CN205211465U - Insulating welding corrugated aluminium sheath polymer sheath power cable of middling pressure crosslinked polyethylene - Google Patents

Abstract

The utility model discloses a medium-voltage cross-linked polyethylene insulated welding corrugated aluminum-sheathed polymer sheathed power cable, which comprises a conductor core and semiconducting resistors that are sequentially coated on the outer surface of the conductor core from inside to outside. Water belt buffer layer, metal sheath asphalt layer and outer sheath layer, the conductor core includes a conductor and a conductor shielding layer, an insulating layer and an insulating shielding layer that are sequentially coated on the outer surface of the conductor from the inside to the outside, wherein The asphalt layer of the metal sheath includes a welded corrugated aluminum sheath layer on the inner layer and an asphalt anticorrosion layer on the outer layer. The utility model can not only meet the electrical and mechanical performance requirements of the power cable, but also has good water resistance and waterproof performance, and is especially suitable for 26/35kV AC rated voltage.

Description

Medium voltage XLPE insulated welding corrugated aluminum sheath polymer sheathed power cable

technical field

The utility model relates to the technical field of cables, in particular to a medium-voltage cross-linked polyethylene insulated and welded corrugated aluminum-sheathed polymer sheathed power cable.

Background technique

With the rapid development of the national economy, my country's electric power industry has developed rapidly. By 2013, the installed capacity of power generation equipment in the country will reach 65.4415 million kilowatts, and the power generation will reach 4.94 trillion kilowatt-hours. These two indicators have already ranked among the top in the world, marking that my country has entered the ranks of the world's largest power production and consumption countries. Piezoelectric cables will become a hot spot in the electricity market.

The existing 26/35kV medium-voltage power cables usually cannot meet the requirements of electrical and mechanical properties and water resistance and waterproof performance at the same time. 26/35kV XLPE insulated and welded corrugated aluminum sheath polymer outer sheath power cable with water resistance and waterproof performance.

Utility model content

In view of the above-mentioned problems and deficiencies in the prior art, the purpose of this utility model is to provide a medium-voltage cross-linked polyethylene that can not only meet the electrical and mechanical performance requirements of power cables, but also has good water resistance and waterproof performance. Insulated welded corrugated aluminum sheath polymer outer sheath power cable.

In order to achieve the above purpose, the utility model provides a medium-voltage cross-linked polyethylene insulated welding corrugated aluminum sheathed polymer sheathed power cable, the power cable includes a conductor core and is sequentially coated on the conductor core from the inside to the outside. A semi-conductive resistance hose buffer layer, a metal sheath asphalt layer and an outer sheath layer on the outer surface of the wire core, the conductor wire core includes a conductor and a conductor shielding layer coated on the outer surface of the conductor in sequence from the inside to the outside , an insulating layer and an insulating shielding layer, wherein the asphalt layer of the metal sheath includes a welded corrugated aluminum sheath layer on the inner layer and an asphalt anti-corrosion layer on the outer layer.

According to an embodiment of the medium voltage XLPE insulated and welded corrugated aluminum sheathed polymer sheathed power cable of the utility model, the conductor is a regular twisted and compacted circular conductor.

According to an embodiment of the medium voltage XLPE insulated and welded corrugated aluminum sheathed polymer sheathed power cable of the utility model, the conductor shielding layer is composed of wrapped semiconductive nylon tape and extruded ultra-smooth semiconductive material .

According to an embodiment of the medium voltage XLPE insulated and welded corrugated aluminum sheathed polymer sheathed power cable of the utility model, the buffer layer of the semiconducting resistance water belt is made of a longitudinal water blocking material, and the semiconducting resistance water belt The thickness of the buffer layer is 2-2.5mm.

According to an embodiment of the medium-voltage XLPE insulated and welded corrugated aluminum-sheathed polymer sheathed power cable of the utility model, the number of layers of the buffer layer of the semi-conductive resistance hose is 2 to 3 layers and the overlapping method is a seam wrap around.

According to an embodiment of the medium-voltage cross-linked polyethylene insulated welded wrinkled aluminum sheath polymer sheathed power cable of the utility model, the pitch anticorrosion layer is evenly coated on the outside of the welded wrinkled aluminum sheath with a thickness of 0.2-0.5mm .

