A 500kV large cross-section smooth aluminum sleeve nylon outer sheath ultra-high voltage cable

Abstract

The utility model relates to power cable technical field especially relates to a 500kV big section smooth aluminium cover nylon outer sheath superhigh voltage cable. Its technical scheme includes the conductor, the conductor's outside is wrapped and is used for inhibiting partial discharge semiconductive nylon belt, the semiconductive nylon belt's outside is equipped with the inner shielding layer of inhibiting partial discharge, the inner shielding layer's outside is equipped with the insulating layer, the insulating layer's outside is equipped with the outer shielding layer for eliminating the surface electric field distortion of insulating layer, the utility model discloses the setting of smooth aluminium cover, can realize the uniform distribution of electric field inhibits capacitive discharge, can effectively avoid cable partial whitening, burning and breakdown problem, can also avoid the problem that the loading amount is small because of increasing cable outer diameter, still through the setting of nylon outer sheath body, can improve the mechanical strength and surface hardness of cable, can reduce the cable accident probability that cable is gnawed by small animals.

Description

Technical Field

[0001] This utility model relates to the field of power cable technology, and in particular to a 500kV large-section smooth aluminum-sheathed nylon outer sheath ultra-high voltage cable. Background Technology

[0002] Ultra-high voltage power cables, as a key carrier of power transmission, occupy a core position in the power transmission system, and their stable operation is directly related to my country's power security. In the application fields of high-voltage cables in China, there are various types of metal sheaths, among which corrugated aluminum sheaths, corrugated copper sheaths, and lead sheaths are the main types. Data shows that over 90% of the high-voltage cross-linked cables in operation in China use corrugated aluminum sheaths as their metal protective structure.

[0003] Because the corrugated aluminum sheath is corrugated, the contact between the aluminum sheath and the insulated core is a linear point contact, which is prone to capacitive discharge during operation. After long-term use, problems such as local whitening, burning and cable breakdown may occur in the high-voltage cable. At the same time, the corrugated aluminum sheath increases the outer diameter of the cable, resulting in a small reel size. In view of the above reasons, this application proposes a 500kV large-section smooth aluminum sheath nylon outer sheath ultra-high voltage cable. Utility Model Content

[0004] The purpose of this utility model is to address the problems existing in the background technology by proposing a 500kV large-section smooth aluminum-sheathed nylon outer sheath ultra-high voltage cable.

[0005] The technical solution of this utility model is as follows: A 500kV large-section smooth aluminum-sheathed nylon outer sheath ultra-high voltage cable, comprising a conductor, the conductor being wrapped with a semi-conductive nylon tape for suppressing partial discharge, the semi-conductive nylon tape being surrounded by an inner shielding layer for suppressing partial discharge, the inner shielding layer being surrounded by an insulating layer, the insulating layer being surrounded by an outer shielding layer for eliminating electric field distortion on the surface of the insulating layer, the outer shielding layer being wrapped with a semi-conductive high-temperature resistant buffer water-blocking tape, the semi-conductive high-temperature resistant buffer water-blocking tape being surrounded by a smooth aluminum sheath body for protection, the smooth aluminum sheath body being surrounded by a polyethylene inner sheath, and the polyethylene inner sheath being surrounded by a nylon outer sheath body.

[0006] Optionally, a hot melt adhesive layer is provided between the smooth aluminum sleeve body and the polyethylene inner sheath, and the thickness of the hot melt adhesive layer is 0.1-0.2mm.

[0007] Optionally, an adhesive is filled between the polyethylene inner sheath and the nylon outer sheath body, and the adhesive has a thickness of 0.1 mm.

[0008] Optionally, the outer surface of the nylon outer sheath body is coated with a graphite layer for reducing cable loss and voltage, and a fixing component for fixing the cable is provided on the outside of the graphite layer.

[0009] Optionally, the fixing assembly includes a base for installation, a lower fixing seat fixedly provided on the top of the base, an upper fixing seat movably provided on the top of the lower fixing seat, two baffles fixedly provided on the outside of the lower fixing seat, and cushioning pads fixedly provided on the top of the lower fixing seat and the bottom of the upper fixing seat.

