Gas-insulated enclosed switchgear

Abstract

The utility model relates to the technical field of bus assemblies, and specifically relates to a gas insulated enclosed switchgear. Comprising a gas tank, a primary main loop is installed in the gas tank, a through-flow conductor of the primary main loop is connected with a heat dissipation structure, the heat dissipation structure comprises an insulation heat transfer part and a heat dissipation part, an avoiding opening is formed in the wall face of the gas tank, the heat dissipation structure penetrates through the avoiding opening and is in sealing fit with the avoiding opening, and the heat dissipation part is integrally located on the outer side of the gas tank; in the working process, radiation heat dissipation is carried out in the air box and is matched with the heat dissipation component outside the air box, an inside and outside combined heat dissipation system is formed, particularly, the heat dissipation component is in direct contact with air outside the air box, heat can be rapidly dissipated to the external environment, heat in the air box of equipment can be rapidly transferred to the outside of the air box, the problem of temperature rise in the air box is solved, and the service life of the air box is prolonged. Therefore, the equipment temperature is effectively reduced, and the operation efficiency and stability of the equipment are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of busbar assemblies, and particularly relates to a gas-insulated switchgear. Background Art

[0002] Gas-insulated switchgear Metal-enclosed switchgear is widely used in the construction of power system distribution and high-speed rail substations in the medium-voltage field due to its advantages such as small volume and compact size. However, the primary conductive main circuit of the gas-insulated switchgear metal-enclosed switchgear is sealed in a closed gas tank, and its heat cannot be well exchanged with the outside air. The main heat dissipation methods of the main circuit are conduction and radiation, and the heat dissipation efficiency is low. Moreover, due to the small internal space and the need to consider insulation between components, the thermal conductivity of traditional epoxy resin cast insulators is only 0.2, and the conduction ability is poor, which affects the heat dissipation efficiency of the main circuit through heat conduction. When the current rises to 2500A and higher, the heat generated by the conductive circuit causes the temperature in the gas tank to rise sharply, easily resulting in excessive temperature rise.

[0003] The prior art, such as the invention patent application with the publication number CN110444353A, discloses a switchgear and its supporting insulator. The supporting insulator includes a supporting heat-conducting part extending in the up-down direction and an outer insulating part arranged circumferentially outside the supporting heat-conducting part. The supporting heat-conducting part includes metal supporting members located at both ends in the up-down direction and a ceramic heat-transfer structure that is in top-pressure contact with the metal supporting members at both ends and insulates and separates the metal supporting members at both ends. The metal supporting members and the ceramic heat-transfer structure have relatively high thermal conductivities, which is beneficial to improving the heat conduction efficiency and reducing the temperature rise at the disconnector part and the static and dynamic ends of the arc extinguishing chamber. However, on the basis that the heat generated by the main circuit causes the temperature in the gas tank to rise sharply, resulting in a relatively high temperature of the tank wall, the heat is directly transferred to the tank wall through the supporting insulator, further increasing the temperature of the tank wall. At this time, both the tank wall and the temperature of the gas tank inside the tank wall are relatively high, and the cooling speed of the gas tank is relatively slow, making it difficult to solve the problem of excessive temperature rise.

[0004] The prior art, such as the invention patent with the authorization announcement number CN110767482B, discloses a gas-insulated metal-enclosed switch, including a sealed housing. An insulating base is fixedly arranged in the sealed housing, and a static contact connected to the busbar is fixedly arranged on the insulating base. A heat pipe and a heat dissipation member are also arranged in the sealed housing. One end of the heat pipe is connected to the insulating base, and the other end is connected to the heat dissipation member. A part of the heat dissipation member extends out of the sealed housing and is in sealing cooperation with the sealed housing at the extending position. Only a part of the heat dissipation member is exposed outside the sealed housing. A part of the heat in the sealed housing is absorbed by the heat pipe from the insulating base and transferred to the heat dissipation member, and the heat dissipation member dissipates the heat to the outside of the sealed housing. However, the heat dissipation member will also directly transfer the heat to the tank wall, causing the temperature of the tank wall to rise, resulting in a slow cooling speed inside the sealed housing.

