CN107577841A - The optical fiber composite submarine cable analysis of Temperature Characteristics method of overload operation - Google Patents
The optical fiber composite submarine cable analysis of Temperature Characteristics method of overload operation Download PDFInfo
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Abstract
The optical fiber composite submarine cable analysis of Temperature Characteristics method of overload operation, is related to optical fiber composite submarine cable analysis method.Research currently for three-core optical fiber composite submarine cable excess load lacks effective method directly perceived；The present invention comprises the following steps：The finite element modeling of extra large cable, finite element simulation：Static Simulation is analyzed；Excess load simulation analysis.The technical program establishes the threedimensional model of three-core optical fiber composite submarine cable, emulates the temperature variations of extra large cable land section and ocean block in overload using finite element method, instead of full-scale test, reaches directly perceived, inexpensive, efficient purpose.
Description
Technical field
The present invention relates to the optical fiber composite submarine cable of optical fiber composite submarine cable analysis method, especially overload operation
Analysis of Temperature Characteristics method.
Background technology
China coastline is longer, and island are numerous, and submarine cable plays in remote power feeding, high voltage power transmission and communication etc.
Very important effect.In recent years, crosslinked polyethylene（Cross-linked polyethylene, XLPE）Three core fibres are compound
Submarine cable is widely applied in the power distribution network of seabed.However, because submarine cable is involved great expense, lays and repaired more
Difficulty, the growth rate of extra large cable is far from the increase for keeping up with island power demand, therefore extra large cable excess load is transported in the power distribution network of seabed
Row happens occasionally.The three long-term overload operations of core extra large cable can accelerate the aging of cross-linking polyethylene materials, and influence extra large cable uses the longevity
Life, the insulation thermal breakdown of three core extra large cables is even resulted in, therefore the research to extra large cable overload operation is very necessary.
At present, it is more to extra large cable carrying current calculation method, there are thermal circuit model method, software calculating method, FInite Element etc..For
The research of extra large cable overload is concentrated mainly on single, and with the increase of power demand and the reduction of cable gallery, three core extra large cables exist
Using more and more extensive but directly perceived currently for the research shortage of three-core optical fiber composite submarine cable excess load in the power distribution network of seabed
Effective method.
The content of the invention
The technical problem to be solved in the present invention and the technical assignment proposed are prior art to be improved with being improved,
The optical fiber composite submarine cable analysis of Temperature Characteristics method of overload operation is provided, to reach raising purpose.Therefore, the present invention adopts
Take following technical scheme.
The optical fiber composite submarine cable analysis of Temperature Characteristics method of overload operation, extra large cable include conductor wire core, optical fiber list
Member, armouring, serving and the filler between armouring and conductor wire core, fiber unit, described conductor wire core by it is interior extremely
It is outer be followed successively by the copper conductor that blocks water, conductor shield, XLPE insulating barriers, insulation screen, semiconductive water blocking layer, lead alloy sheath,
Anticorrosive coat and PE sheaths；Optical fiber composite submarine cable analysis of Temperature Characteristics method characteristic is to comprise the following steps：
One）The finite element modeling of extra large cable：
1）Geometrical model is established, and in modeling, conductor shield, XLPE insulating barriers and insulation screen is merged to form insulation
Layer, anticorrosive coat and PE sheaths merge to form inner sheath；When establishing extra large cable model, extra large cable lay configuration is replaced with cylinder；Sea
Cable is buried among sea bed soil, and the soil horizon of sea bed is identical with extra large cable length around setting extra large cable, and extra large cable is located at soil horizon
Center, the soil layer cross section length of side are set to 2 times of the actual laying depth of extra large cable；
2）The setting of cell type and material parameter, SOLID69 units are used for temperature field and electricity in copper conductor and lead alloy sheath
The direct-coupling computing of field, description electric current produce the process of Joule heat；The hot solid elements of SOLID90 are carried out to non-copper conductor layer
Simulation analysis, the hot solid elements of SOLID90 possess multiple nodes, and each node only includes the temperature free degree；Input copper conductor, absolutely
Edge layer, semiconductive water blocking layer, lead sheath, inner sheath, packed layer, armouring bed course, armor, serving, soil, the material of light unit
