CN218826361U - Medium-voltage fire-resistant power cable - Google Patents
Medium-voltage fire-resistant power cable Download PDFInfo
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- CN218826361U CN218826361U CN202222571659.5U CN202222571659U CN218826361U CN 218826361 U CN218826361 U CN 218826361U CN 202222571659 U CN202222571659 U CN 202222571659U CN 218826361 U CN218826361 U CN 218826361U
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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
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Abstract
The utility model provides a fire-resistant power cable of middling pressure, including three insulation shielding sinle silks, every insulation shielding sinle silk all is including the conductor that is located the center and being located outermost metallic shield, be equipped with the conductor shielding layer from inside to outside in proper order between conductor and the metallic shield, insulating layer and insulation shielding layer, three insulation shielding sinle silks form the cable core through the stranding transposition, the cable core is equipped with the protection inlayer outward, the protection inlayer has set gradually the fire stopping layer from inside to outside, the total shielding layer of metal, separate oxygen inner sheath, the metal armor, the flame retardant coating, fire-resistant protection layer and outer jacket, establish to the filling layer between cable core and the fire stopping layer, the protection inlayer is provided with the outer layer of putting out a fire outward. The utility model discloses can prevent and cut off flame temperature to inside propagation, solve the difficult problem that aluminium core cable fire resistance is poor, ensure simultaneously and keep the long-time normal operating of electric power when the conflagration breaing out, be applicable to rated voltage 3.6/6kV ~ 26/35kV civilian facility and industrial device distribution network.
Description
Technical Field
The utility model mainly relates to a power cable's technical field, concretely relates to fire-resistant power cable of middling pressure.
Background
Copper is listed as a second major war reserve material second to petroleum in China, but China is a country with deficient copper ore resources and a copper using country, and for the wire and cable industry of the second major industry second to the automobile industry, the cost of manufacturing the copper core wire and cable is too high because the copper conductor material occupies about 70% of the cost of the copper wire and cable. The main raw materials of aluminum oxide, iron and the like for producing the aluminum alloy cable are rich in reserves in China, and meanwhile, the aluminum product has the characteristics of light weight, low price and recyclability, so that the development of the aluminum alloy cable is in line with the national advocation of green, environmental protection, energy conservation and emission reduction, and is a strategy for truly adapting to the sustainable development of China.
Meanwhile, since the power cable needs to pass through building facilities and areas with relatively dense population, and the power cable in these areas is susceptible to complex natural factors, the power cable needs to have reliable fire-resistant function and environmental protection performance in order to prevent the power cable from causing fire accidents or causing secondary accidents under the condition of fire damage.
At present, a low-voltage (1 kV) fireproof power cable has corresponding national standards which are relatively mature, but a medium-voltage fireproof power cable has high voltage level and high safety requirements, application standards are not mature, no unified national standard exists, particularly, a fireproof cable adopting an aluminum alloy conductor and an aluminum alloy armor is more difficult to meet the fireproof requirements due to the fireproof characteristics of materials, and a stable fireproof function is realized by using the conventional structure at present, so that a lot of difficulties exist.
SUMMERY OF THE UTILITY MODEL
The utility model discloses technical scheme is too single technical problem to prior art solution, provides and is showing and be different from prior art's solution, specifically the utility model mainly provides a fire-resistant power cable of middling pressure for solve the technical problem who proposes in the above-mentioned background art.
The utility model provides a technical scheme that above-mentioned technical problem adopted does:
a medium-voltage fire-resistant power cable comprises three insulation shielding wire cores, wherein each insulation shielding wire core comprises a conductor positioned at the center and a metal shielding layer positioned on the outermost layer, a conductor shielding layer, an insulating layer and an insulation shielding layer are sequentially arranged between the conductor and the metal shielding layer from inside to outside, the three insulation shielding wire cores form a cable core through cabling and stranding, a protection inner layer is arranged outside the cable core, the protection inner layer is sequentially provided with a fire blocking layer, a metal total shielding layer, an oxygen-isolating inner protection layer, a metal armor layer, a fire-resistant protection layer and an outer protection layer from inside to outside, and a filling layer is arranged between the cable core and the fire blocking layer; the protection inlayer is provided with the outer layer of putting out a fire outward, the outer fire-retardant layer and the outermost wearing layer that are located the most inside of putting out a fire, be connected with the support hose of the even part of a plurality of between fire-retardant layer and the wearing layer, the fire-retardant layer outer wall coats and is stamped high temperature resistant adhesive layer, the interior wall mounting of wearing layer has a plurality of capsule granule, and every the capsule granule all embeds there is the dry powder granule.
