CN112017819A - Electrical contact water-blocking type high-voltage power cable - Google Patents
Electrical contact water-blocking type high-voltage power cable Download PDFInfo
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- CN112017819A CN112017819A CN202010901788.9A CN202010901788A CN112017819A CN 112017819 A CN112017819 A CN 112017819A CN 202010901788 A CN202010901788 A CN 202010901788A CN 112017819 A CN112017819 A CN 112017819A
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- layer
- water
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- blocking
- voltage power
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
- H01B7/2825—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable using a water impermeable sheath
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
- H01B9/027—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of semi-conducting layers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
Abstract
The invention discloses an electric contact water-blocking type high-voltage power cable which comprises a conductor, wherein a conductor shielding layer is wound outside the conductor, an insulating layer and an insulating shielding layer are sequentially extruded outside the conductor shielding layer, a buffering water-blocking layer is wound outside the insulating shielding layer, a corrugated metal sleeve layer is wrapped outside the buffering water-blocking layer, an outer sheath layer is further extruded outside the metal sleeve layer, a semi-conducting layer is extruded or coated outside the outer sheath layer, a negative gap is formed between the inner diameter of the metal sleeve layer and the buffering water-blocking layer, and the gap value is-2.5 mm to-2 mm. The invention has excellent contact property and good water-blocking performance so as to improve the water-blocking performance and the electrical performance of the cable.
Description
Technical Field
The invention relates to a high-voltage power cable, in particular to an electrical contact water-blocking high-voltage power cable.
Background
Along with the large-scale application of crosslinked cables in China, during the laying and operation of high-voltage power cables, when mechanical stress or external force causes cable sheaths and insulation damage, moisture or water can invade along the longitudinal and radial gaps of the cables, so that the probability of generating water branches at the operating voltage of the high-voltage power cable insulation is rapidly increased, the water branches grow to a certain length, permanent electrical branch defects can be caused at the tips of the water branches, the insulation breakdown of the cables can be caused in a short time, and power failure accidents are caused. The incidence of insulating water tree degradation and resulting cable breakdown due to the intrusion of ambient moisture into the interior of the cable has increased year by year.
Meanwhile, in the high-voltage power cable with the metal sheath structure, due to the problem of gap control between the metal sheath and the insulation, more and more fault-free breakdown situations occur in recent years. In 2019, a report is given by a national network equipment part in 4 months, ablation faults of a water-blocking buffer layer of the high-voltage cable occur 24 times in the range from 2010 to 2019, ablation defects of the water-blocking buffer layer are found 9 times in a passive mode during line switching, and for the high-voltage cable with the single water-blocking buffer layer structure, the main reasons of the faults are that the water-blocking buffer layer is in poor contact with a corrugated aluminum sheath, the volume resistivity of the water-blocking buffer layer exceeds the standard, electrochemical corrosion and the like cause ablation of the water-blocking buffer layer, so that faults of a cable body.
Therefore, those skilled in the art are devoted to develop an electrically-contacted water-blocking high-voltage power cable, so that the high-voltage power cable has excellent contact and good water-blocking performance, thereby improving the water-blocking performance and electrical performance of the cable.
Disclosure of Invention
In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide an electrical contact water-blocking type high-voltage power cable, so that the high-voltage power cable has excellent contact and water-blocking performance, thereby improving the water-blocking performance and electrical performance of the cable.
In order to achieve the purpose, the invention provides an electric contact water-blocking type high-voltage power cable which comprises a conductor, wherein a conductor shielding layer is wound outside the conductor, an insulating layer and an insulating shielding layer are sequentially extruded outside the conductor shielding layer, a buffer water-blocking layer is wound outside the insulating shielding layer, a corrugated metal sleeve layer is wrapped outside the buffer water-blocking layer, an outer sheath layer is further extruded outside the metal sleeve layer, a semi-conducting layer is extruded or coated outside the outer sheath, a negative gap is formed between the inner diameter of the metal sleeve layer and the buffer water-blocking layer, and the gap value is-2.5 mm to-2 mm. The metal jacket layer is internally provided with the buffering water-blocking layer, so that the metal jacket layer is prevented from extruding to damage the insulating layer, and meanwhile, the buffering water-blocking layer can effectively prevent water from permeating, thereby improving the safe operation quality and prolonging the service life.
Further, the conductor includes a central conductor and a plurality of segmented segment conductor strands distributed around the periphery of the central conductor. The conductor comprises a plurality of segmented fan-shaped conductor strand blocks, and the flexibility of the cable can be improved.
Furthermore, the buffering and water-blocking layer is formed by overlapping a plurality of layers, the wrapping and covering rate of the buffering and water-blocking layer is more than 35%, and the thickness of the buffering and water-blocking layer is more than 1.8 mm. The buffering water-blocking layer adopts multilayer overlapping wrapping, so that effective and comprehensive contact with the inner wall of the metal sleeve can be further improved, and the water-blocking effect is improved.
