CN102313852A - Optical-fiber intelligent sensing power cable running state monitoring method and apparatus thereof - Google Patents
Optical-fiber intelligent sensing power cable running state monitoring method and apparatus thereof Download PDFInfo
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- CN102313852A CN102313852A CN201110217984A CN201110217984A CN102313852A CN 102313852 A CN102313852 A CN 102313852A CN 201110217984 A CN201110217984 A CN 201110217984A CN 201110217984 A CN201110217984 A CN 201110217984A CN 102313852 A CN102313852 A CN 102313852A
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Abstract
An optical-fiber intelligent sensing power cable running state monitoring method and an apparatus thereof are disclosed. In the method, based on sensitivity of an optical fiber sensing probe to a temperature, stress/ strain, an auxiliary clamp is used to fix optical-fiber power-cable intelligent sensors established by a plurality of optical fiber sensing probes on power cable running state monitoring points to real-timely monitor an operation temperature of the power cable. A temperature field of the power cable can be reconstructed through figures and the power cable operation state can be real-timely monitored. The apparatus comprises: the optical-fiber power-cable intelligent sensors, a transmission fiber, a data analysis and processing apparatus. The optical-fiber power-cable intelligent sensors, which are thin-wall circular-ring shaped components formed by hierarchically packaging a plurality of optical fiber sensing probes along a radial direction and an axial direction of the power cable, is fixed on the power cable. Output signals of the optical fiber sensing probes in the optical-fiber power-cable intelligent sensors are transmitted to the data analysis and processing apparatus through transmission fibers. The apparatus has a small volume, a simple structure and is insulated. External power is not needed. The apparatus is suitable for monitoring the multi-strip multi-point power cable operation state.
Description
Technical field:
The invention belongs to technical field of optical fiber sensing, relate to a kind of optical-fiber intelligent sensing power cable method for monitoring operation states and device.
Background technology:
Power industry belongs to the basic activity of national economic development; Critical role is arranged in national economic development; Along with the fast development of economy, each country is all increasing the demand of electric power day by day, causes that rated voltage and rated current grade improve year by year in the electric system.Because the decline of power cable application cost; And the power supply reliability that power cable self had is high, the influence that do not receive ground, space buildings, do not receive weather extremes infringement, characteristics such as durable safe and out of sight; Thereby obtained application more and more widely; Especially in the city, generating plant and transformer station turnover congested area, line corridor, big rivers and lakes or area, straits, in the time of can not adopting overhead transmission line, need to adopt the power cable transmission of electricity.Compare with overhead transmission line; The above-mentioned advantage of power cable but for the maintenance work of later stage cable particularly fault localization brought characteristics such as the unobservable property of bigger difficulty, especially line fault all to determine the cable line requirement that more accurate fault monitoring method is arranged with the location; On the other hand; Power cable is as the important component part of whole electric system, in case break down the safe operation that directly affects whole electric system, and find untimely like fault; Then possibly cause bigger damage sequences such as fire, massive blackout; Therefore how to search power cable fault quickly and accurately, reduce fault restoration expense and loss of outage, become the problem of power engineering field and research circle's growing interest.
Power cable line adopts direct burial, framework type mostly and mode such as lays under water; Because of laying environment, soil thermal resistance, close on radiating condition difference such as thermal source on the way; Tend to cause cable line local hot spot to occur and form the current-carrying capacity ink-bottle effect; If this moment only confirm cable line current-carrying capacity and load capacity according to criterion calculation result or partial points temperature measurement result, may cause the circuit minor insulation overheated and the generation electricity-thermal breakdown interruption of service; On the other hand, local defect, insulation breakdown omen and unexpected fire etc. all can cause System for Surface Temperatures of Power Cables unusual thermal effect to occur to some extent in power cable or annex medium.Between the electrical equipments such as the isolating switch of electric system, transformer, cable, bus, switch cubicle by connections such as bus, lead-in wire, cables, because electric current flows through the generation heat, so nearly all electric fault all can cause the trouble spot variation of temperature.Compare with the power cable body, power cable terminal and intermediate head be weak link especially, that is to say that the quality of power cable body, terminal and intermediate head structure directly has influence on the safe operation of power cable line.
