CN103336187A - Composite sea cable current-carrying capacity calculating method - Google Patents

Composite sea cable current-carrying capacity calculating method Download PDF

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CN103336187A
CN103336187A CN2013102085851A CN201310208585A CN103336187A CN 103336187 A CN103336187 A CN 103336187A CN 2013102085851 A CN2013102085851 A CN 2013102085851A CN 201310208585 A CN201310208585 A CN 201310208585A CN 103336187 A CN103336187 A CN 103336187A
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sea cable
composite sea
temperature
current
carrying capacity
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CN103336187B (en
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李毅
魏澈
刘晓亮
何玉仓
高红武
刘进辉
王新华
刘频频
安博文
周灵
陈元林
周蓉蓉
王晓峰
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China National Offshore Oil Corp CNOOC
Shanghai Maritime University
CNOOC Energy Technology and Services Ltd
CNOOC China Ltd Tianjin Branch
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China National Offshore Oil Corp CNOOC
Shanghai Maritime University
CNOOC Energy Technology and Services Ltd
CNOOC China Ltd Tianjin Branch
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Abstract

The invention discloses a composite sea cable current-carrying capacity calculating method. The method comprises establishing a geometrical model; outputting physical property parameters of composition materials; performing grid division and establishing a finite element model of a photoelectric composite sea cable; setting value ranges of environment temperatures and heat convection coefficients, an initial environment temperature, an initial heat convection coefficient, a photoelectric composite sea cable working current; calculating temperature field distribution of the photoelectric composite sea cable and acquiring the conductor temperature and the optical fiber temperature in the photoelectric composite sea cable; determining whether |TC-t| is larger than epsilon or not, determining whether TC-t is larger than 0 or not; storing the environment temperatures, the heat convection coefficients, the current-carrying capacity and the optical fiber temperature to a current-carrying capacity database; adjusting the parameters so as to enable the heat coefficient h to be equal to h2; adjusting the parameters so as to enable the environment temperature T to be equal to T2; and calculating the current-carrying capacity of the photoelectric composite sea cable at the optical fiber temperature. The method can flexibly and dynamically adjust the current-carrying capacity of the photoelectric composite sea cable according to season changes and environmental condition changes so that the capability of transmitting electric energy of the photoelectric composite sea cable can be exerted to the utmost.