[0010] Optionally, the top of the lower fixing seat is provided with two slots, and each of the two slots is provided with two limiting slots and positioning slots on the side away from each other. The bottom of the upper fixing seat is fixedly provided with two insert plates, and a positioning post is movably provided on one side of each insert plate. The positioning post and the positioning slot are adapted to each other.

[0011] Optionally, two limiting strips are fixedly provided on one side of the insert plate, and the limiting strips are movably connected to the limiting grooves. A storage hole is provided on one side of the insert plate, and a spring is fixedly provided in the storage hole. The same guide plate is fixedly provided between the spring and the positioning post. Slider blocks are fixedly provided on both sides of the guide plate. Sliding grooves are provided on both sides of the inner wall of the storage hole, and the sliders are movably connected to the sliding grooves.

[0012] Compared with the prior art, the present invention has the following beneficial technical effects:

[0013] 1. This utility model, through the setting of the smooth aluminum sleeve, can achieve uniform distribution and suppression of capacitive discharge in the power plant, effectively avoiding problems such as local whitening, burning and breakdown of the cable. At the same time, it can also avoid the problem of small reel capacity due to increasing the outer diameter of the cable. Furthermore, through the setting of the nylon outer sheath body, it can improve the mechanical strength and surface hardness of the cable, and reduce the probability of cable accidents caused by small animals gnawing on the cable.

[0014] 2. This utility model, through the arrangement of a base, a lower fixed seat, an upper fixed seat, a positioning post, a positioning groove, a plug plate, and a spring, enables the cable to be quickly fixed without the need for special tools to rotate the nut, thus improving installation efficiency. Attached Figure Description

[0015] Figure 1 A three-dimensional structural schematic diagram of this utility model is provided;

[0016] Figure 2 An exploded view of the fixing component in this utility model is provided;

[0017] Figure 3 An enlarged structural schematic diagram of point A in this utility model is provided;

[0018] Figure 4 An enlarged structural schematic diagram of point B in this utility model is provided.

[0019] Figure label:

[0020] 1. Conductor;

[0021] 2. Semi-conductive nylon tape;

[0022] 3. Inner shielding layer;

[0023] 4. Insulation layer;

[0024] 5. Outer shielding layer;

[0025] 6. Semi-conductive, high-temperature resistant, buffer, and water-blocking tape;

[0026] 7. Smooth aluminum sleeve body;

[0027] 8. Hot melt adhesive layer;

[0028] 9. Polyethylene inner sheath;

[0029] 10. Adhesives;

[0030] 11. Nylon outer sheath body;

[0031] 12. Graphite layer;

[0032] 13. Fixing component; 131. Base; 132. Lower fixing seat; 133. Slot; 134. Limiting slot; 135. Positioning slot; 136. Baffle; 137. Upper fixing seat; 138. Insert plate; 139. Storage hole; 1310. Spring; 1311. Guide plate; 1312. Positioning post; 1313. Slider; 1314. Limiting strip; 1315. Buffer pad. Detailed Implementation

[0033] The technical solutions of this disclosure will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments.

[0034] The components of the embodiments of this disclosure, which are typically described and shown in the accompanying drawings, can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of embodiments of this disclosure provided in the drawings is not intended to limit the scope of the claimed disclosure, but merely to illustrate selected embodiments of the disclosure.

[0035] All other embodiments obtained by those skilled in the art based on the embodiments in this disclosure without inventive effort are within the scope of protection of this disclosure.

[0036] In the description of this disclosure, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0037] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0038] Example