Expect parameter；
3 ）FEM meshing, realize that smart grid divides to filler, other bodies are then complete using sweeping mesh generation mode
Into, and to the appropriate carry out mesh refinement of extra large cable, improve computational accuracy；
4）Boundary constraint and load apply, and the deep soil layer temperature of model lower boundary is set to constant；During extra large cable running overload
Axial temperature is basically identical, if normal direction hot-fluid is not present in model right boundary；Caused induced voltage and induced-current are 0；
Apply current load completion overload operation emulation by limiting the current-carrying bulk voltage free degree, and to a certain node in the section；
Two）Finite element simulation：
1）Static Simulation is analyzed；
A）Obtaining copper conductor highest allows operating temperature, the soil moisture, soil thermal resistivity, laying depth, rated current-carrying capacity；Volume
Current-carrying capacity is determined for the specified of the ocean block of rated current-carrying capacity of the extra large cable in land section or the rated current-carrying capacity amendment according to land section
Current-carrying capacity；
B corresponding rated current-carrying capacity) is applied to land section extra large cable model and ocean block extra large cable model, sea is calculated by stable state
Cable copper conductor final temperature；
C) judge that extra large cable copper conductor final temperature and copper conductor highest allow the difference of operating temperature whether in setting range；If
Within the acceptable range, then prove that institute's established model is correct；
2）Excess load simulation analysis；
A) land section extra large cable overload operation emulates；
A) the cyclic load curve maximum of typical day is obtained；
B) according to cyclic load curve maximum, land section extra large cable model and ocean block extra large cable model are applied corresponding to load,
After 24 hours, excess load emulation is carried out；
C) time when extra large cable copper conductor temperature under different event of overload reaches highest permission operating temperature is recorded；
B) ocean block extra large cable overload operation emulates；
A) load of land section extra large cable is similarly applied to the extra large cable model of ocean block；According to cyclic load curve, to ocean block
Load corresponding to the application of extra large cable model, after 24 hours, carry out excess load emulation；
B) time when extra large cable copper conductor temperature under different event of overload reaches highest permission operating temperature is recorded；
C) analysis of simulation result；
Analyze land section, the extra large cable overload operation simulation result of ocean block；Compare land section under same event of overload,
The extra large cable crash time of ocean block is poor, and the situation that crash time difference changes with excess load, and the crash time is in copper conductor temperature
Rise to the time needed for highest permission operating temperature.
The technical program establishes the threedimensional model of three-core optical fiber composite submarine cable, and extra large cable land is emulated using finite element method
The temperature variations of section and ocean block in overload, instead of full-scale test, reach inexpensive, efficient purpose.
As further improving and supplementing to above-mentioned technical proposal, present invention additionally comprises following additional technical feature.
Extra large cable includes three conductor wire cores, a light unit, three conductor wire core product word row arrangements.
In steady-state analysis, copper conductor highest is taken to allow operating temperature to be 90 DEG C, the soil moisture is 25 DEG C, soil thermal resistance system
Number is 1.2Km/W, laying depth 1.5m, current-carrying capacity when air themperature is 40 DEG C.
When carrying out excess load emulation, to extra large cable apply load for normal load 120%, 140%, 160%, 180%,
200%.A variety of loads are emulated, to improve accuracy.
Beneficial effect：The technical program establishes the threedimensional model of three-core optical fiber composite submarine cable, utilizes finite element side
Method emulates temperature variations in overload of extra large cable land section and ocean block, instead of full-scale test, reach it is directly perceived, low into
Originally, efficient purpose.
Brief description of the drawings
Fig. 1 is three-core optical fiber composite submarine cable section of structure of the present invention.
Fig. 2（a）It is the integral grid division design sketch of the present invention.
Fig. 2（b）It is extra large cable mesh generation design sketch of the present invention.
Fig. 3 (a) is land section extra large cable Temperature Distribution cloud atlas.
Fig. 3 (b) is ocean block extra large cable Temperature Distribution cloud atlas.
Fig. 4 is county of Fujian Province July day cyclic load curve.
Fig. 5 is land section extra large cable copper conductor temperature variation.
Fig. 6 is ocean block extra large cable copper conductor temperature variation.
Fig. 7 is flow chart of the present invention.
Embodiment
Technical scheme is described in further detail below in conjunction with Figure of description.
