Modified polypropylene insulated ultrahigh-voltage power cable

Abstract

The utility model discloses a modified polypropylene insulation ultra-high voltage power cable, and relates to the technical field of electric power engineering. The MPP cable comprises an MPP insulating sleeve and a heat dissipation layer sleeved on the inner wall of the MPP insulating sleeve, a corrugated sheath is arranged on the inner wall of the heat dissipation layer, an elastic buffer layer is arranged on the inner wall of the corrugated sheath, and butt joint assemblies are respectively arranged at two ends of the outer wall of the MPP insulating sleeve. According to the utility model, the heat dissipation layer and the corrugated sheath can play a buffering and damping role on the internal wire core, simultaneously, the heat dissipation effect of the ultrahigh-voltage power cable is improved, the ultrahigh-voltage power cable is prevented from being affected and damaged by high temperature, multiple sections of ultrahigh-voltage power cables can be butted and fixed by using the butting assembly, rapid operation of constructors is facilitated, the use is convenient, and the working efficiency is improved. The working efficiency is high.

Description

Technical Field

[0001] This utility model belongs to the field of power engineering technology, and in particular relates to a modified polypropylene insulated ultra-high voltage power cable. Background Technology

[0002] Power cables are cables used to transmit and distribute electrical energy, and are widely used in urban underground power grids, power plant lead-out lines, internal power supply in industrial and mining enterprises, and underwater transmission lines across rivers and seas. In power systems, the proportion of cables is gradually increasing. As a core component of main lines, they can cover various voltage levels from 1-500KV and above, and use different insulation materials to meet diverse needs. To improve the insulation of power cables, modified polypropylene can now be used as the sheath for the internal conductors of power cables to increase their service life.

[0003] A search revealed that publication number CN218069442U, filed on August 11, 2022, discloses an ultra-high voltage power cable. This ultra-high voltage power cable includes a conductor core, an outer semi-conductive lightweight elastic buffer layer and a bundled copper wire current-conducting layer, and a welded and corrugated corrugated aluminum sheath wrapped around the bundled copper wire current-conducting layer. An outer sheath layer and an outer semi-conductive layer are extruded over the corrugated aluminum sheath layer. The semi-conductive lightweight elastic buffer layer is made of semi-conductive EPDM rubber. The bundled copper wire current-conducting layer is a structure formed by high-strength synthetic fiber braided fabric and bundled copper wires woven in a crisscross pattern. The bundled copper wires are stranded copper wires. Also, publication number CN221668569U, filed on November 27, 2023, discloses a long-length ultra-high voltage power cable, including a cable body, a sheath, a hinge, and a hanging ring. The cable contains copper conductors spaced evenly by metal separators. The outer layer of the copper conductors is wrapped with a semiconductor nylon tape, and the outer layer of the semiconductor nylon tape is covered with an ultra-smooth semi-conductive layer. The outer layer of the ultra-smooth semi-conductive layer is covered with an ultra-clean XLPE insulation layer. A first sheath is fitted over the outer layer of the ultra-clean XLPE insulation layer. A shielding layer is fitted over the outer layer of the first sheath, and an aramid paper layer is placed between the shielding layer and the first sheath. A second sheath is fitted over the outer layer of the shielding layer, and a heat-stabilized coating is applied between the second sheath and the shielding layer. This novel ultra-high voltage power cable improves the insulation performance of the cable after extension, ensures stable operation under high voltage, and is suitable for widespread use.

[0004] However, it still has the following drawbacks in practical use:

[0005] Existing modified polypropylene insulated ultra-high voltage power cables lack effective physical protection measures during use. When the power cable is subjected to external force, it is easy to cause damage to the internal core. At the same time, if the heat dissipation is insufficient, it may also cause thermal cycling damage or even thermal breakdown.

[0006] 2. Existing modified polypropylene insulated ultra-high voltage power cables cannot achieve multi-section cable splicing during use, making the operation cumbersome, time-consuming, and labor-intensive for construction personnel, resulting in low work efficiency. Therefore, we provide a modified polypropylene insulated ultra-high voltage power cable to solve the above-mentioned problems. Utility Model Content

[0007] The purpose of this utility model is to provide a modified polypropylene insulated ultra-high voltage power cable. By setting a heat dissipation layer and a corrugated sheath, it can buffer and dampen the internal core, improve the heat dissipation effect of the ultra-high voltage power cable, avoid damage caused by high temperature, and use a docking assembly to dock and fix multiple sections of ultra-high voltage power cable, which is convenient for construction personnel to operate quickly, is easy to use, and has high work efficiency.

