CN216311386U - Energy-saving environment-friendly ultra-high voltage cable with smooth special aluminum alloy sheath - Google Patents

Energy-saving environment-friendly ultra-high voltage cable with smooth special aluminum alloy sheath Download PDF

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Publication number
CN216311386U
CN216311386U CN202122766944.8U CN202122766944U CN216311386U CN 216311386 U CN216311386 U CN 216311386U CN 202122766944 U CN202122766944 U CN 202122766944U CN 216311386 U CN216311386 U CN 216311386U
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China
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shield
aluminum alloy
layer
semi
sheath
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江巍
沈智飞
石洪志
刘洪军
潘仁勇
张恒玮
栾渊明
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Sunway Co Ltd
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Sunway Co Ltd
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Abstract

The utility model discloses a smooth special aluminum alloy sheath energy-saving environment-friendly ultrahigh-voltage cable, and belongs to the technical field of ultrahigh-voltage cables. The utility model relates to a smooth special aluminum alloy sheath energy-saving environment-friendly ultrahigh voltage cable, which comprises a conductor, a conductor wrapped shield, a conductor extruded shield, an insulation shield, a semi-conductive buffer layer a, a metal shield, a semi-conductive buffer layer b, a metal sheath and an anticorrosive layer, an outer sheath and a semi-conductive layer.

