Conductive rod and high-voltage bushing

Abstract

The present invention discloses a conductive rod and high-voltage bushing, relating to the field of high-voltage power transmission technology. The conductive rod can efficiently dissipate heat and cool the conductive rod without increasing its size or preventing cooling water from directly contacting the rod. The conductive rod of the present invention is hollow internally, forming a channel along its axis. A water flow tube is provided within the channel, extending in the same direction as the channel. Cooling water flows within the water flow tube to absorb heat generated by the conductive rod. A gap is formed between the water flow tube and the conductive rod, and the gap is filled with a liquid insulating medium for transferring heat. The conductive rod of the present invention is used for conducting current in high-voltage power transmission.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage power transmission, and in particular to a conductive rod and a high-voltage bushing. Background Art

[0002] With the continuous development of ultra-high voltage (UHV) transmission technology in my country, the demand for transmission capacity continues to increase, and the voltage and current requirements for high-voltage transmission equipment are also constantly increasing. As a result, high-voltage transmission equipment must withstand the combined effects of high voltage, high current, and strong mechanical loads, resulting in high electrical, thermal, and mechanical stresses within it. Excessive electrical stress and heat loss have severely restricted the application of high-voltage transmission equipment in high-voltage projects.

[0003] High-voltage bushings, a crucial piece of equipment commonly used in the high-voltage power industry, consist of an insulating sleeve and a conductive rod located within the sleeve. Because the conductive rod within the sleeve must withstand high currents, the current flowing through the rod generates heat, making heat dissipation within the sleeve particularly problematic. Most high-voltage bushing insulation failures are caused by excessively high internal temperatures within the sleeve, which in turn leads to thermal expansion of the insulating material within the sleeve. The fundamental cause of excessive internal temperatures is heat generated by the conductive rod during current conduction, which cannot be effectively dissipated, leading to heat accumulation within the sleeve. To address this issue, current approaches have focused on increasing the cross-sectional area, diameter, and thickness of the conductive rod to reduce its resistance and heat generation. However, the increased volume of the conductive rod also increases the overall volume and weight of the high-voltage bushing. Furthermore, the increased weight of the insulating sleeve outside the rod increases the load it must bear, impacting its seismic performance. Summary of the Invention

[0004] The present invention provides a conductive rod and a high-voltage bushing, which can efficiently dissipate heat and cool the conductive rod while keeping the size of the conductive rod unchanged.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] On the one hand, an embodiment of the present invention provides a conductive rod, which is hollow inside and forms a channel along the axial direction. A water flow tube is provided in the channel, and the extension direction of the water flow tube is consistent with the extension direction of the channel. There is cooling water in the water flow tube, and the cooling water flows inside the water flow tube to absorb the heat generated by the conductive rod; there is a gap between the outer tube wall of the water flow tube and the inner tube wall of the conductive rod, and the gap is filled with a liquid insulating medium for transferring heat.

[0007] The conductive rod provided in an embodiment of the present invention has a water flow tube disposed within the conductive rod. Cooling water flows within the water flow tube. The flowing cooling water absorbs the heat generated by the conductive rod and carries the heat out of the rod. This allows efficient heat dissipation and cooling of the conductive rod by utilizing the internal channel without increasing the diameter or volume of the conductive rod, effectively utilizing the internal space of the conductive rod and resulting in a compact structure. This reduces the manufacturing cost of the high-voltage bushing, reduces the load on the insulating sleeve, and improves seismic resistance. Furthermore, since the cooling water flows within the water flow tube, heat is transferred through the liquid insulating medium, avoiding direct contact between the cooling water and the conductive rod and preventing leakage of the cooling water. Furthermore, the liquid insulating medium within the channel has excellent fluidity and thermal conductivity, which improves the heat transfer efficiency between the water flow tube and the conductive rod. It also has a high flash point and is non-flammable. Furthermore, due to the excellent insulating properties of the liquid insulating medium, leakage will not damage the high-voltage bushing.

[0008] Furthermore, a pressure balancing device is connected to the channel of the conductive rod, and the pressure balancing device is used to adapt to the pressure change in the channel caused by thermal expansion of the liquid insulating medium.

