CN101556848A - Fabricating method of cable insulated layer - Google Patents
Fabricating method of cable insulated layer Download PDFInfo
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- CN101556848A CN101556848A CNA2008100233735A CN200810023373A CN101556848A CN 101556848 A CN101556848 A CN 101556848A CN A2008100233735 A CNA2008100233735 A CN A2008100233735A CN 200810023373 A CN200810023373 A CN 200810023373A CN 101556848 A CN101556848 A CN 101556848A
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Abstract
The invention relates to the field of insulated cable fabrication, in particular to a fabricating method of a cable insulated layer. Low-smoke and zero-halogen crosslinked polyethylene insulated material is used as the material of an internal layer, low-smoke and zero-halogen flame-retardant crosslinked polyolefine insulated material is used as the material of an external layer, and the internal layer and the external layer are together extruded out by utilizing two plastic extruding devices. The cable insulated layer produced by the method can meet the requirements of a civil nuclear facility project on fire resistance, electric property, mechanical property, irradiation resistance and long service life property.
Description
Technical field:
The present invention relates to the cables manufacturing field, is the manufacture method of cable insulation specifically.
Background technology:
Civilian nuclear facility project (comprising nuclear power station, nuclear tests heap etc.) has proposed very high performance requirement to cable insulation, and is specific as follows:
1. at cable during 90 ℃ of specified or maximum operating temperatures, be more than 60 years the normal useful life of cable.
2. insulating barrier has high flame resistance, by the requirement of the single insulated wire cores vertical combustion of IEC 60332-1.Burning back requires: do not burn distance greater than 50mm, the dropping cotton of not igniting.
3. insulating barrier has high-mechanical property, aging before minimum tensile strength be 9.0MPa, aging before minimum elongation at break be 200%, through behind 135 ± 3 ℃ and the 240h oven ageing, the maximum rate of change of tensile strength and elongation at break is ± 25%.
4. insulating barrier has high electrical property, and the minimum insulation resistance constant is 3670M Ω .km in the time of 20 ℃, and the minimum insulation resistance constant is 36.7M Ω .km in the time of 60 ℃, and the minimum insulation resistance constant is 3.67M Ω .km in the time of 90 ℃.
5. insulating barrier has low cigarette characteristic, and by IEC 61034 tests, light transmittance is not less than 70%.
6. insulating barrier has the Halogen characteristic, satisfies IEC 60754-1 and IEC 60754-2 requirement, and halogen content is not more than 5mg/g, and the pH value is not less than 4.3, and conductivity is not more than 10 μ S/mm.
7. insulating barrier has the Co60 radiation-resistant property of dosage 25Mrad.
8. insulating barrier should satisfy the NES713 requirement, poison exponent≤2.5.
9. insulating barrier should be by water absorption test, and (85 ℃, 336h) tests according to gravimetric method, and maximum water absorption rate is 5mg/cm2, and (800V, 70 ℃, 240h) tests according to voltage method, do not puncture.
10. insulating barrier should pass through heat shrinkage test, and through behind 130 ℃, 1h, percent thermal shrinkage is not more than 4%.
The cable that adopts conventional single manufacturing technology of insulating layer to produce, its fire resistance, electric property and radioresistance can satisfy above-mentioned requirements simultaneously, when being applied on the nuclear facility, cause short circuit easily, the accident rate height.And radiation hardness not, the life-span is less than 40 years.
Summary of the invention
Deficiency at existing cable insulation production method, the object of the present invention is to provide a kind of manufacture method of cable insulation, the cable insulation that uses this method to produce can satisfy civilian nuclear facility project to cable insulation fire resistance, electric property, mechanical performance, radiation-resistant property, long term life performance demands.
For achieving the above object, technical scheme of the present invention is as follows:
The manufacture method of cable insulation selects the low smoke and zero halogen cross-linked polyethylene insulating material as inner layer material, and low-smoke non-halogen flame-retardant cross-linked polyolefin Insulation Material utilizes two extrusion apparatus that ectonexine is extruded jointly as cladding material simultaneously.
Further, described interior layer thickness≤0.2 millimeter, interior layer thickness is less than 50% of total thickness of insulating layer.
Described inside and outside layer material meets following requirement:
Life-span 〉=60 year;
Co with dosage 25Mrad
60Radiation-resistant property;
Satisfy the NES713 requirement, poison exponent≤2.5;
Under 135 ± 2 ℃ of temperature, 240 hours aging.
The insulation specific insulation of described inner layer material under 1kV, 20 ℃ of conditions 〉=1 * 10
16Ω cm, cladding material is by the requirement of the single insulated wire cores vertical combustion of IEC 60332-1.
The invention has the beneficial effects as follows: the cable insulation that uses this method to produce can satisfy civilian nuclear facility project to cable insulation fire resistance, electric property, mechanical performance, radiation-resistant property and long term life performance demands.
Description of drawings
Fig. 1 is the structural representation of cable insulation among the present invention.Among the figure, 1 is conductor wire core, and 2 is the insulating barrier internal layer, and 3 is the insulating barrier skin.