As shown in fig. 7, the present invention is in comprising the following steps：
One）The finite element modeling of extra large cable：
1）Geometrical model is established, and in modeling, conductor shield, XLPE insulating barriers and insulation screen is merged to form insulation
Layer, anticorrosive coat and PE sheaths merge to form inner sheath；When establishing extra large cable model, extra large cable lay configuration is replaced with cylinder；Sea
Cable is buried among sea bed soil, and the soil horizon of sea bed is identical with extra large cable length around setting extra large cable, and extra large cable is located at soil horizon
Center, the soil layer cross section length of side are set to 2 times of the actual laying depth of extra large cable；
2）The setting of cell type and material parameter, SOLID69 units are used for temperature field and electricity in copper conductor and lead alloy sheath
The direct-coupling computing of field, description electric current produce the process of Joule heat；The hot solid elements of SOLID90 are carried out to non-copper conductor layer
Simulation analysis, the hot solid elements of SOLID90 possess multiple nodes, and each node only includes the temperature free degree；Input copper conductor, absolutely
Edge layer, semiconductive water blocking layer, lead sheath, inner sheath, packed layer, armouring bed course, armor, serving, soil, the material of light unit
Expect parameter；
3 ）FEM meshing, realize that smart grid divides to filler, other bodies are then complete using sweeping mesh generation mode
Into, and to the appropriate carry out mesh refinement of extra large cable, improve computational accuracy；
4）Boundary constraint and load apply, and the deep soil layer temperature of model lower boundary is set to constant；During extra large cable running overload
Axial temperature is basically identical, if normal direction hot-fluid is not present in model right boundary；Caused induced voltage and induced-current are 0；
The current-carrying bulk voltage free degree is limited, and current load is applied to a certain node in the section；
Two）Finite element simulation：
1）Static Simulation is analyzed；
A）Obtaining copper conductor highest allows operating temperature, the soil moisture, soil thermal resistivity, laying depth, rated current-carrying capacity；Volume
Current-carrying capacity is determined for the specified of the ocean block of rated current-carrying capacity of the extra large cable in land section or the rated current-carrying capacity amendment according to land section
Current-carrying capacity；
B corresponding rated current-carrying capacity) is applied to land section extra large cable model and ocean block extra large cable model, sea is calculated by stable state
Cable copper conductor final temperature；
C) judge that extra large cable copper conductor final temperature and copper conductor highest allow the difference of operating temperature whether in setting range；If
Within the acceptable range, then prove that institute's established model is correct；
2）Excess load simulation analysis；
A) land section extra large cable overload operation emulates；
A) the cyclic load curve maximum of typical day is obtained；
B) according to cyclic load curve maximum, land section extra large cable model and ocean block extra large cable model are applied corresponding to load,
After 24 hours, excess load emulation is carried out；
C) time when extra large cable copper conductor temperature under different event of overload reaches highest permission operating temperature is recorded；
B) ocean block extra large cable overload operation emulates；
A) load of land section extra large cable is similarly applied to the extra large cable model of ocean block；According to cyclic load curve, to ocean block
Load corresponding to the application of extra large cable model；After 24 hours, excess load emulation is carried out；
B) record extra large cable copper conductor temperature under different event of overload and reach the time that highest allows operating temperature；
C) analysis of simulation result；
Analyze land section, the extra large cable overload operation simulation result of ocean block；Compare land section under same event of overload,
The extra large cable crash time of ocean block is poor, and the situation that crash time difference changes with excess load, and the crash time is in copper conductor temperature
Rise to the time needed for highest permission operating temperature.
The technical program establishes the threedimensional model of three-core optical fiber composite submarine cable, and extra large cable land is emulated using finite element method
The temperature variations of section and ocean block in overload, instead of full-scale test, reach inexpensive, efficient purpose.
With regard to embodiment, the present invention is described further below.
The HYJQF41-F 64/110kV 3*400 copper core XLPE insulating optical fibers composite submarine cable sea that the present embodiment uses
Bottom cable is twisted by three identical conductor wire cores, a light unit and cladding material, in kind and profile such as Fig. 1
It is shown.
As shown in Figure 1, the conductor wire core of three core extra large cables arranges in extra large cable in triangle disposition, is followed successively by blocks water from inside to outside
Copper conductor 1, copper conductor shielding 2, XLPE insulation 3, insulation shielding 4, semiconductive water blocking layer 5, alloy sleeve 6, anticorrosive coat 7 and PE shields
Set 8.Cladding material is followed successively by filler 9, band 10, PP inner cushion layers 11, wire armoring 12 and PP servings 13 from inside to outside.