[0009] Furthermore, the pressure balancing device is an airbag, which is connected to the channel and can expand and contract according to the pressure inside the airbag.

[0010] Furthermore, the pressure balancing device is a storage tank, the storage tank is communicated with the channel, and a cavity is provided inside the storage tank.

[0011] Furthermore, an exhaust valve is provided on the top of the storage tank.

[0012] Furthermore, the liquid insulating medium includes transformer oil or silicone oil.

[0013] Furthermore, an opening is provided at the first end of the conductive rod, the opening is connected to the channel, the second end of the water flow tube extends into the inner side of the second end of the conductive rod through the opening, and the first end of the water flow tube is located on the outer side of the first end of the conductive rod; a water inlet and a water outlet are provided at the first end of the water flow tube; a sealing portion is also provided at the opening, and the sealing portion is sealed and connected to the gap between the water flow tube and the conductive rod.

[0014] Furthermore, the water inlet direction of the water inlet is parallel to the axial direction of the water flow pipe, and the water outlet direction of the water outlet is parallel to the radial direction of the water flow pipe.

[0015] Furthermore, a water inlet channel and a water outlet channel are provided in the water flow pipe, and the extension direction of the water inlet channel and the water outlet channel is consistent with the extension direction of the water flow pipe. The first end of the water inlet channel is connected to the water inlet, and the first end of the water outlet channel is connected to the water outlet; the second end of the water inlet channel and the second end of the water outlet channel extend to the inner side of the second end of the water flow pipe and are connected to each other.

[0016] Furthermore, the water flow pipe is made of aluminum alloy material.

[0017] On the other hand, an embodiment of the present invention provides a high-voltage bushing, comprising an insulating sleeve and the conductive rod according to the above aspect, wherein the conductive rod is located inside the insulating sleeve.

[0018] The high-voltage bushing provided in an embodiment of the present invention, because it includes the conductive rod provided in the first aspect, can utilize the water flow tube inside the conductive rod for heat dissipation and cooling, eliminating the need to increase the diameter and volume of the conductive rod. Therefore, the overall volume of the high-voltage bushing does not need to be increased, reducing overall weight, saving costs, and improving seismic performance. Furthermore, because the cooling water flows inside the water flow tube, direct contact between the cooling water and the conductive rod is avoided, thereby preventing the cooling water from leaking outside the conductive rod and damaging the insulation performance of the high-voltage bushing. A liquid insulating medium is selected for heat transfer because it has excellent insulation properties and leakage will not damage the high-voltage bushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic structural diagram of a conductive rod provided in an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the structure of a water flow tube inside a conductive rod provided by an embodiment of the present invention;

[0022] Figure 3 A schematic structural diagram of a circular ring fixing disk provided in an embodiment of the present invention.

[0023] Reference numerals:

[0024] 1-conductive rod; 11-channel; 2-water flow pipe; 21-water inlet; 22-water outlet; 23-annular fixing plate; 231-hole; 3-liquid insulating medium; 4-storage tank; 41-cavity; 42-exhaust valve; 43-connecting pipe. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical connections; direct connections or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0027] In the present description, "and / or" is simply a description of the association relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0028] The present invention provides a high-voltage bushing that can be used to insulate the ground of power equipment input and output lines and high-voltage circuits. For example, the high-voltage bushing can be used to connect converter transformers or provide insulation and support for equipment on both sides of a wall.

[0029] Taking the high-voltage bushing connected to a converter transformer as an example, the high-voltage bushing provided in the embodiments of the present application includes an insulating sleeve and an internal conductive rod. Epoxy resin is poured between the conductive rod and the insulating sleeve. The load of the entire high-voltage bushing is borne by the insulating sleeve, while the conductive rod is responsible for conducting current.

[0030] The high-voltage bushing provided in the embodiments of the present application has an internal conductive rod with excellent heat dissipation performance, enabling efficient heat dissipation of the conductive rod without increasing its diameter or volume. Consequently, the overall volume and weight of the high-voltage bushing can be relatively reduced, reducing the load on the insulating sleeve, improving seismic performance, and reducing the cost of the high-voltage bushing. Furthermore, the conductive rod within the high-voltage bushing in the embodiments of the present application can prevent direct contact between the cooling water and the conductive rod, preventing cooling water from leaking outside the conductive rod and damaging the high-voltage bushing.

