CN219497407U - DC oil-immersed paper high-voltage cable capable of inhibiting torsion wire breakage - Google Patents

Abstract

The utility model discloses a torsion-breaking-inhibiting type direct-current oil-immersed paper high-voltage cable, which comprises an inner conductor, an oil-immersed paper insulating layer, an aluminum alloy sheath layer, a silane grafted crosslinked high-density polyethylene insulating layer, a high Wen Bo fiber band reinforced wrapping layer, a steel wire armor layer, a nylon anti-corrosion layer and a PVC outer sheath, wherein the inner conductor comprises an inner conductor layer and an outer conductor layer, three inner layer fan-shaped conductors are stranded to form the inner conductor layer, six outer layer fan-shaped conductors are stranded to form the outer conductor layer around the outer part of the inner conductor layer, the inner layer circumferential abutting surfaces contacted between adjacent inner layer fan-shaped conductors and the outer layer circumferential abutting surfaces contacted between adjacent outer layer fan-shaped conductors are arranged at intervals, insulating lubricating silicone grease is filled between the inner conductor layer and the outer conductor layer, and the inner conductor layer and the outer conductor layer are stranded to be identical. The cable inner conductor has better structural strength, can inhibit the loose, torsion and wire breakage phenomena of the copper stranded wire conductor when the cable is laid, ensures the electrical characteristics of the cable, reduces the laying construction difficulty and has better durability.

Description

DC oil-immersed paper high-voltage cable capable of inhibiting torsion wire breakage

Technical Field

The application relates to the technical field of cables, in particular to a torsion-breaking-inhibiting direct-current oil-immersed paper high-voltage cable.

Background

The high-voltage direct-current transmission has various advantages, such as low line cost, small loss, convenient power connection, easy control and the like, and the high-voltage direct-current transmission technology is mainly applied to direct-current transmission of long-distance large-capacity transmission, power system networking, long-distance submarine cable or large-city underground cable power transmission, power distribution network and the like. The high-voltage direct-current power cable has the advantages of high working electric field intensity, light weight, good flexibility, easy installation, small dielectric loss, low conductor loss, large current-carrying capacity, no alternating-current magnetic field and the like. However, due to the complex diversity of construction environments, under the condition that the laying conditions of the high-voltage direct-current power cable do not take sufficient precautions, after the common high-voltage direct-current power cable is stretched, bent and twisted to a certain extent, the inner conductor of the copper stranded wire is easy to loosen and deform to break after twisting, so that the electrical characteristics are seriously affected, and potential safety hazards are brought to the normal operation of the power system.

Disclosure of Invention

The application is to the not enough of prior art, and the technical problem that solves provides a restraining twists reverse broken line type direct current oil-immersed paper high tension cable, and the structural strength of inner conductor is better, can restrain the copper stranded conductor when cable laying and take place loose, twist reverse broken line phenomenon, guarantee the electrical property of cable, reduces the laying construction degree of difficulty, and the durability is better.

The technical problems are solved by the following technical scheme.

The utility model provides a restraint twists reverse broken string formula direct current oil-immersed paper high tension cable, includes the inner conductor and the outside cladding of inner conductor has oil-immersed paper insulating layer, aluminum alloy restrictive coating, silane grafting crosslinked high density polyethylene insulating layer, high Wen Bo fiber band reinforce around covering, steel wire armor, nylon anticorrosive coating and PVC oversheath in proper order, the inner conductor includes inner conductor layer and outer conductor layer, and three inner layer fan-shaped conductor transposition constitutes the inner conductor layer, six outer layer fan-shaped conductors are encircleed the outside transposition of inner conductor layer constitutes the outer conductor layer, adjacent the inner layer circumference butt joint face that contacts between the inner layer fan-shaped conductor and the outer circumference butt joint face circumference interval arrangement that contacts between the outer layer fan-shaped conductor, the inner conductor layer with fill insulating lubrication silicone grease between the outer conductor layer, the inner conductor layer hank to with the outer conductor layer hank is the same, inner layer fan-shaped conductor with outer layer fan-shaped conductor is a plurality of strands compound hank and sticiss into fan-shaped structure, the strand comprises a plurality of soft copper wire transposition, soft copper wire hank is to be opposite to the strand.

Preferably, the ratio of the lay length of the outer layer sector conductor to the lay length of the inner layer sector conductor is greater than 2 and not less than 5.

Preferably, the diameter of the soft copper wires of the inner layer fan-shaped conductor is not smaller than that of the soft copper wires of the outer layer fan-shaped conductor.

Preferably, the soft copper wire has a diameter of 0.08mm to 0.3mm.

Preferably, the thickness of the silane grafted crosslinked high density polyethylene insulating layer is 3mm to 5mm.

Preferably, the oil-immersed paper of the oil-immersed paper insulating layer is of a three-layer sandwich composite paper structure formed by kraft paper in the middle and PP films on two sides.

Preferably, the thickness of the nylon anticorrosive layer is not less than 0.1mm.

