CN102636730B - Temperature rise strain monitoring and alarming and fault analysis method for composite submarine cable - Google Patents

Temperature rise strain monitoring and alarming and fault analysis method for composite submarine cable Download PDF

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Publication number
CN102636730B
CN102636730B CN201210041094.8A CN201210041094A CN102636730B CN 102636730 B CN102636730 B CN 102636730B CN 201210041094 A CN201210041094 A CN 201210041094A CN 102636730 B CN102636730 B CN 102636730B
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China
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cable
temperature
extra
strain
composite sea
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CN201210041094.8A
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CN102636730A (en
Inventor
安博文
王新华
陈元林
刘进辉
王晓峰
高红武
刘频频
周蓉蓉
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上海海事大学
中国海洋石油总公司
中海油能源发展股份有限公司
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Abstract

The invention discloses a temperature rise strain monitoring and alarming and fault analysis method for a composite submarine cable. The method comprises the following steps of: performing real-time temperature stress sensing on the composite submarine cable by utilizing abundant single mode fibers in a submarine cable, and evaluating the safety state of the composite submarine cable according to a power supply harmonic test parameter to realize real-time monitoring of the composite submarine cable. According to the method disclosed by the invention, real-time distributive safety monitoring and alarming can be performed on the composite submarine cable, and the safety sate of the composite submarine cable is judged according to the monitored power grid quality parameter, communication optical fiber excited brillouin reflection frequency offset and calibration data; and the fault analysis is performed on the composite submarine cable having a fault to find out the main reason of the fault.

Description

Composite sea cable temperature rise strain monitoring alarm and failure analysis methods
Technical field
The present invention relates to the monitoring technology of composite sea cable, be specifically related to composite sea cable in real time, distributed security monitoring alarm, the safe condition according to power grid quality parameter, telecommunication optical fiber excited Brillouin reflection frequency side-play amount and the calibration data of monitoring to the seabed composite cable judges; And the composite sea cable broken down is carried out to fault analysis, distinguish the main cause that causes fault.
Background technology
Existing seabed composite cable adopts deposited buried mode to tackle the destruction that the external force such as ship anchor, fishing gear trawlnet may cause, after subsea cable breaks down, utilize optical fiber Brillouin scattering testing apparatus to the test of the telecommunication optical fiber in composite sea cable, keeped in repair behind definite position of breaking down.
Current in-service composite sea cable only has the power quality monitoring, lack and detect for the thermal breakdown fault that internal factor causes because extra large cable insulation course is aging, supply harmonic is too high, intermediate head is bad or mains fluctuations, load are overweight etc., to the extra large cable that thermal breakdown occurs, can't find out the fault cause; And extra large cable strain initial stage that external force is caused lacks the monitoring alarm, therefore, need to set up the composite sea cable monitoring system, to extra large cable working status initial failure Real-Time Monitoring particularly, and can find out failure cause to the extra large cable broken down according to the data of preserving.
Summary of the invention
The present invention is directed in prior art the temperature rise of extra large cable abnormal, stress deformation are lacked to monitoring measure, its safe condition is unpredictable, can't locate the problems such as the position of breaking down, and a kind of composite sea cable temperature rise strain monitoring alarm and failure analysis methods are provided.This method can realize that extra large cable working status patrols and examines, and temperature and the stress deformation of composite sea cable are monitored in real time, according to Monitoring Data, to the safe condition of extra large cable, gives judgement; In addition, when extra large cable breaks down, can utilize this method to determine abort situation.
In order to achieve the above object, the present invention adopts following technical scheme:
Composite sea cable temperature rise strain monitoring alarm and failure analysis methods, described method utilizes unnecessary single-mode fiber to carry out the real time temperature stress sensing to composite sea cable, and in conjunction with the supply harmonic test parameter, the safe condition of composite sea cable is provided to evaluation, realize the real-time monitoring to composite sea cable.
