CN117542567A - Submarine cable - Google Patents

Abstract

The application provides a submarine cable relates to cable equipment technical field, including outer protection layer group to and set up filler strip, three cable and reserve cable in outer protection layer group. The filler strip has three recess and a mounting hole that extend along its length extending direction, and three recess is seted up in the lateral wall of filler strip, and three recess is around the lateral wall interval and evenly distributed of filler strip, and every recess is used for holding a cable, and the mounting hole is seted up in the core of filler strip, and the periphery side of mounting hole is located around to three recess, and the mounting hole is used for holding reserve cable to can make three cable be three-phase symmetric distribution, can offset the magnetic field of three cable when transmitting three-phase alternating current, thereby reduce the loss of submarine cable transmission electric energy in-process.

Description

Submarine cable

Technical Field

The application relates to the technical field of cable equipment, in particular to a submarine cable.

Background

With the transmission of long-distance electric energy and optical signals, submarine cables are widely used. Subsea cables can typically include a plurality of cables and a multilayer protective layer coating the exterior of the cables.

The cable that is used for transmitting electric energy in general in submarine cable has four, and one of them is reserve cable, and four cables are the form of transposition each other generally to increase the compactness between each cable, later can wrap the inoxidizing coating at the periphery side of intertwisted cable each other, and in order to improve the rounding degree when wrapping the inoxidizing coating, need add the filling unit in the clearance between adjacent cable, improve the bulk strength of submarine cable when guaranteeing the rounding degree.

However, when the submarine cable of the related art described above operates and transmits electric power, the cables in the operating state generate magnetic fields with each other, thereby causing an increase in loss of the cables.

Disclosure of Invention

The embodiment of the application provides a submarine cable, which is used for solving the technical problem that when the submarine cable in the related technology works and transmits electric energy, the cables in the working state can generate magnetic fields, so that the loss of the cables is increased.

In order to achieve the above purpose, the embodiment of the present application provides the following technical solutions:

the embodiment of the application provides a submarine cable, which comprises an outer protective layer group, and a filling strip, three cables and a standby cable which are arranged in the outer protective layer group;

the filling strip is provided with three grooves and a mounting hole, wherein the three grooves extend along the length extension direction of the filling strip, the three grooves are formed in the outer side wall of the filling strip, the three grooves are uniformly distributed at intervals around the outer side wall of the filling strip, and each groove is used for accommodating one cable;

the mounting hole is formed in the core of the filler strip, the three grooves are formed in the outer peripheral side of the mounting hole in a winding mode, and the mounting hole is used for accommodating the standby cable.

On the basis of the technical scheme, the application can be further improved as follows.

In one possible implementation, the distance between the opposite side walls of the recess remains constant along the depth direction of the recess.

In one possible implementation, the bottom of the groove is an arc-shaped structure, the concave side of the arc-shaped structure faces the notch of the groove, and the part of the cable is located in the arc-shaped structure.

In one possible embodiment, three of the grooves extend helically along the length of the filler strip on the outer circumferential side of the filler strip.

In one possible implementation manner, the filling strip is provided with a plurality of through holes, and the through holes are distributed at intervals along the length extension direction of the filling strip;

the through holes extend along the radial direction of the filling strips, the through holes are communicated with the outside of the filling strips and the mounting holes on the filling strips, and the through holes are used for guiding seawater permeated through the outer protective layer group to enter the mounting holes.

In one possible implementation, the difference between the depth of the groove and the outer diameter of the cable is greater than or equal to 1mm and less than or equal to 3mm;

and/or a difference between the width of the groove and the outer diameter of the cable is greater than or equal to 1mm and less than or equal to 3mm;

and/or the distance from the bottom of the groove to the inner side wall of the mounting hole is more than or equal to 5mm and less than or equal to 8mm;

and/or the ratio of the distance from the outer edge of the filler strip to the inner side wall of the mounting hole to the outer diameter of the cable is greater than or equal to 1 and less than or equal to 1.2;

and/or the ratio of the inner diameter of the mounting hole to the outer diameter of the spare cable is greater than or equal to 1.1.

