CN203982861U - Low-smoke halogen-free flame retardant double hyer insulation fire-resisting cable for a kind of nucleus power station - Google Patents
Low-smoke halogen-free flame retardant double hyer insulation fire-resisting cable for a kind of nucleus power station Download PDFInfo
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- CN203982861U CN203982861U CN201420392075.4U CN201420392075U CN203982861U CN 203982861 U CN203982861 U CN 203982861U CN 201420392075 U CN201420392075 U CN 201420392075U CN 203982861 U CN203982861 U CN 203982861U
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Abstract
The utility model discloses a kind of nucleus power station low-smoke halogen-free flame retardant double hyer insulation fire-resisting cable, comprise conductor, flame retardant coating, insulating barrier, twining package tape, inner covering, braided overall-shielding layer and oversheath, described insulating barrier is two-layer, formed by inner insulating layer and external insulation layer, described inner insulating layer is crosslinked polyethylene, described external insulation layer is cross-linked polyolefin, and the thickness of described inner insulating layer is 0.05～0.3mm, and the thickness of described external insulation layer is 0.4～0.65mm.The utility model is in the time carrying out flame retardant coating around-packing technology, select the mica tape of two kinds of different sizes to carry out positive and negative wrapped, and adopt the high rate of putting up to guarantee the high efficiency of flame retardant coating, inner insulating layer adopts crosslinked polyethylene, the outer cross-linked polyolefin that adopts, meanwhile, also extrusion molding one deck high-performance inner covering, this structure has ensured the fire resistance of finished cable high-quality effectively, and fire resistance is good, and useful life is fine.
Description
Technical field
The utility model relates to field of cables, particularly relates to a kind of nucleus power station low-smoke halogen-free flame retardant double hyer insulation fire-resisting cable.
Background technology
For civilian nuclear facility project (comprising nuclear power station, nuclear tests heap etc.), used in nuclear power station fire-resisting cable has been proposed to very high combination property requirement, particularly in electric property, mechanical performance, fire-resistant and fire resistance, compare conventional fire-resisting cable, it is high a lot of that performance is wanted, and main performance requirements is as follows:
(1), when 90 DEG C of or maximum operating temperatures specified at cable, the normal service life of cable is more than 40 years.
(2) cable is by GB12666.6-90950～1000 degree fire resistance test.
(3) cable is by 3500V/5min, withstand voltage test after 8D bending.
(4) cable halogen acid gas is measured: pH value >=4.3, conductance≤10 μ s/mm, smoke density light transmittance >=70%.
(5) finished cable burning test is by IEC60332-3-23 and the single testing vertical flammability of IEC60332-1.
(6) 25Mrad of resistance to irradiation dose of cable.
At present, in the fire-resisting cable design and manufacture of China, synthetic mica is widely used, and this mica tape is except having the characteristic of natural mica band, and its main feature is that thermal endurance class is high.In conventional occasion, the fire-resisting cable being manufactured by this synthetic mica tape just can meet the demands.Used in nuclear power station low-smoke halogen-free flame retardant fire-resisting cable is different from the fire-resisting cable of 830 DEG C of general fire resistance ratings, product requirement not only meets IEC60754, IEC61034, IEC60332-1, IEC60332-3-23 low-smoke non-halogen flame-retardant performance but also requirement can be by 950～1000 DEG C of temperature grades, continue to supply the category-A fire resistance test that the fire time is 90min.Although the fire resistance rating of synthetic mica tape can reach 950 DEG C,, the manufacturing process of this mica tape is that synthetic mica is copied to the mica paper of making is main material, then with adhesive, glass cloth is sticked on to one or both sides and make.
In manufacture process, several layer of structure must be bonded together, in carrying out cables manufacturing or laying, just likely cause the layering of mica tape and come off.And existing used in nuclear power station low-smoke halogen-free flame retardant fire-resisting cable fire resistance is bad, and the life-span is shorter.
Summary of the invention
The utility model is in order to ensure the realization of above performance index, and overcomes the deficiency of above-mentioned technical problem, and a kind of nucleus power station low-smoke halogen-free flame retardant double hyer insulation fire-resisting cable is provided, and can solve the problems of the technologies described above completely.