In example of the present invention, the concrete steps of described method are as follows:
(1) according to composite sea cable physical arrangement size, set up the physical arrangement model;
(2) set up extra large cable models for temperature field and strain field model according to the nature parameters of each component of composite sea cable;
(3), according to physical arrangement model, models for temperature field, generate composite sea cable fiber optic temperature and cable temperature correspondence database, i.e. extra large cable temperature Query Database;
(4) set up strain-Brillouin scattering correspondence database according to strain field model and optical fiber Brillouin scattering tester characteristic, i.e. extra large cable strain Query Database;
(5) utilize the basic Brillouin scattering data of optical fiber Brillouin scattering tester under the different operating environment, set up the calibration data storehouse, be i.e. extra large cable calibration basic database;
(6) skew of Brillouin's frequency, two kinds of parameters of supply harmonic while utilizing optical fiber Brillouin scattering tester, the work of supply harmonic testing apparatus Real-Time Monitoring composite sea cable;
(7) Brillouin's frequency skew of optical fiber Brillouin scattering tester being obtained is compared with extra large cable temperature Query Database, extra large cable strain Query Database, extra large cable calibration basic database, draw cable position temperature, strain in composite sea cable, and suppose that it is the temperature elevation process that the Brillouin's frequency got is offset corresponding physical process;
(8) according to the temperature regional characteristic distributions that raises, differentiation causes that the cause of frequency shift (FS) is that outer stress-strain or composite sea cable temperature raise: if in temperature rising zone centered by somewhere point, be symmetric, the intermediate point frequency offset is large, little away from the skew of this frequency deviation, length surpasses meter level, determines it is that outer stress-strain causes frequency shift (FS); If temperature raises, zone is to raise completely or local rising, significantly symmetrical during local the rising, determines it is that the rising of composite sea cable temperature causes frequency shift (FS);
(9), the cable temperature data and the calibration data storehouse that obtain are compared during the frequency shift (FS) cause if the composite sea cable temperature raises, obtained composite sea cable distributed temperature situation of change, the submarine cable safety state is judged;
(10), if during the frequency shift (FS) that outer stress-strain causes, carry out alarm prevention and further worsen and damage composite sea cable;
(11) when damaging appears in extra large cable, the layout structure that the positional information of utilizing optical fiber Brillouin scattering tester to measure interweaves in conjunction with extra large cable, draw the physical location of trouble spot.
Further, described extra large cable models for temperature field is set up by the following method:
(1) enter program of finite element, the defined analysis filename;
(2) definition unit type: confirm the models for temperature field elementary cell;
(3) definition material Thermal Parameter: the thermal conductivity of each composition material;
(4) set up geometric model;
(5) material properties is set;
(6) grid division;
(7) apply heat and generate load;
(8) apply extra large cable surface convection heat transfer load;
(9) arrange and solve option;
(10) solve aftertreatment and obtain the hot Temperature Distribution of composite sea cable;
(11) obtain the frequency shift (FS) data that optical fiber Brillouin scattering tester obtains;
(12) determine and draw temperature value Δ f according to the skew of optical fiber backscatter frequency and temperature, strain stress relation formula:
Δ f=C 1* Δ T+C 2* ε, Δ T is the temperature rise, ε is dependent variable, C 1, C 2for coefficient;
(13) carrying out place when experiment ε after the modeling and simulating of temperature field is zero, accordingly, and can unique definite temperature and frequency shift (FS) corresponding relation;
(14) data that contrast test data and finite element analysis obtain, adopt material surface convection coefficient in minimum mean-squared error criterion correction step (8);
(15) repeating step (8)-(13), until analysis data and test data difference meet threshold condition, modeling finishes.
Further, when the skew of the Brillouin frequency of described step (6) when the Real-Time Monitoring composite sea cable is worked, supply harmonic parameter, by single mode telecommunication optical fiber in composite sea cable, to an end short circuit, an other end is connected to optical fiber Brillouin scattering tester laser output, forms closed-loop path; The supply harmonic testing apparatus is connected with the power cable of composite sea cable simultaneously.