In one possible implementation, the outer jacket assembly includes a tape layer, an inner cushion layer, an armor layer, and an outer jacket layer;

the packing strip comprises a packing strip, an inner cushion layer, an armor layer, an outer cover layer and an armor layer, wherein the packing strip is arranged on the outer side of the packing strip, the inner cushion layer is arranged on the outer side of the packing strip, the armor layer is arranged on the outer side of the inner cushion layer, and the armor layer is arranged on the outer side of the outer cover layer.

In one possible implementation, the armor layer includes a plurality of wires and a plurality of fiber optic cables stranded with one another;

the plurality of metal wires are uniformly distributed at intervals along the outer peripheral side of the inner cushion layer, and the optical cable is arranged at intervals between two adjacent metal wires.

In one possible implementation, the wire includes a wire and a buffer layer that wraps around the wire such that the cable is in contact with the wire through the buffer layer.

In one possible implementation, the fiber optic cable includes an optical fiber, a metal layer, and a conductive layer;

the metal layer is arranged on the outer side of the optical fiber, and the conductive layer is arranged on the outer side of the metal layer.

The embodiment of the application provides a submarine cable, which comprises an outer protective layer group, and a filling strip, three cables and a standby cable which are arranged in the outer protective layer group. The filler strip has three recess and a mounting hole that extend along its length extending direction, and three recess is seted up in the lateral wall of filler strip, and three recess is around the lateral wall interval and evenly distributed of filler strip, and every recess is used for holding a cable, and the mounting hole is seted up in the core of filler strip, and the periphery side of mounting hole is located around to three recess, and the mounting hole is used for holding reserve cable to can make three cable be three-phase symmetric distribution, can offset the magnetic field of three cable when transmitting three-phase alternating current, thereby reduce the loss of submarine cable transmission electric energy in-process.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief description will be given below of the drawings that are needed in the embodiments or the prior art descriptions, and it is obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic cross-sectional view of a subsea cable provided by an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of a filler strip provided in an embodiment of the present application;

FIG. 3 is a schematic cross-sectional view of another filler strip provided in an embodiment of the present application;

FIG. 4 is a schematic cross-sectional view of a metal wire provided in an embodiment of the present application;

fig. 5 is a schematic cross-sectional view of an optical cable according to an embodiment of the present application.

Reference numerals illustrate:

100-an outer protective layer group;

110-a tape layer; 120-an inner cushion layer; 130-armor; 140-an outer coating;

131-metal lines; 132-optical cable;

1311-wire; 1312-a buffer layer; 1321-optical fiber; 1322-metal layer;

1323-conductive layer;

200-filling strips;

210-groove; 220-mounting holes; 230-a through hole;

211-sidewalls; 212-groove bottom; 213-notch;

300-cable;

400-spare cable.

Detailed Description

As described in the background art, when the submarine cable of the prior art operates and transmits electric power, the cables in the operating state generate magnetic fields with each other, thereby causing an increase in loss of the cables. The reason for this problem is that there are typically three cables for transmitting three-phase alternating current and one spare cable for replacement use when one of the three cables is damaged in the submarine cable in the related art. In the prior art, three cables and spare cables are directly twisted and connected, in the section perpendicular to the extending direction of the submarine cable in the twisting mode, the three cables and the spare cables are distributed in four directions, and the three cables cannot be symmetrically distributed in three phases due to the arrangement mode, so that magnetic fields generated among the three cables which are not symmetrically distributed in three phases cannot be counteracted, and the loss of the electric energy in the transmission process is increased.

To above-mentioned technical problem, this application embodiment provides a submarine cable, and it includes outer protective layer group to and set up filler strip, three cable and the reserve cable in outer protective layer group. The filler strip has three recess and a mounting hole that extend along its length extending direction, and three recess is seted up in the lateral wall of filler strip, and three recess is around the lateral wall interval and evenly distributed of filler strip, and every recess is used for holding a cable, and the mounting hole is seted up in the core of filler strip, and the periphery side of mounting hole is located around to three recess, and the mounting hole is used for holding reserve cable to can make three cable be three-phase symmetric distribution, can offset the magnetic field of three cable when transmitting three-phase alternating current, thereby reduce the loss of submarine cable transmission electric energy in-process.