The technical scheme solving the problems of the technologies described above is as follows:
Low-smoke halogen-free flame retardant double hyer insulation fire-resisting cable for a kind of nucleus power station, comprise conductor, flame retardant coating, insulating barrier, twining package tape, inner covering, braided overall-shielding layer and oversheath, described insulating barrier is two-layer, formed by inner insulating layer and external insulation layer, described inner insulating layer is crosslinked polyethylene, described external insulation layer is cross-linked polyolefin, and the thickness of described inner insulating layer is 0.05～0.3mm, and the thickness of described external insulation layer is 0.4～0.65mm.
Insulation is double hyer insulation, insulation adopts internal layer crosslinked polyethylene and outer cross-linked polyolefin, insulating material is internal layer crosslinked polyethylene and outer cross-linked polyolefin, adopt radiation mode to be cross-linked, ensure on the one hand the fire resistance of cable, strengthen again on the other hand the radiation-resistant property of cable, met the running environment requirement of cable in nuclear power station.The thickness of described inner insulating layer is 0.05～0.3mm, and the thickness of described external insulation layer is 0.4～0.65mm.Internal layer and outer insulation are added up and are met cable insulation layer thickness basic standard 0.7mm left and right.Because crosslinked polyethylene is to form with vinyl polymerization, comparatively speaking, composition is purer, in order to embody the electrical property of cable, to meeting the requirement of nuclear power cable; Outer cross-linked polyolefin, with the alpha-olefins such as ethene, propylene, 1-butylene, 1-amylene, 1-hexene, 1-octene, 4-methyl-1-pentene and the independent polymerization of some cycloolefin or combined polymerization and the analog thermoplastic resin obtaining, can ensure mechanical performance and the fire resistance of cable.Meanwhile, the mechanical performance of high-quality has also guaranteed that cable is standing in the Heat Ageing of 90 DEG C of conductor temperatures, the designed life of 40 years.When insulating exruded, adopt double-layer coextrusion technique, can effectively ensure the continuity of cloud surface layer, for ensureing by fire-resistant impulse withstand test.
Insulation property meet following requirement:
| Sequence number | Project | Unit | Requirement |
| 1 | Mechanical performance | ? | ? |
| 1.1 | Aging front mechanical performance | ? | ? |
| ? | Tensile strength >= | N/mm 2 | 9.0 |
| ? | Elongation at break >= | ％ | 120 |
| 1.2 | The aging rear mechanical performance of air-oven | ? | ? |
| ? | Aging temperature | ℃ | 110±2 |
| ? | Ageing time | h | 240 |
| ? | Tensile strength rate of change≤ | ％ | ±25 |
| ? | Elongation at break rate of change≤ | ％ | ±25 |
| 2 | Combustibility | ? | ? |
| 2.1 | Insulation is by single testing vertical flammability | ? | ? |
Further, select many circular tinned copper conductors, meet GB/T3956 bis-class stranded conductor requirements, and be concentric stranding, ensured that cable possesses certain flexibility, is convenient to lay.In technique, will prevent conductor jumping creek, conductor requires rounding, guarantees carrying out smoothly of rear road Mica tape technique.
Further, select a kind of novel mica band of calcinated type, this calcining mica tape by calcining muscovite paper, individual layer alkali-free glass fiber cloth is supporting material, close and form with high temperature resistant organic silicone adhesive, there is good withstand voltage properties, high-flexural strength acid and alkali-resistance, radioresistance, nontoxic, good flexibility, heatproof can reach more than 950 DEG C, meets the low smoke and zero halogen non-toxic nature requirement of nuclear power station requirement.Mica tape wants compact, docile layer by layer, and wrapped speed is well-balanced, and angle control is suitable, effectively avoids coming off of mica layer, guarantees the globality of flame retardant coating.
