Exact locating method for fault points of submarine cable

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.

Description

technical field [0001] The invention relates to a method for locating cable fault points, in particular to a method for accurately locating submarine cable fault points. [0002] Background technique [0003] my country has a coastline of 32,000 kilometers, more than 6,500 large and small islands, and a territorial sea area of ​​about 4.73 million square kilometers. There are many offshore working platforms. Submarine cables are used in remote power supply, high-voltage power transmission, power communication, signal transmission, and guarantee the production and life of island residents. It plays a key role in the normal operation of offshore working platforms. [0004] Submarine cables are wires wrapped in insulating material and laid on the seabed for power and information transmission. According to the use, it can be divided into power cables, photoelectric composite cables, communication optical cables, etc. In recent years, photoelectric composite subm...

AI 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 length of the optical fiber, the line Factors such as coiled cables and uneven line routing will have a great impact on the location of fault points. The location accuracy of land optical cables can reach 40-50 meters, and the location accuracy of submarine cables can only reach a few hundred meters.

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