constitute a fiber-optic monitoring loop with fiber optic closure, just can be realized to reflect the running status of OPGW to the temperature of OPGW and the monitoring of strain by formula (3) and (4).
Embodiment 2:
As shown in Figure 2, BOTDR places in the transformer station, and links to each other with an OPGW fiber core, namely can be realized can reflecting the running status of OPGW to the temperature of OPGW and the monitoring of strain by formula (3) and (4).
Claims (4)
1. one kind is utilized the surplus cable of Optical Fiber composite overhead Ground Wire to solve the method that the cross sensitivity that exists is monitored in the optical fiber Brillouin scattering, it is characterized in that: optical fiber Brillouin scattering demodulation analyser links to each other with fiber core in the Optical Fiber composite overhead Ground Wire, carry out temperature compensation by the surplus cable of Optical Fiber composite overhead Ground Wire on electric power tower, solve the temperature of existing fiber Brillouin scattering sensing technology and the cross sensitivity of strain, realization to Optical Fiber composite overhead Ground Wire temperature and strain along the line carry out on-line monitoring, by the monitoring temperature of Optical Fiber composite overhead Ground Wire and the running status that two parameters of strain reflect Optical Fiber composite overhead Ground Wire.
2. by the described a kind of method of utilizing the surplus cable of Optical Fiber composite overhead Ground Wire to solve the cross sensitivity of optical fiber Brillouin scattering monitoring existence of claim 1, it is characterized in that: part angle tower or anchor support at transmission line of electricity are provided with the Optical Fiber composite overhead Ground Wire splice tray, the splice tray place is provided with one section Optical Fiber composite overhead Ground Wire optical cable, this section optical cable is fixed on the electric power tower, when using the Brillouin scattering sensing technology that Optical Fiber composite overhead Ground Wire is monitored, temperature variation can cause Brillouin frequency shifts, icing, the stress factors of wind can not cause the Brillouin frequencies drift, with the surplus cable of this section Optical Fiber composite overhead Ground Wire optical cable called after Optical Fiber composite overhead Ground Wire.
3. by the described a kind of method of utilizing the surplus cable of Optical Fiber composite overhead Ground Wire to solve the cross sensitivity of optical fiber Brillouin scattering monitoring existence of claim 1, it is characterized in that: when adopting the Brillouin scattering sensing technology that the Optical Fiber composite overhead Ground Wire state is monitored, the surplus cable of Optical Fiber composite overhead Ground Wire on an electric power tower temperature influence, be used for the temperature compensation of built on stilts Optical Fiber composite overhead Ground Wire monitoring result, demodulate temperature and two parameters of strain of built on stilts Optical Fiber composite overhead Ground Wire.
4. by the described a kind of method of utilizing the surplus cable of Optical Fiber composite overhead Ground Wire to solve the cross sensitivity of optical fiber Brillouin scattering monitoring existence of claim 1, it is characterized in that: use the Brillouin scattering sensing technology that the monitoring of Optical Fiber composite overhead Ground Wire temperature along the line and two parameters of strain is reflected the running status of Optical Fiber composite overhead Ground Wire, and with the Brillouin scattering sensing technology accident point on the Optical Fiber composite overhead Ground Wire is accurately located.
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| CN103760474A (en) * | 2014-01-27 | 2014-04-30 | 国家电网公司 | OPGW optical cable stress testing method |
| CN104089634A (en) * | 2014-07-07 | 2014-10-08 | 电子科技大学 | System for monitoring shaking and ice coating of power transmission cables in remote online mode and monitoring method |
| CN104111404A (en) * | 2014-06-16 | 2014-10-22 | 武汉康普常青软件技术股份有限公司 | Polarized light time domain reflection-based power transmission line fault detection system and positioning method |
| CN104121982A (en) * | 2014-06-16 | 2014-10-29 | 武汉康普常青软件技术股份有限公司 | Distributed type power transmission line OPGW aeolian vibration frequency on-line monitoring system |
| CN105136348A (en) * | 2015-09-11 | 2015-12-09 | 云南电网有限责任公司电力科学研究院 | Power transmission iron tower stress online monitoring system |
| CN106646670A (en) * | 2016-09-30 | 2017-05-10 | 国网电力科学研究院武汉南瑞有限责任公司 | Distributed micrometeorological monitoring method for transmission lines |
| CN106908008A (en) * | 2017-03-13 | 2017-06-30 | 贵州电网有限责任公司电力科学研究院 | A kind of transmission line of electricity distribution ice-melt monitoring method |
