High-voltage current-carrying tube and high-voltage bushing having the same

Abstract

The present invention provides a high-voltage current-carrying tube and a high-voltage bushing having the same. Among them, the high-voltage current-carrying tube includes a tube body; a first flow channel and a second flow channel, which are arranged in the tube body and are adapted to allow a cooling medium to flow, and both the first flow channel and the second flow channel extend along the radial direction of the tube body; a first communication cavity and a second communication cavity, which are arranged in the tube body, the first end of the first flow channel and the first end of the second flow channel are connected through the first communication cavity, and the second end of the first flow channel and the second end of the second flow channel are connected through the second communication cavity; a cooling structure, which is arranged on the tube body and is located at the first communication cavity; a one-way flow structure, which is arranged in the second flow channel. The technical solution of the present invention solves the defect that the heat generated by the current-carrying tube in the prior art is difficult to discharge after being energized.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage power transmission equipment, and particularly relates to a high-voltage current-carrying tube and a high-voltage bushing having the same. Background Art

[0002] With the continuous development of UHV power transmission technology in China, the demand for transmission capacity is increasing continuously, and the requirements for voltage and current levels of high-voltage power transmission equipment are constantly rising. The UHVDC transmission voltage has been increased from ±800 kV to ±1100 kV, and the transmission current has been increased from 5000 A to 6250 A. High-voltage equipment bears the combined effects of high voltage, large current and strong mechanical load during long-term operation, and there are high electrical, thermal and mechanical stresses inside. The electrical and thermal properties of high-voltage equipment affect each other, and the electrical insulation failure of equipment occurring in actual operation is directly related to its thermal performance. In order to transmit more power of electric energy, it is necessary to increase the transmission current and voltage, resulting in higher electrical stress and thermal loss during the operation of high-voltage electrical equipment, which severely restricts the application of electrical equipment in UHV projects. For example, the operating voltage level of ultra / extra-high voltage dry-type bushings is high, the electric energy transmission power is large, the current-carrying capacity of the current-carrying conductor in the center of the bushing is large and the heat generation is high, and the problem of heat uniformity inside the bushing is prominent. Practical operation experience shows that the insulation failure of most dry-type bushings is caused by the overheating inside the bushing, which leads to the thermal expansion of its insulating material.

[0003] To overcome this problem, currently two technical routes are usually adopted. One is to increase the volume and weight of electrical equipment. For example, for bushings, by making the conductive rod thicker to reduce the heat generation (the inner diameter of the core will also increase synchronously) and making the core thickness dimension larger to reduce the electrical stress, to ensure that the electrical stress and operating temperature of the insulating material of the bushing are within the safe operating range. The other is to adopt effective thermal management methods. For example, for converter valves, by equipping heat-generating elements with radiators, and continuously bringing the heat of the elements to the outside for dissipation by the deionized water circulating in the radiator, to ensure that the elements are maintained within the designed temperature range.

[0004] For high-voltage bushings, currently, increasing the volume and weight of components and using higher-quality imported raw materials are adopted to overcome the problems of large electrical stress and difficult temperature rise control of bushings under high voltage and large current. However, this leads to new problems such as too large size of epoxy insulation cores, excessive increase in the weight of bushings, high manufacturing cost, low yield rate, high operating temperature and low operating reliability of bushings, which greatly affects the popularization and application of UHV projects where the single-line transmission capacity accounts for nearly half of the electricity consumption in Beijing. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the heat generated after the current-carrying tube is energized in the prior art is difficult to discharge, so as to provide a high-voltage current-carrying tube and a high-voltage bushing having the same. By designing a new bushing structure, the electrical stress and thermal stress of the bushing are reduced, and the overall operating temperature of the bushing is reduced.

[0006] To solve the above problems, the present invention provides a high-voltage current-carrying tube, including: a tube body; a first flow channel and a second flow channel, which are arranged in the tube body and are adapted to allow a cooling medium to flow, and both the first flow channel and the second flow channel extend along the radial direction of the tube body; a first communication cavity and a second communication cavity, which are arranged in the tube body, the first end of the first flow channel and the first end of the second flow channel are communicated through the first communication cavity, and the second end of the first flow channel and the second end of the second flow channel are communicated through the second communication cavity; a cooling structure, which is arranged on the tube body and is located at the first communication cavity; a one-way flow structure, which is arranged in the second flow channel, and the one-way flow structure is configured to make the cooling medium flow unidirectionally from the first communication cavity to the second communication cavity.

