Manufacturing method of 35 KW environmental protection type A kind fire proof power cable for underground railway circuit

Abstract

The invention relates to a method of making a 35Kv environmental-protection Class-A fireproof power cable for subway main lines, selecting a tightly-compressed and intertwisted circular conductor, coating the external surface of the conductor with a semiconductor material and a cross-linked polytene material in turn, adopting an oxide cross-linking or electronic irradiation technique to graft flame-retardant molecules and carbon-forming units onto the cross-linked polytene material, then coating with a copper band, then winding many layers of high flame-retardant gelatinized glass cloth bands on the copper band, using a copper band for butt welding in the axial direction of an insulated line core on the glass cloth winding layer and rolling into a ripple metallic tube, making a thermal-protecting coating on the ripple metallic tube and finally extruding a low-smoke, halogen-free, flame-retardant and environmental-protection polyolefin material outer jacket on the heat insulating layer. Its flame retardancy can meet the requirement of 1A-level flame-retardant test, and they have low burning losses, high photo-permeability and small toxicity. It has the properties of moisture proofing and preventing bio-disoperation like termite resistance, mouse preventing property, etc.

Description

technical field [0001] The invention relates to a production and manufacturing method of cables, belonging to the technical field of cables. Background technique [0002] With the rapid development of the national economy, big cities are becoming more and more prosperous, the size and population of the cities are growing rapidly, and the traffic contradictions are becoming more and more serious. The development of large-capacity subways and light rail transportation has become the first choice to solve the traffic contradictions in big cities. Rail transit has become a trend in urban traffic construction, and the length of rail traffic has become a symbol of the civilization of a modern city. In the "Tenth Five-Year Plan", the country proposed for the first time the development of urban rail transit, and the "National Industrial Technology Policy" also clearly stated: "In cities with more than one million people, priority should be given to the development of rail transit-ba...

AI Technical Summary

Problems solved by technology

Once the XLPE insulation material is ignited, the material will generate a large amount of heat, which will further intensify the combustion, and the ambient temperature will rise rapidly, eventually leading to the complete burning of the cable

In an electrical fire accident, it will bring significant losses to accident rescue work and people's lives and property

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