In order to make the above objects, features and advantages of the embodiments of the present application more comprehensible, the following description will make the technical solutions of the embodiments of the present application clear and complete with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, based on the embodiments herein, which are within the scope of the protection of the present application, will be within the purview of one of ordinary skill in the art without the exercise of inventive faculty.

Referring to fig. 1 and 2, embodiments of the present application provide a subsea cable that may include an outer jacket assembly 100, and filler strips 200, three cables 300, and a backup cable 400 disposed within the outer jacket assembly 100. Wherein three cables 300 enable subsea cables to achieve transmission of three-phase alternating current. By providing the spare cable 400, when one of the three cables 300 is damaged and cannot be used, the spare cable can be used as the replacement cable 300, so that the submarine cable can recover the transmission of the three-phase alternating current, and the practicability of the submarine cable is improved.

Referring to fig. 2, in some embodiments, the filler strip 200 may have an approximately circular cross section perpendicular to the extension direction thereof, so that the roundness of the outer jacket assembly 100 when wrapping the filler strip 200, the cable 300, and the spare cable 400 can be ensured, and thus the roundness of the submarine cable can be improved.

Referring to fig. 2, the filler strip 200 has three grooves 210 and one mounting hole 220 extending along a length extension direction thereof, the three grooves 210 are opened at an outer sidewall 211 of the filler strip 200, and the three grooves 210 are spaced and uniformly distributed around the outer sidewall 211 of the filler strip 200, each groove 210 being for receiving one cable 300.

By having three grooves 210 spaced and evenly distributed on the outer sidewall 211 of the filler strip 200, it is possible to make the three grooves 210 symmetrical to each other about the axis of the filler strip 200 in a section perpendicular to the extending direction of the filler strip 200. If the three cables 300 are respectively disposed in the three grooves 210, the three cables 300 can be symmetrically distributed in three phases, and the magnetic fields of the three cables 300 during the transmission of the three-phase alternating current can be counteracted, so that the loss in the process of transmitting the electric energy by the submarine cable is reduced.

Further, by arranging the three grooves 210 at intervals and uniformly distributed on the outer side wall 211 of the filler strip 200, the three grooves 210 can be symmetrical to each other with respect to the axis of the filler strip 200 on a section perpendicular to the extending direction of the filler strip 200, and the three cables 300 can be respectively arranged in the three grooves 210, so that the stability of the three-phase symmetrical distribution form of the three cables 300 can be ensured.

It is understood that the cable 300 may be configured as is common in the art. In one possible implementation, the cable 300 may include a water blocking conductor, a conductor shield, an insulation layer, an insulation shield, a metal shield, and a split-phase jacket layer disposed sequentially from the inside out.

In some embodiments, the filler strip 200 may be made of a medium density polyethylene material containing carbon black material, thereby ensuring good compressive strength and flexibility of the filler strip 200 during twisting. And moreover, electrical continuity can be ensured by adding the carbon black material, and the three-phase metal shield can jointly bear short-circuit current when the semi-conductive split-phase sheath is adopted, so that the operation is safer and more reliable.

The embodiment provides a submarine cable, which comprises an outer sheath group 100, and a filling strip 200, three cables 300 and a standby cable 400 which are arranged in the outer sheath group 100. The three cables 300 are respectively arranged in the three grooves 210 on the filling strip 200, the three grooves 210 are uniformly distributed around the outer side wall 211 of the filling strip 200 at intervals, the three cables 300 can be symmetrically distributed in three phases, and magnetic fields of the three cables 300 during transmission of three-phase alternating current can be counteracted, so that loss in the process of transmitting electric energy by the submarine cable is reduced.

