CN210015724U

CN210015724U - Middle-high voltage crosslinked polyethylene cable

Info

Publication number: CN210015724U
Application number: CN201921144662.0U
Authority: CN
Inventors: 顾祝军; 余健
Original assignee: Zhejiang Genggu Cable Co Ltd
Current assignee: Zhejiang Genggu Cable Co Ltd
Priority date: 2019-07-19
Filing date: 2019-07-19
Publication date: 2020-02-04
Anticipated expiration: 2029-07-19

Abstract

The utility model belongs to the technical field of the cable, a well high voltage crosslinked polyethylene cable is related to, it has solved technical problem such as current cable bending resistance is poor, yielding. This polyethylene cable is including being located the conductor of central part, and the conductor overcoat is equipped with the semi-conductive area, and the semi-conductive area overcoat is equipped with the insulation and shielding subassembly, and the insulation and shielding subassembly overcoat is equipped with the water blocking layer, and the water blocking layer overcoat is equipped with the aluminium sheath, and the aluminium sheath overcoat is equipped with the oversheath, and its characterized in that, the lateral wall of aluminium sheath is provided with a plurality of strengthening ribs along self length direction, and the draw-in groove with strengthening rib interference fit is seted up to the inside wall. Because the side wall design at aluminium sheath has the strengthening rib, therefore its bending resistance obtains certain enhancement, and aluminium sheath is difficult for taking place to warp during cable laying to guarantee that aluminium sheath and water blocking layer have suitable assembly distance, each subassembly is difficult for taking place to damage, thereby improves the operating stability of cable.

Description

Middle-high voltage crosslinked polyethylene cable

Technical Field

The utility model belongs to the technical field of the cable, a well high voltage crosslinked polyethylene cable is related to.

Background

The cross-linked polyethylene (XLPE) cable has the advantages of light structure, excellent electrical performance, convenience in laying and the like, and is widely applied to high-voltage power grids. In the operation process of the power cable, the power cable can be influenced by external complex environments, such as the action of multiple factors of electricity, magnetism, heat, chemistry, machinery and the like, and local defects of insulating air gaps, bulges and the like can exist in the manufacturing process, so that the insulation of the cable is gradually aged, and finally, local discharge is caused, so that the main insulation of the cable is broken down, and the ground fault is generated.

The cable jacket insulation may have the following major failures:

firstly, the damage of the sheath causes the multipoint grounding of the metal sheath of the cable, the metal sheath generates circulation current to cause loss heating, the local overheating of insulation and accelerated insulation aging are caused, and the service life of the main insulation is seriously influenced;

secondly, the damage of the sheath insulation causes the intrusion of water, the probability of water tree aging of the main insulation is increased, and the service life of the cable is seriously influenced;

thirdly, the cable is locally broken down and discharged due to the over-high induced voltage of the sheath, and the normal operation of the cable is seriously influenced.

While the cable is bent to a certain degree when in actual use, the metal sheath of the cable in the prior art is not easy to bend along with the bending,

chinese patent CN 103268786A discloses a longitudinal water-blocking aluminum sheath crosslinked polyethylene cable, which comprises a conductor, a semi-conductive wrapping tape layer, an inner shielding layer, an insulating layer, an outer shielding layer, a water-blocking wrapping tape layer, a longitudinal water-blocking aluminum sheath layer, an asphalt layer and an outer sheath layer. The longitudinal water-blocking aluminum sheath layer is composed of a water-blocking material layer and an aluminum plate layer, and is formed by fine cutting, roll forming, welding and embossing detection in a composite mode, so that longitudinal water blocking is realized.

However, in the procedures of cable laying traction and curling of the aluminum sheath, the aluminum sheath is easily changed from a round shape to an oval shape, which is not beneficial to cable laying, and the aluminum sheath, the water blocking tape and the cable inner core are mutually contacted and damaged, so that the cable is scrapped. And in the production of the welding seam wrinkle aluminum sleeve, if the short ruler occurs, the cable length is insufficient, and a cable factory cannot deliver the cable.

