CN203673871U - Novel overhead electric cable - Google Patents

Abstract

A novel overhead electric cable is disclosed and comprises three groups of cable cores, a bearing core and a winding and wrapping layer, wherein the three groups of cable cores are uniformly arranged to form a triangle, the centers of the cable cores are conductors, insulation layers are extruded outside the conductors, the bearing core is arranged at the top end of a group of cable core in a parallel manner, the conductors are copper conductors, the insulation layers are made of crosslinking polyethylene materials, and the bearing core is made of an aluminium alloy material. The novel overhead electric cable is characterized in that a structure having the three groups of copper conductor cable cores and the aluminium alloy bearing core is adopted, an electric resistor coefficient is effectively lowered, current-carrying capacity is improved and tensile strength is enhanced. The novel overhead electric cable is small in maintenance cost and long in service life.

Description

A kind of overhead cable

Technical field

The utility model relates to power cable field, is specifically related to a kind of aerial cable.

Background technology

Transmission line is generally divided into two kinds, cable and overhead transmission line, both differences are the cable ground or underground that is generally laid in, aerial cable is to utilize electric pole, cross-arm etc. to be erected in the air, in power supply system, high-voltage line and greenbelt all will occupy certain space, and the space passage dwindles day by day, tree line is particularly thorny, and electric shock casualty accident happens occasionally.The power supply of employing underground cable, the available underground space is also very limited, and excavation difficulty, wastes time and energy, and aerial cable has just arisen at the historic moment in the time of high-voltage line and underground cable application difficult.

Traditional aerial cable generally all adopts aluminium core or aluminium alloy core as conductor, mainly consider low price, laid down cost is low, but the continuous maximum operation (service) temperature of the permission of aluminium conductor can not exceed 70 ℃, aerial cable GB GB14049-93[1] in regulation, only have the copper conductor of cross linked insulation of employing, and cable with load bearing core its allow maximum operation (service) temperature can reach 90 ℃, and the common not aluminium core crosslinked cable with supporting, its permission maximum operation (service) temperature should be only 70 ℃.For this reason, be subject to the restriction of serviceability temperature, aluminium core aerial cable under hightension effect, ampacity also will decline, and under same ampacity condition, adopts after aluminium conductor, because conductor diameter strengthens, the insulating barrier of outside also will increase, and what economic advantages aluminium core aerial cable has not just possessed yet like this, and easily oxidation and the corrosion of aluminium conductor surface, fail safe and the conductor tensile strength that can greatly reduce attached joint, the useful life of cable is not long yet.

Utility model content

The utility model object is the aerial cable that a kind of good conductivity, the high long service life of tension stress intensity will be provided.

For achieving the above object, the utility model adopts following technical approach: it comprises three groups of cable cores, load bearing core and lapping layers, and three groups of cable cores are triangular in shape evenly distributed, and cable core center is conductor, conductor is extruded with insulating barrier outward, one group of parallel load bearing core that is provided with in cable core top.

Further described conductor is copper conductor.

Further described insulating barrier adopts cross-linking polyethylene materials.

Further described load bearing core adopts aluminum alloy materials.

Beneficial effect: the utility model adopts the structure of three groups of copper conductor cable core+aluminium alloy load bearing core, effectively reduces resistance coefficient, has improved ampacity and has strengthened tension stress intensity, the few long service life of maintenance cost.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model;

In figure: 1-conductor, 2-insulating barrier, 3-load bearing core, 4-lapping layer

Embodiment

Its structure as shown in Figure 1: a kind of overhead cable, it comprises that three groups of cable cores, load bearing core 3 and 4, three groups of cable cores of lapping layer are triangular in shape evenly distributed, cable core center is conductor 1, the outer parallel load bearing core 3 that is provided with in 2, one groups of cable core tops of insulating barrier that is extruded with of conductor 1; Described conductor 1 is copper conductor; Described insulating barrier 2 adopts cross-linking polyethylene materials; Described load bearing core 3 adopts aluminum alloy materials.

The utility model is changed into insulation main push-towing rope core fan-shaped by circle, effectively reduced the space between cable core, has saved inserts, has reduced the production cost of cable.

Claims (1)

1. an overhead cable, it comprises three groups of cable cores, load bearing core (3) and lapping layer (4), it is characterized in that: three groups of cable cores are triangular in shape evenly distributed, cable core center is conductor (1), conductor (1) is outer is extruded with insulating barrier (2), one group of parallel load bearing core (3) that is provided with in cable core top, and described conductor (1) is copper conductor, described insulating barrier (2) adopts cross-linking polyethylene materials, and described load bearing core (3) adopts aluminum alloy materials.

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