CN111613377B - Mineral insulated cable - Google Patents
Mineral insulated cable Download PDFInfo
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- CN111613377B CN111613377B CN202010440352.4A CN202010440352A CN111613377B CN 111613377 B CN111613377 B CN 111613377B CN 202010440352 A CN202010440352 A CN 202010440352A CN 111613377 B CN111613377 B CN 111613377B
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
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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
- H01B7/0208—Cables with several layers of insulating material
- H01B7/0216—Two layers
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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
Abstract
The invention relates to the technical field of power cables, and provides a mineral insulated cable which comprises a cable core, an inner shielding layer, a mica tape layer, an inner insulating layer, an outer shielding layer, a quartz net layer, an outer insulating layer and a sheath layer which are sequentially coated from inside to outside, wherein the inner shielding layer adopts modified expanded graphite fibers, the outer shielding layer adopts a compound of the modified expanded graphite fibers/conductive carbon black, the inner insulating layer adopts one or two of ceramic silicon rubber and ceramic polyolefin, and the outer insulating layer adopts one or two of ceramic silicon rubber and mica tape.
Description
Technical Field
The invention relates to the technical field of power cables, in particular to a mineral insulated cable.
Background
Cables are generally rope-like cables made by stranding several or groups of conductors, at least two in each group, each group being insulated from each other and often twisted around a center, the entire outer surface being covered with a highly insulating covering. The device is erected in the air or installed underground or underwater for telecommunication or power transmission.
The cable is mainly composed of the following 4 parts. Firstly, a conductive wire core: made of a high conductivity material (copper or aluminum). Each core may be formed by twisting a single wire or a plurality of wires according to the requirement of laying and using conditions on the flexibility degree of the cable. Insulating layer: the insulating material used as the cable should have high insulation resistance, high breakdown field strength, low dielectric loss and low dielectric constant. Common insulating materials used in cables are oil-impregnated paper, polyvinyl chloride, polyethylene, crosslinked polyethylene, rubber, and the like. Cables are often classified as insulating materials, such as oil impregnated paper insulated cables, polyvinyl chloride cables, crosslinked polyethylene cables, and the like. Sealing the sheath: protecting the insulated wire core from mechanical, moisture, humidity, chemicals, light, etc. For moisture-sensitive insulation, a lead or aluminum extrusion seal jacket is generally used. Protecting the covering layer: to protect the sealing boot from mechanical damage. Galvanized steel strips, steel wires or copper strips, copper wires and the like are generally used as armor to wrap the armor outside a sheath (called an armored cable), and the armor layer simultaneously plays the roles of shielding an electric field and preventing external electromagnetic wave interference. In order to avoid corrosion of the steel belts and wires by the surrounding medium, they are generally coated with asphalt or wrapped with an impregnated jute layer or an extruded polyethylene or polyvinyl chloride sheath.
With the improvement of living standard of people, the power supply is more and more tense, and the insulating rubber material used in the high-voltage electric field becomes a hot point of research. The traditional insulating material for cable accessories is ethylene propylene diene monomer, but with the continuous and deep research on materials such as silicon rubber, polyolefin and the like, people find that the cable accessories are more resistant to high temperature, ultraviolet rays and oxidation, have stronger hydrophobicity and better arc resistance and affinity to human bodies, but still have some complement to be improved, such as insufficient toughness, insufficient hardness and abrasion resistance and the like, and further improvement is needed.
Disclosure of Invention
Aiming at the existing problems, the invention provides the mineral insulated cable, which greatly improves the insulativity, the fire resistance and the wear resistance of the cable by reasonably designing the interlayer structure of the cable and optimizing the ingredients, has high flexibility and obviously improves the comprehensive mechanical property and the electrical safety property.
In order to achieve the above object, the present invention adopts the following technical solutions:
a mineral insulated cable comprises a cable core, an inner shielding layer, a mica tape layer, an inner insulating layer, an outer shielding layer, a quartz net layer, an outer insulating layer and a sheath layer which are sequentially coated from inside to outside, wherein the inner shielding layer adopts modified expanded graphite fibers, the outer shielding layer adopts a compound of the modified expanded graphite fibers/conductive carbon black, the inner insulating layer adopts one or two of ceramic silicon rubber and ceramic polyolefin, and the outer insulating layer adopts one or two of ceramic silicon rubber and mica tape.
As a further optimization of the invention, the cable core adopts a copper conductor or an aluminum conductor.
