CN201204093Y - Copper clad aluminum conductor power cable - Google Patents

Abstract

The utility model relates to a copper-clad aluminum conductor power cable. A copper-clad aluminum conductor power cable, comprising a conductor, conductor shielding, insulation, insulation shielding, copper tape shielding, filling and an outer sheath, is characterized in that the conductor is an inner core aluminum wire covered with a cylindrical copper sheath Copper clad aluminum conductor. The copper-clad aluminum power cable of the utility model has the same conductivity as the copper core wire and cable of the corresponding specification, is light in weight, easy to process, convenient to use, saves more than 80% of copper, effectively reduces the product cost, and avoids the aluminum core cable conductor The surface is easy to oxidize, the contact resistance is large, and the corrosion resistance and mechanical properties are poor, so it has a good promotion and application value.

Description

Copper clad aluminum conductor power cable

technical field

The utility model relates to a copper-clad aluminum conductor power cable.

Background technique

The typical structure of existing medium voltage power cables: copper conductor, inner shield (conductor shield), insulation, outer shield (insulation shield), copper tape shield, interphase filling and outer sheath. Generally, the cable conductor is twisted by multiple wires, and it is easy to form an air gap between it and the insulating layer. The surface of the conductor is not smooth, which will cause the electric field to concentrate. Add a layer of shielding layer of semi-conductive material on the surface of the conductor, which has the same potential as the shielded conductor and is in good contact with the insulating layer, so as to avoid partial discharge between the conductor and the insulating layer. This layer of shielding is the inner shielding layer; Also, there may be gaps at the contact between the insulating surface and the sheath, which is a factor that causes partial discharge. Therefore, a layer of semi-conductive material shielding layer is added on the surface of the insulating layer, which has good contact with the shielded insulating layer and is in contact with the metal sheath. Sheath equipotential, so as to avoid partial discharge between the insulation layer and the sheath, this layer of shielding is the outer shielding layer; for extruded insulated cables without metal sheaths, in addition to the semi-conductive shielding layer, copper tape should be added Or the metal shielding layer wrapped with copper wire. The function of this metal shielding layer is to pass capacitive current during normal operation; when the system is short-circuited, it acts as a channel for short-circuit current and also plays a role in shielding the electric field.

Copper is an irreplaceable important raw material in economic development, and has been widely used in various fields of military industry, electric power, electronics, communications, construction, light industry, machinery manufacturing and transportation. With the development of the economy, copper consumption increases, copper resources decrease, copper is in short supply, and copper prices rise. Cable manufacturing enterprises are large copper consumers, and the shortage and price rise of copper will affect the production of cables and increase the cost of cable production and manufacturing.

Contents of the invention

The purpose of the utility model is to provide a new copper-clad aluminum conductor power cable with good shielding performance and copper saving.

The purpose of this utility model is achieved in this way, a copper-clad aluminum conductor medium voltage power cable, including conductors, conductor shielding, insulation, insulation shielding, copper tape shielding, filling and outer sheath, is characterized in that the conductor is an inner The core is a copper-clad aluminum conductor with a pure aluminum or aluminum alloy wire covered with a cylindrical copper skin.

The better technical solution of the utility model is: the conductor is formed by twisting more than one copper-clad aluminum conductor monofilament, and each copper-clad aluminum conductor is wrapped with conductor shielding, insulation, insulation shielding and copper tape shielding. The insulated cores of the three copper-clad aluminum conductors are filled between the cables, and the outermost layer of the cables is the tape and the outer sheath. In this way, the copper-clad aluminum conductor is used as the conductive core, and the conductor shield, cross-linked polyethylene insulation and insulating shielding material are wrapped around the conductive core through the traditional extrusion process to form the insulated core.

