CN112700935A

CN112700935A - High-voltage current-carrying tube and high-voltage bushing with same

Info

Publication number: CN112700935A
Application number: CN202011564113.6A
Authority: CN
Inventors: 刘杉; 周建辉; 王航; 李云鹏; 卢理成; 刘泽洪; 侯俊义; 朱毅
Original assignee: State Grid Corp of China SGCC; Global Energy Interconnection Research Institute; Economic and Technological Research Institute of State Grid Shandong Electric Power Co Ltd
Current assignee: State Grid Corp of China SGCC; Global Energy Interconnection Research Institute; Economic and Technological Research Institute of State Grid Shandong Electric Power Co Ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-04-23

Abstract

The invention provides a high-voltage current-carrying tube and a high-voltage bushing with the same, wherein the high-voltage current-carrying tube comprises: a pipe body; and the cooling pipe is arranged on the outer surface of the pipe body, and a cooling medium inlet and a cooling medium outlet are formed at two ends of the cooling pipe. The technical scheme of the invention overcomes the defect that heat generated after the current-carrying pipe is electrified is difficult to discharge in the prior art.

Description

High-voltage current-carrying tube and high-voltage bushing with same

Technical Field

The invention relates to the technical field of high-voltage electricity transmission equipment, in particular to a high-voltage electricity carrying tube and a high-voltage bushing with the same.

Background

The high-voltage bushing is an important device commonly used in the high-voltage power industry, generally has a copper current-carrying tube to bear larger current, and meanwhile, in order to guarantee necessary ground clearance and creepage distance, the outside of the current-carrying tube is wrapped by an insulating sheath, and the whole length reaches several meters or even tens of meters.

Generally, a high voltage bushing is composed of an insulating sleeve with an external shed and an internal copper current-carrying tube, between which epoxy resin is poured, and the current-carrying tube is responsible for conducting current. When current flows through the current-carrying tube, the current-carrying tube inevitably generates heat, if the heat can not be effectively transferred out, the equipment is inevitably heated and heated continuously, and the sleeve or the related equipment is damaged in serious cases. However, since the current-carrying tube is poured inside the insulating sleeve, the heat dissipation condition is very poor, and in order to avoid the excessive temperature rise, the current-carrying tube is generally manufactured by using a copper tube with a larger diameter and a thicker copper tube in the prior art, so as to reduce the resistance of the conductor and reduce the heat generation. However, the arrangement of the current-carrying tube leads to the oversize of the device and the equipment, and increases the cost of the equipment.

Disclosure of Invention

Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that heat generated after a current-carrying tube is energized is difficult to be discharged, so as to provide a high voltage current-carrying tube and a high voltage bushing having the same.

In order to solve the above technical problem, the present invention provides a high voltage current-carrying tube, including: a pipe body; and the cooling pipe is arranged on the outer surface of the pipe body, and a cooling medium inlet and a cooling medium outlet are formed at two ends of the cooling pipe.

Optionally, the cooling tube is embedded into an outer surface of the tube body.

Optionally, the cooling tube comprises: the first pipe sections extend along the axial direction of the pipe body, and are arranged at intervals along the circumferential direction of the pipe body; a plurality of second tube segments, ends of adjacent first tube segments being connected by the second tube segments.

Optionally, the bending directions of the second pipe sections at the two ends of each first pipe section are opposite.

Optionally, be provided with a plurality of first mounting grooves on the surface of body, first mounting groove extends along the axial of body, and a plurality of first pipeline sections imbed to a plurality of first mounting grooves one-to-one.

Optionally, the outer surface of the pipe body is further provided with two second mounting grooves, the second mounting grooves extend along the circumferential direction of the pipe body, the two second mounting grooves are located on two sides of the first mounting groove respectively, two ends of the first mounting groove are communicated with the two second mounting grooves respectively, and the second pipe section is arranged in the second mounting groove.

Optionally, the second tube section is in a U-shaped configuration.

Optionally, a heat conducting structure is filled between the first pipe section and the first mounting groove.

Optionally, the cooling tube is made of a metal material.

The invention also provides a high-voltage bushing which comprises a high-voltage current-carrying tube and an insulating sleeve sleeved outside the high-voltage current-carrying tube, wherein the high-voltage current-carrying tube is the high-voltage current-carrying tube.

Optionally, the high voltage bushing is configured to pass through at least one ground plane and at least one end of the high voltage bushing is connected with the converter valve.

Optionally, the high voltage bushing is connected with the converter valve at one end and with a transformer at the other end, such that the high voltage bushing is adapted to transmit high voltage and high current.

