CN217767941U - Ceramic incrustation sheath 10kV fireproof cable - Google Patents
Ceramic incrustation sheath 10kV fireproof cable Download PDFInfo
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- CN217767941U CN217767941U CN202221277259.7U CN202221277259U CN217767941U CN 217767941 U CN217767941 U CN 217767941U CN 202221277259 U CN202221277259 U CN 202221277259U CN 217767941 U CN217767941 U CN 217767941U
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- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
Abstract
A pottery incrustation sheath 10kV fireproof cable, its structure is: a cable core is formed by stranding a plurality of wire cores and a non-combustible filling material; the cable core is sequentially wrapped with a first wrapping layer, a heat insulation layer, a fireproof layer, a second wrapping layer, an armor layer, a third wrapping layer and an outer sheath from inside to outside; the wire core is formed by sequentially wrapping a conductor shielding layer, an insulating layer and an insulating shielding layer outside a conductor; the first wrapping layer is formed by wrapping a low-smoke halogen-free high-flame-retardant cloth tape; the heat insulation layer is made of low-smoke halogen-free polyolefin material; the fire-resistant layer is made of ceramic fire-resistant polyolefin material; the second wrapping layer is formed by wrapping a high-flame-retardant strip material; the armor layer is wrapped outside the fire-resistant layer by metal band gaps; the third wrapping layer is formed by wrapping high-flame-retardant belt materials; the outer sheath is made of low-smoke halogen-free high-flame-retardant polyolefin sheath material. The cable passes through the covering around the sinle silk outside, the flame retardant coating of thermal-insulated layer and pottery on the cable core for when the cable is heated, reduce outside heat to the insulating layer influence by a wide margin.
Description
Technical Field
The technical scheme belongs to the technical field of cables, and particularly relates to a ceramic crust-forming protective layer 10kV fire-resistant cable.
Background
The medium-voltage fire-resistant cable is widely applied to various fire-fighting power supply systems and is mainly used in places such as building engineering, tunnel engineering and the like, the places have high requirements on the performance of the cable, but the high-voltage fire-resistant cable has poor fire resistance due to thick insulation thickness, and the use of the cable is influenced.
Disclosure of Invention
In order to improve the fire resistance of a high-voltage-grade cable, the invention provides a ceramic crust protective layer 10kV fire-resistant cable structure, which reduces the temperature of a wire core and improves the fire resistance of the cable through a multiple fire-resistant structure design. Specifically, the method comprises the following steps:
a pottery incrustation sheath 10kV fireproof cable, its structure is: a cable core is formed by stranding a plurality of wire cores and a non-combustible filling material;
the cable core is sequentially wrapped with a first wrapping layer 8, a heat insulation layer 9, a fire-resistant layer 10, a second wrapping layer 11, an armor layer 12, a third wrapping layer 13 and an outer sheath 14 from inside to outside;
the wire core is formed by sequentially wrapping a conductor shielding layer 2, an insulating layer 3 and an insulating shielding layer 4 outside a conductor 1;
the first wrapping layer 8 is formed by wrapping a low-smoke halogen-free high-flame-retardant cloth tape;
the heat insulation layer 9 is made of low-smoke halogen-free polyolefin material;
the fire-resistant layer 10 is made of ceramic fire-resistant polyolefin material;
the second wrapping layer 11 is formed by wrapping a high-flame-retardant strip material;
the armor layer 12 is wrapped outside the refractory layer by metal band gaps;
the third wrapping layer 13 is formed by wrapping a high-flame-retardant strip material;
the outer sheath is made of low-smoke halogen-free high-flame-retardant polyolefin sheath material.
The cable with the structure is particularly suitable for the cross section area of 35-630mm 2 The copper conductor of (1).
And further: the conductor shielding layer 2, the insulating layer 3 and the insulating shielding layer 4 are of a three-layer co-extrusion structure;
the thickness of the conductor shield is 0.6-0.9 mm, the thickness of the insulating layer is 4.2-4.7 mm, and the thickness of the insulating shield is 0.5-0.8 mm;
the cable material of the conductor shielding layer is a peroxide crosslinking type semi-conductive shield, the cable material of the insulating layer is peroxide crosslinking polyethylene, and the cable material of the insulating shielding layer is a peroxide crosslinking type semi-conductive shield;
further: a wire core wrapping layer and a wrapping copper strip are sequentially wrapped outside the wire core from inside to outside; the wire core wrapping layer is two layers, namely an inner semi-conductive Teflon tape wrapping layer and an outer semi-conductive water-blocking tape wrapping layer.