As further optimization of the invention, the modified expanded graphite fiber of the inner shielding layer is the expanded graphite fiber loaded with nano aluminum nitride, and the nano aluminum nitride loading rate is 7.3-9.2 wt%.
As further optimization of the invention, the mass percent of the modified expanded graphite fiber and the conductive carbon black in the outer shielding layer is 45-60 wt% to 40-55 wt%; wherein the modified expanded graphite fiber is an expanded graphite fiber loaded with nano aluminum nitride, and the nano aluminum nitride loading rate is 7.3-9.2 wt%; the conductive carbon black is conductive carbon black powder which takes calcined argil and polyethylene wax as adhesives, and the mass ratio of the calcined argil to the polyethylene wax is 1: 2-4:12-15.
As a further optimization of the invention, the quartz net layer is woven by quartz wires, and the weaving density is 80-85%.
As further optimization of the invention, the ceramic silicon rubber in the inner insulating layer or the outer insulating layer consists of silicon rubber and ceramic materials in a mass ratio of 1:0.5-0.8, wherein the silicon rubber comprises nano silicon dioxide, borosilicate rubber, methyl vinyl phenyl silicon rubber, hydroxyl silicone oil and a dispersing agent; the ceramic material is one or more of borax, low-melting glass powder, talcum powder, calcined argil, light magnesium oxide, bentonite and alumina.
As a further optimization of the invention, the ceramic polyolefin of the inner insulating layer consists of polyolefin and ceramic material in a mass ratio of 1:0.7-1.2, wherein the polyolefin comprises ethylene-vinyl acetate copolymer, ethylene-propylene copolymer, fluorinated ethylene-propylene copolymer, dispersant and lubricant; the ceramic material is one or more of borax, low-melting glass powder, talcum powder, calcined argil, light magnesium oxide, bentonite and alumina.
As further optimization of the invention, the sheath layer adopts the same ceramic polyolefin raw material as the inner insulating layer, wherein the mass ratio of the polyolefin to the ceramic material is 1: 1-1.5.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
according to the invention, through reasonably designing the interlayer structure of the cable and optimizing the ingredients, the insulativity, the flame retardance, the toughness and the wear resistance of the cable are greatly improved, and the comprehensive mechanical property and the electrical safety property are obviously improved.
Compared with the traditional power cable interlayer structure, the mica tape layer and the quartz net layer are selectively added, excellent interlayer framework support is provided for the cable structure, the binding force and the anti-deformation effect are good, the mechanical property and the structural stability are greatly improved, meanwhile, the high-specific-surface-area layer structure layer is provided, the interlayer reaction combination degree is high, and the space coupling force is strong.
Moreover, the selection and matching of the shielding layer material and the insulating layer material are optimized, the shielding layer takes graphite and carbon black as main shielding materials, on the basis, the modification activation is carried out, the electromagnetic shielding and piezoelectric effects of the material are effectively improved, and the shielding layer is adjacent to the insulating layer, wherein the doped nano aluminum nitride, calcined argil, polyethylene wax and the like have excellent rheological compatibility with silica gel and polyolefin, which is beneficial to the uniform dispersion of effective components, meanwhile, the composite material has an excellent promoting effect on the reaction compatibility among materials, greatly improves the interlayer cohesiveness, has a more balanced and stable material structure, has an excellent mechanical reinforcing effect because the insulating layer mainly adopts ceramic materials or replaces the original rubber material, and has remarkably improved strength and toughness and hardness and stronger comprehensive mechanical property when matched with a mica tape layer of inorganic minerals and a supporting framework of a quartz net layer.
Drawings
FIG. 1 is a schematic view of the construction of a mineral insulated cable according to the invention;
in the figure: the cable comprises a cable core 1, an inner shielding layer 2, a mica tape layer 3, an inner insulating layer 4, an outer shielding layer 5, a quartz net layer 6, an outer insulating layer 7 and a sheath layer 8.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Example 1:
a mineral insulated cable comprises a cable core 1, an inner shielding layer 2, a mica tape layer 3, an inner insulating layer 4, an outer shielding layer 5, a quartz mesh layer 6, an outer insulating layer 7 and a sheath layer 8 which are sequentially coated from inside to outside,
wherein the content of the first and second substances,
the cable core adopts a copper conductor.
The inner shielding layer adopts modified expanded graphite fiber, the modified expanded graphite fiber is expanded graphite fiber loaded with nano aluminum nitride, and the loading rate of the nano aluminum nitride is 8.4 wt%.
