Stress cone support and cable termination with heat dissipation window

Abstract

This application belongs to the field of cable fitting technology, specifically providing a stress cone support with a heat dissipation window and a cable terminal. By setting a heat dissipation window on the main body of the stress cone support, wherein at least one first heat dissipation window is located on the upper side of the main body, the speed of natural air convection between the inside and outside of the stress cone support is increased, significantly reducing heat accumulation on the inside of the stress cone support. At the same time, the metal sheath is restored, further improving the heat dissipation efficiency at the tail of the cable terminal, improving the insulation performance of the cable terminal, thereby ensuring the operational reliability and power transmission efficiency of the cable system.

Description

Technical Field

[0001] This application belongs to the field of cable fittings technology, and particularly to the field of cable termination technology, specifically relating to a stress cone support with a heat dissipation window and a cable termination. Background Technology

[0002] In high-voltage / ultra-high-voltage DC cable systems, cable terminals, as key components connecting the cable body to external equipment, directly impact the system's operational reliability and transmission efficiency through their overall heat dissipation performance. Since the conductors generate significant heat during operation, poor heat dissipation can lead to localized overheating, causing serious problems such as insulation aging and even breakdown. Currently, the bottleneck in terminal heat dissipation performance is primarily concentrated in the enclosed air cavity of the tail section. Due to the extremely low thermal conductivity of still air and the structural limitations on natural air convection in this area, heat easily accumulates, resulting in particularly pronounced localized overheating.

[0003] Existing high-voltage / ultra-high-voltage DC cable terminations primarily rely on passive cooling methods for heat dissipation at the tail section. This involves heat conduction through the edge metal sheath and natural convection of air within the enclosed cavity to dissipate heat to the external environment. This design suffers from the following problems: 1) The tail section design is flawed, particularly the presence of a cone-shaped support, which hinders natural air convection, leading to localized air heating and exacerbating heat accumulation; 2) During actual installation, the metal sheath within the tail section is often stripped away, significantly reducing the contact area with air and hindering efficient heat dissipation to the surrounding environment. Therefore, it is necessary to optimize the design of the cable termination's tail section to improve its heat dissipation efficiency and insulation performance. Summary of the Invention

[0004] In order to address the shortcomings of existing technologies, this application optimizes the tail structure of cable terminals by setting a heat dissipation window structure on the stress cone support and restoring the metal sheath of the cable, thereby improving the heat dissipation efficiency of the cable terminal.

[0005] First, this application provides a stress cone support with heat dissipation windows, including a top, a main body and a base. The main body connects the base and the top. The connection between the top and the main body is set as a first reference line. A first heat dissipation window is provided on the main body below the first reference line. The first heat dissipation windows are distributed at intervals along the circumference of the main body. The distance between the upper edge of the first heat dissipation window and the first reference line is 10mm-300mm.

[0006] In some embodiments, the height of the first heat dissipation window is 50mm-100mm, and the width of the first heat dissipation window corresponds to a central angle of 20°-35° in the circumferential direction.

[0007] In some embodiments, the first heat dissipation window has a gradually expanding shape with an upper edge dimension larger than the lower edge dimension, forming an outwardly expanding guide edge.

[0008] In some embodiments, the connection between the base and the main body is set as a second reference line, and a second heat dissipation window is provided on the main body above the second reference line. The second heat dissipation windows are distributed at intervals along the circumference of the main body, and the second heat dissipation windows do not overlap with the first heat dissipation window in the longitudinal direction.

[0009] In some embodiments, the number of second heat dissipation windows is less than the number of first heat dissipation windows, and the size of the second heat dissipation window is greater than the size of the first heat dissipation window.

[0010] In some embodiments, a heat dissipation fin extends from one side of the first heat dissipation window toward the outer surface of the main body. The heat dissipation fin is formed when the first heat dissipation window is open, and the number of heat dissipation fins is less than or equal to the number of the first heat dissipation windows.

[0011] In some embodiments, the outer surface of the stress cone is coated with an aluminum oxide coating.

[0012] Secondly, this application embodiment also provides a cable terminal, including a tail structure, the tail structure including a stress cone, and the stress cone is supported by the aforementioned stress cone support.

[0013] In some embodiments, a recoverable metal sheath is also included, the metal sheath being located between the stress cone support and the insulation layer of the copper conductor, the recovery height of the metal sheath being at least the same as the lower edge height of the first heat dissipation window.

[0014] In some embodiments, the outer wall of the metal sheath is also coated with silicone grease.