The method specifically comprises the following steps: the back degree of the semi-conductive Teflon tape is 0.15-0.25mm, and the thickness of the semi-conductive waterproof tape is 0.2-0.35 mm; the covering rate of the semi-conductive Teflon tape and the semi-conductive water-blocking tape is 15-25%; in the lapping copper strip, the thickness of the copper strip is 0.09-0.10 mm, and the lapping rate is not less than 15%.
The sinle silk has semiconduction characteristic and the characteristic of blocking water around the covering, plays the cushioning effect. The semi-conductive Teflon tape is heated and then bonded with the melted cable material of the insulation shielding layer, so that the stability of the insulation structure of the cable can be ensured. The wrapping copper strip has a shielding effect and also has an armor protection function.
And further: the cabling pitch-diameter ratio of the cable core formed by stranding a plurality of cable cores and the non-combustible filling material is as follows: 25 to 35.
Further: the noncombustible filling material is a glass fiber rope 7; the diameter of the glass fiber rope is 5.5-6.5 mm;
the thickness of the low-smoke halogen-free high-flame-retardant cloth tape of the first wrapping layer 8 is 0.2-0.3 mm, and the covering rate is not less than 5%;
the heat insulation layer 9 is formed by extruding and wrapping low-smoke halogen-free polyolefin material, and the nominal thickness of the heat insulation layer is 2.0-4.0 mm;
the nominal thickness of the refractory layer 10 is 3.2-6.0 mm;
the metal belt of the armor layer 12 is a galvanized steel belt, and the clearance rate of clearance lapping is not more than 50%;
the nominal thickness of the high flame-retardant strips of the second wrapping layer 11 and the third wrapping layer 13 is 0.2-0.3 mm, and the covering rate is 15-25%.
The nominal thickness of the outer sheath is 2.0-4.9 mm.
Further: in the first covering 8, the number of layers of the low-smoke halogen-free high-flame-retardant cloth tape is 2, and the thickness of the low-smoke halogen-free high-flame-retardant cloth tape on two sides and the covering rate of the covering are the same.
During this cable burning, low smoke and zero halogen high flame retardant polyolefin oversheath at first contacts flame, because its excellent flame retardant property, reduce stretching of flame, after the oversheath burns out, the pottery polyolefin flame retardant coating is owing to the high temperature of burning ceramic gradually, prevents the burning of flame, the inside infiltration of past cable of separation high temperature simultaneously, the inside low smoke and zero halogen heat insulating layer of pottery polyolefin is receiving after the heat after the flame retardant coating cuts down, further decompose and reduce the inside temperature of cable core.
The cable core is easy to deform after being subjected to only a small amount of heat, so that the normal electrifying performance of the cable is influenced, and at the moment, the semi-conductive super-hose and the semi-conductive water blocking tape outside the cable core can maintain the stability and the non-deformation of the insulating structure, so that the fire resistance of the cable is ensured.
Specifically, the method comprises the following steps: the incombustible filling material is an incombustible glass fiber rope, the outer diameter of a single glass fiber rope is 6mm, and the sides and the center of the cable core are both tightly filled.
The heat insulation layer is made of low-smoke halogen-free polyolefin materials, the nominal thickness of the heat insulation layer is 2.0-4.0 mm, and the thickness of the thinnest point is not smaller than 80-0.2 mm of the nominal value. The fire-resistant layer is composed of halogen-free low-smoke ceramic polyolefin, the nominal thickness of the fire-resistant layer is 3.2-6.0 mm, the average thickness is not less than the nominal value, and the thinnest point thickness is not less than 80-0.2 mm of the nominal value.
After the refractory layer is heated, organic matters in the internal material are completely decomposed, the edge of the residual inorganic ceramic filler is melted at high temperature to generate a liquid phase, gaps among particles are filled up along with the expansion of the liquid phase, all filler particles are bonded together, and therefore, the higher the temperature is, the longer the time is, the more compact and hard the ceramic shell is, and the more excellent the fire resistance of the cable is.
The armor layer 12 is a galvanized steel strip double-layer gap armor, the nominal thickness of the galvanized steel strip is 0.5mm, and the gap rate is 40-45%.
In the cable structure, the high-strength semi-conductive Teflon tape outside the wire core is bonded with the melted insulation shield after being heated, so that the stability of the insulation structure can be ensured when the cable is heated; the heat insulation layer is arranged in the fire-resistant layer, so that the fire-resistant layer can be further decomposed when being heated, and the internal temperature of the cable core can be reduced; the ceramic polyolefin material is adopted, so that a compact and hard ceramic shell can be formed at high temperature, and the fire resistance of the cable is more excellent.