Referring to fig. 2, a mounting hole 220 is opened in the core of the filler strip 200, and three grooves 210 are provided around the outer circumferential side of the mounting hole 220, the mounting hole 220 is coaxially disposed with the filler strip 200, and the mounting hole 220 is for receiving the spare cable 400. By installing the spare cable 400 in the installation hole 220 of the filler strip 200, connection tightness between the filler unit and the spare cable 400 can be improved without affecting three-phase symmetrical distribution of the three cables 300.

In some embodiments, during use of the subsea cable 300, if one of the three cables 300 in the subsea cable is damaged, the damaged cable 300 can be replaced with the spare cable 400, so that transmission of three-phase alternating current of the subsea cable can be restored, and system outage time delayed when the subsea cable is maintained is reduced.

Referring to fig. 1 and 2, in some embodiments, each groove 210 has two opposite sidewalls 211, and the distance between the two sidewalls 211 is constant along the depth direction of the groove 210, i.e., the groove 210 has a vertical structure, and a tangent line of the filler strip 200 at an intersection point of the sidewalls 211 and an outer edge of the filler strip 200 is perpendicular to the sidewalls 211. By providing the side walls 211 of the recess 210 in a vertical configuration, the cable 300 can be easily installed in the recess 210.

Referring to fig. 2, in some embodiments, the difference between the depth of the groove 210 (as shown by depth h in fig. 2) and the outer diameter of the cable 300 is 1mm or more and 3mm or less, for example, the difference between the depth h of the groove 210 and the outer diameter of the cable 300 may be 1.5mm, 1.8mm, 2.1mm, 2.6mm, or 2.8mm. By making the depth h of the groove 210 greater than the outer diameter of the cable 300, the cable 300 can be completely accommodated in the groove 210, so that the cable 300 is prevented from being partially positioned outside the groove 210, and the protection effect on the cable 300 is improved.

In some embodiments, the difference between the width of the groove 210 (as shown by width a in fig. 2) and the outer diameter of the cable 300 is greater than or equal to 1mm and less than or equal to 3mm, for example, the difference between the width a of the groove 210 and the outer diameter of the cable 300 may be 1.7mm, 1.9mm, 2.3mm, 2.5mm, or 2.9mm. By making the width a of the groove 210 larger than the outer diameter of the cable 300, it is possible to facilitate the installation of the cable 300 in the groove 210.

In some embodiments, the distance of the groove bottom 212 of the groove 210 from the inner sidewall 211 of the mounting hole 220 (as indicated by reference numeral b in fig. 2) is 5mm or more and 8mm or less, for example, the distance b of the groove bottom 212 of the groove 210 from the inner sidewall 211 of the mounting hole 220 may be 5.5mm, 5.8mm, 6.7mm, 7.3mm, or 7.8mm. By making the distance b from the groove bottom 212 of the groove 210 to the inner side wall 211 of the mounting hole 220 greater than 5mm, it is possible to avoid that the distance between the groove 210 and the mounting hole 220 is too small to affect the overall strength of the filler strip 200.

In some embodiments, the ratio of the distance of the outer edge of the filler strip 200 to the inner sidewall 211 of the mounting hole 220 to the outer diameter of the cable 300 is greater than or equal to 1 and less than or equal to 1.2, e.g., the ratio of the distance of the outer edge of the filler strip 200 to the inner sidewall 211 of the mounting hole 220 (as shown by reference numeral c in fig. 2) to the outer diameter of the cable 300 may be 1 or 1.2.

In some embodiments, the ratio of the inner diameter of the mounting hole 220 to the outer diameter of the backup cable 400 is 1.1 or more.

Referring to fig. 2, in some embodiments, the groove bottom 212 of the groove 210 is an arcuate structure with the concave side of the arcuate structure facing the notch 213 of the groove 210 and a portion of the cable 300 is located within the arcuate structure. By setting the groove bottom 212 of the groove 210 to an arc-shaped structure, the contact area of the groove bottom 212 and the cable 300 can be increased, and the installation stability of the cable 300 in the groove 210 can be improved, thereby improving the connection stability between the filler strip 200 and the cable 300.