[0008] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0009] This utility model is a modified polypropylene insulated ultra-high voltage power cable, including an MPP insulating sleeve and a heat dissipation layer sleeved on its inner wall. A corrugated sheath is provided on the inner wall of the heat dissipation layer, and an elastic buffer layer is provided on the inner wall of the corrugated sheath. A butt joint assembly is provided at both ends of the outer wall of the MPP insulating sleeve.

[0010] The docking assembly includes a conductor at the outer end of the MPP insulating sleeve and threaded sleeves at both ends of the outer wall of the conductor. Biting plates are evenly spaced on both sides of the conductor along the circumferential direction of the outer wall of the MPP insulating sleeve.

[0011] The present invention is further configured such that a heat-absorbing layer is provided on the inner wall of the elastic buffer layer, and heat-conducting columns are uniformly spaced between the heat-absorbing layer and the heat-dissipating layer.

[0012] The present invention is further configured such that springs are evenly spaced between the corrugated sheath and the elastic buffer layer, and a heat-stabilized coating is provided on the inner wall of the elastic buffer layer.

[0013] The present invention is further provided with a shielding layer on the inner wall of the heat-stabilized coating, and an aramid paper layer is sleeved on the inner wall of the shielding layer.

[0014] The present invention is further provided that an XLPE insulating layer is provided on the inner wall of the aramid paper layer, and a wire core is wrapped inside the XLPE insulating layer.

[0015] The present invention is further configured such that the outer wall of the bite plate is provided with external threads, and the front and rear ends of the inner wall of the bite plate are fixedly provided with fixing plates.

[0016] The present invention is further configured such that a rotating shaft is rotatably mounted inside the fixed plate, and a torsion spring is sleeved on the outer wall of the rotating shaft.

[0017] The present invention is further configured such that the bearings on the front and rear ends of the rotating shaft pass through the fixed plate and are connected to the bearings on the U-shaped plate, and one side wall of the U-shaped plate is fixed to the outer wall of the guide joint.

[0018] This utility model has the following beneficial effects:

[0019] This invention, by incorporating a heat dissipation layer and a corrugated sheath, utilizes the elasticity of the corrugated sheath, springs, and elastic buffer layer to buffer and dampen shocks, thereby reducing the force on the internal conductors and protecting them. Simultaneously, the heat absorbed by the heat-absorbing layer is transferred to the heat dissipation layer through the heat-conducting columns and dissipated, thus improving the heat dissipation effect of the ultra-high voltage power cable and preventing damage from high temperatures. This invention solves the problem that existing modified polypropylene insulated ultra-high voltage power cables lack effective physical protection measures during use, making them prone to damage to the internal conductors when subjected to external forces. Furthermore, insufficient heat dissipation may lead to thermal cycling damage or even thermal breakdown.

[0020] This invention, by setting up a docking assembly, uses a screw sleeve that spirally engages with the outer wall of multiple sets of bite plates, so that the four sets of bite plates are tightly clamped onto the outer wall of the ultra-high voltage power cable, playing a role in limiting and fixing. This allows multiple sections of ultra-high voltage power cable to be docked and fixed, facilitating quick operation by construction personnel, making it convenient to use and highly efficient. It solves the problem that existing modified polypropylene insulated ultra-high voltage power cables cannot achieve docking of multiple power cable sections, making the operation cumbersome, time-consuming, and labor-intensive for construction personnel, resulting in low work efficiency. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a modified polypropylene insulated ultra-high voltage power cable.

[0023] Figure 2 This is a cross-sectional view of a modified polypropylene insulated ultra-high voltage power cable.

[0024] Figure 3 This is a structural diagram of the docking components.

[0025] Figure 4 This is a structural diagram of the bite plate.