[0031] Next, the conductive rod included in the above-mentioned high-voltage bushing is further introduced.

[0032] like Figure 1As shown, the conductive rod 1 provided in the embodiment of the present application is hollow, with a channel 11 formed along the axial direction of the conductive rod 1. A water flow tube 2 is disposed within the channel 11. It can be seen that the extension direction of the water flow tube 2 is consistent with the extension direction of the channel 11. Cooling water flows within the water flow tube 2 to absorb the heat generated by the conductive rod 1. A gap is formed between the outer wall of the water flow tube 2 and the inner wall of the conductive rod 1. This gap is filled with a liquid insulating medium 3 for heat transfer.

[0033] Through the water flow tube 2 inside the conductive rod 1, the heat generated by the conductive rod 1 is absorbed by the cooling water within the water flow tube 2 and then carried out of the conductive rod 1 by the flow of the cooling water. Without increasing the diameter and volume of the conductive rod 1, the channel 11 inside the conductive rod 1 is used to dissipate heat and cool the conductive rod 1, effectively utilizing the internal space of the conductive rod 1 and achieving a compact structure. This can reduce the manufacturing cost of the high-voltage bushing, reduce the load on the insulating sleeve, and improve the seismic resistance of the high-voltage bushing.

[0034] Because the cooling water flows within the water flow tube 2, direct contact between the cooling water and the conductive rod 1 is avoided, preventing the cooling water from leaking outside the conductive rod 1 and damaging the insulation performance of the high-voltage bushing. It is understood that if the cooling water is allowed to flow directly into the channel 11 inside the conductive rod 1 to cool the conductive rod 1, if a leak occurs in a certain part of the conductive rod 1, the cooling water will flow outside the conductive rod 1, causing the high-voltage bushing insulation to become damp, resulting in the aforementioned problem of damaging the high-voltage bushing insulation performance and ultimately damaging the high-voltage bushing. However, the present application avoids this problem by allowing the cooling water to flow within the water flow tube 2.

[0035] At the same time, due to the gap between the conductive rod 1 and the water flow tube 2, simply using air for heat transfer is inefficient. To accelerate the heat exchange between the cooling water in the water flow tube 2 and the conductive rod 1, a liquid insulating medium 3 is filled in the gap between them. The liquid insulating medium 3 has excellent thermal conductivity and fluidity, serving as a heat transfer medium between the conductive rod 1 and the water flow tube 2, accelerating the heat exchange between them. It also has a high flash point, is non-flammable, and does not pose a risk of combustion due to excessive temperatures. Furthermore, the liquid insulating medium 3 has excellent insulating properties. Even if the liquid insulating medium 3 leaks, it will not leak outside the conductive rod 1 and damage the high-voltage bushing.

[0036] The liquid insulating medium 3 may be silicone oil or transformer oil, etc. Preferably, transformer oil is selected as the liquid insulating medium.

[0037] It should be noted that due to the important role of conductive rod 1 in guiding the flow, it is generally made of pure copper. The water flow pipe 2, on the other hand, needs to be watertight to prevent leakage of cooling water and also has to have good thermal conductivity. Therefore, the water flow pipe can be made of a light metal material with good watertightness, such as aluminum or an aluminum alloy. Here, the water flow pipe 2 is made of an aluminum alloy.

[0038] In some embodiments, a pressure balancing device is also connected to the channel 11. The pressure balancing device is used to adapt to the pressure changes in the channel 11 caused by the thermal expansion of the liquid insulating medium 3. Since the liquid insulating medium 3 expands when heated, and the space inside the conductive rod 1 is fixed, when the internal temperature of the conductive rod 1 rises, the liquid insulating medium 3 will expand, resulting in excessive internal pressure. If there is no corresponding device to reduce pressure, accidents may occur when the pressure is too high. Here, Figure 1 As shown, a storage tank 4 is connected to the channel, and a cavity is provided in the storage tank 4. By providing a storage tank 4, the liquid insulating medium can flow into the storage tank 4. In this way, when the internal temperature of the conductive rod 1 increases, the expanded liquid insulating medium 3 can enter the storage tank 4, thereby reducing the pressure inside the channel 11 and preventing accidents.

