Single-stage-transmission direct-current submarine cable

Abstract

The invention discloses a single-stage-transmission direct-current submarine cable. The single-stage-transmission direct-current submarine cable is composed of a direct-current submarine cable body, at least one optical cable unit and a ground wire, wherein the direct-current submarine cable body, the optical cable unit and the ground wire are sequentially intertwisted into a whole. The direct-current submarine cable body is sequentially composed of a first waterproof conductor, a first inner shielding layer, a first insulating layer, a first outer shielding layer, a longitudinal waterproof layer, a first metal sleeve, a first semi-conducting layer, a first armor layer and a first outer coating layer. The ground wire is sequentially composed of a second waterproof conductor, a second inner shielding layer, a second insulating layer, a second outer shielding layer, a waterproof layer, a second armor layer and a second outer coating layer. The optical cable unit is sequentially composed of an optical fiber, a stainless steel tube unit, an inner armor layer, an inner sheath, an outer armor layer and a third outer coating layer. In this way, the single-stage-transmission direct-current submarine cable does not generate electromagnetic induction and is free of damage to the ecological environment. By the adoption of the single-stage-transmission direct-current submarine cable, normal operation of people in a submarine cable laying area can be effectively guaranteed, and electric shock conditions are avoided, and communication signals can be transmitted.

Description

technical field [0001] The invention relates to the field of power cables, in particular to a single-stage transmission DC submarine cable. Background technique [0002] Submarine power cables are one of the most important equipment in submarine power transmission projects. Submarine power cables span straits and rivers and connect international and domestic regional power grids. The currently used submarine cables are mainly based on AC transmission. Due to the large transmission loss, complicated compensation technology, and the use of three-wire and four-wire system, it has great limitations in the face of large-span submarine cable projects, and the economic cost is relatively high. . The DC submarine cable has low transmission loss, no compensation, and positive and negative transmission, which is more suitable for ultra-long-distance power transmission, and the economic cost is relatively low. The development of DC submarine cables and the development of DC transmis...

AI Technical Summary

Problems solved by technology

[0005] 2. There is no optical cable unit, only power signal can be transmitted

If it is necessary to transmit communication signals, another submarine optical cable needs to be laid. In addition to additional cable and laying costs, it will also occupy valuable ocean routes.

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