Power conversion terminal for 220kV overhead transmission line

Abstract

The utility model discloses a power conversion terminal for a 220kV overhead power transmission line, which comprises an upper flange, a lower flange, a power conversion terminal and a power conversion terminal, and is characterized in that a wire outlet fitting is arranged on one side of the upper flange and is used for connecting an overhead line; the insulating sleeve is fixedly connected with the upper flange; the connecting rod is located on the inner side of the insulating sleeve, one end of the connecting rod is connected with the outgoing line fitting, and the other end is provided with a first plugging structure; the gas tank is connected to the end, away from the upper flange, of the insulating sleeve and communicates with the insulating sleeve, and a mounting opening is formed in the end, away from the upper flange, of the gas tank; the GIS terminal comprises a stress cone and an epoxy sleeve, the stress cone is sleeved on the cable, the epoxy sleeve is sleeved on the stress cone, the epoxy sleeve is detachably connected to the gas tank, one end of the epoxy sleeve is provided with a binding post, one end of the binding post is provided with a second plug-in structure, the other end of the binding post is connected with a conductor in the cable, and the second plug-in structure is matched with the first plug-in structure in a plug-in manner; the gas tank and the insulating sleeve are filled with insulating gas. The utility model has the advantages of simple installation and light weight.

Description

Technical Field

[0001] This utility model relates to the field of overhead power transmission, and in particular to a transfer terminal for a 220kV overhead power transmission line. Background Technology

[0002] In the actual operating environment of overhead transmission lines, factors such as line aging, improper construction in surrounding areas, foundation settlement, and natural disasters can all lead to faults in overhead transmission lines, causing widespread power outages. Urban expansion and municipal construction relocation projects also pose challenges, as the relocation and repair of overhead lines are generally time-consuming, resulting in prolonged power outages. Using temporary overhead lines for temporary power transmission is costly and inconvenient to install. Dispatching other lines for temporary power supply may overload the system and increase the risk of further power outages caused by line faults. To address these issues, transfer terminals are generally used. However, traditional transfer terminals are complex to install, and the internal insulation materials are often liquid or solid, making them heavy. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a power transfer terminal for 220kV overhead transmission lines, which is easy to install and lightweight.

[0004] The 220kV overhead transmission line transfer terminal according to an embodiment of the present invention includes:

[0005] Upper flange, with a cable outlet fitting provided on one side of the upper flange, the cable outlet fitting being used to connect overhead lines;

[0006] Insulating sleeve, fixedly connected to the upper flange;

[0007] A connecting rod is located inside the insulating sleeve. One end of the connecting rod is connected to the outgoing hardware, and the other end is provided with a first plug-in structure.

[0008] A gas cylinder is connected to the end of the insulating sleeve away from the upper flange and communicates with the insulating sleeve. The end of the gas cylinder away from the upper flange is provided with an installation port.

[0009] The GIS terminal includes a stress cone and an epoxy sleeve. The stress cone is sleeved on the cable and located inside the gas tank. The epoxy sleeve is sleeved on the stress cone and is detachably connected to the gas tank and seals the installation port. One end of the epoxy sleeve facing the connecting rod is provided with a terminal post. One end of the terminal post is provided with a second plug-in structure, and the other end is connected to a conductor inside the cable. The second plug-in structure is plugged into and cooperates with the first plug-in structure.

[0010] The gas cylinder and the insulating sleeve are filled with insulating gas.

[0011] The 220kV overhead transmission line transfer terminal according to the present utility model embodiment has at least the following beneficial effects:

[0012] By setting a second plug-in structure on the terminal block of the GIS terminal and a first plug-in structure adapted to the second plug-in structure on the connecting rod inside the insulating sleeve, the GIS terminal can be inserted from the installation port of the gas cylinder during the assembly of the power transfer terminal. The second plug-in structure on the terminal block and the first plug-in structure on the connecting rod can then be plugged in and engaged. The epoxy sleeve is then connected to the gas cylinder, enabling rapid assembly and easy installation of the power transfer terminal. By filling the gas cylinder and insulating sleeve with insulating gas as an insulating agent, the overall weight can be reduced, facilitating transportation and installation. In addition, conventional liquid insulation filling methods are prone to generating air bubbles during transportation and hoisting, requiring a long settling time before operation. This implementation uses gas as an insulating agent, which solves the above problems and facilitates transportation and on-site hoisting and assembly during emergency repairs.

[0013] According to some embodiments of this utility model, the insulating gas is SF6 gas.

[0014] According to some embodiments of the present invention, the insulating sleeve includes an inner layer and an outer layer disposed on the outer surface of the inner layer. The material of the inner layer includes fiberglass, and the material of the outer layer includes silicone rubber.