[0005] Therefore, none of the above-mentioned prior arts has truly solved the problem that when a large current passes through, the conductive loop generates heat, causing the temperature inside the gas tank to rise sharply, resulting in the problem of exceeding the temperature rise standard. Rapid cooling of gas-insulated switchgear remains an urgent problem to be solved in the industry. Summary of the Invention

[0006] The purpose of the present utility model is to provide a gas-insulated switchgear to solve the problems in the prior art that when the main circuit generates heat and causes the temperature inside the gas tank to rise sharply, the cooling speed inside the gas tank is slow, the heat dissipation effect is poor, and the overall reliability and safety of the equipment are affected.

[0007] To achieve the above purpose, the technical solution of the gas-insulated switchgear provided by the present utility model is: it includes a gas tank, a primary main circuit is installed inside the gas tank, a heat dissipation structure is connected to the current-carrying conductor of the primary main circuit, the heat dissipation structure includes an insulating heat transfer component and a heat dissipation component, an avoidance opening is provided on the gas tank wall surface, the heat dissipation structure passes through the avoidance opening and is in sealing cooperation with the avoidance opening, and the heat dissipation component is entirely located outside the gas tank.

[0008] As a further improvement, the avoidance opening is opened on the top wall of the gas tank, and the heat dissipation component is entirely located outside the top of the gas tank.

[0009] As a further improvement, the current-carrying conductor is an integrally formed angular busbar, and a heat dissipation auxiliary structure is provided on the angular busbar.

[0010] As a further improvement, a wiring component is provided on the top wall of the gas tank, the angular busbar includes an inclined section extending obliquely downward from the wiring component and a vertical section extending upward from the lower end of the inclined section, and the end of the vertical section constitutes the connection end for connecting the insulating heat transfer component, and the two ends of the inclined section are respectively the connection ends for connecting the wiring component and the conductive component.

[0011] As a further improvement, the heat dissipation auxiliary structure is a plurality of heat dissipation slits arranged along the thickness direction of the angular busbar on the angular busbar, and the heat dissipation slits penetrate and extend to the end surface of the inclined section of the angular busbar facing away from the conductive component, the lower side surface of the inclined section, and the surface of the angular busbar between the connection end of the insulating heat transfer component and the connection end of the wiring component.

[0012] As a further improvement, heat dissipation teeth are arranged opposite to the surface of the heat dissipation slits.

[0013] As a further improvement, the surface of the current-carrying conductor is coated with nano heat dissipation coating.

[0014] As a further improvement, the heat dissipation component is a radiator.

[0015] As a further improvement, the radiator is a finned radiator.

[0016] As a further improvement, the insulating heat transfer component includes a porcelain insulator, and copper inserts are provided at both ends of the porcelain insulator to be connected to the heat dissipation component and the current-carrying conductor respectively.

[0017] The beneficial effect is as follows: the utility model provides a gas-insulated enclosed switchgear that is improved on the basis of the prior art. During operation, part of the heat generated by the main circuit will be transferred to the wall of the air chamber through radiation heat dissipation to cool down, which helps to reduce heat accumulation. On this basis, a large amount of heat generated when a large current passes through will be directly transferred to the heat dissipation component outside the air box by heat conduction from the insulating heat transfer component. The heat dissipation component is in direct contact with the air outside the air box, and can quickly dissipate the heat to the external environment, so that the heat inside the air chamber of the equipment is quickly transferred to the outside of the air chamber. In this way, the heat dissipation component outside the air box becomes the lowest temperature part in the entire heat dissipation structure, and the heat on the current-carrying conductor can flow mainly to the heat dissipation component through the insulating heat transfer component, and will not accumulate in large quantities in the air box and on the box wall, solving the problem of temperature rise in the air chamber, thereby effectively reducing the temperature of the equipment and ensuring its stable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of an embodiment of a gas-insulated enclosed switchgear provided by the utility model;

[0019] Figure 2 A three-dimensional structural diagram of an embodiment of a gas-insulated enclosed switchgear provided by the utility model;

[0020] Figure 3 A front view of an embodiment of a gas-insulated enclosed switchgear provided by the utility model;

[0021] Figure 4 for Figure 3 H-direction view;

[0022] Figure 5 for Figure 3 C-direction view;

[0023] Figure 6 for Figure 3 E-direction view;

[0024] Figure 7 for Figure 6 An enlarged schematic diagram of point F;

[0025] In the figure: 1. Air box; 2. Finned radiator; 3. Busbar socket; 4. Support sleeve; 5. Angular busbar; 6. Porcelain insulator; 7. Copper insert; 8. Heat dissipation teeth; 9. Copper tube structure. DETAILED DESCRIPTION

[0026] The features and performance of the present utility model will be further described in detail below in conjunction with embodiments.