Because the restriction of technical merit makes the safe operation of electric system power cable receive certain limitation, the method for insulate after originally main dependence regularly has a power failure prevention and testing circuit has been difficult to satisfy real requirement for many years.Many in recent years researchers have proposed some new online charged detection methods, and these methods are to the early detection power cable, and particularly the insulation defect and the aging conditions of twisted polyethylene cable existence have effect very much, and following several method is arranged usually:
(1) dc superposition method: the neutral point place at the voltage transformer (VT) of ground connection adds low-voltage dc power supply; Make the alternating voltage stack of this DC voltage and cable in service; Detect atomic weak DC current through cable insulation; Can record the insulation resistance of whole piece cable, thereby judge the quality of cable.The characteristics of dc superposition method are that antijamming capability is stronger, but the correlativity of insulation resistance and cable insulation residual life and bad, dispersiveness is quite big.
(2) DC component method: through atomic weak flip-flop in detection streamer heart yearn and the screen layer electric current, in the cable certain a bit or a certain local branchization (water tree, the electric branch) insulation defect that exists carry out the deterioration diagnosis.A little less than the electric current that the DC component method records was atomic, also not quite stable sometimes, small interference current will cause very mistake.
(3) dielectric dissipation factor method: the voltage that will be added on the cable takes out with voltage transformer (VT) or voltage divider; The power current Current Transformer that will flow through in the insulation is taken out; In the self-poise loop, detect the phase differential of above-mentioned signal then, can measure the dielectric dissipation factor of cable insulation.
(4) thermopair, semiconductor temperature sensor, electronic type thermometer thermometry: because each monitoring point all needs power supply, wiring, wiring complicacy and electromagnetic interference (EMI) is serious, fragile, maintenance is big; Sensor does not possess self-checking function, needs frequent verification.
(5) temperature sensing cable formula temp measuring system: with temperature sensing cable and cable parallelization, when cable temperature surpassed the fixed temperature value, the sensing cable was by short circuit.System only can disposablely use, and can not measure the actual temperature value of cable; Because number of cables is many, system installs and maintenance work makes things convenient for inadequately, and equipment is fragile; The initial failure prediction can not be carried out, measured value can not be shown in real time, no temperature trend analysis.
(6) infrared imaging temperature measuring method: mainly be applicable to outdoor terminal and positions such as cable connection point and earth point, be vulnerable to the power cable surrounding environment change, the influence of electromagnetic interference (EMI), aerosol influence and object emissivity.
(7) distributed optical fiber temperature sensor: realize the cable fault location through near the temperature variations detection failure point, because of measured temperature is a medial temperature in the scope, precision is not high, can not accurately reflect the temperature of each point, the temperature of cable core.
Summary of the invention:
The present invention is directed to the deficiency of above-mentioned prior art: a kind of optical-fiber intelligent sensing power cable method for monitoring operation states and device are provided.This device volume is little, and is in light weight, simple in structure; No electromagnetic interference (EMI); Good stability, essence insulation need not connect external power, can the multi-thread real-time measurement of multiple spot; Be applicable to the monitoring of single core, multicore, multiple spot, many power cables (as follows) running status, can obtain real-time current, real time temperature, electrical network phase current, overload state, localization of fault, anti-theft antitheft, environment temperature monitoring and the illegal invasion situation etc. of the operation of power cable.
The technical scheme that the present invention adopted is:
A kind of optical-fiber intelligent sensing power cable method for monitoring operation states; It is characterized in that; Based on the susceptibility of the Fibre Optical Sensor in the optical fiber sensing probe to temperature, stress and strain, the optical fiber power cable intelligence sensor of a plurality of optical fiber sensing probes being set up by auxiliary clamp is fixed on around the cable of power cable monitoring running state point, the running temperature of real-time monitoring power cable; Through the temperature field of digital reconstruction power cable, real-time monitoring power cable running status and running quality.
The used device of optical-fiber intelligent sensing power cable method for monitoring operation states of the present invention, it comprises one or more optical fiber power cable intelligence sensors, Transmission Fibers, data analysis and treating apparatus; Described optical fiber power cable intelligence sensor; Utilize the parts of the similar thin wall circular structure that one or more auxiliary clamps and one or more auxiliary part be packaged into along the radial and axial layering of power cable for a plurality of optical fiber sensing probes; Fit over around the power cable; Described a plurality of optical fiber sensing probe connects described Transmission Fibers; Its Transmission Fibers linking number according to one's analysis with treating apparatus, tested power cable temperature signal is transferred to data analysis and treating apparatus analyzing and processing Monitoring Data.
In the technical scheme of the present invention, described auxiliary clamp, auxiliary part, optical fiber power cable intelligence sensor and Transmission Fibers are designed to and tested power cable size and the required shape of actual measurement environmental requirement.
In the technical scheme of the present invention, optical fiber sensing probe, auxiliary clamp, auxiliary part, optical fiber power cable intelligence sensor, Transmission Fibers all adopt the insulating material insulation.