This cable structural design has reduced around the protruding thickness of covering department on the basis of having guaranteed the mechanical properties and the electric property of cable, and then reduces the stress concentration of oversheath in covering department around the package, improves the oversheath and the compactness around the package strip, promotes fluoroplastics oversheath anti-cracking performance.
On this cable structure design had guaranteed the mechanical properties and the electric property's of cable basis, set up multiple fire resistive construction, when catching fire, reduced the cable core temperature, when normal during operation, do not influence the cable heat dissipation. The fire resistance of the cable is improved.
Drawings
FIG. 1 is a schematic radial cross-sectional view of the cable of this example;
in the figure: conductor 1, conductor shield 2, XLPE insulating layer 3, insulation shield 4, sinle silk are around covering 5, copper strips 6, fine rope 7 of glass, first around covering 8, thermal insulation layer 9, flame retardant coating 10, second around covering 11, armor 12, third around covering 13, oversheath 14.
Detailed Description
The technical scheme is further explained by combining the drawings and the detailed implementation mode as follows:
the utility model discloses a pottery crust sheath 10kV fire resisting cable, its structure is: the three layers of the co-extruded conductor shield, the insulation and the insulation shield outside the conductor form a wire core; wrapping a semi-conductive strip outside the wire core and then wrapping a copper strip; the three wire cores and the non-combustible filling are jointly stranded to form a cable core; the cable core is externally extruded with a heat insulation layer; a ceramic fire-resistant polyolefin material is extruded outside the heat insulation layer to serve as a fire-resistant layer; the armor layer is wound on the fire-resistant layer in a clearance wrapping mode, and meanwhile high-flame-retardant strips are wound on the inner layer and the outer layer of the armor; the outer sheath is extruded low-smoke halogen-free high-flame-retardant polyolefin material.
In particular to the present example, with reference to figure 1,
a pottery incrustation sheath 10kV fireproof cable, its structure is: a plurality of (3 in the example) wire cores and the incombustible filling material are twisted to form a cable core;
the cable core is sequentially wrapped with a first wrapping layer 8, a heat insulation layer 9, a fire-resistant layer 10, a second wrapping layer 11, an armor layer 12, a third wrapping layer 13 and an outer sheath 14 from inside to outside;
the wire core is formed by sequentially wrapping a conductor shielding layer 2, an insulating layer 3 and an insulating shielding layer 4 outside a conductor 1;
the first wrapping layer 8 is formed by wrapping a low-smoke halogen-free high-flame-retardant cloth belt;
the heat insulation layer 9 is made of low-smoke halogen-free polyolefin material;
the fire-resistant layer 10 is made of ceramic fire-resistant polyolefin material (in this example, the ceramic low-smoke halogen-free polyolefin fire-resistant material TCPE 6990 made by Shanghai Kort New Material Co., ltd.) is adopted;
the second wrapping layer 11 is formed by wrapping a high-flame-retardant strip material;
the armor layer 12 is wrapped outside the refractory layer by metal band gaps;
the third wrapping layer 13 is formed by wrapping a high-flame-retardant strip material;
the outer sheath is made of a low-smoke halogen-free high-flame-retardant polyolefin sheath material (in this example, a low-smoke halogen-free high-flame-retardant polyolefin sheath material HW461-9 of a special cable material factory in Asia east of Linhai City can be adopted).
The cross section area of the conductor is 35-630mm 2 。
In the implementation:
the conductor shielding layer 2, the insulating layer 3 and the insulating shielding layer 4 are of a three-layer co-extrusion structure; the thickness of the conductor shield is 0.6-0.9 mm, the thickness of the insulating layer is 4.2-4.7 mm, and the thickness of the insulating shield is 0.5-0.8 mm;
the cable material of the conductor shielding layer is a peroxide crosslinking type semi-conductive shield (in the example, the semi-conductive shielding material YPJ-10 for a 10kV chemical crosslinking cable of Hippon river high polymer materials Co., ltd.) can be adopted, the cable material of the insulating layer is peroxide crosslinking polyethylene (in the example, the 10kV crosslinking polyethylene insulating material YJ-10 of Zhejiang Wanma high polymer materials Co., ltd.) can be adopted, and the cable material of the insulating shielding layer is a peroxide crosslinking type semi-conductive shield (in the example, the semi-conductive shielding material YPB-10 for a 10kV chemical crosslinking cable of Hippon river high polymer materials Co., ltd.) can be adopted;
in order to improve the performance of the cable, a wire core wrapping layer and a wrapping copper strip are sequentially wrapped outside the wire core from inside to outside; the wire core wrapping layer is two layers, namely an inner semi-conductive Teflon tape wrapping layer and an outer semi-conductive water-blocking tape wrapping layer. The back degree of the semi-conductive Teflon tape is 0.15-0.25mm, and the thickness of the semi-conductive waterproof tape is 0.2-0.35 mm; the covering rate of the semi-conductive Teflon tape and the semi-conductive water-blocking tape is 15-25%; in the lapping copper strip, the thickness of the copper strip is 0.09-0.10 mm, and the lapping rate is not less than 15%.
