Production method for conductors for fire-resistant middle-high voltage cables

Abstract

The invention discloses a production method for conductors for fire-resistant middle-high voltage cables. The method includes steps of material selection, wire drawing, annealing, conductor hinging, co-extrusion and coating of an inner shielding layer, an insulation layer and an outer shielding layer, setting of a metal shielding layer, extrusion of a phase-separation fire-resistant insulation layer, winding of a first wrapping tape layer, cabling twisting and winding of cabling belting layer, winding of a metal armored layer, winding of a second wrapping tape layer and an outer sheath layer extrusion, wherein during the extrusion of the phase-separation fire-resistant insulation layer, ceramic silicon rubber materials are extruded on the metal shielding layer through a silicon rubber extruder, and the extruding thickness is 2.0mm-4.0mm. According to the method, the phase-separation fire-resistant insulation layer is arranged, the silicon rubber extruder is used for extrusion of the ceramic silicon rubber materials, therefore the materials are provided with good thermal insulating effect, ceramic bodies are fired by flames at a high temperature and provided with a certain mechanical strength and good electrical insulation performance due to the fact that the major material is inorganic silicon, so that the fire-resistant performance of the cables can be improved.

Description

technical field [0001] The invention relates to the technical field of cable manufacturing, in particular to a conductor manufacturing method for 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 w...

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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

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