CN201974251U - Distributed optical fiber online temperature monitoring system for electric power cable - Google Patents
Distributed optical fiber online temperature monitoring system for electric power cable Download PDFInfo
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- CN201974251U CN201974251U CN2010206480368U CN201020648036U CN201974251U CN 201974251 U CN201974251 U CN 201974251U CN 2010206480368 U CN2010206480368 U CN 2010206480368U CN 201020648036 U CN201020648036 U CN 201020648036U CN 201974251 U CN201974251 U CN 201974251U
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 38
- 239000013307 optical fiber Substances 0.000 title claims abstract description 33
- 230000003287 optical effect Effects 0.000 claims abstract description 68
- 238000012545 processing Methods 0.000 claims abstract description 21
- 239000000835 fiber Substances 0.000 claims description 15
- 239000004065 semiconductor Substances 0.000 claims description 5
- 238000001069 Raman spectroscopy Methods 0.000 abstract description 24
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- 230000001360 synchronised effect Effects 0.000 abstract 3
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- 238000004458 analytical method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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Abstract
The utility model discloses a distributed optical fiber online temperature monitoring system for an electric power cable, which comprises an optical transmitter, a synchronous control module, an optical path coupler, a constant temperature trough, an optical splitter, two optical receivers, a data collecting and processing module and a computer, wherein the synchronous control module is connected with the optical transmitter; the optical path coupler is connected with the optical transmitter; the constant temperature trough is connected with the optical path coupler; the optical splitter is connected with the optical path coupler; the two optical receivers are connected with the optical splitter; the data collecting and processing module is connected with the optical receivers; the computer is connected with the data collecting and processing module; the synchronous control module is also connected with the data collecting and processing module and the computer; and the distributed optical fiber online temperature monitoring system detects the variation of temperature of different positions along an optical fiber by using an advanced optical time domain reflection technology and the characteristic of the sensitivity of Raman scattered lights to the temperature, increases the accuracy and generality of monitoring results, and realizes the systematic, comprehensive and accurate monitoring on the electric power cable.
Description
Technical field
The utility model relates to the power technology field, relates in particular to a kind of power cable distribution type fiber-optic on-line temperature monitoring system.
Background technology
Because high voltage power cable is layed in underground, maintenance is usually not in place behind the long-play, add the influence of factors such as environment temperature, the defective position of part tends to heating, and electric current is big more, temperature raises fast more, heat generating spot resistance increases, thereby produces more heat, makes resistance further increase, temperature continues to raise, and forms vicious cycle.If untimely discovery and processing cause on fire or blast the most at last, cause circuit to damage, but serious initiation fire and large-area power outage.This phenomenon seems particularly general in the area faster in load growth.
At present, temperature monitoring to the significant points of power cable such as joint etc. is mainly still measured by manually going, telemeasurement is carried out with infrared ray or laser thermodetector in the scene of for example regularly sending someone, mainly there is following problem in the method for this manual measurement: 1. monitoring periods is long, and many local heating phenomenons can not get in time finding and handling; 2. monitoring range is restricted, can only the detection streamer joint, can't partly monitor the power cable that is enclosed in the pipeline; 3. detect and analysis and judgement by manually carrying out, therefore influenced by human factor bigger for detection and analysis result; 4. infrared ray or laser thermodetector price are often relatively more expensive, are subjected to capital effect, and it is universal and the popularization difficulty is bigger.
In recent years, ABB, Siemens and more domestic manufacturers have also developed some high voltage power cable temperature monitoring equipment successively, but from applicable cases, effect is not very desirable, mainly shows the following aspects: the technological difficulties that 1. high-tension isolation is the high voltage power cable temperature monitoring system also are key problem in technology.Existing temperature monitoring method mainly adopts thermocouple, thermal resistance, semiconductor temperature sensor equitemperature sensing element to realize, these temperature sensors are not the temperature of directly measuring charged object generally, and need by the plain conductor transmission signals, sensor itself with and signal transmission passage be subjected to the influence of electromagnetic interference (EMI) and environment bigger, insulating property can't be guaranteed, thereby the accuracy of monitoring result can't be guaranteed; 2. traditional temperature monitoring ubiquity sensor bulk is bigger than normal, difficulty is installed, be subject to environment and peripheral electromagnetic field interference, need manually-operated, realize the problem such as with high costs of on-line monitoring, especially can't on the whole piece power cable, install, the temperature monitoring of the part joint of sub-fraction power cable can only be realized, the system of whole power cables, comprehensive, accurately monitoring can't be realized; 3. existing power cable temperature monitoring system or equipment, the overwhelming majority be electric power primary equipment manufacturer develop at own product monitoring equipment, function singleness, versatility is poor, the operative norm confusion, and, be difficult to popularize and promote with supervisory system interface difficulties such as power transformation comprehensive automations.