Performance meets following requirement:
| Sequence number | Project | Requirement |
| 1 | Muscovite paper | 125g/m 2 |
| 2 | Glass-fiber-fabric | 32g/m 2 |
| 3 | Volatile matter | ＜1％ |
| 4 | Heating loss | ≤13％ |
| 5 | Glue content | 23g/m 2 |
| 6 | Tensile strength | ≥70N/10mm |
| 7 | Puncture voltage | ≥2.0kV |
Further, the combustion characteristics of cable depends primarily on the performance of inner covering, not only needs to have very high oxygen index, also must possess good crust performance, the low-smoke bittern-free highly fire-proof oxygen barrier layer material of having selected a kind of oxygen index to be greater than 35.In extrusion, adopt plsitive mold to extrude, object is wrapped on cable core inner covering closely, has improved fire-retardant, fire-resistant impact resistance.Select and the guarantee of technique by above-mentioned material, cable is in the time testing, and crust performance is very superior, effectively ensures the skeleton structure of whole cable.
Further, the oversheath of cable not only will possess good fire resistance also must good mechanical performance, select thermoplastic low-smoke halide-free fireproof composite polyolefine material, this material has good crust performance in combustion process, in combustion process, can envelope cable to stop propagation of flame, guarantee that cable is by IEC60332-3-23B class bunched burning test.Meanwhile, cable also must carry out cross-linking radiation after sheathing, to ensure the radiation-resistant property of cable.In addition, good mechanical performance has also ensured cable designed life of 40 years to meet the requirement of cable for nuclear power station.
The utility model is in the time carrying out flame retardant coating around-packing technology, select the mica tape of two kinds of different sizes to carry out positive and negative wrapped, and adopt the high rate of putting up to guarantee the high efficiency of flame retardant coating, inner insulating layer adopts crosslinked polyethylene, the outer cross-linked polyolefin that adopts, meanwhile, also extrusion molding one deck high-performance inner covering, this structure has ensured the fire resistance of finished cable high-quality effectively, and fire resistance is good, and useful life is fine.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is structural representation of the present utility model;
In figure, 1 is conductor, and 2 is flame retardant coating, and 3 is insulating barrier, and 4 is twining package tape, and 5 is inner covering, and 6 is braided overall-shielding, and 7 is oversheath, and 8 is inner insulating layer, and 9 is external insulation layer.
Embodiment
Low-smoke halogen-free flame retardant double hyer insulation fire-resisting cable for a kind of nucleus power station as shown in Figure 1, comprise conductor 1, flame retardant coating 2, insulating barrier 3, twining package tape 4, inner covering 5, braided overall-shielding layer 6 and oversheath 7, described insulating barrier 3 is two-layer, formed by inner insulating layer 8 and external insulation layer 9, described inner insulating layer 8 is crosslinked polyethylene, described external insulation layer 9 is cross-linked polyolefin, the thickness of described inner insulating layer 8 is 0.05～0.3mm, and the thickness of described external insulation layer 9 is 0.4～0.65mm.Described conductor 1 is many circular tinned copper conductor concentric stranding structures.Described flame retardant coating 2 is calcinated type mica tape, and described calcinated type mica tape is bonding by organic silica gel by calcining muscovite paper and individual layer alkali-free glass fiber cloth.The low-smoke bittern-free highly fire-proof oxygen barrier layer material that described inner covering 5 is greater than 35 for oxygen index.Described oversheath 7 is thermoplastic low-smoke halide-free fireproof composite polyolefine material.
Claims (5)
1. a low-smoke halogen-free flame retardant double hyer insulation fire-resisting cable for nucleus power station, comprise conductor, flame retardant coating, insulating barrier, twining package tape, inner covering, braided overall-shielding layer and oversheath, it is characterized in that, described insulating barrier is two-layer, be made up of inner insulating layer and external insulation layer, described inner insulating layer is crosslinked polyethylene, and described external insulation layer is cross-linked polyolefin, the thickness of described inner insulating layer is 0.05～0.3mm, and the thickness of described external insulation layer is 0.4～0.65mm.
2. low-smoke halogen-free flame retardant double hyer insulation fire-resisting cable for a kind of nucleus according to claim 1 power station, is characterized in that, described conductor is many circular tinned copper conductor concentric stranding structures.
