Ceramic silicon rubber insulation medium-voltage fire-resistant cable with rated voltage of 6-35kV and machining process thereof

Abstract

The invention discloses a ceramic silicon rubber insulation medium-voltage fire-resistant cable with rated voltage of 6-35kV and a machining process thereof. A semiconductor taking silicon rubber as a base material or an insulating screen shielding material is adopted, so that a process of simultaneously extruding three layers, namely a semiconductor shielding layer which takes the silicon rubber as the base material, a ceramic silicon rubber insulating layer and a semi-conductive insulating shielding layer which takes the silicon rubber as the base material, is designed; the ceramic silicon rubber serves as an insulating layer and a fire-resistant layer, and the structure of the medium-voltage cable is simplified, the cable is small in outer diameter, light in weight, low in manufacturing cost, long in fire-resistant time, high in fire-resistant temperature and high in non-secondary combustion or flame retardancy, and the defects that in the prior art, the medium-voltage cable is not fire-resistant or low in fire resistance can be well overcome.

Description

technical field [0001] The invention relates to a medium-voltage fire-resistant cable with ceramic silicone rubber insulation, which is suitable for power transmission occasions requiring fire resistance, such as being applied to super high-rise buildings, large-scale high-rise buildings, power transmission, ship engineering, and port machinery. The invention also relates to the ceramic cable Processing technology of silicone rubber insulated medium voltage fire-resistant cables. Background technique [0002] At present, there are mainly three types of fire-resistant cables on the market: 1. Low-voltage fire-resistant cables with overlapping wrapping of mica tape; 2. Mineral insulated fire-resistant cables (referred to as MI cables); 3. Flexible medium-voltage fire-resistant cables. The following is for the above three types Fire-resistant cables do some technically objective evaluations: [0003] 1. Low-voltage fire-resistant cable with overlapping wrapping of mica tape ...

AI Technical Summary

Problems solved by technology

[0011] The disadvantage of the existing medium-voltage fire-resistant cables is that when the external temperature is high or encounters flames, the ceramic silicon rubber cushion layer cannot produce a good heat insulation function after forming a "ceramic sintered layer", and the center line of the cable structure The core insulation layer is made of cross-linked polyethylene or ethylene-propylene rubber, and the normal working temperature is 90°C. If it encounters high temperature, the insulation layer will soften and it is easy to be broken down when it is energized. Therefore, this kind of fire-resistant The cable cannot last for a long time in fire resistance, that is, the fire resistance performance is not good

Moreover, the existing medium-voltage fire-resistant cable has a complex structure, and the manufacturing cost, outer diameter, and weight are relatively large

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