Novel insulated cable

Abstract

The invention provide a novel insulated cable which is high in fire-resistant performance, high in overload protecting capacity, high in working temperature, high in anti-radiation capacity and excellent in shielding performance. The novel insulated cable comprises at least one cable core conductor, fire-resistant layers, insulating layers, oxygen-barrier layers, wrapping layers and filling layers, wherein each cable core conductor is formed by winding at least two aluminum alloy cable cores, each fire-resistant layer is a double-sided flourophlogopite belt, each insulating layer is a ceramic fire-resistant composite belt, each oxygen-barrier layer is a ceramic fire-resistant composite belt, each wrapping layer is a vitreous fiber belt, each filling layer is made of vitreous fibers, at least one fire-resistant layer and at least one insulating layer are sequentially wound outside each cable core conductor, the cable core conductors form an overall cable core, at least one oxygen-barrier layer and at least one wrapping layer are sequentially wound outside the overall cable core, and the space between the cable core conductors and the space between the overall cable core and the oxygen-barrier layers are filled with the filling layers.

Description

technical field [0001] The invention relates to an improvement of a cable, in particular to a new type of high flame-retardant insulation fire-resistant cable. Background technique [0002] In the 1960s and 1970s, the global copper price rose rapidly. Due to political factors, copper as a strategic material was subject to trade controls. A large number of domestic aluminum was used as the main conductor material for power transmission cables. "Substituting aluminum for copper" has become a common technical policy in the electrical industry. . Therefore, the trunk lines and branch lines of civil buildings are all made of pure aluminum cables. The shortcomings of pure aluminum conductors are mainly reflected in the following aspects: 1. Poor mechanical strength, easy to break, and easy to creep; 2. Need to fasten screws frequently; 3. Easy to overload and heat, there are potential safety hazards; 4. Solve the problem of copper-aluminum transition connection. These problems ...

AI Technical Summary

Problems solved by technology

[0003] In addition, the traditional mineral insulated cable also has the following disadvantages: 1. First, its sheath uses a copper sheath, which increases the production cost due to the large increase in the amount of copper used.

2. Cables with larger cross-sections are still relatively hard and not flexible enough, so larger cross-sections (greater than 400mm 2 ) cannot be produced yet, and cannot meet the requirements of high current in the system

Due to its structural characteristics, there is a considerable gap between the sheath and the insulating layer, which provides a space for the mica powder that falls off, so that it is very easy to cause an electrical short circuit under the impact of an external force.

However, the insulation layer of this kind of cable does not have the ceramic fire-proof and fire-resistant composite tape insulation layer like the high flame-retardant and fire-resistant mineral insulated cable, so its explosion-proof performance is not good, and combustible gas, gasoline, steam, etc. will pass through the cable sheath and the cable. The gap in the insulation layer spreads to the electrical equipment connected by cables or other areas with explosion-proof requirements, so in some important places, such as fire protection systems, etc., it should be carefully selected

In addition, if an overvoltage is accidentally generated during the use of traditional cables, due to improper selection of the sheath, once the traditional mineral insulated cable is broken down, its electrical performance can no longer be restored, and it can only be scrapped.

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