[0015] According to some embodiments of this utility model, a shielding cylinder is provided on the inner side of the insulating sleeve near the gas tank, and the shielding cylinder is distributed around the connecting rod.

[0016] According to some embodiments of this utility model, the gas tank is equipped with a pressure gauge and a vent valve.

[0017] According to some embodiments of the present invention, the first plug-in structure includes multiple plug connectors, and the second plug-in structure includes multiple plug interfaces, wherein the plug connectors and the plug interfaces correspond one-to-one and are plugged in and engaged.

[0018] According to some embodiments of the present invention, a lower flange is also included, which is fixedly connected to the gas tank by fasteners. The epoxy sleeve is provided with an annular flange on the outside of the gas tank, and the annular flange is sandwiched between the lower flange and the gas tank.

[0019] According to some embodiments of the present invention, the GIS terminal further includes a cone support assembly, which is sleeved on the stress cone and connected to the epoxy sleeve, and the cone support assembly is used to support the stress cone.

[0020] According to some embodiments of the present invention, the cone support assembly includes a cone support and a spring mechanism. The cone support is sleeved on the stress cone to abut against the stress cone. The spring mechanism is connected to the epoxy sleeve and is used to apply an elastic force to the cone support to achieve the support of the cone support for the stress cone.

[0021] According to some embodiments of the present invention, one end of the epoxy sleeve is connected to a tail tube, the tail tube is sleeved on the cable, and the cone support assembly is located inside the tail tube.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 This is a schematic diagram of the structure of a power transfer terminal for a 220kV overhead transmission line according to an embodiment of this utility model;

[0025] Figure 2 yes Figure 1 Enlarged diagram of point A in the middle.

[0026] Icon labels:

[0027] Upper flange 100, outgoing cable fittings 110;

[0028] Insulating sleeve 200, inner layer 201, outer layer 202, shielding cylinder 210;

[0029] Connecting rod 300, plug connector 301;

[0030] Gas cylinder 400, pressure gauge 410, vent valve 420;

[0031] GIS terminal 500, stress cone 510, epoxy sleeve 520, annular flange 521, terminal block 530, plug interface 531, cone support 540, spring mechanism 550, tailpipe 560;

[0032] Cable 600;

[0033] Lower flange 700. Detailed Implementation

[0034] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0035] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.

[0037] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0038] The present invention provides a 220kV overhead transmission line transfer terminal according to one embodiment, comprising: an upper flange 100, an insulating sleeve 200, a connecting rod 300, a gas tank 400, and a GIS terminal 500.

[0039] A cable outlet fitting 110 is provided on one side of the upper flange 100. The cable outlet fitting 110 is used to connect to the overhead line via a jumper.

[0040] The insulating sleeve 200 is fixedly connected to the upper flange 100. It should be noted that the insulating sleeve 200 and the upper flange 100 are sealed together, and the material of the insulating sleeve 200 includes at least insulating material.

[0041] The connecting rod 300 is located inside the insulating sleeve 200. One end of the connecting rod 300 is connected to the outgoing fitting 110. Obviously, both the connecting rod 300 and the outgoing fitting 110 are conductive. The other end of the connecting rod 300 is provided with a first plug-in structure.

[0042] Gas cylinder 400 is connected to the end of insulating sleeve 200 away from upper flange 100 and communicates with insulating sleeve 200. It can be understood that gas cylinder 400 and insulating sleeve 200 are also sealed together; gas cylinder 400 is provided with an installation port at the end away from upper flange 100.

[0043] The GIS terminal 500 includes a stress cone 510 and an epoxy sleeve 520. The stress cone 510 is sleeved on the cable 600 and located inside the gas tank 400. The stress cone 510 and the cable 600 are interference-fitted. The stress cone 510 is made of EPDM rubber and manufactured by rubber injection equipment, with a breakdown strength greater than 32kV / mm. The epoxy sleeve 520 is sleeved on the stress cone 510 and is detachably connected to the gas tank 400 and has a sealed installation port. One end of the epoxy sleeve 520 facing the connecting rod 300 is provided with a terminal post 530. One end of the terminal post 530 is provided with a second plug-in structure, and the other end is connected to the conductor inside the cable 600. The second plug-in structure is plugged into the first plug-in structure. In use, the cable 600 is connected to the connecting rod 300 and the outgoing hardware 110 through the terminal post 530. The outgoing hardware 110 is connected to the overhead line through a jumper wire, thus completing the overhead line power transfer channel. The gas cylinder 400 and the insulating sleeve 200 are filled with insulating gas. Understandably, when assembling the power transfer terminal, the cable 600 and the GIS terminal 500 are assembled first. Then, the GIS terminal 500 is inserted into the mounting port of the gas cylinder 400, so that the second plug-in structure on the terminal block 530 engages with the first plug-in structure on the connecting rod 300. Next, the epoxy sleeve 520 is connected to the gas cylinder 400. Finally, the gas cylinder 400 and the insulating sleeve 200 are evacuated and filled with insulating gas.

