CN107102240A - A kind of system and method for being used to carry out optical fiber composite low-voltage cable fault diagnosis - Google Patents
A kind of system and method for being used to carry out optical fiber composite low-voltage cable fault diagnosis Download PDFInfo
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- CN107102240A CN107102240A CN201710357247.2A CN201710357247A CN107102240A CN 107102240 A CN107102240 A CN 107102240A CN 201710357247 A CN201710357247 A CN 201710357247A CN 107102240 A CN107102240 A CN 107102240A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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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
Abstract
The invention discloses a kind of system for being used to carry out optical fiber composite low-voltage cable fault diagnosis, system includes：Distributed optical fiber temperature monitoring unit, the real time temperature monitoring of diverse location is carried out for the optical fiber to optical fiber composite low-voltage cable, the temperature of optical fiber diverse location is obtained, and the position of optical fiber and temperature are sent to information process unit；Environmental monitoring unit, the cable jacket temperature for obtaining optical fiber composite low-voltage cable, and cable jacket temperature is sent to information process unit；Current acquisition unit, the current-carrying capacity in actual motion of the conductor for obtaining optical fiber composite low-voltage cable, and the current-carrying capacity of actual motion is sent to information process unit；Information process unit, for being analyzed according to the position of optical fiber and the load current of temperature, cable jacket temperature and actual motion that receive, judge whether the current-carrying capacity of actual motion is more than maximum carrying capacity, if so, then optical fiber composite low-voltage cable operation troubles.
Description
Technical field
The present invention relates to electric power system power distribution technology and technical field of photo communication, it is used for more particularly, to one kind to light
Fine composite low-voltage cable carries out the system and method for fault diagnosis.
Background technology
With city net and the implementation of the upgrading of rural power grids, optical fiber composite rope OPLC (Optical fiber composite low-
Voltages cable) circuit as optic communication and network power supply transmits optical fiber composite rope circuit in main body, optical fiber network system
The amount of laying it is more and more, in particular with urban renewal and build deepen continuously, optoelectronic composite cable in the fiber optic network of city
Shared proportion is increasing, and the operational management of optical fiber composite rope, monitoring and maintenance workload also increasingly increase.
Running current and temperature are two important parameters that the operation of optical fiber composite rope is related to.When optical fiber composite rope is specified negative
When being run under lotus, core temperature reaches permissible value.Optical fiber composite rope once overloads, and core temperature will steeply rise, and accelerates
Insulation ag(e)ing, or even occur thermal breakdown.Therefore it is necessary to be controlled to the running current and temperature of optical fiber composite rope, this will
Ask fiber optic network to run department and rational management is carried out to the actual load of optical fiber composite rope.
Optical fiber composite rope type selecting and lay the stage, actual motion environment is comprehensively considered due to lacking, it is logical
All it is often to be carried out according to standard cable oversheath temperature, so optical fiber composite rope will be caused high or scattered in cable jacket temperature
Superheat state is run on when heat condition is bad, service life is reduced.Also, it is increasingly sophisticated due to network structure, due to lacking
The load of optical fiber composite rope is adjusted and dispatched, Power Communication Resources load-bearing capacity can not be not fully exerted, it is also difficult to
Solve supply of electric power assignment problem in emergency circumstances in optical fiber network system scheduling.
Current optical fiber composite rope fault pre-alarming and fault location are relied primarily on and manually investigated with special instrument, efficiency
It is very low.In order to improve the maintenance efficiency of optical fiber composite rope, it is necessary to improve optical fiber composite rope malfunction monitoring technology, be allowed to towards collection
The direction of reduction and automation is developed.Therefore, in the urgent need to the OPLC network failures that Devoting Major Efforts To Developing has independent intellectual property right are examined
Disconnected device, so that when failure occurs as early as possible and type and the place of failure should be able to be accurately determined, to faulty electro-optical composite rope
Repaired, it is ensured that optical networking proper communication is run, and its economic benefit and social influence are all very huge.
