CN105953942A - Distributed fiber based cable fault diagnosis system - Google Patents
Distributed fiber based cable fault diagnosis system Download PDFInfo
- Publication number
- CN105953942A CN105953942A CN201610340208.7A CN201610340208A CN105953942A CN 105953942 A CN105953942 A CN 105953942A CN 201610340208 A CN201610340208 A CN 201610340208A CN 105953942 A CN105953942 A CN 105953942A
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- light
- wavelength division
- division multiplexer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/324—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres using Raman scattering
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a distributed fiber based cable fault diagnosis system. The system comprises a pulse light source, a wavelength division multiplexer, a photoelectric detector, sensing fibers, a data collection card and a data analysis system, wherein the pulse light source is connected with the wavelength division multiplexer, the wavelength division multiplexer is connected with the sensing fibers and the photoelectric detector simultaneously, the photoelectric detector is connected with the data collection card, the data collection card is connected with the data analysis system, the pulse light source is directly connected with the data collection card, light pulses emitted by the pulse light source are input to the sensing fibers via the wavelength division multiplexer, Raman diffusion light is input to the photoelectric detector via the wavelength division multiplexer for photoelectric conversion and voltage amplification, and the data collection card collects signals output by the photoelectric detector and transmits the signals to the data analysis system for storage, analysis and early-warning. The system is accurate in the detection result, prevents influence of magnetic field, current and strain on a sensor, can improve the cable monitoring efficiency, and has high cost performance.
Description
Technical field
The present invention relates to cable fault diagnostic field, particularly relate to the event of a kind of cable based on distribution type fiber-optic
Barrier diagnostic system.
Background technology
Power cable is widely used in the various environment of power transmission and transformation, and along with the development of national economy,
The continuous transformation of Construction of Intercity Network, the usage amount of cable is increasing year by year, will gradually replace aerial line.For
Meet power generation safety and the needs of national economy production, it is desirable to the cable being embedded in underground allows for for a long time
Run continuously.Its insulating properties directly affects Power System Security And Reliability, how to carry out cable insulation
Monitoring, the difficult problem that always we face.Power cable is at high voltage, highfield, big electric current and complicated ring
Under the conditions of border, owing to copper loss and dielectric loss increase cause cable temperature rise, cable insulation can be aggravated aging and exhausted
Edge deteriorate, the most effectively cable temperature is monitored in real time, be realize cable status on-line monitoring,
Prevent accident and ensure the important means of electric power netting safe running.
The variations in temperature of power transmission cable is owing to electric current is caused by inner conductor under normal operating conditions
's.The thermal stability of cable dielectric has very close relationship with cable temperature change, once runs cable
Overload, conductor overload temperature will steeply rise.Power transmission cable insulation is owing to many factors acts on jointly
Occurring aging, leakage current increases, and the most relatively during gross leak electric current, more makes local temperature raise；Meanwhile,
If high tension cable internal links is not tight, conducting resistance increases, and local temperature also can increase, so passing through
Temperature monitoring can find cable insulation fault in time, fault do not result in cable connector blast, on fire before
Corresponding measure is taked to stop the generation of major accident.
Traditional cable fault monitoring method is mainly come according to the curent change in cable or shelf depreciation information
Judge the fault message of cable.These methods are difficult to remove external interference, and method is complicated, relatively costly.
And temperature method is easy to implement the method, and it is susceptible to the impact of the extraneous factor such as highfield and big electric current, the most general employing
Distribution type fiber-optic is measured temperature and is realized cable fault monitoring, but directly stickup optical fiber is on cable, light
The easy strained impact of data, monitoring result is inaccurate.
Summary of the invention
In order to solve above-mentioned technical problem, the present invention provides a kind of cable fault based on distribution type fiber-optic to diagnose
System, testing result is accurate, it is to avoid magnetic field, electric current and the strain impact on sensor, can improve cable ancient
Zither monitoring efficiency, has good cost performance simultaneously.
To this end, technical scheme is as follows:
A kind of cable fault diagnostic system based on distribution type fiber-optic, including light-pulse generator, wavelength division multiplexer,
Photodetector, sensor fibre, data collecting card and data analysis system；Described light-pulse generator is multiple with wavelength-division
Connecting with device, described wavelength division multiplexer is connected with sensor fibre, photodetector simultaneously；Described photodetection
Device is connected with data collecting card, and described data collecting card is connected with data analysis system；Described light-pulse generator is also
It is directly connected to data collecting card；
Described sensor fibre has a plurality of, its tie up or in spread on cable under test；
Described light-pulse generator sends light pulse that pulse the sends bidirectional coupler in wavelength division multiplexer and is coupled into
Sensor fibre；Interact with medium molecule when incident pulse light transmits in a fiber and produce backward spontaneous Raman
Scattered light, described Raman diffused light thin-film interference filters in wavelength division multiplexer leach Stokes light and
Anti-Stokes light, is input in the APD module of photodetector carry out opto-electronic conversion and voltage amplification；Institute
State data collecting card operation principle based on distributed fiber Raman temp measuring system and gather output in photodetector
Signal, and be transmitted to data analysis system；
Meanwhile, described data collecting card directly gathers synchronizable optical pulse data from described light-pulse generator, and will
It is transferred to data analysis system, as preset reference numerical value；
The data that the storage reception of described data analysis system comes, and the temperature data received is stored,
Analyzing, investigate the difference of range of temperature and preset reference numerical value, difference then continues to follow in excursion
Inscription of loop analyzes process；If difference excursion is external send fault pre-alarming while circular flow analyzed
Journey.
