Pair-twist polyvinyl chloride insulated double-layer steel-tape armored polyvinyl chloride sheath power cable

Abstract

The invention discloses a pair-twist polyvinyl chloride insulated double-layer steel-tape armored polyvinyl chloride sheath power cable, and the power cable comprises a cable core. The cable core is formed by the twisting of a pair of insulating wire cores. The insulating wire cores respectively consists of a conductor, a polyvinyl chloride insulating layer wrapping the conductor in an extruding manner, and a multilayer tightening belt wrapping a cross-linked polyethylene insulating layer. An inorganic hydration filling layer is disposed in the gaps of the cable core, and the exterior of the cable core is provided with a heat tape. The exterior of the heat tape is provided with a first steel tape armored layer, and the exterior of the first steel tape armored layer is wrapped by a rubber and plastic inner sheath. The exterior of the rubber and plastic inner sheath is provided with a steel wire shielding layer, and the exterior of the steel wire shielding layer is provided with a mica flame-retardant tape. The exterior of the mica flame-retardant tape is provided with a second steel tape armored layer. Finally, the outermost layer of the cable is provided with a polyvinyl chloride external sheath in an extruding manner. The power cable is high in insulation reliability, is good in flame-retardant effect, is good in water-resistance effect, is resistant to cold, can prevent the damages to the animal and plant, and can improve the wear resistance.

Description

technical field [0001] The invention relates to the field of cables, in particular to a twisted polyvinyl chloride insulated double-layer steel tape armored polyvinyl chloride sheathed power cable. Background technique [0002] The current-carrying capacity of the cable is usually related to the cross-sectional area of ​​the conductor core. When the current increases, the temperature of the conductor will increase. When the temperature of the insulating layer covered by the conductor exceeds the upper limit, the performance of the insulating layer will change, thereby The insulation reliability of the insulating layer is greatly reduced, which affects the service life of the cable. [0003] The existing ordinary cables have problems of poor structural stability and flammability, so the safety level of electrical circuits and the flame retardancy of cables have attracted more and more attention. [0004] At the same time, even if the cable has good temperature resistance, it...

AI Technical Summary

Problems solved by technology

At present, most cables are only suitable for a normal temperature environment with a relatively narrow temperature range. In the alpine region, these cables will have serious safety problems such as hardening, cracking, and embrittlement, and will no longer be suitable for the alpine environment. power supply will be a big problem

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