CN210222163U - Offshore simulation experiment device for current-carrying capacity of submarine cable - Google Patents
Offshore simulation experiment device for current-carrying capacity of submarine cable Download PDFInfo
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- CN210222163U CN210222163U CN201921010695.6U CN201921010695U CN210222163U CN 210222163 U CN210222163 U CN 210222163U CN 201921010695 U CN201921010695 U CN 201921010695U CN 210222163 U CN210222163 U CN 210222163U
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Abstract
The utility model discloses a submarine cable current-carrying capacity shore simulation experiment device, including thermocouple, temperature acquisition module, optic fibre temperature strain analyzer, cross-core transformer to and current transformer, be used for simulating the structure that the optical cable was binded to actual submarine cable, can simulate actual submarine cable behavior through the shore simulation experiment, and the cost has been practiced thrift to the structure that the optical cable was binded to actual submarine cable has just so analogized. The utility model discloses a cable is binded the measurement of optical cable and each position temperature of optical cable under different electric currents to calculate the relation of temperature and electric current, and carry out analog simulation through COMSOL emulation software, contrast with the experimental result, provide thinking and revised method for the model construction that carries out of submarine cable actual monitoring current-carrying capacity jointly; and the feasibility of the method for monitoring the cable temperature and estimating the current-carrying capacity by using the temperature of the optical fiber in the optical cable is verified, so that the method and the device for monitoring the actual optical cable structure bound by the submarine cable are provided.
Description
Technical Field
The utility model belongs to the technical field of cable state monitoring, concretely relates to submarine cable current-carrying capacity shore simulation experiment device.
Background
When the submarine cable runs normally, the temperature and the stress of the conductor are very important parameters, and the real-time temperature of the conductor determines the current carrying capacity of the submarine cable. In addition, if the working temperature of the submarine cable is too high, the aging of the insulating material is accelerated, the service life of the submarine cable is shortened, and even faults occur in serious cases; in the development process of the tiny defect in the submarine cable, abnormal heating can be accompanied, the temperature of a defect point can be increased, and the insulation aging is accelerated in severe cases, so that thermal breakdown is caused.
At present, for a three-phase 31km submarine cable of a Hainan networking system, the operating state and the health level of the temperature and the stress are controlled only in a limited way, so that the research on how to realize the on-line monitoring of the temperature of the submarine cable and the calculation of the current-carrying capacity by depending on an optical cable bound by a submarine cable body is of great importance by utilizing an optical fiber sensing principle. Because the submarine cable is generally complicated, the experiment of the submarine cable body is difficult to perform, and the cost is high. Therefore, the existing testing device cannot simulate the experimental measurement on the shore of the submarine cable, which is a technical problem to be solved by the technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to the not enough of above-mentioned prior art, provide a submarine cable current-carrying capacity shore simulation experiment device.
The utility model discloses a following technical scheme realizes:
an onshore simulation experiment device for the current-carrying capacity of a submarine cable comprises a thermocouple, a temperature acquisition module, an optical fiber temperature strain analyzer, a voltage regulator, a feed-through transformer and a current transformer; wherein the content of the first and second substances,
during measurement, holes are formed in the cable and the optical cable; the thermocouples are respectively fixed at corresponding positions by conductive adhesive and are used for measuring the temperature change of the cable and the optical cable at each position under different current magnitudes at different moments; the cable binding optical cable to be tested penetrates through the core-through transformer and the current transformer, and conductors at two ends of the cable binding optical cable to be tested are connected to form a power-on loop; one end of an optical fiber in the optical cable to be tested is connected with the transmitting end of the optical fiber temperature strain analyzer, and the receiving end of the optical fiber temperature strain analyzer at the other end is connected to form another optical path; the voltage of the through transformer is regulated by a voltage regulator so as to change the current generated by binding the optical cable to the cable to be tested; the thermocouple is connected with the temperature acquisition module, and the temperature acquisition module is used for storing temperature values of each layer structure of the cable binding optical cable to be measured, which are measured by the thermocouple at different moments; the optical fiber temperature strain analyzer is used for acquiring Brillouin displacement frequency shifts of different positions of the cable binding optical cable to be detected at different moments.
The utility model discloses a further improvement lies in, the cable that awaits measuring includes the copper conductor that from interior to exterior set gradually, and is insulating, the copper strips, the steel band armor to and fire-retardant oversheath.
The utility model discloses a further improvement lies in, the optical cable includes from interior to exterior the light unit that sets gradually, the interior sheath of polyethylene, first layer steel wire armor, second floor steel wire armor to and outer tegument.