[0027] In a gas-insulated switchgear, since the primary conductive main circuit is sealed in a closed gas tank, the air flow hardly moves, the heat dissipation is poor, and due to the small internal space, insulation is also required between components. Generally, insulators made of epoxy resin casting are used to ensure the insulation performance, but their thermal conductivity is low, which affects the efficiency of heat dissipation of the main circuit through heat conduction. In the prior art cited in the background art, either on the basis that the main circuit generates heat and causes the temperature in the gas tank to rise sharply, the heat is directly transferred to the tank wall through the support insulator, resulting in a relatively high temperature of the tank wall, and the temperatures of the tank wall and the gas tank inside the tank wall are relatively high. At this time, the cooling speed of the gas tank is relatively slow; or only part of the heat dissipation component is exposed outside the sealed housing, and the heat will be directly transferred to the tank wall by the heat dissipation component, causing the heat of the tank wall to increase and the cooling speed inside the tank to be slow.

[0028] Therefore, how to efficiently transfer the heat generated by the main circuit inside the gas tank of the gas-insulated switchgear to the air outside the gas tank is one of the problems in the technical field of metal-enclosed switchgear. In this regard, the present utility model provides a gas-insulated switchgear that improves the prior art to solve the problems existing in the above-mentioned prior art.

[0029] The overall design concept of the gas-insulated switchgear provided by the present utility model is as follows:

[0030] An primary main circuit is installed in the gas tank of the gas-insulated switchgear of the present utility model. A heat dissipation structure is connected to the current-carrying conductor of the primary main circuit. The heat dissipation structure includes an insulating heat transfer component and a heat dissipation component. An avoidance opening is provided on the gas tank. The heat dissipation structure passes through the avoidance opening and is in sealing cooperation with the avoidance opening, so that the heat dissipation component is located outside the gas tank. During the working process, a large amount of heat generated will be directly transferred by the insulating heat transfer component to the heat dissipation component outside the gas tank through heat conduction. The heat dissipation component is directly in contact with the air outside the gas chamber and can quickly dissipate the heat to the external environment, thereby effectively reducing the temperature of the equipment and ensuring its stable operation.

[0031] Moreover, the heat dissipation component is arranged outside the gas chamber, which is beneficial to maintenance. During the working process, radiation heat dissipation in the gas chamber and the heat dissipation structure outside the gas chamber cooperate with each other to form an internal and external combined heat dissipation system, making full use of the advantages of various heat dissipation mechanisms, realizing efficient heat transfer and dissipation. This comprehensive heat dissipation method ensures that the main circuit can maintain a relatively low working temperature even during high-load operation, thereby improving the operation efficiency and stability of the equipment.

[0032] Based on the above overall introduction of the gas-insulated switchgear of the present utility model, a more specific embodiment is provided below on the basis of the overall introduction:

[0033] As Figures 1 - 7 shown, the avoidance opening is provided on the top wall of the air box 1, and the heat dissipation component is entirely located outside the top of the air box 1. This is because most of the heat generated during the working process will naturally dissipate towards the top of the air box 1. The heat is transferred upward to the heat dissipation component that is entirely located outside the top of the air box 1, and the heat is carried away by the external air of the air box 1, resulting in faster cooling. And a small part of the heat generated by the primary circuit is dissipated into the air box 1. Due to the natural upward movement of hot air, this part of the heat will also converge to the top position of the air box 1. Similarly, under the action of the heat dissipation component, heat dissipation can be carried out relatively quickly. In this way, it is possible to avoid a large amount of heat diffusion towards the lower side of the air box 1 where the current-carrying conductor is located. Overall, the temperature rise inside the air box can be effectively controlled, the advantages of various heat dissipation mechanisms can be fully utilized, and even if a small amount of heat is transferred to the wall of the air box 1, it can be quickly dissipated, thereby effectively reducing the equipment temperature and ensuring its stable operation.