In the technical scheme of the present invention, optical fiber sensing probe utilizes Fibre Optical Sensor cable running status, perhaps utilizes optical fiber grating sensing power cable running status.
In the technical scheme of the present invention, according to the actual environment and the power cable of one or more power cable of laying, preset the installation environment parameter of power cable and the structural parameters of power cable in data analysis and the treating apparatus.
The method of application of optical-fiber intelligent sensing power cable monitoring running state device of the present invention: optical fiber power cable intelligence sensor is according to tested power cable dimensioned; And being fixed on the power cable monitoring point by auxiliary clamp and auxiliary part, the optical fiber sensing probe output signal in the optical fiber power cable intelligence sensor is transported to data analysis and treating apparatus through Transmission Fibers; Through the installation environment parameter of the preset power cable of data analysis and treating apparatus and the structural parameters of power cable, the running status of Theoretical Calculation power cable; When the power cable current-carrying; The metallic conductor of power cable core can generate heat; And gradually to the outer heat radiation of power cable cable; The signal of the optical fiber sensing probe in the optical fiber power cable intelligence sensor changes, and carries out obtaining power cable structure real-time running state after data processing and the analysis through data analysis and treating apparatus.
The optical fiber sensing probe of optical-fiber intelligent sensing power cable monitoring running state device of the present invention; Real-time monitoring power cable temperature; Auxiliary clamp and auxiliary part are encapsulated into a plurality of optical fiber sensing probes in the optical fiber power cable intelligence sensor; The tested power cable temperature signal of Transmission Fibers transmission arrives data analysis and treating apparatus, and data analysis and treating apparatus are preset, the preanalysis power cable has related parameter and analyzing and processing Monitoring Data.
The application of optical-fiber intelligent sensing power cable monitoring running state device of the present invention: when the power cable current-carrying; The metallic conductor of electric-cable core can generate heat; And gradually to the outer heat radiation of electric-cable core; By the optical fiber sensing probe in the optical fiber power cable intelligence sensor, can monitor the radial and axial temperature signal of power cable in real time.When the current signal of power cable changes; The metallic conductor heating of power cable core is different; Cause the transducing signal of a plurality of optical fiber sensing probes in the optical fiber power cable intelligence sensor to change thereupon; And deliver to data analysis and treating apparatus carries out data processing and analysis through Transmission Fibers, obtain the real-time running state of power cable.
The present invention is encapsulated into a plurality of optical fiber sensing probes in the optical fiber power cable intelligence sensor through auxiliary clamp and auxiliary part, and the real-time radial and axial temperature of monitoring power cable is for the temperature field of digital reconstruction electric-cable core provides parameter.
Data analysis among the present invention and treating apparatus can carry out theoretical analysis and calculating according to the actual environment and the power cable parameter of many power cables of laying; The ruuning situation of theoretical prediction power cable; Such as: the electric load situation; Electric power power cable current conditions etc. are for the actual motion status monitoring of power cable carries out Theoretical Calculation and analysis.
Data analysis among the present invention and treating apparatus are analyzed a plurality of optical fiber sensing probe Monitoring Data of many multiple spot power cable monitoring running state points; Can obtain the operational monitoring and the analysis of the running status of power cable; Such as: power cable real-time current, real time temperature, electrical network phase current, overload state, localization of fault, anti-theft antitheft, environment temperature monitoring, illegal invasion situation etc.; Effectively the febrile state of monitoring power cable under different loads and varying environment temperature accumulates historical technical data; The current-carrying capacity limit is analyzed, and guarantees be no more than under the situation that cable allows running temperature, bring into play to greatest extent cable transmittability, increase economic efficiency; Find the local hot spot on the cable, in time take to fall the stream cooling measure, delay the cable aging speed; The real time fail monitoring and warning is found the destruction that extraneous factor causes in the cable operational process; Power cable fire monitoring and warning; The temperature monitoring of cable splice, cable termination and warning.
Advantage of the present invention: this device can be realized the structure monitoring of the multichannel multiple spot of power cable, and measuring accuracy and resolution are high; Sensing signal and transmission signals are light signal, do not receive electromagnetic interference (EMI), are not vibrated and the influence of nuclear radiation; Good environmental adaptability, good stability can be used for high temperature, high humidity for a long time and have the rugged surroundings of chemical erosion etc.; In light weight, volume is little, and is easy to install, and the essence insulation need not connect external power.