Preferably, the steel wire armor layer is formed by spirally winding and braiding double-layer galvanized steel wires.

Preferably, the thickness of the aluminum alloy sheath layer is 0.6mm to 0.8mm.

Preferably, the high-temperature glass fiber tape reinforced wrapping layer is an inner and outer double-layer high-temperature glass fiber wire mutually reverse spiral winding and weaving structure, and the thickness is not less than 0.5mm.

The beneficial effects of this application:

1. the inner conductor adopts a double-layer fan-shaped conductor compacting structure formed by an inner layer fan-shaped conductor and an outer layer fan-shaped conductor, has better structural strength, effectively prevents deformation wire breakage phenomenon caused by loosening of the inner conductor, is beneficial to improving tensile strength and bending resistance, is filled with insulating and lubricating silicone grease between the inner conductor layer and the outer conductor layer, is identical in twisting direction of the inner conductor layer and the outer conductor layer, and when the cable is subjected to stretching, bending and torsion, a sufficient antifriction effect is obtained between the inner conductor layer and the outer conductor layer, so that stress concentration at the mutual contact position of the inner conductor layer and the outer conductor layer is helped to be relieved, torque force is reduced, meanwhile, inner layer circumferential butt joint surfaces contacted between adjacent inner layer fan-shaped conductors and outer layer circumferential butt joint surfaces contacted between adjacent outer layer fan-shaped conductors are circumferentially arranged at intervals and staggered with each other, soft copper wire torsion wire breakage can be easily caused under the stress effect due to mutual contact of the inner layer circumferential butt joint surfaces, excellent electrical characteristics of the cable are guaranteed, laying construction difficulty is reduced, and durability is better.

2. The diameter of the soft copper wire of the inner layer fan-shaped conductor is not smaller than that of the soft copper wire of the outer layer fan-shaped conductor, so that the extension of the cable is balanced and absorbed, the mechanical stress is eliminated, the laying adaptability of the inner layer fan-shaped conductor in complex and diverse environments on site is improved, the tensile strength of the inner layer fan-shaped conductor is larger than that of the outer layer fan-shaped conductor, the occurrence of torsion broken wires is restrained, and the torsion resistance of the cable is improved.

3. The original lead sheath is replaced by the light aluminum alloy sheath, so that the environment protection is facilitated, the health hazard of lead elements to surrounding people is reduced, the light and light preparation of the cable is realized, meanwhile, the high Wen Bo fiber band reinforcing wrapping layer is added, the stress concentration problem of the aluminum alloy sheath layer and the steel wire armor layer is reduced, the torque force during bending is reduced, the cracking of the aluminum alloy sheath layer is prevented, the electrical characteristics of the cable are guaranteed, and the durable usability is better.

Drawings

Fig. 1 is a schematic cross-sectional structure of an embodiment of the present application.

Reference numerals illustrate:

the high-temperature glass fiber reinforced plastic composite cable sheath comprises a 1-inner conductor, a 2-oil immersed paper insulating layer, a 3-aluminum alloy sheath layer, a 4-silane grafted crosslinked high-density polyethylene insulating layer, a 5-high-temperature glass fiber reinforced plastic wrapping layer, a 6-steel wire armor layer, a 7-nylon anticorrosive layer, an 8-PVC outer sheath, a 9-inner layer fan-shaped conductor, a 10-outer layer fan-shaped conductor, an 11-inner layer circumferential abutting surface, a 12-outer layer circumferential abutting surface and 13-insulating lubricating silicone grease.

Detailed Description

The terminology used in the description of the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application, as will be described in detail with reference to the accompanying drawings.

Referring to fig. 1, the torsion-breaking-inhibiting type direct current oil-immersed paper high-voltage cable of the embodiment of the application comprises an inner conductor 1, wherein the inner conductor 1 comprises an inner conductor layer and an outer conductor. Three inner layer sector conductors 9 are twisted to form the inner conductor layer, six outer layer sector conductors 10 are twisted around the outside of the inner conductor layer to form the outer conductor layer, and further, the ratio of the twisting pitch of the outer layer sector conductors 10 to the twisting pitch of the inner layer sector conductors 9 is more than 2 and not less than 5. The inner layer sector conductor 9 and the outer layer sector conductor 10 are both formed by twisting a plurality of strands and compressing the strands into a sector structure, the strands are formed by twisting a plurality of soft copper wires, specifically, the diameter of the soft copper wires is 0.08mm to 0.3mm, and further, the diameter of the soft copper wires of the inner layer sector conductor 9 is not smaller than that of the soft copper wires of the outer layer sector conductor 10. The soft copper wires are twisted in a direction opposite to the strand. The inner circumferential butt joint surfaces 11 contacted between the adjacent inner sector conductors 9 and the outer circumferential butt joint surfaces 12 contacted between the adjacent outer sector conductors 10 are circumferentially arranged at intervals, insulating and lubricating silicone grease 13 is filled between the inner conductor layers and the outer conductor layers, and the twisting directions of the inner conductor layers are the same as those of the outer conductor layers.