Further, in described step (9), the flow process of judgement submarine cable safety state is as follows:
(1) obtain the real time data of composite sea cable monitoring from optical fiber Brillouin scattering tester;
(2) real time data of tester being obtained and extra large cable calibration basic data are delivered to temperature field modeling, strain field model database, by the mode of tabling look-up, obtain current whether occur doubtful temperature rising or strain increase;
(3) if do not occur that doubtful temperature raises or strain increases situation, continue monitoring, repeat (1) and (2), and judge that extra large cable is in a safe condition;
(4), as occurred that doubtful temperature raises or strain increases, the contiguous historical data of readjustment is also obtained doubtful fault zone real time data continuously;
(5) judge doubtful fault zone characteristic of spatial distribution according to optical fiber Brillouin scattering tester real time data: be local fault or global fault;
(6) local fault in this way, whether fault zone surpasses the threshold length (being generally 10 meters) of setting, if surpass threshold value, judges that strain has occurred extra large cable; By inquiring about extra large cable strain Query Database, obtain extra large cable degree of strain, as strain continues to increase and reaches setting threshold, judge that extra large cable, in unsafe condition, sends alarm;
(7), if doubtful fault zone length is less than setting threshold, judge that the local temperature rising has occurred extra large cable; By inquiring about extra large cable temperature Query Database, obtain extra large cable temperature rising situation, as temperature continues to increase and reaches setting threshold, judge that extra large cable, in unsafe condition, sends alarm;
(8) if the temperature rising completely of extra large cable is judged by global fault, by inquiring about extra large cable temperature Query Database, obtain extra large cable temperature rising situation, as temperature continues to increase and reaches setting threshold, judge that extra large cable, in unsafe condition, sends alarm.
Further, when damaging appears in extra large cable, according to the characteristic distributions in step (8), distinguish outer stress-strain damage and composite sea cable heating damage in described step (11).
Further, when the composite sea cable heating damages, by Monitoring Data and Temperature Modeling result, distinguish heating, local pyrexia completely; If adstante febre, call the data judgement supply harmonic component that the harmonic wave tester obtains completely, judging whether transfinites, as transfinites, and fault causes because of harmonic wave; As do not transfinite, be that the power supply overvoltage causes heating; If the heating of local line territory, obtain this position voltage information in conjunction with the harmonic wave tester, the judgement thermal breakdown damages the reason caused, if voltage is normal, by cable is aging, causes thermal breakdown; If voltage is undesired, by overvoltage, cause thermal breakdown.
The present invention who obtains according to such scheme is monitored working temperature, stress deformation and the supply harmonic of composite sea cable, according to record data, generation thermal breakdown possibility, outside destroy is carried out to quantitative test, and Real-time Alarm; The extra large cable fault that irresistible factor is caused is analyzed, and finds out the fault main cause.
The accompanying drawing explanation
Further illustrate the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 is process flow diagram of the present invention.
The modeling process flow diagram that Fig. 2 is extra large cable models for temperature field in the present invention.
The decision flow chart that Fig. 3 is submarine cable safety state in the present invention.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
Comprise power cable and single mode telecommunication optical fiber in composite sea cable, power cable is for the electric power transfer between production vessel, and single-mode fiber is realized long haul communication.While manufacturing extra large cable, telecommunication optical fiber quantity generally has 20% allowance, and the present invention utilizes unnecessary single-mode fiber to carry out the temperature stress sensing, and in conjunction with the supply harmonic test parameter, the safe condition of composite sea cable is provided to evaluation.
Based on above-mentioned principle, specific embodiment of the invention following (referring to Fig. 1):
1, obtain composite sea cable physical arrangement size, set up the physical arrangement model of composite sea cable, the foundation of this model is as follows:
(1) take that 185+SM2 * (15+1) structural representation and the physical dimension table of C XLPE composite sea cable are reference;
(2) determine the home position of 3 cables and optical cable;
(3), in finite element analysis software, draw successively the right cylinder that represents conductor, conductor shielding, insulation, insulation shielding, semiconductor waterstop, plumbous cover, PE inner sheath in 3 cable cables;
(4) draw successively the right cylinder that represents optical fiber, fine cream, stainless-steel tube, PE sheath in optical cable;
(5) draw successively the right cylinder that represents gluing strap, pp bed course, wire armoring, dipping serving; Physical size in kind is loyal in described physical arrangement modeling.
2, obtain the parameter such as density, specific heat, thermo-contact coefficient, elastic modulus, Poisson ratio, linear expansion coefficient, the coefficient of heat convection of each component of composite sea cable, set up composite sea cable models for temperature field and strain field model.