The utility model content
The utility model purpose is to provide a kind of power cable distribution type fiber-optic on-line temperature monitoring system, improves the accuracy and the versatility of monitoring result, realizes the system of power cable, comprehensive and accurate monitoring.
The utility model is realized by following technical proposals, a kind of power cable distribution type fiber-optic on-line temperature monitoring system comprises: optical sender, the synchronization control module that is connected with described optical sender, the light path coupler that is connected with described optical sender, the calibration cell that is connected with described light path coupler, the optical splitter that is connected with described light path coupler, two photoreceivers that are connected with described optical splitter, the data acquisition that is connected with described photoreceiver and processing module, the computing machine that is connected with processing module with described data acquisition; Described synchronization control module also is connected with described computing machine with processing module with described data acquisition;
Described optical sender is used for output optical pulse under the triggering of described synchronization control module; Described light path coupler is used to receive the light pulse of described optical sender output, exports to described calibration cell; Described calibration cell is used for sensor fibre is exported in described light pulse;
Described light path coupler also is used for the Raman scattering that described sensor fibre scattering is returned is optically coupled to described optical splitter; Described optical splitter is used for leaching stokes light and anti-Stokes light from described Raman scattered light; Described two photoreceivers are respectively applied for and receive described stokes light and anti-Stokes light, and carry out opto-electronic conversion and processing and amplifying, the signal after output is handled; Described data acquisition and processing module are used for the signal of described photoreceiver output is sampled and handled the data-signal after output is handled; Described computing machine is used for the data-signal according to described data acquisition and processing module output, calculates temperature.
Further, described optical splitter comprises two optical filters, and one of them optical filter is used for leaching stokes light from described Raman scattered light, and another optical filter is used for leaching anti-Stokes light from described Raman scattered light.
Further, described optical sender also comprises semiconductor laser, and described optical sender is connected with described light path coupler by the laser instrument tail optical fiber.
Further, described calibration cell is connected with the temperature field by sensor fibre.
The power cable distribution type fiber-optic on-line temperature monitoring system that the utility model provides, adopt advanced optical time domain reflection technology and the thermally sensitive characteristic of Raman scattered light, detect along the variation of temperature of optical fiber diverse location, improve the accuracy and the versatility of monitoring result, realized the system of power cable, comprehensive and accurate monitoring.
Description of drawings
Fig. 1 is a Raman scattering frequency displacement synoptic diagram in the utility model;
The structural representation of power cable distribution type fiber-optic on-line temperature monitoring one embodiment of system that Fig. 2 provides for the utility model.
Embodiment
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
At first, the power cable distribution type fiber-optic on-line temperature monitoring system that the utility model is provided realizes that the ultimate principle of temperature-monitoring function institute foundation is introduced.The ultimate principle of this institute of system foundation is the distributed fiber temperature sensing principle, it mainly utilizes the optical time domain reflectometer of optical fiber, and (Optical Time Domain Reflectometer, be called for short: OTDR) principle and optical fiber is back to Raman scattering (Raman scattering) temperature effect.Specifically, when a light pulse when an end-fire of optical fiber is gone into optical fiber, this light pulse meeting is propagated forward along optical fiber.Because of the similar minute surface of optical fiber inwall, so light pulse every bit in the air all can produce reflection, a fraction of reflected light is arranged among the reflection, its direction is just in time opposite with the incident direction of light.The temperature of the reflection spot in this retroreflection light intensity and the light has certain relation.The temperature of reflection spot (the residing environment temperature of optical fiber) is high more, and catoptrical intensity is also big more.That is to say that the retroreflection light intensity can reflect the temperature of reflection spot.Utilize this phenomenon, if energy measurement goes out the retroreflection light intensity, just can calculate the temperature of reflection spot, Here it is utilizes the ultimate principle of optical fiber measurement temperature.