The technical scheme of the invention has the following advantages:

by utilizing the technical scheme of the invention, the cooling pipe is arranged on the outer surface of the pipe body, when the high-voltage current-carrying pipe is electrified, the cooling medium is introduced into the cooling medium inlet, and the cooling medium exchanges and takes away heat emitted by the pipe body when flowing along the cooling pipe and is discharged from the cooling medium outlet. The cooling heat dissipation to high-voltage current-carrying pipe has been realized to above-mentioned structure, simultaneously, because the cooling tube sets up on the surface of current-carrying pipe, consequently can not cause the influence to the insulating sleeve in the high-voltage current-carrying pipe outside and filling resin, is convenient for control high-tension bushing's whole volume and weight, reduces high-tension bushing's manufacturing cost. Therefore, the technical scheme of the invention overcomes the defect that the heat generated after the current-carrying pipe is electrified is difficult to discharge in the prior art.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 shows a schematic structural view of a high voltage current-carrying tube of the present invention;

FIG. 2 shows a schematic sectional view along A-A in FIG. 1; and

fig. 3 shows a schematic cross-sectional view of the high voltage current-carrying tube of fig. 1 at the first mounting groove.

Description of reference numerals:

10. a pipe body; 11. a first mounting groove; 12. a second mounting groove; 20. a cooling tube; 21. a first tube section; 22. a second tube section; 30. a cooling medium inlet; 40. a cooling medium outlet; 50. a thermally conductive structure.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

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

As shown in fig. 1 and 2, the high-voltage current-carrying tube of the present embodiment includes a tube body 10 and a cooling tube 20. Wherein, the cooling pipe 20 is disposed on the outer surface of the pipe body 10, and both ends of the cooling pipe 20 form a cooling medium inlet 30 and a cooling medium outlet 40.

With the technical solution of this embodiment, the cooling pipe 20 is disposed on the outer surface of the pipe body 10, when the high-voltage current-carrying pipe is powered on, the cooling medium inlet 30 is introduced with the cooling medium, and when the cooling medium flows along the cooling pipe 20, the heat dissipated from the pipe body 10 is exchanged and taken away, and is discharged from the cooling medium outlet 40. Above-mentioned structure has realized the cooling heat dissipation to high-voltage electricity current-carrying pipe, simultaneously, because cooling tube 20 sets up on the surface of body 10, consequently can not cause the influence to the insulating sleeve in the high-voltage electricity current-carrying pipe outside and filling resin, is convenient for control high-voltage bushing's whole volume and weight, reduces high-voltage bushing's manufacturing cost. Therefore, the technical scheme of the embodiment overcomes the defect that heat emitted after the current-carrying pipe is electrified is difficult to discharge in the prior art.

As shown in fig. 1 and 2, in the present embodiment, the cooling pipe 20 is embedded in the outer surface of the pipe body 10. Specifically, a groove may be formed on the outer surface of the pipe body 10, and then the cooling pipe 20 may be inserted into the groove, so that the cooling pipe 20 may be embedded into the outer surface of the pipe body 10. On one hand, the structure makes the structure between the tube body 10 and the cooling tube 20 compact, and the volume occupied by the tube body 10 is not increased. On the other hand, the contact area between the cooling tube 20 and the tube body 10 is increased, so that the heat exchange effect of the cooling tube 20 is better. Of course, in some embodiments, not shown, the cooling tube 20 may be directly disposed on the outer surface of the tube body 10 instead of being embedded in the outer surface of the tube body 10. For example, the cooling pipe 20 may be welded directly to the outer surface of the pipe body 10, which is also a possible embodiment.

Further, as mentioned in the background art, the effect of reducing heat generation is achieved by increasing the diameter of the pipe body 10 in the prior art, but such an arrangement would increase the overall diameter of the high-voltage bushing due to the increase of the diameter of the pipe body 10, and increase the weight, which not only increases the manufacturing cost, but also greatly increases the static and dynamic loads borne by the equipment, and particularly affects the shock resistance. In this embodiment, the cooling pipe 20 is embedded into the outer surface of the pipe body 10, and the heat of the pipe body 10 is taken away by the circulating liquid in the cooling pipe 20, so as to ensure that the temperature rise of the pipe body 10 is within a reasonable range. Meanwhile, through the embedded arrangement, the insulating sleeve device, the pouring resin and the like cannot be influenced. From this, can realize making the sleeve pipe with less current-carrying pipe (body 10), make high-voltage bushing's volume and weight reduce, reduce cost by a wide margin, improve high-voltage bushing's bearing capacity and shock resistance.

It should be noted that the cooling medium in this embodiment may be a liquid, a gas, or other phase change material. Further, the cooling medium may be generally selected from liquids such as water, alcohols, oils, and fluorides, among which water is a preferred embodiment.