Prior art：CN:201320345836.6,《A kind of fiber optic network fault diagnosis and maintenance system based on ASP》
Utility model disclose a kind of fiber optic network fault diagnosis and maintenance system based on ASP, including connected with fiber optic network
Optical fiber distribution cabinet, the optical path switch module being connected successively with the optical fiber distribution cabinet, OTDR test modules, monitoring module, data
Storehouse server and terminal.Fiber optic network fault diagnosis and maintenance system of the prior art based on ASP, can overcome in the prior art
The scope of application is small and the defect such as positioning accuracy difference, to realize that the scope of application is big and the good advantage of positioning accuracy.But it is existing
Technology solve only the loss test problems of optic communication transmission, the problem of can not solving fiber optic network power distribution fault diagnosis.
Accordingly, it would be desirable to which a kind of technology, real-time diagnosis is carried out to realize to carrying out failure to optical fiber composite low-voltage cable.
The content of the invention
The invention provides a kind of system and method for being used to carry out optical fiber composite low-voltage cable fault diagnosis, to solve
The problem of fault diagnosis is carried out to optical fiber composite low-voltage cable.
In order to solve the above problems, it is used to carry out fault diagnosis to optical fiber composite low-voltage cable the invention provides a kind of
System, the system includes：
Distributed optical fiber temperature monitoring unit, the real-time of diverse location is carried out for the optical fiber to optical fiber composite low-voltage cable
Temperature monitoring, obtains the temperature of optical fiber diverse location, and the position of the optical fiber and temperature are sent to information process unit；
Environmental monitoring unit, the cable jacket temperature for obtaining the optical fiber composite low-voltage cable, and by the electricity
Cable oversheath temperature is sent to described information processing unit；
Current acquisition unit, the current-carrying in actual motion of the conductor for obtaining the optical fiber composite low-voltage cable
Amount, and the current-carrying capacity of the actual motion is sent to described information processing unit；
Information process unit, for according to the position of the optical fiber and temperature that receive, cable jacket temperature and
The load current of actual motion is analyzed, including：
Using the temperature of optical fiber, the cable jacket temperature, the temperature of the conductor is calculated；
Using the temperature and the functional relation of the maximum carrying capacity of the conductor of the conductor, the maximum of the conductor is calculated
Current-carrying capacity；
Judge the actual motion current-carrying capacity whether be more than the maximum carrying capacity, if so, then the optical fiber be combined it is low
Voltage cable operation troubles.
Preferably, described information processing unit passes through TCP/IP communication mode and the distributed optical fiber temperature monitoring unit
It is attached.
Preferably, described information processing unit is attached by RS485 buses with the environmental monitoring unit.
Preferably, the distributed optical fiber temperature monitoring unit is used for position and the temperature for monitoring the optical fiber in 5 kilometers.
Preferably, described information processing unit is additionally operable to, and obtains the corresponding position of the optical fiber maximum temperature, sets up described
The data relationship of the temperature of position conductor and the current-carrying capacity of actual motion.
Preferably, the temperature using the conductor and the functional relation of the maximum carrying capacity of the conductor, calculate institute
The maximum carrying capacity of conductor is stated, including：
Inversion Calculation is carried out by fourier law, the maximum carrying capacity of the conductor is calculated.
Preferably, the current acquisition unit includes current collector summation current transformer, wherein：
The current collector carries out the conversion of current-mode analog quantity sum word amount；
The current transformer is changed into measurement low current by high current is loaded.
Preferably, the distributed optical fiber temperature monitoring unit passes through internal bus and the environmental monitoring unit, power supply
Unit is attached.