[0034] A wiring component is also provided on the top wall of the air box 1. The current-carrying conductor is a special-shaped busbar for realizing the conduction of the working circuit. The main body of the special-shaped busbar is irregular and has a plurality of protruding ends to form connection ends respectively for connecting the heat dissipation structure and other parts inside the air box, thereby forming a working circuit and dissipating heat through the heat dissipation structure. For the convenience of connection, the current-carrying conductor can be a rectangular busbar. The rectangular busbar has a transverse extension length and a longitudinal extension length, so that one end of the rectangular busbar can be connected to the heat dissipation structure on the top wall of the air box, and the other ends of the rectangular busbar can be used to connect to other parts to form a working circuit.

[0035] More preferably, in this embodiment, the special-shaped busbar is an integrally formed angular busbar 5. Compared with the rectangular busbar, the angular busbar 5 helps to optimize the current distribution. Due to the skin effect of the current, the angular busbar 5 can make better use of the surface of the conductor for current conduction, thereby reducing the resistance. In addition, the angular busbar 5 can make more effective use of the material. With the same amount of material used, the angular busbar 5 can provide a larger conductive area, thereby reducing the resistance, which is beneficial to equipment cooling and prolonging the service life.

[0036] The end of the vertical section of the angular busbar 5 is connected to the insulating and heat-transferring component on the top wall of the gas tank 1. Both ends of the inclined section of the angular busbar 5 are used for conductive connection with other parts to form a working circuit. The two ends of the inclined section can be respectively conductively connected to other parts through the busbar socket 3 or the support sleeve 4. Specifically, in this embodiment, the extending direction of the wiring component at the upper end of the inclined section is the same as that of the insulating and heat-transferring component. The wiring component is the busbar socket 3 cast with epoxy resin and can be hermetically connected to the top wall of the gas tank 1 through a sealing ring or a sealing strip. Due to the epoxy resin casting, the heat dissipation capacity of the wiring component itself is poor. Since in this embodiment, both the busbar socket 3 and the insulating and heat-transferring component connected with the heat dissipation component extend towards the top of the gas tank 1, it is beneficial to the heat dissipation of the busbar socket 3. The surface of the angular busbar 5 between the wiring component and the insulating and heat-transferring component is an arc surface recessed in the direction opposite to the extending direction of the insulating and heat-transferring component. The space beside the wiring component is large, which further improves the heat dissipation efficiency of the wiring component. The three side surfaces of the angular busbar 5 can all be used as heat dissipation surfaces for heat dissipation, and it is easier for the angular busbar 5 to be connected to other parts at its three corners respectively.

[0037] The angular busbar 5 is also provided with a heat dissipation auxiliary structure. The heat dissipation auxiliary structure is a heat dissipation gap opened on the angular busbar 5 for increasing the heat dissipation area. A plurality of heat dissipation gaps are opened along the thickness direction of the angular busbar. The plurality of heat dissipation gaps can increase the heat dissipation area of the angular busbar to facilitate heat dissipation, so that heat can be transferred out of the angular busbar faster. And the heat dissipation gaps are beneficial to guiding heat to the top of the gas tank 1, and further accelerating the heat dissipation speed under the action of the heat dissipation component, so as to keep the gas-insulated switchgear operating within a safe temperature range.

[0038] Since the end of the angular busbar 5 is used as a connection end, the heat dissipation gaps should be opened avoiding the connection end of the angular busbar. Specifically, the heat dissipation gaps penetrate and extend to one end face of the inclined section of the angular busbar 5 facing away from the conductive component, the lower side surface of the inclined section, and the surface of the angular busbar between the connection end of the insulating and heat-transferring component and the connection end of the wiring component to maximize the heat dissipation area. That is, the heat dissipation gaps extend transversely between the wiring component and the insulating and heat-transferring component, and longitudinally between the wiring component and the conductive component, so as not to affect the connection between the angular busbar and the insulating and heat-transferring component, the wiring component and the conductive component while increasing the heat dissipation area.

[0039] As Figure 7 shown, in order to further increase the temperature reduction effect of the equipment during operation, heat dissipation teeth 8 are arranged opposite to the surface of the heat dissipation gaps on the angular busbar 5. Compared with the heat dissipation gaps with a flat surface, it provides a larger surface area to contact the surrounding air, so as to more effectively dissipate the heat of the angular busbar 5 from the heat dissipation gaps.

