CN216749436U - High-voltage current-carrying tube and high-voltage bushing with same - Google Patents

Abstract

The utility model 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; the heat conduction pipe is arranged on the outer side wall of the pipe body, the heat conduction pipe is of a structure with two closed ends, and a cooling medium is filled in the heat conduction pipe; and the heat dissipation structure is matched with one end of the heat conduction pipe. The technical scheme of the utility model 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 utility model 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

With the continuous development of the ultra-high voltage transmission technology in China, the demand of transmission capacity is continuously increased, the voltage and current grade requirement of high-voltage transmission equipment is continuously improved, the ultra-high voltage direct-current transmission voltage is improved to +/-1100 kV from +/-800 kV, and the transmission current is improved to 6250A from 5000A. High-voltage equipment bears the superposition of high voltage, large current and strong mechanical load in long-term operation, and has high electric, thermal and mechanical stress inside. The electrical and thermal properties of high-voltage equipment influence each other, and the electrical insulation failure of the equipment in actual operation is directly related to the thermal properties of the equipment. In order to transmit electric energy with higher power, the transmission current and voltage need to be increased, so that higher electric stress and heat loss are generated in the operation process of high-voltage electrical equipment, and the application of the electrical equipment in an extra-high voltage project is severely restricted. For example, the ultra/extra-high voltage dry-type sleeve has high operating voltage level, large electric energy transmission power, large current-carrying capacity and high heat generation of a current-carrying conductor in the center of the sleeve, and the problem of heat soaking inside the sleeve is prominent.

In order to overcome the problem, two technical routes are generally adopted at present, namely, the volume and the weight of electrical equipment are increased, for example, a sleeve is thickened, so that the heat productivity is reduced (the inner diameter of a core is synchronously increased), the thickness of the core is increased, so that the electric stress can be reduced, and the electric stress and the operating temperature of an insulating material of the sleeve are ensured to be in a safe operating range; secondly, an effective heat management mode is adopted, for example, a converter valve is adopted, a radiator is arranged on the heating element, and the heat of the element is continuously brought to the outdoor space by deionized water which flows in the radiator in a circulating mode to be radiated, so that the element is ensured to be maintained within a designed temperature range.

For a high-voltage bushing, the problems of large electric stress and difficult temperature rise control of the bushing under high voltage and large current are solved by increasing the volume and weight of components and adopting high-quality imported raw materials, but the novel problems of overlarge size of an epoxy insulated core, excessive increase of the weight of the bushing, high manufacturing cost, low yield, high operating temperature and low operating reliability of the bushing are caused, and the popularization and application of a single extra-high voltage project with the transmission capacity of nearly half of the power consumption of Beijing are greatly influenced.

SUMMERY OF THE UTILITY MODEL

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, thereby providing a high-voltage current-carrying tube and a high-voltage bushing with the same. The electric stress and the thermal stress of the sleeve are reduced by designing a new sleeve structure, and the overall operating temperature of the sleeve is reduced.

In order to solve the above problems, the present invention provides a high voltage current-carrying tube, comprising: a pipe body; the heat conduction pipe is arranged on the outer side wall of the pipe body, the heat conduction pipe is of a structure with two closed ends, and a cooling medium is filled in the heat conduction pipe; and the heat dissipation structure is matched with one end of the heat conduction pipe.

Optionally, the heat conducting pipe is a plurality of heat conducting pipes, and the plurality of heat conducting pipes are arranged at intervals along the circumferential direction of the pipe body.

Optionally, the heat pipe is embedded into an outer sidewall of the tube body.

Optionally, a mounting groove is provided on an outer surface of the pipe body, and the heat pipe is embedded into the mounting groove.

Optionally, the heat pipe is fixed in the mounting groove by welding.

Optionally, the heat dissipation structure comprises a plurality of heat dissipation fins arranged at intervals.

Optionally, the heat dissipating structure is disposed at an end of the tube.

The utility model 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 utility model has the following advantages:

by utilizing the technical scheme of the utility model, when the high-voltage bushing works, the tube body of the high-voltage current-carrying tube can emit heat. The heat that coolant in the heat-conducting pipe sent the high-tension current-carrying pipe absorbs, and heat radiation structure cools off the heat-conducting pipe simultaneously, and then discharges the heat to continuously cool off the body, guarantee that high-tension bushing is in reasonable within range at the during operation temperature. Therefore, the technical scheme of the utility model 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 an embodiment of a high voltage current carrying tube of the present invention;

FIG. 2 shows a schematic cross-sectional view of the high voltage current carrying tube of FIG. 1;

FIG. 3 shows a schematic partial cross-sectional view of the high voltage current carrying tube of FIG. 1 at the heat pipe; and

fig. 4 shows a schematic structural diagram of a heat dissipation structure of the high voltage current-carrying tube in fig. 1.

