CN215770666U - Medium-voltage power cable for urban rail transit power supply looped network - Google Patents

Abstract

The utility model relates to a medium voltage power cable for urban rail transit power supply looped netowrk belongs to the field of cable, and it includes the cable core, the cable core outside is equipped with the metallic shield layer, one side that the cable core was kept away from to the metallic shield layer is equipped with semi-conductive waterproofing area, waterproof layer, armor and restrictive coating in proper order. The protection performance of the cable is improved, and the possibility of damage of the cable is reduced.

Description

Medium-voltage power cable for urban rail transit power supply looped network

Technical Field

The application relates to the field of cables, in particular to a medium-voltage power cable for an urban rail transit power supply looped network.

Background

The urban rail transit is a rapid mass transit which takes electric energy as power and adopts a wheel-rail transportation mode, is the backbone of modern large urban public transit and mainly undertakes the passenger transportation task of short distance in the city. Safe and reliable electric energy supply comes from a medium-voltage power supply ring network, and medium-voltage power cables are selected for construction of power supply ring network lines.

Chinese patent No. CN201374215 discloses a medium voltage cable for a coal mining machine in a mine, which is composed of a control wire core conductor, a shielding layer, an insulating layer, a wrapping layer, a braid layer, a filler core and a rubber sheath, wherein the shielding layer is coated outside the control wire core conductor, the shielding layer comprises an inner shielding layer and an outer shielding layer, and the insulating layer is coated between the inner shielding layer and the outer shielding layer; the control wire core conductor adopts a composite structure, and is stranded into a spiral copper conductor after a wire harness is arranged at the center; the insulating layer, the shielding layer and the three copper conductor cores form a cable core, the wrapping layer covers the outer side of 3 cable cores, gaps of the 3 cable cores are filled by the filling core in an extruding mode, the inner sheath covers the outer side of the wrapping layer, the braided layer covers the outer layer of the inner sheath, and the outer sheath covers the outer side of the braided layer.

In view of the above-mentioned related technologies, the inventor believes that the cable is easily damaged in an environment where the cable is used in a complicated environment, and may be buried deep in soil, laid in the open air, in a tunnel, or soaked in water for a long time and bitten by rats or ants.

SUMMERY OF THE UTILITY MODEL

In order to improve the protection performance of the cable and reduce the possibility of damage of the cable, the application provides a medium-voltage power cable for an urban rail transit power supply looped network.

The application provides a medium voltage power cable for urban rail transit power supply looped netowrk adopts following technical scheme:

the medium-voltage power cable for the urban rail transit power supply ring network comprises a cable core, wherein a metal shielding layer is arranged on the outer side of the cable core, and a semi-conductive water blocking tape, a waterproof layer, an armor layer and a sheath layer are sequentially arranged on one side, away from the cable core, of the metal shielding layer.

By adopting the technical scheme, the outer side of the cable core is provided with the plurality of layers of the protective layers, wherein the metal shielding layer and the armor layer are metal protective layers, the protective capability of the cable is improved, the cable is not easy to damage due to external force or bite of rats and ants, the waterproof layer and the semi-conductive water blocking tape enable the cable to be difficult to damage in water soaking, and therefore the cable also has good protective performance in a complex environment, and the possibility of damage of the cable is reduced.

Optionally, the cable core includes conductor and protective layer that sets gradually from inside to outside, the protective layer includes conductor shielding layer, insulating layer and the insulation shielding layer of being made by crowded dry process crosslinking altogether, and conductor shielding layer, insulating layer and insulation shielding layer keep away from the conductor in proper order.

By adopting the technical scheme, the protective layer is formed by co-extrusion dry-method crosslinking of the conductor shielding layer, the insulating layer and the insulating shielding layer, in the extrusion process, the interfaces at the contact interface of the insulating layer and the conductor shielding layer and the contact interface of the insulating layer and the insulating shielding layer are smooth and clean, the equipotential of the inner surface of the insulating layer is ensured, and the outer surface of the insulating layer is in the equipotential, so that the electric field of the insulating layer is uniformly distributed.

Optionally, the metal shielding layer includes a copper wire wound outside the cable core belt, and a shielding copper belt is reversely wound on one side of the copper wire away from the cable core.