The cabling pitch-diameter ratio of the cable core formed by stranding a plurality of cable cores and the non-combustible filling material is as follows: 25 to 35.
The noncombustible filling material is a glass fiber rope 7; the diameter of the glass fiber rope is 5.5-6.5 mm;
the thickness of the low-smoke halogen-free high-flame-retardant cloth tape of the first wrapping layer 8 is 0.2-0.3 mm, and the covering rate is not less than 5%;
the heat insulation layer 9 is formed by extruding and wrapping low-smoke halogen-free polyolefin material, and the nominal thickness of the heat insulation layer is 2.0-4.0 mm;
the nominal thickness of the refractory layer 10 is 3.2-6.0 mm;
the metal belt of the armor layer 12 is a galvanized steel belt, and the clearance rate of clearance lapping is not more than 50%;
the nominal thickness of the high flame retardant belt material (in this example, shenyang Convergence cable material manufacturing limited low smoke halogen-free high flame retardant cloth belt) of the second wrapping layer 11 and the third wrapping layer 13 is 0.2-0.3 mm, and the covering rate is 15-25%.
The nominal thickness of the outer sheath is 2.0-4.9 mm.
And more preferably: in the first covering 8, the low smoke and zero halogen high flame retardant strap number of piles is 2, and the thickness of both sides low smoke and zero halogen high flame retardant strap and covering rate all the same around the package. The outer diameter of a single glass fiber rope is 6mm, and the sides and the center of the cable core are tightly filled. The armor layer 12 is a galvanized steel strip double-layer gap armor, the nominal thickness of the galvanized steel strip is 0.5mm, and the gap rate is 40-45%.
The semi-conductive super-heavy hose and the semi-conductive water-blocking tape are wrapped by concentric wrapping equipment; the heat insulation layer is made of low-smoke halogen-free polyolefin materials by adopting an extrusion process, so that the cable is less in falling off during combustion and stable in structure. The fire-resistant layer is made of halogen-free low-smoke ceramic polyolefin material by adopting an extrusion tube type process; the outer sheath is made of low-smoke halogen-free high-flame-retardant polyolefin material and is produced by adopting an extruded tube type process.
The conductor 1 is preferably a bare copper conductor of the second type, the ratio of the pitch diameter of the outer layer of the conductor is in a range of 10 to 15, and the ratio of the pitch diameter of each layer except the outer layer is in a range of 15 to 25.
The wire core outer wrapping layer is a semi-conductive Teflon tape and a semi-conductive water-blocking tape, the thickness of the wire core outer wrapping layer is 0.2-0.35 mm, and the lapping rate is 15% -25%.
The cable sets up multiple fire prevention structure, when catching fire, reduces the cable core temperature, keeps insulation system stable. The fire resistance of the cable is improved.
The detection conditions of the cable in this example are:
the flame temperature was 950 ℃ and the nominal cable voltage U was applied to the test specimens for the entire test duration (180 min) 0 Not breaking down, checking the integrity of the sample within 1 hour after the test is finished, and applying 3.5U to the sample under the condition of keeping the original state of the test 0 The test voltage of (2) was not broken down for 15 min.
Claims (10)
1. A pottery crust sheath 10kV fireproof cable, characterized by structure is: a cable core is formed by stranding a plurality of wire cores and a non-combustible filling material;
the cable core is sequentially wrapped with a first wrapping layer, a heat insulation layer, a fireproof layer, a second wrapping layer, an armor layer, a third wrapping layer and an outer sheath from inside to outside;
the wire core is formed by sequentially wrapping a conductor shielding layer, an insulating layer and an insulating shielding layer outside a conductor;
the first wrapping layer is formed by wrapping a low-smoke halogen-free high-flame-retardant cloth tape;
the heat insulation layer is made of low-smoke halogen-free polyolefin material;
the fire-resistant layer is made of ceramic fire-resistant polyolefin material;
the second wrapping layer is formed by wrapping a high-flame-retardant strip material;
the armor layer is wrapped outside the refractory layer by metal belt gaps;
the third wrapping layer is formed by wrapping a high-flame-retardant strip material;
the outer sheath is made of low-smoke halogen-free high-flame-retardant polyolefin sheath material.
