CN211957200U - Fire-resistant ultrahigh-voltage cable - Google Patents
Fire-resistant ultrahigh-voltage cable Download PDFInfo
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- CN211957200U CN211957200U CN202021045404.XU CN202021045404U CN211957200U CN 211957200 U CN211957200 U CN 211957200U CN 202021045404 U CN202021045404 U CN 202021045404U CN 211957200 U CN211957200 U CN 211957200U
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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 discloses a fire-resistant ultra-high voltage cable, which is characterized by comprising a conductor, a composite insulating layer, a water-resistant layer, a metal sheath layer, a heat-insulating layer, a metal fireproof layer and a sheath layer which are tightly coated from inside to outside in sequence; the composite insulating layer comprises a wrapping inner shielding layer, an extruding inner shielding layer, an insulating layer and an outer shielding layer. The metal flame retardant coating and the metal sheath layer can block flame, the heat-proof performance of the water blocking layer, the heat-insulating layer and the sheath layer is excellent, and the composite structure of the composite insulating layer has fire resistance, so that the fire-resistant and high-temperature-resistant capacity of the fire-resistant ultra-high voltage cable is strong, and normal electric power transmission can be kept when a fire disaster occurs.
Description
Technical Field
The utility model relates to an extra-high voltage cable technical field, concretely relates to fire-resistant extra-high voltage cable.
Background
With the rapid development of economic construction, high-voltage long-distance large-area cables are widely applied. The ultra-high voltage cable refers to a cable with a voltage transmission range of 275kV to 800kV, and is generally used for ultra-high voltage power transmission. The ultra-high voltage cable is used as an important carrier for transmitting power, the action range of the ultra-high voltage cable is large, and once the ultra-high voltage cable breaks down and stops transmitting power, the affected range is also large, so that the ultra-high voltage cable needs to be ensured to be stably and safely continuously operated.
The applicant investigated and found that the existing ultra-high voltage cable has the following problems:
when a fire disaster happens, the conventional ultrahigh voltage cable is difficult to maintain normal power transmission, normal power supply of rescue equipment is influenced, rescue is delayed, and the safety of lives and properties of people is threatened.
SUMMERY OF THE UTILITY MODEL
In order to overcome the poor technical defect of above-mentioned superhigh pressure cable fire resistance, the utility model provides a fire-resistant superhigh pressure cable, its fire resistance is good, can keep normal transmission of electricity when the conflagration takes place.
In order to solve the above problem, the utility model discloses realize according to following technical scheme:
the utility model relates to a fire-resistant ultrahigh voltage cable, which is characterized by comprising a conductor, a composite insulating layer, a water-resistant layer, a metal sheath layer, a heat-insulating layer, a metal fireproof layer and a sheath layer which are tightly coated from inside to outside in sequence;
the composite insulating layer comprises a wrapping inner shielding layer, an extruding inner shielding layer, an insulating layer and an outer shielding layer.
Preferably, the conductor is a stranded conductor structure.
Preferably, the conductor is a compacted circular conductor structure.
Preferably, the conductor is a split conductor structure.
Preferably, the metal fire-proof layer is a corrugated stainless steel copper sheath.
Preferably, the sheath layer comprises an inner sheath and an outer sheath.
Preferably, the inner sheath is made of a ceramized polyolefin material.
Preferably, the outer sheath is made of high flame retardant PVC material.
Preferably, the water-blocking layer is made of a semi-conductive buffering water-blocking tape.
Preferably, the lapping inner shield layer is made of one of a semi-conductive nylon tape and a semi-conductive Teflon tape.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses be provided with metal flame retardant coating and metal sheathing layer, can support the outside flame of cable when the conflagration breaing out to prevent that flame from burning out cable inner structure and influencing cable normal work.
2. The utility model discloses a water blocking layer, insulating layer and restrictive coating mutually support, and the heat-proof quality is excellent, can guarantee that the cable protects composite insulation layer's insulating properties under the high temperature environment of conflagration breaing out to make the cable keep normal electric power transmission.
