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A method for manufacturing fire-resistant medium and high voltage cables

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

Active Publication Date: 2015-08-12
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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  • A method for manufacturing fire-resistant medium and high voltage cables
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  • A method for manufacturing fire-resistant medium and high voltage cables

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A method for manufacturing fire-resistant medium and high voltage cables, comprising 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 twisting and cable wrapping layer wrapping→extrusion of oxygen barrier layer→wrapping of fire-resistant isolation layer extrusion→second tape layer wrapping→metal armor layer wrapping→third tape Layer wrapping → outer sheath layer extrusion, the step of extruding the oxygen barrier layer refers to using an extrusion mold on the extrusion equipment, and using a screw with a compression ratio of 1.25:1 to extrude a high flame-retardant layer with an oxygen index of 32 The polyolefin material is extruded on the cabled tape layer, the extruded thickness is 2.0mm, and the processing temperature is 80°C; the extruding step of the all-inclusive ref...

Embodiment 2

[0043] A method for manufacturing fire-resistant medium and high voltage cables, comprising 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 twisting and cable wrapping layer wrapping→extrusion of oxygen barrier layer→wrapping of fire-resistant isolation layer extrusion→second tape layer wrapping→metal armor layer wrapping→third tape Layer wrapping → outer sheath layer extrusion → performance inspection experiment → finished product packaging and storage, the oxygen barrier layer extrusion step refers to the use of extrusion molds on the extrusion equipment, with a screw with a compression ratio of 1.25:1 The high flame-retardant polyolefin material with an oxygen index of 35 is extruded on the cable wrapping layer, the extruded thickness is 4.0mm, and the processing temperature ...

Embodiment 3

[0054] A method for manufacturing fire-resistant medium and high voltage cables, comprising 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 twisting and cable wrapping layer wrapping→extrusion of oxygen barrier layer→wrapping of fire-resistant isolation layer extrusion→second tape layer wrapping→metal armor layer wrapping→third tape Layer wrapping → outer sheath layer extrusion → performance inspection experiment → finished product packaging and storage, the oxygen barrier layer extrusion step refers to the use of extrusion molds on extrusion equipment with a compression ratio of 2.0:1 The screw extrudes the highly flame-retardant polyolefin material with an oxygen index of 40 on the cable wrapping layer, the extruded thickness is 5.0mm, and the processing temperature is 165°C; ...

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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 fire-resistant medium and high voltage cables. Background technique [0002] Entering the 21st century, my country's infrastructure has entered a golden age of construction. Today, with the rapid expansion of population and urbanization, in order to save resources, urban construction has to develop towards clustering, scale and high-level development. In key national and civil projects such as stations, airports, subways, nuclear power plants, business hotels, hospitals, shopping malls, residential buildings, etc., in addition to considering their necessary functions and environmental comfort, safety is increasingly on the agenda , Shanghai "11.15" catastrophic fire accident has brought people a very profound warning. As a special cable, fire-resistant cables are used in occasions that require a high safety factor, and have been widely reco...

Claims

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Application Information

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Patent Type & Authority Patents(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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