Fiber unit 14 in filler is made up of polyethylene inner sheath and steel pipe, and communication is placed in steel pipe with single-mode fiber in relaxed state
Among.Copper conductor is successively twisted by conduction circle single line；Core and light unit are wrapped in a manner of twisted respectively fills out
Fill in thing；Steel wire armor layer is then wrapped in extra large cable designated layer by armouring wire in a manner of layer twists.
Three-core optical fiber composite submarine cable structure is complex, and the present embodiment is in actual modeling process according to IEC（It is international
The electrician committee）Standard has carried out appropriate simplification to model.Copper conductor shielding, XLPE insulation and insulation shielding are all polyethylene
Material, Electrothermal Properties are similar, and copper conductor shielding and insulation shielding it is relatively thin, by this three it is laminated simultaneously, be referred to as insulating barrier.Three core extra large cables
Belting layer is relatively thin, and itself and filler are merged into one layer.Each layer size of extra large cable after simplification is as shown in table 1.
The submarine cable structure of table 1 simplifies table
Axial temperature difference very little under three-core optical fiber composite submarine cable running overload state, and the lay configuration of extra large cable be in order to
Strengthen the mechanical strength of extra large cable, it is smaller on influences such as internal heat transfer and Temperature Distributions, therefore when establishing extra large cable model, by sea
Cable axial length is set as 0.1m, and the extra large cable lay configuration of reality is replaced with cylinder.Extra large cable is buried among sea bed soil, if
The soil horizon of sea bed is identical with extra large cable length around the cable of Dinghai, and extra large cable is located at the center of soil horizon, and the soil layer cross section length of side is by sea
The actual laying depth of cable determines.
The setting of 1.1 cell types and material parameter
Many of ANSYS softwares can carry out the cell type of electro thermal coupling analysis, and wherein SOLID69 units include voltage simultaneously
It is electric available for the direct-coupling computing of temperature field in copper conductor and lead alloy sheath and electric field, description with two frees degree of temperature
The process that miscarriage green coke is had burning ears.Heat transfer only occurs for the non-copper conductor layer of extra large cable, without electric current, therefore it is real using SOLID90 heat
Body unit carries out simulation analysis, and the unit possesses 20 nodes, and each node only includes the temperature free degree, unwise to electrical parameter
Sense.
Temperature rise does not change over time during extra large cable steady-state operation, and extra large cable temperature when transient state is run is then the function of time.For
The running overload characteristic of abundant research extra large cable, it is necessary to consider that extra large cable transient state is run, being emulated to the running overload of extra large cable needs
The material parameter to be used（At 20 DEG C）As shown in table 2.
The extra large cable FEM model material parameter table of table 2
2.3 FEM meshing
Finite element stimulation is carried out in units of grid cell, and classifying rationally grid is the premise effectively calculated.ANSYS
Software provides following several different mesh generation modes：Smart grid division, scan mesh generation, map grids division and
Mixing division.Because extra large cable structure is complex, poor mesh quality can be obtained using single mesh generation mode, influenceed
The convergence and accuracy of calculating.The present embodiment is real to filler by controlling the size of line and axis on extra large cable section
Existing smart grid division, other bodies are then completed using sweeping mesh generation mode, and to the appropriate carry out mesh refinement of extra large cable, are improved
Computational accuracy.Ready-portioned grid effect is as shown in Figure 2.
2.4 boundary constraints and load apply
The edge-restraint condition of reasonable definition extra large cable is the premise of three core extra large cable excess loads of correct emulation.Terrestrial soil layer and air
Natural convection air be present, seawater heat convection between sea bed soil horizon and seawater be present；The deep soil layer of model lower boundary
Temperature is set to constant；Axial temperature is basically identical during extra large cable running overload, if normal direction hot-fluid is not present in model right boundary[5]。
The Sheathed metal sheath two-terminal-grounding of three-core optical fiber composite submarine cable, the electric current phase of three cores is flowed through during normal operation
Mutually balance, the magnetic flux of sensing is cancelled out each other, therefore caused induced voltage and induced-current are 0.The present embodiment passes through limitation
The current-carrying bulk voltage free degree, and current load completion overload operation emulation is applied to a certain node in the section.
3. finite element simulation
3.1 steady-state analysis
The reference data given according to Technical Manual-Engineering, screen layer are the HYJQF41-F 64/110kV 3*400 copper of lead set
The copper conductor highest of core XLPE insulating optical fiber composite submarine cables allows operating temperature to be 90 DEG C, and the soil moisture is 25 DEG C, soil
Thermal resistivity is 1.2Km/W, and laying depth 1.5m, air themperature is 40 DEG C（Not by periods of direct sunlight）When current-carrying capacity be 530A.
