CN201838380U - Power cable - Google Patents

Abstract

The utility model relates to a power cable, which belongs to the field of power equipment. The power cable is characterized in that it consists of an outer semiconductive layer, a non-metallic outer protective layer, a metal sheath, a semiconductive resistance water buffer layer, an insulating shielding layer, an insulating Layer, conductor shielding layer, conductor, the conductor is set at the center, conductor shielding layer, insulating layer, insulating shielding layer, semiconductive resistance water buffer layer, metal sheath, non-metallic outer protective layer, outer semiconductive layer Layer by layer in turn. The middle of the conductor is a circular conductor, and the surrounding is a trapezoidal or Z-shaped single-wire conductor that cooperates and surrounds the circular conductor. The utility model has the advantages of reasonable structural design, high compression coefficient, good surface smoothness and good cable performance.

Description

a power cable

technical field

The utility model relates to a power cable, which belongs to the field of power equipment, and is especially suitable for power cables with a voltage level of 110kV and above.

Background technique

The conductor of the traditional conductor structure power cable is made of ordinary round aluminum or copper monofilament twisted, the twisting process

In this structure, due to technical reasons, the maximum conductor compression coefficient can only reach 0.92. After the conductor passes through the compression mold, the surface flatness of the cable conductor is not high, which may easily cause the interface between the conductor shielding layer and the insulating layer to be rough. The monofilament surface is prone to burrs, which is detrimental to cable miniaturization and electrical performance. The utilization rate of the conductor section is low, and the partial discharge of the cable is large.

Utility model content

The technical problem to be solved by the utility model is to provide a power cable with reasonable structure design, high compression coefficient, good surface smoothness and good cable performance.

The technical scheme adopted by the utility model to solve the above-mentioned technical problems is the power cable, which is characterized in that it consists of an outer semiconductive layer, a non-metallic outer protective layer, a metal sheath, a semiconductive resistance water buffer layer, an insulating shielding layer, and an insulating layer. , conductor shielding layer and conductor, the conductor is set at the center, conductor shielding layer, insulating layer, insulating shielding layer, semiconductive resistance water buffer layer, metal sheath, non-metallic outer protective layer, outer semiconductive layer in sequence layer by layer. The middle of the conductor is a circular conductor, and the surrounding is a trapezoidal or Z-shaped single-wire conductor that cooperates and surrounds the circular conductor.

In the Z-shaped single-wire conductor described in the utility model, each single-wire overlaps with each other, and the bottom of each single-wire is placed on the top of its adjacent single-wire, and the trapezoidal single-wire conductors are mutually matched and superimposed. Even if one of the Z-shaped single-wire conductors is broken, it is not easy to cause the whole wire to loose strands. The trapezoidal wire also has a compact structure, and the wire is not easy to loose, but when a single wire breaks, the wedge-shaped section of the single wire weakens the binding force on other single wires, causing the single wire to leave the conductor, which may eventually lead to loosening and loose strands of the wire.

The material of the conductor described in the utility model is copper or aluminum. The diameter can be determined according to the nominal cross-section required by the product, and the outer diameter of the conductor is smaller than that of an ordinary circular compact conductor of the same cross-section.

The conductor shielding layer described in the utility model is made of semi-conductive material, and its thickness and structural composition can be adjusted accordingly according to the provisions of national standards on corresponding voltage levels and specifications. For example, in the production of 220kV power cables, the conductor shielding is composed of semi-conductive nylon tape wrapping and super-smooth semi-conductive shielding material extruded. The thickness of the wrapping layer is 0.5mm, and the thickness of the extruded layer is 1.5mm.

The insulating layer described in the utility model is made of materials that meet the voltage level requirements of corresponding cable products, and the thickness can be determined according to the relevant requirements of national standards.

The insulating shielding layer described in the utility model adopts the material conforming to the voltage level of the corresponding cable product, for example, the voltage level of 110kV and above adopts an ultra-smooth semi-conductive shielding material with a thickness of 1.0mm.

The semi-conductive resistance water buffer layer described in the utility model is formed by wrapping a semi-conductive resistance common water-blocking tape and a semi-conductive buffer water-blocking tape, with a thickness of 3mm.

The metal sheath described in the utility model adopts a welded corrugated aluminum sheath structure or an extruded corrugated aluminum sheath structure, and the thickness meets the requirements of the national standard for corresponding voltage levels and specifications.

