CN112466513B - Flexible direct current insulation power cable of 535kV superhigh pressure - Google Patents
Flexible direct current insulation power cable of 535kV superhigh pressure Download PDFInfo
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- CN112466513B CN112466513B CN202011202470.8A CN202011202470A CN112466513B CN 112466513 B CN112466513 B CN 112466513B CN 202011202470 A CN202011202470 A CN 202011202470A CN 112466513 B CN112466513 B CN 112466513B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
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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
- H01B7/02—Disposition of insulation
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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
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
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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
- H01B7/2806—Protection against damage caused by corrosion
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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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Abstract
The invention discloses a +/-535 kV ultrahigh-voltage flexible direct-current light polypropylene insulated power cable, wherein a semiconductive water-blocking layer is arranged outside a direct-current unit, a metal armor layer is arranged outside the semiconductive water-blocking layer, an anticorrosive layer is arranged outside the metal armor layer, an outer protective layer is arranged outside the anticorrosive layer, a semiconductive layer is arranged outside the outer protective layer, the direct-current unit comprises a water-blocking conductor layer, a semiconductive super-heavy belt, an inner shielding layer, an insulating layer and an insulating shielding layer which are sequentially arranged from inside to outside, the insulating layer is modified polypropylene, and the inner shielding layer and the insulating shielding layer are made of direct-current shielding materials; the production method has the advantages that the weight of the crosslinked polyethylene power cable is reduced by 26 percent, the long-term working temperature is not lower than 110 ℃, the extrusion molding of common plastics is realized, the extrusion linear velocity is faster, no scorched object is generated, the continuous production can be realized, the continuous production with large length and no joint can be realized, the production efficiency is high, and the process is simple; has better mechanical property, electrical property and insulating strength.
Description
Technical Field
The invention relates to a power cable, in particular to a +/-535 kV ultrahigh-voltage flexible direct-current insulated power cable.
Background
With the continuous strengthening of the state in the field of intelligent power grid integration, the ultrahigh-voltage flexible direct-current power cable is led to come into wide market opportunity. The flexible direct current transmission technology has strong technical advantages for improving the dynamic stability of an alternating current system, increasing the dynamic reactive power reserve of the system, improving the electric energy quality of the alternating current system, solving the problems caused by nonlinear load and impact load and the like, and is also an important technical means for solving the problem of large-capacity, long-distance and intermittent new energy power generation grid connection in the construction of a smart grid.
The cable insulation material in use at present generally adopts polyethylene resin as a base material, the working temperature is generally below 70 ℃, and the electrical performance is limited, so the cable insulation material is generally applied to medium and low voltage cables. In order to further increase the operating temperature and operating voltage of the insulating material, the polyethylene is crosslinked to produce crosslinked polyethylene. The crosslinked polyethylene has good thermal property and mechanical property, and can endure high working temperature and electric field intensity. However, crosslinked polyethylene is a thermosetting material, cannot be recycled after the service life is over, and is difficult to degrade, crosslinked byproducts are not easy to remove, the control difficulty of the purity of the cable is high, and devices in the steps of crosslinking, degassing and the like occupy large space, consume much energy and have low efficiency. In addition, the crosslinked polyethylene has thermosetting property, the cable is difficult to recycle after reaching the service life, and only can be incinerated or subjected to waste crushing and landfill treatment, so that the environmental protection pressure is huge, and the environmental pollution is easily caused. The traditional crosslinked polyethylene insulation brings great threats to energy waste and environmental pollution due to the fact that the traditional crosslinked polyethylene insulation cannot be recycled, does not conform to the current resource application concept of international sustainable development, and brings great inconvenience to construction and transportation due to the fact that the specific gravity of the crosslinked polyethylene is larger by about 0.94g/cm3 and the weight of the cable is increased invisibly; based on the current situation of the domestic and foreign industries, the method brings a wide development opportunity for the ultrahigh-voltage flexible direct-current polypropylene insulated power cable.
Disclosure of Invention
The invention aims to solve the technical problem of providing a +/-535 kV ultrahigh voltage flexible direct current insulated power cable which is light in weight, high temperature resistant, green, environment-friendly and recyclable.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a light-duty polypropylene insulation power cable of 535kV superhigh pressure flexible direct current, includes direct current unit, direct current unit be provided with the semiconduction water-blocking layer outward, the semiconduction water-blocking layer be provided with the metal armor outward, the metal armor be provided with the anticorrosive coating outward, the anticorrosive coating be provided with the outer jacket outward, the outer jacket be provided with the semiconduction layer outward, direct current unit include the conductive layer that blocks water, the semiconduction that set gradually from inside to outside specially many tangential belt, internal shield layer, insulating layer and insulation shielding layer, the material of insulating layer be modified polypropylene, the material of internal shield layer and insulation shielding layer be direct current shielding material.
