Exact locating method for fault points of submarine cable

A submarine cable, accurate positioning technology, applied in the fault location, using the pulse reflection method to detect the fault and other directions, can solve the problem of not being able to determine the geographical location of the fault point, and achieve the effect of accurate positioning and high measurement accuracy

Active Publication Date: 2012-10-17
STATE GRID CORP OF CHINA +3
5 Cites 34 Cited by

AI-Extracted Technical Summary

Problems solved by technology

Using optical time domain reflectometer (OTDR) to locate submarine cables is the main method currently used, but OTDR can only measure the distance between the fault point of the optical fiber and the test point, and cannot determine the geographical location of the fault point, especially the excess ...
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Method used

A kind of submarine cable fault point accurate location method as shown in Figure 1-7, it adopts Brillouin distributed strain/temperature measurement technology, by Brillouin distributed optical fiber strain/temperature measurement data and actual submarine cable The status information is fused, and the characteristic information of the submarine cable route is extracted, so as to realize the detection and accurate location of the submarine cable fault point. In order to make the purpose, technical solution and advantages of the present invention clearer, the method for accurately locating the fault of the submarine cable will be described below according to a specific implementation case with reference to the relevant drawings.
[0040] Prepare the as-built drawing of the submarine cable route, the cross-sectional view of the submarine cable route or the topographic map along the laying of the submarine cable, and analyze the standard curve data in detail. Since the strain on the submarine cable is closely related to the terrain, feature points can be extracted through the terrain. Obtain the gradient curve of the terrain, as shown by the black line in Figure 6. The gradient curve has three very obvious peaks, which correspond to the steep points of submarine cable la...
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Abstract

The invention discloses an exact locating method for fault points of a submarine cable. The exact locating method for the fault points of the submarine cable comprises the following steps of: realizing real time online monitoring of the submarine cable by utilizing BOTDR (brillouin optical time domain reflectometer) or BOTDA (brilouin optical time domain analysis); carrying out combined analysis by utilizing strain/temperature information, a submarine topography and geologic structure and construction details carried by a brillouin scattering signal; and extracting feature points, and establishing a database so as to largely improve the location precision. After the database is established, complex data query and calculation operations can be saved as long as a submarine cable has failure, thus the fault position can be quickly and exactly located, the submarine cable can be repaired and the labors and materials are largely saved.

Application Domain

Fault location by pulse reflection methods

Technology Topic

Image

  • Exact locating method for fault points of submarine cable
  • Exact locating method for fault points of submarine cable
  • Exact locating method for fault points of submarine cable

Examples

  • Experimental program(1)