[0015] Compared with existing technologies, the beneficial effects achieved by this application are as follows: By setting a first heat dissipation window on the stress cone support, a chimney effect is formed, which accelerates the airflow velocity within the tail pipe structure, significantly enhances the air convection effect, greatly reduces heat accumulation on the inner side of the stress cone support, and improves heat dissipation efficiency. Furthermore, restoring the metal sheath of the cable increases the heat conduction path of air within the tail structure, improves the conductor heat dissipation efficiency, and enhances the insulation performance of the cable terminal, thereby ensuring the operational reliability and power transmission efficiency of the cable system.

[0016] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A partial cross-sectional schematic diagram of the stress cone support in this application is shown;

[0019] Figure 2 A schematic diagram of the overall structure of the stress cone support in this application is shown;

[0020] Figure 3 This invention illustrates a schematic cross-sectional view of the first heat dissipation window distribution of the stress cone support.

[0021] Figure 4 The simulation comparison diagram of airflow velocity at the tail structure of the cable terminal in this application is shown;

[0022] Figure 5 The simulation comparison diagram of temperature distribution at the tail structure of the cable terminal in this application is shown;

[0023] Figure 6 A schematic diagram of a stress cone support structure according to another embodiment of this application is shown;

[0024] Figure 7 A schematic diagram of a stress cone support structure according to another embodiment of this application is shown;

[0025] Figure 8 A schematic diagram of the cable termination structure in this application is shown;

[0026] Figure 9 A schematic diagram of the cable termination tail structure in this application is shown;

[0027] Figure 10 The diagram shows the highest tail air temperature distribution corresponding to the recovery length of the metal sheath in this application.

[0028] In the diagram: 1-Copper conductor, 2-XLPE insulation layer, 3-Silicone oil, 4-Porcelain bushing, 5-Epoxy resin sleeve, 6-Tail sleeve, 7-Cable body, 8-Stress cone, 9-Cone support, 91-First heat dissipation window, 92-Second heat dissipation window, 93-Heat dissipation fin, 94-Flow guide, 95-Top, 96-Main body, 97-Base, 10-Metal sheath, 11-Equalizing ring, 12-End cap, 13-Copper guide post, A-First reference line, B-Second reference line. Detailed Implementation

[0029] The term "comprising" in this application specification is synonymous with "including," "containing," or "characterized in," and is inclusive or open-ended, and does not exclude additional undescribed elements or method steps.

[0030] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0031] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] This embodiment provides a stress cone support 9 with a heat dissipation window for cable termination, specifically installed in the tail structure of the cable termination, such as... Figure 1-3 As shown, the stress cone support 9 is a hollow structure, allowing the cable to pass through it. The stress cone support 9 includes a top 95, a main body 96, and a base 97. The main body 96 connects the base 97 and the top 95. The top 95 is a funnel-shaped structure used to support and fix the stress cone 8. The main body 96 is a cylindrical structure. The base 97 has a cross-sectional diameter larger than that of the main body and extends outwards with a protrusion. The connection point between the top 95 and the main body 96 is designated as a first reference line A. A first heat dissipation window 91 is provided on the main body below the first reference line A, and the first heat dissipation windows 91 are spaced apart along the circumference of the main body.

[0035] Furthermore, the height of the first heat dissipation window 91 is 50mm-100mm, and the width of the first heat dissipation window 91 corresponds to a central angle of 20°-35° in the circumferential direction.

[0036] like Figure 4As shown, a simulation analysis of the airflow velocity at the tail of the cable terminal structure was performed. The comparison revealed that without the first heat dissipation window 91 provided to the stress cone support 9, as... Figure 4 As shown in (a), the air velocity inside the stress cone support 9 is basically uniform, while the air velocity outside the stress cone support 9 is 0.15 m / s; and when the first heat dissipation window 91 is opened on the stress cone support 9, as Figure 4 As shown in (b), the air inside the stress cone support 9 flows rapidly outward at the first heat dissipation window 91, with a maximum air velocity of 0.35 m / s. Clearly, by setting the first heat dissipation window 91 on the stress cone support 9, the convection of air inside and outside the stress cone support 9 is greatly increased, thereby significantly improving the heat dissipation effect of the air inside the stress cone support 9.

[0037] Furthermore, the distance between the upper edge of the first heat dissipation window 91 and the first reference line A is 10mm-300mm. For example... Figure 5 As shown, the air temperature distribution at the cable terminal tail is analyzed when the first heat dissipation window 91 is set in different positions. Figure 5 As shown in (a), when the upper edge of the first heat dissipation window 91 is 10 mm away from the first reference line A, only a small amount of hot air accumulates, and the highest temperature is 57.47℃; while when the upper edge of the first heat dissipation window 91 moves downward to a distance of 300 mm from the first reference line A, as shown in (a), Figure 5 As shown in (b), high-temperature air accumulates inside the stress cone support 9, with the highest temperature reaching 59.47°C.