Fig. 1 is a Raman scattering frequency displacement synoptic diagram in the utility model.When frequency is that the laser of v0 incides in the optical fiber, it constantly produces the back scattering light wave in the transmission forward in optical fiber, except a center spectral line identical with incident light frequency v0 is arranged, exist also in its both sides that (the v0-Δ reaches v) that (the v0+ Δ is two spectral lines v) in these back scattering light waves.Wherein the center spectral line is the Rayleigh scattering spectral line, low frequency one side frequency is for (the v0-Δ v), wavelength is that the spectral line of λ s is called Stokes (Stokes) line, referring to the D among Fig. 1, high frequency one side frequency is for (the v0+ Δ v), wavelength is the spectral line of λ a, be called anti-Stokes (Anti-stokes) line, referring to the C among Fig. 1.In addition, the A among Fig. 1 is the incoming signal line, and B is a Brillouin line.
According to the Raman scattering theory, under natural Raman scattering condition, the catoptrical light intensity of two bundles is relevant with temperature.Influences such as loss for the instability of eliminating laser tube output, fibre-optical bending, joint, improve the thermometric accuracy, in system design, adopt binary channels dual wavelength method relatively, as shown in Figure 1, promptly stokes light and anti-Stokes light are gathered respectively, utilized the ratio demodulation temperature signal of both intensity.Because anti-Stokes light is more sensitive to temperature, therefore, as signalling channel, stokes light is passage as a comparison with anti-Stokes light, and then strength ratio between the two is:
In formula (1), λ s and λ a are respectively the wavelength of stokes light and anti-Stokes light; H is a Planck's constant; C is the light velocity in the vacuum; K is a Boltzmann constant; Vo is the incident light frequency; T is an absolute temperature.
As can be seen, R (T) is relevant with temperature T from formula (1), and irrelevant with light intensity, incident condition, fiber geometries size and optical fiber composition.Therefore, by the measurement that can realize temperature behind detection anti-Stokes and the Stokes to the ratio of Raman scattering light intensity.In addition, utilize the OTDR technology, can also monitor the trouble spot of optical fiber and the position of breakpoint according to the loss of laser backscatter signal in optical fiber, and then know that cable break for information about.Wherein Raman scattering is because the thermal vibration of optical fiber molecule, it can produce stokes light and than an optical source wavelength short anti-Stokes light longer than optical source wavelength every of optical fiber, optical fiber is subjected to extraneous thermal effect, anti-Stokes light intensity in the optical fiber changes, by measuring frequency displacement, Stokes light intensity Is and the anti-Stokes light intensity Ia of Raman scattered light, to eliminate influences such as aging decay of non-temperature effect such as optical fiber and torsional deformation, can calculate the temperature of measured point through orthogonalization process.Can demarcate fiber lengths according to emission incident pulse light with the mistiming that receives Raman scattered light, realize the location of measured point.Suppose to detect the Raman scattered light that from section i produce at the incident end through ti after second behind the laser pulse input optical fibre, then section i and incident end apart from xi is:
xi＝cti/2n
In the following formula, c is a light velocity of propagation in a vacuum; N is the refractive index of fiber medium.
According to above-mentioned test philosophy, the utility model provides a kind of power cable distribution type fiber-optic on-line temperature monitoring system.The structural representation of power cable distribution type fiber-optic on-line temperature monitoring one embodiment of system that Fig. 2 provides for the utility model.As shown in Figure 2, this system comprises: optical sender 11, the synchronization control module 12 that is connected with optical sender 11, the light path coupler 13 that is connected with optical sender 11, the calibration cell 14 that is connected with light path coupler 13, the optical splitter 15 that is connected with light path coupler 13, two photoreceivers 16 and 17 that are connected with optical splitter 15, the data acquisition that is connected with 17 with photoreceiver 16 and processing module 18, the computing machine 19 that is connected with processing module 18 with data acquisition; Synchronization control module 12 also is connected with computing machine 19 with processing module 18 with data acquisition.