Description of reference numerals:

10. a pipe body; 11. mounting grooves; 20. a heat conducting pipe; 30. a heat dissipation structure; 31. and (4) radiating fins.

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 carrier in the present embodiment includes a pipe 10, a heat pipe 20, and a heat dissipation structure 30. Wherein, the pipe heat pipe 20 is disposed on the outer sidewall of the pipe body 10, and the heat pipe 20 is a structure with two closed ends. And the heat conductive pipes 20 are filled with the cooling medium. The heat dissipation structure 30 is fitted to one end of the heat conductive pipe 20.

With the technical solution of this embodiment, when the high voltage bushing works, the tube 10 of the high voltage current-carrying tube emits heat. The cooling medium in the heat pipe 20 absorbs the heat emitted from the tube 10, and the heat dissipation structure 30 cools the heat pipe 20 to discharge the heat, so as to continuously cool the tube 10, thereby ensuring that the temperature of the high-voltage bushing is within a reasonable range during operation. 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.

Further, the heat pipe 20 and the heat dissipation structure 30 in the present embodiment form a heat pipe heat dissipation structure. The heat pipe is a heat transfer element that transfers heat by means of phase change of working liquid inside the heat pipe, and the cooling medium filled in the heat pipe 20 in this embodiment is water. When the high voltage bushing is operated, the tube body 10 emits heat and heats the heat conductive pipe 20. The water in the heat conduction pipe 20 is evaporated by heat and takes away the heat. The heat dissipation structure 30 cools the heat pipe 20 and exchanges heat with the water vapor in the heat pipe 20, and the water vapor condenses and exchanges heat with the tube 10 again, so as to continuously cool the tube 10. Therefore, the heat conducting pipe 20 and the heat dissipation structure in the embodiment can continuously cool the pipe body 10 when the high-voltage bushing works, so that the high-voltage current-carrying pipe is kept within a reasonable temperature range.

Of course, the cooling medium described above is not limited to water, and for example, the cooling medium may be a refrigerant in an air conditioning system. Meanwhile, the cooling medium may be liquid or gas.

As shown in fig. 2, in the present embodiment, there are a plurality of heat transfer pipes 20, and the plurality of heat transfer pipes 20 are provided at intervals in the circumferential direction of the pipe body 10. Specifically, the pipe 10 has a cylindrical hollow pipe structure, and the heat transfer pipe 20 is provided in a plurality of circumferentially spaced positions along the center line of the pipe 10. The plurality of heat pipes 20 can dissipate heat of the pipe body 10 in the entire circumferential direction, thereby greatly improving the heat dissipation effect. Further, a plurality of heat conductive pipes 20 are arranged in parallel therebetween, each heat conductive pipe 20 extending in a radial direction of the pipe body 10. The intervals between the plurality of heat conductive pipes 20 are uniformly arranged.

As shown in fig. 2, in the present embodiment, the heat pipe 20 is embedded in the outer wall of the pipe body 10. Particularly, the heat transfer area between the heat pipe 20 and the pipe body 10 can be greatly increased by embedding the heat pipe 20 into the outer side wall of the pipe body 10, and then the heat transfer effect is improved. Of course, it is also possible to provide the heat conductive pipes 20 on the outer surface of the pipe body 10.

As shown in fig. 2, in the present embodiment, a mounting groove 11 is provided on an outer surface of the pipe body 10, and the heat pipe 20 is fitted into the mounting groove 11. Specifically, the mounting groove 11 is a groove structure extending in a radial direction of the pipe body 10, and the mounting groove 11 may be processed by a milling process. The above structure facilitates the installation of the heat conductive pipe 20 and the installation groove 11. Further preferably, in order to enhance the heat exchange effect between the heat conductive pipe 20 and the installation groove 11, the installation groove 11 in this example is a narrow-rebate groove type. Specifically, the width of the notch of the mounting groove 11 is slightly smaller than the diameter of the heat pipe 20, and the heat pipe 20 is pressed into the notch, so that a certain pressure is generated between the heat pipe 20 and the mounting groove 11, and the contact heat dissipation effect is improved. Of course, the heat conducting pipe 20 can be embedded into the outer surface of the pipe body 10 by other methods, such as integral casting.

As shown in fig. 3, in the solution of the present embodiment, the heat conductive pipe 20 is fixed in the installation groove 11 by welding. Specifically, the heat pipe 20 and the mounting groove 11 are connected by welding, so that the heat pipe 20 and the mounting groove 11 can be tightly connected, and the solder can also improve the heat transfer performance between the heat pipe 20 and the pipe body 10. In addition, the above welding process can further increase the contact area between the heat conducting pipe 20 and the pipe body 10 by using an intermittent weld or a long straight weld, and can also play a good role in fixing.