In one possible implementation, the groove bottom 212 of the groove 210 may be a semicircular arc structure, and the concave side of the semicircular arc structure is a semicircular arc, and the diameter of the semicircular arc can be approximately equal to the outer diameter of the cable 300, so that the contact area between the cable 300 and the mounting groove can be further increased, the mounting stability of the cable 300 in the groove 210 can be improved, and the connection stability between the filler strip 200 and the cable 300 can be further improved.

In some embodiments, three grooves 210 extend helically along the length of the filler strip 200 on the outer peripheral side of the filler strip 200. By spirally extending the three grooves 210 on the outer circumferential side of the filler strip 200 in the axial direction of the filler strip 200, the connection tightness between the three cables 300 and the grooves 210 can be improved, the probability of relative displacement of the cables 300 relative to the grooves 210 in the extending direction thereof is further reduced, the connection tightness between the cables 300 and the filler strip 200 is improved, and the structural stability of the submarine cable is further improved.

Referring to fig. 3, in some embodiments, the filling bar 200 is provided with a plurality of through holes 230, and the plurality of through holes 230 are arranged at intervals along the length extension direction of the filling bar 200. The through holes 230 extend in the radial direction of the filler rod 200, the through holes 230 communicate the outside of the filler rod 200 with the mounting holes 220 on the filler rod 200, and the through holes 230 serve to guide seawater permeated through the outer jacket assembly 100 into the mounting holes 220.

In the operation process of the cable 300, a large amount of heat is generated, the heat generated by the cable 300 is transferred to the filler strip 200, and the filler strip 200 is provided with a plurality of through holes 230, so that the mounting holes 220 can be communicated with the outer surface of the filler strip 200 through the through holes 230, and when the submarine cable is arranged in seawater, the seawater can enter the mounting holes 220 of the core part of the filler strip 200 through the through holes 230 after penetrating into the outer protective layer group, and the heat dissipation effect of the cable 300 can be improved. Further, by providing the through holes 230, the water pressure inside and outside the submarine cable can be balanced, and the pressure applied to the filler rod 200 can be effectively reduced.

Referring to fig. 3, in some embodiments, the through holes 230 can be provided on the filler strip 200 between adjacent two of the grooves 210, with the through holes 230 extending in the radial direction of the filler strip 200.

Referring to fig. 1, in some embodiments, outer jacket assembly 100 may include a tape layer 110, an inner pad layer 120, an armor layer 130, and an outer jacket layer 140, tape layer 110 being disposed outside of filler strip 200, inner pad layer 120 being disposed outside of tape layer 110, armor layer 130 being disposed outside of inner pad layer 120, outer jacket layer 140 being disposed outside of armor layer 130.

The tight connection between the cable 300 and the filler strip 200 can be further improved by providing the tape layer 110, and the cable 300 is prevented from coming out of the groove 210 of the filler strip 200. In some embodiments, the tape layer 110 can have multiple layers. The band layer 110 may be a high strength nylon tape.

By providing the inner mat 120, the cable 300 and the filler strip 200 can be prevented from directly receiving the pressure applied by the armor 130, and the probability of damage to the filler strip 200 and the cable 300 due to excessive pressure of the armor 130 can be reduced. In some embodiments, the inner mat 120 may be formed from polypropylene fiber strands.

By providing the armor 130, the performance of the cable 300 and the filler strip 200 against external impact can be improved, and the probability of damage to the cable 300 and the filler strip 200 due to external impact can be reduced.

By providing the outer cover 140, direct contact between the armor 130 and objects in the external environment can be avoided, wear of the armor 130 can be reduced, and the service life of the submarine cable can be improved. In some embodiments, outer jacket 140 may be wrapped directly around the outer surface of armor 130 using double-layer polypropylene fiber rope to enhance the abrasion resistance of the subsea cable.

Referring to fig. 1, in some embodiments, the armor layer 130 may include a plurality of wires 131 twisted with each other and a plurality of optical cables 132, the plurality of wires 131 being spaced apart and uniformly arranged along the outer circumferential side of the inner pad layer 120, the optical cables 132 being disposed at intervals between adjacent two of the wires 131, thereby enabling the plurality of optical cables 132 to be wound around the outer circumferential side of the inner pad layer 120.