The utility model discloses following profitable technological effect has:
the utility model provides a pair of submarine cable current-carrying capacity ashore simulation experiment device, including the thermocouple, the temperature acquisition module, optic fibre temperature strain analyzer, the punching transformer, current transformer, the operational aspect of optical cable structure is binded to the actual submarine cable of simulation that can be simple, can simulate actual submarine cable operational aspect through the simulation experiment on the shore, has just so analogized actual condition submarine cable and binded the structure of optical cable, has carried out scientific simplification with the more complicated problem of actual submarine cable, avoids using the complexity of actual submarine cable experiment, has practiced thrift a large amount of costs.
In summary, the actual structure of the submarine cable is complex, so that the experiment is difficult and the cost is high. The utility model realizes the measurement of the temperature of the cable and the optical cable under different currents and the calculation of the relation between the temperature and the current, and utilizes COMSOL simulation software to carry out simulation, and compared with the experimental result, the utility model provides the thinking and the correction method for the model construction of the actual current-carrying capacity monitoring of the submarine cable; and the feasibility of the method for monitoring the cable temperature and estimating the current-carrying capacity by using the temperature of the optical fiber in the optical cable is verified, so that the method and the device for monitoring the actual optical cable structure bound by the submarine cable are provided.
Drawings
Figure 1 is the utility model relates to a submarine cable current-carrying capacity shore simulation experiment device schematic diagram.
Fig. 2 is a schematic structural diagram of a cable bundle to be tested.
FIG. 3 is a simulation in COMSOL; fig. 3(a) shows the simulation result of the whole cable-bound cable structure, and fig. 3(b) shows the simulation result of the optical cable.
FIG. 4 is a graph of experimental results of temperature at different locations of a cable-bound cable structure at different currents.
Fig. 5 is a block diagram of offshore simulation experiment detection of current-carrying capacity of a submarine cable.
Description of reference numerals:
the system comprises a thermocouple 1, a temperature acquisition module 2, an optical fiber temperature strain analyzer 3, a voltage regulator 4, a feed-through transformer 5, a current transformer 6, a cable 7 and an optical cable 8, wherein the thermocouple is arranged in the center of the fiber; 701 is a copper conductor, 702 is insulation, 703 is a copper strip, 704 is steel tape armor, 705 is a flame retardant outer sheath, 801 is a light unit, 802 is a polyethylene inner sheath, 803 is a first layer of steel wire armor, 804 is a second layer of steel wire armor, and 805 is an outer sheath.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the utility model provides a pair of submarine cable current-carrying capacity shore simulation experiment device, including thermocouple 1, temperature acquisition module 2, optic fibre temperature strain analyzer 3, voltage regulator 4, punching transformer 5 to and current transformer 6.
During measurement, firstly, the cable 7 and the optical cable 8 are perforated by utilizing electric transfer according to the method shown in figure 2; after punching, fixing the thermocouple 1 at corresponding positions by using conductive adhesive respectively, and measuring the temperature change of each position of the cable 7 and the optical cable 8 at different moments and with different current magnitudes; the cable 7 to be tested is bundled with the optical cable 8 and passes through the feed-through transformer 5 and the current transformer 6, and the structure of the cable 7 to be tested is connected with the conductors at two ends as shown in figure 2 to form a power-on loop; one end of an optical fiber in the optical cable 8 to be tested is connected with the transmitting end of the optical fiber temperature strain analyzer 3, and the receiving end of the optical fiber temperature strain analyzer 3 at the other end is connected to form another optical path; the voltage of the through transformer 5 is regulated by the voltage regulator 4 so as to change the current generated by binding the optical cable 8 on the cable 7 to be tested; the thermocouple 1 is connected with the temperature acquisition module 2, and the temperature acquisition module 2 is used for storing temperature values of structures of each layer of the cable 7 binding optical cable 8 to be measured, which are measured by the thermocouple 1 at different moments; the optical fiber temperature strain analyzer 3 is used for acquiring Brillouin displacement frequency shifts of different positions of the cable 7 to be measured binding optical cable 8 at different moments.