The mica tape layer is prepared by lapping a mixture of phlogopite and biotite, wherein the phlogopite accounts for not less than 60 wt% (65.2%, the same below).
The inner insulating layer adopts ceramic silicon rubber; the ceramic silicon rubber is composed of silicon rubber and ceramic materials in a mass ratio of 1:0.5, wherein the silicon rubber comprises nano silicon dioxide, borosilicate rubber, methyl vinyl phenyl silicon rubber, hydroxyl silicone oil and a dispersing agent; the ceramic material is selected from one or more of borax, low-melting glass powder, talcum powder, calcined argil, light magnesium oxide, bentonite and alumina;
the outer shielding layer is a compound of modified expanded graphite fiber/conductive carbon black, and the mass percent of the modified expanded graphite fiber and the conductive carbon black is 50 wt% to 50 wt%; wherein the modified expanded graphite fiber is an expanded graphite fiber loaded with nano aluminum nitride, and the nano aluminum nitride loading rate is 8.1 wt%; the conductive carbon black is conductive carbon black powder which takes calcined argil and polyethylene wax as adhesives, and the mass ratio of the calcined argil to the polyethylene wax is 1: 4:15.
The quartz net layer is formed by weaving quartz wires, and the weaving density is 83.6%.
The outer insulating layer adopts ceramic silicon rubber; the ceramic silicon rubber is composed of silicon rubber and ceramic materials in a mass ratio of 1:0.5, wherein the silicon rubber comprises nano silicon dioxide, borosilicate rubber, methyl vinyl phenyl silicon rubber, hydroxyl silicone oil and a dispersing agent; the ceramic material is selected from one or more of borax, low-melting glass powder, talcum powder, calcined argil, light magnesium oxide, bentonite and alumina;
the sheath layer is made of ceramic polyolefin raw materials, wherein the mass ratio of polyolefin to ceramic materials is 1: 1; the polyolefin comprises ethylene-vinyl acetate copolymer, ethylene-propylene copolymer, fluorinated ethylene-propylene copolymer, dispersant and lubricant; the ceramic material is one or more of borax, low-melting glass powder, talcum powder, calcined argil, light magnesium oxide, bentonite and alumina.
Example 2:
a mineral insulated cable comprises a cable core 1, an inner shielding layer 2, a mica tape layer 3, an inner insulating layer 4, an outer shielding layer 5, a quartz mesh layer 6, an outer insulating layer 7 and a sheath layer 8 which are sequentially coated from inside to outside,
wherein the content of the first and second substances,
the cable core adopts a copper conductor.
The inner shielding layer adopts modified expanded graphite fiber, the modified expanded graphite fiber is expanded graphite fiber loaded with nano aluminum nitride, and the load rate of the nano aluminum nitride is 8.9 wt%.
The mica tape layer is prepared by lapping a mixture of phlogopite and biotite, wherein the phlogopite accounts for not less than 60 wt%.
The inner insulating layer adopts ceramic silicon rubber; the ceramic silicon rubber is composed of silicon rubber and ceramic materials in a mass ratio of 1:0.8, wherein the silicon rubber comprises nano silicon dioxide, borosilicate rubber, methyl vinyl phenyl silicon rubber, hydroxyl silicone oil and a dispersing agent; the ceramic material is selected from one or more of borax, low-melting glass powder, talcum powder, calcined argil, light magnesium oxide, bentonite and alumina;
the outer shielding layer is a compound of modified expanded graphite fiber/conductive carbon black, and the mass percentage of the modified expanded graphite fiber to the conductive carbon black is 60 wt% to 40 wt%; wherein the modified expanded graphite fiber is an expanded graphite fiber loaded with nano aluminum nitride, and the nano aluminum nitride loading rate is 9 wt%; the conductive carbon black is conductive carbon black powder which takes calcined argil and polyethylene wax as adhesives, and the mass ratio of the calcined argil to the polyethylene wax is 1: 4:15.
The quartz net layer is formed by weaving quartz wires, and the weaving density is 80-85%.