[0044] This utility model embodiment of the 220kV overhead transmission line transfer terminal uses a second plug-in structure on the terminal block 530 of the GIS terminal 500 and a first plug-in structure adapted to the second plug-in structure on the connecting rod 300 inside the insulating sleeve 200. This allows for quick assembly and easy installation of the transfer terminal by inserting the GIS terminal 500 into the installation port of the gas tank 400, allowing the second plug-in structure on the terminal block 530 to engage with the first plug-in structure on the connecting rod 300, and then connecting the epoxy sleeve 520 to the gas tank 400. Furthermore, by filling the gas tank 400 and the insulating sleeve 200 with insulating gas as an insulating agent, the overall weight is reduced, facilitating transportation and installation. Additionally, conventional liquid insulation filling methods often result in air bubbles forming during transportation and hoisting, requiring a long settling time before operation. This embodiment, by using gas as an insulating agent, solves this problem, facilitating transportation and on-site hoisting and assembly during emergency repairs.

[0045] In some embodiments of this invention, the insulating gas is SF6 gas, which has excellent insulating properties.

[0046] Reference Figure 1 and Figure 2As shown, in some embodiments of this utility model, the insulating sleeve 200 includes an inner layer 201 and an outer layer 202 disposed on the outer surface of the inner layer 201. The inner layer 201 is made of fiberglass, and the outer layer 202 is made of silicone rubber. The outer layer 202, made of silicone rubber, mainly serves an insulating function, while the inner layer 201, made of fiberglass, can provide sufficient support strength. Obviously, the inner layer 201 and the outer layer 202 can also be combined with some other materials according to actual usage requirements.

[0047] Reference Figure 1 and Figure 2 As shown, in some embodiments of this utility model, a shielding cylinder 210 is provided on the inner side of the insulating sleeve 200 near the gas tank 400. The shielding cylinder 210 extends into the insulating sleeve 200 and is distributed around the connecting rod 300. The shielding cylinder 210 is provided to improve the electric field.

[0048] Reference Figure 1 and Figure 2 As shown, in some embodiments of this utility model, the gas tank 400 is equipped with a pressure gauge 410 and a vent valve 420. After the power transfer terminal is assembled, the gas tank 400 and the insulating sleeve 200 can be evacuated by a vacuuming device. The internal pressure is detected by the pressure gauge 410. After the vacuum standard is reached, insulating gas is filled into the gas tank 400 through the inflation valve.

[0049] Reference Figure 1 and Figure 2 As shown, in some embodiments of this utility model, the first plug-in structure includes multiple plugs 301, and the second plug-in structure includes multiple plug interfaces 531. The plugs 301 and plug interfaces 531 correspond one-to-one and are plugged in. When assembling the power transfer terminal, the cable 600 and the GIS terminal 500 can be assembled together first. Then, the GIS terminal 500 is inserted into the gas tank 400, so that the plug interface 531 of the terminal block 530 cooperates with the plug 301 of the connecting rod 300 to realize the connection between the cable 600 and the connecting rod 300. After that, the GIS terminal 500 is connected and fixed to the gas tank 400. Through the above settings, the plug-in assembly of the cable 600 and the GIS terminal 500 can be realized, making the equipment assembly more convenient and improving work efficiency.

[0050] In some specific embodiments, the GIS terminal for 220kV overhead transmission lines also includes a lower flange 700. The lower flange 700 is fixedly connected to the gas tank 400 by bolts or other fasteners. The epoxy sleeve 520 has an annular flange 521 on the outside of the gas tank 400. The annular flange 521 is sandwiched between the lower flange 700 and the gas tank 400. In this way, the epoxy sleeve 520 is fixed to the gas tank 400 by the lower flange 700, that is, the GIS terminal 500 is fixed to the gas tank 400, and the structure is stable.