[0007] Optionally, the tube body is a hollow structure, and the first flow channel and the second flow channel are arranged on the side wall of the tube body.

[0008] Optionally, there are a plurality of first flow channels, and the plurality of first flow channels are arranged at intervals along the circumferential direction of the tube body, and the second flow channel is arranged between two adjacent first flow channels.

[0009] Optionally, the tube body is a hollow structure, the first flow channel is arranged on the side wall of the tube body, and the hollow part of the tube body forms the second flow channel.

[0010] Optionally, there are a plurality of first flow channels, and the plurality of first flow channels are arranged at intervals along the circumferential direction of the tube body.

[0011] Optionally, the cooling structure includes a plurality of heat dissipation fins arranged at intervals.

[0012] Optionally, the high-voltage current-carrying tube further includes a grading ring sleeved outside the tube body, both ends of the heat dissipation fins are respectively connected to the outer side wall of the tube body and the inner side wall of the grading ring, and the plurality of heat dissipation fins are arranged radially.

[0013] Optionally, an exhaust valve communicated with the first communication cavity is arranged on the tube body.

[0014] The present invention also provides a high-voltage bushing, including the high-voltage current-carrying tube and an insulating sleeve sleeved outside the high-voltage current-carrying tube, and the high-voltage current-carrying tube is the above-mentioned high-voltage current-carrying tube.

[0015] Optionally, the high-voltage bushing is configured to pass through at least one grounding plane, and at least one end of the high-voltage bushing is connected to a converter valve.

[0016] Optionally, one end of the high-voltage bushing is connected to the converter valve, and the other end is connected to the transformer, so that the high-voltage bushing is suitable for transmitting high voltage and high current.

[0017] The present invention has the following advantages:

[0018] By using the technical solution of the present invention, when the high-voltage bushing is working, the tube body of the high-voltage current-carrying tube emits heat. Since the cooling medium in the first communication cavity of the tube body is cooled by the cooling structure, the temperature of the cooling medium in the second communication cavity is higher than that of the cooling medium in the first communication cavity. Due to the temperature difference, a pressure difference is generated in the cooling medium, and the cooling medium flows from the second communication cavity to the first communication cavity through the first flow pipe and is cooled in the second communication cavity. Since a one-way flow structure is provided in the second flow channel, the cooled cooling medium flows back to the second communication cavity from the first communication cavity through the second flow channel under the push of pressure and re-absorbs the heat emitted by the tube body. Thus, it can be seen that when the high-voltage bushing is working, the cooling medium in the first flow channel and the second flow channel forms a self-circulation under the action of the temperature difference, so as to continuously cool the tube body and ensure that the high-voltage bushing is always within a reasonable temperature range. Therefore, the technical solution of the present invention solves the defect that the heat emitted by the current-carrying tube in the prior art is difficult to discharge. Description of the Drawings

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 Fig. 1 shows a schematic structural diagram of Embodiment 1 of the high-voltage current-carrying tube of the present invention;

[0021] Figure 2 Fig. 2 shows Figure 1 a cross-sectional view of the high-voltage current-carrying tube in Fig. 1;

[0022] Figure 3 Fig. 3 shows Figure 1 a schematic diagram of the cooperation between the tube body and the grading ring of the high-voltage current-carrying tube in Fig. 1;

[0023] Figure 4 Fig. 4 shows Figure 1 a schematic structural diagram of the grading ring and the heat dissipation fins of the high-voltage current-carrying tube in Fig. 1; and

[0024] Figure 5 Fig. 5 shows a schematic structural diagram of Embodiment 2 of the high-voltage current-carrying tube of the present invention.

