CN210349422U

CN210349422U - High-pressure submarine cable long-distance landing structure

Info

Publication number: CN210349422U
Application number: CN201920925350.7U
Authority: CN
Inventors: 李春梅; 王克; 杨建军; 潘文林; 郦洪柯; 管晨晓; 邱华
Original assignee: Hengtong Submarine Power Cable Co Ltd
Current assignee: Hengtong Submarine Power Cable Co Ltd
Priority date: 2019-06-19
Filing date: 2019-06-19
Publication date: 2020-04-17
Anticipated expiration: 2029-06-19

Abstract

The utility model discloses a high-voltage submarine cable long-distance landing structure, which is integrated with a submarine cable section and comprises three-phase insulating wire cores, wherein the periphery of each phase of insulating wire core is sequentially coated with a semiconductive water-blocking tape and lead alloy; after the three-phase insulated wire cores are twisted, the three-phase insulated wire cores are bound into a cable through cabling, and an inner liner, a metal armor layer and an outer tegument layer are sequentially coated on the periphery of the cabling binding belt; the cabling binding belt is a semi-conductive binding belt; a brass strip is arranged between the cabling binding belt and the inner liner; the brass band and the metal armor layer are short-circuited through conducting layers arranged at intervals. The equipotential can be formed between the insulated wire core and the metal wire armor layer in dry and humid environments, so that the stability, safety and reliability of the high-voltage submarine cable in long-term operation in complex environments are effectively improved; with the integrative structural design of submarine cable section, avoided adopting intermediate head to change the high risk that submarine cable structural style relogin brought, improved the fail safe nature of high-pressure submarine cable operation.

Description

High-pressure submarine cable long-distance landing structure

Technical Field

The utility model relates to a high-pressure submarine cable field especially relates to a high-pressure submarine cable long distance lands structure.

Background

Due to the characteristics of longer coastline, high offshore wind speed, stable wind power resources, less interference factors and the like in China, equipment and installation cost is reduced and supporting industries are mature day by day along with the increase of offshore wind power supporting strength, and the offshore wind power is developed at an accelerated speed in recent years in China.

At present, a built and under-built offshore wind farm power transmission and transformation system in China mostly adopts a two-stage boosting mode, namely, electric energy generated by a fan is boosted to 35kV through a set boosting device, then is boosted to 220kV through a main transformer of a boosting station, is sent out through a 220kV three-core submarine cable, and mostly adopts a form that the submarine cable directly logs in (high risk generated by an intermediate joint is avoided). Due to the change of marine geology, the oceans are locally landified, so that the route of an entry section is long, the soil of the entry section is usually between dry and wet frequently, and the entry environment is complex and various. When the soil is dry, a potential difference exists between the single-phase submarine cable lead sleeve with the semi-conductive sheath structure and the armor, and the potential difference is increased along with the increase of the laying distance to cause the local discharge phenomenon, so that the submarine cable is locally overheated. The long-term operation of the submarine cable in the complex environment will affect the safe and reliable operation of the line.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the main technical problem who solves provides a high-pressure submarine cable long distance lands structure, can solve because of landing the problem that the potential difference appears between submarine cable sinle silk that the environmental change leads to and the armor.

In order to solve the technical problem, the utility model discloses a technical scheme be: the long-distance landing structure of the high-voltage submarine cable is provided, the landing structure and the submarine cable section are of an integral structure and comprise three-phase insulating wire cores, and the periphery of each phase of the insulating wire core is sequentially coated with a semi-conductive water-blocking tape and lead alloy; the three phases of the insulated wire cores are stranded and then bound into a cable through cabling, and an inner lining layer, a metal armor layer and an outer tegument layer are sequentially coated on the periphery of the cabling binding belt; wherein the cabled ligature is a semiconductive ligature; a brass band is arranged between the cabling binding belt and the inner liner layer; the brass band and the metal armor layer are short-circuited through conducting layers arranged at intervals.

In a preferred embodiment of the present invention, the distance between two adjacent conductive layers is 500-1000 m.

In a preferred embodiment of the present invention, the conductive layer is a copper sheet or a copper wire mesh.

In a preferred embodiment of the present invention, the conductive layer is connected to a ground electrode.