Based on another aspect of the present invention, the present invention provides a kind of be used for optical fiber composite low-voltage cable progress fault diagnosis
Method, methods described includes：
The real time temperature monitoring of diverse location is carried out to the optical fiber of optical fiber composite low-voltage cable, optical fiber diverse location is obtained
Temperature；
Obtain the cable jacket temperature of the optical fiber composite low-voltage cable；
Obtain the current-carrying capacity in actual motion of the conductor of the optical fiber composite low-voltage cable；
Using the temperature and the functional relation of the maximum carrying capacity of the conductor of the conductor, the maximum of the conductor is calculated
Current-carrying capacity；
Judge the actual motion current-carrying capacity whether be more than the maximum carrying capacity, if so, then the optical fiber be combined it is low
Voltage cable operation troubles.
Preferably, the temperature of the optical fiber is transmitted by TCP/IP communication mode.
Preferably, the cable jacket temperature is transmitted by RS485 buses.
Preferably, for monitor 5 kilometers in optical fiber position and temperature.
Preferably, the corresponding position of the optical fiber maximum temperature is obtained, the temperature for setting up the position conductor is transported with actual
The data relationship of capable current-carrying capacity.
Preferably, the temperature using the conductor and the functional relation of the maximum carrying capacity of the conductor, calculate institute
The maximum carrying capacity of conductor is stated, including：
Inversion Calculation is carried out by fourier law, the maximum carrying capacity of the conductor is calculated.
Technical scheme provides a kind of system for being used to carry out optical fiber composite low-voltage cable fault diagnosis, should
System is divided according to the cable jacket temperature of the temperature of collection optoelectronic composite cable optical fiber, cable running current and cabling
The conductor temperature of cable is analysed, calculated, the current-carrying capacity by conductor is calculated by conductor temperature, and according to fiber optic temperature, fortune
Relation between row electric current and cable oversheath temperature, analyzes the operation safe condition of OPLC composite ropes, makes to match somebody with somebody electric light net
Network has more preferably stability and reliability.
Brief description of the drawings
By reference to the following drawings, the illustrative embodiments of the present invention can be more fully understood by：
Fig. 1 is according to a kind of for being of an embodiment of the present invention to optical fiber composite low-voltage cable progress fault diagnosis
System structure chart；
Fig. 2 is the single-core cable equivalence according to an embodiment of the present invention；
Fig. 3 is the three-core cable equivalence according to an embodiment of the present invention；And
Fig. 4 is a kind of side for being used to carry out optical fiber composite low-voltage cable fault diagnosis according to an embodiment of the present invention
Method flow chart.
Embodiment
The illustrative embodiments of the present invention are introduced with reference now to accompanying drawing, however, the present invention can use many different shapes
Formula is implemented, and it is to disclose at large and fully there is provided these embodiments to be not limited to embodiment described herein
The present invention, and fully pass on the scope of the present invention to person of ordinary skill in the field.For showing for being illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements are attached using identical
Icon is remembered.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has to person of ordinary skill in the field
It is common to understand implication.Further it will be understood that the term limited with usually used dictionary, is appreciated that and it
The linguistic context of association area has consistent implication, and is not construed as Utopian or excessively formal meaning.
Fig. 1 is according to a kind of for being of an embodiment of the present invention to optical fiber composite low-voltage cable progress fault diagnosis
System structure chart.The optical fiber composite low-voltage cable OPLC running statuses that embodiment of the present invention provides a kind of power system are commented
Estimate, the Network Fault Diagnosis Technique and device of the fiber to the home FTTH O＆Ms of fault diagnosis and passive network PON.As schemed
Shown in 1, optical fiber composite low-voltage cable OPLC network fault diagnosis systems 100 are by information process unit, DTS distributed fiber optic temperatures
Monitoring unit 101, environmental monitoring unit 102, power module, current acquisition unit 103 are constituted.It is combined by the photoelectricity of collection low
The current-carrying capacity and cable jacket temperature data of electric current are divided when the fibre core temperature of voltage cable diverse location, cable conductor are run
Analysis, calculates the temperature and changing rule of conductor.Information process unit monitoring distributed optical fiber temperature monitoring unit 101, environment
The metrical information of monitoring unit 102 and current acquisition unit 103, and by the fibre core of optical fiber, the temperature information of wire, comment
Estimate the operation safe condition and fault message of optical fiber composite low-voltage cable OPLC wires, optical fiber, it is possible to failure happening part
Positioned.