[0040] To further improve the heat dissipation performance of the current-carrying conductor, a nano heat dissipation coating is applied on the surface of the current-carrying conductor. The nano heat dissipation coating can significantly improve the thermal radiation performance of the surface of the current-carrying conductor. The special nano materials in the coating can stimulate the resonance effect on the surface of the current-carrying conductor, and the radiation coefficient of the surface of the current-carrying conductor is increased, enabling it to more effectively dissipate heat in the form of thermal rays to the surrounding environment with a lower temperature. The nano heat dissipation coating can specifically be a carbon nano coating with an extremely high thermal conductivity, which can effectively improve the heat dissipation efficiency and remain stable in a high-temperature environment. Of course, in other embodiments, it can also be a metal oxide nano coating.

[0041] For the angular busbar 5 to be conductively connected to other parts to form a working circuit, as described above, both ends of the inclined section of the angular busbar 5 can be conductively connected to other parts through the busbar socket 3 or the support sleeve 4 respectively. In this embodiment, as Figures 1 - 6 shown, the support sleeve 4 is located inside the gas tank 1 and has a copper tube structure 9. The outside of the support sleeve 4 is epoxy resin cast to ensure insulation. Its two ends are brazed with copper blocks and can be conductively connected to other parts inside the gas tank 1. Compared with the traditional solid copper conductor, the copper tube structure 9 requires less material, significantly reducing the overall weight. This not only reduces the raw material cost but also simplifies the installation and transportation processes. On the basis of achieving lightweight, it can still maintain a good current-carrying effect and ensure the smooth flow of current in the gas-insulated switchgear.

[0042] In other embodiments, the busbar socket 3 or the support sleeve 4 can also be a metal support sleeve 4 wrapped with insulating material. The metal support sleeve 4 can specifically be a copper tube or an aluminum tube, retaining the conductivity of the metal sleeve for more reliable conductive connection to other parts, and the external insulating material ensures the insulation performance and improves the safety of the equipment.

[0043] On the basis of the above overall description of the gas-insulated switchgear of the present utility model, the following provides a more specific embodiment:

[0044] This embodiment focuses on a detailed description of the insulation heat transfer component.

[0045] As Figures 1 - 6As shown, the main body of the insulating heat transfer component is the porcelain insulator 6. The porcelain insulator 6 has good insulation performance, which can effectively prevent current leakage or short circuit, thereby improving safety. On the basis of ensuring the stable transmission of the loop current, the fault risk is reduced. More preferably, the porcelain insulator 6 is an alumina ceramic insulator. Due to its high resistivity and excellent electrical insulation performance, the alumina ceramic insulator can be safely used in a high-voltage environment, effectively preventing the occurrence of current leakage or short circuit accidents; and because the thermal conductivity of alumina ceramic is at least about 20 W / (m•K), it has relatively good thermal conductivity among ceramic materials and can more effectively conduct the heat generated inside to the surface and then dissipate it through convection and radiation.

[0046] Both ends of the porcelain insulator 6 are provided with copper inserts 7. The copper inserts 7 are welded to the porcelain insulator 6 as a whole to be connected to the heat dissipation component and the current-carrying conductor respectively. The thermal conductivity of copper can reach about 400 W / (m•K). Due to its excellent thermal conductivity, when a large amount of heat is generated during the operation of the gas-insulated switchgear, the copper inserts 7 can quickly conduct the heat of the current-carrying conductor to the heat dissipation component, thereby keeping the working temperature of the gas-insulated switchgear within a safe range and helping to improve the stability and reliability of the entire system. In other embodiments, to improve the heat transfer rate of the porcelain insulator 6, brass inserts can be provided at both ends of the porcelain insulator 6. The cost of the brass inserts is relatively low, thereby reducing the manufacturing cost of the entire gas-insulated switchgear.

[0047] On the basis of the above overall description of the gas-insulated switchgear of the present invention, the following provides a more specific embodiment:

[0048] This embodiment focuses on a detailed description of the heat dissipation component.