Further, the modified polypropylene is prepared from the following raw materials in parts by mass: 60-105 parts of polypropylene, 0.8-1.5 parts of nano organic modified montmorillonite, 10-15 parts of calcium stearate, 0.2-0.8 part of Acetophenone (AP), 8-16 parts of sodium carboxymethylcellulose, 0.8-1.0 part of rutile type nano silicon dioxide, 0.8-1.2 parts of wood fiber, 0.2-0.6 part of shrinkage uniformity additive, 0.1-0.5 part of synergistic antioxidant and 0.8-1.2 parts of nano reinforcing agent.
In the structure, the synergistic antioxidant is used for prolonging the service life of the polymer, Acetophenone (AP) is a voltage stabilizer, the breakdown field strength of the polypropylene PP insulating material can be obviously improved, the aging resistance is improved, the mechanical bending property of polypropylene can be effectively improved by calcium stearate, the ultraviolet shielding capability is improved by rutile type nano silicon dioxide (SiO 2), the aging resistance can be obviously improved by the combined use of nano silicon dioxide (SiO 2), Acetophenone (AP) and calcium stearate, the formation of space charge is inhibited, the growth of electric tree branches is hindered, and the breakdown strength of the polymer is improved; the added wood fiber and the montmorillonite are compounded to generate the effect, so that the tensile strength, the bending strength and the heat conducting property can be obviously improved, and simultaneously, a large amount of grade A cellulose is contained, so that the flexibility of the insulating layer is ensured; the shrinkage uniformity additive reduces the shrinkage rate of polypropylene; the nano-reinforcing agent enhances curing at low temperatures.
Further, the synergistic antioxidant comprises a main antioxidant and an auxiliary antioxidant, wherein the main antioxidant is 4,4' -thiobis (6-tert-butyl-3-methylphenol), the auxiliary antioxidant is tris [ 2.4-di-tert-butylphenyl ] phosphite and polyaromatic hydrocarbon, and the weight ratio of the main antioxidant to the auxiliary antioxidant is 1: 0.2-1.1. In the structure, the modified auxiliary materials can be better combined with each other, and the service life of the polymer is prolonged.
Further, the nano reinforcing agent is polyhedral oligomeric silsesquioxane (POSS) with the particle size of 1.2-1.6 nm. In the structure, the particle size can be better fused with other materials, and the harmful property of the polypropylene material caused by low-temperature curing is improved.
Furthermore, the particle size of the shrinkage uniformity additive is 0.75-95 μm, and the shrinkage uniformity additive is one or more of talcum powder, calcium carbonate and calcined argil.
Furthermore, the thickness of the insulating layer is 25-30 mm.
Further, the thickness of the insulating layer is 26 mm. The thickness of the insulating layer is greatly reduced.
Furthermore, the water blocking conductor layer is combined with the trapezoidal conductor in a round compressed mode in the shape of a cross section.
Compared with the prior art, the invention has the advantages that the invention discloses the +/-535 kV ultrahigh-voltage flexible direct-current light-weight polypropylene insulated power cable, the insulation thickness of the modified polypropylene insulation layer is reduced, the specific gravity of the modified polypropylene is 0.91g/cm3, the weight of the polypropylene insulated power cable can be reduced by 26% compared with that of a crosslinked polyethylene power cable, and the consumption of the whole raw materials of the cable is greatly reduced;
in addition, the insulation process does not need to carry out crosslinking, only needs general plastic extrusion molding, has faster extrusion linear speed, does not generate scorched substances, can carry out continuous production, greatly reduces the shutdown cleaning times of the extruder, and has simple process; the method can realize continuous production with large length and no joint, has high production efficiency, does not generate crosslinking by-products, and does not need a degassing process; the environment-friendly energy-saving material can be recycled, is environment-friendly, and has good economic benefit, social benefit and wide market development space;
the long-term working temperature is not lower than 100 ℃, which is 10 ℃ higher than the long-term stable working temperature of the cross-linked power cable, so that the polypropylene has higher working temperature relative to the polyethylene;
the short-time overload capacity is strong, the safety reliability and the operation stability of the ultrahigh-voltage power cable are greatly improved, and compared with crosslinked polyethylene, the ultrahigh-voltage power cable has better mechanical property, electrical property, insulating strength, heat resistance and the like.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The first embodiment is as follows: as shown in fig. 1, a light-duty polypropylene insulated power cable of flexible direct current of 535kV superhigh voltage, includes a direct current unit, a semiconductive water-blocking layer 1 is provided outside the direct current unit, a metal armor layer 2 is provided outside the semiconductive water-blocking layer 1, an anticorrosive coating 3 is provided outside the metal armor layer 2, an outer protective coating 4 is provided outside the anticorrosive coating 3, a semiconductive layer 5 is provided outside the outer protective coating 4, the direct current unit includes a water-blocking conductor layer 6, a semiconductive teflon tape 7, an inner shield layer 8, an insulating layer 9 and an insulating shield layer 10 which are sequentially provided from inside to outside, the material of the insulating layer 9 is modified polypropylene, and the material of the inner shield layer 8 and the insulating shield layer 10 is direct current shield material. The thickness of the insulating layer 9 is 25-30mm, and the preferred thickness of the insulating layer 9 is 26 mm. The water-blocking conductor layer 6 is formed by combining a pressing step type conductor with a circular cross section. The direct current shielding material is an existing material.