Preferably, the conductor is formed by twisting aluminum alloy monofilaments or copper monofilaments, and the diameter of each aluminum alloy monofilament or each copper monofilament is 2.52-2.53 mm.
Preferably, the fire-blocking layer adopts a single-layer overlapping lapping alkali-free glass fiber cloth layer, the covering rate is 20-25%, the fire-resistant layer adopts a single-layer butt-joint lapping nanofiber aerogel lapping tape layer, the thickness of the nanofiber aerogel lapping tape is 1.5-2.0mm, the fire-resistant protective layer adopts a single-layer overlapping lapping alkali-free glass fiber cloth layer, and the covering rate is 10-15%.
Preferably, the oxygen-insulating inner protective layer and the oxygen-insulating outer protective layer both adopt low-smoke halogen-free polyolefin sheaths with oxygen indexes larger than 32.
Preferably, carbon dioxide is provided inside the support hose.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) The utility model discloses a keep off fire layer + flame retardant coating + fire-resistant protective layer combination fire-resistant structural design, long-term fire-resistant temperature can reach 1200 ℃ -1300 ℃, prevent and cut off flame temperature and propagate to inside, solve the poor difficult problem of aluminium core cable fire resistance, simultaneously inner sheath, the polyolefin sheath material that oxygen index is greater than 32 is adopted to the outer jacket, guarantee to keep electric power normal operating for a long time when taking place the conflagration, have characteristics such as fire-resistant, low cigarette, no halogen, fire-retardant, low toxicity, low heat release, especially reduce the casualties that causes because of the flue gas when the conflagration, the specially adapted rated voltage 3.6/6kV ~ 26/35kV civilian facilities and industrial installation distribution network, realize the transmission of electric power energy;
(2) When the cable meets fire, the fire firstly burns the wear-resistant layer, the wear-resistant layer transmits the high temperature of the fire, so that capsule particles are melted, dry powder particles in the capsule particles are scattered, part of the dry powder particles are adsorbed on the flame-retardant layer through the high-temperature-resistant adhesive layer, the cable is protected, the rest dry powder particles are in contact with the fire after the wear-resistant layer is burnt, the fire is reduced, the support hose is burnt by the fire, the carbon dioxide in the support hose leaks out, the spread of the fire is further prevented, and the cable can survive in the fire for a longer time;
(3) In this cable, the wearing layer can increase the wearability of cable, prevents that the cable friction from impaired, and the support hose carries out elastic support to the wearing layer, can increase the crushing resistance of cable to can increase the bending resistance of cable.
The present invention will be explained in detail with reference to the drawings and specific embodiments.
Drawings
Fig. 1 is a schematic cross-sectional view of the cable of the present invention;
fig. 2 is a schematic cross-sectional view of the insulation shielding wire core, the filling layer and the protective inner layer of the present invention;
FIG. 3 is a schematic cross-sectional view of the fire extinguishing outer layer of the utility model;
fig. 4 is an enlarged view of a portion a in fig. 3 according to the present invention.
In the figure: 1. an insulated shielding wire core; 11. a conductor; 12. a conductor shield layer; 13. an insulating layer; 14. an insulating shield layer; 15. a metal shielding layer; 2. a protective inner layer; 21. a fire barrier layer; 22. a metal total shield layer; 23. an oxygen-insulating inner protective layer; 24. a metal armor layer; 25. a refractory layer; 26. a refractory protective layer; 27. an outer jacket; 3. a filling layer; 4. an outer fire-extinguishing layer; 41. a flame retardant layer; 42. a wear layer; 43. a high temperature resistant adhesive layer; 44. a support hose; 45. and (4) capsule particles.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully with reference to the accompanying drawings, in which several embodiments of the present invention are shown, but the present invention can be implemented in different forms, and is not limited to the embodiments described in the text, but rather, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.
