Internally-tangent parallel bunched cable

Abstract

In order to solve the problem that almost half of area of the surface of a parallel bunched overhead insulating cable is in the closed state during operating, so the dissipation of heat is influenced greatly, the invention discloses an internally-tangent parallel bunched cable. Each of four cables comprises a metal conductor, an insulating layer and an internally-tangent rib, wherein the insulating layer is covered outside the metal conductor to form cables; the internally-tangent ribs are in tangential connection with the cables, and each of the internally-tangent ribs consists of an intermediate section and two side sections; and the length L1 of the intermediate section is greater than the diameter D of each cable. The internally-tangent parallel bunched cable has the advantages that due to the increase of radiating areas, the radiating condition is improved greatly, so that the long-term permitted current-carrying capacity of each cable in the combined cables is improved by 10 to 15 percent to reach over 85 percent. In addition, the thickness of the intermediate section is smaller than that of each side section, so the square regression of the cables is easy to realize; and due to the increase of the length of each side section, each side section is easy to cut during tap joint, and the insulating layer is difficult to damage.

Description

technical field [0001] The invention relates to a cable, in particular to a parallel bundled cable. Background technique [0002] At present, more than 80 countries in the world have used stranded bundled cables, and my country's urban and rural distribution networks have also used a large number of parallel bundled overhead insulated cables with independent intellectual property rights in my country. The difference between bundled cables and parallel bundled overhead insulated cables is: the former is stranded One is parallel; the twisted bundled cable has many production processes, expensive equipment, long process, high cost, and in the running state, because the cable is twisted, the heat release space is small, and the long-term allowable carrying capacity is the highest value of a single cable 70% of that; parallel bundled overhead insulated cables adopt a one-time molding process, with simple equipment, simplified procedures, low cost, and high efficiency. 70% of the va...

AI Technical Summary

Problems solved by technology

[0002] At present, more than 80 countries in the world have used stranded bundled cables, and my country's urban and rural distribution networks have also used a large number of parallel bundled overhead insulated cables with independent intellectual property rights in my country. The difference between bundled cables and parallel bundled overhead insulated cables is: the former is stranded One is parallel; the twisted bundled cable has many production processes, expensive equipment, long process, high cost, and in the running state, because the cable is twisted, the heat release space is small, and the long-term allowable carrying capacity is the highest value of a single cable 70% of that; parallel bundled overhead insulated cables adopt a one-time molding process, with simple equipment, simplified procedures, low cost, and high efficiency. 70% of the value; the cross-section of the existing parallel bundled overhead insulated cables is as follows Figure 4 As shown, since the four cables form a semi-enclosed shape, almost half of the surface area of ​​the cable is closed, and the heat dissipation is greatly affected.

Images