The non-metal outer protective layer described in the utility model adopts polyethylene material or polyvinyl chloride material, and can also adopt materials meeting special requirements such as flame retardancy and termite prevention. The thickness meets the requirements of national standards for corresponding voltage levels and specifications.

The outer semiconductive layer described in the utility model is coated with graphite or extruded with semiconductive polyethylene. The thickness is 0.05mm when coated with graphite, and 0.3mm when extruded with semiconductive polyethylene.

Compared with the prior art, the utility model has the following advantages and effects: the profiled conductor of the utility model can increase the conductor compression coefficient to above 0.96, improve the surface smoothness of the conductor after stranding, and prevent the burr on the conductor surface from entering the insulating layer , to improve cable performance. This structure is especially suitable for power cables with a voltage level of 110kV and above. The patented technology of the utility model can effectively improve the stability of the electrical performance of the cable and reduce the manufacturing cost of the cable. Since the profiled conductor has a larger compression coefficient and a smoother conductor surface, it can effectively reduce the cable under the same cross-section. The small conductor size, the saving of insulating material and the material consumption of the metal sheath including the non-metal outer sheath contribute to the miniaturization of the cable. Save cable manufacturing cost. Because the surface of the conductor is smoother, tighter and flatter, it can achieve lower partial discharge. This technology is applicable to both copper core cross-linked power cables and aluminum core cross-linked power cables. Compared with the traditional conductor structure power cable technology, the structure production process and manufacturing technology of this application are easy to realize. Because of the difference in conductor structure, the profiled conductor power cable improves the conductor compression coefficient and increases the utilization of the conductor cross section. Due to the profiled conductor It has a larger compression coefficient and a smoother conductor surface, so in the case of the same cross-section, the conductor size can be effectively reduced, and the insulation layer and other outer layer materials can be saved. Since the surface of the conductor is smoother, tighter and flatter, the partial discharge of the cable can be reduced and the performance of the cable can be improved.

Description of drawings

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

Fig. 2 is another structural schematic diagram of the cross-section of the present invention.

Detailed ways

The utility model is further described in detail below in conjunction with the examples, the following examples are explanations of the utility model and the utility model is not limited to the following examples.

Embodiment 1: As shown in FIG. 1 , this embodiment describes a power cable, the voltage level of which is 127/220kV 1×630mm ² . The power cable, from the outside to the inside, is: outer semiconductive layer 1, non-metallic outer protective layer 2, metal sheath 3, semiconductive resistance water buffer layer 4, insulating shielding layer 5, insulating layer 6, conductor shielding layer 7 , Conductor 8. Wherein the conductor 8 is set at the center, the middle of the conductor 8 is a circular conductor, and the surrounding is a trapezoidal single-wire conductor that cooperates and surrounds the circular conductor. The conductor 8 is a copper conductor, and the conductor shielding layer 7 is composed of a semiconductive wrapping layer and an extruded semiconductive layer. The semiconductive wrapping layer is wrapped by a semiconductive nylon tape, with an approximate thickness of 0.25mm; The conductive layer is composed of ultra-smooth semi-conductive shielding material, with an approximate thickness of 1.5mm; the insulating layer 6 is made of materials that meet the voltage level requirements of the corresponding cable products, with a thickness of 26mm. The insulating shielding layer 5 adopts ultra-smooth semi-conductive shielding material with a thickness of 1.0mm. The semi-conductive resistance water buffer layer 4 is wrapped with a double-layer semi-conductive buffer water-blocking tape, with an approximate thickness of 4 mm. The metal sheath 3 adopts a welded corrugated aluminum sheath structure with a thickness of 2.4mm, and the depth and pitch of the corrugations meet the cable bending performance requirements. The non-metallic outer protective layer is made of 90°C high electrical performance polyvinyl chloride material, with a nominal thickness of 5.0mm. The outer semiconductive layer is made of semiconductive polyethylene extruded cladding, and the approximate thickness of the semiconductive polyethylene extruded cladding is 0.3mm.