The copper-clad aluminum described in the utility model uses pure aluminum or aluminum alloy as the core, and the copper layer is wrapped on the outer surface of the aluminum core or aluminum alloy core, and the longitudinal distribution is even. Refined copper with a purity of more than %, the metallurgical combination between the copper layer and the aluminum core or aluminum alloy core. Copper-clad aluminum conductors can be formed into copper-clad aluminum wires of various specifications by stretching and pressing after cladding. The copper-aluminum boundary forms a strong metal bond (metallurgical bond), making the wire a whole.

The material of the insulation layer in the utility model is cross-linked polyethylene.

The wrapping layer described in the utility model is a wrapping layer wrapped around a non-woven fabric.

The outer sheath of the utility model is extruded on the outer surface of the tape layer by polyvinyl chloride or halogen-free low-smoke flame-retardant polyolefin.

The filler in the utility model is glass fiber, polypropylene tearing rope or minerals with low thermal resistance, preferably minerals with low thermal resistance. The heat of the conductive core of the low thermal resistance mineral material can be evenly distributed to the surroundings, the thermal resistance coefficient of the filling is low, and the distribution area is large, so that the current carrying capacity of the wire core is improved.

The copper-clad aluminum power cable of the utility model has the same conductivity as the copper core wire and cable of the corresponding specification, is light in weight, easy to process, convenient to use, saves more than 80% of copper, effectively reduces the product cost, and avoids the aluminum core cable conductor The surface is easy to oxidize, the contact resistance is large, and the corrosion resistance and mechanical properties are poor, so it has a good promotion and application value.

Description of drawings

Fig. 1 is a schematic cross-sectional view of a copper-clad aluminum conductor power cable.

Detailed ways

Below in conjunction with specific embodiment, further illustrate the utility model. It should be understood that these embodiments are only used to illustrate the present utility model and are not intended to limit the scope of the present utility model. For the experimental methods without specific conditions indicated in the following examples, the conventional conditions or the conditions suggested by the manufacturer are usually followed. Ratios and percentages are by weight unless otherwise indicated.

Embodiment 1. A copper-clad aluminum conductor power cable

Referring to Figure 1, a conductor 1 made of more than one copper-clad aluminum monofilament twisted, each copper-clad aluminum conductor 1 is wrapped with a conductor shield 2, high-voltage cross-linked polyethylene insulation 3, insulation shield 4, copper tape shield 5 , The outer layer of the insulated wire core composed of three copper-clad aluminum conductors has alternate fillers 6 , and the outer layer of the cable is a tape 7 and a PVC outer sheath 8 . The implementation plan is exactly the same as the production process of ordinary copper core cables, that is, the shielding and insulating materials are respectively extruded around the copper-clad aluminum conductor through an extruder, and then go through processes such as cable forming, tape wrapping, and extrusion of the outer sheath. Rewinding, printing and packaging, it becomes the finished copper-clad aluminum core cable.

The scope of the invention is not to be limited by the specific embodiments described, which are intended only as single examples illustrating various aspects of the invention, and functionally equivalent methods and components are also included within the scope of the invention. In fact, in addition to the content described herein, those skilled in the art can easily grasp various improvements to the utility model with reference to the above description and accompanying drawings. Such modifications also fall within the scope of the appended claims.

Claims (4)

1. A copper-clad aluminum conductor power cable, comprising a conductor, conductor shielding, insulation, insulation shielding, copper tape shielding, interphase filling and an outer sheath, characterized in that the inner core of the conductor is pure aluminum or an aluminum alloy wire sheath A copper-clad aluminum conductor with a cylindrical copper skin. 2. The copper-clad aluminum conductor power cable according to claim 1, characterized in that the copper-clad aluminum core is pure aluminum or aluminum alloy, and the copper layer is wrapped on the outer surface of the aluminum core or aluminum alloy core, and the longitudinal distribution is uniform , the copper layer is concentric with the aluminum or aluminum alloy core. 3. The power cable with copper-clad aluminum conductor according to claim 1, characterized in that the filler is selected from glass fiber, polypropylene tear rope or minerals with low thermal resistance. 4. The power cable with copper-clad aluminum conductor according to claim 1, characterized in that the filling is mineral matter with low thermal resistance.

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