Referring to Fig. 2, the composite sea cable models for temperature field is set up by the following method:
(1) enter program of finite element, the defined analysis filename;
(2) definition unit type: confirm the models for temperature field elementary cell;
(3) definition material Thermal Parameter: the thermal conductivity of each composition material;
(4) set up geometric model;
(5) material properties is set;
(6) grid division;
(7) apply heat and generate load;
(8) apply extra large cable surface convection heat transfer load;
(9) arrange and solve option;
(10) solve aftertreatment and obtain the hot Temperature Distribution of composite sea cable;
(11) obtain the frequency shift (FS) data that optical fiber Brillouin scattering tester obtains;
(12) determine and draw temperature value Δ f according to the skew of optical fiber backscatter frequency and temperature, strain stress relation formula:
Δ f=C 1* Δ T+C 2* ε, Δ T is the temperature rise, ε is dependent variable, C 1, C 2for coefficient;
(13) carrying out place when experiment ε after the modeling and simulating of temperature field is zero, accordingly, and can unique definite temperature and frequency shift (FS) corresponding relation;
(14) data that contrast test data and finite element analysis obtain, adopt material surface convection coefficient in minimum mean-squared error criterion correction step (8);
(15) repeating step (8)-(13), until analysis data and test data difference meet threshold condition, modeling finishes.
Inquiry power cable frequently-used data Fact Book, obtain and represent conductor, conductor shielding, insulation, insulation shielding, semiconductor waterstop, plumbous cover, PE inner sheath in 3 cable cables, represent optical fiber, fine cream, stainless-steel tube, PE sheath in optical cable, the heat-conduction coefficient of the material therefor of gluing strap, pp bed course, wire armoring, dipping serving, determine the convection transfer rate scope of air and seawater, in finite element analysis software, input above two kinds of parameters, according to abovementioned steps, carry out modeling analysis.
For the stress field modeling, adopt Abaqus finite element analysis principle to carry out modeling.
Abaqus software carries out finite element analysis and comprises three key steps: pre-treatment, analytical calculation and aftertreatment.
The model of pre-treatment definition physical problem, and generate an input file, analytical calculation solves defined numerical model in input file, operation in back way usually, and analysis result is kept in binary file, so that aftertreatment.Completing the required time of solution procedure depends on the complexity of problem and the arithmetic capability of computing machine.Aftertreatment is used for reading in analysis result data, with several different methods display analysis result, comprises color cloud picture, animation, deformation pattern and XY curve map etc.
Concrete modeling process is as follows:
(1) start finite element software;
(2) create three-dimensional model;
(3) create material and cross section attribute;
(4) definition assembly parts;
(5) analysis step is set;
(6) definition load and boundary condition;
(7) grid division;
(8) submit to and analyze operation;
(9) aftertreatment.
3,, according to physical arrangement model, models for temperature field, generate composite sea cable fiber optic temperature and cable temperature correspondence database, i.e. extra large cable temperature Query Database.
In this step, the generative process of extra large cable temperature Query Database comprises following core data form:
(1) generate the cable copper core of composite sea cable at varying environment temperature table corresponding to fiber optic temperature;
(2) generate the cable copper core of composite sea cable under Different working years table corresponding to fiber optic temperature;
(3) generate composite sea cable in varying environment the cable copper core table corresponding to fiber optic temperature to flowing down;
(4) generate the cable copper core of composite sea cable under different operating electric current table corresponding to fiber optic temperature;
(5) generate the cable copper core table corresponding to fiber optic temperature in composite sea cable local pyrexia situation.
4, set up strain-Brillouin scattering correspondence database according to strain field model and optical fiber Brillouin scattering tester characteristic, i.e. extra large cable strain Query Database.
Set up respectively for this database the extra large cable model that difference varies in size under the direction stressing conditions, through aftertreatment, generate the stress deformation under the different sizes of composite sea cable, direction---the corresponding table of spectrum offset.
5, by single mode telecommunication optical fiber in composite sea cable to an end short circuit, an other end is connected to optical fiber Brillouin scattering tester laser output, forms closed-loop path.
6, the supply harmonic testing apparatus is connected with the power cable of composite sea cable.
7, utilize the basic Brillouin scattering data under optical fiber Brillouin scattering tester different operating environment, set up the calibration data storehouse, be i.e. extra large cable calibration basic database.
This database is by the modeling of aforesaid temperature field and strain modeling, obtain in strain and the temperature field of the extra large cable of different weather condition, varying environment temperature, different current speed, different cross-ventilation speed, Different working years, composite sea cable under the different operating electric current and distribute, by contrast optical fiber Brillouin scattering tester field test data, obtain various conditions plunge into the commercial sea cable temperature data, extra large cable strain data, the core parameter that these data are composite sea cable calibration data storehouse.