Further, optical splitter 15 comprises two optical filters 20 and 21, and wherein optical filter 20 is used for leaching stokes light from Raman scattered light, and optical filter 21 is used for leaching anti-Stokes light from Raman scattered light.
Further, optical sender 11 also comprises semiconductor laser, and optical sender 11 is connected with light path coupler 13 by the laser instrument tail optical fiber.
Further, described calibration cell is connected with the temperature field by sensor fibre.
Specifically, under the triggering of synchronization control module 12, optical sender produces a heavy current pulse, this current impulse drives semiconductor laser and produces powerful light pulse, and in the injection laser tail optical fiber, to enter one section optical fiber (being used for system calibrating) that is placed on the calibration cell 14 through behind the light path coupler 13 from the light pulse of laser instrument tail optical fiber output, enter sensor fibre then.
When scattering takes place in laser in sensor fibre after, the Raman's rear orientation light that carries temperature information will turn back in the light path coupler 13, light path coupler 13 not only can couple directly to sensor fibre with the light pulse that optical sender 11 produces, but also the Raman scattering that is different from emission wavelength that scattering can be returned is optically coupled to optical splitter 15.Optical splitter 15 is made up of the optical filter 20 and 21 of two different centre wavelengths, they leach stokes light and anti-Stokes light respectively, two ways of optical signals is passed through photoreceiver 16 respectively and was carried out opto-electronic conversion and amplification at 17 o'clock, carry out the high-speed data sampling and be converted to digital quantity by data acquisition and processing module 18 then, through signal is further handled (raising signal to noise ratio (S/N ratio)), send into computing machine 19 and carry out the calculating of temperature at last.
Can obtain according to formula (1):
(it is T that calibration cell is demarcated temperature for fixing temperature
0), then have:
Can obtain according to formula (2) and (3):
Therefore, after temp measuring system is demarcated,, utilize known temperature T by measuring R (T)
0Under the ratio R (T of light intensity
0),, just can determine to the travel-time of light wave according to the back along the temperature value of each measurement point of optical fiber.
The power cable distribution type fiber-optic on-line temperature monitoring system that the foregoing description provides utilizes optical fiber to realize sensing and signal transmission, adopt advanced OTDR technology and the thermally sensitive characteristic of Raman scattered light, detect along the variation of temperature of optical fiber diverse location, measuring distance is several kilometers scope, sterically defined resolution reaches 1 meter, can carry out uninterrupted automatic measurement, as power cable, need be specially adapted to the application scenario of multimetering on a large scale.This system adopts sensor fibre to make detector, itself is not charged, fundamentally eliminated the influence of environment and electromagnetic interference (EMI) to measurement result, have advantages such as essence is explosion-proof, lightning protection, anticorrosion, anti-electromagnetic interference (EMI), can be used for high-tension cable, belt feeder, oil, pipe leakage, tunnel fire hazard detection, dam safety monitoring etc.The temperature information of this system acquisition is not subjected to electromagnetic interference (EMI) by optical signal transmission, moisture proof, though transmission range is long, loss is little.This system stability and reliability are good, also easily expansion.
It should be noted last that, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art should be appreciated that and every the technical solution of the utility model is made amendment or is equal to the scope that replacement does not all break away from technical solutions of the utility model.
Claims (4)
1. power cable distribution type fiber-optic on-line temperature monitoring system, it is characterized in that, comprising: optical sender, the synchronization control module that is connected with described optical sender, the light path coupler that is connected with described optical sender, the calibration cell that is connected with described light path coupler, the optical splitter that is connected with described light path coupler, two photoreceivers that are connected with described optical splitter, the data acquisition that is connected with described photoreceiver and processing module, the computing machine that is connected with processing module with described data acquisition; Described synchronization control module also is connected with described computing machine with processing module with described data acquisition.
2. power cable distribution type fiber-optic on-line temperature monitoring according to claim 1 system is characterized in that described optical splitter comprises two optical filters, and two optical filters connect two photoreceivers respectively.
3. power cable distribution type fiber-optic on-line temperature monitoring according to claim 1 system is characterized in that described optical sender also comprises semiconductor laser, and described optical sender is connected with described light path coupler by the laser instrument tail optical fiber.