A kind of system 100 for being used to carry out optical fiber composite low-voltage cable fault diagnosis that embodiment of the present invention is provided,
Including：
Distributed optical fiber temperature monitoring unit 101, diverse location is carried out for the optical fiber to optical fiber composite low-voltage cable
Real time temperature monitoring, obtains the temperature of optical fiber diverse location, and the position of optical fiber and temperature are sent to information process unit.
Environmental monitoring unit 102, the cable jacket temperature for obtaining optical fiber composite low-voltage cable, and will be protected outside cable
Sleeving temperature is sent to information process unit.
Current acquisition unit 103, the current-carrying capacity in actual motion of the conductor for obtaining optical fiber composite low-voltage cable,
And send the current-carrying capacity of actual motion to information process unit.
Information process unit 104, for the position according to the optical fiber received and temperature, cable jacket temperature and reality
The load current of border operation is analyzed, including：
Using cable jacket temperature, the temperature of conductor is calculated；Utilize the temperature and the maximum carrying capacity of conductor of conductor
Functional relation, calculates the maximum carrying capacity of conductor；Judge whether the current-carrying capacity of actual motion is more than maximum carrying capacity, if so, then
Optical fiber composite low-voltage cable operation troubles.Preferably, information process unit passes through TCP/IP communication mode and distribution type fiber-optic temperature
Degree monitoring unit is attached.
Preferably, information process unit is attached by RS485 buses and environmental monitoring unit.
Preferably, distributed optical fiber temperature monitoring unit is used for position and the temperature for monitoring the optical fiber in 5 kilometers.
Preferably, information process unit is additionally operable to, and is obtained the corresponding position of optical fiber maximum temperature, is set up the temperature of position conductor
The data relationship of degree and the current-carrying capacity of actual motion.
Preferably, using conductor temperature and conductor maximum carrying capacity functional relation, calculate conductor maximum current-carrying
Amount, including：
Inversion Calculation is carried out by fourier law, the maximum carrying capacity of conductor is calculated.
Preferably, current acquisition unit includes current collector summation current transformer, wherein：Current collector carries out electric current
The conversion of analog quantity and digital quantity；Current transformer is changed into measurement low current by high current is loaded.
Preferably, distributed optical fiber temperature monitoring unit is carried out by internal bus and environmental monitoring unit, power subsystem
Connection.
Embodiments of the present invention are illustrated below：
Optical fiber composite low-voltage cable OPLC carries out the system of fault diagnosis by information process unit 104, display unit, DTS
Distributed optical fiber temperature monitoring unit 101, environmental monitoring unit 102, power subsystem, current acquisition unit 103, it is preferable that electricity
Flow collecting unit 103 and include two parts of current collector summation current transformer.Current collector realize electric current analog quantity and
Conversion between digital quantity；Current transformer is realized is transformed into measuring low current by load high current.
Information process unit 104 is used for, and the conductor temperature of cable is calculated using the cable oversheath temperature of collection,
According to conductor temperature and current-carrying capacity functional relation, the current-carrying capacity by conductor, equation below 1 to formula 4 are calculated.Pass through distribution
Formula optical fiber temperature monitoring unit provides the maximum temperature of cable optic fibre correspondence subregion, and providing cable by current acquisition unit runs
Electric current.By the temperature of the optoelectronic composite cable optical fiber diverse location gathered in real time, by distributed optical fiber temperature measurement module, current acquisition
Unit and cable jacket temperature collecting cell provide cable operation security state evaluation, and are shown by display unit progress data
Show.
The current-carrying magnitude relation of conductor temperature and conductor is calculated by Re Lufa.Heat of the Re Lufa by the function of current in cable is put down
Look horizontally as the heat flow field of one-dimensional form, solve conductor temperature using the fourier law similar to Ohm's law in circuit, pass through
Conductor temperature calculates current-carrying capacity of cable (international standard IEC60287).The problem of field is converted into road by this method, simplifies computing.