The outer insulating layer is made of ceramic silicon rubber, the ceramic silicon rubber is composed of silicon rubber and ceramic materials in a mass ratio of 1:0.8, and the silicon rubber comprises nano silicon dioxide, borosilicate rubber, methyl vinyl phenyl silicon rubber, hydroxyl silicone oil and a dispersing agent; the ceramic material is selected from one or more of borax, low-melting glass powder, talcum powder, calcined argil, light magnesium oxide, bentonite and alumina;
the sheath layer is made of ceramic polyolefin raw materials, wherein the mass ratio of the polyolefin to the ceramic materials is 1: 1.5; the polyolefin comprises ethylene-vinyl acetate copolymer, ethylene-propylene copolymer, fluorinated ethylene-propylene copolymer, dispersant and lubricant; the ceramic material is one or more of borax, low-melting glass powder, talcum powder, calcined argil, light magnesium oxide, bentonite and alumina.
Example 3:
a mineral insulated cable comprises a cable core 1, an inner shielding layer 2, a mica tape layer 3, an inner insulating layer 4, an outer shielding layer 5, a quartz mesh layer 6, an outer insulating layer 7 and a sheath layer 8 which are sequentially coated from inside to outside,
wherein the content of the first and second substances,
the cable core adopts a copper conductor.
The inner shielding layer adopts modified expanded graphite fiber, the modified expanded graphite fiber is expanded graphite fiber loaded with nano aluminum nitride, and the load rate of the nano aluminum nitride is 7.7 wt%.
The mica tape layer is prepared by lapping a mixture of phlogopite and biotite, wherein the phlogopite accounts for not less than 60 wt%.
The inner insulating layer is made of ceramic polyolefin, and the ceramic polyolefin is composed of polyolefin and ceramic material in a mass ratio of 1:0.9, wherein the polyolefin comprises ethylene-vinyl acetate copolymer, ethylene-propylene copolymer, fluorinated ethylene-propylene copolymer, dispersant and lubricant; the ceramic material is one or more of borax, low-melting glass powder, talcum powder, calcined argil, light magnesium oxide, bentonite and alumina.
The outer shielding layer is a compound of modified expanded graphite fiber/conductive carbon black, and the mass percent of the modified expanded graphite fiber and the conductive carbon black is 55 wt% to 45 wt%; wherein the modified expanded graphite fiber is an expanded graphite fiber loaded with nano aluminum nitride, and the nano aluminum nitride loading rate is 7.8 wt%; the conductive carbon black is conductive carbon black powder which takes calcined argil and polyethylene wax as adhesives, and the mass ratio of the calcined argil to the polyethylene wax is 1: 3:14.
The quartz net layer is formed by weaving quartz wires, and the weaving density is 80-85%.
The outer insulating layer is made of ceramic silicon rubber, the ceramic silicon rubber is composed of silicon rubber and ceramic materials in a mass ratio of 1:0.6, and the silicon rubber comprises nano silicon dioxide, borosilicate rubber, methyl vinyl phenyl silicon rubber, hydroxyl silicone oil and a dispersing agent; the ceramic material is selected from one or more of borax, low-melting glass powder, talcum powder, calcined argil, light magnesium oxide, bentonite and alumina;
the sheath layer is made of the same ceramic polyolefin raw material as the inner insulating layer, wherein the mass ratio of the polyolefin to the ceramic material is 1: 1.5.
Example 4:
a mineral insulated cable comprises a cable core 1, an inner shielding layer 2, a mica tape layer 3, an inner insulating layer 4, an outer shielding layer 5, a quartz mesh layer 6, an outer insulating layer 7 and a sheath layer 8 which are sequentially coated from inside to outside,
wherein the content of the first and second substances,
the cable core adopts a copper conductor.
The inner shielding layer adopts modified expanded graphite fiber, the modified expanded graphite fiber is expanded graphite fiber loaded with nano aluminum nitride, and the load rate of the nano aluminum nitride is 7.5 wt%.
The mica tape layer is prepared by lapping a mixture of phlogopite and biotite, wherein the phlogopite accounts for not less than 60 wt%.
The inner insulating layer adopts ceramic polyolefin; the ceramic polyolefin consists of polyolefin and ceramic material in a mass ratio of 1:1.2, wherein the polyolefin comprises ethylene-vinyl acetate copolymer, ethylene-propylene copolymer, fluorinated ethylene-propylene copolymer, dispersant and lubricant; the ceramic material is one or more of borax, low-melting glass powder, talcum powder, calcined argil, light magnesium oxide, bentonite and alumina.