Description of drawings:
Fig. 1 is an optical fiber power cable intelligence sensor structural representation,
Fig. 2 is an optical fiber power cable intelligence sensor section of structure,
Fig. 3 is an embodiment of optical-fiber intelligent sensing power cable monitoring running state device,
Among the figure: 1-optical fiber sensing probe, 2-auxiliary clamp, 3-auxiliary part, 4-optical fiber power cable intelligence sensor, 5-Transmission Fibers, 6-data analysis and treating apparatus.
Embodiment:
A kind of optical-fiber intelligent sensing power cable monitoring running state device of the present invention such as Fig. 1, Fig. 2 are shown in Figure 3, and it comprises one or more optical fiber power cable intelligence sensor 4, Transmission Fibers 5, data analysis and treating apparatus 6; To be a plurality of optical fiber sensing probes 1 utilize the parts of the similar thin wall circular structure that one or more auxiliary clamps 2 and one or more auxiliary parts 3 are packaged into along the radial and axial layering of power cable with described optical fiber power cable intelligence sensor; Be fixed on the power cable; Described a plurality of optical fiber sensing probe 1 connects described Transmission Fibers 5; Its Transmission Fibers 5 linking numbers according to one's analysis with treating apparatus 6, tested power cable temperature signal is transferred to data analysis and treating apparatus analyzing and processing Monitoring Data.
This optical-fiber intelligent sensing power cable monitoring running state device principle of work: when the power cable current-carrying; The metallic conductor of electric-cable core can generate heat; And gradually to the outer heat radiation of electric-cable core; By the optical fiber sensing probe 1 in the optical fiber power cable intelligence sensor 4, can monitor the radial and axial temperature signal of power cable in real time; When the current signal of power cable changes; The metallic conductor heating of power cable core is different; Cause the transducing signal of a plurality of optical fiber sensing probes 1 in the optical fiber power cable intelligence sensor 4 to change; And deliver to data analysis and treating apparatus 6 carries out data processing and analysis through Transmission Fibers 5, obtain power cable real time execution temperature, real-time current, overload operation state, network load state, power cable fault, power cable is stolen and electrical network phase current situation etc.
The present invention is encapsulated into a plurality of optical fiber sensing probes 1 in the optical fiber power cable intelligence sensor 4 through auxiliary clamp 2 and auxiliary part 3, and the radial and axial temperature of monitoring power cable in real time is for the temperature field of digital reconstruction power cable provides parameter.
The present invention is according to the sensitivity of physical size, shape and the structure monitoring requirement of power cable; And the needs of measurement range; Adopt different fibers sensing probe 1, auxiliary clamp 2 and auxiliary part 3 to be encapsulated in the optical fiber power cable intelligence sensor 4, make it be fit to the monitoring needs of the different electric power constructions of cable.
Data analysis among the present invention and treating apparatus 6 carry out theoretical analysis and calculating according to the actual environment and the power cable parameter of many power cables of laying; The electric load of theoretical prediction power cable; Current conditions etc. are for the actual motion status monitoring of power cable carries out Theoretical Calculation and analysis.
The data analysis of the technical scheme that the present invention adopted and treating apparatus are analyzed optical-fiber intelligent power cable sensing probe 4 Monitoring Data of many multiple spot power cable monitoring running state points; Can obtain the operational monitoring and the analysis of the running status of power cable; Such as: power cable real-time current, real time temperature, electrical network phase current, overload state, localization of fault, anti-theft antitheft, environment temperature monitoring and illegal invasion etc.; Effectively the febrile state of monitoring power cable under different loads and varying environment temperature accumulates historical technical data; The current-carrying capacity limit is analyzed, and guarantees be no more than under the situation that cable allows running temperature, bring into play to greatest extent cable transmittability, increase economic efficiency; Find the local hot spot on the cable, in time take to fall the stream cooling measure, delay the cable aging speed; The real time fail monitoring and warning is found the destruction that extraneous factor causes in the cable operational process; Power cable fire monitoring and warning; The temperature monitoring of cable splice, cable termination and warning.
Describe the present invention through embodiment below, but be not limited to embodiment.
Shown in Figure 3 is one embodiment of the present of invention, and optical-fiber intelligent sensing power cable monitoring running state device comprises three optical fiber power cable intelligence sensors 4, Transmission Fibers 5, a data analysis and a treating apparatus 6; Its three optical fiber power cable intelligence sensors link to each other with treating apparatus with data analysis through Transmission Fibers.When the power cable current-carrying; The metallic conductor of power cable core can generate heat; And,, monitor the radial and axial thermograde field signal of power cable in real time by the optical fiber sensing probe 1 in the optical fiber power cable intelligence sensor 4 gradually to the outer heat radiation of power cable cable.When the current signal of power cable changes; The metallic conductor heating of power cable core is different; Cause the sensing signal of optical fiber sensing probe 1 to change; And deliver to data analysis and treating apparatus 6 carries out data processing and analysis through Transmission Fibers 5, obtain power cable structure real-time running state.