Fig. 2 is the equivalent thermal circuits of single-core cable, and conductor temperature and current-carrying capacity prediction calculation formula are：
Tc=T0+Wc[T1+(1+λ1)T2+(1+λ1+λ2)T3]+Wd(0.5T1+T2+T3)
Formula 1,
In known conductor maximum operating temperature Tc maxIn the case of, longtime running current-carrying capacity I can be derived by formula (1)a
Fig. 3 is the equivalent thermal circuits of three-core cable, and conductor temperature and current-carrying capacity prediction calculation formula are：
Tc=T0+Wc[T1+(1+λ1)3T2+(1+λ1+λ2)3T3]+Wd(0.5T1+3T2+3T3)
Formula 3,
Wherein, TCFor cable conductor temperature, unit is K；T0For cable laying environment ambient temperature, unit is K；WcFor electricity
Cable conductor losses, unit is W/m；WdThe dielectric loss for the unit length that insulated for cable conductor, unit is W/m；λ1For cable metal
Ratio of the set loss relative to all conductor total losses；λ2The ratio relative to all conductor total losses is lost for cable sheath
Rate；T1For a unit length thermal resistance between conductor and metallic sheath, unit is Km/W；T2Protected to be interior between metallic sheath and armouring
Layer unit length thermal resistance, unit is Km/W；T3For protective coverings of cable unit length thermal resistance, unit is Km/W.
Provided according to GB/T29839 rated voltages 1kV and following optical fiber composite low-voltage cable, be poly- record second in insulating materials
During alkene, normal working temperature is no more than 70 DEG C,；When insulating materials is crosslinked polyethylene, normal working temperature is no more than 90 DEG C；
Fiber attenuation coefficient, in 1310nm, not higher than 0.4dB, in 1550nm, not higher than 0.3dB；Feelings beyond above range
Condition, is considered faulty.
By experiment set up cable oversheath temperature, running current and ideally distribution type fiber-optic gather electricity
The data relationship of following structure between cable temperature Tc three.
Table 1 certain OPLC running current, cable jacket temperature and collecting fiber cable temperature relation
According to the state magnitude relation of table 1, preferable feelings are found out using cable jacket temperature Tn, the running current Im of collection
Cable temperature Tc under condition, the actual motion cable temperature Tf that cable temperature-measuring optical fiber is gathered and the ideally survey found out
Warm fiber optic cables temperature Tc is contrasted, and calculates difference therebetween, and the operation safety of cable is assessed according to this difference
State, symbol X represents measurement optical fiber Tc.
Information process unit 104 is connected with display unit, and information process unit 104 is supervised with DTS distributed fiber optic temperatures
Survey unit 101 to connect by TCP/I P communication modes, information process unit 104 passes through with environmental monitoring unit 102
RS485 buses are connected.
DTS distributed optical fiber temperature monitorings unit 101 is used to monitor the cable that OPLC cables are radially no less than 5 kilometers in real time
Distributed continuous temperature data, positioning precision is high.
Environmental monitoring unit 102 is used for the operation cable jacket temperature for monitoring optoelectronic composite cable.
Preferably, power subsystem is used to provide power supply and protection for optical fiber composite low-voltage cable progress fault diagnosis system.
DTS distributed optical fiber temperature monitorings unit 101, environmental monitoring unit 102, power subsystem pass through DTS internal bus
Connect and realize overall-in-one control schema function.
Preferably, current acquisition unit 103 includes current collector summation current transformer, and wherein current collector carries out electricity
The conversion of flow field simulation amount and digital quantity；Current transformer is changed into measurement low current by high current is loaded.
Information process unit 104 is used for the temperature for the optoelectronic composite cable optical fiber diverse location that will be gathered in real time, conductor in reality
Current-carrying capacity and cable jacket temperature data when border is run are analyzed, and are calculated the temperature of the conductor of cable, are passed through conductor
Temperature calculate current-carrying capacity by conductor, and provide the maximum temperature of cable optic fibre correspondence position subregion, the operation of conductor
Relation between temperature and the running current of conductor.