[0025] Description of the reference numerals:

[0026] 10, pipe body; 20, first flow channel; 30, second flow channel; 40, first communication cavity; 50, second communication cavity; 60, cooling structure; 61, heat dissipation fins; 70, one-way flow structure; 80, pressure equalizing ring; 90, exhaust valve. Detailed implementation manners

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0030] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] Embodiment 1

[0032] As Figure 1As shown in the figure, the high-voltage current-carrying tube of this embodiment includes a tube body 10, a first flow channel 20, a second flow channel 30, a first communication cavity 40, a second communication cavity 50, a cooling structure 60, and a one-way flow structure 70. Among them, the first flow channel 20 and the second flow channel 30 are arranged in the tube body 10 and are adapted to allow the cooling medium to flow, and both the first flow channel 20 and the second flow channel 30 extend along the radial direction of the tube body 10. The first communication cavity 40 and the second communication cavity 50 are arranged in the tube body 10. The first end of the first flow channel 20 and the first end of the second flow channel 30 are connected through the first communication cavity 40, and the second end of the first flow channel 20 and the second end of the second flow channel 30 are connected through the second communication cavity 50. The cooling structure 60 is arranged on the tube body 10 and is located at the first communication cavity 40. The one-way flow structure 70 is arranged in the second flow channel 30, and the one-way flow structure 70 is configured to allow the cooling medium to flow unidirectionally from the first communication cavity 40 to the second communication cavity 50.

[0033] Using the technical solution of this embodiment, when the high-voltage bushing works, the tube body 10 of the high-voltage current-carrying tube emits heat. Since the cooling medium in the tube body 10 located in the first communication cavity 40 is cooled by the cooling structure 60, the temperature of the cooling medium in the second communication cavity 50 is higher than the temperature of the cooling medium in the first communication cavity 40. The temperature difference causes a pressure difference in the cooling medium. The cooling medium flows from the second communication cavity 50 to the first communication cavity 40 through the first flow channel 20 and is cooled in the first communication cavity 40. Since the one-way flow structure 70 is arranged in the second flow channel 30, the cooled cooling medium flows back from the first communication cavity 40 to the second communication cavity 50 through the second flow channel 30 under the push of pressure and re-absorbs the heat emitted by the tube body 10. Thus, when the high-voltage bushing works, the cooling medium in the first flow channel 20 and the second flow channel 30 forms a self-circulation under the action of the temperature difference, so as to continuously cool the tube body 10 and ensure that the high-voltage bushing is always in a reasonable temperature range.

[0034] It should be noted that those skilled in the art can understand that the high-voltage bushing is actually inclined during operation. In this embodiment, when the high-voltage current-carrying tube is in operation, the tube body 10 is inclined, and the height of the first communication cavity 40 is higher than that of the second communication cavity 50. Therefore, after the cooling medium absorbs heat in the second communication cavity 50, its density decreases, and it will rise along the first flow channel 20 to the first communication cavity 40 (since a one-way flow structure 70 is provided in the second flow channel 30, the cooling medium cannot rise along the second flow channel 30). After the cooling medium is cooled by the cooling structure 60 in the first communication cavity 40, its density decreases, so it descends along the second flow channel 30. Thus, it can be seen that the cooling medium in this embodiment forms a self-circulation through the combined action of the pressure formed by the temperature difference and the change in liquid density.

[0035] It should be noted that in this embodiment, the cooling medium is water. Of course, other materials can be used as the cooling medium, and the cooling medium can be in a liquid state or a gaseous state. Further, for a liquid cooling medium, it is preferably a liquid with insulating properties, or it can be formulated according to the temperature difference to be controlled. At the same time, it is necessary to ensure that the equipment will not be damaged under low-temperature conditions.

[0036] As Figure 2 shown, in the technical solution of this embodiment, the tube body 10 is a hollow structure, and the first flow channel 20 and the second flow channel 30 are arranged on the side wall of the tube body 10. Specifically, the tube body 10 has a hollow tube structure, which includes a side wall with an annular cross-section. The above-mentioned first flow channel 20 and second flow channel 30 are arranged on the side wall of the tube body 10. On this basis, those skilled in the art can understand that the above-mentioned first communication cavity 40 and second communication cavity 50 are cavity structures arranged on the side wall of the tube body 10. The cavity extends along the annular direction of the side wall of the tube body 10, thereby connecting the ends of the first flow channel 20 and the second flow channel 30. From Figure 1 it can be seen that the first communication cavity 40 connects the left ends of the first flow channel 20 and the second flow channel 30, and the second communication cavity 50 connects the right ends of the first flow channel 20 and the second flow channel 30. Therefore, a circulation structure is formed among the first flow channel 20, the second flow channel 30, the first communication cavity 40, and the second communication cavity 50.

