CN211376216U

CN211376216U - Copper core crosslinked polyethylene insulated metal armored polyvinyl chloride sheath water-blocking power cable

Info

Publication number: CN211376216U
Application number: CN201922311249.5U
Authority: CN
Inventors: 王琴; 刘战宾; 闫欠
Original assignee: Wuxi Jiangnan Cable Co Ltd
Current assignee: Wuxi Jiangnan Cable Co Ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-08-28
Anticipated expiration: 2029-12-20

Abstract

The utility model discloses a copper core crosslinked polyethylene insulated metal armor polyvinyl chloride sheath power cable that blocks water, including the middling pressure insulation sinle silk that blocks water, many blocks water after middling pressure insulation sinle silk and many fill ropes that block water strand together and overlap and wrap first two-sided water blocking tape and form the cable core, crowded package polyethylene inner sheath outside the cable core, overlap and wrap second two-sided water blocking tape outside polyethylene inner sheath, overlap again after second two-sided water blocking tape is wrapped around the steel band armor outside and wrap third two-sided water blocking tape, crowded package polyvinyl chloride oversheath outside the third two-sided water blocking tape; the double-layer water-blocking structure of the water-blocking conductor and the inner and outer metal layers greatly reduces the occurrence of 'water trees', ensures that the cable can run safely and reliably for a long time and is convenient for clients to install and lay; the cable has improved electrical performance compared with common crosslinked cables and excellent waterproof performance, so the cable has wide application range and is particularly suitable for underground laying of cables in high rainfall areas and low-lying humid areas.

Description

Copper core crosslinked polyethylene insulated metal armored polyvinyl chloride sheath water-blocking power cable

Technical Field

The utility model relates to a cable conductor field specifically is a copper core crosslinked polyethylene insulated metal armor polyvinyl chloride sheath power cable that blocks water.

Background

The gradual replacement of overhead cables by medium-high voltage power cables is a necessary trend of industry development, and the optimization of power transmission lines of 35kV and the like is gradually pushed to the construction and the transformation of a power grid. With the continuous expansion of the application range, the laying environment is increasingly complex, and the breakdown fault of the cable caused by the water tree causes high attention in the same domestic and foreign lines. The research and manufacture of a medium-voltage crosslinked cable with a waterproof function from the end of 80 years and the beginning of 90 years in the United states, Japan and Germany leads to the improvement of the safety, reliability and service life of the cable by several times. China seriously puts forward the problem of 'water trees' in the middle of the 90 s, develops and develops a crosslinked cable capable of effectively adapting to complex environments, and becomes an urgent need in the economic construction of China; the waterproof cable must have the function of preventing moisture in the cable from longitudinally moving, limiting the moisture at a certain position and preventing the moisture from moving to an insulation weak link in the cable. However, if the sheath of the cable is permeable, the water-blocking effect is of little value; only if the penetration of external moisture is blocked firstly, the longitudinal water blocking function has practical significance for limiting the migration of the moisture in the cable.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve the problem that exists among the prior art, provide a copper core crosslinked polyethylene insulated metal armor polyvinyl chloride sheath power cable that blocks water.

The utility model relates to a copper core crosslinked polyethylene insulated metal armor polyvinyl chloride sheath power cable that blocks water, including every layer flat drag indulge the package block the surface of water surface outward single face water blocking area or 2 kinds of transposition of paper that blocks water compress round copper conductor, compress round copper conductor outward at 2 kinds of transposition and wrap the semi-conductive water blocking tie-up area that blocks water surface inward, tie up the outband three-layer crowded conductor shielding layer, insulating layer and insulating shielding layer altogether at semi-conductive water blocking, wrap first semi-conductive double-sided water blocking area and second semi-conductive double-sided water blocking area outside insulating shielding layer in proper order, overlap the soft copper tape metal shielding layer between first semi-conductive double-sided water blocking area and second semi-conductive double-sided water blocking area, form the medium voltage insulation sinle silk that blocks water; the wrapping thickness ratio of the first semiconductive double-sided water-blocking tape to the second semiconductive double-sided water-blocking tape is 1:1.5-1: 2;

the water-blocking medium-voltage insulated wire cores and the water-blocking filling ropes are twisted together and then overlapped and wrapped with the first double-sided water-blocking tape to form a cable core, a polyethylene inner protective layer is extruded outside the cable core, a second double-sided water-blocking tape is overlapped and wrapped outside the polyethylene inner protective layer, a third double-sided water-blocking tape is overlapped and wrapped again after a steel tape armor layer is wrapped outside the second double-sided water-blocking tape, and a polyvinyl chloride outer sheath is extruded outside the third double-sided water-blocking tape; the wrapping thickness ratio of the first double-sided water-blocking tape to the second double-sided water-blocking tape to the third double-sided water-blocking tape is 1.5:1:2-2:1: 2.5.

