CN210108389U - Offshore simulation experiment device for temperature stress of submarine cable - Google Patents
Offshore simulation experiment device for temperature stress of submarine cable Download PDFInfo
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- CN210108389U CN210108389U CN201921010752.0U CN201921010752U CN210108389U CN 210108389 U CN210108389 U CN 210108389U CN 201921010752 U CN201921010752 U CN 201921010752U CN 210108389 U CN210108389 U CN 210108389U
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Abstract
The utility model discloses a submarine cable temperature stress on-shore simulation experiment device, including the optical fiber dish, optical fiber temperature strain analyzer, constant temperature oven to and high accuracy displacement platform, the length through changing the optical fiber dish can enough simulate different length, also can simulate the trouble of different positions, constant temperature oven simulation temperature trouble, high accuracy displacement platform simulation strain trouble. A large amount of cost is saved, and a basis is provided for actual submarine cable fault monitoring. The utility model discloses utilize the constant temperature oven to place the optic fibre of different length, can realize verifying current optic fibre temperature strain analyzer's spatial distribution rate, utilize the accurate temperature variation of control constant temperature oven, the accurate change that high accuracy displacement platform met an emergency can verify each functional accuracy degree of accuracy of optic fibre temperature strain branch appearance. The utility model discloses an actual submarine cable installation optic fibre temperature strain divides the appearance to provide reliable data foundation, has avoided the later stage to dismantle optic fibre temperature strain to divide the loaded down with trivial details of appearance, has practiced thrift a large amount of costs.
Description
Technical Field
The utility model belongs to the technical field of cable state monitoring, concretely relates to submarine cable temperature stress shore simulation experiment device.
Background
No matter the submarine cable is damaged by external force or the internal insulation or other reasons are abnormal, the submarine cable can be known in time only by online monitoring of the submarine cable body. At present, the only online monitoring mode of a submarine cable body of a Hainan networking system is temperature online monitoring, the method is single, faults occur frequently, and usability is poor. Partial discharge in submarine cable insulation online monitoring conducted by southern network research institute in 2013 is limited to monitoring terminals on two sides. Therefore, for a submarine cable body with a length of 31km of three phases, the running state and the health level of the submarine cable body cannot be accurately mastered at the present stage in the running process, and a large error also occurs in risk assessment of equipment.
At present, for a three-phase 31km submarine cable of a Hainan networking system, the operating states and the health levels of the temperature and the stress are controlled only in a limited way, so that the on-line monitoring of the operating states of the submarine cable and the stress body by means of an optical cable bound by a submarine cable body is researched by utilizing an optical fiber sensing principle, and the submarine cable is complex in general, difficult to perform submarine cable body experiments and high in cost. The increasing activity of ocean development, the influence of aquaculture, fishing nets, ship anchors and the like in sea areas on the operation of submarine cables cannot be ignored, mechanical faults of the submarine cables occur sometimes, and the faults can be generally reflected as the change of the strain of the submarine cables. 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 temperature stress shore simulation experiment device.
The utility model discloses a following technical scheme realizes:
an onshore simulation experiment device for temperature stress of a submarine cable comprises an optical fiber disc, an optical fiber temperature strain analyzer, a constant-temperature oven and a high-precision displacement platform; wherein the content of the first and second substances,
during measurement, one end of an optical fiber in the optical fiber disc to be measured is connected with the transmitting end of the optical fiber temperature strain analyzer, the other end of the optical fiber is sequentially connected with the optical fiber placed in the constant-temperature oven and the optical fiber fixed on the high-precision displacement platform, and finally the optical fiber is connected with the receiving end of the optical fiber temperature strain analyzer to form another optical path; simulating the actual submarine cable running distance by changing the length of the access optical fiber disc; carrying out space distribution rate test and temperature fault simulation on the optical fiber temperature strain analyzer by using the optical fiber placed in the constant-temperature oven and the optical fiber outside the bath; the strain magnitude of the optical fiber is changed by utilizing a high-precision displacement platform to simulate a strain fault; the optical fiber temperature strain analyzer is used for acquiring Brillouin displacement frequency shifts at different positions at different moments.
The utility model discloses further improvement lies in, and the optical fiber dish that awaits measuring can simulate according to the length of actual submarine cable behavior, can carry out temperature and meet an emergency fault simulation in different positions around the optical fiber dish moreover.
The utility model discloses further improvement lies in, through placing the optic fibre of different length inside and outside the constant temperature oven, verifies space distribution rate, temperature resolution ratio and the temperature trouble of current equipment behind optic fibre dish length.
The utility model discloses further improvement lies in, through fixing the optic fibre on high accuracy displacement platform, controls the different displacement of high accuracy displacement platform, realizes the resolution ratio of meeting an emergency and meeting an emergency trouble behind optical fiber disc length.