3. The utility model discloses well composite insulation layer's composite construction has refractiveness, when the conflagration breaing out, can prevent effectively that the insulating nature of cable from receiving destruction to guarantee the normal electric power transmission under the condition of conflagration breaing out.
Drawings
The following detailed description of embodiments of the invention is provided with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural view of a fire-resistant ultra-high voltage cable according to the present invention;
in the figure:
1-a conductor;
2-composite insulating layer, 21-inner shielding layer, 22-extruded inner shielding layer, 23-insulating layer and 24-outer shielding layer;
3-a water-resistant layer;
4-metal sheath layer
5-a heat insulation layer;
6-Metal fire-proof layer
7-sheath layer, 71-inner sheath, 72-outer sheath.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
As shown in fig. 1, the preferred structure of the fire-resistant ultra-high voltage cable of the present invention is shown.
As shown in fig. 1, for fire-resistant ultra-high temperature cable, it includes closely clad conductor 1, composite insulation layer 2, water blocking layer 3, metal sheath layer 4, insulating layer 5, metal flame retardant coating 6 and restrictive coating 7 from inside to outside in proper order.
Wherein the conductor 1 is used for transmitting electric power. The composite insulating layer 2 can ensure the insulation of the conductor 1 from the outside to prevent electric leakage. The water-blocking layer 3 serves to block water longitudinally. The metal sheath layer 4 serves to block external flames in case of a fire, so as to protect the internal structure of the cable. The heat insulation layer 5 is used for heat insulation, and prevents the cable from being damaged by external high temperature when a fire disaster happens. The sheath layer 7 is used for protecting the cable, and the sheath layer 7 can bear external physical damage and high temperature in case of fire.
The conductor 1 is formed by drawing and twisting oxygen-free copper rods, and in the embodiment, the structure of the conductor 1 is preferably a twisted conductor structure which conforms to the second conductor structure specified in GB/T3956-2008.
When the size of the conductor 1 is 800mm2When the specifications are met, the structure of the conductor 1 is a split conductor structure, the conductor 1 in the split conductor structure is divided into a plurality of fan-shaped strand blocks, when the interface of the conductor 1 is too large, the split conductor structure can overcome the skin effect and the proximity effect, so that the current in the conductor 1 is uniform, and the conductivity is good.
When the size of the conductor 1 is 800mm2In the following, a compact round conductor structure is used. The compression of the round conductor structure reduces the amount of insulation around the conductor 1 and reduces the outer diameter of the cable.
The composite insulating layer 2 comprises a wrapping inner shielding layer 21, an extruding inner shielding layer 22, an insulating layer 23 and an outer shielding layer 24.
The lapping inner shielding layer 21 is lapped on the periphery of the conductor 1, and the lapping shielding layer is formed by lapping a semi-conductive nylon belt. The semiconductive nylon belt has low resistance and semiconductive property, and can effectively weaken the electric field intensity.
As another embodiment, the wrapped inner shield layer 21 is formed by wrapping a semi-conductive teflon tape.
The extruded inner shielding layer 22 is tightly wrapped on the periphery of the wrapped inner shielding layer 21, and the extruded inner shielding layer 22 is made of a semi-conductive inner shielding material.
The insulating layer 23 is wrapped on the periphery of the extruded inner shielding layer 22, and the insulating layer 23 is made of a cross-linked polyethylene insulating material. The performance of the cross-linked modified polyethylene material is greatly improved, the comprehensive performances such as mechanical property, environmental stress cracking resistance, chemical corrosion resistance, creep resistance, electrical property and the like are obviously improved, and the heat resistance is obviously improved. Making the crosslinked polyethylene insulation suitable for the insulation layer 23 of the cable.
The outer shielding layer 24 is coated on the periphery of the insulating layer 23, and the outer shielding layer 24 is made of a semi-conductive outer shielding material.