[0026] The attached diagram lists the components represented by each number as follows:

[0027] 100-MPP insulation sleeve, 101-heat dissipation layer, 101a-heat conducting column, 101b-heat absorbing layer, 102-corrugated sheath, 102a-spring, 102b-elastic buffer layer, 103-heat stabilizing coating, 104-shielding layer, 105-aramid paper layer, 106-XLPE insulation layer, 107-wire core, 200-button assembly, 201-conductor joint, 202-screw sleeve, 203-biting plate, 203a-fixing plate, 204-rotating shaft, 204a-torsion spring, 205-U-shaped plate. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model. Example 1

[0029] Please see Figures 1 to 2 This utility model is a modified polypropylene insulated ultra-high voltage power cable, including an MPP insulating sleeve 100 and a heat dissipation layer 101 sleeved on its inner wall. A corrugated sheath 102 is provided on the inner wall of the heat dissipation layer 101, and an elastic buffer layer 102b is provided on the inner wall of the corrugated sheath 102.

[0030] Specifically, a heat-absorbing layer 101b is provided on the inner wall of the elastic buffer layer 102b, and heat-conducting columns 101a are evenly spaced between the heat-absorbing layer 101b and the heat dissipation layer 101; springs 102a are evenly spaced between the corrugated sheath 102 and the elastic buffer layer 102b, and a heat-stabilizing coating 103 is provided on the inner wall of the elastic buffer layer 102b; a shielding layer 104 is provided on the inner wall of the heat-stabilizing coating 103, and an aramid paper layer 105 is sleeved on the inner wall of the shielding layer 104; an XLPE insulation layer 106 is provided on the inner wall of the aramid paper layer 105, and a wire core 107 is wrapped inside the XLPE insulation layer 106.

[0031] Furthermore, the heat dissipation layer 101 can improve the heat dissipation effect of the ultra-high voltage power cable, the heat absorption layer 101b can absorb the heat generated during the operation of the ultra-high voltage power cable, and the heat conduction column 101a can transfer the heat absorption layer 101b to the heat dissipation layer 101. The corrugated sheath 102, the elastic buffer layer 102b and the spring 102a can play a role in buffering and shock absorption. The heat-stabilized coating 103, the shielding layer 104, the aramid paper layer 105, the XLPE insulation layer 106, the wire core 107, the MPP insulation layer, etc. are all existing technologies, so they will not be described in detail here.

[0032] The operation process of this embodiment is as follows: When the ultra-high voltage power cable is subjected to tensile force, the outer MPP insulation sleeve 100 squeezes the corrugated sheath 102, spring 102a and elastic buffer layer 102b inward. The three absorb the impact energy through elastic deformation, thereby playing a buffering and shock-absorbing role, reducing the force on the internal core 107 and protecting it. When the ultra-high voltage power cable is in use, the high temperature generated will diffuse outward and be absorbed by the heat absorption layer 101b. Then, the heat is transferred to the heat dissipation layer 101 through the heat conduction column 101a. Finally, the heat is discharged through the heat dissipation layer 101 located on the outside, thereby improving the heat dissipation effect of the ultra-high voltage power cable and avoiding damage caused by high temperature. Example 2

[0033] Please see Figure 1 , Figure 3 and Figure 4 Based on Embodiment 1, unlike the first embodiment, a docking assembly 200 is provided. The docking assembly 200 includes a conductor 201 disposed at the outer end of the MPP insulating sleeve 100, and threaded sleeves 202 sleeved at both ends of the outer wall of the conductor 201. Biting plates 203 are evenly spaced on both sides of the conductor 201 along the circumferential direction of the outer wall of the MPP insulating sleeve 100. This solves the problem that existing modified polypropylene insulated ultra-high voltage power cables cannot achieve multi-segment power cable docking during use, which makes the operation cumbersome, time-consuming and labor-intensive for construction personnel, resulting in low work efficiency.

[0034] Specifically, the outer wall of the bite plate 203 is provided with external threads, and the front and rear ends of the inner wall of the bite plate 203 are fixedly provided with fixing plates 203a; a rotating shaft 204 is rotatably installed inside the fixing plate 203a, and a torsion spring 204a is sleeved on the outer wall of the rotating shaft 204; the front and rear ends of the rotating shaft 204 pass through the bearings on the fixing plate 203a and are connected to the bearings on the U-shaped plate 205, and one side wall of the U-shaped plate 205 is fixed on the outer wall of the guide joint 201.