Its method of application is following: by auxiliary clamp 2, auxiliary part 3 optical fiber power cable intelligence sensor 4 is fixed on the power cable, the optical fiber sensing probe 1 output signal in the optical fiber power cable intelligence sensor 4 is transported to data analysis and treating apparatus 6 through Transmission Fibers 5; Through data analysis and the installation environment parameter of treating apparatus 6 preset power cables and the structural parameters of power cable, the running status of Theoretical Calculation power cable; When the power cable current-carrying; The metallic conductor of power cable core can generate heat; And gradually to the outer heat radiation of power cable cable; The signal of the optical fiber sensing probe 1 in the optical fiber power cable intelligence sensor 4 changes, and carries out obtaining power cable structure real-time running state after data processing and the analysis through data analysis and treating apparatus 6.
In the use, should make 4 fixed installations of optical fiber power cable intelligence sensor steadily, avoid introducing external vibration and disturb, transducing signal is impacted.
Claims (6)
1. optical-fiber intelligent sensing power cable method for monitoring operation states; It is characterized in that; Based on the susceptibility of the Fibre Optical Sensor in the optical fiber sensing probe to temperature, stress and strain; The optical fiber power cable intelligence sensor of a plurality of optical fiber sensing probes being set up by auxiliary clamp is fixed on around the cable of power cable monitoring running state point; The running temperature situation of real-time monitoring power cable, through the temperature field of digital reconstruction power cable, real-time monitoring power cable running status and running quality.
2. optical-fiber intelligent sensing power cable monitoring running state device, it is characterized in that: it comprises one or more optical fiber power cable intelligence sensors (4), Transmission Fibers (5), data analysis and treating apparatus (6); Described optical fiber power cable intelligence sensor (4); Be the parts that utilize the similar thin wall circular structure that one or more auxiliary clamps (2) and one or more auxiliary part (3) be packaged into by a plurality of optical fiber sensing probes (1) along the radial and axial layering of power cable; Jacket is fixed on the power cable, and optical fiber sensing probe (1) the output signal in the optical fiber power cable intelligence sensor (4) is transported to data analysis and treating apparatus (6) through Transmission Fibers (5).
3. optical-fiber intelligent sensing power cable monitoring running state device according to claim 2 is characterized in that: auxiliary clamp (2), auxiliary part (3), optical fiber power cable intelligence sensor (4), Transmission Fibers (5) are designed to and tested power cable size and the required shape of actual measurement environmental requirement.
4. optical-fiber intelligent sensing power cable monitoring running state device according to claim 2 is characterized in that: optical fiber sensing probe (1), auxiliary clamp (2), auxiliary part (3), optical fiber power cable intelligence sensor (4), Transmission Fibers (5) all adopt the insulating material insulation.
5. optical-fiber intelligent sensing power cable monitoring running state device according to claim 2; It is characterized in that: according to the actual environment and the power cable of one or more power cable of laying, preset the installation environment parameter of power cable and the structural parameters of power cable in data analysis and the treating apparatus (6).
6. the method for application of the described optical-fiber intelligent sensing of claim 2 power cable monitoring running state device; It is characterized in that: optical fiber power cable intelligence sensor (4) is according to tested power cable dimensioned; And being fixed on the power cable monitoring point by auxiliary clamp (2) and auxiliary part (3), optical fiber sensing probe (1) the output signal in the optical fiber power cable intelligence sensor (4) is transported to data analysis and treating apparatus (6) through Transmission Fibers (5); Through the installation environment parameter of the preset power cable of data analysis and treating apparatus (6) and the structural parameters of power cable, the running status of Theoretical Calculation power cable; When the power cable current-carrying; The metallic conductor of power cable core can generate heat; And gradually to the outer heat radiation of power cable cable; The signal of the optical fiber sensing probe (1) in the optical fiber power cable intelligence sensor (4) changes, and carries out obtaining power cable structure real-time running state after data processing and the analysis through data analysis and treating apparatus (6).
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| CN107402338A (en) * | 2016-05-20 | 2017-11-28 | 国网天津市电力公司 | Cable electrical failure analysis methods based on distributed optical fiber temperature measurement |
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