[0049] The heat dissipation component is a radiator hermetically connected to the wall surface of the gas tank, such as Figures 1 - 6 As shown, in this embodiment, the radiator is a finned radiator 2. The fins increase the heat dissipation area and improve the heat exchange efficiency, enabling the heat dissipation component to quickly transfer the heat in a short time and achieve a good heat dissipation effect. Or the radiator can also be a water-cooled radiator. More preferably, the finned radiator 2 is an aluminum finned radiator. The aluminum finned radiator is screwed to the gas tank 1 and can be conveniently disassembled and replaced when needed. At the same time, due to the relatively high thermal conductivity of aluminum, it can effectively conduct and dissipate the heat generated by the main circuit, keeping the equipment within the normal working temperature range; and the aluminum radiator is relatively light, which is beneficial to controlling the weight of the gas-insulated switchgear. Or in other embodiments, the radiator can also be a plate-shaped radiator, which can also be an aluminum plate-shaped radiator or a copper plate-shaped radiator.

[0050] To ensure the sealing performance of the air box 1, when the heat dissipation component is installed on the top wall of the air box 1 through a seal, specifically, a sealing strip can be used to fill the gap between the heat dissipation component and the air box 1 to prevent gas leakage. In other embodiments, the heat dissipation component can also be hermetically connected to the air box 1 through an O-ring.

[0051] It should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present utility model will not describe various possible combination methods separately.

[0052] In addition, any combination can be made among various different embodiments of the present utility model, as long as it does not violate the idea of the present utility model, and it should also be regarded as the content disclosed by the present utility model.

[0053] The above is only the preferred embodiment of the present utility model, and it is not intended to limit the present utility model. The patent protection scope of the present utility model is subject to the claims. Any equivalent structural changes made by using the description and drawings of the present utility model should be included in the protection scope of the present utility model by the same token.

Claims

1. A gas-insulated enclosed switchgear, characterized in that: It includes an air box, in which a primary main circuit is installed. A heat dissipation structure is connected to the current-carrying conductor of the primary main circuit. The heat dissipation structure includes an insulating heat transfer component and a heat dissipation component. A avoidance port is provided on the wall of the air box. The heat dissipation structure passes through the avoidance port and is sealed with the avoidance port. The heat dissipation component is located on the outside of the air box as a whole.

2. The gas-insulated enclosed switchgear according to claim 1, characterized in that: The avoidance opening is arranged on the top wall of the air box, and the heat dissipation component is located on the top outer side of the air box as a whole.

3. The gas-insulated enclosed switchgear according to claim 2, characterized in that: The current-carrying conductor is an integrally formed angular busbar, on which a heat dissipation auxiliary structure is provided.

4. The gas-insulated enclosed switchgear according to claim 3, characterized in that: A wiring component is provided on the top wall of the air box, and the angular busbar includes an inclined section extending obliquely downward from the wiring component and a vertical section extending upward from the lower end of the inclined section. The end of the vertical section constitutes a connecting end connected to the insulating heat transfer component, and the two ends of the inclined section are connecting ends connected to the wiring component and the conductive component respectively.

5. The gas-insulated enclosed switchgear according to claim 4, characterized in that: The heat dissipation auxiliary structure is a plurality of heat dissipation gaps arranged on the angular busbar along the thickness direction of the angular busbar. The heat dissipation gaps extend through and extend to the end face of the inclined section of the angular busbar that faces away from the conductive component, the lower side face of the inclined section, and the surface of the angular busbar between the connecting end of the insulating heat transfer component and the connecting end of the wiring component.

6. The gas-insulated enclosed switchgear according to claim 5, characterized in that: Heat dissipation teeth are arranged opposite to each other on the surfaces of the heat dissipation gap.

7. The gas-insulated enclosed switchgear according to any one of claims 1 to 6, characterized in that: The surface of the current-carrying conductor is coated with nano heat dissipation paint.

8. The gas-insulated enclosed switchgear according to any one of claims 1 to 6, characterized in that: The heat dissipation component is a radiator.

9. The gas-insulated enclosed switchgear according to claim 8, characterized in that: The radiator is a fin type radiator.

10. The gas-insulated enclosed switchgear according to any one of claims 1 to 6, characterized in that: The insulating heat transfer component comprises a porcelain insulator, and red copper inserts are arranged at both ends of the porcelain insulator to be respectively connected with the heat dissipation component and the current-carrying conductor.

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