The outer shielding layer is a compound of modified expanded graphite fiber/conductive carbon black, and the mass percentage of the modified expanded graphite fiber to the conductive carbon black is 45 wt% to 55 wt%; wherein the modified expanded graphite fiber is an expanded graphite fiber loaded with nano aluminum nitride, and the nano aluminum nitride loading rate is 8.4 wt%; the conductive carbon black is conductive carbon black powder which takes calcined argil and polyethylene wax as adhesives, and the mass ratio of the calcined argil to the polyethylene wax is 1: 2:13.
The quartz net layer is formed by weaving quartz wires, and the weaving density is 80-85%.
The outer insulating layer adopts ceramic silicon rubber; the ceramic silicon rubber is composed of silicon rubber and ceramic materials in a mass ratio of 1:0.8, wherein the silicon rubber comprises nano silicon dioxide, borosilicate rubber, methyl vinyl phenyl silicon rubber, hydroxyl silicone oil and a dispersing agent; the ceramic material is selected from one or more of borax, low-melting glass powder, talcum powder, calcined argil, light magnesium oxide, bentonite and alumina;
the sheath layer is made of the same ceramic polyolefin raw material as the inner insulating layer, wherein the mass ratio of the polyolefin to the ceramic material is 1: 1.5.
Example 5:
a mineral insulated cable comprises a cable core 1, an inner shielding layer 2, a mica tape layer 3, an inner insulating layer 4, an outer shielding layer 5, a quartz mesh layer 6, an outer insulating layer 7 and a sheath layer 8 which are sequentially coated from inside to outside,
wherein the content of the first and second substances,
the cable core adopts a copper conductor.
The inner shielding layer adopts modified expanded graphite fiber, the modified expanded graphite fiber is expanded graphite fiber loaded with nano aluminum nitride, and the load rate of the nano aluminum nitride is 7.5 wt%.
The mica tape layer is prepared by lapping a mixture of phlogopite and biotite, wherein the phlogopite accounts for not less than 60 wt%.
The inner insulating layer adopts ceramic silicon rubber and ceramic polyolefin composition, and the mass ratio of the ceramic silicon rubber to the ceramic polyolefin composition is 1: 1;
the ceramic silicon rubber is composed of silicon rubber and ceramic materials in a mass ratio of 1:0.6, wherein the silicon rubber comprises nano silicon dioxide, borosilicate rubber, methyl vinyl phenyl silicon rubber, hydroxyl silicone oil and a dispersing agent; the ceramic material is selected from one or more of borax, low-melting glass powder, talcum powder, calcined argil, light magnesium oxide, bentonite and alumina;
the ceramic polyolefin consists of polyolefin and ceramic material in a mass ratio of 1:1, wherein the polyolefin comprises ethylene-vinyl acetate copolymer, ethylene-propylene copolymer, fluorinated ethylene-propylene copolymer, dispersant and lubricant; the ceramic material is one or more of borax, low-melting glass powder, talcum powder, calcined argil, light magnesium oxide, bentonite and alumina.
The outer shielding layer is a compound of modified expanded graphite fiber/conductive carbon black, and the mass percent of the modified expanded graphite fiber and the conductive carbon black is 50 wt% to 50 wt%; wherein the modified expanded graphite fiber is an expanded graphite fiber loaded with nano aluminum nitride, and the nano aluminum nitride loading rate is 7.6 wt%; the conductive carbon black is conductive carbon black powder which takes calcined argil and polyethylene wax as adhesives, and the mass ratio of the calcined argil to the polyethylene wax is 1: 2:15.
The quartz net layer is formed by weaving quartz wires, and the weaving density is 80-85%.
The outer insulating layer adopts a mica tape; the mica tape is also prepared by lapping a mixture of phlogopite and biotite, wherein the phlogopite accounts for not less than 60 wt%.
The sheath layer is made of the same ceramic polyolefin raw material as the inner insulating layer, wherein the mass ratio of the polyolefin to the ceramic material is 1: 1.3.
Comparative example 1:
based on the embodiment 1, a mica tape layer and a quartz net layer are deleted, and the rest conditions are unchanged;
comparative example 2:
based on the embodiment 1, the raw materials of the inner shielding layer and the outer shielding layer adopt conventional expanded graphite or conductive carbon black (single component), and the rest conditions are unchanged;
comparative example 3:
based on the example 1, replacing the ceramic silicon rubber or ceramic polyolefin involved in the method with the conventional silicon rubber or polyolefin, and keeping the rest conditions unchanged;
blank group:
in combination with comparative examples 1-3, the mica tape layer and the quartz mesh layer are removed, the raw materials of the inner shielding layer and the outer shielding layer adopt the conventional expanded graphite or conductive carbon black (single component), the ceramic silicon rubber or ceramic polyolefin involved in the conventional expanded graphite or conductive carbon black is replaced by the conventional silicon rubber or polyolefin, and the rest conditions are not changed.