Embodiment 2: As shown in FIG. 2 , this embodiment describes a power cable, the voltage level of which is 64/110kV 1×500mm ² . The power cable, from the outside to the inside, is: outer semiconductive layer 1, non-metallic outer protective layer 2, metal sheath 3, semiconductive resistance water buffer layer 4, insulating shielding layer 5, insulating layer 6, conductor shielding layer 7 , Conductor 8. Wherein the conductor 8 is set at the center, the middle of the conductor 8 is a circular conductor, and the surrounding is a Z-shaped single-wire conductor that cooperates and surrounds the circular conductor. Each single wire in the Z-shaped single wire conductor overlaps each other, and the bottom of each single wire is placed on the top of its adjacent single wire. The conductor 8 is an aluminum conductor, and the conductor shielding layer 7 is composed of a semiconductive wrapping layer and an extruded semiconductive layer. The semiconductive wrapping layer is wrapped by a semiconductive nylon tape, with an approximate thickness of 0.25mm. , the extruded semi-conductive layer consists of an ultra-smooth semi-conductive shielding material. The approximate thickness is 1.2mm. The insulating layer 6 is made of a material that meets the voltage level requirements of the corresponding cable product. The nominal thickness is 17.0mm. The insulating shielding layer adopts ultra-smooth semi-conductive shielding material with a thickness of 1.0mm. The semiconductive resistance water buffer layer 4 is formed by wrapping a semiconductive resistance common water-blocking tape plus a semi-conductive buffer water-blocking tape, with an approximate thickness of 3 mm. The metal sheath 3 adopts an extruded corrugated aluminum sheath structure with a thickness of 2.0mm, and the depth and pitch of the corrugation meet the requirements of cable bending performance. The non-metallic outer protective layer is made of black medium density polyethylene material with a nominal thickness of 4.0mm. The outer semiconducting layer is coated with graphite, and the approximate thickness when graphite is coated is 0.05mm.

In the above embodiments, in the process of production and processing, errors and inhomogeneities inevitably occur in the thickness of various structures, so the term "approximate thickness" is used.

In addition, it should be noted that the specific embodiments described in this specification may be different in terms of parts, shapes and names of components. All equivalent or simple changes made according to the structure, features and principles described in the utility model patent concept are included in the protection scope of the utility model patent. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the definition defined in the claims scope, all should belong to the protection scope of the present utility model.

Claims (9)

1. A power cable is characterized in that it is composed of an outer semiconductive layer, a non-metallic outer protective layer, a metal sheath, a semiconductive resistance water buffer layer, an insulating shielding layer, an insulating layer, a conductor shielding layer, and a conductor, said The conductor is set at the center, and the conductor shielding layer, insulating layer, insulating shielding layer, semiconductive resistance water buffer layer, metal sheath, non-metallic outer protective layer, and outer semiconductive layer are laid out layer by layer. It is a circular conductor surrounded by trapezoidal or Z-shaped single-wire conductors that cooperate with each other and surround the circular conductor. 2. The power cable according to claim 1, characterized in that: each single wire in the Z-shaped single wire conductor overlaps each other, the bottom of each single wire is placed on the top of its adjacent single wire, and the trapezoidal single wire conductor Cooperate with each other. 3. The power cable according to claim 1, characterized in that: said conductor is made of copper or aluminum. 4. The power cable according to claim 1, characterized in that: the conductor shielding layer is made of semi-conductive materials, and when producing 220kV power cables, the conductor shielding is wrapped with semi-conductive nylon tape and super-smooth semi-conductive shielding The structural composition of the material extruded package, wherein the thickness of the wrapping layer is 0.5mm, and the thickness of the extruded cladding layer is 1.5mm. 5. The power cable according to claim 1, wherein the insulating shielding layer is made of ultra-smooth semi-conductive shielding material with a thickness of 1.0mm when producing cables with a voltage level of 110kV and above. 6. The power cable according to claim 1, characterized in that: the semi-conductive resistance water-blocking layer is wrapped with a semi-conductive resistance common water-blocking tape and a semi-conductive buffer water-blocking tape, with a thickness of 3 mm. 7. The power cable according to claim 1, characterized in that: said metal sheath adopts welded corrugated aluminum or extruded corrugated aluminum sheath structure. 8. The power cable according to claim 1, characterized in that: said non-metallic outer protective layer is made of polyethylene or polyvinyl chloride. 9. The power cable according to claim 1, characterized in that: the outer semiconductive layer is coated with graphite or extruded with semiconductive polyethylene, the thickness is 0.05mm when coated with graphite, and semiconductive polyethylene is used When the cladding is extruded, the thickness is 0.3mm.

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