Land temperature is higher, soil radiating is slower, and the given current-carrying capacity of Technical Manual-Engineering is rated current-carrying capacity of the extra large cable in land section.
Extra large cable is mostly in seabed, and bottom-water temperature is relatively low, and seawater radiating is very fast, and the current-carrying capacity of ocean block should be higher than that land
Section, therefore the rated current-carrying capacity of ocean block should suitably be revised, correction factor is as shown in the table：
Table 3（a）The asynchronous current-carrying quantity correction coefficient of environment temperature
Table 3（b）The current-carrying quantity correction coefficient of different soils thermal resistivity
Table 3（c）The current-carrying quantity correction coefficient of different laying depths
It it is 25 DEG C if sea bed deep soil temperature is identical with ocean temperature, the thermal resistivity of ocean bottom soil is 0.8Km/W, sea
The extra large cable laying depth of bottom section is 2m, is about 678A by revised current-carrying capacity.
Establish the 3-D geometric model of three core extra large cable land sections and ocean block respectively in ANSYS, corresponding current-carrying capacity is applied
It is added on the model of foundation, the extra large cable Temperature Distribution cloud atlas being calculated by stable state is as shown in Figure 3.
Emulation is understood, applies the extra large cable obtained after rated current-carrying capacity to three core land extra large cable segment models and seabed extra large cable model
Copper conductor final temperature is respectively 91.66 DEG C, 91.04 DEG C, with copper conductor highest allow operating temperature differ only by 1.66 DEG C, 1.04
℃.In modeling process, in order to improve computational efficiency, the present embodiment is simplified to extra large cable model, therefore in simulation process
Inevitably error be present, but within the acceptable range, stable state solving result is confirming the present embodiment institute established model just
True property.By Fig. 3（a）Understand, because top air themperature is up to 40 DEG C, the extra large cable upper strata entirety soil moisture be higher than extra large cable with
Under soil horizon temperature.Fig. 3（b）In extra large cable due to buried ocean bottom soil layer, seawater thermal conductivity is good, and ocean bottom soil temperature is set to
It is identical with ocean temperature, therefore temperature is more uniform up and down for model.
3.2 excess load simulation analysis
3.2.1 land section extra large cable overload operation emulates
Three core extra large cables are not constantly to be run with rated current-carrying capacity in island power supply process, and its current-carrying capacity, which is presented, periodically to be become
Change, transmission load is using 24h as a period of change.Because thermal time constant acts on, even if extra large cable reaches specified load in a short time
Flow, temperature will not also be raised to 90 DEG C at once.In actual moving process, daily load factor and load cycling current-carrying capacity factor
Difference, the periodicity current-carrying capacity waveform of extra large cable slightly has difference.Take county of Fujian Province 110kV extra large cable date periodicities in July day
Load curve, as shown in Figure 4.
As seen from the figure, the peak times of power consumption of this county appear at early 8 points between 22 points of evening, wherein the morning 11：30 or so go out
Existing intraday electricity consumption peak value.After allowing the present embodiment extra large cable to be run 24 hours under the load, then carry out extra large cable overload operation
Emulation, as a result as shown in Figure 4.
As shown in Figure 5, extra large cable copper conductor temperature stabilization during day-to-day operation at 35 DEG C or so, applied negative to extra large cable
After lotus, extra large cable temperature can rise rapidly, and with the aggravation of event of overload, the temperature rise rate of extra large cable copper conductor is also constantly increasing
Greatly.Three core extra large cables are run in the case of excess load 20%, after 376 hours, extra large cable copper conductor temperature can up to 90 DEG C, equally,
After applying 140%, 160%, 180%, 200% load to extra large cable, time that copper conductor reaches needed for 90 DEG C be respectively 44.96h,
8.3h、2.85h、1.43h.The insulating barrier highest of known three cores extra large cable allows operating temperature to be 90 DEG C, thus extra large cable copper conductor from
Normal operating temperature reaches the crash time of the time namely maximum needed for 90 DEG C.The time that extra large cable is run in excess load 100%
No more than 1.43 hours, if failing to prevent the overload operation of extra large cable in time within the time, extra large cable insulating barrier can be accelerated
Aging, the extra large cable life-span is reduced, extra large cable failure of insulation can be caused when serious, trigger failure.