The outer part of the inner conductor 1 is sequentially coated with an oil immersed paper insulating layer 2, an aluminum alloy sheath layer 3, a silane grafted crosslinked high-density polyethylene insulating layer 4, a high Wen Bo fiber band reinforced wrapping layer 5, a steel wire armor layer 6, a nylon anti-corrosion layer 7 and a PVC outer sheath 8. Specifically, the oil-immersed paper of the oil-immersed paper insulating layer 2 is of a three-layer sandwich composite paper structure formed by kraft paper in the middle and PP films on two sides. The thickness of the silane grafted crosslinked high-density polyethylene insulating layer 4 is 3mm to 5mm. The thickness of the aluminum alloy sheath layer 3 is 0.6mm to 0.8mm. In one embodiment, the high-temperature glass fiber tape reinforced wrapping layer 5 is an inner and outer double-layer high-temperature glass fiber wire which is of a reverse spiral winding weaving structure and has a thickness not smaller than 0.5mm. In one embodiment, the steel wire armor layer 6 is formed by spirally winding and braiding double-layer galvanized steel wires. The thickness of the nylon anticorrosive layer 7 is not less than 0.1mm.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the embodiments of the present application, and are not limited thereto; although embodiments of the present application have been described in detail with reference to the foregoing embodiments, it will be appreciated by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. The torsion-breaking-inhibiting type direct-current oil-immersed paper high-voltage cable is characterized in that: including inner conductor (1) and the outside cladding in proper order of inner conductor (1) has oily paper insulating layer (2), aluminum alloy restrictive coating (3), silane grafting crosslinked high density polyethylene insulating layer (4), high Wen Bo fiber band reinforce around covering (5), steel wire armor (6), nylon anticorrosive coating (7) and PVC oversheath (8), inner conductor (1) include inner conductor layer and outer conductor layer, three inner layer fan-shaped conductor (9) transposition constitution inner conductor layer, six outer layer fan-shaped conductor (10) are around the outside transposition of inner conductor layer constitutes outer conductor layer, adjacent inner layer circumference butt joint face (11) that contacts between inner layer fan-shaped conductor (9) and adjacent outer circumference butt joint face (12) circumference interval arrangement that contacts between outer layer fan-shaped conductor (10), the inner conductor layer with fill between the outer conductor layer and have insulating lubricated silicone grease (13), inner conductor layer hank is to the same with outer conductor layer hank, inner layer fan-shaped conductor (9) and outer layer fan-shaped conductor (10) are the copper stranded wire, and form a plurality of opposite stranded wire to the hank wire to the soft strand wire.

2. The torsion-breaking-inhibiting direct-current oil-immersed paper high-voltage cable according to claim 1, characterized in that: the ratio of the lay length of the outer layer sector conductor (10) to the lay length of the inner layer sector conductor (9) is more than 2 and not less than 5.

3. The torsion-breaking-inhibiting direct-current oil-immersed paper high-voltage cable according to claim 1, characterized in that: the diameter of the soft copper wires of the inner layer fan-shaped conductor (9) is not smaller than that of the soft copper wires of the outer layer fan-shaped conductor (10).

4. The torsion-breaking-inhibiting direct-current oil-immersed paper high-voltage cable according to claim 1, characterized in that: the diameter of the soft copper wire is 0.08mm to 0.3mm.

5. The torsion-breaking-inhibiting direct-current oil-immersed paper high-voltage cable according to claim 1, characterized in that: the thickness of the silane grafted crosslinked high-density polyethylene insulating layer (4) is 3mm to 5mm.

6. The torsion-breaking-inhibiting direct-current oil-immersed paper high-voltage cable according to claim 1, characterized in that: the oil-immersed paper of the oil-immersed paper insulating layer (2) is of a three-layer sandwich composite paper structure formed by kraft paper in the middle and PP films on two sides.

7. The torsion-breaking-inhibiting direct-current oil-immersed paper high-voltage cable according to claim 1, characterized in that: the thickness of the nylon anti-corrosion layer (7) is not less than 0.1mm.

8. The torsion-breaking-inhibiting direct-current oil-immersed paper high-voltage cable according to claim 1, characterized in that: the steel wire armor layer (6) is formed by spirally winding and braiding double-layer galvanized steel wires.

9. The torsion-breaking-inhibiting direct-current oil-immersed paper high-voltage cable according to claim 1, characterized in that: the thickness of the aluminum alloy sheath layer (3) is 0.6mm to 0.8mm.

10. The torsion-breaking-inhibiting direct-current oil-immersed paper high-voltage cable according to claim 1, characterized in that: the high-temperature glass fiber tape reinforced wrapping layer (5) is an inner-outer double-layer high-temperature glass fiber wire mutually reverse spiral winding and weaving structure, and the thickness is not less than 0.5mm.