The products of the examples of the invention were tested for performance against the comparative products, and the data were compared as follows:
it is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A mineral insulated cable characterized by: the cable comprises a cable core, an inner shielding layer, a mica tape layer, an inner insulating layer, an outer shielding layer, a quartz net layer, an outer insulating layer and a sheath layer which are sequentially coated from inside to outside, wherein the inner shielding layer adopts modified expanded graphite fibers, the outer shielding layer adopts a compound of the modified expanded graphite fibers/conductive carbon black, the inner insulating layer adopts one or two of ceramic silicon rubber and ceramic polyolefin, and the outer insulating layer adopts one or two of ceramic silicon rubber and mica tape;
the modified expanded graphite fiber of the inner shielding layer is an expanded graphite fiber loaded with nano aluminum nitride, and the nano aluminum nitride loading rate is 7.3-9.2 wt%.
2. Mineral-insulated cable according to claim 1, characterized in that: the cable core adopts a copper conductor or an aluminum conductor.
3. Mineral-insulated cable according to claim 1, characterized in that: the mass percentage of the modified expanded graphite fiber and the conductive carbon black in the outer shielding layer is 45-60 wt% to 40-55 wt%; wherein the modified expanded graphite fiber is an expanded graphite fiber loaded with nano aluminum nitride, and the nano aluminum nitride loading rate is 7.3-9.2 wt%; the conductive carbon black is conductive carbon black powder which takes calcined argil and polyethylene wax as adhesives, and the mass ratio of the calcined argil to the polyethylene wax is 1: 2-4:12-15.
4. Mineral-insulated cable according to claim 1, characterized in that: the quartz net layer is formed by weaving quartz wires, and the weaving density is 80-85%.
5. Mineral-insulated cable according to claim 1, characterized in that: the ceramic silicon rubber in the inner insulating layer or the outer insulating layer is composed of silicon rubber and ceramic materials in a mass ratio of 1:0.5-0.8, wherein the silicon rubber comprises nano silicon dioxide, borosilicate rubber, methyl vinyl phenyl silicon rubber, hydroxyl silicone oil and a dispersing agent; the ceramic material is one or more of borax, low-melting glass powder, talcum powder, calcined argil, light magnesium oxide, bentonite and alumina.
6. Mineral-insulated cable according to claim 1, characterized in that: the ceramic polyolefin of the inner insulating layer consists of polyolefin and ceramic material in a mass ratio of 1:0.7-1.2, wherein the polyolefin comprises ethylene-vinyl acetate copolymer, ethylene-propylene copolymer, fluorinated ethylene-propylene copolymer, dispersant and lubricant; the ceramic material is one or more of borax, low-melting glass powder, talcum powder, calcined argil, light magnesium oxide, bentonite and alumina.
7. Mineral insulated cable according to claim 6, characterized in that: the sheath layer is made of the same ceramic polyolefin raw material as the inner insulating layer, wherein the mass ratio of the polyolefin to the ceramic material is 1: 1-1.5.
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| CN202010440352.4A CN111613377B (en) | 2020-05-22 | 2020-05-22 | Mineral insulated cable |
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| FR3003993B1 (en) * | 2013-03-29 | 2016-08-19 | Nexans | ELECTRICAL CABLE COMPRISING A GRADIENT LAYER OF ELECTRICAL PROPERTY |
| CN105023641A (en) * | 2015-06-16 | 2015-11-04 | 安徽天元电缆有限公司 | Light flame-retardant plate shielding flame-retardant composite layer, filling layer and manufacturing method thereof |
| CN205881508U (en) * | 2016-07-14 | 2017-01-11 | 东莞市成天泰电线电缆有限公司 | Mineral insulation pottery vitrification silica gel fireproof cable |
| CN106566394B (en) * | 2016-10-21 | 2018-08-31 | 海丰县美达化工涂料有限公司 | A kind of special semi-conductive screen graphene coating of cable and preparation method |
| CN209708690U (en) * | 2019-03-31 | 2019-11-29 | 中宁县智才技术服务有限公司 | A kind of insulated flame-resistant cable |
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