In this particular example, the modified polypropylene (OCPP) was prepared from the following raw materials in parts by mass: 60 parts of polypropylene, 0.8 part of nano organically modified montmorillonite, 10 parts of calcium stearate, 0.2 part of Acetophenone (AP), 8 parts of sodium carboxymethylcellulose, 0.8 part of rutile type nano silicon dioxide, 0.8 part of wood fiber, 0.2 part of uniform shrinkage additive, 0.1 part of synergistic antioxidant and 0.8 part of nano reinforcing agent.
In this embodiment, the synergistic antioxidant comprises a primary antioxidant and a secondary antioxidant, wherein the primary antioxidant is 4,4' -thiobis (6-tert-butyl-3-methylphenol), the secondary antioxidant is tris [ 2.4-di-tert-butylphenyl ] phosphite or polyaromatic hydrocarbon, and the weight ratio of the primary antioxidant to the secondary antioxidant is 1: 0.2.
In this particular example, the nanoreinforcement is a polyhedral oligomeric silsesquioxane (POSS) having a particle size of 1.2 nm.
In this embodiment, the shrinkage uniformity additive is one or more of talc, calcium carbonate, and calcined clay, and the particle size of the shrinkage uniformity additive is 0.75 μm.
Example two: the other steps are the same as the first embodiment, except that:
in this particular example, the modified polypropylene (OCPP) was prepared from the following raw materials in parts by mass: 85 parts of polypropylene, 1.2 parts of nano organically modified montmorillonite, 13 parts of calcium stearate, 0.5 part of Acetophenone (AP), 12 parts of sodium carboxymethylcellulose, 0.9 part of rutile type nano silicon dioxide, 1.1 part of wood fiber, 0.4 part of uniform shrinkage additive, 0.3 part of synergistic antioxidant and 1.0 part of nano reinforcing agent.
In this embodiment, the synergistic antioxidant comprises a primary antioxidant and a secondary antioxidant, the primary antioxidant is 4,4' -thiobis (6-tert-butyl-3-methylphenol), the secondary antioxidant is tris [ 2.4-di-tert-butylphenyl ] phosphite or polyaromatic hydrocarbon, and the weight ratio of the primary antioxidant to the secondary antioxidant is 1: 0.6.
In this particular example, the nanoreinforcement is a polyhedral oligomeric silsesquioxane (POSS) having a particle size of 1.4 nm.
In this embodiment, the shrinkage uniformity additive is one or more of talc, calcium carbonate, and calcined clay, and the particle size of the shrinkage uniformity additive is 0.85 μm.
Example three: the other steps are the same as the first embodiment, except that: the polypropylene is prepared from the following raw materials in parts by mass: 105 parts of polypropylene, 1.5 parts of nano organically modified montmorillonite, 15 parts of calcium stearate, 0.8 part of acetophenone, 16 parts of sodium carboxymethylcellulose, 1.0 part of rutile type nano silicon dioxide, 1.2 parts of wood fiber, 0.6 part of uniform shrinkage additive, 0.5 part of synergistic antioxidant and 1.2 parts of nano reinforcing agent.
In this embodiment, the synergistic antioxidant comprises a primary antioxidant and a secondary antioxidant, the primary antioxidant is 4,4' -thiobis (6-tert-butyl-3-methylphenol), the secondary antioxidant is tris [ 2.4-di-tert-butylphenyl ] phosphite or polyaromatic hydrocarbon, and the weight ratio of the primary antioxidant to the secondary antioxidant is 1: 1.1.