| CN106990331A (en) * | 2017-06-01 | 2017-07-28 | 武汉康普常青软件技术股份有限公司 | The localization method and device of OPGW |
| CN109238318A (en) * | 2017-07-11 | 2019-01-18 | 中光华研电子科技有限公司 | A kind of multi-parameter integrated monitoring system of transmission line of electricity based on distributing optical fiber sensing |
| CN110441651A (en) * | 2019-07-25 | 2019-11-12 | 武汉钜风科技有限公司 | A kind of transmission line status detection method and system based on OPGW |
| CN110631638A (en) * | 2019-10-18 | 2019-12-31 | 中冶南方工程技术有限公司 | Electric power iron tower monitoring system based on optical fiber sensing |
| CN110927524A (en) * | 2019-12-03 | 2020-03-27 | 董永康 | OPGW optical cable core breaking reason analysis and accurate positioning method based on BOTDR technology |
| CN111668936A (en) * | 2020-06-16 | 2020-09-15 | 中国南方电网有限责任公司超高压输电公司 | Optical fiber composite overhead ground wire direct-current ice melting temperature strain method and monitoring device |
| CN111711959A (en) * | 2020-06-02 | 2020-09-25 | 福建永福电力设计股份有限公司 | Method for arranging large-core-number OPGW (optical fiber composite overhead ground wire) connection points based on 5G communication multi-service fusion |
| CN112781514A (en) * | 2019-11-07 | 2021-05-11 | 中国石油化工股份有限公司 | Method, device and system for detecting abnormal internal pressure deformation of storage tank |
| CN117169658A (en) * | 2023-11-03 | 2023-12-05 | 四川省东舜智能科技有限公司 | Photoelectric hybrid cable monitoring method |
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| CN103760474A (en) * | 2014-01-27 | 2014-04-30 | 国家电网公司 | OPGW optical cable stress testing method |
| CN104111404A (en) * | 2014-06-16 | 2014-10-22 | 武汉康普常青软件技术股份有限公司 | Polarized light time domain reflection-based power transmission line fault detection system and positioning method |
| CN104121982A (en) * | 2014-06-16 | 2014-10-29 | 武汉康普常青软件技术股份有限公司 | Distributed type power transmission line OPGW aeolian vibration frequency on-line monitoring system |
| CN104089634A (en) * | 2014-07-07 | 2014-10-08 | 电子科技大学 | System for monitoring shaking and ice coating of power transmission cables in remote online mode and monitoring method |
| CN105136348A (en) * | 2015-09-11 | 2015-12-09 | 云南电网有限责任公司电力科学研究院 | Power transmission iron tower stress online monitoring system |
| CN106646670B (en) * | 2016-09-30 | 2019-06-11 | 国网电力科学研究院武汉南瑞有限责任公司 | A kind of transmission line of electricity distribution microclimate monitoring method |
| CN106646670A (en) * | 2016-09-30 | 2017-05-10 | 国网电力科学研究院武汉南瑞有限责任公司 | Distributed micrometeorological monitoring method for transmission lines |
| CN106908008A (en) * | 2017-03-13 | 2017-06-30 | 贵州电网有限责任公司电力科学研究院 | A kind of transmission line of electricity distribution ice-melt monitoring method |
| CN106990331B (en) * | 2017-06-01 | 2019-10-01 | 武汉康普常青软件技术股份有限公司 | The localization method and device of optical fiber composite overhead ground wire |
| CN106990331A (en) * | 2017-06-01 | 2017-07-28 | 武汉康普常青软件技术股份有限公司 | The localization method and device of OPGW |
| CN109238318A (en) * | 2017-07-11 | 2019-01-18 | 中光华研电子科技有限公司 | A kind of multi-parameter integrated monitoring system of transmission line of electricity based on distributing optical fiber sensing |
| CN110441651A (en) * | 2019-07-25 | 2019-11-12 | 武汉钜风科技有限公司 | A kind of transmission line status detection method and system based on OPGW |
| CN110631638A (en) * | 2019-10-18 | 2019-12-31 | 中冶南方工程技术有限公司 | Electric power iron tower monitoring system based on optical fiber sensing |
| CN112781514A (en) * | 2019-11-07 | 2021-05-11 | 中国石油化工股份有限公司 | Method, device and system for detecting abnormal internal pressure deformation of storage tank |
| CN110927524A (en) * | 2019-12-03 | 2020-03-27 | 董永康 | OPGW optical cable core breaking reason analysis and accurate positioning method based on BOTDR technology |
| CN111711959A (en) * | 2020-06-02 | 2020-09-25 | 福建永福电力设计股份有限公司 | Method for arranging large-core-number OPGW (optical fiber composite overhead ground wire) connection points based on 5G communication multi-service fusion |
| CN111711959B (en) * | 2020-06-02 | 2022-07-05 | 福建永福电力设计股份有限公司 | Method for arranging large-core-number OPGW (optical fiber composite overhead ground wire) connection points based on 5G communication multi-service fusion |
| CN111668936A (en) * | 2020-06-16 | 2020-09-15 | 中国南方电网有限责任公司超高压输电公司 | Optical fiber composite overhead ground wire direct-current ice melting temperature strain method and monitoring device |
| CN117169658A (en) * | 2023-11-03 | 2023-12-05 | 四川省东舜智能科技有限公司 | Photoelectric hybrid cable monitoring method |
| CN117169658B (en) * | 2023-11-03 | 2024-02-02 | 四川省东舜智能科技有限公司 | Photoelectric hybrid cable monitoring method |
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Application publication date: 20130925 |