Insulated tube type busbar and manufacturing method thereof

Abstract

The application relates to the field of high-voltage insulating bus bars, in particular to an insulating tube type bus bar and a manufacturing method thereof. The insulating tube type bus bar comprises a tube body, wiring terminals arranged at two ends of the tube body, a bus bar conductor arranged in the tube body and connected with the wiring terminals, a connecting flange arranged on the bus bar conductor and close to the two ends of the bus bar conductor, and a metal bellows fixedly and sealingly connected with the two connecting flanges and arranged on the outer side of the bus bar conductor. The metal bellows is filled with insulating filling paste. The insulating tube type bus bar with any length can be processed, the use frequency of the connecting structure is reduced, and the effect of ensuring the smoothness of the circuit is achieved.

Description

Technical Field

[0001] This application relates to the field of high-voltage insulated busbars, and in particular to an insulated tubular busbar and its manufacturing method. Background Technology

[0002] Currently, insulated tubular busbars are increasingly recognized and accepted by customers and are widely used in power transmission and transformation lines due to their characteristics such as high current capacity, good heat dissipation, low power loss, high mechanical strength, good insulation performance, resistance to environmental interference, high safety factor, convenient installation and maintenance, and long service life.

[0003] Commonly used methods for manufacturing insulated tubular busbars include epoxy resin casting, extrusion, and wrapping. Taking epoxy resin casting as an example, an epoxy resin vacuum impregnated paper solid insulation structure is used, and semi-conductive voltage equalization shielding layers are provided on the solid insulation layer. The insulation structure is formed in one step, which makes the axial and radial field strength at the end of the insulated busbar uniform.

[0004] Regarding the above solution, the inventors discovered that: due to the current limitation on the processing length of insulated tubular busbars, when using existing insulated tubular busbars over a large span, it is necessary to use some connection structures to connect two adjacent insulated tubular busbars together. Improper handling of the connection points of the insulated tubular busbars can lead to some accidents and affect the smooth operation of the circuit. Summary of the Invention

[0005] This application provides an insulated tubular busbar and its manufacturing method to enable people to process insulated tubular busbars of arbitrary length, reduce the frequency of use of connection structures, and ensure smooth circuit operation.

[0006] The above-mentioned technical objective of this application is achieved through the following technical solution:

[0007] An insulated tubular busbar includes a tubular body with terminals at both ends. A busbar conductor connected to the terminals is disposed inside the tubular body. Connecting flanges are fitted on the busbar conductor near both ends. A metal corrugated tube is fitted on the outside of the busbar conductor and is fixedly and sealed to the two connecting flanges. The inside of the metal corrugated tube is filled with insulating filler paste.

[0008] By adopting the above scheme, after the metal corrugated tube is sleeved on the outside of the busbar conductor, insulating filler is injected into the inside of the metal corrugated tube. The insulating filler itself also has a certain insulating effect, and it can also ensure the sealing performance inside the metal corrugated tube and support it. In this way, people can produce and process insulated tubular busbars of longer lengths as needed, thereby reducing the use of connection structures and achieving the effect of processing insulated tubular busbars of any length as needed, reducing the frequency of use of connection structures, and ensuring smooth circuit operation.

[0009] Preferably, the insulating filler paste has a density of less than 0.6 g / ml, a volume resistivity of greater than 1.0*1013 Ω·m, a viscosity of less than 50000 mPa.s, and a cone penetration at room temperature between 300-500 dmm.

[0010] Preferably, an insulating support column is fitted on the busbar conductor to abut against the inner wall of the metal corrugated pipe.

[0011] Preferably, the metal corrugated pipe has an injection hole and an overflow hole, which are respectively located near both ends of the metal corrugated pipe.

[0012] Preferably, an aluminum stress cone is provided on the side of the connecting flange away from the center of the busbar conductor.

