CN204348423U - Aluminum-alloy wire shielding high-tension cable - Google Patents

Abstract

This utility model discloses an aluminum alloy wire shielded high-voltage cable, comprising a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, an aluminum alloy wire armor layer, and an outer sheath sequentially wrapped around the conductor. A first pad layer is provided on the side of the aluminum alloy wire armor layer closest to the conductor, and a second pad layer is provided on the other side of the aluminum alloy wire armor layer away from the conductor. An aluminum-plastic composite tape is also provided outside the second pad layer. Implementing this utility model can eliminate eddy current effects and provides good bending resistance and shielding effect.

Description

Aluminum alloy wire shielded high voltage cable

technical field

The utility model relates to a high-voltage power cable, in particular to an aluminum alloy wire-shielded high-voltage cable.

Background technique

my country's 110KV and 220KV EHV cables are widely used in power systems. The use of ultra-high voltage cables is laid in a variety of environments, and the requirements for cables are different for different environments. The current manufacturing of ultra-high voltage cables is basically a model, and the waterproof structure is generally a wrapped water-blocking tape. Longitudinal waterproofing, welded or extruded aluminum sleeves are used as radial waterproofing. Such products can meet waterproofing requirements, but for environments with low waterproofing requirements, or even no waterproofing environment (indoor or anhydrous environment), the manufacturing cost of this product is very low. higher. In addition, in the field of ultra-high-voltage cable manufacturing, when welding or extruding the corrugated aluminum sheath, improper temperature control may easily cause damage to the insulating core, resulting in potential product defects and lower product performance; High, fault single-phase short-circuit current is large, and must also be considered in structure.

The utility model proposes an aluminum wire shielded ultra-high-voltage power cable designed for an anhydrous environment and without bearing tension during vertical laying. The cable is not easy to damage the inner insulating core during the production process, and the cable meets the performance requirements. The cost is basically reduced, and the aluminum wire armor layer can also meet the requirements for single-phase short circuit. Existing technology, such as 03235978.0 discloses an aluminum alloy wire armored cable, the aluminum alloy wire armor layer is located between the filler layer and the jacket layer, and there is no shielding layer outside the aluminum alloy wire armor layer, which cannot completely Eliminate the generation of eddy current; 200510095191.5 discloses a new type of shielded cable. The shielding layer of this case is copper-clad aluminum or copper-clad aluminum alloy wire. The shielding effect can achieve the ideal effect, but the bending resistance of copper is poor, and the copper will be damaged It affects other electrical equipment and reduces the service life of the cable, which shows that the prior art has a need for further improvement.

Utility model content

The utility model provides an aluminum alloy wire shielded high-voltage cable, which can eliminate the generation of eddy current effects, and has good bending resistance and shielding effect.

The technical scheme of the utility model is achieved in that:

An aluminum alloy wire shielded high-voltage cable is characterized in that it includes a conductor, a conductor shielding layer, an insulating layer, an insulating shielding layer, an aluminum alloy wire armor layer and an outer sheath wrapped in sequence outside the conductor, and the aluminum alloy wire The alloy wire armor layer is provided with a first cushion layer on one side close to the conductor, and a second cushion layer is provided on the other side of the aluminum alloy wire armor layer away from the conductor, and the second cushion layer There is also a layer of aluminum-plastic composite tape on the outside, wherein the thickness of the first cushion layer is 0.2mm, the outer diameter of the first cushion layer is 25mm, the thickness of the second cushion layer is 0.5mm, and the second cushion layer is The outer diameter of the cushion is 30mm.

In the aluminum alloy wire-shielded high-voltage cable of the present utility model, the first cushion layer and the second cushion layer are PVC tapes.

In the aluminum alloy wire shielded high-voltage cable of the present utility model, the aluminum alloy wire armor layer adopts Al-Mg-Si alloy wire.

In the aluminum alloy wire-shielded high-voltage cable of the present utility model, the diameter of the conductor is 16mm.

In the aluminum alloy wire-shielded high-voltage cable of the present invention, the thickness of the aluminum alloy wire armor layer is 0.05 times the diameter of the aluminum alloy wire-shielded high-voltage cable.

In the aluminum alloy wire shielded high-voltage cable of the present invention, the thickness of the aluminum alloy wire armor layer is equal to the thickness of the aluminum-plastic composite tape layer.

In the aluminum alloy wire shielded high voltage cable of the present invention, the diameter of the aluminum alloy wire shielded high voltage cable is 37.5 mm, the thickness of the outer sheath is 2.6 mm, and the outer diameter of the insulating layer is at least 29 mm.

The aluminum alloy wire shielded high-voltage cable implementing the utility model has the following beneficial effects: adding a cushion layer in the aluminum alloy wire armor layer can completely eliminate eddy current loss, and adding a layer of aluminum alloy wire outside the second cushion layer The plastic composite tape can enhance the anti-interference effect of the cable and isolate the interference of the external electromagnetic field.

Description of drawings

Fig. 1 is a schematic cross-sectional view of this aluminum alloy wire shielded high-voltage cable of the present utility model;

FIG. 2 is an enlarged schematic view of FIG. 1 .

