Production method of fireproof middle and high voltage cables

A technology for medium and high voltage cables and manufacturing methods, which are applied in the manufacture of cables/conductors, power cables with shielding layers/conducting layers, circuits, etc., can solve the problems of not being able to save time for rescue work, too simple structure, and poor heat insulation effect. , to achieve the effect of improving electrical insulation performance, enhanced mechanical strength, and good bending performance

Active Publication Date: 2013-02-20
SICHUAN MINGXING CABLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this patent are: the structure of the cable itself is too simple, the heat insulation effect is poor, the fire-resistant time is short, and the fire-resistant performance is also poor. Under the damage of the power system by sudden accidents such as fires and natural disasters, it cannot be used for power supply. Rescue efforts buy time

Method used

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  • Production method of fireproof middle and high voltage cables
  • Production method of fireproof middle and high voltage cables
  • Production method of fireproof middle and high voltage cables

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A method for manufacturing a fire-resistant medium and high voltage cable, including the following steps: material selection → wire drawing → annealing → conductor stranding → co-extrusion and coating of inner shielding layer, insulating layer and outer shielding layer → metal shielding layer setting → first tape Layer wrapping → cable stranding and cable wrapping → oxygen barrier squeezing → turnkey refractory insulation layer squeezing → second wrapping layer wrapping → metal armor layer wrapping → third wrapping tape Layer wrapping → outer sheath layer extruding. The oxygen barrier layer extruding step refers to the use of an extrusion die on the extrusion equipment and a screw with a compression ratio of 1.25:1 to reduce the oxygen index to a high resistance of 32 The flammable polyolefin material is extruded on the cable-forming tape layer with a thickness of 2.0mm and a processing temperature of 80°C; the extruding step of the turnkey refractory isolation layer refe...

Embodiment 2

[0043] A method for manufacturing a fire-resistant medium and high voltage cable, including the following steps: material selection → wire drawing → annealing → conductor stranding → co-extrusion and coating of inner shielding layer, insulating layer and outer shielding layer → metal shielding layer setting → first tape Layer wrapping → cable stranding and cable wrapping → oxygen barrier squeezing → turnkey refractory insulation layer squeezing → second wrapping layer wrapping → metal armor layer wrapping → third wrapping tape Layer wrapping → outer sheath layer extruding → performance inspection experiment → finished product packaging and storage. The oxygen barrier layer step extruding step refers to the use of an extrusion die on the extrusion equipment with a compression ratio of 1.25:1 The screw extrudes a high flame-retardant polyolefin material with an oxygen index of 35 on the cable wrap layer with a thickness of 4.0 mm and a processing temperature of 120°C; the extrudin...

Embodiment 3

[0054] A method for manufacturing a fire-resistant medium and high voltage cable, including the following steps: material selection → wire drawing → annealing → conductor stranding → co-extrusion and coating of inner shielding layer, insulating layer and outer shielding layer → metal shielding layer setting → first tape Layer wrapping → cable stranding and cable wrapping → oxygen barrier squeezing → turnkey refractory insulation layer squeezing → second wrapping layer wrapping → metal armor layer wrapping → third wrapping tape Layer wrapping → outer sheath layer extruding → performance inspection experiment → finished product packaging and storage. The oxygen barrier layer step extruding step refers to the use of extrusion molds on the extrusion equipment with a compression ratio of 2.0:1 The screw extrudes a high flame-retardant polyolefin material with an oxygen index of 40 on the cable wrap layer with a thickness of 5.0mm and a processing temperature of 165°C; the extruding s...

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Abstract

The invention discloses a production method of fireproof middle and high voltage cables. The production method includes the following steps: sorting; wire drawing; annealing; conductor stranding; inner shielding layer, insulation layer and outer shielding layer co-extrusion and warping; metal shielding layer arranging; first wrapping tape layer lapping; cabling stranding and cabling wrapping tape layer lapping; oxygen isolation layer extrusion; package fireproof isolation layer extrusion; second wrapping tape layer lapping; metal armor layer lapping; third wrapping tape layer lapping and outer sheath layer extrusion. The middle and high voltage cables produced in the production method have good heat insulation effect when being paved on buildings, are improved in fireproof performance, can delay damage to a power system caused by fire disasters, natural disasters and other accidents, and gains time for rescue.

Description

Technical field [0001] The invention relates to the technical field of cable manufacturing, in particular to a method for manufacturing a fire-resistant medium and high voltage cable. Background technique [0002] In the 21st century, my country's infrastructure has entered a golden period of construction. Today, with the rapid expansion of population and urbanization, in order to save resources, urban construction has to develop towards clustering, large-scale and high-level development. In addition to important national and livelihood projects such as stations, airports, subways, nuclear power plants, business hotels, hospitals, shopping malls, residential buildings, etc., in addition to their necessary functions and environmental comfort, safety is increasingly on the agenda , Shanghai’s "11.15" fire accident gave people a very deep warning. As a special type of cable, fire-resistant cables are used in occasions that require high safety factors and are widely recognized by c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/24H01B13/26H01B13/00H01B9/02
Inventor 宋强李广元沈卢东盛业武陈光高兰超王冰迪
Owner SICHUAN MINGXING CABLE
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