By adopting the technical scheme, the metal shielding layer adopts the copper wire sparse winding and shielding copper strip reverse tightening process, so that the copper wire and the shielding copper strip are tightly wrapped and are not easy to loosen, and meanwhile, the cable core is not easy to damage due to the adoption of the metal material.

Optionally, the semiconductive water-blocking tape is wound on one side, away from the copper wire, of the shielding copper tape, and the winding direction of the semiconductive water-blocking tape is opposite to that of the shielding copper tape.

By adopting the technical scheme, the semi-conductive water-blocking tape reversely winds the shielding copper strip, so that the metal shielding layer is stable, and meanwhile, the function of protecting the metal shielding layer and the function of water-blocking protection are achieved.

Optionally, the waterproof layer is an aluminum-plastic composite belt longitudinally wrapped on the outer side of the semiconductive water blocking belt.

Through adopting above-mentioned technical scheme, the waterproof layer adopts the compound area of aluminium-plastic sealed, prevents inside moisture gets into the cable to play the effect that further prevents the cable from being gnawed.

Optionally, the armor layer is a protective copper strip wound on the outer side of the waterproof layer.

Through adopting above-mentioned technical scheme, the armor adopts the ligature of protection copper strips, makes the cable can resist external force through the protection copper strips, can prevent that the toy from stinging the cable inlayer to make the cable avoid some mechanical damage, reduce impaired possibility.

Optionally, the sheath layer is made of a low-smoke halogen-free material.

By adopting the technical scheme, when a fire disaster happens, the cable sheath made of the low-smoke halogen-free material cannot be easily ignited, and the cable sheath cannot generate a large amount of smoke during combustion, so that people can safely evacuate.

Optionally, n-nonanoic vanillylamide is contained within the cable jacket.

By adopting the technical scheme, the n-nonanoic acid vanillimide can enable the cable to play a role in preventing rats and ants, reduce the bite of rats and ants on the cable and further reduce the damage of the cable.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the metal shielding layer and the armor layer are made of metal materials, so that the gnawing of rats and ants is prevented, and the mechanical damage is reduced;

2. the semi-conductive water-blocking tape and the waterproof layer play a waterproof role, so that the cable is suitable for various environments;

3. the cable sheath of the cable contains low-smoke halogen-free material and n-nonanoic vanillylamide, so that the cable has the effects of flame retardance, rat prevention and ant prevention.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present application.

Description of reference numerals: 1. a conductor; 2. a protective layer; 21. a conductor shield layer; 22. an insulating layer; 23. an insulating shield layer; 3. a metal shielding layer; 31. a copper wire; 32. shielding the copper strip; 4. a semiconductive water-blocking tape; 5. a waterproof layer; 6. an armor layer; 7. a sheath layer.

Detailed Description

The present application is described in further detail below with reference to fig. 1.

The embodiment of the application discloses urban rail transit supplies power medium voltage power cable for looped netowrk. Referring to fig. 1, the medium voltage power cable for the urban rail transit power supply ring network comprises a cable core, wherein the cable core comprises a conductor 1 and a protective layer 2 arranged on the outer side of the conductor 1. The protective layer 2 includes a conductor shielding layer 21, an insulating layer 22 and an insulating shielding layer 23 arranged in sequence from inside to outside. Wherein, the conductor shielding layer 21, the insulating layer 22 and the insulation shielding layer 23 are extruded outside the conductor 1 by co-extrusion dry crosslinking, thereby keeping the uniform distribution of the electric field inside and outside the insulating layer 22.

Set up metallic shield 3 in the protective layer 2 outside, metallic shield 3 includes copper wire 31 and shielding copper strips 32, and the copper wire 31 is dredged around the outside at protective layer 2, and shielding copper strips 32 is reverse to be tied up in the one side that protective layer 2 was kept away from to copper wire 31.

One side of the metal shielding layer 3, which is far away from the cable core, is provided with a semi-conductive water-blocking tape 4, the semi-conductive water-blocking tape 4 is wound on one side of the shielding copper strip 32, which is far away from the copper wire 31, and the winding directions of the semi-conductive water-blocking tape 4 and the shielding copper strip 32 are opposite.