The skew of Brillouin's frequency, two kinds of parameters of supply harmonic while 8, utilizing optical fiber Brillouin scattering tester, the work of supply harmonic tester Real-Time Monitoring composite sea cable.
9, Brillouin's frequency of optical fiber Brillouin scattering tester being obtained is offset and compares with extra large cable temperature Query Database, extra large cable strain Query Database, extra large cable calibration basic database, draws cable position temperature, strain in composite sea cable.
10, Brillouin's frequency of at first optical fiber Brillouin scattering tester being obtained is offset corresponding physical process and is assumed to the process that temperature raises; According to the temperature regional characteristic distributions that raises, differentiation causes that the cause of frequency shift (FS) is that outer stress-strain or temperature raise: if in temperature rising zone centered by somewhere point, be symmetric, the intermediate point frequency offset is large, little away from the skew of this frequency deviation, length surpasses meter level, determines it is that outer stress-strain causes frequency shift (FS); If temperature raises, zone is to raise completely or local rising, significantly symmetrical during local the rising, determines it is that the rising of composite sea cable temperature causes frequency shift (FS).
11, be, while by the rising of composite sea cable temperature, causing the Brillouin frequencies skew, the cable temperature data and the calibration data storehouse that obtain to be compared when determining, obtain extra large cable distributed temperature situation of change, the submarine cable safety state is judged.
Referring to Fig. 3, the flow process in this step, the submarine cable safety state judged is as follows:
(1) obtain the real time data of composite sea cable monitoring from optical fiber Brillouin scattering tester;
(2) real time data of tester being obtained and extra large cable calibration basic data are delivered to temperature field modeling, strain field model database, by the mode of tabling look-up, obtain current whether occur doubtful temperature rising or strain increase;
(3) if do not occur that doubtful temperature raises or strain increases situation, continue monitoring, repeat (1) and (2), and judge that extra large cable is in a safe condition;
(4), as occurred that doubtful temperature raises or strain increases, the contiguous historical data of readjustment is also obtained doubtful fault zone real time data continuously;
(5) judge doubtful fault zone characteristic of spatial distribution according to optical fiber Brillouin scattering tester real time data: be local fault or global fault;
(6) local fault in this way, whether fault zone surpasses the threshold length (being generally 10 meters) of setting, if surpass threshold value, judges that strain has occurred extra large cable; By inquiring about extra large cable strain Query Database, obtain extra large cable degree of strain, as strain continues to increase and reaches setting threshold, judge that extra large cable, in unsafe condition, sends alarm;
(7), if doubtful fault zone length is less than setting threshold, judge that the local temperature rising has occurred extra large cable; By inquiring about extra large cable temperature Query Database, obtain extra large cable temperature rising situation, as temperature continues to increase and reaches setting threshold, judge that extra large cable, in unsafe condition, sends alarm;
(8) if the temperature rising completely of extra large cable is judged by global fault, by inquiring about extra large cable temperature Query Database, obtain extra large cable temperature rising situation, as temperature continues to increase and reaches setting threshold, judge that extra large cable, in unsafe condition, sends alarm.
12, when determining, be, while by outer stress-strain, causing the Brillouin frequencies skew, will send alarm, prevention further deterioration damages composite sea cable.
13, when damaging appears in composite sea cable, the layout structure that the positional information of utilizing optical fiber Brillouin scattering tester to measure interweaves in conjunction with extra large cable, draw the physical location of trouble spot.
In this step, when damaging appears in extra large cable, utilize characteristics in step 10 to distinguish outer stress-strain damage and composite sea cable heating damage: if in temperature rising zone centered by somewhere point, be symmetric, the intermediate point frequency offset is large, little away from the skew of this frequency deviation, length surpasses meter level, determines it is that outer stress-strain damages; If temperature raises, zone is to raise completely or local the rising, significantly not symmetrical during local the rising, determines it is that the composite sea cable heating damages.