In this particular example, the nanoreinforcement is a polyhedral oligomeric silsesquioxane (POSS) having a particle size of 1.6 nm.
In this embodiment, the shrinkage uniformity additive is one or more of talc, calcium carbonate, and calcined clay, and has a particle size of about 0.95 μm.
Performance parameter comparison table
Note: various indexes of the modified OCPP.
Claims (5)
1. The +/-535 kV ultrahigh-voltage flexible direct-current light polypropylene insulated power cable is characterized by comprising a direct-current unit, wherein a semiconductive water-blocking layer is arranged outside the direct-current unit, a metal armor layer is arranged outside the semiconductive water-blocking layer, an anticorrosive layer is arranged outside the metal armor layer, an outer protective layer is arranged outside the anticorrosive layer, a semiconductive layer is arranged outside the outer protective layer, the direct-current unit comprises a water-blocking conductor layer, a semiconductive Teflon tape, an inner shielding layer, an insulating layer and an insulating shielding layer which are sequentially arranged from inside to outside, the insulating layer is made of modified polypropylene, and the inner shielding layer and the insulating shielding layer are made of direct-current shielding materials;
the modified polypropylene is prepared from the following raw materials in parts by mass: 60-105 parts of polypropylene, 0.8-1.5 parts of nano organic modified montmorillonite, 10-15 parts of calcium stearate, 0.2-0.8 part of acetophenone, 8-16 parts of sodium carboxymethylcellulose, 0.8-1.0 part of rutile type nano silicon dioxide, 0.8-1.2 parts of wood fiber, 0.2-0.6 part of uniform shrinkage additive, 0.1-0.5 part of synergistic antioxidant and 0.8-1.2 parts of nano reinforcing agent.
2. The + -535 kV ultrahigh-voltage flexible direct-current light polypropylene insulated power cable according to claim 1, wherein the nano reinforcing agent is polyhedral oligomeric silsesquioxane with a particle size of 1.2-1.6 nm.
3. The + -535 kV ultrahigh-voltage flexible direct-current light polypropylene insulated power cable as claimed in claim 1, wherein the shrinkage uniformity additive has a particle size of 0.75-95 μm, and the shrinkage uniformity additive is one or more of talc powder, calcium carbonate and calcined clay.
4. The + -535 kV ultrahigh-voltage flexible direct-current light polypropylene insulated power cable according to claim 1, wherein the thickness of the insulation layer is 25-30 mm.
5. The + -535 kV ultrahigh-voltage flexible direct-current light polypropylene insulated power cable according to claim 1, wherein the thickness of the insulation layer is 26 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011202470.8A CN112466513B (en) | 2020-11-02 | 2020-11-02 | Flexible direct current insulation power cable of 535kV superhigh pressure |
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| CN202011202470.8A CN112466513B (en) | 2020-11-02 | 2020-11-02 | Flexible direct current insulation power cable of 535kV superhigh pressure |
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| CN112466513B true CN112466513B (en) | 2022-02-15 |
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| CN112961437A (en) * | 2021-03-10 | 2021-06-15 | 西华大学 | Polypropylene-based insulated cable and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102254613A (en) * | 2011-04-27 | 2011-11-23 | 江苏亨通高压电缆有限公司 | High pressure and ultrahigh pressure direct current polyolefin insulated submarine power cable |
| US20140069682A1 (en) * | 2012-09-11 | 2014-03-13 | Apple Inc. | Cable structures and systems and methods for making the same |
| CN103854775A (en) * | 2014-03-12 | 2014-06-11 | 江苏华能电缆股份有限公司 | Seismic exploration cable |
| CN204537755U (en) * | 2015-04-24 | 2015-08-05 | 中天科技海缆有限公司 | The crosslinked polyetylene insulated optical fiber composite submarine power cable of three core 220kV |
| CN105609204A (en) * | 2016-03-21 | 2016-05-25 | 中天科技海缆有限公司 | +/-320 kV ultra-high voltage cross-linked polyethylene insulated flexible direct-current power cable |
| CN106448916A (en) * | 2016-11-30 | 2017-02-22 | 宜昌信通电缆有限公司 | Direct-current ultrahigh-voltage (+/- 150 kV to 500 kV) crosslinked polyethylene insulated photoelectric composite power cable |
| CN208538551U (en) * | 2018-08-16 | 2019-02-22 | 江苏中超控股股份有限公司 | Anti-flaming environment-friendly buried cable for airport flight assistant lamp light circuit |
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