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Manufacture method for low-voltage electric power cable used for nuclear power station

A low-voltage electric power and cable manufacturing technology, which is applied in the direction of cable/conductor manufacturing, conductor/cable insulation, circuit, etc., can solve the problem that cables cannot meet high insulation and high flame retardancy at the same time, and achieve high friction and shear High shear force and high insulation effect

Active Publication Date: 2013-04-17
SICHUAN MINGXING CABLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for manufacturing power cables for radiation-resistant low-voltage nuclear power plants aimed at the defect that the cables manufactured in the prior art cannot simultaneously satisfy high insulation and high flame retardancy. The cables manufactured by this method have high insulation properties And high flame retardancy, meeting the requirements of nuclear power plant cables

Method used

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  • Manufacture method for low-voltage electric power cable used for nuclear power station

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Effect test

Embodiment 1

[0026] Manufacturing method of low-voltage power cables for nuclear power plants, including material selection—drawing—annealing—conductor stranding—isolation layer wrapping—insulation layer extrusion—insulation layer irradiation cross-linking treatment—cable filling—isolation layer extrusion—armoring— Outer sheath extrusion - outer sheath irradiation crosslinking treatment - finished product step;

[0027] Insulation layer extrusion: The insulation layer is extruded by double-layer co-extrusion, the inner layer is made of polyethylene screw, extruded with irradiated cross-linked polyethylene, the processing temperature is 125°C; the outer layer is made of semi-extruded mold, with a compression ratio of 1.25:1 The equal-depth and equal-distance screw is insulated from the inner layer and extruded low-smoke, halogen-free thermosetting polymer to form the insulating layer. The processing temperature is controlled at 110°C, cooled in sections, and the cooling water temperature is ...

Embodiment 2

[0041] Manufacturing method of low-voltage power cables for nuclear power plants, including material selection—drawing—annealing—conductor stranding—isolation layer wrapping—insulation layer extrusion—insulation layer irradiation cross-linking treatment—cable filling—isolation layer extrusion—armoring— Outer sheath extrusion - outer sheath irradiation crosslinking treatment - finished product step;

[0042] Insulation layer extrusion: The insulation layer is extruded by double-layer co-extrusion, the inner layer is made of polyethylene screw, extruded with irradiated cross-linked polyethylene, the processing temperature is 145°C; the outer layer is made of semi-extrusion mold, with a compression ratio of 1.5:1 The equal-depth and equal-distance screw is insulated with the inner layer and extruded with low-smoke and halogen-free thermosetting polymer to form the insulating layer. The processing temperature is controlled at 130°C, and the cooling water temperature is 30°C;

[00...

Embodiment 3

[0056] Manufacturing method of low-voltage power cables for nuclear power plants, including material selection—drawing—annealing—conductor stranding—isolation layer wrapping—insulation layer extrusion—insulation layer irradiation cross-linking treatment—cable filling—isolation layer extrusion—armoring— Outer sheath extrusion - outer sheath irradiation crosslinking treatment - finished product step;

[0057] Insulation layer extrusion: The insulation layer is extruded by double-layer co-extrusion, the inner layer is made of polyethylene screw, extruded with irradiated cross-linked polyethylene, and the processing temperature is 165°C; the outer layer is made of semi-extruded mold with a compression ratio of 1.8:1 The equal-depth and equal-distance screw is insulated with the inner layer and extruded with low-smoke and halogen-free thermosetting polymer to form the insulating layer. The processing temperature is controlled at 150°C, and the cooling water temperature is 35°C;

[...

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Abstract

The invention discloses a manufacture method for a low-voltage electric power cable used for a nuclear power station, which comprises the following steps: sorting; drawing wires; annealing; twisting a conductor; lapping an isolation layer; extruding the isolation layer; carrying out irradiation crosslinking processing to the isolation layer; cabling and filling; sheathing the isolation layer; armoring; extruding an outer sheath; carrying out irradiation crosslinking processing to the outer sheath; and obtaining a finished product. The manufacture method is characterized in that the step of extruding the isolation layer adopts double-layer coextrusion, wherein an inner layer adopts a polyethylene (PE) screw, and an outer layer adopts a semi-extruded die; the step of extruding the outer sheath adopts the semi-extruded die; the screw with the compression ratio of 1.25:1-2.0:1 sheathes low-smoke halogen-free thermosetting polymer on the isolation layer subjected to irradiation crosslinking processing to form the outer sheath; and machining temperature is controlled to 105-175 DEG C. The cable manufactured with the manufacture method disclosed by the invention has the advantages of high insulativity and high fire resistance, and the use requirement of a nuclear power station cable can be satisfied.

Description

technical field [0001] The invention relates to the technical field of cables, in particular to a cable, in particular to a method for manufacturing a radiation-resistant low-voltage power cable used in nuclear power plants. Background technique [0002] As nuclear power plants have higher and higher requirements for cable safety, the operating environment of nuclear power plants requires cables for nuclear power plants to have high electrical properties, high flame retardancy and radiation resistance. At present, the insulation layer of conventional cables is a single structure. When it needs to have high electrical properties, other properties of the insulation, especially the flame retardant performance, are not assessed; when it needs to have flame retardant requirements, the electrical properties of the insulation are not assessed There are particularly high assessment requirements. Ordinary power cables are used in radiation environments, and the insulation and sheath...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B13/00H01B13/14H01B13/02
CPCB29C2947/92704B29C2947/92714C08J3/28B29C47/92B29C47/065B29C47/025B29C48/21B29C48/154B29C48/92B29C2948/92704B29C2948/92714
Inventor 栾渊明李广元沈卢东盛业武陈光高沈智飞王冰迪
Owner SICHUAN MINGXING CABLE