Description

Composite sea cable current-carrying capacity computing method
Technical field
The present invention relates to a kind of photoelectric composite sea cable temperature real time monitoring, be specifically related to a kind of method of calculating the photoelectric composite sea cable dynamic current-carrying capacity.
Background technology
Photoelectric composite sea cable is to be responsible for providing the electric power between each platform in the offshore oil exploitation to supply with liaison, is the lifeline of each platform, and its safe condition is most important for the operate as normal that ensures each production platform.Therefore, how to ensure under the prerequisite that its long-term safety is moved reliably, rationally determining the current-carrying capacity of photoelectric composite sea cable, significance is being arranged.
At present, the calculating of current-carrying capacity of cable generally is to calculate according to the IEC60287 standard, but the current-carrying capacity that this standard only satisfies under the simple environmental baseline calculates, when cable is actual when laying environment and being different from the reference parameter value of its setting, need determine corresponding correction coefficient by a large amount of tests, have certain limitation.And do not mention the computing method of photoelectric composite sea cable current-carrying capacity among the IEC60287.
Summary of the invention
The invention provides a kind of composite sea cable current-carrying capacity computing method, can flexibly, dynamically regulate the current-carrying capacity of photoelectric composite sea cable according to seasonal variations, changes in environmental conditions, bring into play the ability of its electric energy transmitting to greatest extent.
For achieving the above object, the invention provides a kind of composite sea cable current-carrying capacity computing method, be characterized in that the method includes the steps of:
Step 1, according to the structural parameters of photoelectric composite sea cable with lay environment, set up the composite sea cable geometric model;
The physical function parameter of each composition material of step 2, input photoelectric composite sea cable;
Step 3, composite sea cable is carried out grid divide, set up the finite element model of photoelectric composite sea cable;
Step 4, according to the environmental baseline of laying of photoelectric composite sea cable, get the environment temperature span for [T 1, T 2], the temperature interval is Δ T; The scope of convection transfer rate is [h 1, h 2], interval delta h;
Step 5, setting original ambient temperature T are T 1, initial convection transfer rate h is h 1
The initial value I of step 6, setting photoelectric composite sea cable working current I 0
Working current I, environment temperature T, the convection transfer rate h of step 7, input photoelectric composite sea cable, the temperature field of calculating photoelectric composite sea cable according to the three-dimensional unstable state heat conduction differential equation in the cartesian coordinate system distributes, and obtains the temperature T of conductor in the photoelectric composite sea cable CWith fiber optic temperature T O
Step 8, judgement | T CWhether-90| greater than ε, if, | T C-t|〉ε, then jump to step 9; If not, | T C-t|≤ε then jumps to step 10; T is the maximum temperature value that the composite sea cable insulating material is allowed continuous firing for a long time, and ε is the allowed error of actual engineering;
Step 9, judgement T CWhether-t greater than 0, if, T C-t〉0, then reduce I 0Value, and jump to step 6; If not, T C-t＜0 then increases I 0Value, and jump to step 6;
Step 10, the current value current-carrying capacity I under the environmental baseline for this reason that gets photoelectric composite sea cable working current I this moment z, and with environment temperature T, convection transfer rate h, current-carrying capacity I at this moment z, fiber optic temperature T OStore in the current-carrying capacity database;
Step 11, judge whether convection transfer rate h equals h 2If,, then jump to step 12, if not, then make the convection transfer rate h under environmental baseline this moment increase Δ h, and jump to step 6;
Step 12, judge whether environment temperature T equals T 2If,, then jump to step 13, if not, then make the environment temperature T under environmental baseline this moment increase Δ T, and jump to step 6;
Redundant single-mode fiber in step 13, the employing photoelectric composite sea cable, and adopt the Brillouin optical time domain analysis technology to monitor out the temperature of optical fiber in the photoelectric composite sea cable in real time, by inquiry current-carrying capacity database, obtain the current-carrying capacity I of photoelectric composite sea cable under this fiber optic temperature z
Lay environment in the above-mentioned steps 1 and comprise environment temperature, composite sea cable surrounding medium, the thermal resistivity of soil media, the convection heat transfer situation on fluid and composite sea cable surface; Environment temperature comprises the temperature of temperature, seawater and the air of buried depth place soil; The composite sea cable surrounding medium comprises soil, seawater, air.
The physical function parameter of physical function parameter comprises in the above-mentioned steps 2: density, specific heat capacity, heat-conduction coefficient.
The computing formula that the temperature field of calculating photoelectric composite sea cable distributes in the above-mentioned steps 7 is as follows:
Figure 376320DEST_PATH_IMAGE002
（1）
In the formula, p is the density of material, units/m3; C is the specific heat of material, the J/ of unit (kg ℃); T is the transient temperature of object, unit ℃; τ is the time that process is carried out, the s of unit; λ is the coefficient of heat conductivity of material, the W/ of unit (m ℃); Qv is the endogenous pyrogen of material, the W/m3 of unit.
Composite sea cable current-carrying capacity computing method of the present invention are compared with prior art, its advantage is, the present invention can flexibly, dynamically regulate the current-carrying capacity of photoelectric composite sea cable according to seasonal variations, changes in environmental conditions, brings into play the ability of its electric energy transmitting to greatest extent.
Description of drawings
Fig. 1 is the method flow diagram of composite sea cable current-carrying capacity computing method of the present invention;
Fig. 2 is the structural representation of composite sea cable;
Fig. 3 is the structural representation of optical cable in the composite sea cable.
Embodiment
Below in conjunction with accompanying drawing, further specify specific embodiments of the invention.
As shown in Figure 1, the present invention discloses a kind of composite sea cable current-carrying capacity computing method, and the method includes the steps of:
Step 1, according to the structural parameters of photoelectric composite sea cable with lay environment, set up its geometric model.