Embodiment
Below in conjunction with description of drawings the specific embodiment of the present invention:
Execution mode one: select the material of low smoke and zero halogen cross-linked polyethylene insulating material as insulating barrier internal layer 2, low-smoke non-halogen flame-retardant cross-linked polyolefin Insulation Material is as the material of insulating barrier skin 3, and inside and outside layer material performance meets following requirement:
Life-span 〉=60 year;
Co with dosage 25Mrad
60Radiation-resistant property;
Satisfy the NES713 requirement, poison exponent≤2.5;
Under 135 ± 2 ℃ of temperature, 240 hours aging.
In addition, the insulation specific insulation of inner layer material under 1kV, 20 ℃ of conditions 〉=1 * 10
16Ω cm, cladding material is by the requirement of the single insulated wire cores vertical combustion of IEC 60332-1.
The ectonexine material that will meet above-mentioned requirements is extruded simultaneously with two extruders, is extruded on the conductor wire core 1.Layer thickness is 0.2mm in the control, and outer layer thickness is 0.3mm.
Execution mode two: select the material of low smoke and zero halogen cross-linked polyethylene insulating material as insulating barrier internal layer 2, low-smoke non-halogen flame-retardant cross-linked polyolefin Insulation Material is as the material of insulating barrier skin 3, and inside and outside layer material performance meets following requirement:
Life-span 〉=60 year;
Co with dosage 25Mrad
60Radiation-resistant property;
Satisfy the NES713 requirement, poison exponent≤2.5;
Under 135 ± 2 ℃ of temperature, 240 hours aging.
In addition, the insulation specific insulation of inner layer material under 1kV, 20 ℃ of conditions 〉=1 * 10
16Ω cm, cladding material is by the requirement of the single insulated wire cores vertical combustion of IEC 60332-1.
The ectonexine material that will meet above-mentioned requirements is extruded simultaneously with two extruders, is extruded on the conductor wire core 1.Layer thickness is 0.1mm in the control insulating barrier, and outer layer thickness is 0.5mm.
Claims (4)
1, the manufacture method of cable insulation, it is characterized in that: select the material of low smoke and zero halogen cross-linked polyethylene insulating material as the insulating barrier internal layer, low-smoke non-halogen flame-retardant cross-linked polyolefin Insulation Material utilizes two extrusion apparatus that inside and outside layer is extruded jointly as the outer field material of insulating barrier simultaneously.
2, according to the manufacture method of the described cable insulation of claim 1, it is characterized in that: layer thickness in the described insulating barrier≤0.2 millimeter and less than 50% of insulating barrier gross thickness.
3, according to the manufacture method of the described cable insulation of claim 2, it is characterized in that: inside and outside layer material meets following requirement:
Life-span 〉=60 year;
Co with dosage 25Mrad
60Radiation-resistant property;
Satisfy the NES713 requirement, poison exponent≤2.5;
Under 135 ± 2 ℃ of temperature, 240 hours aging.
4, according to the manufacture method of the described cable insulation of claim 3, it is characterized in that: under 1kV, 20 ℃ of conditions, insulation specific insulation 〉=1 * 10 of inner layer material
16Ω cm, cladding material passes through the requirement of the single insulated wire cores vertical combustion of IEC60332-1, insulation specific insulation 〉=1 * 10
15Ω cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100233735A CN101556848A (en) | 2008-04-10 | 2008-04-10 | Fabricating method of cable insulated layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100233735A CN101556848A (en) | 2008-04-10 | 2008-04-10 | Fabricating method of cable insulated layer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101556848A true CN101556848A (en) | 2009-10-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100233735A Pending CN101556848A (en) | 2008-04-10 | 2008-04-10 | Fabricating method of cable insulated layer |
Country Status (1)
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| CN (1) | CN101556848A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103578660A (en) * | 2013-11-05 | 2014-02-12 | 四川明星电缆股份有限公司 | Method for manufacturing low-voltage power cable used in third-generation nuclear power station containment vessel |
| CN104392787A (en) * | 2014-12-02 | 2015-03-04 | 四川明星电缆股份有限公司 | Building halogen-free low-smoke flame-retardant cable |
-
2008
- 2008-04-10 CN CNA2008100233735A patent/CN101556848A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103578660A (en) * | 2013-11-05 | 2014-02-12 | 四川明星电缆股份有限公司 | Method for manufacturing low-voltage power cable used in third-generation nuclear power station containment vessel |
| CN103578660B (en) * | 2013-11-05 | 2016-10-05 | 四川明星电缆股份有限公司 | The manufacture method of the generation Ⅲ nuclear power station interior lv power cable of containment |
| CN104392787A (en) * | 2014-12-02 | 2015-03-04 | 四川明星电缆股份有限公司 | Building halogen-free low-smoke flame-retardant cable |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| C12 | Rejection of a patent application after its publication | ||
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Application publication date: 20091014 |