Further improved, the insulating layer is a crosslinked polyethylene insulating layer, and the thickness of the insulating layer is 0.45-0.50 mm.

The first semi-conductive double-sided water-blocking tape is formed by compounding semi-conductive non-woven fabrics, polyurethane waterproof films, polyester fiber cloth and semi-conductive non-woven fabrics from top to bottom, and the thickness of the first semi-conductive double-sided water-blocking tape is 2 mm.

The second semi-conductive double-sided water-blocking tape is formed by compounding semi-conductive non-woven fabrics, polyester fiber fabrics, a water-absorbing resin layer and semi-conductive non-woven fabrics from top to bottom, and the thickness of the second semi-conductive double-sided water-blocking tape is 3-4 mm.

The first double-sided water-blocking tape, the second double-sided water-blocking tape and the third double-sided water-blocking tape are of the same structure and are formed by compounding a polyester non-woven fabric, an adhesive layer and a high-speed expanded high-molecular water-absorbing resin layer from top to bottom.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the double-layer water-blocking structure of the water-blocking conductor and the inner and outer metal layers greatly reduces the occurrence of 'water trees', ensures that the cable can run safely and reliably for a long time and is convenient for clients to install and lay; the semi-conductive water-blocking tape is adopted inside and outside, so that when the temperature of the cable rises to cause thermal expansion, the buffer effect is achieved, the mechanical damage caused by the thermal expansion can be reduced, and the expansion of the release amount can be effectively prevented; the cable has improved electrical performance compared with common crosslinked cables and excellent waterproof performance, so the cable has wide application range and is particularly suitable for underground laying of cables in high rainfall areas and low-lying humid areas.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the first semiconductive double-sided waterproofing tape of the present invention;

fig. 3 is a schematic structural view of a second semiconductive double-sided water-blocking tape according to the present invention;

fig. 4 is a schematic structural view of the double-sided water-blocking tape of the present invention.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

As shown in figure 1, the copper core crosslinked polyethylene insulated metal armored polyvinyl chloride sheath water-blocking power cable comprises 2 types of stranded compact round copper conductors 1 with each layer of flat dragging longitudinal wrapping single-sided water-blocking tape or water-blocking paper with the water surface facing outwards, a semi-conductive water-blocking binding tape 2 with the water surface facing inwards wrapping the class 2 stranded compact round copper conductors, a conductor shielding layer 3, an insulating layer 4 and an insulating shielding layer 5 co-extruded from the semi-conductive water-blocking binding tape, a first semi-conductive double-sided water-blocking tape 6 and a second semi-conductive double-sided water-blocking tape 8 wrapping the insulating shielding layer in sequence, a soft copper tape metal shielding layer 7 overlapping and wrapping the semi-conductive double-sided water-blocking tape to form a water-blocking medium-voltage insulated wire core, a double-layer water-blocking structure between the water-blocking conductor and the metal layer, water tree occurrence is greatly reduced, and the cable can run safely and reliably for a long time, and is convenient for the customer to install and lay; the wrapping thickness ratio of the first semiconductive double-sided water-blocking tape to the second semiconductive double-sided water-blocking tape is 1:1.5-1:2, and when the thickness of the first semiconductive double-sided water-blocking tape is 2mm, the thickness of the second semiconductive double-sided water-blocking tape is 3-4 mm;

the multiple water-blocking medium-voltage insulated wire cores and the multiple water-blocking filling ropes 9 are twisted together and then are wrapped with the first double-sided water-blocking tape 10 in an overlapping mode to form a cable core, a polyethylene inner protective layer 11 is extruded outside the cable core, a second double-sided water-blocking tape 12 is wrapped outside the polyethylene inner protective layer in an overlapping mode, a third double-sided water-blocking tape 14 is wrapped outside the second double-sided water-blocking tape in an overlapping mode after a steel tape armor layer 13 is wrapped outside the second double-sided water-blocking tape, and a polyvinyl chloride outer sheath 15 is extruded outside the third double-sided water-; the wrapping thickness ratio of the first double-sided water-blocking tape, the second double-sided water-blocking tape and the third double-sided water-blocking tape is 1.5:1:2-2:1:2.5, when the thickness of the second double-sided water-blocking tape is 2mm, the thickness of the first double-sided water-blocking tape is 3-4mm, and the thickness of the third double-sided water-blocking tape is 4-5mm, the electric performance of the cable is improved compared with that of a common crosslinked cable, and the cable has excellent waterproof performance, so that the cable is wide in application range and is particularly suitable for underground laying of cables in high rainfall zone and low-lying humid area.