[0035] Furthermore, the conductor 201 is placed between adjacent ultra-high voltage power cables. The thread on the inner wall of the screw sleeve 202 is screwed into the external thread on the outer wall of the bite plate 203. When the screw sleeve 202 rotates, its axial movement forces multiple sets of bite plates 203 to rotate around the rotating shaft 204, while compressing the torsion spring 204a, ultimately making the bite plate 203 tightly engaged on the outer wall of the cable.

[0036] The operation process of this embodiment is as follows: When multiple ultra-high voltage power cables need to be connected, the conductor 201 is placed between adjacent ultra-high voltage power cables, and then the screw sleeve 202 is rotated. The internal thread on the inner wall of the screw sleeve 202 is screwed into the external thread on the outer wall of the bite plate 203. Therefore, when the screw sleeve 202 rotates, it will move to the outside of the four bite plates 203 under the action of the thread. The cross-section of the four bite plates 203 is set in the shape of a frustum, and the diameter on the outer side is larger than the inner diameter. Therefore, as the screw sleeve 202 moves continuously, the outer ends of the four sets of bite plates 203 will be continuously squeezed inward and tightly clamped on the outer wall of the ultra-high voltage power cable, which plays a role in limiting and fixing. In this way, multiple ultra-high voltage power cables can be connected and fixed, which is convenient for construction personnel to operate quickly, is easy to use, and has high work efficiency.

[0037] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A modified polypropylene insulated ultra-high voltage power cable, comprising an MPP insulating sheath (100) and a heat dissipation layer (101) sleeved on its inner wall, wherein a corrugated sheath (102) is provided on the inner wall of the heat dissipation layer (101), and an elastic buffer layer (102b) is provided on the inner wall of the corrugated sheath (102), characterized in that: The outer walls of the MPP insulating sleeve are respectively provided with docking components (200) at both ends. The docking assembly (200) includes a guide joint (201) disposed at the outer end of the MPP insulating sleeve, and threaded sleeves (202) sleeved at both ends of the outer wall of the guide joint (201). Biting plates (203) are evenly spaced on both sides of the guide joint (201) along the circumferential direction of the outer wall of the MPP insulating sleeve.

2. The modified polypropylene insulated ultra-high voltage power cable according to claim 1, characterized in that, A heat-absorbing layer (101b) is provided on the inner wall of the elastic buffer layer (102b), and heat-conducting columns (101a) are uniformly spaced between the heat-absorbing layer (101b) and the heat-dissipating layer (101).

3. The modified polypropylene insulated ultra-high voltage power cable according to claim 2, characterized in that, Springs (102a) are evenly spaced between the corrugated sheath (102) and the elastic buffer layer (102b), and a heat-stabilized coating (103) is provided on the inner wall of the elastic buffer layer (102b).

4. The modified polypropylene insulated ultra-high voltage power cable according to claim 3, characterized in that, The inner wall of the heat-stabilized coating (103) is provided with a shielding layer (104), and the inner wall of the shielding layer (104) is covered with an aramid paper layer (105).

5. A modified polypropylene insulated ultra-high voltage power cable according to claim 4, characterized in that, An XLPE insulation layer (106) is provided on the inner wall of the aramid paper layer (105), and a wire core (107) is wrapped inside the XLPE insulation layer (106).

6. The modified polypropylene insulated ultra-high voltage power cable according to claim 1, characterized in that, The outer wall of the bite plate (203) is provided with external threads, and the front and rear ends of the inner wall of the bite plate (203) are fixed with fixing plates (203a).

7. A modified polypropylene insulated ultra-high voltage power cable according to claim 6, characterized in that, The fixed plate (203a) is rotatably mounted with a rotating shaft (204), and a torsion spring (204a) is sleeved on the outer wall of the rotating shaft (204).

8. A modified polypropylene insulated ultra-high voltage power cable according to claim 7, characterized in that, The front and rear ends of the rotating shaft (204) pass through the bearings on the fixed plate (203a) and are connected to the bearings on the U-shaped plate (205). One side wall of the U-shaped plate (205) is fixed on the outer wall of the guide joint (201).

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