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

This aluminum alloy wire shielded high voltage cable 100 of the present invention as shown in Fig. 1 to Fig. 2, it comprises a conductor 101, and the conductor shielding layer 102, the insulating layer 103, the insulating shielding layer 104 wrapped in this conductor 101 in turn , an aluminum alloy wire armor layer 106 and an outer sheath 109, a first cushion layer 105 is arranged on the side of the aluminum alloy wire armor layer 106 close to the conductor 101, and a first cushion layer 105 is arranged on the aluminum alloy wire armor layer 106 A second pad layer 107 is provided on the other side away from the conductor 101 , and a layer of aluminum-plastic composite tape 108 is provided outside the second pad layer 107 . The cross-section of the high-voltage cable is sheathed layered, and from the inside to the outside are the conductor 101, the conductor shielding layer 102, the insulating layer 103, the insulating shielding layer 104, the first cushion layer 105, the aluminum alloy wire armor layer 106, the second Cushion layer 107 , aluminum-plastic composite tape 108 and outer sheath 109 . The utility model is a multi-layer composite structure. From the perspective of cost saving and environmental pollution, the materials of each layer are reasonably stacked to improve the structure. Cable production also eliminates the use of asphalt in existing cables, which not only saves energy, but also does not produce any environmental pollution.

Fig. 2 shows the preferred size of the aluminum alloy wire shielded high voltage cable 100 of the present application, the thickness of the first cushion layer 105 and the second cushion layer 107 is an important feature of the utility model, in addition, the aluminum alloy wire armor layer 106 and The aluminum-plastic composite tape 108 can be optimized to ensure that the cable 100 is resistant to external mechanical forces and has certain bending properties. Preferably, the diameter R of the aluminum alloy wire shielded high-voltage cable 100 is 37.5mm, the aluminum alloy wire armor layer 106f=aluminum-plastic composite tape 108h=2mm, and the thickness of the aluminum alloy wire armor layer 106 is preferably 0.05R choose. The first cushion layer 105e=0.2mm, the outer diameter of the first cushion layer is 25mm, the distance between the aluminum alloy wire armor layer 106 and the aluminum-plastic composite tape 108 is relatively close, and the thickness of the second cushion layer 107 increases accordingly, The second cushion layer 107g=0.5mm, and the outer diameter of the second cushion layer is 30mm. The first cushion layer 105 can completely eliminate the eddy current loss of the current, and the second cushion layer 107 can prevent the partial discharge of the aluminum alloy wire armor layer 106 and the aluminum-plastic composite tape 108. It is simple and effective under the condition of meeting the ultra-high voltage cable laying environment. It effectively solves the problem that the shielding layer cannot bear the single-phase fault short-circuit current, and the problem that the vertical laying needs to bear a large tensile force.

As a preferred embodiment of the present utility model, the diameter a=16mm of the conductor 101, the thickness b=0.5mm of the conductor shielding layer 102, the insulating shielding layer 104d=0.5mm, the insulating layer 103c=6.5mm, the insulating layer 103 The outer diameter is 29 mm, which can effectively protect the conductor 101 and avoid partial discharges between the conductor 101 and the aluminum alloy wire armor layer 106 caused by defects such as cracks on the surface of the insulating layer 103 . The outer sheath 109 is made of high flame-retardant and oil-sludge-resistant neoprene, and its thickness l=2.6mm.

The utility model solves the problem of eliminating eddy current loss and improving the anti-interference ability of cable shielding, which mainly involves the change of cross-sectional lamination structure and size, and does not involve each layer of material. The names of the materials of each layer are generally explained. For example, the conductor 101 is made of multiple stranded copper conductors and water-blocking yarn, and the conductor shielding layer 102 is extruded from semiconductor materials, which improves the cable shielding performance and effectively protects the transmission of cable information. stability; the insulating layer 103 is made of polytetrafluoroethylene insulating layer, the insulating shielding layer 104 is made of semi-conductive ethylene propylene rubber, the first cushion layer 105 and the second cushion layer 107 are made of PVC tape, and the aluminum alloy wire armor layer 106 is made of Al-Mg-Si alloy wire with high flexibility. In addition, for materials not exhaustive in this embodiment, reference may be made to relevant explanations of the prior art.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in the Within the protection scope of the present utility model.

Claims (7)

1. An aluminum alloy wire shielded high-voltage cable is characterized in that: it comprises a conductor, and the conductor shielding layer, insulating layer, insulating shielding layer, aluminum alloy wire armoring layer and outer sheath that are wrapped in the outer conductor successively, The aluminum alloy wire armor layer is provided with a first cushion layer on one side close to the conductor, and a second cushion layer is provided on the other side of the aluminum alloy wire armor layer away from the conductor, and the second There is also a layer of aluminum-plastic composite tape on the outside of the cushion, wherein the thickness of the first cushion is 0.2mm, the outer diameter of the first cushion is 25mm, and the thickness of the second cushion is 0.5mm. The outer diameter of the second cushion layer is 30mm. 2. The aluminum alloy wire-shielded high-voltage cable according to claim 1, characterized in that: the first cushion layer and the second cushion layer are PVC tapes. 3. The aluminum alloy wire shielded high-voltage cable according to claim 1, characterized in that: the aluminum alloy wire armor layer is surrounded by Al-Mg-Si alloy wires. 4. The aluminum alloy wire-shielded high-voltage cable according to claim 1, wherein the diameter of the conductor is 16mm. 5. The aluminum alloy wire-shielded high-voltage cable according to claim 1, wherein the thickness of the aluminum alloy wire armor layer is 0.05 times the diameter of the aluminum alloy wire-shielded high-voltage cable. 6. The aluminum alloy wire-shielded high-voltage cable according to claim 1, characterized in that: the thickness of the aluminum alloy wire armor layer is equal to the thickness of the aluminum-plastic composite tape layer. 7. The aluminum alloy wire-shielded high-voltage cable according to claim 1, characterized in that: the diameter of the aluminum alloy wire-shielded high-voltage cable is 37.5 mm, the thickness of the outer sheath is 2.6 mm, and the outer sheath of the insulating layer diameter of at least 29mm.