Please refer to fig. 1 and 2, the present invention provides a technical solution: the utility model provides a fire-resistant power cable of middling pressure, includes three insulation shield sinle silks 1, every insulation shield sinle silk 1 all includes conductor 11 that is located the center and is located outermost metallic shield 15, be equipped with conductor shield 12, insulating layer 13 and insulation shield 14 from inside to outside in proper order between conductor 11 and the metallic shield 15, conductor 11 adopts aluminum alloy monofilament or copper monofilament transposition to form, and aluminum alloy monofilament or copper monofilament diameter are 2.52 ~ 2.53mm, and conductor shield 2 adopts semiconduction high-voltage cross-linking material, insulating layer 3 adopt crosslinked polyethylene, and insulation shield 4 adopts semiconduction high-voltage cross-linking material, extrudes through dry-type crosslinked three-layer coextrusion equipment, and metallic shield 5 adopts overlapping copper strip, is not less than 15% around the covering rate of lapping, and metallic shield 5 can play the effect of electromagnetic shield, reduces the influence of external electromagnetism to signal in the cable core greatly.
Please refer to fig. 1 and 2, three insulation shielding wire cores 1 are stranded by cabling to form a cable core, a protective inner layer 2 is arranged outside the cable core, a fire barrier layer 21, a metal total shielding layer 22, an oxygen-insulating inner protective layer 23, a metal armor layer 24, a fire resistant layer 25, a fire resistant protective layer 26 and an outer protective layer 27 are sequentially arranged on the protective inner layer 2 from inside to outside, a filling layer 3 is arranged between the cable core and the fire barrier layer 21, the fire barrier layer 21 adopts a single-layer overlapping lapping alkali-free glass fiber cloth layer, the lapping rate is 20-25%, the fire barrier layer 21 has the function of fire blocking and plays a role of fastening the wire core, the metal total shielding layer 22 adopts a single-layer overlapping lapping copper strip, the lapping rate is not less than 15%, and the metal total shielding layer 22 plays a role of electromagnetic shielding, the influence of external electromagnetism to the signal in the cable core is greatly reduced, metal armor layer 24 adopts double-deck clearance to wind package non-magnetic metal band around the package clearance rate 45 ~ 50%, flame retardant coating 25 adopts the individual layer to seam around the package nanofiber aerogel on the band layer, and the nanofiber aerogel is 1.5-2.0mm around the package thickness of taking, fire-resistant protection layer 26 adopts the individual layer to overlap around the package alkali-free glass fabric layer, and it is 10-15% to take the lid rate, and fire-resistant protection layer 26 aims at protecting the flame retardant coating not loose and ensure that the appearance is more level and more smooth to extrude in the outer jacket process of back, oxygen-proof inner sheath 23 and outer jacket 27 all adopt the low smoke and zero halogen polyolefin sheath that the oxygen index is greater than 32, extrude through the extruding machine, have excellent oxygen-proof and fire behaviour.
Please refer to fig. 1-4, a fire extinguishing outer layer 4 is disposed outside the protection inner layer 2, the fire extinguishing outer layer 4 includes a fire retarding layer 41 located at the innermost portion and a wear-resistant layer 42 located at the outermost portion, a plurality of uniform supporting hoses 44 are connected between the fire retarding layer 41 and the wear-resistant layer 42, a high temperature resistant adhesive layer 43 covers the outer wall of the fire retarding layer 41, a plurality of capsule particles 45 are mounted on the inner wall of the wear-resistant layer 42, each capsule particle 45 is internally provided with dry powder particles, and carbon dioxide is disposed inside the supporting hose 44. The wearing layer 42 can increase the wearability of cable, it is impaired to prevent that cable friction, support hose 44 carries out elastic support to wearing layer 42, can increase the crushing resistance of cable, and can increase the bending resistance of cable, when the conflagration breaks out, fire burns wearing layer 42 at first, wearing layer 42 transmits the high temperature of fire, make capsule granule 45 melt, its inside dry powder granule scatters, partial dry powder granule passes through high temperature resistant adhesive layer 43 and adsorbs on fire-retardant layer 41, realize the protection to the cable, remaining dry powder granule is after wearing layer 42 is burnt totally and the fire contact, reduce the intensity of a fire, later support hose 44 is burnt by the fire, its inside carbon dioxide spills, further block stretching of the intensity of a fire, make the cable can survive the time of being more of a specified duration in the fire.
