Flexible optical fiber composite submarine cable and preparation method thereof

Abstract

A flexible optical fiber composite submarine cable comprises four power cable cores, a communication optical cable, an aramid reinforcing rib, a polyurethane filling layer, an inner protecting layer,an aramid braiding layer and a polyurethane outer protecting layer, wherein the power cable cores, the communication optical cable and the aramid reinforcing rib are located in the middle, and the polyurethane filling layer, the inner protecting layer, the aramid braiding layer and the polyurethane outer protecting layer are located on the outer side. The aramid reinforcing rib is arranged at thecenter of a torus formed by the four power cable cores and the communication optical cable; each power cable core comprises a class-V oxygen-free copper flexible conductor, a butyronitrile-PVC compound insulating layer and a copper wire braiding shielding layer in sequence from inside to outside, and each class-V oxygen-free copper flexible conductor is formed by twisting multiple tinned annealedsoft copper wires; a twelve-core optical fiber is arranged in the communication optical cable, and the outer layer of the twelve-core optical fiber is provided with a stainless steel tube, a PE protecting bush and a polyurethane protecting layer in sequence; the polyurethane filling layer is arranged between the inner protecting layer and the power cable cores and the communication optical cable.The flexible optical fiber composite submarine cable has the advantages of being good in waterproofness, flexibility and creep resistance, light in weight, small in size, high in tensile strength andthe like.

Description

technical field [0001] The invention relates to the technical field of DC cables, in particular to a flexible optical fiber composite submarine cable and a preparation method thereof. Background technique [0002] With the in-depth implementation of the country's marine development strategy, the demand for marine cables is becoming more and more diverse. The existing conventional submarine cables cannot meet the needs of flexible DC power transmission in offshore tidal energy, wave energy power generation devices and other marine environments. The existing submarine cables mainly have the following disadvantages: (1) Lead sheath and steel wire armor structure are usually used. The steel wire and lead sheath of this structure are prone to fatigue and fracture in a long-term turbulent environment, and are not suitable for tidal (2) The safe bending radius of the existing submarine cable is 15 or 25 times the diameter of the cable core, while in the process of tidal power gener...

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Problems solved by technology

[0002] With the in-depth implementation of the country's marine development strategy, the demand for marine cables is becoming more and more diverse. The existing conventional submarine cables cannot meet the needs of flexible DC power transmission in offshore tidal energy, wave energy power generation devices and other marine environments.

The existing submarine cables mainly have the following disadvantages: (1) Lead sheath and steel wire armor structure are usually used. The steel wire and lead sheath of this structure are prone to fatigue and fracture in a long-term turbulent environment, and are not suitable for tidal (2) The safe bending radius of the existing submarine cable is 15 or 25 times the diameter of the cable core, while in the process of tidal power generation or wave power generation, the bending radius of the submarine cable is required to be 8 times the cable core diameter. Core diameter or even smaller range, so that the submarine cable will not be interrupted due to excessive bending during the power generation process; (3) The existing submarine cable is heavy due to the design structure of the metal lead sheath

In order to obtain more kinetic energy for tidal energy and wave energy power generation, it is required to reduce the dragging effect on the power generation device during the power generation process, so the submarine cable with metal lead sheath structure is not suitable for wave energy power generation system; (4) for the existing To improve the tensile strength of submarine cables, a single-layer or multi-layer thick round steel wire armor structure is usually used, which not only increases the cost, but more importantly, increases the weight and size of the product, which brings difficulties and troubles to submarine cable laying and maintenance. inconvenient

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