The utility model discloses following profitable technological effect has:
the utility model provides a pair of submarine cable temperature stress shore simulation experiment device, including the optical fiber dish, optical fiber temperature strain analyzer, constant temperature oven to and high accuracy displacement platform, the length through changing the optical fiber dish can enough simulate different length, also can simulate the trouble of different positions, constant temperature oven simulation temperature trouble, high accuracy displacement platform simulation strain trouble. A large amount of cost is saved, and a basis is provided for monitoring temperature stress faults of the actual submarine cable.
To sum up, the utility model discloses utilize the constant temperature oven to place the optic fibre of different length, can realize verifying current optic fibre temperature strain analyzer's spatial distribution rate, utilize the accurate temperature variation of control constant temperature oven, each functional accuracy degree of the appearance is divided to the accurate change that high accuracy displacement platform met an emergency, can have verified optic fibre temperature strain. Therefore, a reliable data basis is provided for the optical fiber temperature strain analyzer installed on the actual submarine cable, the trouble of disassembling the optical fiber temperature strain analyzer in the later period is avoided, and a large amount of cost is saved.
Drawings
Fig. 1 is the utility model discloses a submarine cable temperature stress shore simulation experiment device schematic diagram.
Fig. 2 is a schematic diagram of a short-range spatial distribution ratio test.
Fig. 3 is a schematic diagram of a long-distance spatial distribution ratio test.
FIG. 4 is a schematic view of fiber placement in a thermostatic oven.
Fig. 5 is a schematic structural diagram of the fixed high-precision displacement platform.
FIG. 6 is a graph of a short-range spatial distribution ratio test; wherein FIG. 6(a) is a spatial resolution test graph for a test fiber of 1m, and FIG. 6(b) is a spatial resolution test graph for a test fiber of 2 m.
FIG. 7 is a graph of a long-range spatial distribution ratio test; in which fig. 7(a) is a test graph of spatial resolution of a 31km optical fiber, and fig. 7(b) is a partial graph of a test optical fiber 100 m.
Fig. 8 is a block diagram of the offshore simulation experiment detection of the submarine cable.
Description of reference numerals:
1 is an optical fiber disc, 2 is an optical fiber temperature strain analyzer, 3 is a constant temperature oven, and 4 is a high-precision displacement platform; 301 is room temperature, 302 is greater than room temperature by 20 ℃, 303 is short distance fiber length, 304 is long distance fiber length, 305 is current spatial distribution ratio fiber length, 306 is less than spatial distribution ratio fiber length, 307 is greater than 2 times current spatial distribution ratio fiber length, 308 is much greater than current spatial distribution ratio fiber length.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
As shown in figure 1, the utility model provides a pair of submarine cable temperature stress shore simulation experiment device, including optical fiber dish 1, optical fiber temperature strain analyzer 2, constant temperature oven 3 to and high accuracy displacement platform 4.
During measurement, one end of an optical fiber in the optical fiber tray 1 to be measured is connected with the transmitting end of the optical fiber temperature strain analyzer 2, the other end of the optical fiber is sequentially connected with the optical fiber placed in the constant-temperature oven 3 and the optical fiber fixed on the high-precision displacement platform 4, and finally the optical fiber is connected with the receiving end of the optical fiber temperature strain analyzer 2 to form another optical path; simulating the actual submarine cable running distance by changing the length of the access optical fiber disc 1; carrying out space distribution rate test and temperature fault simulation on the optical fiber temperature strain analyzer 2 by using the optical fiber placed in the constant temperature oven 3 and the optical fiber outside the bath; the strain magnitude of the optical fiber is changed by using the high-precision displacement platform 4 to simulate a strain fault; the optical fiber temperature strain analyzer 2 is used for acquiring Brillouin displacement frequency shifts at different positions at different moments.
As shown in fig. 4, the utility model provides a pair of submarine cable temperature stress shore simulation experiment device, during the experiment, including following step:
1) as shown in fig. 2, firstly, a short-distance spatial distribution rate experiment is performed, 1m and 2m bare fibers are respectively placed in a constant-temperature oven 3 to ensure that the fibers are in a free loose state, and the fiber temperature and strain analyzer 2 is used for measurement;
2) as shown in fig. 3, a long-distance spatial distribution rate experiment is performed, a 31km optical fiber disc is connected to the emission end of the optical fiber temperature strain analyzer 2, then 100m bare optical fibers are respectively placed in a constant-temperature oven 3, the optical fibers are ensured to be in a free loose state, and the optical fiber temperature strain analyzer 2 is used for measurement;
3) as shown in fig. 4, optical fibers with different lengths are sequentially placed in a constant temperature oven 3, so as to ensure that the optical fibers are in a free loose state; wherein 301 is greater than room temperature by 20 ℃, 302 is room temperature, 303 is the current spatial distribution rate optical fiber length, 304 is less than the spatial distribution rate optical fiber length, 305 is greater than 2 times the current spatial distribution rate optical fiber length, and 306 is much greater than the current spatial distribution rate optical fiber length;
4) as shown in fig. 3, optical fibers with different lengths are fixed on the high-precision displacement platform 4, and the optical fiber state on the high-precision displacement platform 4 is ensured to be in a tight state;
5) one end of an optical fiber in the optical fiber disc 1 to be tested is connected with the transmitting end of the optical fiber temperature strain analyzer 2, the other end of the optical fiber is sequentially connected with the optical fiber placed in the constant temperature oven 3 and the optical fiber fixed on the high-precision displacement platform 4, and finally the optical fiber is connected with the receiving end of the optical fiber temperature strain analyzer 2 to form another optical path;
6) and changing the temperature of the constant-temperature oven 3 and the displacement of the high-precision displacement platform 4, and recording the Brillouin displacement frequency shift measured by the optical fiber temperature strain analyzer 2 under different conditions.