As shown in fig. 4, the utility model provides a pair of submarine cable current-carrying capacity shore simulation experiment device, during the experiment, including following step:
1) a cable 7 to be tested is bundled with an optical cable 8 to pass through the feed-through transformer 5, and conductors at two ends of the cable 7 to be tested and the optical cable 8 are connected to form a power-on loop; punching holes in advance on the cable 7 to be measured and the optical cable 8, wherein the punching depth is matched with the structures of the cable 7 and the optical cable 8, placing the thermocouples 1 in the holes, and measuring the temperature of the cable 7 to be measured and the optical cable 8 binding positions at different moments;
2) connecting one end of an optical fiber in the optical cable 7 to be tested with the transmitting end of the optical fiber temperature strain analyzer 3, and connecting the other end of the optical fiber in the optical cable to be tested with the receiving end of the optical fiber temperature strain analyzer 3 to form another optical path;
3) the current passing through the cable 7 to be tested and the optical cable 8 are changed, and the temperature measured by the thermocouple under different currents and the Brillouin displacement frequency shift measured by the optical fiber temperature strain analyzer 3 under different conditions are recorded;
4) according to the relation of Brillouin frequency shift, temperature and strain, the temperature and current relations of the cable 7 and the optical cable 8 layers under different currents of the cable 8 binding optical cable 7 to be tested at the same moment are obtained;
5) and the experimental results of cable 8 bundled with cable 7 are compared with the simulation results in the COMSOL simulation software.
Step 1) binding an optical cable 8 by using a cable 7 to be tested as a research object, wherein the cable 7 to be tested comprises a copper conductor 701, an insulation 702, a copper strip 703, a steel strip armor 704 and a flame-retardant outer sheath 705 which are sequentially arranged from inside to outside, and the optical cable 8 comprises an optical unit 801, a polyethylene inner protective layer 802, a first steel wire armor 803, a second steel wire armor 804 and an outer coating layer 805 which are sequentially arranged from inside to outside. The schematic diagram of the structure to be tested is shown in fig. 2. And (4) punching holes in the cable 7 to be tested and the optical cable 8, and punching the holes to the positions of each layer as far as possible. And the thermocouple 1 is respectively contacted with the steel tape armor 801, the flame-retardant outer sheath 802, the copper strip 803, the copper conductor 804, the insulation 805, the conductor shielding layer 806, the outer sheath layer 801, the first layer of steel wire armor 802, the optical unit 803, the polyethylene inner sheath 804 and the second layer of steel wire armor 805, and the temperature of each structure of the cable 7 and the optical cable 8 to be measured is measured. The thermocouple 1 is connected with the temperature acquisition module 2, and stores temperature values of structures of the cable 7 and the optical cable 8 to be measured, which are measured by the thermocouple 1 at different moments.
And 2) welding the optical cable 7 by using an optical fiber welding machine, setting the sampling interval and the spatial distribution rate of the optical fiber temperature strain analyzer 3 to be less than the length of the cable, testing by trying various spatial distribution rates, and comparing results of different spatial distribution rates.
And step 3) adjusting the induced current in the cable 7 through the voltage regulator 4, observing the current value of the current transformer 6, keeping the current value at 100A, 200A, 300A and 400A respectively, recording Brillouin frequency shift in the optical fiber temperature strain analyzer 3 at different moments, and recording the numerical values of the thermocouples 1 at different positions in the temperature acquisition module 2, wherein the experimental result is shown in fig. 5.
And 4) the optical fiber temperature strain analyzer 3 can measure Brillouin frequency shifts of different positions of the optical fibers in the cable 7 and the optical cable 8 to be measured after conductors under different currents are stable, and the relationship between the Brillouin frequency shifts and the temperature and strain of the optical fibers at the same moment is shown as the formula (1):
vB(T,ε)＝vB(T0,ε0)+CυT(T-T0)+Cυε(ε-ε0) (1)
wherein v isB(T0,ε0)、vB(T, epsilon) is the frequency shift quantity of Brillouin scattering light in the optical fiber in the cable obtained by measuring the temperature stability of the conductors in the cable 7 and the optical cable 8 to be measured by the optical fiber temperature strain analyzer after the conductors have no current and have current and the conductors have stable temperature0Epsilon is the strain value of the optical fiber in the cable obtained by measuring the temperature of the conductor with no current and current in the cable 7 and the optical cable 8 to be measured, and T is the strain value of the optical fiber in the cable0T is the temperature value of the optical fiber in the cable obtained by measuring the temperature of the conductor in the cable 7 and the optical cable 8 to be measured after the conductor has no current and the conductor has current and the temperature of the conductor is stable, CvT、CvεThe Brillouin frequency shift temperature coefficient and the Brillouin frequency shift strain coefficient are respectively used.
And step 5) carrying out modeling simulation on the structure shown in the figure 2 in COMSOL simulation software, wherein the set environment temperature is the environment temperature during experiment, the surrounding environment is air, and the current of the copper conductor is respectively 100A, 200A, 300A, 400A and 500A, so as to obtain the temperature value of each layer of structure of the cable 7 binding optical cable 8 in a steady state.