SUMMERY OF THE UTILITY MODEL

The utility model aims at having the above-mentioned problem to current technique, provided a well high voltage crosslinked polyethylene cable, the utility model aims to solve the technical problem that: how to improve the operation stability of the cable by reducing the deformation of the aluminum sheath during the cable laying.

The purpose of the utility model can be realized by the following technical proposal:

the utility model provides a well high voltage crosslinked polyethylene cable, the polyethylene cable is including the conductor that is located the central point, the conductor overcoat is equipped with the semi-conductive area, the semi-conductive area overcoat is equipped with the insulation shield subassembly, the insulation shield subassembly overcoat is equipped with the water blocking layer, the water blocking layer overcoat is equipped with the aluminium sheath, the aluminium sheath overcoat is equipped with the oversheath, a serial communication port, the lateral wall of aluminium sheath is provided with a plurality of strengthening ribs along self length direction, the inside wall of oversheath seted up with strengthening rib interference fit's draw-in groove.

The working principle is as follows: because the side wall design at aluminium sheath has the strengthening rib, therefore its bending resistance obtains certain enhancement, and aluminium sheath is difficult for taking place to warp during cable laying to guarantee that aluminium sheath and water blocking layer have suitable assembly distance, each subassembly is difficult for taking place to damage, thereby improves the operating stability of cable. Meanwhile, the aluminum sheath and the outer sheath can be positioned relatively in the circumferential direction, slippage is not easy to occur, and the effect of improving the operation stability of the cable can be achieved.

In the above-mentioned medium and high voltage crosslinked polyethylene cable, the insulation shielding component includes conductor shielding layer, XLPE insulating layer and insulation shielding layer that from inside to outside sets gradually.

In foretell well high pressure crosslinked polyethylene cable, the aluminium sheath is formed by a plurality of sleeve end to end welding, all is provided with the strengthening rib on the every sleeve, the both ends and the telescopic both ends of strengthening rib are leveled mutually, and the one end of strengthening rib is provided with the boss that surpasses the sleeve terminal surface, the other end of strengthening rib is provided with the recess, the boss of strengthening rib on the sleeve can rather than the recess looks joint of the strengthening rib on the adjacent sleeve. When the aluminum sheath is welded, the bosses on the reinforcing ribs can be inserted into the reinforcing rib grooves on the adjacent sheaths, and then welding is carried out, so that the effect of positioning and convenient welding can be achieved, and the overall strength of the cable can be ensured.

In the above medium-high voltage crosslinked polyethylene cable, a gap is formed between the side wall of the groove and the side wall of the boss. Because the cable can meet the condition that needs buckle when actually laying, and the design has the clearance between recess and the boss, then can make the bending that the strengthening rib wholly can adapt to the cable.

In the above-mentioned medium-high voltage crosslinked polyethylene cable, all be provided with 4 on every telescopic lateral wall the strengthening rib, and the strengthening rib uses telescopic axis to be annular evenly distributed as the central line. 4 annular reinforcing ribs which are uniformly distributed are designed on each sleeve, so that the bending resistance and the deformation resistance in all directions can be ensured.

Compared with the prior art, the utility model has the advantages of it is following:

because the side wall design at aluminium sheath has the strengthening rib, therefore its bending resistance obtains certain enhancement, and aluminium sheath is difficult for taking place to warp during cable laying to guarantee that aluminium sheath and water blocking layer have suitable assembly distance, each subassembly is difficult for taking place to damage, thereby improves the operating stability of cable.

Drawings

Fig. 1 is a schematic structural diagram of the polyethylene cable.

Fig. 2 is a schematic structural view of the present sleeve.

In the figure, 1, a conductor; 2. a semiconducting tape; 3. a water resistant layer; 4. an aluminum sheath; 5. an outer sheath; 6. reinforcing ribs; 7. a card slot; 8. a conductor shield layer; 9. an XLPE insulating layer; 10. an insulating shield layer; 11. a sleeve; 12. a boss; 13. and (4) a groove.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1, the polyethylene cable includes a conductor 1 located at a central portion, a semi-conductive tape 2 is sleeved outside the conductor 1, and an insulation shielding assembly is sleeved outside the semi-conductive tape 2, and in this embodiment, the insulation shielding assembly includes a conductor shielding layer 8, an XLPE insulation layer 9, and an insulation shielding layer 10, which are sequentially arranged from inside to outside. Insulating shielding subassembly overcoat is equipped with water blocking layer 3, and 3 overcoat of water blocking layer are equipped with aluminium sheath 4, and 4 overcoat of aluminium sheath are equipped with oversheath 5.