[0051] Reference Figure 1 and Figure 2 As shown, in some embodiments of this utility model, the GIS terminal 500 further includes a cone support assembly, which is sleeved on the stress cone 510 and connected to the epoxy sleeve 520. The cone support assembly is used to support the stress cone 510, and the interface pressure between the stress cone 510 and the cable 600 can be adjusted by adjusting the supporting force of the cone support assembly on the stress cone 510. In some specific embodiments, the cone support assembly includes a cone support 540 and a spring mechanism 550. The cone support 540 is sleeved on the stress cone 510 to abut against the stress cone 510. The spring mechanism 550 is connected to the epoxy sleeve 520 and applies an elastic force to the cone support 540 to support the stress cone 510. It is understood that the preload of the spring mechanism 550 can be adjusted. By adjusting the degree of spring extension, the elastic pressure on the cone support 540 can be adjusted. The elastic pressure provided by the spring mechanism 550 can stably and reliably fix the stress cone 510 to the cable 600. At the same time, the elastic pressure of the spring mechanism 550 can also make the outer wall of the stress cone 510 press against the inner wall of the epoxy sleeve 520. In addition, the stress cone 510 and the cable 600 adopt an interference fit sleeve form, and the interface between the stress cone 510 and the cable 600 and the joint surface between the stress cone 510 and the epoxy sleeve 520 can withstand a large interface field strength.

[0052] Reference Figure 1 and Figure 2 As shown, in some embodiments of this utility model, one end of the epoxy sleeve 520 is connected to a tail tube 560, the tail tube 560 is sleeved on the cable 600, and the cone support assembly is located inside the tail tube 560. The tail tube 560 is provided to protect the internal structure of the cable 600 and the GIS terminal 500.

[0053] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0054] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A transfer terminal for a 220kV overhead transmission line, characterized in that, include: Upper flange, with a cable outlet fitting provided on one side of the upper flange, the cable outlet fitting being used to connect overhead lines; Insulating sleeve, fixedly connected to the upper flange; A connecting rod is located inside the insulating sleeve. One end of the connecting rod is connected to the outgoing hardware, and the other end is provided with a first plug-in structure. A gas cylinder is connected to the end of the insulating sleeve away from the upper flange and communicates with the insulating sleeve. The end of the gas cylinder away from the upper flange is provided with an installation port. The GIS terminal includes a stress cone and an epoxy sleeve. The stress cone is sleeved on the cable and located inside the gas tank. The epoxy sleeve is sleeved on the stress cone and is detachably connected to the gas tank and seals the installation port. One end of the epoxy sleeve facing the connecting rod is provided with a terminal post. One end of the terminal post is provided with a second plug-in structure, and the other end is connected to a conductor inside the cable. The second plug-in structure is plugged into and cooperates with the first plug-in structure. The gas cylinder and the insulating sleeve are filled with insulating gas.

2. The transfer terminal for 220kV overhead transmission lines according to claim 1, characterized in that: The insulating gas is SF6 gas.

3. The transfer terminal for 220kV overhead transmission lines according to claim 1, characterized in that: The insulating sleeve includes an inner layer and an outer layer disposed on the outer surface of the inner layer. The inner layer is made of fiberglass, and the outer layer is made of silicone rubber.

4. The transfer terminal for 220kV overhead transmission lines according to claim 1, characterized in that: A shielding cylinder is provided on the inner side of the insulating sleeve near the gas tank, and the shielding cylinder is distributed around the connecting rod.

5. The transfer terminal for 220kV overhead transmission lines according to claim 1, characterized in that: The gas tank is equipped with a pressure gauge and a vent valve.

6. The transfer terminal for 220kV overhead transmission lines according to claim 1, characterized in that: The first plug-in structure includes multiple plugs, and the second plug-in structure includes multiple plug interfaces. The plugs and plug interfaces correspond one-to-one and are plugged in and mated.

7. The transfer terminal for 220kV overhead transmission lines according to claim 6, characterized in that: It also includes a lower flange, which is fixedly connected to the gas tank by fasteners. The epoxy sleeve has an annular flange on the outside of the gas tank, and the annular flange is sandwiched between the lower flange and the gas tank.

8. The transfer terminal for 220kV overhead transmission lines according to claim 1, characterized in that: The GIS terminal also includes a cone support assembly, which is sleeved on the stress cone and connected to the epoxy sleeve. The cone support assembly is used to support the stress cone.

9. The transfer terminal for 220kV overhead transmission lines according to claim 8, characterized in that: The cone support assembly includes a cone support and a spring mechanism. The cone support is sleeved on the stress cone to abut against the stress cone. The spring mechanism is connected to the epoxy sleeve and is used to apply an elastic force to the cone support to achieve the support of the cone support for the stress cone.

10. The transfer terminal for 220kV overhead transmission lines according to claim 8, characterized in that: One end of the epoxy sleeve is connected to a tail tube, which is sleeved on the cable, and the cone support assembly is located inside the tail tube.

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