According to an embodiment of the medium voltage cross-linked polyethylene insulated welding corrugated aluminum sheath polymer sheathed power cable of the utility model, the insulating layer is a cross-linked polyethylene insulating layer, and the outer sheath layer is a polyvinyl chloride outer sheath jacket, polyethylene outer sheath or polyolefin outer sheath.

According to an embodiment of the medium voltage XLPE insulated and welded corrugated aluminum sheath polymer sheathed power cable of the utility model, the number of the conductor cores is 1 or more than 2, when the number of the conductor cores is 2 In the above, the power cable further includes a filler arranged between the conductor core and the buffer layer of the semi-conductive resistance hose.

According to an embodiment of the medium voltage XLPE insulated and welded corrugated aluminum sheathed polymer sheathed power cable of the utility model, the power cable is suitable for 26/35kV AC rated voltage.

Compared with the prior art, the medium-voltage XLPE insulated and welded corrugated aluminum alloy sheathed polymer sheathed power cable of the utility model has the following advantages:

1) A semi-conductive resistance water tape buffer layer is added between the cable conductor core and the metal sheath, which not only ensures the conductivity between the metal sheath and the conductor core, but also avoids the hard contact between the insulating shielding layer and the metal sheath , In addition, the longitudinal water resistance performance is increased; at the same time, the aluminum alloy strip is welded into a sealed metal sleeve by argon arc welding process as the metal shielding layer, and it also has the radial waterproof function, which makes the water resistance performance of the power cable excellent.

2) The metal sheath is made of aluminum. Compared with the previous steel wire and steel belt sheath, it has the advantages of high tensile strength, strong corrosion resistance and low resistivity, which not only improves the mechanical properties of the cable, but also improves the cable performance. Corrosion resistance, while improving the ability of the cable to carry short-circuit current, especially for 26/35kV AC rated voltage.

3) The design of the utility model greatly reduces the weight of the cable, which is convenient for transportation and installation.

Description of drawings

Fig. 1 shows a schematic structural view of a medium-voltage XLPE insulated and welded corrugated aluminum alloy sheathed polymer sheathed power cable according to an exemplary embodiment of the present invention.

Fig. 2 shows a schematic structural view of a medium-voltage XLPE insulated and welded corrugated aluminum alloy sheathed polymer sheathed power cable according to another exemplary embodiment of the present invention.

Explanation of reference signs:

1-conductor, 2-conductor shielding layer, 3-insulation layer, 4-insulation shielding layer;

5-Semiconductive buffer belt water-blocking layer, 6-Metal sheath asphalt layer, 7-Outer sheath layer, 8-Filler.

detailed description

In the following, the medium-voltage cross-linked polyethylene insulated and welded corrugated aluminum alloy sheathed polymer sheathed power cable of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 shows a schematic structural view of a medium-voltage XLPE insulated and welded corrugated aluminum alloy sheathed polymer sheathed power cable according to an exemplary embodiment of the present invention.

As shown in Figure 1, according to an exemplary embodiment of the present utility model, a medium-voltage XLPE insulated and welded corrugated aluminum alloy sheathed polymer sheathed power cable and the wires that are sequentially coated on the outer surface of the conductor core from the inside to the outside Semi-conductive resistance hose buffer layer 5, metal sheath asphalt layer 6 and outer sheath layer 7, conductor core includes conductor 1 and conductor shielding layer 2 and insulating layer 3 that are coated on the outer surface of conductor 1 in turn from inside to outside and insulating shielding layer 4. Wherein, the asphalt layer 6 of the metal sheath includes the welded corrugated aluminum sheath layer of the inner layer and the asphalt anticorrosion layer of the outer layer.

Specifically, the number of conductor cores is 1 or more than 2. In this exemplary embodiment, the number of conductor cores is 1, then the conductor shielding layer 2, insulation layer 3 and insulation shielding layer 4 can be directly extruded or co-extruded on the conductor 1 from the inside to the outside to form a conductor Core. When the number of conductor cores is more than two, the power cable also includes a filler 8 arranged between the conductor cores and the buffer layer 5 of the semi-conductive resistance hose. The filler 8 can be a filler commonly used in the field.