[0037] As Figure 2As shown, in the technical solution of this embodiment, there are multiple first flow channels 20, and the multiple first flow channels 20 are arranged at intervals along the circumferential direction of the pipe body 10. The second flow channel 30 is arranged between two adjacent first flow channels 20. Specifically, the multiple first flow channels 20 can cool the pipe body 10 comprehensively in the circumferential direction. At the same time, as described above, after the cooling medium is cooled in the first communication cavity 40, its density increases and it descends. In order to enable the cooling medium to flow into the second flow channel 30 more smoothly, the second flow channel 30 is located at a lower position, thereby strengthening the circulation effect of the cooling medium.

[0038] From Figure 2 It can be seen that the cross-sectional area of the second flow channel 30 is larger than that of the first flow channel 20. Among them, the cross-section of the second flow channel 30 should exceed the sum of the areas of all the first flow channels 20.

[0039] As Figure 1 shown, it should be further noted that from Figure 1 It can be seen that an annular groove is provided on the end face of the right end of the pipe body 10, and an annular cover-like structure is fixedly connected (such as welded), so that the second communication cavity 50 is formed between the annular groove and the annular cover-like structure. An end cover structure is provided at the left end of the pipe body 10, and the first communication cavity 40 is provided in the end cover structure, and the end cover structure and the left end of the pipe body 10 are fixedly connected (such as welded). Therefore, in fact, the above-mentioned end cover structure also forms a condenser for cooling the cooling medium. And preferably, the pipe body 10 is more suitable to be made of aluminum alloy material and is extruded in one piece according to the required length, including extruding all the channels. Since the pipe body 10, the annular cover-like structure and the end cover structure are fixedly connected together, the three are collectively referred to as the pipe body 10 in this embodiment. Therefore, those skilled in the art can understand that the pipe body 10 in this embodiment can refer to an integral structure formed after connecting other structures to both ends of a tubular structure.

[0040] As Figure 4As shown, in the technical solution of this embodiment, the cooling structure 60 includes a plurality of spaced heat dissipation fins 61. Specifically, the heat dissipation fins 61 can absorb the heat at the left end of the tube body 10, exchange heat with the external environment and dissipate the heat, so that the tube body 10 is always maintained within a reasonable temperature range. The heat dissipation fins 61 should be designed according to the requirements of the circulation speed to ensure that the temperature of the high-temperature liquid drops to an appropriate temperature within the required time. In fact, the temperature of the high-voltage bushing is not the lower the better. Taking summer as an example, even when the ambient temperature is 40°C, when the temperature approaches 70°C, this temperature difference can ensure the self-circulation of the liquid medium. Thus, the temperature of the tube body 10 can be controlled within a range slightly higher than 70°C, and this temperature is within a very ideal working range for the high-voltage current-carrying tube. Of course, the cooling structure 60 can also adopt other conventional heat dissipation structures.

[0041] As Figure 3 and Figure 4 shown, in the technical solution of this embodiment, the high-voltage current-carrying tube further includes a grading ring 80 sleeved outside the tube body 10. The two ends of the heat dissipation fins 61 are respectively connected to the outer side wall of the tube body 10 and the inner side wall of the grading ring 80, and the plurality of heat dissipation fins 61 are arranged radially. Since the exposed part of the high-voltage equipment requires a grading ring to uniform the electric field and prevent the generation of discharge and corona, and the cooling structure 60 is slightly complex, and the heat dissipation fins 61 have edges or sharp corners, it is necessary to install a grading ring. From Figure 3 and Figure 4 it can be seen that the heat dissipation fins 61 and the grading ring 80 can be made into one body. While achieving uniform electric field, the grading ring 80 is used for heat dissipation and the heat dissipation fins 61 are protected.

[0042] As Figure 1 shown, in the technical solution of this embodiment, an exhaust valve 90 communicating with the first communication cavity 40 is provided on the tube body 10. The function of the exhaust valve 90 is to prevent excessive gas from being generated in the above-mentioned channels and cavities, resulting in excessive pressure and causing destructive effects. In addition, an interface (not shown in the figure) for filling and discharging the cooling medium is also provided on the tube body 10.