As shown in Figure 2, be the one-piece construction synoptic diagram of composite sea cable, composite sea cable comprises parallel three subsea cables that arrange, is arranged on the optical cable 14 of subsea cable one side, and is coated on the protective seam outside subsea cable and the optical cable 14.
Protective seam is followed successively by wrapped bed course 9, interior dipping serving 12, wire armoring layer 10, anti-corrosion asphalt 11 from inside to outside, floods serving 13 outward.
Subsea cable comprises conductor 1, conductor shielding 2, insulation 3, insulation shielding 4, water blocking layer 5, plumbous cover 6, pe sheath 7 from inside to outside.
Between subsea cable and optical cable 14 and protective seam, be full of filling material 8 is arranged.
As shown in Figure 3, be the structural representation of optical cable part, optical cable 14 includes fibre bundle that some optical fiber 144 form from inside to outside successively, be wrapped in the outer fine cream 143 of optical fiber 144, be set in the outer stainless-steel tube 142 of fine cream 143 and be set in the outer PE sheath 141 of stainless-steel tube 142.
Structural parameters are the diameter of each ingredient of composite sea cable.
Laying environment comprises: environment temperature (temperature of temperature, seawater and the air of buried depth place soil), composite sea cable surrounding medium (soil, seawater, air etc.), the thermal resistivity of soil media, the convection heat transfer situation on fluid and composite sea cable surface.
The physical function parameter of each composition material of step 2, input photoelectric composite sea cable, this physical function parameter comprises density, specific heat capacity, heat-conduction coefficient.
Step 3, the geometric model of the composite sea cable set up in the step 1 is carried out grid divide, set up the finite element model of photoelectric composite sea cable.
Step 4, according to the environmental baseline of laying of photoelectric composite sea cable, get the environment temperature span for [T 1, T 2], the temperature interval is Δ T.In the present embodiment, T 1Get-31 degrees centigrade (℃), T2 get 50 degrees centigrade (℃), Δ T get 1 degree centigrade (℃).
The scope of convection transfer rate is [h 1, h 2], interval delta h.In the present embodiment, h 1Get 1, h 2Get 1000, unit is (W/ (m ℃)), and the difference of calculating the gained conductor temperature when interval delta h gets different value with convection transfer rate is standard less than 1 ℃.
Step 5, setting original ambient temperature T are T 1, initial convection transfer rate h is h 1In the present embodiment, T 1Get-31 ℃, h 1Get 1 W/ (m ℃).
The initial value I of step 6, setting photoelectric composite sea cable working current I 0In the present embodiment, initial value I 0Get 300 amperes (A).
Working current I, environment temperature T, the convection transfer rate h of step 7, input photoelectric composite sea cable, the temperature field of calculating photoelectric composite sea cable according to the three-dimensional unstable state heat conduction differential equation in the cartesian coordinate system distributes, and obtains the temperature T of conductor in the photoelectric composite sea cable CWith fiber optic temperature T O
The computing formula that the temperature field of calculating photoelectric composite sea cable distributes is as follows:
Figure 2013102085851100002DEST_PATH_IMAGE003
（1）
In the formula, p is the density of material, units/m3; C is the specific heat of material, the J/ of unit (kg ℃); T is the transient temperature of object, unit ℃; τ is the time that process is carried out, the s of unit; λ is the coefficient of heat conductivity of material, the W/ of unit (m ℃); Qv is the endogenous pyrogen of material, the W/m3 of unit.
The current-carrying capacity of step 8, power cable should satisfy, and under this function of current, the working temperature of power cable is no more than the temperature value that the heat-resisting life-span of power cable insulation allows, and meets the requirement of conductor connection reliability.What the composite sea cable insulating material in the implementation case adopted is crosslinked polyethylene, and allowing the maximum temperature of continuous firing for a long time because of crosslinked polyethylene is 90 ℃, so Rule of judgment herein is 90 ℃.If other insulating material, then 90 ℃ should be revised as the maximum temperature value t that this material is allowed continuous firing for a long time.
So, judge | the magnitude relationship of TC-90| and ε, if | T C-90|〉ε, then jump to step 9; If | T C-90|≤ε then jumps to step 10.Wherein, ε determines that according to the allowed error of actual engineering the allowed error of even actual engineering is 0.1 ℃, and ε herein namely gets 0.1 ℃.
Step 9, judge TC-90 and 0 magnitude relationship, as if T C-90〉0, then reduce the value of I0, and jump to step 6, repeating step 6 is to step 8; If T C-90＜0, then increase I 0Value, and jump to step 6, repeating step 6 is to step 8.Because step 9 is at step 8|T C-90|〉on the basis of ε, so 0 situation can not occur equaling.
Step 10, the current value current-carrying capacity I under the environmental baseline for this reason that gets photoelectric composite sea cable working current I this moment zAnd with environment temperature T, convection transfer rate h, current-carrying capacity I at this moment z, fiber optic temperature T OStore in the current-carrying capacity database, jump to step 11.
Step 11, judge whether convection transfer rate h equals h 2, h 2Be 1000W/ (m ℃), if convection transfer rate h is not equal to h 2, being about to convection transfer rate h increases Δ h successively, and repeating step 6 equals h to step 10 until h 2, jump to step 12.Be that flow process is as follows: judge whether convection transfer rate h equals h 2If,, then jump to step 12, if not, then make the convection transfer rate h under environmental baseline this moment increase Δ h, and jump to step 6.
Step 12, judge whether environment temperature T equals T 2, T 2It is 50 degrees centigrade, if environment temperature T is not equal to T 2, being about to environment temperature T increases Δ T successively, and repeating step 6 is to step 11, up to T=T 2The time, change step 13 over to.Be that flow process is as follows: judge whether environment temperature T equals T 2If,, then jump to step 13, if not, then make the environment temperature T under environmental baseline this moment increase Δ T, and jump to step 6.
Step 13, utilize in the photoelectric composite sea cable redundant single-mode fiber, adopt Brillouin optical time domain analysis (BOTDA, Brillouin Optical Time Domain Analysis) technology is monitored out the temperature of optical fiber in the photoelectric composite sea cable in real time, by inquiry current-carrying capacity database, obtain the current-carrying capacity I of photoelectric composite sea cable under this fiber optic temperature z
Although content of the present invention has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple modification of the present invention with to substitute all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.