The submarine cable in the prior art is characterized in that an optical cable is arranged in a gap between two adjacent cables, the submarine cable is nearer to the cables, and the influence of induced voltage generated during the operation of the cables on the optical cable is larger. And the submarine cable of this application is through mutually hank optical cable 132 and metal wire 131 and form armor 130, can make optical cable 132 keep away from cable 300 in the outer protective layer group to can reduce the influence of the induced voltage that cable 300 produced at the in-process of transmission electric energy to optical cable 132, improve the stability when optical cable 132 transmits the optical signal.

Further, by providing the plurality of optical cables 132 on the outer peripheral side of the inner mat 120, the plurality of optical cables 132 can be provided in a surrounding manner. If the cable 300 is damaged due to external impact on the submarine cable, the optical cable 132 corresponding to the damaged portion of the cable 300 is damaged, and the damaged portion of the optical cable 132 can be detected by using an optical time-domain reflectometer (OTDR) (optical time-domain reflectometer), so that the damaged portion of the cable 300 is indirectly detected, and the detection accuracy of the damaged portion of the cable 300 is improved.

In addition, by providing the plurality of optical cables 132 on the outer circumferential side of the inner mat 120, when some of the optical cables 132 are damaged, optical signal transmission can be performed through the plurality of undamaged optical cables 132 on the outer circumferential side, so that the influence of damage of the optical cables 132 on the optical signal transmission of the submarine cable is reduced, and the practicability of the submarine cable is improved.

Referring to fig. 4, in some embodiments, the wire 131 may include a wire 1311 and a buffer layer 1312, the buffer layer 1312 being wrapped around the outside of the wire 1311 such that the fiber optic cable 132 is in contact with the wire 1311 through the buffer layer 1312. By providing the buffer layer 1312 on the outer side of the wire 1311, the wire 1311 can be prevented from directly contacting the optical cable 132, and the pressing force of the wire 1311 applied to the optical cable 132 can be reduced while ensuring the strength of the armor 130.

In particular implementations, the buffer layer 1312 may be a high density polyethylene disposed outside of the wire 1311 by an extrusion process. The wire 1311 may be a galvanized wire 1311, and the material of the wire 1311 may be a magnetic material or a non-magnetic material.

Referring to fig. 5, in some embodiments, fiber optic cable 132 may include optical fiber 1321, metal layer 1322, and conductive layer 1323, metal layer 1322 being disposed outside of optical fiber 1321, conductive layer 1323 being disposed outside of metal layer 1322. By providing the metal layer 1322 on the outside of the optical fiber 1321, the performance of the optical fiber 1321 against external compression and impact can be reduced, and the service life of the optical fiber 1321 can be improved. Further, by providing the metal layer 1322 on the outer side of the optical fiber 1321, the induced voltage generated when the cable 300 is operated can be guided to the sea water by the metal layer 1322, so that the influence of the induced voltage on the optical signal transmission of the optical fiber 1321 is reduced, and the operation stability of the optical fiber 1321 when transmitting the optical signal is improved.

In some embodiments, the number of optical fibers 1321 within each fiber optic cable 132 is less than or equal to 3, for example, the number of optical fibers 1321 within each fiber optic cable 132 may be 1 or 2. The metal layer 1322 may be a stainless steel tube.

The conductive layer 1323 is disposed on the outer side of the metal layer 1322, so that induced voltage can be further guided into seawater, thereby further reducing the influence of the induced voltage on optical signal transmission, and further improving the working stability of the optical fiber 1321 when transmitting optical signals. In some embodiments, the conductive layer 1323 may be made from a semiconductive medium density polyethylene material.

In this specification, each embodiment or implementation is described in a progressive manner, and each embodiment focuses on a difference from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

It should be noted that references in the specification to "in the detailed description", "in some embodiments", "in this embodiment", "exemplarily", etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

Generally, terms should be understood at least in part by use in the context. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, at least in part depending on the context. Similarly, terms such as "a" or "an" may also be understood to convey a singular usage or a plural usage, depending at least in part on the context.