Furthermore, the volume resistivity of the buffer water-resistant layer is less than 500 omega-m, and the surface resistivity is less than 350 omega-m.
Further, the conductor shielding layer is arranged between the conductor and the insulating layer. The conductor shielding layer is mainly used for homogenizing the electric field intensity and avoiding discharge breakdown caused by field intensity concentration and dispersion unevenness.
Furthermore, the conductor shielding layer is a wrapped semi-conducting layer and an extruded semi-conducting layer, and the volume resistivity of the conductor shielding layer is less than 500 omega-m.
Furthermore, an insulating shielding layer is arranged between the insulating layer and the buffer water-resistant layer. The insulating shield layer is mainly used for homogenizing the electric field strength.
Further, the outer sheath layer also comprises the semi-conducting layer. The semiconducting layer is used to equalize the electric field.
Further, the volume resistivity of the outer sheath layer is larger than 10 multiplied by 1012Ω·m。
Furthermore, the buffering and water-blocking layer is made of semiconductive fluffy cotton and semiconductive non-woven fabric type materials.
The invention has the beneficial effects that: the corrugated metal sleeve layer and the buffering water-blocking layer in negative clearance fit with the metal sleeve layer are adopted, so that the cable has good water-blocking performance; the buffering water-resistant layer adopts multilayer overlapping wrapping, so that the water-resistant performance of the cable is further improved; still be provided with conductor shield layer and insulation shield layer in the high tension cable, effectual homogenization electric field intensity of ability reduces the interference of external environment to the cable, improves the safe operating quality and the life of cable.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of another embodiment of the present invention.
Fig. 3 is a schematic cross-sectional view at a in fig. 1 according to the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples, wherein the terms "upper", "lower", "left", "right", "inner", "outer", and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular manner, and thus should not be construed as limiting the present invention. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "in communication" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 to 3, an electrical contact water-blocking type high-voltage power cable comprises a conductor 1, wherein the conductor 1 can be made of copper or aluminum, in one embodiment, the conductor 1 comprises a middle conductor 101 and a plurality of segmented fan-shaped conductor strand blocks distributed on the periphery of the middle conductor 102, and the size and the cross section of the conductor 1 can be designed according to requirements.
The conductor 1 is wrapped in proper order outward and has insulating layer 3 and buffering water-blocking layer 5, is provided with conductor shielding layer 2 between conductor 1 and the insulating layer 3, and conductor shielding layer 2 is for wrapping semi-conductive layer and crowded package semi-conductive layer, and the material is semi-conductive band and semi-conductive XLPE or other plastics that satisfy the performance requirement respectively, and the semi-conductive band passes through to wrap, plastics pass through crowded package both and form conductor shielding layer 2 jointly, and the volume resistivity of conductor shielding layer 2 is less than 500 omega m, and the main function is exactly homogenization magnetic field intensity.
The insulating layer 3 can be made of cross-linked polyethylene, ethylene propylene rubber or polypropylene, the withstand voltage grade of the insulating material is selected according to design requirements, and the structural size of the insulating layer 3 is designed according to the voltage grade and corresponding requirements.
The buffering and water-blocking layer 5 is a multi-layer overlapping wrapping, in the embodiment, the buffering and water-blocking layer 5 is made of semi-conductive fluffy cotton, water-blocking powder and semi-conductive non-woven fabric type materials, the wrapping and covering rate is larger than 35%, the thickness of the single-layer buffering and water-blocking layer 5 is larger than 1.8mm, the volume resistivity of the buffering and water-blocking layer 5 is smaller than 500 omega.m, and the surface resistivity is smaller than 350 omega.m. The buffering and water-blocking layer 5 cannot adopt a metal wire shielding type water-blocking tape and gold cloth, and because the two materials are influenced by the addition of copper wires, the buffering is limited, and the effect is poor. In this implementation, buffering water-blocking layer 5 design production technology should be three-layer around the package, and its face must be leveled around the package, and the unilateral thickness of buffer layer should be greater than 7.5mm after the package, and the water-blocking material that simultaneously buffering water-blocking layer 5 added can meet water rapid expansion, and its water absorption performance is 20 times of its volume, can prevent moisture infiltration rapidly.
An insulation shielding layer 4 is arranged between the insulation layer 3 and the buffer water-resistant layer 5, and the insulation shielding layer 4 is made of semi-conductive XLPE or other semi-conductive plastics meeting performance requirements. The buffering water-resistant layer 5 is wrapped with a corrugated metal sleeve layer 6, a negative gap is formed between the inner diameter of the metal sleeve layer 6 and the buffering water-resistant layer 5, and the gap value is-2.5 mm to-2 mm, so that the cable with a large section and a high voltage level is ensured to have good enough bending performance. The inner diameter of the trough of the metal sleeve layer 6 and the buffering water-blocking layer 5 are in negative gap contact and cannot be too small, otherwise the metal sleeve layer 6 can damage an insulating wire core when being embossed, the too large gap control can lead the wave crest of the corrugated aluminum sleeve to be filled, and the gap problem still exists. The metal sleeve 6 is made of aluminum or copper material, and the thickness of the metal sleeve is designed according to standards or requirements.