In a preferred embodiment of the present invention, the insulated wire core includes a water-blocking conductor, a conductor shielding layer, a crosslinked polyethylene layer and an insulation shielding layer; wherein the conductor shield layer, the crosslinked polyethylene layer and the insulation shield layer coat the conductor in a three-layer co-extruded form.

In a preferred embodiment of the present invention, the outer periphery of the lead alloy is coated with a semi-conductive sheath.

In a preferred embodiment of the present invention, the inner liner and the outer layer are polypropylene fiber ropes bonded by casting asphalt.

In a preferred embodiment of the present invention, the metal wire armor layer is a galvanized low carbon steel wire.

In a preferred embodiment of the present invention, the semi-conductive binding belt is located at three phases inside the cable core, and a cabling filler is further disposed between the cable cores.

In a preferred embodiment of the present invention, the cabling filler is a polyethylene filler strip.

The utility model has the advantages that: the utility model relates to a high-pressure submarine cable long distance lands structure, through the design of semiconduction water-blocking area, plumbous alloy cover, semiconduction ligature area, brass strips and conducting layer to and the design that conducting layer and wire armor pass through the conducting layer short circuit, make between insulating core and the wire armor all can form the equipotential in dry and humid environment, effectively improved the stability and the safe and reliable performance of high-pressure submarine cable long-term operation under the complicated environment; the utility model discloses with submarine cable section structure as an organic whole, avoided adopting the intermediate head to change the high risk that submarine cable structural style was being brought in logging, improved the fail safe nature of high-pressure submarine cable operation.

Drawings

Fig. 1 is a schematic view of the internal structure of a preferred embodiment of the long-distance landing structure of the high-voltage submarine cable according to the present invention;

FIG. 2 is a schematic diagram of a shorting configuration between the brass strip, wire armor and conductive layer shown;

the parts in the drawings are numbered as follows: 1. the cable comprises a water-blocking conductor, 2 a conductor shielding layer, 3 a crosslinked polyethylene layer, 4 an insulating shielding layer, 5 a semiconductive water-blocking tape, 6 a lead alloy sleeve, 7 a semiconductive sheath, 8 a cabling binding belt, 9 a brass strip, 10 an inner lining layer, 11 a metal armor layer, 12 an outer tegument layer, 13 cabling filling and 14 a conductive layer.

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.

Referring to fig. 1 and 2, an embodiment of the present invention includes:

example 1

The utility model discloses a high-voltage submarine cable long-distance landing structure, which is integrated with a submarine cable section and comprises three-phase cable cores, wherein the periphery of each phase of cable core is sequentially coated with a semi-conductive water-blocking tape 5 and a lead alloy sleeve 6; three-phase through stranding ligature area 8 ligature stranding behind the sinle silk transposition, the periphery of stranding ligature area 8 cladding has brass band 9, inner liner 10, metal armor 11 and tegument 12 in proper order. 8 semi-conductive ligatures in stranding ligature area.

Specifically, each phase core sequentially comprises a water-blocking conductor 1, a conductor shielding layer 2, a cross-linked polyethylene layer 3 and an insulating shielding layer 4 from inside to outside; wherein the conductor shielding layer 2, the crosslinked polyethylene layer 3 and the insulation shielding layer 4 coat the water-blocking conductor 1 in a three-layer co-extrusion manner; the water-blocking conductor 1 is a compacted round conductor twisted by an electrical round copper wire added with a water-blocking layer material (such as a semiconductive water-blocking tape) during twisting.

And the semi-conductive water-blocking tape 5 wraps the insulating wire core to play a role in longitudinally blocking water.

The lead alloy sleeve 6 plays a role in radial water resistance; the periphery of lead alloy cover 6 still the cladding have semiconduction sheath 7, specifically be the semiconduction PE sheath, play the effect of protection lead alloy cover 6 on the one hand, on the other hand, make the landing structure of high pressure submarine cable realize under the moist and watery environment that lead alloy cover 6 and wire armor 11 form the equipotential between to avoid discharging because of the potential difference between submarine cable core and the wire armor.

The lining layer 10 and the outer layer 12 are polypropylene fiber ropes bonded by casting asphalt, and play a role in corrosion protection.