It should be readily understood that the terms "on … …", "above … …" and "above … …" in this disclosure should be interpreted in the broadest sense such that "on … …" means not only "directly on something", but also includes "on something" with intermediate features or layers therebetween, and "above … …" or "above … …" includes not only the meaning "on something" or "above" but also the meaning "above something" or "above" without intermediate features or layers therebetween (i.e., directly on something).

Further, spatially relative terms, such as "below," "beneath," "above," "over," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein interpreted accordingly.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. The submarine cable is characterized by comprising an outer protective layer group, and filling strips, three cables and a standby cable which are arranged in the outer protective layer group;

the filling strip is provided with three grooves and a mounting hole, wherein the three grooves extend along the length extension direction of the filling strip, the three grooves are formed in the outer side wall of the filling strip, the three grooves are uniformly distributed at intervals around the outer side wall of the filling strip, and each groove is used for accommodating one cable;

the mounting hole is formed in the core of the filler strip, the three grooves are formed in the outer peripheral side of the mounting hole in a winding mode, and the mounting hole is used for accommodating the standby cable.

2. Subsea cable according to claim 1, characterized in that the distance between the opposite side walls of the groove is kept constant in the depth direction of the groove.

3. The subsea cable of claim 2, characterized in that the bottom of the groove is an arcuate structure with the concave side of the arcuate structure facing the mouth of the groove, and the portion of the cable is located within the arcuate structure.

4. A subsea cable according to claim 3, wherein three of the grooves extend helically along the length of the filler strip on the peripheral side of the filler strip.

5. The submarine cable according to claim 4, wherein a plurality of through holes are formed in the filler strip, and the through holes are arranged at intervals along the length extension direction of the filler strip;

the through holes extend along the radial direction of the filling strips, the through holes are communicated with the outside of the filling strips and the mounting holes on the filling strips, and the through holes are used for guiding seawater permeated through the outer protective layer group to enter the mounting holes.

6. The submarine cable according to claim 5, wherein a difference between a depth of the groove and an outer diameter of the cable is 1mm or more and 3mm or less;

and/or a difference between the width of the groove and the outer diameter of the cable is greater than or equal to 1mm and less than or equal to 3mm;

and/or the distance from the bottom of the groove to the inner side wall of the mounting hole is more than or equal to 5mm and less than or equal to 8mm;

and/or the ratio of the distance from the outer edge of the filler strip to the inner side wall of the mounting hole to the outer diameter of the cable is greater than or equal to 1 and less than or equal to 1.2;

and/or the ratio of the inner diameter of the mounting hole to the outer diameter of the spare cable is greater than or equal to 1.1.

7. The subsea cable of any of claims 1-6, characterized in that the outer jacket layer comprises a tape layer, an inner bedding layer, an armor layer, and an outer jacket layer;

the packing strip comprises a packing strip, an inner cushion layer, an armor layer, an outer cover layer and an armor layer, wherein the packing strip is arranged on the outer side of the packing strip, the inner cushion layer is arranged on the outer side of the packing strip, the armor layer is arranged on the outer side of the inner cushion layer, and the armor layer is arranged on the outer side of the outer cover layer.

8. The subsea cable of claim 7, characterized in that the armor layer comprises a plurality of wires and a plurality of fiber optic cables stranded with one another;

the plurality of metal wires are uniformly distributed at intervals along the outer peripheral side of the inner cushion layer, and the optical cable is arranged at intervals between two adjacent metal wires.

9. The submarine cable according to claim 8, wherein the metal wire comprises a metal wire and a buffer layer that is wrapped around the outside of the metal wire such that the optical cable is in contact with the metal wire through the buffer layer.

10. The subsea cable of claim 9, characterized in that the fiber optic cable comprises optical fibers, a metal layer and a conductive layer;

the metal layer is arranged on the outer side of the optical fiber, and the conductive layer is arranged on the outer side of the metal layer.