3.2.2 ocean block extra large cable overload operation emulates
The load of land section extra large cable is put on to the extra large cable model of ocean block, obtained simulation curve is as shown in Figure 6.Can by Fig. 6
Know, same load is applied to seabed segment model, and the time that copper conductor reaches 90 DEG C reaches 90 DEG C than land model copper conductor
Time will be grown, and to the load of extra large cable application 120%, 140%, 160%, 180%, 200%, the time that copper conductor reaches 90 DEG C is respectively
395h、68.98h、8.5h、2.87h、1.45h。
3.3 analysis of simulation result
Emulated more than, extra large cable is in the case where excess load is relatively low, the ocean block crash time（That is extra large cable copper conductor temperature
The time required to reaching 90 DEG C）It is greater than the crash time of land section extra large cable, with the aggravation of event of overload, ocean block and land
The crash time of section is shorter and shorter, and both move closer to.It is better than land section extra large cable this is because while ocean block radiates, but
With the increase of overload value, heat caused by electric current increase is much larger than heat dissipation capacity, therefore both temperature variations are similar, should
The anxious time is approximately the same.
If extra large cable overload value is relatively low, reduces load in time within the crash time, then extra large cable will not be damaged；If
Duration of load application is reduced between land section and ocean block crash time, even if then land section has damage, now ocean block is still
Can normal use.As overload value is increasing, if reducing load not in time, whole piece extra large cable will be caused serious injury.
The optical fiber composite submarine cable analysis of Temperature Characteristics method of overload operation shown in figure 7 above is the tool of the present invention
Body embodiment, substantive distinguishing features of the present invention and progress are embodied, can be according to the use needs of reality, in the enlightenment of the present invention
Under, carry out the equivalent modifications of shape, structure etc. to it, this programme protection domain row.
Claims (4)
1. the optical fiber composite submarine cable analysis of Temperature Characteristics method of overload operation, extra large cable include conductor wire core, fiber unit,
Armouring, serving and the filler between armouring and conductor wire core, fiber unit, described conductor wire core from the inside to the outside according to
Secondary is block water copper conductor, conductor shield, XLPE insulating barriers, insulation screen, semiconductive water blocking layer, lead alloy sheath, anti-corrosion
Layer and PE sheaths；Optical fiber composite submarine cable analysis of Temperature Characteristics method characteristic is to comprise the following steps：
One）The finite element modeling of extra large cable：
1）Geometrical model is established, and in modeling, conductor shield, XLPE insulating barriers and insulation screen is merged to form insulation
Layer, anticorrosive coat and PE sheaths merge to form inner sheath；When establishing extra large cable model, extra large cable lay configuration is replaced with cylinder；Sea
Cable is buried among sea bed soil, and the soil horizon of sea bed is identical with extra large cable length around setting extra large cable, and extra large cable is located at soil horizon
Center, the soil layer cross section length of side are set to 2 times of the actual laying depth of extra large cable；
2）The setting of cell type and material parameter, SOLID69 units are used for temperature field and electricity in copper conductor and lead alloy sheath
The direct-coupling computing of field, description electric current produce the process of Joule heat；The hot solid elements of SOLID90 are carried out to non-copper conductor layer
Simulation analysis, the hot solid elements of SOLID90 possess multiple nodes, and each node only includes the temperature free degree；Input copper conductor, absolutely
Edge layer, semiconductive water blocking layer, lead sheath, inner sheath, packed layer, armouring bed course, armor, serving, soil, the material of light unit
Expect parameter；
3 ）FEM meshing, realize that smart grid divides to filler, other bodies are then complete using sweeping mesh generation mode
Into, and to the appropriate carry out mesh refinement of extra large cable, improve computational accuracy；
4）Boundary constraint and load apply, and the deep soil layer temperature of model lower boundary is set to constant；During extra large cable running overload
Axial temperature is basically identical, if normal direction hot-fluid is not present in model right boundary；Caused induced voltage and induced-current are 0；
The current-carrying bulk voltage free degree is limited, and current load is applied to a certain node in the section；
Two）Finite element simulation：
1）Static Simulation is analyzed；