[0038] The distance between the upper edge of the first heat dissipation window 91 and the first reference line A defines the space for hot air accumulation. As can be seen from the above comparative simulation experiments, the closer the distance between the upper edge of the first heat dissipation window 91 and the first reference line A, the more obvious the chimney effect and the better the convective heat dissipation effect. However, since the first reference line A is the inflection point connecting the top 95 and the main body 96, which is a stress concentration point, in order to meet the mechanical stress requirements of the stress cone support 9, the distance between the upper edge of the first heat dissipation window 91 and the first reference line A should be at least 10mm. Preferably, the distance between the upper edge of the first heat dissipation window 91 and the first reference line A is 10-100mm.

[0039] Furthermore, the number of first heat dissipation windows 91 is at least one. The more first heat dissipation windows 91 there are, the better the convection effect. However, the stress cone support 9 must also meet the requirements for the distribution of mechanical stress. Therefore, preferably, the number of first heat dissipation windows 91 is 4-8.

[0040] Furthermore, the first heat dissipation window 91 has a gradually expanding shape with the upper edge dimension larger than the lower edge dimension, forming an outwardly expanding guide edge. Under natural convection, compared with a right-angled rectangle, it reduces inlet vortices and avoids some airflow forming turbulence at the outlet. Furthermore, the connection points of each side of the first heat dissipation window 91 are set as rounded corners, thereby making the airflow transition more smoothly, reducing airflow resistance, and increasing flow velocity.

[0041] In some embodiments, the connection between the base 97 and the main body 96 is set as a second reference line B. A second heat dissipation window 92 is also provided on the main body near the second reference line B. The second heat dissipation windows 92 are spaced apart circumferentially along the main body, and the projections of the second heat dissipation windows 92 and the first heat dissipation windows 91 in the longitudinal direction do not coincide. Figure 6 As shown. Since the slit between the lower side of the stress cone support 9 and the conductor serves as an air inlet, its opening is small and the air intake is limited. By setting the second heat dissipation window 92, the air inlet on the lower side of the stress cone support 9 can be increased, the air intake flow can be increased, and the air flow efficiency can be improved.

[0042] Furthermore, the second heat dissipation window 92 is provided with a rounded edge, or the cross-section is formed into a continuous and smooth transition shape to avoid right-angle openings causing airflow separation and reducing airflow and velocity.

[0043] Furthermore, an outwardly protruding arc-shaped air guide shroud 94 is provided at the upper edge of the second heat dissipation window 92 to increase the airflow velocity of the second heat dissipation window 92.

[0044] Furthermore, the number of second heat dissipation windows 92 is less than the number of first heat dissipation windows 91, while the size of the second heat dissipation windows 92 is larger than the size of the first heat dissipation windows 91. Through this structural design, a smaller number of first heat dissipation windows 91 can increase the air velocity and flow rate at the air inlet, creating negative pressure near the air outlet. The smaller size and larger number of second heat dissipation windows 92 maximize the capture of negative pressure, accelerating air exhaust. Preferably, the ratio of the number of first heat dissipation windows 91 to the number of second heat dissipation windows 92 is at least 1.5:1.

[0045] Furthermore, a heat dissipation fin 93 extends from one side of the first heat dissipation window 91 toward the outer surface of the main body. The heat dissipation fin 93 is formed when the first heat dissipation window 91 opens, such as... Figure 7 As shown. Specifically, when the first heat dissipation window 91 is formed, the wall originally located in the first heat dissipation window 91 is cut into a certain shape, and one edge is retained to connect with the stress cone support 9. The cut wall is then folded at a certain angle towards the retained edge, and the folded wall forms a heat dissipation fin 93. The folded hole forms the first heat dissipation window 91. Furthermore, the heat dissipation fin 93 is set on the side of the first heat dissipation window 91, which can maximize the contact with hot air for heat dissipation, while minimizing air resistance.

[0046] Furthermore, the number of heat dissipation fins 93 is less than or equal to the number of first heat dissipation windows 91. When the number of first heat dissipation windows 91 is large, it is not necessary to form heat dissipation fins 93 on the side of each first heat dissipation window 91, thus avoiding an increase in airflow resistance due to an excessive number of heat dissipation fins 93.

[0047] In some embodiments, the outer surface of the stress cone support 9 is also coated with an aluminum oxide coating to increase the thermal radiation efficiency of the stress cone support 9 itself and further improve the heat dissipation effect.

[0048] Example 2

[0049] This second embodiment provides a cable terminal, such as... Figure 8-9 As shown, the cable includes a cable body 7, a tail structure, a porcelain bushing 4, an end cap 12, and an equalizing ring 11. The cable body 7 includes a copper conductor 1 and an XLPE insulation layer 2 disposed outside the copper conductor 1, which passes through the tail structure. A copper guide post 13 is disposed on the end cap 12, and the end of the copper conductor 1 is connected to the copper guide post 13, which is connected to the equalizing ring 11. The tail structure is partially disposed within the porcelain bushing 4, and silicone oil 3 is filled between the tail structure and the porcelain bushing 4.