The metal wire armor layer 11 is a galvanized low-carbon steel wire and bears tension required by the submarine cable transportation and laying process.

And cabling fillers 13 are also arranged between the three-phase cable cores on the inner side of the semi-conductive binding belt 8, and the cabling fillers 13 are polyethylene filling strips.

The brass band 9 and the metal armor layer 11 are short-circuited through conducting layers 14 arranged at intervals, and the conducting layers 14 are connected with a grounding electrode. Specifically, the conducting layers 14 are copper sheets or copper wire woven meshes, and the distance between every two adjacent conducting layers 14 is 500-1000 m. Through the design of the semi-conductive water-blocking tape 5, the lead alloy sleeve 6, the semi-conductive sheath 7 and the semi-conductive binding tape 8, the brass strip 9 coated outside the semi-conductive binding tape 8 can be well contacted with the wire core, and the equipotential of the brass strip 9 and the wire core is realized; and then through the short-circuit action of the conducting layer 14, equipotential is formed between the brass strip 9 and the metal wire armor layer 11, so that equipotential is formed between the insulated wire core and the metal wire armor layer 11 in a dry environment, and the problem of discharging caused by potential difference existing between the submarine cable core and the metal wire armor layer when the landing zone dries soil is solved.

In addition, the design of the landing structure avoids the high risk caused by changing the structural form of the submarine cable by adopting an intermediate joint during landing, and improves the safety and reliability of the operation of the high-voltage submarine cable.

The utility model relates to a high pressure submarine cable long distance lands structure, through the design of semi-conductive waterproofing area, lead alloy cover, semi-conductive ligature area, brass band and conducting layer to and the conducting layer passes through the design of conducting layer short circuit with the wire armor, make between insulation core and the wire armor homoenergetic form the equipotential in dry and moist environment, effectively improved high pressure submarine cable long-term operation's under the complex environment stability and safe and reliable performance.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the products of the present invention are usually placed when used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element to which the term refers must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-voltage submarine cable long-distance landing structure is characterized in that the landing structure and a submarine cable section are of an integral structure and comprise three-phase insulating wire cores, and the periphery of each phase of the insulating wire core is sequentially coated with a semiconductive water-blocking tape and lead alloy; after the three phases of the insulated wire cores are stranded, the insulated wire cores are cabled through a cabling binding belt, and an inner lining layer, a metal armor layer and an outer tegument layer are sequentially coated on the periphery of the cabling binding belt; wherein the cabled ligature is a semiconductive ligature; a brass band is arranged between the cabling binding belt and the inner liner layer; the brass band and the metal armor layer are short-circuited through conducting layers arranged at intervals.

2. The high-voltage submarine cable long-distance landing structure according to claim 1, wherein the distance between every two adjacent conductive layers is 500-1000 m.

3. The high-voltage submarine cable long-distance landing structure according to claim 2, wherein the conductive layer is a copper sheet or a woven mesh of copper wires.

4. A high voltage submarine cable long distance landing structure according to claim 2, wherein said conductive layer is connected to a ground electrode.

5. A high-voltage submarine cable long-distance landing structure according to claim 1, wherein said insulated wire core comprises a water-blocking conductor, a conductor shield layer, a crosslinked polyethylene layer, and an insulation shield layer; wherein the conductor shield layer, the crosslinked polyethylene layer and the insulation shield layer coat the conductor in a three-layer co-extruded form.

6. A high-voltage submarine cable long-haul landing structure according to claim 1, wherein said lead alloy is peripherally coated with a semi-conductive jacket.

7. A high pressure submarine cable long distance landing structure according to claim 1, wherein said inner and outer liners are cast-in-place asphalt bonded polypropylene fiber ropes.

8. The high-voltage submarine cable long-distance landing structure according to claim 1, wherein said metal armor layer is galvanized low-carbon steel wire.

9. The high-voltage submarine cable long-distance landing structure according to claim 1, wherein cabling fillers are further arranged between the three-phase insulated wire cores inside the semi-conductive binding tapes.

10. A high pressure submarine cable long-distance landing structure according to claim 9, wherein said cabled filler is a polyethylene filler strip.