Description

Energy-saving environment-friendly ultra-high voltage cable with smooth special aluminum alloy sheath
Technical Field
The utility model relates to the field of cable manufacturing, in particular to a smooth special aluminum alloy sheath energy-saving environment-friendly ultrahigh-voltage cable.
Background
The 66kV-500kV ultrahigh voltage cable is mainly used for large-capacity electric energy transmission, and a corrugated aluminum sheath structure is adopted in a traditional metal sheath.
The problems of white powder, ablation, breakdown and the like of a buffer layer below the corrugated aluminum sheath of the ultrahigh-voltage cable are sequentially caused from 2004. The mechanism of the generation is that the air gap exists between the buffer layer and the metal protective layer of the corrugated aluminum sheath structure, the electrical connection between the outer shield and the metal sheath is not tight, point contact is formed, and the charging current, the insulating layer leakage current, the neutral point current, the unbalanced current, the fault current and the surge current which are generated in the electrified operation of the cable can unevenly flow through the buffer layer, so that the surface of the outer shield forms a potential difference, a primary battery discharge mechanism is locally formed, and burning is immediately generated.
According to the bending-resistant copper wire bundle-wound shielding smooth special aluminum alloy sheath energy-saving environment-friendly ultrahigh-voltage cable which is designed and researched by the department, measures such as increasing loose-wound copper wires, adopting special 8XXX series aluminum alloy materials with better conductivity, and forming air gaps between the reducing compression buffer layer and the metal protective layer are adopted, so that the electrical connection between the outer shield and the metal shield and between the outer shield and the metal sheath is tighter, a good surface contact is formed, and the industrial problems are solved.
Meanwhile, the design reduces the eddy current loss in the electrified operation of the cable, and plays a role in energy conservation. The cable has smaller outer diameter, lighter weight and lower cost, and the length of the tray can be improved by about 10 percent. After the metal sheath is thinned, the bending performance of the cable is more excellent. After the metal sheath anti-corrosion layer and the outer semi-conductive layer of the outer sheath are made of the more environment-friendly hot melt adhesive and the extruded polyethylene semi-conductive layer, the cable is more in line with the concept of environment protection.
SUMMERY OF THE UTILITY MODEL
The utility model mainly solves the problem of outer screen burning in the use of the ultrahigh voltage cable in recent years through the process improvement among the metal shield, the insulation wire core semi-conductive buffer layer and the metal sleeve, and solves the problems of large outer diameter, small bending radius and the like of the corrugated aluminum sheath cable. Compared with the common smooth aluminum sheath, the aluminum sheath is more energy-saving and environment-friendly, and has smaller outer diameter and lighter weight.
1. And a sparse winding copper wire is additionally arranged outside the external shield of the insulated wire core.
2. Compared with a common smooth aluminum sheath, the thickness of the metal sheath is reduced, and the special 8XXX series aluminum alloy material with higher conductivity and higher mechanical strength is adopted.
3. An air gap is formed between the compression buffer layer and the metal protective layer through the diameter reducing device.
The utility model is realized by the following technical scheme:
the conductor is a split copper conductor which is stranded and compressed into a cable in a 5+1 corrugated structure; the conductor lapping shield is a semi-conductive nylon tape lapping; the conductor extruded shield is an extruded semiconductive shield layer; the insulation is an extruded insulation layer made of an ultrapurified crosslinked polyethylene material; the insulation shield is an extruded semiconductive shield layer; the semi-conductive buffer layer a is formed by lapping a semi-conductive buffer water-blocking tape in an overlapping manner; the metal shield is a copper wire monofilament sparse winding shield; the semi-conductive buffer layer b is formed by lapping a semi-conductive buffer water-blocking tape in an overlapping way; the metal sheath is a smooth sleeve which is welded with 8XXX series special aluminum alloy belts by argon arc welding and is coated with a cable core by reducing diameter; the anti-corrosion layer is a hot melt adhesive coating; the outer sheath is a high-density polyethylene outer sheath; the semiconducting layer is an extruded polyethylene outer semiconducting layer.
The conductor is a compressed conductor group consisting of 5 corrugated twisted compressed strand blocks and 1 round twisted compressed conductorThe cabling direction of the formed split conductor is right, and the structure is that the specification of the conductor is 800mm2-2500mm2Is adopted to solve the problem that the cross section of the conductor is 800mm2And the skin effect and proximity effect loss generated in the electric energy transmission process after the section is enlarged.
The conductor wrapping shield is formed by wrapping a semi-conductive nylon tape so as to ensure that the extruded semi-conductive shielding material is not extruded into a gap between the conductors when the three layers are co-extruded.
The conductor extruded shield is an extruded semi-conductive shield layer which is made of a semi-conductive shield material and is used for homogenizing the electric field intensity.
The insulation is an extruded insulation layer made of an ultrapurified crosslinked polyethylene material; the material of the layer is an ultra-clean cross-linked polyethylene material, and plays a main insulation role in high-voltage power transmission.
The insulation shield is an extruded semi-conductive shield layer, and the material of the insulation shield layer is a semi-conductive shield material and is used for homogenizing the electric field intensity.
The semi-conductive buffer layer a is formed by lapping a semi-conductive buffer water-blocking tape in an overlapping manner; the buffer copper wire is loosely wound and coated on the cable core to protect the cable core and ensure the electrical communication between the insulated wire core and the metal shield, and the buffer water blocking tape expands with water to form an effect that water does not go to the deep part of the cable after the circuit is broken once a certain part of the cable is subjected to water inlet (namely, the longitudinal water blocking effect).