And a waterproof layer 5 is arranged on one side of the semiconductive water-blocking tape 4, which is far away from the metal shielding layer 3, the waterproof layer 5 is an aluminum-plastic composite tape, and the aluminum-plastic composite tape is sealed on the outer side of the semiconductive water-blocking tape 4 in a longitudinal wrapping mode. The waterproof layer 5 can prevent external moisture from entering the cable, meanwhile, the semi-conductive water-blocking tape 4 plays a second waterproof role between the metal shielding layer 3 and the waterproof layer 5, and after the semi-conductive water-blocking tape 4 contacts moisture, the semi-conductive water-blocking tape 4 expands to fill the damaged part, so that the protection effect is achieved at the same time.

The outside of waterproof layer 5 is provided with armor 6, and armor 6 sets up to the protection copper strips, and the winding of protection copper strips is in the outside of waterproof layer 5 for the gnawing of resisting mouse ant bites, inside the protection cable.

The sheath layer 7 is arranged on the outer side of the armor layer 6, the sheath layer 7 is a cable skin of the cable, the cable skin is made of low-smoke halogen-free flame-retardant materials, and meanwhile n-nonanoic acid vanilloylamine is contained in the cable skin. Wherein, the low-smoke halogen-free material plays a role in flame retardance, and reduces the generation of toxic and corrosive gases during combustion. In addition, n-nonanoic vanilloylamine has large irritation to rats and ants, and can prevent the rats and the ants from biting, thereby protecting cables.

The implementation principle of the medium-voltage power cable for the urban rail transit power supply looped network is as follows: the restrictive coating 7 of cable reduces the rat and ant and gnaws and stings, and armor 6 then gnaws the rat and ant or the impact of external force plays the effect of protection, reduces the mechanical damage that the cable received, and inside waterproof layer 5 prevented moisture entering cable, metal shielding layer 3 also played the effect of protection when playing the shielding effect in addition, from this the cable can be applicable to in the environment of complicacy.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The utility model provides a medium voltage power cable for urban rail transit power supply looped netowrk, includes the cable core, its characterized in that: the cable comprises a cable core and is characterized in that a metal shielding layer (3) is arranged on the outer side of the cable core, and a semi-conductive water blocking tape (4), a waterproof layer (5), an armor layer (6) and a sheath layer (7) are sequentially arranged on one side, far away from the cable core, of the metal shielding layer (3).

2. The medium voltage power cable for the urban rail transit power supply ring network according to claim 1, characterized in that: the cable core includes by interior and outer conductor (1) and the protective layer (2) that sets gradually, protective layer (2) are including conductor shielding layer (21), insulating layer (22) and insulation shielding layer (23) made by crowded dry process crosslinking altogether, and conductor shielding layer (21), insulating layer (22) and insulation shielding layer (23) keep away from conductor (1) in proper order.

3. The medium voltage power cable for the urban rail transit power supply ring network according to claim 1, characterized in that: the metal shielding layer (3) comprises a copper wire (31) wound on the outer side of the cable core belt, and a shielding copper belt (32) is reversely wound on one side, far away from the cable core, of the copper wire (31).

4. The medium voltage power cable for the urban rail transit power supply ring network according to claim 3, characterized in that: the semi-conductive water-blocking tape (4) is wound on one side, far away from the copper wire (31), of the shielding copper tape (32), and the winding direction of the semi-conductive water-blocking tape (4) is opposite to that of the shielding copper tape (32).

5. The medium voltage power cable for the urban rail transit power supply ring network according to claim 1, characterized in that: the waterproof layer (5) is an aluminum-plastic composite belt longitudinally wrapped on the outer side of the semi-conductive water-blocking belt (4).

6. The medium voltage power cable for the urban rail transit power supply ring network according to claim 1, characterized in that: the armor layer (6) is arranged to be a protective copper strip wound on the outer side of the waterproof layer (5).

7. The medium voltage power cable for the urban rail transit power supply ring network according to claim 1, characterized in that: the sheath layer (7) is made of low-smoke halogen-free materials.

8. The medium voltage power cable for the urban rail transit power supply ring network according to claim 7, characterized in that: the cable sheath internally contains n-nonanoic vanilloylamine.

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