The utility model discloses a concrete operation mode as follows:
when a fire disaster occurs, fire burns the wear-resistant layer 42 at first, the wear-resistant layer 42 transmits the high temperature of fire, make capsule granule 45 melt, its inside dry powder granule scatters, some dry powder granule passes through high temperature resistant adhesive layer 43 and adsorbs on fire-retardant layer 41, realize the protection to the cable, the contact with fire after wear-resistant layer 42 is burnt completely, reduce the intensity of a fire, later support hose 44 is burnt by the fire, its inside carbon dioxide spills, further block stretching of the intensity of a fire, make the cable can survive in the fire for a long time, keep off fire layer 21, separate oxygen inner sheath 23, flame retardant coating 25, the combined design of fire-resistant protective layer 26 and outer jacket 27, long-term fire-resistant temperature can reach 1200 ℃ -1300 ℃, prevent and cut off flame temperature and propagate to inside, solve the poor difficult problem of aluminum core cable fire resistance, ensure to keep electric power long-time normal operating when the fire disaster simultaneously.
The present invention has been described above with reference to the accompanying drawings, and it is obvious that the present invention is not limited by the above-mentioned manner, if the method and the technical solution of the present invention are adopted, the present invention can be directly applied to other occasions without substantial improvement, and the present invention is within the protection scope of the present invention.
Claims (5)
1. The utility model provides a fire-resistant power cable of middling pressure, includes three insulation shielding sinle silks (1), its characterized in that: every insulation shielding sinle silk (1) all includes conductor (11) that are located the center and lie in outermost metallic shield (15), be equipped with conductor shielding layer (12), insulating layer (13) and insulation shielding layer (14) from inside to outside in proper order between conductor (11) and metallic shield (15), three insulation shielding sinle silks (1) form the cable core through the stranding transposition, the cable core is equipped with protection inlayer (2) outward, protection inlayer (2) have fire stopping layer (21) from inside to outside in proper order, the total shielding layer of metal (22), oxygen-insulated inner sheath (23), metal armor (24), flame retardant coating (25), fire-resistant protective layer (26) and outer jacket (27), establish to filling layer (3) between cable core and fire stopping layer (21);
be provided with outer (4) of putting out a fire outside protection inlayer (2) outward, put out a fire outer (4) including being located fire-retardant layer (41) and outermost wearing layer (42) of the most inside, be connected with the support hose (44) of the even part of a plurality of between fire-retardant layer (41) and wearing layer (42), it has high temperature resistant adhesive layer (43) to cover on fire-retardant layer (41) outer wall, install a plurality of capsule granule (45) on wearing layer (42) inner wall, and every capsule granule (45) all embed has dry powder granule.
2. A medium voltage fire resistant power cable according to claim 1, characterized in that: the conductor (11) is formed by twisting aluminum alloy monofilaments or copper monofilaments, and the diameter of each aluminum alloy monofilament or each copper monofilament is 2.52-2.53 mm.
3. A medium voltage fire resistant power cable according to claim 1, characterized in that: the fireproof layer (21) is formed by lapping a single-layer overlapping alkali-free glass fiber cloth layer, the lapping rate is 20-25%, the fireproof layer (25) is formed by lapping a single-layer butt joint lapping nanofiber aerogel lapping tape layer, the thickness of the nanofiber aerogel lapping tape is 1.5-2.0mm, the fireproof protective layer (26) is formed by lapping a single-layer overlapping alkali-free glass fiber cloth layer, and the lapping rate is 10-15%.
4. A medium voltage fire resistant power cable according to claim 1, characterized in that: the oxygen-insulating inner protection layer (23) and the outer protection layer (27) both adopt low-smoke halogen-free polyolefin sheaths with oxygen indexes larger than 32.
5. A medium voltage fire resistant power cable according to claim 1, characterized in that: carbon dioxide is arranged inside the supporting hose (44).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222571659.5U CN218826361U (en) | 2022-09-28 | 2022-09-28 | Medium-voltage fire-resistant power cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222571659.5U CN218826361U (en) | 2022-09-28 | 2022-09-28 | Medium-voltage fire-resistant power cable |
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| Publication Number | Publication Date |
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| CN218826361U true CN218826361U (en) | 2023-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222571659.5U Active CN218826361U (en) | 2022-09-28 | 2022-09-28 | Medium-voltage fire-resistant power cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117877790A (en) * | 2024-03-11 | 2024-04-12 | 四川省万阳电缆有限公司 | High-strength cable based on copper alloy material and manufacturing method |
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2022
- 2022-09-28 CN CN202222571659.5U patent/CN218826361U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117877790A (en) * | 2024-03-11 | 2024-04-12 | 四川省万阳电缆有限公司 | High-strength cable based on copper alloy material and manufacturing method |
| CN117877790B (en) * | 2024-03-11 | 2024-05-24 | 四川省万阳电缆有限公司 | High-strength cable based on copper alloy material and manufacturing method |
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