A）Obtaining copper conductor highest allows operating temperature, the soil moisture, soil thermal resistivity, laying depth, rated current-carrying capacity；Volume
Current-carrying capacity is determined for the specified of the ocean block of rated current-carrying capacity of the extra large cable in land section or the rated current-carrying capacity amendment according to land section
Current-carrying capacity；
B corresponding rated current-carrying capacity) is applied to land section extra large cable model and ocean block extra large cable model, sea is calculated by stable state
Cable copper conductor final temperature；
C) judge that extra large cable copper conductor final temperature and copper conductor highest allow the difference of operating temperature whether in setting range；If
Within the acceptable range, then prove that institute's established model is correct；
2）Excess load simulation analysis；
A) land section extra large cable overload operation emulates；
A) the cyclic load curve maximum of typical day is obtained；
B) according to cyclic load curve maximum, land section extra large cable model and ocean block extra large cable model are applied corresponding to load,
After 24 hours, excess load emulation is carried out；
C) time when extra large cable copper conductor temperature under different event of overload reaches highest permission operating temperature is recorded；
B) ocean block extra large cable overload operation emulates；
A) load of land section extra large cable is similarly applied to the extra large cable model of ocean block；According to cyclic load curve, to ocean block
Load corresponding to the application of extra large cable model；After 24 hours, excess load emulation is carried out；
B) record extra large cable copper conductor temperature under different event of overload and reach the time that highest allows operating temperature；
C) analysis of simulation result；
Analyze land section, the extra large cable overload operation simulation result of ocean block；Compare land section under same event of overload,
The extra large cable crash time of ocean block is poor, and the situation that crash time difference changes with excess load, and the crash time is in copper conductor temperature
Rise to the time needed for highest permission operating temperature.
2. the optical fiber composite submarine cable analysis of Temperature Characteristics method of overload operation according to claim 1, its feature
It is：Extra large cable includes three conductor wire cores, a light unit, three conductor wire core product word row arrangements.
3. the optical fiber composite submarine cable analysis of Temperature Characteristics method of overload operation according to claim 1, its feature
It is：In steady-state analysis, copper conductor highest is taken to allow operating temperature to be 90 DEG C, the soil moisture is 25 DEG C, soil thermal resistivity
For 1.2Km/W, laying depth 1.5m, current-carrying capacity when air themperature is 40 DEG C.
4. the optical fiber composite submarine cable analysis of Temperature Characteristics method of overload operation according to claim 1, its feature
It is：It is 120%, 140%, 160%, 180%, the 200% of normal load to the load that extra large cable applies when carrying out excess load emulation.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111028332A (en) * | 2019-11-21 | 2020-04-17 | 浙江华云电力工程设计咨询有限公司 | Construction method and display method for power grid model |
| CN113032939A (en) * | 2021-04-15 | 2021-06-25 | 西南石油大学 | Submarine cable burial depth prediction method based on hot-circuit model analysis |
| CN113836654A (en) * | 2021-09-09 | 2021-12-24 | 国网上海市电力公司 | Modeling method for measuring and calculating influence of thermal mechanical property of superconducting cable |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2742937A1 (en) * | 2008-11-08 | 2010-05-14 | Sensortran, Inc. | System and method for determining characteristics of power cables using distributed temperature sensing systems |
-
2017
- 2017-07-28 CN CN201710632484.5A patent/CN107577841A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2742937A1 (en) * | 2008-11-08 | 2010-05-14 | Sensortran, Inc. | System and method for determining characteristics of power cables using distributed temperature sensing systems |
Non-Patent Citations (2)
| Title |
|---|
| 刘刚等: "10kV三芯电缆应急时间计算模型与验证", 《华南理工大学学报（自然科学版）》 * |
| 张旭: "海底高压光电复合缆故障仿真研究", 《中国优秀硕士学位论文全文数据库 基础科学辑（月刊）》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111028332A (en) * | 2019-11-21 | 2020-04-17 | 浙江华云电力工程设计咨询有限公司 | Construction method and display method for power grid model |
| CN111028332B (en) * | 2019-11-21 | 2023-09-22 | 浙江华云电力工程设计咨询有限公司 | Construction method and display method for power grid model |
| CN113032939A (en) * | 2021-04-15 | 2021-06-25 | 西南石油大学 | Submarine cable burial depth prediction method based on hot-circuit model analysis |
| CN113836654A (en) * | 2021-09-09 | 2021-12-24 | 国网上海市电力公司 | Modeling method for measuring and calculating influence of thermal mechanical property of superconducting cable |
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