Preferably, described cable fault diagnostic system based on distribution type fiber-optic also includes that photoswitch, described light are opened
Pass is arranged between sensor fibre and photodetector, switches for light path, it is achieved a plurality of cable is entered by system
Row malfunction monitoring, further enhances the monitoring capability of system.
It is somebody's turn to do cable fault diagnostic system based on distribution type fiber-optic, has the advantage that
1) use distribution type fiber-optic that cable fault is monitored in real time, and can early warning in time.The distribution used
Formula optical fiber uses aluminium-alloy pipe to protect, and fills heat conductive silica gel, and whole optical fiber is tied up or in lay
On cable.So can avoid the cable strain impact on the temperature data of fiber laser arrays, relative to tradition
Distribution type fiber-optic can obtain accurate temperature information.
2) present invention can effectively monitor cable fault, and system is simple, can effectively reduce manual inspection
Labor intensity, and improve monitoring efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of present invention cable fault based on distribution type fiber-optic diagnostic system；
Fig. 2 is the workflow diagram of data analysis system.
Detailed description of the invention
Below in conjunction with drawings and Examples, technical scheme is described in detail.
As it is shown in figure 1, a kind of cable fault diagnostic system based on distribution type fiber-optic, including light-pulse generator,
Wavelength division multiplexer, photodetector, sensor fibre, data collecting card and data analysis system；Described pulse
Light source is connected with wavelength division multiplexer, and described wavelength division multiplexer is connected with sensor fibre, photodetector simultaneously；
Described photodetector is connected with data collecting card, and described data collecting card is connected with data analysis system；Institute
State light-pulse generator to be also directly connected to data collecting card；
Described light-pulse generator sends light pulse that pulse the sends bidirectional coupler in wavelength division multiplexer and is coupled into
Sensor fibre；Interact with medium molecule when incident pulse light transmits in a fiber and produce backward spontaneous Raman
Scattered light, described Raman diffused light thin-film interference filters in wavelength division multiplexer leach Stokes light and
Anti-Stokes light, is input in the APD module of photodetector carry out opto-electronic conversion and voltage amplification；Institute
State data collecting card operation principle based on distributed fiber Raman temp measuring system and gather output in photodetector
Signal, and be transmitted to data analysis system；
Meanwhile, described data collecting card directly gathers synchronizable optical pulse data from described light-pulse generator, and will
It is transferred to data analysis system, as preset reference numerical value；
As in figure 2 it is shown, the storage of described data analysis system receives the data of coming, and to the temperature number received
Storing, analyze according to carrying out, investigate the difference of range of temperature and preset reference numerical value, difference is at change model
Operating analysis process is then continued cycling through in enclosing；If difference excursion is external send fault pre-alarming while follow
Inscription of loop analyzes process.
Preferably, described cable fault diagnostic system based on distribution type fiber-optic also includes that photoswitch, described light are opened
Pass is arranged between sensor fibre and photodetector, switches for light path, it is achieved a plurality of cable is entered by system
Row malfunction monitoring, further enhances the monitoring capability of system.
In one embodiment of the invention, light-pulse generator centre wavelength is 1550nm, the non-10ns of pulse width,
Repetition rate is 10KHz, the non-20W of peak power.Wavelength division multiplexer is by 1 × 3 bidirectional coupler and multiple beam
The optical filter composition of interference-type high-isolation.Input 1550nm light, exports 1450nm and 1663nm
Light.Light opens the light for switching-over light path.Photodetector uses avalanche diode, and light intensity is converted to the signal of telecommunication.
Sensor fibre overcoat aluminium-alloy pipe, and fill heat conductive silica gel, then tie up or in be laid on cable.Data
Capture card gathers real-time temperature data.Data are stored by data analysis system, and are analyzed and in advance
Alert.
The operation principle of the present invention is: light pulse bidirectional coupler in wavelength division multiplexer is coupled into sense light
Fibre, interacts with medium molecule when incident pulse light transmits in a fiber and produces backward spontaneous Raman scattering
Light, when cable produces fault, cable temperature necessarily leads to change, the light intensity optical fiber local environment of scattered light
The change of temperature and change, scattered light thin-film interference filters in wavelength division multiplexer leaches Stokes light
With Anti-Stokes light, it is input in dual channel optoelectronic detector APD module carry out opto-electronic conversion and voltage is put
Greatly, signal is acquired by the highest several data collecting cards with certain sample rate, and the different sampling times is i.e.