The metal shield is a copper wire monofilament sparse winding shield; the layer and the metal sheath conduct fault current, leakage current and charging current of a cable system together and protect harmful contact voltage.
The semi-conductive buffer layer b is formed by lapping a semi-conductive buffer water-blocking tape in an overlapping way; the waterproof cable is used for coating the metal shield, so that the electrical communication between the metal shield and the metal sheath is ensured, and the waterproof cable also has the function that once the water enters a certain position of the cable, the buffering waterproof tape expands with water to form an open circuit, and then the water can not move towards the deep part of the cable (namely the longitudinal waterproof function).
The metal sheath (9) is a smooth sleeve which is welded with 8XXX series special aluminum alloy belts by argon arc welding and is coated with a cable core by reducing diameter; annealing 8XXX series special aluminum alloy belt in an annealing furnace at 500 deg.C for 10 hr to make it softer, cutting the belt and longitudinally wrapping the cable core, argon protection welding and sealing, rolling by special four-wheel active diameter reducing device to make the aluminum alloy sheath more tightly fit to the gap between the cable core compression metal sheath and the semi-conductive buffer water-blocking belt, and finishing the process after the smooth aluminum alloy sheath and the cable core form an integral structure. The metal sleeve is used as an ultra-high voltage cable armor layer for mechanically protecting the internal structure of the cable; the metal shielding is communicated with the cable system, the fault current, the leakage current and the charging current of the cable system are conducted together, and the harmful contact voltage is protected to play an electric protection role.
The anti-corrosion layer is a hot melt adhesive coating; extruding a hot melt adhesive melt by a plastic extruding machine, spraying the hot melt adhesive on a smooth aluminum alloy sheath with a cable core by a specially designed spraying device, and after traction and wiring, feeding the semi-finished product into a uniform die for uniformly smearing the hot melt adhesive; compared with the traditional asphalt for the cable made of the anticorrosive material, the thermosol coating is more environment-friendly and pollution-free, and also plays a role in closely adhering the metal protective layer with the outer sheath layer, otherwise, under the condition of no outer sheath layer protection, the metal protective layer is bent to generate folds and deformation.
The oversheath is high density polyethylene oversheath, and contrast PVC sheath mechanical strength is higher, is difficult for being scratched outer sheath by external force when guaranteeing cable laying installation.
The semi-conducting layer is for extruding the outer semi-conducting layer of polyethylene, and outer semi-conducting layer is as experimental electrode, and the graphite coating of contrast tradition has more even, smooth, firm, the advantage that does not fall off, lays with firm cladding on the insulating oversheath under the long-term service condition more, no matter production, lay, use the in-process of this cable all avoided the unrestrained of graphite coating powder, environmental protection more.
Compared with the prior art, the utility model brings beneficial technical effects as follows:
1. the outer screen burning and other technical problems of the corrugated aluminum sheath ultra-high voltage cable in use in recent years are solved.
2. And simultaneously, the problems of large outer diameter, small bending radius and the like of the corrugated aluminum sheath cable are solved.
3. Compared with the common smooth aluminum sheath, the aluminum sheath is more energy-saving and environment-friendly, and has smaller outer diameter and lighter weight.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention.
Reference numeral 1: 1. conductor, 2, conductor are around package shielding, 3, conductor extrusion shielding, 4, insulation, 5, insulation shielding, 6, semiconduction buffer layer a, 7, metal shielding, 8, semiconduction buffer layer b, 9, metal sheath layer, 10, anticorrosive coating, 11, oversheath, 12, semiconduction layer.
Detailed Description
Example 1
As a preferred embodiment of the present invention, refer to the attached FIG. 1:
the conductor is a split copper conductor which is stranded and compressed into a cable in a 5+1 corrugated structure; the conductor lapping shield is a semi-conductive nylon tape lapping; the conductor extruded shield is an extruded semiconductive shield layer; the insulation is an extruded insulation layer made of an ultrapurified crosslinked polyethylene material; the insulation shield is an extruded semiconductive shield layer; the semi-conductive buffer layer a is formed by lapping a semi-conductive buffer water-blocking tape in an overlapping manner; the metal shield is a copper wire monofilament sparse winding shield; the semi-conductive buffer layer b is formed by lapping a semi-conductive buffer water-blocking tape in an overlapping way; the metal sheath is a smooth sleeve which is welded with 8XXX series special aluminum alloy belts by argon arc welding and is coated with a cable core by reducing diameter; the anti-corrosion layer is a hot melt adhesive coating; the outer sheath is a high-density polyethylene outer sheath; the semiconducting layer is an extruded polyethylene outer semiconducting layer.
Example 2
As another preferred embodiment of the utility model, refer to the attached FIG. 1:
the conductor is a split copper conductor which is stranded and compressed into a cable in a 5+1 corrugated structure; the conductor lapping shield is a semi-conductive nylon tape lapping; the conductor extruded shield is an extruded semiconductive shield layer; the insulation is an extruded insulation layer made of an ultrapurified crosslinked polyethylene material; the insulation shield is an extruded semiconductive shield layer; the tinned copper wire braided semiconductive buffer layer is formed by braiding a layer of tinned copper wire in the middle of a semiconductive buffer water blocking tape with double faces blocking water, so that a better electric connection and conduction effect is achieved, the double layers of tinned copper wire braided semiconductive buffer tapes are overlapped and wrapped on the insulating wire core outer shield, and the insulating wire core outer shield, the buffer layer and the metal sheath layer can be conducted well; the metal sheath is a smooth sleeve which is welded with 8XXX series special aluminum alloy belts by argon arc welding and is coated with a cable core by reducing diameter; the anti-corrosion layer is a hot melt adhesive coating; the outer sheath is a high-density polyethylene outer sheath; the semiconducting layer is an extruded polyethylene outer semiconducting layer.