Fig. 4 is a kind of side for being used to carry out optical fiber composite low-voltage cable fault diagnosis according to an embodiment of the present invention
Method flow chart.As shown in figure 4, method 400 is since step 401：
Preferably, in step 401：The real time temperature monitoring of diverse location is carried out to the optical fiber of optical fiber composite low-voltage cable,
Obtain the temperature of optical fiber diverse location.
Preferably, in step 402：Obtain the cable jacket temperature of optical fiber composite low-voltage cable.
Preferably, in step 403：Obtain the current-carrying capacity in actual motion of the conductor of optical fiber composite low-voltage cable.
Preferably, in step 404：The structural parameters and cable jacket temperature of OPLC cables are obtained, the temperature of conductor is calculated
Degree；
Preferably, in step 405：Using conductor temperature and conductor maximum carrying capacity functional relation, calculate conductor
Maximum carrying capacity；
Preferably, in step 406：Judge whether the current-carrying capacity of actual motion is more than maximum carrying capacity, if so, then optical fiber is answered
Close low-voltage cable operation troubles.
Preferably, distributed optical fiber temperature monitoring unit is transmitted at temperature to the information of optical fiber by TCP/IP communication mode
Manage unit.
Preferably, environmental monitoring unit transmits cable jacket temperature to information process unit by RS485 buses.
Preferably, distributed optical fiber temperature monitoring unit is used for position and the temperature for monitoring the optical fiber in 5 kilometers.It is preferred that
Ground, information process unit obtains the corresponding position of optical fiber maximum temperature, sets up the temperature of position conductor and the current-carrying of actual motion
The data relationship of amount.
Preferably, information process unit utilizes the functional relation of the temperature of conductor and the maximum carrying capacity of conductor, and calculating is led
The maximum carrying capacity of body, including：
Inversion Calculation is carried out by fourier law, the maximum carrying capacity of conductor is calculated.
The present invention is described by reference to a small amount of embodiment.However, it is known in those skilled in the art, as
What subsidiary Patent right requirement was limited, except the present invention other embodiments disclosed above equally fall the present invention's
In the range of.
Normally, all terms used in the claims are all solved according to them in the usual implication of technical field
Release, unless clearly defined in addition wherein.All references " one/described/be somebody's turn to do [device, component etc.] " are all opened ground
At least one example in described device, component etc. is construed to, unless otherwise expressly specified.Any method disclosed herein
Step need not all be run with disclosed accurate order, unless explicitly stated otherwise.
Claims (14)
1. a kind of system for being used to carry out optical fiber composite low-voltage cable fault diagnosis, the system includes：
Distributed optical fiber temperature monitoring unit, the real time temperature of diverse location is carried out for the optical fiber to optical fiber composite low-voltage cable
Monitoring, obtains the temperature of optical fiber diverse location, and the position of the optical fiber and temperature are sent to information process unit；
Environmental monitoring unit, the cable jacket temperature for obtaining the optical fiber composite low-voltage cable, and by outside the cable
Sheath temperature is sent to described information processing unit；
Current acquisition unit, the current-carrying capacity in actual motion of the conductor for obtaining the optical fiber composite low-voltage cable, and
The current-carrying capacity of the actual motion is sent to described information processing unit；
Information process unit, for the position according to the optical fiber received and temperature, cable jacket temperature and reality
The load current of operation is analyzed, including：
Using the temperature of optical fiber, the cable jacket temperature, the temperature of the conductor is calculated；
Using the temperature and the functional relation of the maximum carrying capacity of the conductor of the conductor, the maximum current-carrying of the conductor is calculated
Amount；
Judge whether the current-carrying capacity of the actual motion is more than the maximum carrying capacity, if so, the then fiber composite low-voltage electricity
Cable operation troubles.
