Dry-type insulation submarine optical cable

Abstract

The invention provides a dry-type insulation submarine optical cable. The dry-type insulation submarine optical cable comprises a stainless steel optical fiber unit located in the center, and a conductive unit, a first semi-conductive water-blocking tape, a conductor shielding layer, an insulating layer, an insulation shielding layer, a second semi-conductive water-blocking tape, a lead sleeve, an outer protection layer, an armor layer and an outer coating layer which are sequentially arranged on the outer side of the stainless steel optical fiber unit from inside to outside; and the conductive unit is formed by twisting copper wires outside the stainless steel optical fiber. Compared with a traditional submarine optical cable, the dry-type insulated submarine optical cable has the advantages that the insulating layer is isolated from the armor layer, the lead sleeve and the outer protective layer are added to protect the insulating layer, the insulating layer is not in direct contact with water during working, the problem that the insulating performance is reduced due to seawater infiltration can be effectively solved, the service life of the submarine optical cable is prolonged, and the conductive unit is formed by twisting the copper wires, so that the cable has smaller conductor direct current resistance, can realize farther transmission distance, and is used for a higher voltage class system.

Description

technical field [0001] The invention relates to the technical field of submarine optical cables, in particular to a dry insulated submarine optical cable that can be used in high voltage level systems. Background technique [0002] Submarine optical cable is the "skeleton" of today's global Internet. It is mainly used for communication transmission between continents, between islands and continents, and between islands. In order to achieve long-distance communication, submarine optical cables generally adopt a relay structure. The system It needs to be energized to run. The basic principle is to convert the standard power into a constant current and a voltage of thousands of volts or even tens of thousands of volts to power the submarine equipment of the submarine optical cable system through a microprocessor-based control system. The low-resistance conductive unit in the power supply line is beneficial for the submarine optical cable to have a longer transmission distance a...

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Problems solved by technology

[0006] During the armoring process of the armored steel wire, the surface of the insulating layer and the gaps between the steel wires need to be filled with asphalt. When filling the asphalt, a high temperature of over 160°C is required, which is easy to burn the insulating layer. The conventional submarine cable insulation extrusion production line is arranged horizontally. Due to the influence of the material's own weight, It is impossible to realize large-thickness insulation extrusion. It has been verified by experiments that an obvious ellipse phenomenon will appear when the thickness of the insulation layer exceeds 4.5mm, and the thicker the thickness, the more difficult it is to ensure the eccentricity

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