Method for detecting broken point of submarine cable

Abstract

The invention discloses a method for detecting a broken point of a submarine cable. The method includes particular steps of 1), theoretically positioning the broken point of the submarine cable by the time-domain reflection technique; 2), constructing a direct-current circuit by a direct-current power source, a copper core of the submarine cable and seawater at a landing point of the submarine cable to strengthen abnormal distribution of a magnetic field around the submarine cable; and 3), scanning and detecting the magnetic field around the theoretical position of the broken point of the submarine cable by a magnetometer and judging the position of the broken point according to the abnormal distribution of magnetism. The method has the advantages that the theoretical position of the broken point of the submarine cable is determined by the time-domain reflection technique on the basis of an automatic identification system AIS for ships, the direct-current circuit is constructed according to the actual condition of the landing point to strengthen the abnormal distribution of the magnetic field of the submarine cable, and the actual position of the broken point of the submarine cable can be determined by actually measuring the magnetic field by the offshore magnetometer according to the abnormal distribution of the magnetic field, so that reliable evidence can be provided for fishing the broken point of the submarine cable.

Description

technical field [0001] The invention relates to the field of submarine cable detection, in particular to a method for detecting a breakpoint of a submarine cable. Background technique [0002] my country has a long coastline, vast territorial waters, and numerous islands and offshore working platforms. Submarine cables play a key role in ensuring the production and life of island residents and the normal operation of offshore working platforms. [0003] With the increasing activities of marine development and utilization, submarine cables are frequently damaged by anchor dropping, anchoring, fishing, ship towing, shore-based operations, etc., and cable breaking accidents occur frequently. Due to factors such as ship dragging and seawater erosion, the submarine cable has shifted, and the accurate positioning of the breakpoint of the submarine cable and the difficulty of salvaging the broken cable end have affected the emergency repair of the accident and the loss settlement. ...

AI Technical Summary

Problems solved by technology

For submarine cables buried below the seabed surface, side-scan sonar and 3D geomorphology instruments are powerless, and the usual shallow stratum profiler is less effective for detecting submarine cables with a diameter of about 10cm

For the detection and search of submarine cables, magnetometers are currently mainly used to detect magnetic field anomalies for positioning. Due to the influence of submarine ferromagnetic objects and the buried depth of submarine cables, it is difficult to ensure the accuracy of detection, and even the target cannot be detected

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