An outer sheath layer 7 is also wound outside the metal sheath layer 6, and the volume resistivity of the outer sheath layer 7 is more than 10 multiplied by 1012Omega.m, the outer sheath 7 is made of PE or PVC material which can increase the functions of flame retardance, rat and termite resistance and the like, and is selected according to the laying environment and the requirements of customers.
The outer sheath layer 7 also comprises a semi-conducting layer 8, the semi-conducting layer 8 is made of semi-conducting carbon black or extruded semi-conducting PE or extruded semi-conducting PVC materials, the outer semi-conducting layer is used as an outer semi-conducting electrode of the outer sheath, the outer semi-conducting layer must be tightly attached to the outer sheath layer 7, and the situations that the semi-conducting layer 8 falls off due to external friction and the like cannot occur.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (7)
1. The utility model provides an electric contact waterproofing type high voltage power cable which characterized by: the cable comprises a conductor (1), wherein a conductor shielding layer (2) is wound and wrapped outside the conductor (1), an insulating layer (3) and an insulating shielding layer (4) are sequentially extruded and wrapped outside the conductor shielding layer (2), a buffering water-blocking layer (5) is wound and wrapped outside the insulating shielding layer (4), a corrugated metal sleeve layer (6) is wrapped outside the buffering water-blocking layer (5), an outer sheath layer (7) is further extruded and wrapped outside the metal sleeve layer (6), and a semi-conducting layer (8) is extruded and wrapped outside the outer sheath (7);
and a negative clearance is formed between the inner diameter of the metal sleeve layer (6) and the buffer water-resistant layer (5), and the clearance value is-2.5 mm to-2 mm.
2. The electrical contact water-blocking high voltage power cable of claim 1, wherein: the conductor (1) comprises a middle conductor (101) and a plurality of segmented fan-shaped conductor strand blocks (102) distributed on the periphery of the middle conductor (101).
3. An electrical contact water-blocking high-voltage power cable according to claim 1 or 2, characterized in that: buffer water-resistant layer (5) are the multilayer overlapping and wrap, and its lapping rate of taking is greater than 35%, and the individual layer the thickness of buffer water-resistant layer (5) is greater than 1.8 mm.
4. The electrical contact water-blocking high voltage power cable of claim 3, wherein: the volume resistivity of the buffer water-resistant layer (5) is less than 500 omega-m, and the surface resistivity is less than 350 omega-m.
5. The electrical contact water-blocking high voltage power cable of claim 3, wherein: the conductor shielding layer (2) is a wrapped semi-conducting layer and an extruded semi-conducting layer, and the volume resistivity of the conductor shielding layer (2) is less than 500 omega-m.
6. The electrical contact water-blocking high voltage power cable of claim 5, wherein: the volume resistivity of the outer sheath layer (7) is more than 10 multiplied by 1012Ω·m。
7. The electrical contact water-blocking high voltage power cable of claim 4, wherein: the buffer water-resistant layer (5) is made of semiconductive fluffy cotton and semiconductive non-woven fabric type materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010901788.9A CN112017819A (en) | 2020-09-01 | 2020-09-01 | Electrical contact water-blocking type high-voltage power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010901788.9A CN112017819A (en) | 2020-09-01 | 2020-09-01 | Electrical contact water-blocking type high-voltage power cable |
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| Publication Number | Publication Date |
|---|---|
| CN112017819A true CN112017819A (en) | 2020-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010901788.9A Pending CN112017819A (en) | 2020-09-01 | 2020-09-01 | Electrical contact water-blocking type high-voltage power cable |
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| Country | Link |
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| CN (1) | CN112017819A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114334232A (en) * | 2021-12-20 | 2022-04-12 | 杭州电缆股份有限公司 | Novel semi-conductive non-water-blocking buffer layer high-voltage power cable |
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| CN209657869U (en) * | 2019-05-22 | 2019-11-19 | 中天科技海缆有限公司 | High-tension cable |
| CN209880182U (en) * | 2019-06-21 | 2019-12-31 | 江苏珠影特种电缆有限公司 | Cross-linked polyethylene insulated polyvinyl chloride sheath water-blocking power cable |
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2020
- 2020-09-01 CN CN202010901788.9A patent/CN112017819A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160336097A1 (en) * | 2015-05-11 | 2016-11-17 | Sumitomo Wiring Systems, Ltd. | Electrical wire protection member |
| CN106143354A (en) * | 2015-05-11 | 2016-11-23 | 住友电装株式会社 | Wire protective parts |
| CN205722977U (en) * | 2016-06-06 | 2016-11-23 | 天津邦新翔科技有限公司 | A kind of high shielding holding wire |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114334232A (en) * | 2021-12-20 | 2022-04-12 | 杭州电缆股份有限公司 | Novel semi-conductive non-water-blocking buffer layer high-voltage power cable |
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