Be extra large cable heating while damaging when determining, by Monitoring Data and Temperature Modeling result, distinguish heating, local pyrexia completely:
Be all fronts adstante febres if determine, call the data judgement supply harmonic component that the harmonic wave tester obtains, judging whether transfinites, as transfinites, and fault causes because of harmonic wave; As do not transfinite, be that the power supply overvoltage causes heating;
Is local line's territory adstante febre if determine, in conjunction with the harmonic wave tester, obtains this position voltage information, the judgement thermal breakdown damages the reason caused, if voltage is normal, by cable is aging, causes thermal breakdown; If voltage is undesired, by overvoltage, cause thermal breakdown.
Based on such scheme, the present invention can carry out in real time composite sea cable, distributed security monitoring alarm, and the safe condition according to power grid quality parameter, telecommunication optical fiber excited Brillouin reflection frequency side-play amount and the calibration data of monitoring to the seabed composite cable judges; And the composite sea cable broken down is carried out to fault analysis, distinguish the main cause that causes fault.
Above demonstration and described ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.

Claims (6)

1. the alarm of composite sea cable temperature rise strain monitoring and failure analysis methods, it is characterized in that, in the cable of described method utilization sea, rich single-mode fiber carries out the real time temperature stress sensing to composite sea cable, and in conjunction with the supply harmonic test parameter, the safe condition of composite sea cable is provided to evaluation, realize the real-time monitoring to composite sea cable; The concrete steps of described method are as follows:
(1) according to composite sea cable physical arrangement size, set up the physical arrangement model;
(2) set up extra large cable models for temperature field and strain field model according to the nature parameters of each component of composite sea cable;
(3), according to physical arrangement model, models for temperature field, generate composite sea cable fiber optic temperature and cable temperature correspondence database, i.e. extra large cable temperature Query Database;
(4) set up strain-Brillouin scattering correspondence database according to strain field model and optical fiber Brillouin scattering tester characteristic, i.e. extra large cable strain Query Database;
(5) utilize the basic Brillouin scattering data of optical fiber Brillouin scattering tester under the different operating environment, set up the calibration data storehouse, be i.e. extra large cable calibration basic database;
(6) skew of Brillouin's frequency, two kinds of parameters of supply harmonic while utilizing optical fiber Brillouin scattering tester, the work of supply harmonic testing apparatus Real-Time Monitoring composite sea cable;
(7) Brillouin's frequency skew of optical fiber Brillouin scattering tester being obtained is compared with extra large cable temperature Query Database, extra large cable strain Query Database, extra large cable calibration basic database, draw cable position temperature, strain in composite sea cable, and suppose that it is the temperature elevation process that the Brillouin's frequency got is offset corresponding physical process;
(8) according to the temperature regional characteristic distributions that raises, differentiation causes that the cause of frequency shift (FS) is that outer stress-strain or composite sea cable temperature raise: if in temperature rising zone centered by somewhere point, be such as symmetrical rule, the intermediate point frequency offset is large, little away from the skew of this frequency deviation, and length surpasses meter level, determine it is that outer stress-strain causes frequency shift (FS); If temperature raises, zone is to raise completely or local rising, significantly symmetrical during local the rising, determines it is that the rising of composite sea cable temperature causes frequency shift (FS);
(9), the cable temperature data and the calibration data storehouse that obtain are compared during the frequency shift (FS) cause if the composite sea cable temperature raises, obtained composite sea cable distributed temperature situation of change, the submarine cable safety state is judged;
(10), if during the frequency shift (FS) that outer stress-strain causes, carry out alarm prevention and further worsen and damage composite sea cable;
(11) when damaging appears in extra large cable, the layout structure that the positional information of utilizing optical fiber Brillouin scattering tester to measure interweaves in conjunction with extra large cable, draw the physical location of trouble spot.