As shown in fig. 1, in the solution of the present embodiment, the cooling pipe 20 includes a plurality of first pipe segments 21 and a plurality of second pipe segments 22. The first pipe segments 21 extend in the axial direction of the pipe body 10, and a plurality of the first pipe segments 21 are arranged at intervals in the circumferential direction of the pipe body 10, and the ends of the adjacent first pipe segments 21 are connected by the second pipe segments 22. Specifically, the above structure allows the cooling pipe 20 to form a coiled structure, thereby greatly increasing the heat exchange area between the cooling pipe 20 and the pipe body 10. Preferably, both ends of the first pipe section 21 extend to substantially both ends of the pipe body 10, so that the entire structure of the pipe body 10 in the axial direction can be effectively radiated. The plurality of first pipe segments 21 are arranged at intervals along the circumferential direction, so that the pipe body 10 can be effectively radiated at various positions along the circumferential direction. The end parts of the adjacent first pipe sections 21 are connected through the second pipe section 22, so that the length of a flow passage of the cooling medium is increased, and the cooling effect is improved.

Of course, the cooling pipe 20 is not limited to the above arrangement, and in some embodiments, not shown, the cooling pipe 20 may be arranged on the pipe body 10 in a spiral winding manner, or the cooling pipe 20 may be arranged on the pipe body 10 in an irregular manner.

As shown in fig. 1, in the solution of the present embodiment, the bending directions of the second tube segments 22 at the two ends of each first tube segment 21 are opposite. Specifically, the above-described structure allows the first pipe segments 21 to be connected end to form a one-way fluid passage without branches. Further, the above-described structure is such that the second tube segments 22 are disposed at intervals in the same side between the plurality of first tube segments 21; the second tube sections 22 are offset on both sides of the first tube sections 21. Of course, in some embodiments, not shown, for a plurality of first pipe segments 21, each adjacent first pipe segment 21 may be connected together by a second pipe segment 22, but this may increase the complexity of the pipeline.

Further, the cooling pipe 20 in this embodiment is one, and thus has one cooling medium inlet 30 and one cooling medium outlet 40. Of course, the number of the cooling pipes 20 may be increased according to the actual heat dissipation requirement, and the number of the cooling medium inlets 30 and the cooling medium outlets 40 may be increased adaptively.

As shown in fig. 1, in the technical solution of the present embodiment, a plurality of first installation grooves 11 are provided on an outer surface of the pipe body 10, the first installation grooves 11 extend in an axial direction of the pipe body 10, and a plurality of first pipe segments 21 are embedded into the plurality of first installation grooves 11 in a one-to-one correspondence manner. Specifically, as described above, by fitting the first pipe 21 into the first mounting groove 11, the structure between the pipe body 10 and the cooling pipe 20 is made compact, and the heat radiation effect of the cooling pipe 20 can be increased. Further, in the present embodiment, the number of the first pipe segments 21 is the same as that of the first installation grooves 11, so that the plurality of first pipe segments 21 are embedded into the plurality of first installation grooves 11 in a one-to-one correspondence manner.

As shown in fig. 2, in the technical solution of this embodiment, two second mounting grooves 12 are further disposed on the outer surface of the pipe body 10, the second mounting grooves 12 extend along the circumferential direction of the pipe body 10, the two second mounting grooves 12 are located at two sides of the first mounting groove 11, two ends of the first mounting groove 11 are respectively communicated with the two second mounting grooves 12, and the second pipe segment 22 is disposed in the second mounting groove 12. Specifically, the second installation groove 12 facilitates the arrangement of the above-described second pipe section 22, the second installation groove 12 is annular, and both sides of the first installation groove 11 are provided with the second installation groove 12, and the end of the first installation groove 11 communicates with the second installation groove 12. Since the second pipe section 22 has a bent structure, the second installation groove 12 is formed in an annular shape, and the plurality of second pipe sections 22 are located in the second installation groove 12. Meanwhile, as can be seen from fig. 1, the first mounting groove 11 and the second mounting groove are respectively of a groove structure extending in the transverse direction and the circumferential direction, namely, the machining can be realized through turning and milling processes, and the process steps are simple. Of course, in some embodiments, not shown, the second mounting groove 12 may also be shaped to fit the second pipe section 22, but this may increase the difficulty of machining.

As shown in fig. 1, in the solution of the present embodiment, the second pipe section 22 is U-shaped. The above-mentioned structural arrangement can make the cooling medium flow smoothly. Of course, the second tube section 22 may have other configurations, such as a V-shape or other irregular shape.

As shown in fig. 3, in the solution of the present embodiment, a heat conducting structure 50 is filled between the first pipe segment 21 and the first installation groove 11. Specifically, in the present embodiment, the heat conducting structure 50 is a brazing filler metal laid between the first pipe segment 21 and the first installation groove 11, and the heat conducting area between the first pipe segment 21 and the first installation groove can be increased by welding, and at the same time, the first pipe segment 21 can be well fixed.