Wherein, the extruded inner shielding layer 22, the insulating layer 23 and the outer shielding layer 24 are extruded out simultaneously through a cross-linking production line, the outer surface of the inner shielding layer 21 is molded, and the cross-linking is completed in a cross-linking pipeline. Meanwhile, the extruded inner shielding layer 22, the insulating layer 23 and the outer shielding layer 24 are formed in a compact structure. The composite insulating layer 2 of the composite structure is excellent in shielding performance, insulation performance, and heat resistance, so that the conductor 1 can be kept insulated from the outside in a fire.
The water-blocking layer 3 is arranged on the periphery of the composite insulating layer 2, and the water-blocking layer 3 is formed by wrapping a semi-conductive buffer water-blocking tape on the periphery of the composite insulating layer 2. The semi-conductive water-blocking tape has a water-blocking function and a semi-conductive shielding function, and can further block water and semi-conductive shield the conductor 1 so as to ensure stable power transmission of the conductor 1.
The metal sheath layer 4 is coated on the periphery of the water resisting layer 3, and the metal sheath layer 4 is a corrugated copper pipe. The copper strips are welded into copper tubes through argon arc welding, and then the copper tubes are made into corrugated copper tubes through a rolling machine, and the corrugated copper tubes can be bent, are light in weight and are suitable for cables. In addition, the melting point of copper is 1083 ℃, and the fireproof performance is good. In addition, the compound insulating layer 2 of flame ablation cable inside can be blockked to the wrinkle copper pipe, and the copper has good heat conductivility, can prevent the heat dispersion transmission from appearing the heat and concentrate to prevent to damage the insulation of cable.
The heat insulation layer 5 is arranged on the periphery of the metal sheath layer 4, and the heat insulation layer 5 is made of ceramic silicon rubber materials. Specifically, the heat insulation layer 5 is extruded by a copper pipe rubber extruder containing a double-25 vulcanizing agent ceramic silicon rubber material and coated on the outer surface of the metal sheath for molding. The ceramic material is formed into a hard protective layer by crusting and forming at the high temperature of more than 350 ℃, and the formed ceramic material is in a honeycomb shape. When a fire disaster happens, the formed ceramic silicon rubber can block the flame outside the cable, and the nest-shaped small holes enable the heat insulation effect of the heat insulation layer 5 to be obvious, so that the internal structure of the cable is protected in the fire disaster, and the composite insulation layer 2 inside the cable is prevented from being damaged due to the fire disaster. And then, the vulcanized rubber material has high elasticity, heat resistance and tensile strength and is insoluble in an organic solvent by vulcanization treatment through a vulcanization pipe, so that the thermal insulation layer 5 has stable chemical properties and an obvious thermal insulation effect. The ceramic silicon rubber material has the characteristics of excellent fire resistance, flame retardance, low smoke, no toxicity and the like, the extrusion molding process is simple, residues after combustion are hard ceramic shells, and hard shells are not melted and dropped in a fire environment and are suitable for cables.
The metal fire-proof layer 6 is coated on the outer surface of the heat-insulating layer 5, and the metal fire-proof layer 6 is a corrugated stainless steel sheath. The stainless steel strip is welded into a stainless steel tube by a welding mode of somatosensory argon arc welding, and then is made into a corrugated stainless steel sheath by a rolling machine to be coated on the periphery of the heat insulation layer 5 so as to block flame outside the cable in a fire. The melting point of the stainless steel sheath is about 1400 ℃, and the stainless steel has stable property, so that the stainless steel sheath is not easy to melt in a fire, and the service life of the metal fireproof layer 6 is long.
The sheath layer 7 is arranged on the periphery of the metal fireproof layer 6, and the sheath layer 7 comprises an inner sheath 71 and an outer sheath 72. The outer sheath 72 and the inner sheath 71 are extrusion-molded by a tube extrusion die.