[0013] Preferably, an insulating tube is provided between the terminal block and the connecting flange, the inside of the insulating tube is filled with insulating filler, and an end flange is provided at the end of the insulating tube away from the connecting flange for fixed connection with the terminal block.

[0014] Preferably, the outer side of the insulating tube is fitted with a climbing skirt made of silicone rubber.

[0015] Preferably, the connecting flange has a through hole extending through itself.

[0016] Preferably, a grounding wire is provided on the connecting flange.

[0017] A method for manufacturing an insulated tubular busbar includes the following steps:

[0018] Preparation: Cut the required lengths of corrugated metal pipe and insulating pipe to manufacture stress cones;

[0019] Installation: Fix the stress cone and insulating tube to one side of the connecting flange, attach the climbing umbrella skirt to the outer surface of the insulating tube, fix the end flange to the side of the insulating tube away from the connecting flange, so that the bus conductor passes through the end flange and is fixedly connected to the end flange, and install the metal bellows on the connecting flange.

[0020] Injection: Evacuate the metal corrugated tube and the insulating tube, and add insulating filler paste into the metal corrugated tube at the injection hole until the metal corrugated tube and the insulating tube are full of insulating filler paste. Seal the injection hole and the overflow hole.

[0021] Grounding: Connect the grounding wire to the metal corrugated pipe at the same potential and then ground it.

[0022] In summary, this application has the following technical effects:

[0023] 1. By setting up an insulated tubular busbar that includes a metal corrugated tube and insulating filler grease, people can cut metal corrugated tubes of a specified length as needed and fit them on the outside of the busbar conductor. Then, the insulating filler grease is injected into the metal corrugated tube. The insulating filler grease insulates the metal corrugated tube. Moreover, the metal corrugated tube can be adjusted to a certain angle as needed, so that people can process insulated tubular busbars of any length as needed, reduce the frequency of use of connection structures, and ensure smooth circuit.

[0024] 2. By setting up insulating support columns, the outer surface of the insulating support columns abuts against the inner wall of the metal corrugated pipe, which can support the metal corrugated pipe and make the metal corrugated pipe more stable when installed on the bus conductor.

[0025] 3. By setting up injection holes and overflow holes, people can inject insulating filler into the metal corrugated pipe at the injection hole. When the insulating filler fills the metal corrugated pipe, it will flow to the outside of the metal corrugated pipe from the overflow hole. This makes it convenient to add insulating filler into the metal corrugated pipe and ensures that the metal corrugated pipe is filled with insulating filler.

[0026] 4. By installing insulating tubes at the ends and stress cones inside, the electric field at the ends of the insulated busbar meets the insulation requirements. Attached Figure Description

[0027] Figure 1 This is an overall structural diagram of the insulated tubular busbar in the embodiments of this application;

[0028] Figure 2 This is a cross-sectional view of the insulated tubular busbar in the embodiment of this application.

[0029] In the diagram, 1. Pipe body; 11. Busbar conductor; 12. Connecting flange; 13. Corrugated pipe; 14. Insulating support column; 15. Insulating filler paste; 16. Paste injection hole; 17. Paste overflow hole; 2. Terminal block; 3. Stress cone; 4. Insulating pipe; 5. End flange; 6. Creep skirt; 7. Grounding wire. Detailed Implementation

[0030] The present application will be further described in detail below with reference to the accompanying drawings.

[0031] Reference Figure 1 This application provides an insulated tubular busbar, including a tube body 1 and terminals 2. There are two terminals 2, which are respectively located at both ends of the tube body 1. The length of the tube body 1 can be determined according to people's needs.