[0043] Preferably, for the above-mentioned one-way flow structure 70, its specific structure can be a plunger structure with unequal areas at both ends, or a structure using a spring for one-way blocking, or a standard one-way valve product can also be selected.

[0044] Embodiment 2

[0045] As Figure 5As shown, the difference between the high-voltage current-carrying tube in the second embodiment and that in the first embodiment lies in that the tube body 10 is a hollow structure, the first flow channel 20 is arranged on the side wall of the tube body 10, and the hollow part of the tube body 10 forms the second flow channel 30. There are multiple first flow channels 20, and the multiple first flow channels 20 are arranged at intervals along the circumferential direction of the tube body 10. Specifically, in the second example, the middle channel of the tube body 10 is used as the second flow channel 30, that is, the second flow channel 30 is no longer arranged on the side wall of the tube body 10. At the same time, from Figure 5 It can also be seen that there are multiple first flow channels 20, and the multiple first flow channels 20 are arranged around the second flow channel 30.

[0046] Compared with the structure of the first embodiment, the structure of the second embodiment has a simpler manufacturing process, but the structure of the first embodiment has the advantage of a lighter overall structure.

[0047] This embodiment also provides a high-voltage bushing. The high-voltage bushing includes a high-voltage current-carrying tube and an insulating sleeve sleeved outside the high-voltage current-carrying tube, and epoxy resin is cast between the two. The high-voltage current-carrying tube is the above-mentioned high-voltage current-carrying tube.

[0048] Preferably, in order to ensure the insulation of the high-voltage bushing in this example, an insulating material is filled between the insulating sleeve and the high-voltage current-carrying tube, and the insulating material can be epoxy resin and so on.

[0049] In this embodiment, the high-voltage bushing is used to connect between a transformer and a converter valve and is used to transmit high voltage and high current. The high-voltage bushing passes through a wall, that is, through a grounding plane, so that the current-carrying tube with a higher potential can pass through the wall with a grounding potential. Further, the above-mentioned transformer is a converter transformer, and the high-voltage bushing connected between the converter transformer and the converter valve is also called the valve-side bushing of the converter transformer.

[0050] Further, in the prior art, there is also a usage mode in which both ends of the high-voltage bushing are connected to the converter valve. In this case, the high-voltage bushing is called a wall-through bushing. Those skilled in the art can understand that the wall-through bushing can also adopt the structure of the high-voltage current-carrying tube and the high-voltage bushing in the above-mentioned embodiment.

[0051] According to the above structure, the high-voltage current-carrying tubes in the above two embodiments have the following characteristics:

[0052] On the cross-section of the pipeline, a number of small holes (i.e., the first flow channel 20) are arranged as high-temperature liquid return holes, and a large hole (i.e., the second flow channel 30) is arranged as a low-temperature liquid inlet. A one-way valve is installed at the end of the low-temperature liquid inlet. When the temperature of the pipeline rises, the heated high-temperature liquid medium in the first flow channel 20 enters the first communication cavity 40 at the left end, and is cooled by the cooling structure 60. The cooled liquid medium settles at the bottom of the first communication cavity 40, enters the second flow channel 30 through the one-way valve, and after reaching the second communication cavity 50 at the right end, is heated and returns to the first communication cavity 40 through the first flow channel 20, and circulates in this way.

[0053] When the temperature difference between the pipeline and the environment is small, the circulation stops. When the temperature difference is too large, the circulation process is automatically started. The one-way valve ensures a pressure difference between the first communication cavity 40 at the left end and the second communication cavity 50 at the right end.

[0054] According to the above structure, the high-voltage current-carrying pipes in the above two embodiments have the following advantages:

[0055] 1. The structure is compact, making use of the internal space of the pipeline, and all channels are completed by one-time extrusion molding;

[0056] 2. The structure is simple, without the need for an additional pump to provide power and without the need to connect pipelines remotely;

[0057] 3. Safe and reliable, generating circulation by using temperature difference, which can ensure that the temperature rise of the current-carrying pipe is within a reasonable range.

[0058] 4. The selection range of the liquid medium used for cooling is relatively wide.

