CN212647929U

CN212647929U - Underwater medium-voltage power cable

Info

Publication number: CN212647929U
Application number: CN202021629921.1U
Authority: CN
Inventors: 管永生; 陈景国; 胡天宝; 冯浩楠; 田锐锋; 卢晓阳
Original assignee: Yichang Xintong Cable Co ltd
Current assignee: Yichang Xintong Cable Co ltd
Priority date: 2020-08-07
Filing date: 2020-08-07
Publication date: 2021-03-02
Anticipated expiration: 2030-08-07

Abstract

An underwater medium-voltage power cable comprises a cable core formed by cabling of a plurality of waterproof insulating cable cores, wherein each waterproof insulating cable core comprises a conductor, each conductor is a conductor formed by twisted single wires, water-blocking factice is filled between gaps of the single wires, and a semi-conductive water-blocking tape wrapping layer, a conductor shielding layer, an insulating shielding layer and a waterproof layer are sequentially arranged outside the conductor from inside to outside; a water-blocking buffer belt is wound outside the waterproof insulating wire cores to form a cable, and filling ropes are filled in gaps among the waterproof insulating wire cores; the cable core is sequentially provided with a metal sheath, an inner sheath, an armor layer, an outer sheath and a mothproof layer from inside to outside. The utility model provides an underwater medium voltage power cable can solve the problem that waterproof performance is not enough, easily destroyed, has excellent waterproof performance, and prevents fish, protection against insects, prevents pounding, pollution-free, corrosion-resistant.

Description

Underwater medium-voltage power cable

Technical Field

The utility model belongs to the technical field of the underwater cable technique and specifically relates to an underwater medium voltage power cable.

Background

In recent years, with the mass construction of facilities for lakes and rivers, the need for burying power cables near shallow water has increased. Inland lakes and internal rivers in China are numerous, and the inland lakes and the internal rivers cannot completely bypass the actual laying process, if all the inland lakes and the internal rivers adopt an overhead mode, the cost is extremely high, and a relatively economic mode of laying power cables in water is usually adopted.

However, since there is no relevant standard, the current power cable laid in a shallow water area (within 20 meters underwater) has the defects of insufficient waterproof performance, easy bite by fishes and shrimps and the like or water inflow of conductors caused by paddle or other hard objects.

Disclosure of Invention

The utility model aims to solve the technical problem that a medium voltage power cable under water is provided, can solve the problem that waterproof performance is not enough, easily destroyed, has excellent waterproof performance, and prevents fish, protection against insects, prevents pounding, pollution-free, corrosion-resistant.

In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: an underwater medium-voltage power cable comprises a cable core formed by cabling of a plurality of waterproof insulating cable cores, wherein each waterproof insulating cable core comprises a conductor, each conductor is a conductor formed by twisted single wires, water-blocking factice is filled between gaps of the single wires, and a semi-conductive water-blocking tape wrapping layer, a conductor shielding layer, an insulating shielding layer and a waterproof layer are sequentially arranged outside the conductor from inside to outside;

a water-blocking buffer belt is wound outside the waterproof insulating wire cores to form a cable, and filling ropes are filled in gaps among the waterproof insulating wire cores;

the cable core is sequentially provided with a metal sheath, an inner sheath, an armor layer, an outer sheath and a mothproof layer from inside to outside.

The waterproof layer consists of a semi-conductive water-blocking tape and a copper strip wrapped on the outer surface of the semi-conductive water-blocking tape.

The overlapping degree of the semi-conductive water-blocking tape is 50%, and the overlapping degree of the copper strip is 15%.

The filling rope is a PP filling rope.

The metal sheath is a corrugated aluminum sheath.

The armor layer is a galvanized steel wire armor layer.

The underwater medium-voltage power cable provided by the utility model achieves the purpose of horizontal water resistance through the water-blocking factice filled between the gaps of each single wire and the winding layer of the semi-conductive water-blocking tape wrapped outside the conductor, so that the water-blocking performance is more excellent; the conductor has no external water molecules, is not easy to oxidize, is insulated from water trees, prolongs the service life of the cable, and ensures the normal operation of a power grid. The waterproof layer which is arranged outside the insulating layer and consists of the semiconductive waterproofing tape and the copper strip, and the waterproof buffer tape, the metal sheath, the armor layer and the like are designed, so that the waterproof performance is further enhanced; novel structure, high strength, good flexibility, large current-carrying capacity, excellent waterproof performance, fish prevention, insect prevention, smashing prevention, no pollution and excellent corrosion resistance. Easy heat dissipation, low loss and good ageing resistance, and can be widely used in shallow water areas (lakes, rivers and the like) within 20 meters underwater.

Drawings

The invention will be further explained with reference to the following figures and examples:

fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

As shown in fig. 1, an underwater medium-voltage power cable comprises a cable core formed by cabling three waterproof insulated wire cores, wherein each waterproof insulated wire core comprises a conductor 1, each conductor 1 is a conductor formed by twisted single wires, water-blocking factice is filled between gaps of the single wires, and a semi-conductive water-blocking tape wrapping layer, a conductor shielding layer 2, an insulating layer 3, an insulating shielding layer 4 and a waterproof layer are sequentially arranged outside the conductor 1 from inside to outside;

a water-blocking buffer belt 8 is wound outside the waterproof insulated wire cores to form a cable, and filling ropes 7 are filled in gaps among the waterproof insulated wire cores; the water-blocking buffer belt 8 plays a role in further water prevention and cabling forming, and the cable core is protected from being damaged by the binding grains of the metal sheath.