Example Embodiment

[0028] Example 1
[0029] a kind of like Figure 1-7 The accurate location method of the submarine cable fault point shown in the figure uses the Brillouin distributed strain/temperature measurement technology, and extracts the characteristic information of the submarine cable route by fusing the Brillouin distributed optical fiber strain/temperature measurement data with the actual submarine cable status information , so as to realize the detection and accurate location of submarine cable fault points. In order to make the purpose, technical solution and advantages of the present invention clearer, the method for accurately locating the fault of the submarine cable will be described below according to a specific implementation case with reference to the relevant drawings.
[0030] figure 1 It is a connection diagram of using a Brillouin Optical Time Domain Reflectometer (BOTDR) or a Brillouin Optical Time Domain Analyzer (BOTDA) to monitor an optoelectronic composite submarine cable 1 with a single-mode optical fiber 2 online.
[0031] figure 2 It is the connection diagram of using Brillouin Optical Time Domain Reflectometer (BOTDR) or Brillouin Optical Time Domain Analyzer (BOTDA) to monitor the ordinary submarine cable without its own optical fiber online and wind the communication optical cable on the ordinary submarine cable 3 for measurement .
[0032] BOTDR is used to monitor the 110 kV submarine cable composited with 16-core G.652 optical fiber between island A and island B in real time. image 3 shown. In order to prevent damage to the submarine cable caused by anchoring of the moving ship, anchoring is prohibited in the area where the submarine cable is laid, and a no-anchor sign 4 is set up to remind passing ships. The underwater part of the submarine cable with a water depth of 10 meters to 25 meters: buried in the seabed 2 meters, with a certain distance between each other, and 200/12 high-strength shock-absorbing ball dumpling Huff type is added on the exposed bedrock or suspicious reef areas and suspicious pipelines Protected by FRP submarine cable protection tube, covered with concrete cover and rock pile; shallow sea part with water depth of 5m to 10m: protected by 200/12 high-strength shock-absorbing ball dumpling Huff type FRP submarine cable and buried 2.0m below the seabed , with a certain distance between phases; 0 to 5 meters intertidal zone: use 200/12 high-strength shock-absorbing ball dumpling Huff type FRP submarine cable protection tube to protect and bury it 2 meters below the seabed, bedrock exposed and reef areas cannot be used For underwater blasting, use a 200/12 high-strength shock-absorbing ball dumpling Huff-type FRP submarine cable protection tube to protect and fix it with riprap; the land part on the side of island A: lay stone cable trestles, with a distance of 2m; on the side of island B Onshore part: laying of stone cable trestles; onshore part: cable trench depth 0.7m.
[0033] The BOTDR has 8 channels, using channels 1 and 2 to monitor the east-phase submarine cable, channels 3 and 4 to monitor the west-phase submarine cable, and channels 5 and 6 to monitor the middle-phase submarine cable.
[0034] The first step: BOTDR starts to monitor the three-phase submarine cable under normal operation, and records the current value and ambient temperature of the three-phase submarine cable at the same time, and stores them in the background together, obtains the basic data under normal operation of the submarine cable, and establishes the original data file.
[0035] Step 2: Analyze the data files, calculate the average value of N BOTDR measurement curves with the same operating current and ambient temperature in the same channel within a month, remove the influence of random noise, improve the signal-to-noise ratio as much as possible, and obtain the three-phase sea For the average curve of cable monitoring data, see Figure 4. Depend on Figure 4 It can be seen that the length of the composite optical fiber in the eastern phase submarine cable 7 is 3515 meters, the length of the composite optical fiber in the western phase submarine cable 5 is 3410 meters, and the length of the composite optical fiber in the middle phase submarine cable 6 is 3395 m. Except for the difference in length, the three submarine cables have basically the same change pattern, which can eliminate the influence of the submarine cable itself from fabrication, twisting, extrusion, etc. After filtering and denoising the measurement curves of the Dongxiang Submarine Cable Channel 1 at different times of the day and at different temperatures, they are compared, see Figure 5. Depend on Figure 5 It can be seen that the change rule of the submarine cable test data in one day is basically the same, so that the influence of tides, wind waves, etc. can be excluded. Finally, through continuous analysis and comparison, a three-phase submarine cable BOTDR measurement standard curve is established.
[0036] Step 3: Convert the planar coordinates of the key points along the submarine cable provided by the as-built drawing of the submarine cable route into longitude and latitude information, which is convenient for accurate positioning by the Global Positioning System (GPS). Combined with the submarine cable route profile, the longitude-latitude information and depth information of each "5m" submarine cable are fused to establish a "longitude-latitude-depth" three-dimensional information database for each point of the submarine cable "5m". Of course, since the spatial resolution of the BOTDR is up to 1m, the limit accuracy of the above three-dimensional information database can reach 1m.
[0037] The optical cable is stranded in the submarine cable at a certain pitch, and the actual length of the optical cable should be calculated according to the diameter and pitch of the submarine cable. Compared with the submarine cable diameter of 114.7mm, the optical cable diameter of 2.5mm can be ignored, and the optical fiber length is equal to the optical cable length, so as to establish the optical fiber length and "latitude-longitude-depth" three-dimensional information database of the three submarine cables, which lays a solid foundation for feature point extraction and fault location. Base.
[0038] Since the optical cable is stranded in the submarine cable at a certain pitch, according to the pitch error provided by the submarine cable manufacturer, the error of the pitch is 10%, and the length of the optical fiber is greater than the length of the optical cable. The length of the optical fiber and the "latitude-longitude-depth" information have a large error. In order to obtain the accurate correspondence between the length of the optical fiber and the "latitude-longitude-depth", the database needs to be further revised.
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