[0039] Optional, such as Figure 1 As shown, an exhaust valve 42 can be provided at the top of the storage tank 4. When the temperature of the conductive rod 1 is high and the liquid insulating medium 3 expands significantly due to heat, the exhaust valve 42 opens to discharge the air compressed by the thermal expansion of the liquid insulating medium 3. After the temperature of the conductive rod 1 drops and the liquid insulating medium 3 recovers, the exhaust valve 42 closes.

[0040] from Figure 1 As can be seen, a connecting pipe 43 is connected to the storage tank 4, one end of the connecting pipe 43 is connected to the cavity 41 inside the storage tank 4, and the other end of the connecting pipe 43 is connected to the channel 11 inside the conductive rod 1. The liquid insulating medium 3 can enter the cavity 41 inside the storage tank 4 from the channel 11 through the connecting pipe 43.

[0041] In addition, the above storage box 4 can also be replaced with an air bag, which has a certain elasticity and can expand and contract according to the size of its internal pressure. Figure 1 If the storage tank 4 is replaced with an airbag, then when the liquid insulating medium 3 expands due to heat, the pressure inside the airbag increases, causing it to expand accordingly. When the temperature of the liquid insulating medium 3 decreases, the pressure inside the airbag decreases, causing it to gradually contract. It can be seen that the airbag can automatically adjust according to the internal pressure, without the need for manual intervention.

[0042] Further, if Figure 1As shown, an opening is provided at the first end of the conductive rod 1, and the second end of the water flow tube 2 extends into the inner side of the second end of the conductive rod 1 through the opening. A water inlet 21 and a water outlet 22 are provided at the first end of the water flow tube 2. The water inlet 21 and the water outlet 22 are located outside the first end of the conductive rod 1, that is, the water inlet 21 and the water outlet 22 are located outside the conductive rod 1. This arrangement facilitates the connection of the water inlet 21 and the water outlet 22 on the water flow tube 2 to the corresponding water inlet pipe and water outlet pipe. At the same time, in order to prevent the liquid insulating medium 3 from flowing out of the opening, a sealing portion is provided at the opening. The sealing portion is sealed and connected to the gap between the water flow tube 2 and the conductive rod 1 to prevent the liquid insulating medium 3 from flowing out of the opening. The sealing portion can be provided at the opening by a snap-fit method.

[0043] In order to fix the water flow tube 2 inside the conductive rod 1, a fixing structure can be provided. Here, since the liquid insulating medium 3 is provided in the channel 11, a fixing structure can be provided at the first end of the conductive rod 1 to keep the axis of the water flow tube 2 and the axis of the conductive rod 13 parallel to each other. Figure 1 and Figure 2 As shown, a circular fixing disk 23 is fixedly connected to the opening of the conductive rod 1. The outer ring diameter of the circular fixing disk 23 is greater than or equal to the diameter of the conductive rod 1. The inner ring of the circular fixing disk 23 and the water flow tube 2 are clearance-fitted, and the water flow tube 2 passes through the inner ring of the circular fixing disk 23. In this way, because the circular fixing disk 23 is fixedly connected to the opening of the first end of the conductive rod 1, the water flow tube 2 can remain fixed under the restriction of the circular fixing disk 23. At the same time, the circular fixing disk 23 can also seal the gap existing at the opening, achieving a sealing effect, thereby preventing the liquid insulating medium 3 from flowing out. It can be understood that the water flow tube 2 can be fixed in a variety of ways, as long as the water flow tube 2 can be maintained in a fixed position, and no further limitations are given here.

[0044] The fixing of the annular fixing plate 23 to the opening can be done by threaded connection. Figure 3 The structural diagram of the annular fixing plate 23 is shown, and the tube wall of the conductive rod 1 and the annular fixing plate 23 are fixed through the hole 231. Of course, other methods can also be used for fixing.