Claims (12)

1. A smooth special aluminum alloy sheath energy-saving environment-friendly ultrahigh-voltage cable is characterized by comprising a conductor (1), therefore, the outer side of the conductor (1) is wrapped with the conductor wrapping shield (2), the outer side of the conductor wrapping shield (2) is wrapped with the conductor extrusion shield (3), the outer side of the conductor extrusion shield (3) is provided with an insulation (4), the outer side of the insulation (4) is wrapped with an insulation shield (5), the outer side of the insulation shield (5) is wrapped with a semi-conductive buffer layer a (6), the outer side of the semi-conductive buffer layer a (6) is provided with a metal shield (7), the outer side of the metal shield (7) is wrapped with a semi-conductive buffer layer b (8), the outer side of the semi-conductive buffer layer b (8) is wrapped with a metal sheath (9), the outer side of the metal sheath (9) is provided with an anticorrosive layer (10), the outer side of the anticorrosive layer (10) is provided with an outer sheath (11), and the outer side of the outer sheath (11) is provided with a semi-conducting layer (12).
2. The smooth special aluminum alloy sheath energy-saving environment-friendly ultrahigh-voltage cable as claimed in claim 1, characterized in that: the conductor (1) is a split copper conductor which is stranded and compressed into a cable in a 5+1 corrugated structure.
3. The smooth special aluminum alloy sheath energy-saving environment-friendly ultrahigh-voltage cable as claimed in claim 1, characterized in that: the conductor lapping shield (2) is formed by lapping a semi-conductive nylon tape.
4. The smooth special aluminum alloy sheath energy-saving environment-friendly ultrahigh-voltage cable as claimed in claim 1, characterized in that: the conductor extruded shield (3) is an extruded semiconducting shield layer.
5. The smooth special aluminum alloy sheath energy-saving environment-friendly ultrahigh-voltage cable as claimed in claim 1, characterized in that: the insulation layer (4) is an extruded insulation layer made of an ultra-clean cross-linked polyethylene material; the insulation shield (5) is an extruded semiconducting shield layer.
6. The smooth special aluminum alloy sheath energy-saving environment-friendly ultrahigh-voltage cable as claimed in claim 1, characterized in that: and the semi-conductive buffer layer a (6) is formed by overlapping and wrapping a semi-conductive buffer water-blocking tape.
7. The smooth special aluminum alloy sheath energy-saving environment-friendly ultrahigh-voltage cable as claimed in claim 1, characterized in that: the metal shield (7) is a copper wire monofilament sparse winding shield.
8. The smooth special aluminum alloy sheath energy-saving environment-friendly ultrahigh-voltage cable as claimed in claim 1, characterized in that: and the semi-conductive buffer layer b (8) is formed by overlapping and wrapping a semi-conductive buffer water-blocking tape.
9. The smooth special aluminum alloy sheath energy-saving environment-friendly ultrahigh-voltage cable as claimed in claim 1, characterized in that: the metal sheath (9) is a flat sliding sleeve which is welded with 8XXX series special aluminum alloy belts by argon arc welding and then is shrunk and coated with a cable core.
10. The smooth special aluminum alloy sheath energy-saving environment-friendly ultrahigh-voltage cable as claimed in claim 1, characterized in that: the anticorrosive coating (10) is a hot melt adhesive coating.
11. The smooth special aluminum alloy sheath energy-saving environment-friendly ultrahigh-voltage cable as claimed in claim 1, characterized in that: the outer sheath (11) is a high-density polyethylene outer sheath.
12. The smooth special aluminum alloy sheath energy-saving environment-friendly ultrahigh-voltage cable as claimed in claim 1, characterized in that: the semiconducting layer (12) is an extruded polyethylene outer semiconducting layer.
CN202122766944.8U 2021-11-12 2021-11-12 Energy-saving environment-friendly ultra-high voltage cable with smooth special aluminum alloy sheath Active CN216311386U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202122766944.8U CN216311386U (en) 2021-11-12 2021-11-12 Energy-saving environment-friendly ultra-high voltage cable with smooth special aluminum alloy sheath

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202122766944.8U CN216311386U (en) 2021-11-12 2021-11-12 Energy-saving environment-friendly ultra-high voltage cable with smooth special aluminum alloy sheath

Publications (1)

Publication Number Publication Date
CN216311386U true CN216311386U (en) 2022-04-15

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Country Status (1)

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CN (1) CN216311386U (en)

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