Further, in addition to the above-described manner of welding the first pipe section 21 in the first installation groove 11, the first installation groove 11 may be made smaller, and the first pipe section 21 may be further pressed in the first installation groove 11. After the cooling medium is introduced into the cooling pipe 20, the hydraulic pressure causes a certain deformation of the first pipe section 21, so that the first pipe section 21 and the first installation groove 11 are in tight contact.

Preferably, the cooling tube 20 is made of metal in this embodiment. Further preferably, the cooling tube 20 is made of the same copper material as the tube body 10, which not only has a good heat transfer effect, but also has the advantages of the same linear expansion coefficient, easy pressing, easy welding and the like. Of course, other materials having a good heat conduction effect may be selected as the material for the cooling pipe 20.

This embodiment still provides a high-voltage bushing, and high-voltage bushing includes high-voltage current-carrying pipe and overlaps the insulating cover of establishing outside the high-voltage current-carrying pipe, has pour epoxy between the two, and high-voltage current-carrying pipe is foretell high-voltage current-carrying pipe.

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 may be epoxy resin or the like.

In this embodiment, the high voltage bushing is used for connection between the transformer and the converter valve and for transmitting high voltage and high current. The high voltage bushing passes through a wall, i.e. a ground plane, thereby enabling current-carrying tubes with a higher potential to pass through the wall at ground potential. Further, the transformer is a converter transformer, and the high-voltage bushing connected between the converter transformer and the converter valve is also referred to as a converter transformer valve-side bushing.

Further, in the prior art, there is a usage mode of connecting both ends of the high voltage bushing to the converter valve, in this mode, the high voltage bushing is referred to as a wall bushing, and it can be understood by those skilled in the art that the wall bushing may also adopt the structure of the high voltage current-carrying tube and the high voltage bushing in the above embodiments.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. A high voltage current-carrying tube, comprising:

a tube (10);

and the cooling pipe (20) is arranged on the outer surface of the pipe body (10), and a cooling medium inlet (30) and a cooling medium outlet (40) are formed at two ends of the cooling pipe (20).

2. High voltage current-carrying tube according to claim 1, characterized in that the cooling tube (20) is embedded within the outer surface of the tube body (10).

3. The high voltage current-carrying tube according to claim 1 or 2, wherein the cooling tube (20) comprises:

a plurality of first pipe segments (21), wherein the first pipe segments (21) extend along the axial direction of the pipe body (10), and the first pipe segments (21) are arranged at intervals along the circumferential direction of the pipe body (10);

a plurality of second pipe sections (22), ends of adjacent first pipe sections (21) being connected by the second pipe sections (22).

4. The high-voltage current-carrying tube according to claim 3, wherein the bending directions of the second tube segments (22) at both ends of each first tube segment (21) are opposite.

5. The high-voltage current-carrying pipe according to claim 3, wherein a plurality of first installation grooves (11) are provided on an outer surface of the pipe body (10), the first installation grooves (11) extend in an axial direction of the pipe body (10), and a plurality of first pipe sections (21) are embedded in the plurality of first installation grooves (11) in a one-to-one correspondence.

6. The high-voltage current-carrying pipe according to claim 5, wherein two second mounting grooves (12) are further disposed on the outer surface of the pipe body (10), the second mounting grooves (12) extend along the circumferential direction of the pipe body (10), the two second mounting grooves (12) are respectively disposed at two sides of the first mounting groove (11), two ends of the first mounting groove (11) are respectively communicated with the two second mounting grooves (12), and the second pipe section (22) is disposed in the second mounting groove (12).

7. The high voltage current-carrying tube according to claim 3, wherein the second tube segment (22) is of a U-shaped configuration.

8. The high-voltage current-carrying pipe according to claim 5, wherein a heat conducting structure (50) is filled between the first pipe section (21) and the first mounting groove (11).

9. High voltage current-carrying tube according to claim 1, characterized in that said cooling tube (20) is made of metal material.

10. A high voltage bushing, comprising a high voltage current-carrying tube and an insulating sleeve sleeved outside the high voltage current-carrying tube, wherein the high voltage current-carrying tube is the high voltage current-carrying tube according to any one of claims 1 to 9.

11. The high voltage bushing as claimed in claim 10, wherein said high voltage bushing is arranged to pass through at least one ground plane and wherein at least one end of said high voltage bushing is connected to a converter valve.

12. The high voltage bushing as claimed in claim 11, wherein one end of the high voltage bushing is connected to the converter valve and the other end is connected to a transformer, such that the high voltage bushing is adapted to transmit high voltage and high current.