3. low-smoke halogen-free flame retardant double hyer insulation fire-resisting cable for a kind of nucleus according to claim 1 power station, it is characterized in that, described flame retardant coating is calcinated type mica tape, and described calcinated type mica tape is bonding by organic silica gel by calcining muscovite paper and individual layer alkali-free glass fiber cloth.
4. low-smoke halogen-free flame retardant double hyer insulation fire-resisting cable for a kind of nucleus according to claim 1 power station, is characterized in that, described inner covering is the low-smoke bittern-free highly fire-proof oxygen barrier layer material that oxygen index is greater than 35.
5. low-smoke halogen-free flame retardant double hyer insulation fire-resisting cable for a kind of nucleus according to claim 1 power station, is characterized in that, described oversheath is thermoplastic low-smoke halide-free fireproof composite polyolefine material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420392075.4U CN203982861U (en) | 2014-07-15 | 2014-07-15 | Low-smoke halogen-free flame retardant double hyer insulation fire-resisting cable for a kind of nucleus power station |
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|---|---|---|---|
| CN201420392075.4U CN203982861U (en) | 2014-07-15 | 2014-07-15 | Low-smoke halogen-free flame retardant double hyer insulation fire-resisting cable for a kind of nucleus power station |
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| CN203982861U true CN203982861U (en) | 2014-12-03 |
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| CN201420392075.4U Expired - Fee Related CN203982861U (en) | 2014-07-15 | 2014-07-15 | Low-smoke halogen-free flame retardant double hyer insulation fire-resisting cable for a kind of nucleus power station |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104464924A (en) * | 2014-12-17 | 2015-03-25 | 常州八益电缆股份有限公司 | Novel high-dose-irradiation-resistant cable structure used in nuclear power plant containment vessel |
| CN104505156A (en) * | 2014-12-17 | 2015-04-08 | 常州八益电缆股份有限公司 | Cable used in containment of CAP1400 large pressurized water reactor nuclear power station |
| CN105304167A (en) * | 2015-11-03 | 2016-02-03 | 昆明电立电缆有限公司 | Long-life double-layer wire and manufacturing method thereof |
| CN107424681A (en) * | 2017-09-07 | 2017-12-01 | 兰州众邦电线电缆集团有限公司 | A kind of single-phase cellular-type concentric cable of LSOH anti-flaming fire safe type |
| CN110060802A (en) * | 2019-04-09 | 2019-07-26 | 南京全信传输科技股份有限公司 | A kind of fire resisting data bus cable of the flame retardant coating containing mica |
| CN117219329A (en) * | 2022-10-13 | 2023-12-12 | 四川蓝电电缆科技有限公司 | Double-layer plastic combined insulation B1-level cable and manufacturing method thereof |
-
2014
- 2014-07-15 CN CN201420392075.4U patent/CN203982861U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104464924A (en) * | 2014-12-17 | 2015-03-25 | 常州八益电缆股份有限公司 | Novel high-dose-irradiation-resistant cable structure used in nuclear power plant containment vessel |
| CN104505156A (en) * | 2014-12-17 | 2015-04-08 | 常州八益电缆股份有限公司 | Cable used in containment of CAP1400 large pressurized water reactor nuclear power station |
| CN105304167A (en) * | 2015-11-03 | 2016-02-03 | 昆明电立电缆有限公司 | Long-life double-layer wire and manufacturing method thereof |
| CN107424681A (en) * | 2017-09-07 | 2017-12-01 | 兰州众邦电线电缆集团有限公司 | A kind of single-phase cellular-type concentric cable of LSOH anti-flaming fire safe type |
| CN110060802A (en) * | 2019-04-09 | 2019-07-26 | 南京全信传输科技股份有限公司 | A kind of fire resisting data bus cable of the flame retardant coating containing mica |
| CN117219329A (en) * | 2022-10-13 | 2023-12-12 | 四川蓝电电缆科技有限公司 | Double-layer plastic combined insulation B1-level cable and manufacturing method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141203 Termination date: 20200715 |