The inner sheath 71 is made of a ceramic polyolefin material. The ceramic material is formed into a hard protective layer by crusting and forming at the high temperature of more than 350 ℃, and the formed ceramic material is in a honeycomb shape. When a fire disaster happens, the hard ceramic polyolefin material after forming can block flame outside the cable, the heat insulation effect of the inner sheath 71 is obvious due to the socket-shaped small holes, and the inner structure of the cable can be protected by the inner sheath 71 in the fire disaster.
The outer sheath 72 is made of high-flame-retardant PVC materials, an electrode layer is further coated on the periphery of the outer sheath 72, and the electrode layer is made of graphite powder.
The working principle of the fire-resistant ultra-high voltage cable is as follows:
the utility model discloses be provided with metal flame retardant coating 6 and metal sheathing layer 4, can block the outside flame of cable when the conflagration breaing out to prevent that flame from burning out cable inner structure and influencing cable normal work. On the other hand, the water-resistant layer 3, the heat-insulating layer 5 and the sheath layer 7 are mutually matched, so that the heat-insulating property is excellent, the insulating property of the composite insulating layer 2 can be protected under the high-temperature environment of fire, and the cable can be kept in normal power transmission. In addition, the composite structure of the composite insulating layer 2 has fire resistance, and can effectively prevent the insulation of the cable from being damaged in case of fire, thereby ensuring normal power transmission in case of fire.
Other constructions of the fire-resistant ultra high voltage cable described in this example are known from the prior art.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any modification, equivalent change and modification made by the technical spirit of the present invention to the above embodiments do not depart from the technical solution of the present invention, and still fall within the scope of the technical solution of the present invention.
Claims (10)
1. A fire-resistant ultrahigh-voltage cable is characterized by comprising a conductor (1), a composite insulating layer (2), a water-resistant layer (3), a metal sheath layer (4), a heat-insulating layer (5), a metal fireproof layer (6) and a sheath layer (7) which are tightly coated from inside to outside in sequence;
the composite insulating layer (2) comprises a wrapping inner shielding layer (21), an extruding inner shielding layer (22), an insulating layer (23) and an outer shielding layer (24).
2. Fire-resistant ultra high voltage cable according to claim 1, characterized in that:
the conductor (1) is of a stranded conductor structure.
3. Fire-resistant extra-high voltage cable according to claim 2, characterized in that:
the conductor (1) is a compact round conductor structure.
4. Fire-resistant extra-high voltage cable according to claim 2, characterized in that:
the conductor (1) is a split conductor structure.
5. Fire-resistant ultra high voltage cable according to claim 1, characterized in that:
the metal fireproof layer (6) is a corrugated stainless steel copper sheath.
6. Fire-resistant ultra high voltage cable according to claim 1, characterized in that:
the sheath layer (7) comprises an inner sheath (71) and an outer sheath (72).
7. Fire-resistant extra-high voltage cable according to claim 6, characterized in that:
the inner sheath (71) is made of ceramic polyolefin material.
8. Fire-resistant extra-high voltage cable according to claim 6, characterized in that:
the outer sheath (72) is made of high-flame-retardant PVC material.
9. Fire-resistant ultra high voltage cable according to any of claims 1 to 8, characterized in that:
the water-blocking layer (3) is made of a semi-conductive buffering water-blocking tape.
10. Fire-resistant ultra high voltage cable according to any of claims 1 to 8, characterized in that:
the wrapping inner shielding layer (21) is made of one of a semi-conductive nylon tape and a semi-conductive Teflon tape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021045404.XU CN211957200U (en) | 2020-06-09 | 2020-06-09 | Fire-resistant ultrahigh-voltage cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021045404.XU CN211957200U (en) | 2020-06-09 | 2020-06-09 | Fire-resistant ultrahigh-voltage cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211957200U true CN211957200U (en) | 2020-11-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021045404.XU Active CN211957200U (en) | 2020-06-09 | 2020-06-09 | Fire-resistant ultrahigh-voltage cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211957200U (en) |
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2020
- 2020-06-09 CN CN202021045404.XU patent/CN211957200U/en active Active
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