Specifically, the results of the short-distance spatial distribution ratio test experiments of steps 1)1m and 2m are processed to obtain a graph of temperature and fiber length as shown in fig. 6.
Step 2) a space distribution rate test experiment for a long distance of 31km, and a graph of temperature and optical fiber length obtained by processing the result is shown in fig. 7.
And 3) sequentially putting the optical fiber length equal to the current spatial distribution rate, far longer than the current spatial distribution rate, shorter than the spatial distribution rate, far longer than the current spatial distribution rate and longer than 2 times the current spatial distribution rate into the constant-temperature oven 3 to obtain curves in different shapes.
And step 5), the optical fiber disc 1 to be tested can be simulated according to the length of the actual submarine cable running condition, and temperature strain fault simulation can be carried out at different positions in front of and behind the optical fiber disc 1.
And 6) respectively fixing the lengths of 1m, 2m and 3m of the optical fibers on the high-precision displacement platform 4, and simulating 100 mu epsilon, 200 mu, 300 mu epsilon, 400 mu epsilon and 500 mu epsilon by moving the high-precision displacement platform 4 for 0.1mm, 0.2mm, 0.3mm, 0.4mm and 0.5 mm. The temperature of the constant temperature oven is changed to be more than room temperature of 20 ℃, 30 ℃, 40 ℃, 50 ℃ and 60 ℃.
And 6) the relationship between the Brillouin frequency shift and the temperature and the strain of the optical fiber 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 of the optical fiber temperature strain analyzer in the optical fiber to be measured, epsilon0And epsilon is the strain value, T, of the optical fiber measured after stabilization on the high-precision displacement platform0T is the temperature value of the optical fiber measured after the temperature of the constant temperature oven to be measured is stable, CvT、CvεThe Brillouin frequency shift temperature coefficient and the Brillouin frequency shift strain coefficient are respectively used.
Claims (4)
1. An onshore simulation experiment device for temperature stress of submarine cables is characterized by comprising an optical fiber disc (1), an optical fiber temperature strain analyzer (2), a constant temperature oven (3) and a high-precision displacement platform (4); wherein the content of the first and second substances,
during measurement, one end of an optical fiber in the optical fiber tray (1) to be measured is connected with the transmitting end of the optical fiber temperature strain analyzer (2), the other end of the optical fiber is sequentially connected with the optical fiber placed in the constant temperature oven (3) and the optical fiber fixed on the high-precision displacement platform (4), and finally the optical fiber is connected with the receiving end of the optical fiber temperature strain analyzer (2) to form another optical path; the actual submarine cable running distance is simulated by changing the length of the access optical fiber disc (1); carrying out space distribution rate test and temperature fault simulation on the optical fiber temperature strain analyzer (2) by using the optical fiber placed in the constant-temperature oven (3) and the optical fiber outside the bath; the strain magnitude of the optical fiber is changed by utilizing the high-precision displacement platform (4) to simulate a strain fault; the optical fiber temperature strain analyzer (2) is used for acquiring Brillouin displacement frequency shifts at different positions at different moments.
2. The offshore simulation experiment device for temperature stress of submarine cables according to claim 1, wherein the optical fiber disc (1) to be tested can be simulated according to the length of the actual submarine cable running condition, and temperature strain fault simulation can be performed at different positions in front of and behind the optical fiber disc (1).
3. The offshore simulation experiment device for temperature stress of submarine cables according to claim 1, wherein the spatial distribution rate, temperature resolution and temperature fault of the current equipment passing through the length of the optical fiber tray (1) are verified by optical fibers with different lengths placed inside and outside the constant temperature oven (3).
4. The offshore simulation experiment device for temperature stress of submarine cables according to claim 1, wherein the strain resolution and strain fault after passing through the length of the optical fiber disc (1) are realized by controlling different displacements of the high-precision displacement platform through the optical fibers fixed on the high-precision displacement platform (4).
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| CN201921010752.0U CN210108389U (en) | 2019-06-28 | 2019-06-28 | Offshore simulation experiment device for temperature stress of submarine cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110186489A (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 temperature stress imitative experimental appliance and method on the bank |
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- 2019-06-28 CN CN201921010752.0U patent/CN210108389U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110186489A (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 temperature stress imitative experimental appliance and method on the bank |
| CN110186489B (en) * | 2019-06-28 | 2023-12-15 | 中国南方电网有限责任公司超高压输电公司广州局 | Submarine cable temperature stress onshore simulation experiment device and method |
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Effective date of registration: 20230810 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 |
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