Claims (4)

1. composite sea cable current-carrying capacity computing method is characterized in that the method includes the steps of:
Step 1, according to the structural parameters of photoelectric composite sea cable with lay environment, set up the composite sea cable geometric model;
The physical function parameter of each composition material of step 2, input photoelectric composite sea cable;
Step 3, composite sea cable is carried out grid divide, set up the finite element model of photoelectric composite sea cable;
Step 4, according to the environmental baseline of laying of photoelectric composite sea cable, get the environment temperature span for [T 1, T 2], the temperature interval is Δ T; The scope of convection transfer rate is [h 1, h 2], interval delta h;
Step 5, setting original ambient temperature T are T 1, initial convection transfer rate h is h 1
The initial value I of step 6, setting photoelectric composite sea cable working current I 0
Working current I, environment temperature T, the convection transfer rate h of step 7, input photoelectric composite sea cable, the temperature field of calculating photoelectric composite sea cable according to the three-dimensional unstable state heat conduction differential equation in the cartesian coordinate system distributes, and obtains the temperature T of conductor in the photoelectric composite sea cable CWith fiber optic temperature T O
Step 8, judgement | T CWhether-90| greater than ε, if, | T C-t|〉ε, then jump to step 9; If not, | T C-t|≤ε then jumps to step 10; T is the maximum temperature value that the composite sea cable insulating material is allowed continuous firing for a long time, and ε is the allowed error of actual engineering;
Step 9, judgement T CWhether-t greater than 0, if, T C-t〉0, then reduce I 0Value, and jump to step 6; If not, T C-t＜0 then increases I 0Value, and jump to step 6;
Step 10, the current value current-carrying capacity I under the environmental baseline for this reason that gets photoelectric composite sea cable working current I this moment z, and with environment temperature T, convection transfer rate h, current-carrying capacity I at this moment z, fiber optic temperature T OStore in the current-carrying capacity database;
Step 11, judge whether convection transfer rate h equals h 2If,, then jump to step 12, if not, then make the convection transfer rate h under environmental baseline this moment increase Δ h, and jump to step 6;
Step 12, judge whether environment temperature T equals T 2If,, then jump to step 13, if not, then make the environment temperature T under environmental baseline this moment increase Δ T, and jump to step 6;
Redundant single-mode fiber in step 13, the employing photoelectric composite sea cable, and adopt the Brillouin optical time domain analysis technology to monitor out the temperature of optical fiber in the photoelectric composite sea cable in real time, by inquiry current-carrying capacity database, obtain the current-carrying capacity I of photoelectric composite sea cable under this fiber optic temperature z
2. composite sea cable current-carrying capacity computing method as claimed in claim 1 is characterized in that, lay environment in the described step 1 and comprise environment temperature, composite sea cable surrounding medium, the thermal resistivity of soil media, the convection heat transfer situation on fluid and composite sea cable surface; Environment temperature comprises the temperature of temperature, seawater and the air of buried depth place soil; The composite sea cable surrounding medium comprises soil, seawater, air.
3. composite sea cable current-carrying capacity computing method as claimed in claim 1 is characterized in that the physical function parameter of physical function parameter comprises in the described step 2: density, specific heat capacity, heat-conduction coefficient.
4. composite sea cable current-carrying capacity computing method as claimed in claim 1 is characterized in that, the computing formula that the temperature field of calculating photoelectric composite sea cable distributes in the described step 7 is as follows:
Figure 2013102085851100001DEST_PATH_IMAGE001
（1）
In the formula, p is the density of material, units/m3; C is the specific heat of material, the J/ of unit (kg ℃); T is the transient temperature of object, unit ℃; τ is the time that process is carried out, the s of unit; λ is the coefficient of heat conductivity of material, the W/ of unit (m ℃); Qv is the endogenous pyrogen of material, the W/m3 of unit.
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CN103616588A (en) * 2013-11-27 2014-03-05 国网浙江省电力公司舟山供电公司 Method for determining carrying capacity and temperature field of submarine cable
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CN105046002A (en) * 2015-07-23 2015-11-11 上海海事大学 Method for automatically correcting physical property parameter of photoelectric composite submarine cable material
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CN113569435A (en) * 2020-04-29 2021-10-29 上海安馨信息科技有限公司 Photoelectric composite submarine cable buried depth monitoring method

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