As shown in fig. 1, in the solution of the present embodiment, the heat dissipation structure 30 is disposed at an end of the pipe 10. Specifically, as described above, the heat conductive pipes 20 are provided in plurality at intervals in the circumferential direction, and the heat dissipation structure 30 is provided at the end of the pipe body 10 so that the ends of the plurality of heat conductive pipes 20 are easily engaged with the heat dissipation structure 30. As can be seen from fig. 1, most of the right end and the middle portion of the heat pipe 20 are embedded into the mounting groove 11, and the left end of the heat pipe 20 extends out of the tube body 10 and is matched with the heat dissipation structure 30, so that the tube body 10, the heat pipe 20 and the heat dissipation structure 30 are more compact. Of course, the heat dissipation structure 30 can be disposed at other positions of the tube 10, such as at the side of the tube 10.

As shown in fig. 4, in the solution of the present embodiment, the heat dissipation structure 30 includes a plurality of heat dissipation fins 31 arranged at intervals. Specifically, the end of the heat transfer pipe 20 is in contact with the heat radiation fin 31. The heat of the heat pipe 20 is transferred to the heat dissipation fins 31, and meanwhile, the heat dissipation fins 31 exchange heat with the external environment, thereby achieving the technical effect of heat dissipation. Of course, the heat dissipation structure 30 may also be other conventional heat dissipation devices, such as a heat dissipation fan, etc.

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.

In combination with the above, the high voltage current-carrying tube in this embodiment has the following advantages:

1. the structure is compact, and the heat pipe (namely the heat conducting pipe 20) is embedded in the groove on the outer cylindrical surface of the current-carrying pipe, so that the appearance is not influenced;

2. the heat pipe is simple and reliable, splicing or bending is not needed, the heat transfer effect can be better ensured by extruding and embedding the heat pipe into the groove or welding, and a water cooling pipeline and a water machine system are omitted;

3. the heat dissipation effect is controllable, and the heat dissipation effect can be ensured by increasing the area of the fins of the heat sink or forcibly cooling.

The embodiment provides a novel high-voltage bushing technology containing a heat pipe assembly, solves the problems of high electric stress and high thermal stress of a high-voltage and high-current bushing, can avoid the problems of overlarge size of an epoxy insulating core, excessive increase of weight of the bushing, high manufacturing cost, low yield, high operating temperature and low operating reliability caused by the prior art, and realizes compact and light-weight design of the high-voltage bushing, domestic replacement of base materials, improvement of the yield and improvement of the operating reliability; the technology can also improve the temperature distribution uniformity of the core body of the sleeve, greatly reduce the running temperature of the sleeve, improve the voltage and current application level of the sleeve and meet the requirements of follow-up ultrahigh voltage engineering with larger capacity and higher voltage level. The utility model is widely applicable to bushings in the high-voltage field, such as bushings on the side of a converter transformer valve, and is particularly suitable for bushings under the working condition of large current. And a technical foundation is laid for the construction and reliable operation of high-power extra-high voltage engineering.

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 derived therefrom are intended to be within the scope of the utility model.

Claims (10)

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

a tube (10);

the heat conduction pipe (20) is arranged on the outer side wall of the pipe body (10), the heat conduction pipe (20) is of a structure with two closed ends, and a cooling medium is filled in the heat conduction pipe (20);

a heat dissipation structure (30) engaged with one end of the heat pipe (20).

2. The high-voltage current-carrying pipe according to claim 1, wherein the heat conducting pipe (20) is plural, and the plural heat conducting pipes (20) are arranged at intervals in a circumferential direction of the pipe body (10).

3. The high voltage current carrying tube according to claim 1 or 2, characterized in that said heat conducting tube (20) is embedded into the outer side wall of said tube body (10).

4. The high-voltage current-carrying pipe according to claim 1 or 2, wherein an installation groove (11) is provided on an outer surface of the pipe body (10), and the heat pipe (20) is embedded in the installation groove (11).

5. The high voltage current-carrying tube according to claim 4, wherein the heat conducting tube (20) is fixed in the mounting groove (11) by welding.

6. The high voltage current-carrying tube according to claim 1, wherein the heat dissipation structure (30) comprises a plurality of spaced apart heat dissipation fins (31).

7. The high voltage current-carrying tube according to claim 1 or 6, wherein the heat dissipation structure (30) is provided at an end of the tube body.

8. 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 in any one of claims 1 to 7.

9. The high voltage bushing as claimed in claim 8, wherein the high voltage bushing is arranged to pass through at least one ground plane and wherein at least one end of the high voltage bushing is connected to a converter valve.

10. The high voltage bushing as claimed in claim 9, 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.

Images