[0032] Reference Figure 1 and Figure 2 The pipe body 1 includes a busbar conductor 11, connecting flanges 12, a metal corrugated pipe 13, insulating support columns 14, and insulating filler 15. The two ends of the busbar conductor 11 are fixedly connected to two terminals 2. Two connecting flanges 12 are provided, each sleeved on the busbar conductor 11, and positioned close to both ends of the busbar conductor 11. The metal corrugated pipe 13 is made of stainless steel and is sleeved on the outside of the busbar conductor 11, with a gap between the metal corrugated pipe 13 and the busbar conductor 11. The two ends of the metal corrugated pipe 13 are... The two connecting flanges 12 are sealed and fixedly connected to each other at their respective end faces; the connecting flanges 12 are provided with a grounding wire 7 that is reliably connected to the metal bellows 13 and connected to the ground; the insulating support column 14 is sleeved on the bus conductor 11, and the position of the insulating support column 14 on the bus conductor 11 is between the two connecting flanges 12. The number of insulating support columns 14 can be 3 or more, and the number of insulating support columns 14 is determined by the specific length of the bus conductor 11. The outer surface of the insulating support ring 14 abuts against the inner surface of the metal bellows 13, and the insulating filler 15 is filled inside the metal bellows 13.

[0033] In this embodiment, the relevant coefficients of the insulating filler paste 15 are as follows: density less than 0.6 g / ml, volume resistivity greater than 1.0*1013 Ω·m, viscosity less than 50000 mPa.s, and cone penetration at room temperature between 300-500 dmm.

[0034] After the metal corrugated tube 13 is fitted onto the outside of the bus conductor 11, insulating filler 15 is injected into the inside of the metal corrugated tube 13. The insulating filler 15 ensures the insulation of the bus. In this way, people can produce and process insulated tubular busbars of larger lengths as needed, which reduces the use of connection structures and achieves the effect of processing insulated tubular busbars of any length as needed, reducing the frequency of use of connection structures, and ensuring smooth circuit. Furthermore, the insulating support ring 14 installed on the bus conductor 11 can also support the corrugated tube 13, reducing the possibility of large deformation of the corrugated tube 13.

[0035] To facilitate the filling of insulating filler 15 into the metal corrugated tube 13, an injection hole 16 and an overflow hole 17 are provided on the metal corrugated tube 13. The injection hole 16 and the overflow hole 17 are respectively located near both ends of the corrugated tube 13. In this embodiment, the metal corrugated tube 13 is set with its central axis horizontal. At this time, the central axes of the injection hole 16 and the overflow hole 17 are both vertical. The injection hole 16 is opened downward on the corrugated tube 13, and the overflow hole 17 is opened upward on the metal corrugated tube 13. Insulating filler 15 is injected into the metal corrugated tube 13 at the injection hole 16. When the metal corrugated tube 13 is full of insulating filler 15, the insulating filler 15 will flow upward to the outside of the metal corrugated tube 13 at the overflow hole 17. This can ensure that the metal corrugated tube 13 is filled with insulating filler 15, and ensure that the insulating tube busbar can meet the manufacturing requirements.

[0036] An aluminum stress cone 3 is provided on the end face of the connecting flange 12 away from the center of the bus conductor 11. The stress cone 3 can improve the electric field on one side of the connecting flange 12. An insulating tube 4 is sleeved on the outside of the stress cone 3. One end of the insulating tube 4 near the connecting flange 12 is coaxially and fixedly connected to the connecting flange 12. The other end of the insulating tube 4 extends towards the terminal 2 and is fixedly connected to the terminal 2. An end flange 5 is provided between the terminal 2 and the insulating tube 4. The end flange 5 is also coaxially connected to the insulating tube 4. Multiple through holes are provided on the connecting flange 12 to allow the insulating filler grease 15 inside the metal corrugated tube 13 to enter the insulating tube 4. A silicone rubber climbing skirt 6 is sleeved on the outside of the insulating tube 4.