2. system according to claim 1, described information processing unit passes through TCP/IP communication mode and the distribution
Optical fiber temperature monitoring unit is attached.
3. system according to claim 1, described information processing unit passes through RS485 buses and the environmental monitoring unit
It is attached.
4. system according to claim 1, the distributed optical fiber temperature monitoring unit is used to monitor the optical fiber in 5 kilometers
Position and temperature.
5. system according to claim 1, described information processing unit is additionally operable to, the optical fiber maximum temperature correspondence is obtained
Position, set up the data relationship of the temperature of the position conductor and the current-carrying capacity of actual motion.
6. system according to claim 1, the temperature using the conductor and the maximum carrying capacity of the conductor
Functional relation, calculates the maximum carrying capacity of the conductor, including：
Inversion Calculation is carried out by fourier law, the maximum carrying capacity of the conductor is calculated.
7. system according to claim 1, the current acquisition unit includes current collector summation current transformer, its
In：
The current collector carries out the conversion of current-mode analog quantity sum word amount；
The current transformer is changed into measurement low current by high current is loaded.
8. system according to claim 1, the distributed optical fiber temperature monitoring unit passes through internal bus and the ring
Border monitoring unit, power subsystem are attached.
9. a kind of method for being used to carry out optical fiber composite low-voltage cable fault diagnosis, methods described includes：
The real time temperature monitoring of diverse location is carried out to the optical fiber of optical fiber composite low-voltage cable, the temperature of optical fiber diverse location is obtained
Degree；
Obtain the cable jacket temperature of the optical fiber composite low-voltage cable；
Obtain the current-carrying capacity in actual motion of the conductor of the optical fiber composite low-voltage cable；
Using the temperature and the functional relation of the maximum carrying capacity of the conductor of the conductor, the maximum current-carrying of the conductor is calculated
Amount；
Judge whether the current-carrying capacity of the actual motion is more than the maximum carrying capacity, if so, the then fiber composite low-voltage electricity
Cable operation troubles.
10. method according to claim 9, the temperature of the optical fiber is transmitted by TCP/IP communication mode.
11. method according to claim 9, the cable jacket temperature is transmitted by RS485 buses.
12. method according to claim 9, position and temperature for monitoring the optical fiber in 5 kilometers.
13. method according to claim 9, obtains the corresponding position of the optical fiber maximum temperature, sets up the position and lead
The data relationship of the temperature of body and the current-carrying capacity of actual motion.
14. method according to claim 9, the temperature using the conductor and the maximum carrying capacity of the conductor
Functional relation, calculates the maximum carrying capacity of the conductor, including：
Inversion Calculation is carried out by fourier law, the maximum carrying capacity of the conductor is calculated.
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| CN108280311A (en) * | 2018-02-11 | 2018-07-13 | 国网吉林省电力有限公司电力科学研究院 | Twisted polyethylene cable whether the diagnostic method and diagnostic system of safe operation |
| CN108445332A (en) * | 2018-06-13 | 2018-08-24 | 国家电网有限公司 | A kind of cable operating status on-line monitoring system |
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| CN110793616A (en) * | 2019-10-25 | 2020-02-14 | 深圳第三代半导体研究院 | All-fiber distributed cable safety and reliability monitoring system |
| CN111256805A (en) * | 2020-01-06 | 2020-06-09 | 武汉理工光科股份有限公司 | Method and system for transversely positioning vibration source of distributed optical fiber vibration sensor |
| CN111323678A (en) * | 2020-03-09 | 2020-06-23 | 浙江日新电气有限公司 | Power cable abnormality detection method and system and distributed optical fiber temperature measurement host |
| CN114598388A (en) * | 2022-03-16 | 2022-06-07 | 广东电网有限责任公司 | Online monitoring system and method for circuit optical cable |
| CN117213561A (en) * | 2023-11-08 | 2023-12-12 | 广东电网有限责任公司佛山供电局 | Power line monitoring method and system applied to optical fiber sensor |
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