[0059] This embodiment provides a new type of high-voltage bushing technology containing a heat pipe component, which solves the problems of excessive electrical stress and thermal stress of high-voltage and large-current bushings, and can avoid the problems of too large epoxy insulation core size, excessive increase in bushing weight, high manufacturing cost, low yield rate, high operating temperature, and low operating reliability caused by the current technology, realizing the compact and lightweight design of high-voltage bushings, the domestic substitution of basic materials, the improvement of the yield rate, and the improvement of operating reliability; through this technology, the temperature distribution uniformity of the bushing core can also be improved and the operating temperature of the bushing can be greatly reduced, improving the voltage and current application levels of the bushing, meeting the requirements of subsequent extra-high voltage projects with larger capacity and higher voltage levels. The present invention is widely applicable to bushings in the high-voltage field, such as valve-side bushings of converter transformers, and is particularly suitable for bushings under large-current conditions. It lays a technical foundation for the construction and reliable operation of high-power extra-high voltage projects.

[0060] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. A high-voltage current-carrying tube, characterized in that, Comprising: A tube body (10); A first flow channel (20) and a second flow channel (30), which are arranged inside the tube body (10) and are adapted to allow a cooling medium to flow, and both the first flow channel (20) and the second flow channel (30) extend along the radial direction of the tube body (10); A first communication cavity (40) and a second communication cavity (50), which are arranged inside the tube body (10), a first end of the first flow channel (20) and a first end of the second flow channel (30) are communicated through the first communication cavity (40), and a second end of the first flow channel (20) and a second end of the second flow channel (30) are communicated through the second communication cavity (50); A cooling structure (60), which is arranged on the tube body (10) and is located at the first communication cavity (40); A one-way flow structure (70), which is arranged inside the second flow channel (30), and the one-way flow structure (70) is configured to allow the cooling medium to flow unidirectionally in the direction from the first communication cavity (40) to the second communication cavity (50), There are multiple first flow channels (20), and the cross-sectional area of the second flow channel (30) exceeds the sum of the areas of all the first flow channels (20).

2. The high-voltage current-carrying tube according to claim 1, wherein, The tube body (10) is a hollow structure, and the first flow channel (20) and the second flow channel (30) are arranged on the side wall of the tube body (10).

3. The high-voltage current-carrying tube according to claim 2, characterized in that, Multiple first flow channels (20) are arranged at intervals along the circumferential direction of the tube body (10), and the second flow channel (30) is arranged between two adjacent first flow channels (20).

4. The high-voltage current-carrying tube according to claim 1, characterized in that, The tube body (10) is a hollow structure, the first flow channel (20) is arranged on the side wall of the tube body (10), and the hollow part of the tube body (10) forms the second flow channel (30).

5. The high-voltage current-carrying tube according to claim 4, characterized in that, Multiple first flow channels (20) are arranged at intervals along the circumferential direction of the tube body (10).

6. The high-voltage current-carrying tube according to claim 1, characterized in that, The cooling structure (60) includes multiple heat dissipation fins (61) arranged at intervals.

7. The high-voltage current-carrying tube according to claim 6, characterized in that, The high-voltage current-carrying tube further includes a grading ring (80) sleeved outside the tube body (10), both ends of the heat dissipation fin (61) are respectively connected to the outer side wall of the tube body (10) and the inner side wall of the grading ring (80), and multiple heat dissipation fins (61) are arranged radially.

8. The high-voltage current-carrying tube according to claim 1, characterized in that, An exhaust valve (90) communicated with the first communication cavity (40) is arranged on the tube body (10).

9. A high-voltage bushing, characterized in that, Comprising a high-voltage current-carrying tube and an insulating sleeve sleeved outside the high-voltage current-carrying tube, and the high-voltage current-carrying tube is the high-voltage current-carrying tube according to any one of claims 1 to 8.

10. The high-voltage bushing according to claim 9, characterized in that, The high-voltage bushing is configured to pass through at least one grounding plane, and at least one end of the high-voltage bushing is connected to a converter valve.

11. The high-voltage bushing according to claim 10, characterized in that, One end of the high-voltage bushing is connected to the converter valve, and the other end is connected to a transformer, so that the high-voltage bushing is adapted to transmit high voltage and high current.

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