As shown in fig. 2, the first semi-conductive double-sided water-blocking tape is formed by extending and pressing a semi-conductive non-woven fabric 16, a polyurethane waterproof film 17, a polyester fiber cloth 18 and a semi-conductive non-woven fabric 16 from top to bottom, the semi-conductive non-woven fabric, the polyurethane waterproof film 17, the polyester fiber cloth 18 and the semi-conductive non-woven fabric 16 are bonded with each other through an adhesive, the thickness of the semi-conductive double-sided water-blocking tape is 2mm, the outer surface of the double-sided water-blocking tape has semi-conductive characteristics, the electric field intensity can be effectively weakened, the diameter of a polyurethane waterproof film hole of an inner layer is very small and is only 10-50 μm, the diameter is between water vapor with the diameter of 4X10-4 μm and water drops with the diameter of 100-, particularly has the performances of high tear resistance, good elasticity, low-temperature flexibility, oil resistance, low-temperature resistance, thermal aging resistance, ozone resistance and the like;

as shown in fig. 3, the second semiconductive double-sided water-blocking tape is formed by compounding a semiconductive non-woven fabric 16, a polyester fiber fabric 18, a water-absorbent resin layer 19 and a semiconductive non-woven fabric 16 from top to bottom, the semiconductive non-woven fabric, the polyester fiber fabric, the water-absorbent resin layer 19 and the semiconductive non-woven fabric 16 are bonded through an adhesive, the thickness of the second semiconductive double-sided water-blocking tape is 3-4mm, the second semiconductive double-sided water-blocking tape is different from the second semiconductive double-sided water-blocking tape in that the second semiconductive double-sided water-;

as shown in fig. 4, the double-sided water-blocking tape is formed by compounding a polyester non-woven fabric 20, an adhesive layer 21 and a high-speed-expansion high-polymer water-absorbent resin layer 22 from top to bottom, and the first double-sided water-blocking tape, the second double-sided water-blocking tape and the third double-sided water-blocking tape all adopt the structure, so that the cable has the advantages of good strength, air permeability, water resistance, environmental protection, flexibility, no toxicity, no odor and certain water absorption function.

The cable has improved electrical performance compared with common crosslinked cables and excellent waterproof performance, so the cable has wide application range and is particularly suitable for underground laying of cables in high rainfall areas and low-lying humid areas.

The utility model discloses the concrete application way is many, and the above-mentioned only is the preferred embodiment of the utility model, should point out, to ordinary skilled person in this technical field, under the prerequisite that does not deviate from the utility model discloses the principle, can also make a plurality of improvements, and these improvements also should be regarded as the utility model discloses a scope of protection.

Claims

1. The utility model provides a copper core crosslinked polyethylene insulated metal armor polyvinyl chloride sheath power cable that blocks water which characterized in that: the method comprises the following steps that each layer of 2-type stranded longitudinally-wrapped single-sided water-blocking tape or water-blocking paper with the water surface facing outwards is used for tightly pressing a round copper conductor, the 2-type stranded tightly-pressed round copper conductor is wrapped with a semi-conductive water-blocking binding tape with the water surface facing inwards, the semi-conductive water-blocking binding tape is wrapped with a conductor shielding layer, an insulating layer and an insulating shielding layer in a three-layer co-extruded mode outside the semi-conductive water-blocking binding tape, a first semi-conductive double-sided water-blocking tape and a second semi-conductive double-sided water-blocking tape are sequentially wrapped outside the insulating shielding layer, and a soft copper tape metal shielding layer is wrapped between the first semi-conductive double; the wrapping thickness ratio of the first semiconductive double-sided water-blocking tape to the second semiconductive double-sided water-blocking tape is 1:1.5-1: 2;

2. The copper-core crosslinked polyethylene insulated metal armored polyvinyl chloride sheath water-blocking power cable according to claim 1, wherein: the insulating layer is a crosslinked polyethylene insulating layer with the thickness of 0.45-0.50 mm.

3. The copper-core crosslinked polyethylene insulated metal armored polyvinyl chloride sheath water-blocking power cable according to claim 1, wherein: the first semi-conductive double-sided water-blocking tape is composed of semi-conductive non-woven fabrics, a polyurethane waterproof film, polyester fiber fabrics and semi-conductive non-woven fabrics from top to bottom, and the thickness of the first semi-conductive double-sided water-blocking tape is 2 mm.

4. The copper-core crosslinked polyethylene insulated metal armored polyvinyl chloride sheath water-blocking power cable according to claim 1, wherein: the second semi-conductive double-sided water-blocking tape is composed of semi-conductive non-woven fabric, polyester fiber cloth, a water-absorbing resin layer and semi-conductive non-woven fabric from top to bottom, and the thickness of the second semi-conductive double-sided water-blocking tape is 3-4 mm.

5. The copper-core crosslinked polyethylene insulated metal armored polyvinyl chloride sheath water-blocking power cable according to claim 1, wherein: the first double-sided water-blocking tape, the second double-sided water-blocking tape and the third double-sided water-blocking tape have the same structure and are composed of a polyester non-woven fabric, an adhesive layer and a high-speed expanded high-molecular water-absorbing resin layer from top to bottom.