Fig. 2 shows a schematic structural view of a medium-voltage XLPE insulated and welded corrugated aluminum alloy sheathed polymer sheathed power cable according to another exemplary embodiment of the present invention. As shown in FIG. 2 , in this exemplary embodiment, the number of conductor cores is three, and a filler 8 is provided between the conductor cores and the buffer layer 5 of the semiconductive resistance water belt.

According to the present invention, the conductor 1 is preferably a regular twisted and pressed circular conductor, but the present invention is not limited thereto.

Wherein, the conductor shielding layer 2 is directly coated on the conductor 1 , which is at the same potential as the shielded conductor 1 and in good contact with the insulating layer 3 , so as to avoid partial discharge between the conductor 1 and the insulating layer 2 . Moreover, setting the conductor shielding layer 2 can not only shield the electromagnetic field generated by the current in the cable in the cable, but also play a certain role of grounding protection and safety protection. The conductor shielding layer 2 is preferably composed of wrapped semi-conductive nylon tape and extruded ultra-smooth semi-conductive material.

The function of the insulating layer 3 is to isolate and insulate the live part of the cable from the outside, and also to protect the cable from external damage. According to the present invention, the insulating layer 3 is preferably a cross-linked polyethylene insulating layer.

Both the insulating shielding layer 4 and the conductor shielding layer 2 are for improving the electric field distribution of the cable. Adding a layer of insulating shielding layer 4 on the surface of the insulating layer 3, on the one hand, it plays the role of protecting the insulating wire core, on the other hand, it is in good contact with the insulating layer 3 and forms an equipotential on the insulating surface, which can effectively avoid the gap between the insulating layer and the shielding layer. Partial discharge occurring between jacket layers. According to the present invention, the insulating shielding layer 4 may be a semiconducting shielding layer made of a semiconductive material with a very low resistivity and a relatively thin thickness.

The semi-conductive resistance hose buffer layer 5, the metal sheath bitumen layer 6 and the outer sheath layer 7, which are sequentially coated on the outer surface of the conductor core from the inside to the outside, actually constitute the sheath of the power cable.

Among them, the buffer layer 5 of the semi-conductive resistance water belt has low resistance and semi-conductive properties, which can effectively buffer and weaken the electric field strength, and also has the function of water blocking. According to the present invention, the semiconductive resistance water buffer layer 5 is made of longitudinal water blocking material, and the thickness of the semiconductive resistance water band buffer layer is 2-2.5 mm, thereby realizing the function of longitudinal water resistance. Preferably, the number of layers of the buffer layer of the semi-conductive resistance hose is 2 to 3 layers, and the covering method is seam wrapping.

The utility model sets a semi-conductive resistance water tape buffer layer between the cable conductor core and the metal sheath, which not only ensures the conductivity between the metal sheath and the conductor core, but also avoids the hard contact between the insulating shielding layer and the metal sheath , more importantly, it also increases the longitudinal water resistance.

The asphalt layer of the metal sheath 6 includes the welded wrinkled aluminum sheath layer of the inner layer and the asphalt anticorrosion layer of the outer layer. Among them, the metal sheath welded into a sealed metal sheath with an aluminum strip and argon arc welding process is used as the metal shielding layer, which can achieve better shielding effect ; while the metal sheath is made of aluminum, which has the advantages of high tensile strength, strong corrosion resistance and low resistivity compared with the previous steel wire and steel strip sheaths, which not only improves the mechanical properties of the cable, but also improves the performance of the cable. Excellent corrosion resistance, while improving the ability of the cable to carry short-circuit current. Wherein, the welded corrugated aluminum sheath layer is preferably a spiral structure and the thread depth is 2-6mm, and it is further preferred that the welded corrugated aluminum sheath layer is a radial waterproof layer relative to the semiconductive resistance water belt buffer layer 5, Therefore, the cable has radial waterproof function.

The asphalt anti-corrosion layer is directly and evenly coated on the welded corrugated aluminum sheath layer with a thickness of 0.2-0.5 mm to further enhance the corrosion resistance.