[0039] like Figure 1-4As shown, this utility model proposes a 500kV large-section smooth aluminum-sheathed nylon outer sheath ultra-high voltage cable, including a conductor 1. The conductor 1 is wrapped with a semi-conductive nylon tape 2 for suppressing partial discharge. The semi-conductive nylon tape 2 is surrounded by an inner shielding layer 3 for suppressing partial discharge. The inner shielding layer 3 is surrounded by an insulation layer 4. The insulation layer 4 is surrounded by an outer shielding layer 5 for eliminating electric field distortion on the surface of the insulation layer 4. The outer shielding layer 5 is wrapped with a semi-conductive high-temperature resistant buffer water-blocking tape 6. The semi-conductive high-temperature resistant buffer water-blocking tape 6 is surrounded by a smooth aluminum sheath body 7 for protection. The smooth aluminum sheath body 7 has a much smaller outer diameter than corrugated aluminum cables, which can reduce material costs and packaging and transportation costs. In cable laying pipes with the same inner diameter, it can accommodate a larger diameter and more cables. The smooth aluminum sheath body 7 is surrounded by a polyethylene inner sheath 9. The smooth aluminum sheath body 7 and the polyethylene inner sheath 9 are connected. A hot melt adhesive layer 8 is provided between the sheaths 9. By providing the hot melt adhesive layer 8 on the outside of the smooth aluminum sheath body 7, the cold resistance and flame resistance can be improved. The thickness of the hot melt adhesive layer 8 is 0.1mm. A nylon outer sheath body 11 is provided on the outside of the polyethylene inner sheath 9. The nylon outer sheath body 11 can improve the mechanical strength and surface hardness of the cable and reduce the probability of cable accidents caused by small animals gnawing on the cable. An adhesive 10 is filled between the polyethylene inner sheath 9 and the nylon outer sheath body 11. The thickness of the adhesive 10 is 0.1mm. The outside of the nylon outer sheath body 11 is coated with a graphite layer 12 for reducing cable loss and voltage. The graphite layer 12 can increase the conductivity of the cable, thereby reducing cable loss and voltage drop, improving power transmission efficiency, and effectively preventing contamination and oxidation on the cable surface, protecting the integrity and stability of the insulation layer, thereby extending the service life of the cable.

[0040] The graphite layer 12 has a fixing assembly 13 for fixing cables on its exterior. The fixing assembly 13 includes a base 131 for installation. A lower fixing seat 132 is fixedly mounted on the top of the base 131. An upper fixing seat 137 is movably mounted on the top of the lower fixing seat 132. The top of the lower fixing seat 132 has two slots 133. Two limiting grooves 134 and positioning grooves 135 are provided on the opposite sides of the two slots 133. Two insert plates 138 are fixedly mounted on the bottom of the upper fixing seat 137. Two limiting strips 1314 are fixedly mounted on one side of the insert plates 138. The limiting strips 1314 and the limiting grooves 134 are movably connected. A receiving hole 139 is provided on one side of the insert plate 138. A spring 1310 is fixedly mounted in the receiving hole 139. The spring 1310 and the positioning groove are connected. A guide plate 1311 is fixed between the columns 1312. Slider blocks 1313 are fixed on both sides of the guide plate 1311. Slide grooves are provided on both sides of the inner wall of the receiving hole 139. The sliders 1313 and slide grooves are movably connected. A positioning post 1312 is movably provided on one side of the insert plate 138. The positioning post 1312 and the positioning groove 135 are adapted to each other. Two baffles 136 are fixed on the outside of the lower fixed seat 132. The baffles 136 are arc-shaped to prevent rainwater from entering the positioning groove 135 and causing internal parts to rust and corrode. Buffer pads 1315 are fixed on the top of the lower fixed seat 132 and the bottom of the upper fixed seat 137. The buffer layer 1315 can not only enhance the friction between the cable and the cable, but also prevent the outer layer of the cable from being squeezed and damaged.

[0041] In this embodiment, the smooth aluminum sheath body 7 achieves uniform electric field distribution through its smooth surface, suppressing capacitive discharge and breaking the insulation degradation chain, fundamentally ensuring the long-term stable operation of the cable. This effectively avoids problems such as localized whitening, burning, and breakdown of the cable. Furthermore, the smooth aluminum sheath body 7 has a much smaller outer diameter than corrugated aluminum cables, reducing material costs and packaging and transportation expenses. In cable laying pipes with the same inner diameter, it can accommodate a larger diameter and a greater number of cables. The nylon outer sheath body 11 enhances the mechanical strength and surface hardness of the wire, reducing the risk of the cable being chewed by small animals. To reduce the probability of cable accidents, when fixing the cable, the base 131 is fixed to the surface of the support platform, the cable is placed on top of the lower fixing seat 132, and then the two positioning posts 1312 are pressed inward simultaneously, and the two insert plates 138 are inserted into the slot 133. When the positioning post 1312 moves to the position of the positioning groove 135, the spring 1310 causes the positioning post 1312 to reset and pop out from the positioning groove 135, thereby fixing the upper fixing seat 137. At this time, the upper fixing seat 137 and the lower fixing seat 132 are spliced ​​together, realizing the rapid fixing of the cable.