[0037] This application also provides a method for manufacturing an insulated tubular busbar, comprising the following steps:

[0038] Preparation: Cut the metal corrugated pipe 13 and insulating pipe 4 to the required lengths as needed, and manufacture the stress cone 3;

[0039] Installation: Fix the stress cone 3 and the insulating tube 4 to one side of the connecting flange 12, attach the climbing umbrella skirt to the outer surface of the insulating tube 4, fix the end flange 5 to the side of the insulating tube 4 away from the connecting flange 12, so that the bus conductor 11 passes through the end flange 5 and is fixedly connected to the end flange 5, and install the metal bellows 13 on the connecting flange 12.

[0040] Injection: Empty the metal corrugated tube 13 and the insulating tube 4, add the insulating filler paste 15 into the metal corrugated tube 13 at the injection hole 16 until the metal corrugated tube 13 and the insulating tube 4 are filled with insulating filler paste 15, and seal the injection hole 16 and the overflow hole 17.

[0041] Grounding: Connect the grounding wire 7 to the metal corrugated pipe 13 at the same potential and then ground it.

[0042] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. An insulated tubular busbar, characterized in that: The device includes a pipe body (1), with terminals (2) at both ends. A bus conductor (11) connected to the terminals (2) is installed inside the pipe body (1). Connecting flanges (12) are fitted on the bus conductor (11) near both ends. A metal bellows (13) is fitted on the outside of the bus conductor (11) and is fixedly and sealed to the two connecting flanges (12). The metal bellows (13) is filled with insulating filler paste (15). A paste injection hole (16) and an overflow hole (17) are opened on the metal bellows (13). The paste injection hole (16) and the overflow hole (17) are respectively opened near both ends of the metal bellows (13). A grounding wire (7) is provided on the connecting flange (12) and is equipotentially connected to the metal bellows (13) and connected to the ground.

2. The insulated tubular busbar according to claim 1, characterized in that: The density of the insulating filler paste (15) is less than 0.6 g / ml, the volume resistivity is greater than 1.0*1013 Ω·m, the viscosity is less than 50000 mPa.s, and the cone penetration at room temperature is between 300-500 dmm.

3. An insulated tubular busbar according to claim 1, characterized in that: An insulating support column (14) is installed on the bus conductor (11) to abut against the inner wall of the metal bellows (13).

4. An insulated tubular busbar according to claim 1, characterized in that: An aluminum stress cone (3) is provided on the side of the connecting flange (12) away from the center of the bus conductor (11).

5. An insulated tubular busbar according to claim 4, characterized in that: An insulating tube (4) is provided between the terminal block (2) and the connecting flange (12). The insulating tube (4) is filled with insulating filler paste (15). An end flange (5) is provided at the end of the insulating tube (4) away from the connecting flange (12) and is fixedly connected to the terminal block (2).

6. An insulated tubular busbar according to claim 5, characterized in that: The insulating tube (4) is fitted with a silicone rubber climbing skirt (6) on the outside.

7. An insulated tubular busbar according to claim 6, characterized in that: The connecting flange (12) has a through hole that penetrates itself.

8. A method for manufacturing an insulated tubular busbar, characterized in that: Includes the following steps: Preparation: Cut out metal corrugated pipes (13) and insulating pipes (4) of the appropriate length as needed, and manufacture stress cones (3); Installation: Fix the stress cone (3) and the insulating tube (4) to one side of the connecting flange (12), attach the parapet skirt to the outer surface of the insulating tube (4), fix the end flange (5) to the side of the insulating tube (4) away from the connecting flange (12), make the bus conductor (11) pass through the end flange (5) and be fixedly connected to the end flange (5), and install the corrugated pipe (13) on the connecting flange (12); Injection: Empty the metal corrugated tube (13) and the insulating tube (4), add the insulating filler paste (15) into the corrugated tube (13) at the injection hole (16) until the corrugated tube (13) and the insulating tube (4) are filled with insulating filler paste (15), and seal the injection hole (16) and the overflow hole (17). Grounding: Connect the grounding wire (7) to the metal corrugated pipe (13) at the same potential and ground it.

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