The function of the outer sheath layer 7 is to prevent the conductor core from contacting with water, air or other substances, prevent the insulation from getting wet and protect the conductor core from mechanical damage. According to the present invention, the outer sheath layer 7 is a polymer sheath, and the outer sheath layer can be a polyvinyl chloride outer sheath layer, a polyethylene outer sheath layer or a polyolefin outer sheath layer.

The medium-voltage cross-linked polyethylene insulated and welded corrugated aluminum alloy sheathed polymer sheathed power cable of the utility model adds a semi-conductive resistance water belt buffer layer between the cable conductor core and the metal sheath, which not only ensures that the metal sheath and the conductor wire are The conductivity between the cores avoids the hard contact between the insulating shielding layer and the metal sleeve, and also increases the longitudinal water resistance; at the same time, the aluminum metal sleeve is used as the metal shielding layer, and it also has radial waterproof function, making the power The water resistance of the cable is excellent. The optimized design of the structure and materials not only improves the mechanical properties of the cable, but also improves the corrosion resistance of the cable, and at the same time improves the ability of the cable to carry short-circuit current, especially for 26/35kV AC rated voltage.

Although the medium voltage XLPE insulated welded corrugated aluminum alloy sheathed polymer sheathed power cable of the present invention has been described above in conjunction with exemplary embodiments, it should be clear to those skilled in the art that without departing from the spirit and spirit of the claims Various modifications and changes can be made to the above-described embodiments within the scope of the present invention.

Claims (9)

1. A medium-voltage XLPE insulated and welded corrugated aluminum sheathed polymer sheathed power cable, characterized in that the power cable includes a conductor core and is sequentially coated on the outer surface of the conductor core from inside to outside The semi-conductive resistance hose buffer layer, the metal sheath asphalt layer and the outer sheath layer, the conductor core includes a conductor and a conductor shielding layer, an insulating layer and an insulating layer coated on the outer surface of the conductor from inside to outside in sequence The insulating shielding layer, wherein, the asphalt layer of the metal sheath includes a welded corrugated aluminum sheath layer on the inner layer and an asphalt anti-corrosion layer on the outer layer. 2. The medium-voltage cross-linked polyethylene insulated and welded corrugated aluminum sheathed polymer sheathed power cable according to claim 1, wherein the conductor is a regular twisted and pressed round conductor. 3. The medium-voltage cross-linked polyethylene insulated and welded corrugated aluminum sheathed polymer sheathed power cable according to claim 1, wherein the conductor shielding layer consists of wrapped semi-conductive nylon tape and extruded ultra-smooth Composed of semiconducting materials. 4. The medium-voltage cross-linked polyethylene insulated and welded corrugated aluminum-sheathed polymer sheathed power cable according to claim 1, wherein the buffer layer of the semi-conductive resistance water belt is made of a longitudinal water-blocking material, and the The thickness of the buffer layer of the semiconducting resistance water belt is 2-2.5mm. 5. The medium-voltage cross-linked polyethylene insulated and welded corrugated aluminum-sheathed polymer sheathed power cable according to claim 4, characterized in that, the number of layers of the buffer layer of the semi-conductive resistance water belt is 2 to 3 layers and overlaps The cover method is seam wrapping. 6. The medium-voltage XLPE insulated and welded corrugated aluminum sheathed polymer sheathed power cable according to claim 1, wherein the bitumen anti-corrosion layer is evenly coated on the outside of the welded corrugated aluminum sheath layer and has a thickness of 0.2 ~ 0.5mm. 7. The medium-voltage cross-linked polyethylene insulated and welded corrugated aluminum sheathed polymer sheathed power cable according to claim 1, wherein the insulating layer is a cross-linked polyethylene insulating layer, and the outer sheath layer is PVC outer sheath, polyethylene outer sheath or polyolefin outer sheath. 8. The medium voltage XLPE insulated and welded corrugated aluminum sheathed polymer sheathed power cable according to claim 1, characterized in that the number of said conductor cores is 1 or more, when the conductor core When the number is more than 2, the power cable also includes a filler arranged between the conductor core and the buffer layer of the semi-conductive resistance water belt. 9. The medium-voltage XLPE insulated and welded corrugated aluminum sheathed polymer sheathed power cable according to claim 1, wherein the power cable is suitable for 26/35kV AC rated voltage.