[0042] The above specific embodiments are merely several optional embodiments of this utility model. Based on the technical solution of this utility model and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A 500kV large-section smooth aluminum-sheathed nylon-outer-sheathed ultra-high voltage cable, comprising a conductor (1), characterized in that: The conductor (1) is wrapped with a semi-conductive nylon tape (2) for suppressing partial discharge. The semi-conductive nylon tape (2) is provided with an inner shielding layer (3) for suppressing partial discharge. The inner shielding layer (3) is provided with an insulating layer (4). The insulating layer (4) is provided with an outer shielding layer (5) for eliminating electric field distortion on the surface of the insulating layer (4). The outer shielding layer (5) is wrapped with a semi-conductive high-temperature resistant buffer water-blocking tape (6). The semi-conductive high-temperature resistant buffer water-blocking strip (6) is provided with a smooth aluminum sleeve body (7) for protection. The smooth aluminum sleeve body (7) is provided with a polyethylene inner sheath (9) and the polyethylene inner sheath (9) is provided with a nylon outer sheath body (11).

2. The 500kV large-section smooth aluminum-sheathed nylon-outer-sheathed ultra-high voltage cable according to claim 1, characterized in that, A hot melt adhesive layer (8) is provided between the smooth aluminum sleeve body (7) and the polyethylene inner sheath (9), and the thickness of the hot melt adhesive layer (8) is 0.1-0.2 mm.

3. A 500kV large-section smooth aluminum-sheathed nylon-outer-sheathed ultra-high voltage cable according to claim 1, characterized in that, An adhesive (10) with a thickness of 0.1 mm is filled between the polyethylene inner sheath (9) and the nylon outer sheath body (11).

4. A 500kV large-section smooth aluminum-sheathed nylon-outer-sheathed ultra-high voltage cable according to claim 1, characterized in that, The outer surface of the nylon outer sheath body (11) is coated with a graphite layer (12) for reducing cable loss and voltage, and the outer surface of the graphite layer (12) is provided with a fixing component (13) for fixing the cable.

5. A 500kV large-section smooth aluminum-sheathed nylon-outer-sheathed ultra-high voltage cable according to claim 4, characterized in that, The fixing component (13) includes a base (131) for installation. A lower fixing seat (132) is fixedly provided on the top of the base (131). An upper fixing seat (137) is movably provided on the top of the lower fixing seat (132). Two baffles (136) are fixedly provided on the outside of the lower fixing seat (132). A buffer pad (1315) is fixedly provided on the top of the lower fixing seat (132) and the bottom of the upper fixing seat (137).

6. A 500kV large-section smooth aluminum-sheathed nylon-outer-sheathed ultra-high voltage cable according to claim 5, characterized in that, The lower fixing seat (132) has two slots (133) on its top. Each of the two slots (133) has two limiting grooves (134) and a positioning groove (135) on the side away from each other. The upper fixing seat (137) has two insert plates (138) fixedly installed at its bottom. A positioning post (1312) is movably installed on one side of the insert plate (138). The positioning post (1312) and the positioning groove (135) are compatible.

7. A 500kV large-section smooth aluminum-sheathed nylon-outer-sheathed ultra-high voltage cable according to claim 6, characterized in that, Two limiting strips (1314) are fixedly provided on one side of the insert plate (138). The limiting strips (1314) and the limiting grooves (134) are movably connected. A storage hole (139) is provided on one side of the insert plate (138). A spring (1310) is fixedly provided in the storage hole (139). The same guide plate (1311) is fixed between the spring (1310) and the positioning post (1312). Slider blocks (1313) are fixedly provided on both sides of the guide plate (1311). Slider grooves are provided on both sides of the inner wall of the storage hole (139). The sliders (1313) and the slide grooves are movably connected.

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