Claims (3)
1. An onshore simulation experiment device for the current-carrying capacity of a submarine cable is characterized by comprising a thermocouple (1), a temperature acquisition module (2), an optical fiber temperature strain analyzer (3), a voltage regulator (4), a feed-through transformer (5) and a current transformer (6); wherein the content of the first and second substances,
during measurement, holes are formed in the cable (7) and the optical cable (8); the thermocouples (1) are respectively fixed at corresponding positions by conductive adhesive and are used for measuring the temperature change of each position of the cable (7) and the optical cable (8) at different moments and with different current magnitudes; the binding optical cable (8) of the cable (7) to be tested penetrates through the feed-through transformer (5) and the current transformer (6), and conductors at two ends of the binding optical cable (8) of the cable (7) to be tested are connected to form a circuit; one end of an optical fiber in the optical cable (8) to be tested is connected with the transmitting end of the optical fiber temperature strain analyzer (3), and the receiving end of the optical fiber temperature strain analyzer (3) at the other end is connected to form another optical path; the voltage of the through transformer (5) is regulated by the voltage regulator (4) so as to change the current generated by the binding optical cable (8) of the cable (7) to be tested; the thermocouple (1) is connected with the temperature acquisition module (2), and the temperature acquisition module (2) is used for storing temperature values of all layer structures of the cable (7) to be tested and the binding optical cable (8) measured by the thermocouple (1) at different moments; the optical fiber temperature strain analyzer (3) is used for acquiring Brillouin displacement frequency shifts of different positions of a cable (7) to be measured and a binding optical cable (8) at different moments.
2. The offshore simulation experiment device for current-carrying capacity of the submarine cable according to claim 1, wherein the cable (7) to be tested comprises a copper conductor (701), an insulation (702), a copper strip (703), a steel tape armor (704) and a flame-retardant outer sheath (705) which are arranged in sequence from inside to outside.
3. The offshore simulation experiment device for current carrying capacity of submarine cables according to claim 1, wherein the optical cable (8) comprises an optical unit (801), a polyethylene inner sheath (802), a first layer of steel wire armor (803), a second layer of steel wire armor (804), and an outer sheath layer (805) which are arranged in sequence from inside to outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921010695.6U CN210222163U (en) | 2019-06-28 | 2019-06-28 | Offshore simulation experiment device for current-carrying capacity of submarine cable |
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| CN201921010695.6U CN210222163U (en) | 2019-06-28 | 2019-06-28 | Offshore simulation experiment device for current-carrying capacity of submarine cable |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110187216A (en) * | 2019-06-28 | 2019-08-30 | 中国南方电网有限责任公司超高压输电公司广州局 | A kind of submarine cable current-carrying capacity imitative experimental appliance and method on the bank |
| CN111896839A (en) * | 2020-07-14 | 2020-11-06 | 国核电力规划设计研究院有限公司 | Platform and method for testing current-carrying capacity of submarine cable in temperature field |
-
2019
- 2019-06-28 CN CN201921010695.6U patent/CN210222163U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110187216A (en) * | 2019-06-28 | 2019-08-30 | 中国南方电网有限责任公司超高压输电公司广州局 | A kind of submarine cable current-carrying capacity imitative experimental appliance and method on the bank |
| CN111896839A (en) * | 2020-07-14 | 2020-11-06 | 国核电力规划设计研究院有限公司 | Platform and method for testing current-carrying capacity of submarine cable in temperature field |
| CN111896839B (en) * | 2020-07-14 | 2023-05-23 | 国核电力规划设计研究院有限公司 | Submarine cable temperature field current-carrying capacity testing platform and method |
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Effective date of registration: 20230720 Address after: 570000 Unit B, 14 #, Fortune Plaza, 103 Binhai Avenue, Haikou City, Hainan Province Patentee after: Haikou Branch of Guangzhou Bureau of China Southern Power Grid Co.,Ltd. Patentee after: XI'AN JIAOTONG University Address before: 510670 Guangzhou Bureau of Extra High Voltage Transmission Company of China Southern Power Grid Co., Ltd. in Guangzhou, Guangdong Province Patentee before: GUANGZHOU BUREAU OF EXTRA HIGH VOLTAGE TRANSMISSION COMPANY OF CHINA SOUTHERN POWER GRID Co.,Ltd. Patentee before: XI'AN JIAOTONG University |