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Fabricating method of cable insulated layer

A cable insulation and manufacturing method technology, applied in the direction of conductor/cable insulation, insulated conductors, insulated cables, etc., can solve the problem that flame retardancy, electrical performance and radiation resistance cannot be satisfied at the same time, radiation intolerance, accident occurrence rate advanced questions

Inactive Publication Date: 2009-10-14
CHANGZHOU BAYI CABLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The flame retardant performance, electrical performance and radiation resistance performance of cables produced by conventional single insulation layer manufacturing technology cannot meet the above requirements at the same time. When applied to nuclear facilities, it is easy to cause short circuit and high accident rate.
And it is not resistant to radiation, and its lifespan is less than 40 years

Method used

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  • Fabricating method of cable insulated layer

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0027] Embodiment 1: Select low-smoke, halogen-free, cross-linked polyethylene insulating material as the material for the inner layer 2 of the insulating layer, low-smoke, halogen-free, flame-retardant cross-linked polyolefin insulating material as the material for the outer layer 3 of the insulating layer, and the materials for the inner and outer layers The performance meets the following requirements:

[0028] Life expectancy ≥ 60 years;

[0029] Co with a dose of 25 Mrad 60 Radiation resistance;

[0030] Meet NES713 requirements, toxicity index ≤ 2.5;

[0031] Aging at 135±2℃ for 240 hours.

[0032] In addition, the insulation volume resistivity of the inner layer material is ≥1×10 under the conditions of 1kV and 20°C 16 Ω·cm, the material of the outer layer has passed the vertical burning requirement of a single insulated core of IEC 60332-1.

[0033] Extrude the inner and outer layer materials that meet the above requirements simultaneously with two extruders, and ...

Embodiment approach 2

[0034] Embodiment 2: Choose low-smoke, halogen-free, cross-linked polyethylene insulating material as the material for the inner layer 2 of the insulating layer, low-smoke, halogen-free, flame-retardant cross-linked polyolefin insulating material as the material for the outer layer 3 of the insulating layer, and the materials for the inner and outer layers The performance meets the following requirements:

[0035] Life expectancy ≥ 60 years;

[0036] Co with a dose of 25 Mrad 60 Radiation resistance;

[0037] Meet NES713 requirements, toxicity index ≤ 2.5;

[0038] Aging at 135±2℃ for 240 hours.

[0039] In addition, the insulation volume resistivity of the inner layer material is ≥1×10 under the conditions of 1kV and 20°C 16 Ω·cm, the material of the outer layer has passed the vertical burning requirement of a single insulated core of IEC 60332-1.

[0040] Extrude the inner and outer layer materials that meet the above requirements simultaneously with two extruders, and ...

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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: [0001] The invention relates to the field of cable manufacturing, in particular to a method for manufacturing a cable insulating layer. Background technique: [0002] Civilian nuclear facility projects (including nuclear power plants, nuclear test reactors, etc.) put forward high performance requirements for cable insulation, as follows: [0003] 1. When the rated or maximum operating temperature of the cable is 90°C, the normal service life of the cable is more than 60 years. [0004] 2. The insulating layer has high flame retardant performance, passing the vertical burning requirement of a single insulated core of IEC 60332-1. Requirements after burning: the unburned distance is greater than 50mm, and the drippings do not ignite the cotton. [0005] 3. The insulating layer has high mechanical properties. The minimum tensile strength before aging is 9.0MPa, and the minimum elongation at break before aging is 200%. After aging in an oven at 135±3°C and 240...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/14H01B7/02H01B7/17H01B7/295H01B3/44
Inventor 周叙元朱峰洪启付
Owner CHANGZHOU BAYI CABLE
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