Submarine observation network and submarine cable short-circuit fault positioning method based on optical fiber energy transmission

Abstract

The invention relates to a submarine observation network and a submarine cable short-circuit fault positioning method based on optical fiber energy transfer, and belongs to the technical field of submarine cable detection. The positioning method comprises the following steps: (1) supplying power to a detection line constructed by the energy transmission optical fiber; (2) detecting a loop resistance value R1 of a first loop formed by the sea cable section between the adjacent upstream node and the fault point and sea water; (3) detecting loop resistance R2 of a second loop formed by the sea cable section between the head fault node and the fault point and sea water; and (4) based on a formula L1 = 0.5 * (((R1-R2) / K + L), obtaining the distance between the fault point and the adjacent upstream node. Power supply and communication lines are respectively constructed based on the energy transmission optical fiber capable of transmitting low-power electric energy, the communication opticalfiber and the composite optical fiber capable of transmitting high-power electric energy, so that the position of a short-circuit fault point of the submarine cable can be measured more accurately. The method can be widely applied to the field of fault detection of underwater networks such as seabed observation networks.

Description

technical field [0001] The invention relates to the technical field of submarine cable short-circuit fault detection, in particular to a submarine observation network with improved structure and a submarine cable short-circuit fault location method suitable for fault detection of the submarine observation network. Background technique [0002] Such as figure 1 As shown, there is an existing submarine observation network topology with seawater as the pole. As the nodes of the entire network, the shore base station 01, the relay node 02 and the terminal node 03 transmit electric energy and signal communication through submarine cables. Among them, Submarine cables are usually constructed with photoelectric composite cables to transmit communication signals while supplying power; during use, the main fault of submarine cables is the rupture of the protective layer, which causes the cables to directly contact seawater. The short-circuit fault of the submarine cable is caused, a...

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Problems solved by technology

[0004] However, in the actual test process, there are the following defects. Although the resistance on the submarine cable is uniformly distributed, when the protective layer of the submarine cable breaks and comes into contact with seawater, there will also be a certain impedance at the contact point between the submarine cable and seawater. And the resistance value will be difficult to determine due to various conditions, and will continue to change as the surrounding environment changes

In the current fault diagnosis method, the resistance of this part is regarded as 0, and the calculated fault point location will be farther than the actual fault point, resulting in the need to go back from the calculated fault location during the actual search during the maintenance process. Search until the actual fault point is found. The applicant uses this method to calculate the actual deep-sea cable fault point position, and then conducts live search. It is found that the position deviation is usually large, and sometimes there will be a huge deviation, even reaching tens of kilometers. level, resulting in a huge search workload during the maintenance process, which is not conducive to the timely maintenance of submarine cables

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