[0045] In some implementations, such as Figure 1 As shown, the water inlet direction of the water inlet 21 is parallel to the axial direction of the water flow tube 2, and the water outlet direction of the water outlet 2 is parallel to the radial direction of the water flow tube 2. The water inlet and water outlet directions are perpendicular to each other. Other water inlet and water outlet directions can also be selected. For example, the water inlet direction of the water inlet 21 and the water outlet direction of the water outlet 22 are both parallel to the axial direction of the water flow tube 2. Of course, the setting directions of the water inlet 21 and the water outlet 22 are not limited to the above methods, and other methods can also be selected according to actual conditions. Here, select Figure 1 In the manner shown, the water inlet 21 and the water outlet 22 can be relatively separated from each other, and in actual operation, it is convenient to install and place the corresponding water pipes connected to the water inlet 21 and the water outlet 22.

[0046] Furthermore, the interior of the water flow tube 2 may be provided with a water inlet channel and a water outlet channel. The extension direction of the water inlet channel and the water outlet channel are consistent with the extension direction of the water flow tube 2. The first end of the water inlet channel is connected to the water inlet 21, and the first end of the water outlet channel is connected to the water outlet 22. The second end of the water inlet channel and the second end of the water outlet channel extend to the inside of the second end of the water flow tube 2 and are connected to each other. By dividing the interior of the water flow tube 2, the cooling water can flow in a certain direction within the water flow tube 2, which can increase the flow rate and thus improve the heat exchange efficiency.

[0047] It should be noted that the water flow tube 2 can also be provided without a water inlet and outlet channel. In this case, the water flow tube 2 is hollow, with no distinct channels. The cooling water fills the interior of the water flow tube 2, and the water inlet and outlet are connected to corresponding water pipes to control the flow of cooling water into and out of the water flow tube. This configuration simplifies the structure of the water flow tube 2 and makes it more convenient to manufacture.

[0048] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A conductive rod, characterized in that: The interior of the conductive rod is hollow and extends in the axial direction to form a channel. A water flow tube is provided in the channel, and the extension direction of the water flow tube is consistent with the extension direction of the channel. The water flow tube contains cooling water, and the cooling water flows inside the water flow tube to absorb the heat generated by the conductive rod. There is a gap between the outer tube wall of the water flow tube and the inner tube wall of the conductive rod. The gap is filled with a liquid insulating medium, and the liquid insulating medium is used to transfer heat.

2. The conductive rod according to claim 1, characterized in that: A pressure balancing device is communicated with the channel, and the pressure balancing device is used to adapt to pressure changes in the channel caused by thermal expansion of the liquid insulating medium.

3. The conductive rod according to claim 2, characterized in that: The pressure balancing device is an airbag, which is communicated with the channel; the airbag can expand and contract according to the internal pressure.

4. The conductive rod according to claim 2, characterized in that: The pressure balancing device is a storage tank, which is communicated with the channel and has a cavity inside.

5. The conductive rod according to claim 4, characterized in that: An exhaust valve is provided on the top of the storage tank.

6. The conductive rod according to any one of claims 1 to 5, characterized in that: The liquid insulating medium includes transformer oil or silicone oil.

7. The conductive rod according to claim 1, characterized in that: The first end of the conductive rod is provided with an opening, which is connected to the channel. The second end of the water flow tube extends into the inner side of the second end of the conductive rod through the opening, and the first end of the water flow tube is located on the outer side of the first end of the conductive rod; the first end of the water flow tube is provided with a water inlet and a water outlet; the opening is also provided with a sealing portion, which seals the gap between the water flow tube and the conductive rod.

8. The conductive rod according to claim 7, characterized in that: The water inlet direction of the water inlet is parallel to the axial direction of the water flow pipe, and the water outlet direction of the water outlet is parallel to the radial direction of the water flow pipe.

9. The conductive rod according to claim 7, characterized in that: A water inlet channel and a water outlet channel are provided in the water flow pipe, and the extension direction of the water inlet channel and the water outlet channel is consistent with the extension direction of the water flow pipe. The first end of the water inlet channel is connected to the water inlet, and the first end of the water outlet channel is connected to the water outlet; the second end of the water inlet channel and the second end of the water outlet channel extend to the inner side of the second end of the water flow pipe and are connected to each other.

10. The conductive rod according to claim 1, characterized in that: The water flow pipe is made of aluminum alloy material.

11. A high voltage bushing, characterized in that: The invention comprises an insulating sleeve and a conductive rod according to any one of claims 1 to 10, wherein the conductive rod is located inside the insulating sleeve.

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