As shown in fig. 1, the outer side wall of the aluminum sheath 4 is provided with a plurality of reinforcing ribs 6 along the length direction thereof, and the inner side wall of the outer sheath 5 is provided with a clamping groove 7 in interference fit with the reinforcing ribs 6.

Preferably, as shown in fig. 2, the aluminum sheath 4 is formed by welding a plurality of sleeves 11 end to end, each sleeve 11 is provided with a reinforcing rib 6, preferably, the outer side wall of each sleeve 11 is provided with 4 reinforcing ribs 6, and the reinforcing ribs 6 are uniformly distributed in a ring shape with the axis of the sleeve 11 as the center line.

As a further option, both ends of the reinforcing rib 6 are flush with both ends of the sleeve 11, and one end of the reinforcing rib 6 is provided with a boss 12 which exceeds the end surface of the sleeve 11, and the other end of the reinforcing rib 6 is provided with a groove 13, and the boss 12 of the reinforcing rib 6 on the sleeve 11 can be clamped with the groove 13 of the reinforcing rib 6 on the sleeve 11 adjacent to the boss. There is a gap between the side wall of the groove 13 and the side wall of the boss 12.

The working principle of the utility model is as follows: because the side wall of the aluminum sheath 4 is designed with the reinforcing ribs 6, the bending resistance of the aluminum sheath is enhanced to a certain extent, and the aluminum sheath 4 is not easy to deform during cable laying, so that the aluminum sheath 4 and the water blocking layer 3 are ensured to have proper assembly distance, and each component is not easy to damage, thereby improving the operation stability of the cable.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides a well high voltage crosslinked polyethylene cable, the polyethylene cable is including conductor (1) that is located the central point, conductor (1) overcoat is equipped with semi-conductive area (2), semi-conductive area (2) overcoat is equipped with the insulation shielding subassembly, the insulation shielding subassembly overcoat is equipped with water blocking layer (3), water blocking layer (3) overcoat is equipped with aluminium sheath (4), aluminium sheath (4) overcoat is equipped with oversheath (5), a serial communication port, the lateral wall of aluminium sheath (4) is provided with a plurality of strengthening ribs (6) along self length direction, the inside wall of oversheath (5) seted up with strengthening rib (6) interference fit's draw-in groove (7).

2. The medium-high voltage crosslinked polyethylene cable according to claim 1, wherein the insulation shield assembly comprises a conductor shield layer (8), an XLPE insulation layer (9) and an insulation shield layer (10) arranged in sequence from inside to outside.

3. The medium-high voltage crosslinked polyethylene cable according to claim 1, wherein the aluminum sheath (4) is formed by welding a plurality of sleeves (11) end to end, each sleeve (11) is provided with a reinforcing rib (6), the two ends of each reinforcing rib (6) are flush with the two ends of each sleeve (11), one end of each reinforcing rib (6) is provided with a boss (12) exceeding the end surface of each sleeve (11), the other end of each reinforcing rib (6) is provided with a groove (13), and the bosses (12) of the reinforcing ribs (6) on the sleeves (11) can be clamped with the grooves (13) of the reinforcing ribs (6) on the adjacent sleeves (11).

4. The medium-high voltage crosslinked polyethylene cable according to claim 3, wherein a gap is provided between the side wall of the groove (13) and the side wall of the boss (12).

5. The medium-high voltage crosslinked polyethylene cable according to claim 4, wherein 4 reinforcing ribs (6) are arranged on the outer side wall of each sleeve (11), and the reinforcing ribs (6) are uniformly distributed in a ring shape by taking the axis of the sleeve (11) as the center line.