2. composite sea cable temperature rise strain monitoring alarm according to claim 1 and failure analysis methods, is characterized in that, described extra large cable models for temperature field is set up by the following method:
(1) enter program of finite element, the defined analysis filename;
(2) definition unit type: confirm the models for temperature field elementary cell;
(3) definition material Thermal Parameter: the thermal conductivity of each composition material;
(4) set up geometric model;
(5) material properties is set;
(6) grid division;
(7) apply heat and generate load;
(8) apply extra large cable surface convection heat transfer load;
(9) arrange and solve option;
(10) solve aftertreatment and obtain the hot Temperature Distribution of composite sea cable;
(11) obtain the frequency shift (FS) data that optical fiber Brillouin scattering tester obtains;
(12) determine and draw temperature value Δ f according to the skew of optical fiber backscatter frequency and temperature, strain stress relation formula:
Δ f=C 1* Δ T+C 2* ε, Δ T is the temperature rise, ε is that in composite sea cable, the light pricker elongates the number percent that strain occurs, C 1, C 2be generally the constant that single-mode optics pricker material determines, the unit of C1 is MHz/ ℃, and the unit of C2 is one of MHz/ percentage;
(13) carrying out place when experiment ε after the modeling and simulating of temperature field is zero, accordingly, and can unique definite temperature and frequency shift (FS) corresponding relation;
(14) data that contrast test data and finite element analysis obtain, adopt extra large cable surface convection heat transfer loading factor in minimum mean-squared error criterion correction step (8);
(15) repeating step (8)-(13), until analysis data and test data difference meet threshold condition, modeling finishes.
3. composite sea cable temperature rise strain monitoring alarm according to claim 1 and failure analysis methods, it is characterized in that, when the skew of the Brillouin frequency of described step (6) when the Real-Time Monitoring composite sea cable is worked, supply harmonic parameter, by single mode telecommunication optical fiber in composite sea cable to an end short circuit, an other end is connected to optical fiber Brillouin scattering tester laser output, forms closed-loop path; The supply harmonic testing apparatus is connected with the power cable of composite sea cable simultaneously.
4. composite sea cable temperature rise strain monitoring alarm according to claim 1 and failure analysis methods, is characterized in that, in described step (9), the flow process of judgement submarine cable safety state is as follows:
(1) obtain the real time data of composite sea cable monitoring from optical fiber Brillouin scattering tester;
(2) real time data of tester being obtained and extra large cable calibration basic data are delivered to temperature field modeling, strain field model database, by the mode of tabling look-up, obtain current whether occur doubtful temperature rising or strain increase;
(3) if do not occur that doubtful temperature raises or strain increases situation, continue monitoring, repeat (1) and (2), and judge that extra large cable is in a safe condition;
(4), as occurred that doubtful temperature raises or strain increases, the contiguous historical data of readjustment is also obtained doubtful fault zone real time data continuously;
(5) judge doubtful fault zone characteristic of spatial distribution according to optical fiber Brillouin scattering tester real time data: be local fault or global fault;
(6) local fault in this way, whether fault zone surpasses the threshold length of setting, if surpass threshold value, judges that strain has occurred extra large cable; By inquiring about extra large cable strain Query Database, obtain extra large cable degree of strain, as strain continues to increase and reaches setting threshold, judge that extra large cable, in unsafe condition, sends alarm;
(7), if doubtful fault zone length is less than setting threshold, judge that the local temperature rising has occurred extra large cable; By inquiring about extra large cable temperature Query Database, obtain extra large cable temperature rising situation, as temperature continues to increase and reaches setting threshold, judge that extra large cable, in unsafe condition, sends alarm;
(8) if the temperature rising completely of extra large cable is judged by global fault, by inquiring about extra large cable temperature Query Database, obtain extra large cable temperature rising situation, as temperature continues to increase and reaches setting threshold, judge that extra large cable, in unsafe condition, sends alarm.
5. composite sea cable temperature rise strain monitoring alarm according to claim 1 and failure analysis methods, it is characterized in that, when damaging appears in extra large cable, according to the characteristic distributions in step (8), distinguish outer stress-strain damage and composite sea cable heating damage in described step (11).
6. composite sea cable temperature rise strain monitoring alarm according to claim 5 and failure analysis methods, is characterized in that, when the composite sea cable heating damages, by Monitoring Data and Temperature Modeling result, distinguishes heating, local pyrexia completely; If adstante febre, call the data judgement supply harmonic component that the harmonic wave tester obtains completely, judging whether transfinites, as transfinites, and fault causes because of harmonic wave; As do not transfinite, be that the power supply overvoltage causes heating; If the heating of local line territory, obtain this position voltage information in conjunction with the harmonic wave tester, the judgement thermal breakdown damages the reason caused, if voltage is normal, by cable is aging, causes thermal breakdown; If voltage is undesired, by overvoltage, cause thermal breakdown.
CN201210041094.8A 2012-02-22 2012-02-22 Temperature rise strain monitoring and alarming and fault analysis method for composite submarine cable CN102636730B (en)

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