4. power cable distribution type fiber-optic on-line temperature monitoring according to claim 1 system is characterized in that, described calibration cell is connected by sensor fibre and temperature.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102393263A (en) * | 2011-12-06 | 2012-03-28 | 山东电力集团公司青岛供电公司 | Cable tunnel fiber online temperature monitoring system |
| CN105352625A (en) * | 2015-10-21 | 2016-02-24 | 国家电网公司 | Temperature measurement system for dry-type hollow reactor |
| CN105651417A (en) * | 2016-03-23 | 2016-06-08 | 上海斐讯数据通信技术有限公司 | Temperature real-time monitoring device, system and method based on distributed optical fiber |
| CN105987771A (en) * | 2016-07-01 | 2016-10-05 | 深圳艾瑞斯通技术有限公司 | Temperature monitoring method and system based on optical fiber |
| CN106153213A (en) * | 2016-06-24 | 2016-11-23 | 桂林创研科技有限公司 | A kind of novel optical fiber temperature monitoring system |
| CN106257249A (en) * | 2015-11-13 | 2016-12-28 | 云南航天工程物探检测股份有限公司 | It is applicable to temperature-measuring system of distributed fibers and the temp measuring method of tunnel thermometric |
| CN106353003A (en) * | 2016-08-10 | 2017-01-25 | 深圳艾瑞斯通技术有限公司 | Distributed optical fiber temperature measuring method and system |
| CN106872114A (en) * | 2016-12-30 | 2017-06-20 | 北京航天易联科技发展有限公司 | A kind of heat supply pipeline monitoring of leakage method and system |
| CN111238681A (en) * | 2020-02-20 | 2020-06-05 | 云南电网有限责任公司电力科学研究院 | Distributed temperature measurement system and method for power transformer |
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2010
- 2010-12-08 CN CN2010206480368U patent/CN201974251U/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102393263A (en) * | 2011-12-06 | 2012-03-28 | 山东电力集团公司青岛供电公司 | Cable tunnel fiber online temperature monitoring system |
| CN105352625A (en) * | 2015-10-21 | 2016-02-24 | 国家电网公司 | Temperature measurement system for dry-type hollow reactor |
| CN106257249A (en) * | 2015-11-13 | 2016-12-28 | 云南航天工程物探检测股份有限公司 | It is applicable to temperature-measuring system of distributed fibers and the temp measuring method of tunnel thermometric |
| CN105651417A (en) * | 2016-03-23 | 2016-06-08 | 上海斐讯数据通信技术有限公司 | Temperature real-time monitoring device, system and method based on distributed optical fiber |
| CN105651417B (en) * | 2016-03-23 | 2018-05-18 | 上海斐讯数据通信技术有限公司 | A kind of temperature real-time monitoring equipment, system and method based on distribution type fiber-optic |
| CN106153213A (en) * | 2016-06-24 | 2016-11-23 | 桂林创研科技有限公司 | A kind of novel optical fiber temperature monitoring system |
| CN105987771A (en) * | 2016-07-01 | 2016-10-05 | 深圳艾瑞斯通技术有限公司 | Temperature monitoring method and system based on optical fiber |
| CN106353003A (en) * | 2016-08-10 | 2017-01-25 | 深圳艾瑞斯通技术有限公司 | Distributed optical fiber temperature measuring method and system |
| CN106353003B (en) * | 2016-08-10 | 2019-03-01 | 深圳艾瑞斯通技术有限公司 | A kind of distributed optical fiber temperature measuring method and system |
| CN106872114A (en) * | 2016-12-30 | 2017-06-20 | 北京航天易联科技发展有限公司 | A kind of heat supply pipeline monitoring of leakage method and system |
| CN111238681A (en) * | 2020-02-20 | 2020-06-05 | 云南电网有限责任公司电力科学研究院 | Distributed temperature measurement system and method for power transformer |
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Effective date of registration: 20140326 Address after: 100761 West Chang'an Avenue, Beijing, No. 86, No. Patentee after: State Grid Corporation of China Patentee after: Yan'an Power Supply Bureau Patentee after: Shandong Kehua Electric Power Technology Co., Ltd. Address before: 716000, Dongguan Street, Baota District, Shaanxi, Yanan Patentee before: Yan'an Power Supply Bureau Patentee before: Shandong Kehua Electric Power Technology Co., Ltd. |
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