CN203300309U - Power cable used for electric power transmission and distribution system - Google Patents

Abstract

The utility model discloses a power cable for power transmission and distribution system, which includes a cable core, and is characterized in that: the center of the cable core is a circular conductive composite conductor composed of five divided conductors, and the conductors are arranged from inward to The outer cover is successively covered with a conductor shielding layer, an insulating layer, an insulating shielding layer, a semi-conductive resistance water buffer layer, a corrugated aluminum sheath and an outer sheath, and a tinned copper wire is provided between the corrugated aluminum sheath and the outer sheath. Zinc-steel wire composite strands are wound around the reinforcement layer. The shielding layer of the utility model is composed of phase-separated shielding and total shielding, in which the reinforcement layer doubles as the overall shielding layer to protect the neutral wire core. It not only has high conductivity, comprehensive radial water resistance/water resistance, and weather resistance It is more resistant to impact and reduces electromagnetic induction, making it safer and more reliable.

Description

Power cable for power transmission and distribution system

technical field

The utility model belongs to the technical field of cables, in particular to a power cable for a power transmission and distribution system.

Background technique

In recent years, with the development of the national economy, the power consumption has increased sharply, and the demand for large-section and large-capacity transmission cables has increased year by year. The quality of cross-linked cables of ^630mm2 and below in China is still stable, but the production of conductive cores of cross-linked cables of ^800mm2 and above is difficult due to equipment, process equipment, process technology and other reasons, and the quality is unstable. For large cross-section conductors of ^800mm2 and above, the transmission capacity does not increase linearly with the increase of the conductor cross-section. The reason for this phenomenon is the influence of "skin effect" and "proximity effect". In order to minimize the loss of the conductor, Chinese patent CN201210405261.2 discloses a large cross-section split conductor comprehensive water-blocking cross-linked power cable, the center of which is a conductor unit, and the conductor unit is covered with a conductor shielding layer from the inside to the outside. , insulating layer, insulating shielding layer, semi-conductive resistance water buffer tape layer, corrugated aluminum sheath and outer sheath. The patented technology is characterized by high electrical conductivity, integrated radial water resistance/water resistance, and weather resistance. But there is also an obvious deficiency, that is, the impact resistance is not good, and the anti-electromagnetic induction effect is not ideal.

Utility model content

The purpose of this utility model is to provide a power cable for power transmission and distribution system with a new structure, which not only has high conductivity, comprehensive radial water resistance/water resistance, weather resistance, but also can withstand impact and reduce electricity. Magnetic induction is safer and more reliable.

To achieve this purpose, the technical solution of the utility model is: a power cable for power transmission and distribution system, including a cable core, and the center of the cable core is a circular conductive composite conductor composed of five divided conductors, The conductor is covered with a conductor shielding layer, an insulating layer, an insulating shielding layer, a semi-conductive resistance water buffer layer, a corrugated aluminum sheath and an outer sheath from the inside to the outside in sequence, and there is a plating layer between the corrugated aluminum sheath and the outer sheath. Tin-copper wire plus galvanized steel wire compound stranded wire is wound around the reinforcing layer.

Preferably, the five segmented conductors are separated from each other by insulating crepe paper.

Preferably, a conductor or a paper twist filler is arranged at the center of the circular conductive assembly.

Preferably, the outer sheath is composed of a corrugated steel-plastic composite tape moisture barrier and a black polyethylene sheath, the outermost layer of which is coated with a graphite layer. the

Preferably, the outside of the annular conductive assembly is sequentially covered with a layer of semi-conductive nylon tape and a layer of non-woven protective layer.

Compared with the prior art, the conductor of the utility model is a split conductor formed by assembling five fan-shaped copper conductors, which has better flexibility, and at the same time, it is wrapped with multi-layer semiconducting resistance hoses, which will expand rapidly when encountering water, and can effectively Block the entry of moisture and prolong the service life of the cable. At the same time, it adopts a shielding structure composed of galvanized steel wire and tinned copper wire composite strands, which is wound between the corrugated aluminum sheath and the outer sheath in a spiral structure, which plays a role in inhibiting the emission of electromagnetic waves to the outside, and can also As a channel for short-circuit current, it acts as a protection for the neutral core.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of the utility model.

Among them: 1. Conductor; 2. Conductor shielding layer; 3. Insulation layer; 4. Insulation shielding layer; 5. Water-blocking buffer layer; 6. Corrugated aluminum sheath; 7. Outer sheath; 8. Tinned copper wire Add galvanized steel wire composite stranded wire around the reinforcement layer.

Detailed ways

The utility model is further described below in conjunction with embodiment with reference to accompanying drawing.

As shown in Figure 1, a power cable for a power transmission and distribution system includes a cable core, and the center of the cable core is a circular conductive composite conductor composed of five divided conductors, which are sequentially wrapped on the conductors from the inside to the outside. There are conductor shielding layer, insulating layer, insulating shielding layer, semi-conductive resistance water buffer layer, corrugated aluminum sheath and outer sheath, and there is a composite of tinned copper wire and galvanized steel wire between the corrugated aluminum sheath and outer sheath Stranded wires are wound around the reinforcement layer. Wherein, the five segmented conductors are separated from each other by insulating crepe paper. The center of the circular conductive assembly is provided with a conductor or a paper twist filler. The outer sheath is composed of a corrugated steel-plastic composite tape moisture barrier and a black polyethylene sheath overlapped longitudinally, and the outermost layer is coated with a graphite layer. A layer of semi-conductive nylon tape and a layer of non-woven protective layer are sequentially wrapped on the outside of the circular conductive assembly.

The utility model is mainly aimed at the improvement of the structure of the power cable used in the power transmission and distribution system. The above description is only a preferred embodiment of the utility model, and it does not limit the patent scope of the utility model. The simple changes and equivalent transformations made by the contents of the drawings and drawings should be included in the patent scope of the present utility model.

Claims (5)

1. power transmission and distribution system power cable, comprise cable core, it is characterized in that: described cable core center is the annular conduction assembly conductor that five milliken conductors form, on conductor, be surrounded by successively from inside to outside conductor shield, insulating barrier, insulation screen, semiconductive block water buffering belt, corrugated aluminum sheath and oversheath, between corrugated aluminum sheath and oversheath, be provided with tinned copper wire and add the zinc-coated wire composite twisted wire around reinforced layer.

2. power transmission and distribution system power cable according to claim 1, is characterized in that, described five milliken conductors separate with insulation crimped paper each other.

3. power transmission and distribution system power cable according to claim 1, is characterized in that, the center of described annular conduction assembly is provided with conductor or spill obturator.

4. power transmission and distribution system power cable according to claim 1, is characterized in that, described oversheath is comprised of wrinkle composite steel-plastic belt moisture-proof layer and the black polyethylene sheath of vertical bag overlap joint, its outermost layer coated graphite layer.

5. power transmission and distribution system power cable according to claim 1, is characterized in that, described annular conduction assembly outside is surrounded by 1 layer of semiconductive nylon tape and 1 layer of nonwoven fabrics protective layer successively.

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