2. The ceramized encrusted sheath 10kV fire-resistant cable according to claim 1, wherein the cross-sectional area of the conductor is 35-630mm 2 。
3. The ceramic crust-covering 10kV fire-resistant cable according to claim 1, wherein the conductor shielding layer, the insulating layer and the insulating shielding layer are of a three-layer co-extrusion structure;
the thickness of the conductor shield is 0.6-0.9 mm, the thickness of the insulating layer is 4.2-4.7 mm, and the thickness of the insulating shield is 0.5-0.8 mm;
the cable material of the conductor shielding layer is peroxide crosslinking type semi-conductive shielding, the cable material of the insulating layer is peroxide crosslinking polyethylene, and the cable material of the insulating shielding layer is peroxide crosslinking type semi-conductive shielding.
4. The 10kV fireproof ceramic sheathed cable according to claim 1, wherein the core is sequentially wrapped with a core wrapping layer and a wrapping copper strip from inside to outside; the wire core wrapping layer is two layers, namely an inner semi-conductive Teflon tape wrapping layer and an outer semi-conductive water-blocking tape wrapping layer.
5. The ceramic crust-protecting layer 10kV fire-resistant cable according to claim 4, wherein the semi-conductive Teflon tape has a degree of rearness of 0.15-0.25mm and a thickness of 0.2-0.35 mm; the covering rate of the semi-conductive Teflon tape and the semi-conductive water-blocking tape is 15-25%;
in the lapping copper strip, the thickness of the copper strip is 0.09-0.10 mm, and the lapping rate is not less than 15%.
6. The ceramic incrustation sheath 10kV fireproof cable according to claim 1 or 2, wherein the cable pitch ratio of the cable core formed by stranding a plurality of wire cores and the noncombustible filling material is as follows: 25 to 35.
7. The ceramic crust sheath 10kV fire-resistant cable according to claim 1 or 2, wherein the noncombustible filler material is glass fiber rope; the diameter of the glass fiber rope is 5.5-6.5 mm;
the thickness of the low-smoke halogen-free high-flame-retardant cloth tape of the first wrapping layer is 0.2-0.3 mm, and the covering rate is not less than 5%;
the heat insulation layer is formed by extruding and wrapping low-smoke halogen-free polyolefin material, and the nominal thickness of the heat insulation layer is 2.0-4.0 mm;
the nominal thickness of the fire-resistant layer is 3.2-6.0 mm;
the metal belt of the armor layer is a galvanized steel belt, and the clearance rate of clearance lapping is not more than 50%;
the nominal thickness of the high-flame-retardant strip materials of the second wrapping layer and the third wrapping layer is 0.2-0.3 mm, and the covering rate is 15% -25%;
the nominal thickness of the outer sheath is 2.0-4.9 mm.
8. The ceramic incrustation sheath 10kV fire-resistant cable according to claim 7, wherein in the first wrapping layer, the number of the low-smoke halogen-free high-flame-retardant cloth tapes is 2, and the thickness and the wrapping coverage rate of the low-smoke halogen-free high-flame-retardant cloth tapes on two sides are the same.
9. The 10kV fire-resistant cable with the ceramic encrustation sheath as claimed in claim 7, wherein the outer diameter of a single glass fiber rope is 6mm, and the sides and the center of the cable core are tightly filled.
10. The ceramic encrusted sheath 10kV fire-resistant cable according to claim 1 or 2, wherein the armor layer is a galvanized steel strip double-layer gap armor, the nominal thickness of the galvanized steel strip is 0.5mm, and the gap ratio is 40-45%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221277259.7U CN217767941U (en) | 2022-05-26 | 2022-05-26 | Ceramic incrustation sheath 10kV fireproof cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221277259.7U CN217767941U (en) | 2022-05-26 | 2022-05-26 | Ceramic incrustation sheath 10kV fireproof cable |
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| CN217767941U true CN217767941U (en) | 2022-11-08 |
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| CN202221277259.7U Active CN217767941U (en) | 2022-05-26 | 2022-05-26 | Ceramic incrustation sheath 10kV fireproof cable |
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