Non-sheathed high-temperature resistant fireproof low-voltage cable

Abstract

The invention discloses a non-sheathed high-temperature resistant fireproof low-voltage cable, which comprises a wreath-shaped wire core, wherein the wreath-shaped wire core is overlapped and wrappedwith a low-smoke halogen-free high-flame-retardant tightening belt, a copper belt shielding layer is extruded on the low-smoke halogen-free high-flame-retardant tightening belt, a fireproof layer formed by overlapping three layers of fireproof cloth is extruded on the copper belt shielding layer, and the fireproof layer is sleeved with a high-temperature resistant plastic-coated corrugated pipe; the wreath-shaped wire core is composed of four round insulating wire cores and a wreath-shaped high-temperature resistant ceramic pipe co-extruded on the four round insulating wire cores; and a radiating hole is formed in the center of the high-temperature resistant ceramic pipe. The non-sheathed high-temperature resistant fireproof low-voltage cable has the advantages of high tenacity, high impact resistance, good bending performance, high temperature resistance, fire prevention, interference resistance and the like.

Description

technical field [0001] The invention belongs to the field of electric wires and cables, and specifically refers to a high-temperature, fire-resistant and low-voltage cable without a sheath. Background technique [0002] With the development of China's economy and urbanization, the urban power grid system has become particularly crowded. A large number of cables are criss-crossed in the urban power grid. Due to the limited space for cable laying, a large number of cables are laid together, which poses higher requirements for the safety of the power grid. Requirements, especially the protection of power grid fires are getting more and more attention. There are two fire protection measures for ordinary cables. One is to use fireproof cable trays, fireproof bags or fireproof grooves, but this measure makes the heat dissipation performance of the cable worse, the thermal resistance coefficient is increased, and the carrying capacity is reduced; the other is to use fire-resistant ...

AI Technical Summary

Problems solved by technology

There are two fire protection measures for ordinary cables. One is to use fireproof cable trays, fireproof bags or fireproof grooves, but this measure makes the heat dissipation performance of the cable worse, the thermal resistance coefficient is increased, and the carrying capacity is reduced; the other is to use fire-resistant cables. The cable is wrapped with mica tape outside the conductor as a refractory layer, but this measure can only ensure short-term power supply when the cable is burning. The cable still needs to be scrapped and replaced with a new cable after burning, and it cannot be repaired when the cable insulation and conductor are intact. Continue to use later, so the secondary input cost is increased

Conductors usually have a small cross-section and poor self-supporting performance, especially when the cable is used under the working condition of not being buried in the ground. Due to the poor bearing performance, the weight of the cable itself will cause the cable conductor to break, and at the same time, it is easy to damage the small cable during construction. conductor

The anti-interference is poor. When the current conveyed by the cable itself contains high-order harmonic components, the cable will generate electromagnetic interference to the electronic equipment around it; Electromagnetic interference caused by various electrical connections

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