The cable core is sequentially provided with a metal sheath 9, an inner sheath 10, an armor layer 11, an outer sheath 12 and a mothproof layer from inside to outside.

The waterproof layer consists of a semi-conductive water-blocking tape 5 and a copper strip 6 wrapped on the outer surface of the semi-conductive water-blocking tape 5.

The overlapping degree of the semiconductive water-blocking tape 5 is 50%, and the overlapping degree of the copper tape 6 is 15%.

The filling rope 7 is a PP filling rope.

The metal sheath 9 is a corrugated aluminum sheath, which has the effects of protecting the cable core, improving the strength and water resistance, and simultaneously, the bending performance is improved by the binding.

The inner sheath 10 and the outer sheath 12 are preferably high density polyethylene sheaths that provide water resistance.

The armor layer 11 is a galvanized steel wire armor layer, and can increase the strength of the cable core and play a role in protecting the cable core.

The utility model discloses a preparation main points are as follows:

1. conductor

The conductor is formed by drawing a single copper rod, and the surface of the conductor is guaranteed to be smooth, free of oil stain and free of damage and insulating burrs and sharp edges.

2. Stranded wire

The copper rods are stranded according to a certain direction and pitch in a layering mode, water-blocking ointment is filled in the copper rods, the semi-conductive water-blocking tape is wrapped, wrapping bands are wrapped smoothly, and the phenomena of bag loosening, bag breaking, bag leakage, folding, oil leakage and the like cannot occur.

3. Insulation

The insulation adopts a three-layer co-extrusion structure, and the conductor shielding layer 2, the insulating layer 3 and the insulation shielding layer 4 are simultaneously extruded and tightly coated to form an integral structure. Then the crosslinking process is finished by heating and pressurizing through a vulcanization pipe.

The average value of the coating thickness should not be less than the nominal value, the thickness of the thinnest point should not be less than 90% of the nominal thickness, and the eccentricity should not be more than 10%. The surface of the extruded bag should be smooth and free of sharp corners, particles, scorching, scratching and the like. The extrusion was followed by degassing in air for one day.

4. Wrapped shield

And respectively winding a layer of semi-conductive water-blocking tape 5 with the overlapping degree of 50% and a layer of copper tape 6 with the overlapping degree of 15% on the surface of the cable core from inside to outside to serve as a last barrier of waterproof performance.

The wrapping is smooth and has no quality defects such as folds, hems, damages and the like.

5. Cabling method

The three insulated cable cores are cabled according to a certain pitch, and are wrapped by 15% -20% of a water-blocking buffer tape after being filled with a PP filling rope. The cable is round, and the wrapping tape is smooth and smooth without phenomena of loose wrapping, broken wrapping, leakage wrapping, wrinkling and the like.

6. Metal sheath

The metal sheath 9 adopts an aluminum strip welding and binding structure, the aluminum strip is finely cut and then welded on the surface of the cable core to form a tubular structure, and then the tubular structure is corrugated through binding so as to be convenient for bending. The welding seam is continuous and does not leak.

7. Inner sheath 10

The average value of the extruded thickness should not be less than the nominal value, and the thickness of the thinnest point should not be less than 90% of the nominal thickness. The surface of the extruded bag should be smooth and free of sharp corners, particles, scorching, scratching and the like.

8. Armor

The galvanized steel wires are lapped and wound, and the armor layer 11 is formed in the left direction. The steel wire is wrapped and attached to the clothes, and the quality phenomena of wire leakage, bag loosening, bulging and the like cannot occur.

9. Outer sheath

The above embodiments are merely preferred technical solutions of the present invention, and should not be considered as limitations of the present invention, and the features in the embodiments and the examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention shall be defined by the claims and the technical solutions described in the claims, including the technical features of the equivalent alternatives as the protection scope. Namely, equivalent alterations and modifications within the scope of the invention are also within the scope of the invention.

Claims

1. The utility model provides an underwater medium voltage power cable, includes the cable core that is cabled formation by many waterproof insulation sinle silks, its characterized in that: the waterproof insulation wire core comprises a conductor (1), the conductor (1) is a conductor formed by stranded single wires, water-blocking factice is filled between gaps of the single wires, and a semi-conductive water-blocking tape wrapping layer, a conductor shielding layer (2), an insulation layer (3), an insulation shielding layer (4) and a waterproof layer are sequentially arranged outside the conductor (1) from inside to outside;

a water-blocking buffer belt (8) is wound outside the waterproof insulating wire cores to form a cable, and filling ropes (7) are filled in gaps among the waterproof insulating wire cores;

the cable core is sequentially provided with a metal sheath (9), an inner sheath (10), an armor layer (11), an outer sheath (12) and a mothproof layer from inside to outside.

2. Underwater medium voltage power cable according to claim 1, characterized in that: the waterproof layer consists of a semi-conductive water-blocking tape (5) and a copper strip (6) wrapped on the outer surface of the semi-conductive water-blocking tape (5).

3. Underwater medium voltage power cable according to claim 2, characterized in that: the overlapping degree of the semi-conductive water-blocking tape (5) is 50 percent, and the overlapping degree of the copper strip (6) is 15 percent.

4. Underwater medium voltage power cable according to claim 1, characterized in that: the filling rope (7) is a PP filling rope.

5. Underwater medium voltage power cable according to claim 1, characterized in that: the metal sheath (9) is a corrugated aluminum sheath.

6. Underwater medium voltage power cable according to claim 1, characterized in that: the armor layer (11) is a galvanized steel wire armor layer.