[0050] The tail structure includes a stress cone 8, a tail sleeve 6 connected to the lower side of the stress cone 8, the stress cone 8 being at least partially located within the tail sleeve 6, the tail sleeve being filled with air, an epoxy resin sleeve 5 covering part of the stress cone 8 and the outer side of the tail sleeve 6, and also includes a stress cone support 9 as described in the above embodiment, the stress cone support 9 being located within the tail sleeve 6 for supporting the stress cone 8. The design of the stress cone support 9 in the above embodiment significantly improves the heat dissipation efficiency of the cable terminal tail structure.

[0051] Furthermore, the cable terminal also includes a restored metal sheath 10, which is restored into the tail sleeve 6 and located between the stress cone support 9 and the XLPE insulation layer 2 of the copper conductor 1.

[0052] To verify the impact of restoring the metal sheath 10 on the heat dissipation effect at the tail, a single-variable method was used to simulate and analyze the temperature distribution of cable terminals with restored metal sheaths 10 at different heights, assuming the stress cone support 9 is not open. Figure 10As shown, when the recovery length of the metal sheath 10 is 500 mm, the highest temperature of the tail structure drops from 65.7℃ to 64.22℃. With continued recovery of the metal sheath 10, extending the length to 1500 mm, the highest temperature of the tail structure drops to 59.42℃. It was found that the greater the recovery length of the metal sheath 10, the better the heat dissipation effect. Therefore, further, the recovery height of the metal sheath 10 should be at least consistent with the lower edge height of the first heat dissipation window 91, and can be restored up to the bottom of the stress cone 8.

[0053] Furthermore, the outer wall of the metal sheath 10 is coated with a silicone grease material containing elemental metals, such as silver and other conductive metals, which has excellent thermal conductivity and stability in use, does not corrode the metal materials it contacts, and increases its thermal conductivity without affecting the electrical conductivity of the metal sheath 10.

[0054] As can be seen from the above analysis, the stress cone support with heat dissipation window and the cable terminal using the stress cone support provided in this application greatly improve the heat dissipation effect of the cable terminal tail structure by setting heat dissipation window on the stress cone support and restoring the metal sheath, solving the problems of local overheating and low heat dissipation efficiency, and improving the system's operational reliability and power transmission efficiency.

[0055] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A stress cone holder with a heat dissipation window, comprising a top, a main body and a base, the main body connecting the base and the top, characterized in that, The main body is cylindrical and has a hollow structure, so that the cable passes through the main body, the connection between the top and the main body is set as a first reference line, the first heat dissipation window is arranged on the main body below the first reference line, the first heat dissipation window is distributed along the circumference of the main body, the spacing between the upper edge of the first heat dissipation window and the first reference line is 10mm-300mm, so that the stress cone holder meets the distribution requirements of mechanical stress and forms a chimney effect.

2. The stress cone of claim 1, wherein, The height of the first heat dissipation window is 50mm-100mm, and the width of the first heat dissipation window corresponds to a central angle of 20°-35° in the circumferential direction.

3. The stress cone of claim 1, wherein, The first heat dissipation window has a diverging shape with an upper edge size larger than a lower edge size, forming an outwardly expanding flow guide edge.

4. The stress cone of claim 1, wherein, The connection between the base and the main body is set as a second reference line, the second heat dissipation window is arranged on the main body above the second reference line, the second heat dissipation window is distributed along the circumference of the main body, and the second heat dissipation window does not coincide with the first heat dissipation window in the longitudinal direction.

5. The stress cone of claim 4, wherein, The number of second heat dissipation windows is less than the number of first heat dissipation windows, and the size of the second heat dissipation window is larger than the size of the first heat dissipation window.

6. The stress cone of claim 1, wherein, One side of the first heat dissipation window extends to the outer surface of the main body with a heat dissipation fin, the heat dissipation fin is formed when the first heat dissipation window is opened, and the number of heat dissipation fins is less than or equal to the number of first heat dissipation windows.

7. The stress cone of claim 1, wherein, The outer surface of the stress cone holder is coated with an aluminum oxide coating.

8. A cable termination comprising a tail structure, characterized by The tail structure includes a stress cone and uses the stress cone holder according to any one of claims 1-7 to support the stress cone.

9. The cable termination of claim 8, wherein, It also includes a restored metal sheath between the stress cone holder and the insulating layer of the copper conductor, and the restoration height of the metal sheath is at least consistent with the lower edge height of the first heat dissipation window.

10. The cable termination of claim 9, wherein, The outer wall of the metal sheath is also coated with a silicone grease material.

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