Correspond to different fiber lengths.The data once gathered are stored in specific storage by data collecting card successively
Device, when next pulse sends, repeats above procedure, and the memory element storing data into correspondence is carried out
Repeatedly the data such as cumulative mean process, the temperature range then set with the cable that sets in system and change model
Enclose and judge, and determine whether cable is in malfunction.
The invention provides a kind of cable fault diagnostic system based on distribution type fiber-optic, system can improve cable
The efficiency of monitoring, can avoid magnetic field, electric current and the strain impact on sensor simultaneously.And this system is simple
Easy, and there is good cost performance.
Claims (2)
1. a cable fault diagnostic system based on distribution type fiber-optic, it is characterised in that: include light-pulse generator,
Wavelength division multiplexer, photodetector, sensor fibre, data collecting card and data analysis system；Described pulse
Light source is connected with wavelength division multiplexer, and described wavelength division multiplexer is connected with sensor fibre, photodetector simultaneously；
Described photodetector is connected with data collecting card, and described data collecting card is connected with data analysis system；Institute
State light-pulse generator to be also directly connected to data collecting card；
Described sensor fibre has a plurality of, its tie up or in spread on cable under test；
Described light-pulse generator sends light pulse that pulse the sends bidirectional coupler in wavelength division multiplexer and is coupled into
Sensor fibre；Interact with medium molecule when incident pulse light transmits in a fiber and produce backward spontaneous Raman
Scattered light, described Raman diffused light thin-film interference filters in wavelength division multiplexer leach Stokes light and
Anti-Stokes light, is input in the APD module of photodetector carry out opto-electronic conversion and voltage amplification；Institute
State data collecting card operation principle based on distributed fiber Raman temp measuring system and gather output in photodetector
Signal, and be transmitted to data analysis system；
Meanwhile, described data collecting card directly gathers synchronizable optical pulse data from described light-pulse generator, and will
It is transferred to data analysis system, as preset reference numerical value；
The data that the storage reception of described data analysis system comes, and the temperature data received is stored,
Analyzing, investigate the difference of range of temperature and preset reference numerical value, difference then continues to follow in excursion
Inscription of loop analyzes process；If difference excursion is external send fault pre-alarming while circular flow analyzed
Journey.
2. the cable fault diagnostic system of distribution type fiber-optic as claimed in claim 1, it is characterised in that: also wrap
Including photoswitch, described photoswitch is arranged between sensor fibre and photodetector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610340208.7A CN105953942A (en) | 2016-05-20 | 2016-05-20 | Distributed fiber based cable fault diagnosis system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610340208.7A CN105953942A (en) | 2016-05-20 | 2016-05-20 | Distributed fiber based cable fault diagnosis system |
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| CN105953942A true CN105953942A (en) | 2016-09-21 |
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| CN201610340208.7A Pending CN105953942A (en) | 2016-05-20 | 2016-05-20 | Distributed fiber based cable fault diagnosis system |
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Cited By (4)
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|---|---|---|---|---|
| CN105352613A (en) * | 2015-11-27 | 2016-02-24 | 国网北京市电力公司 | Temperature measuring system for cable joint |
| CN106989843A (en) * | 2017-03-27 | 2017-07-28 | 北京航空航天大学 | A kind of distributed multi-channel fiber Raman ultralow temperature measuring system |
| CN109029770A (en) * | 2018-06-25 | 2018-12-18 | 太原理工大学 | Distributed fiber Raman temperature and strain demodulation method based on loop demodulation |
| CN114034407A (en) * | 2021-10-29 | 2022-02-11 | 中国联合网络通信集团有限公司 | Optical cable tube well monitoring method and device and computer readable storage medium |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105352613A (en) * | 2015-11-27 | 2016-02-24 | 国网北京市电力公司 | Temperature measuring system for cable joint |
| CN106989843A (en) * | 2017-03-27 | 2017-07-28 | 北京航空航天大学 | A kind of distributed multi-channel fiber Raman ultralow temperature measuring system |
| CN109029770A (en) * | 2018-06-25 | 2018-12-18 | 太原理工大学 | Distributed fiber Raman temperature and strain demodulation method based on loop demodulation |
| CN109029770B (en) * | 2018-06-25 | 2020-01-03 | 太原理工大学 | Distributed optical fiber Raman temperature and strain demodulation method based on loop demodulation |
| CN114034407A (en) * | 2021-10-29 | 2022-02-11 | 中国联合网络通信集团有限公司 | Optical cable tube well monitoring method and device and computer readable storage medium |
| CN114034407B (en) * | 2021-10-29 | 2023-07-14 | 中国联合网络通信集团有限公司 | Method and device for monitoring optical cable tube well and computer readable storage medium |
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Application publication date: 20160921 |