Layered arrangement type transmission and distribution line transfer disconnector

Abstract

The utility model relates to a layered arrangement type power transmission and transformation line transfer disconnecting switch, and relates to the technical field of disconnecting switch, and is used for solving the problem that the existing 72.5kV line transfer disconnecting switch occupies large area. Including conducting unit and transmission rod, conducting unit has three layers and sets gradually from top to bottom, and conducting unit includes chassis, rotating insulator, fixed insulator, contact side conducting pipe, contact finger side conducting pipe and drive mechanism, the rotating insulator of three rotating insulators rotatingly connected with chassis is arranged around fixed insulator, and three contact finger side conducting pipes are hingedly connected to the top of fixed insulator, one contact side conducting pipe is fixedly connected to the top of each rotating insulator, the drive mechanism is used for driving the rotation of rotating insulator, and when contact side conducting pipe and contact finger side conducting pipe are collinear, closing is realized, and when contact side conducting pipe and contact finger side conducting pipe are separated, opening is realized. The utility model solves the problem that the conventional multipolar 72.5kV line transfer disconnecting switch product occupies large area.

Description

Technical Field

[0001] This utility model relates to the field of disconnecting switch technology, specifically a layered transmission and transformation line transfer disconnecting switch. Background Technology

[0002] 72.5kV line transfer disconnect switches play a crucial role in the entire power transmission and transformation system, and are widely used in various substations, railway systems, and wind power generation systems. Existing 72.5kV disconnect switches have advantages such as high voltage carrying capacity, stable conductivity, simple structure, high reliability, and ease of maintenance, and can meet most power supply needs. However, in practical use, the following drawbacks exist: First, this type of switch does not have a line-switching function, and can only perform conventional opening and closing operations. Second, the footprint of this type of switch usually increases with the number of poles, resulting in low space utilization. Finally, the installation and commissioning of existing 72.5kV line transfer disconnect switches requires ensuring the synchronous conduction of each pole, making the commissioning process time-consuming and challenging. Utility Model Content

[0003] The purpose of this utility model is to provide a layered arrangement of transmission and transformation line transfer disconnect switches to solve the problem of large footprint of existing 72.5kV line transfer disconnect switches.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a layered transmission and transformation line switching disconnector, including a conductive unit and a transmission rod. The conductive unit has three layers arranged sequentially from top to bottom. The conductive unit includes a base frame, a rotating insulator, a fixed insulator, a contact-side conductive tube, a finger-side conductive tube, and a drive mechanism. The fixed insulator is fixed vertically on the base frame. Around the fixed insulator are three vertically arranged rotating insulators rotatably connected to the base frame. The top of the fixed insulator is hinged to three finger-side conductive tubes, and a return spring is provided between them. The top of each rotating insulator is fixedly connected to a contact-side conductive tube. When the return spring is at its natural length, the finger-side conductive tube is in the open position. The drive mechanism is used to drive the rotation of the rotating insulator. When the contact-side conductive tube and the finger-side conductive tube are collinear, the circuit is closed. When the contact-side conductive tube and the finger-side conductive tube are separated, the circuit is opened. The drive mechanisms of the three conductive units operate synchronously. The three rotating insulators of the conductive unit operate individually or simultaneously.

[0005] Furthermore, the driving mechanism includes a transmission crank arm and a connecting rod. The first end of the transmission crank arm is rotatably connected to the base frame, and the second end of the transmission crank arm is hinged to the first end of the connecting rod. The second end of the connecting rod is hinged to the bottom rod of the insulator at the bottom of the rotating insulator. The transmission crank arms of the three conductive units move synchronously. When the transmission crank arm rotates, it pushes and pulls the bottom rod of the insulator and the rotation of the rotating insulator through the connecting rod.

[0006] Furthermore, the transmission crank arm is rotatably connected to the base frame via a crank arm shaft, and the crank arm shafts in every two adjacent conductive units are fixedly connected via a transmission rod to achieve synchronous movement. The crank arm shaft in the lowest conductive unit is connected to the operating mechanism via a transmission rod.

[0007] Furthermore, the upper end of the transmission rod is fixedly connected to the crank arm shaft in the upper conductive unit via a coupling, and the lower end of the transmission rod is fixedly connected to the crank arm shaft in the lower conductive unit via a clamping plate.

[0008] Furthermore, a support plate is fixed to the top of the fixed insulator, the first end of the contact finger-side conductive tube is rotatably connected to the support plate, and the second end of the contact finger-side conductive tube has a contact finger; the first end of the contact-side conductive tube is fixedly connected to the rotating insulator, and the second end of the contact-side conductive tube has a contact.

[0009] Furthermore, the support plate has a top plate above it and the two are fixedly connected by a support rod. The first end of the reset spring is fixedly connected to the top plate, and the second end of the reset spring is fixedly connected to the conductive tube on the finger side.

[0010] Furthermore, the top plate has a first rain cover above it.

[0011] Furthermore, the support plate has three limiting blocks, each corresponding to one of the three finger-side conductive tubes, and the limiting blocks are used to restrict the displacement of the corresponding finger-side conductive tubes.

[0012] Furthermore, the first end of the contact-side conductive tube has a terminal block.

[0013] Furthermore, the first end of the contact-side conductive tube has a second rain cover.

[0014] The beneficial effects of this utility model are: (1) This utility model solves the problem of large footprint of conventional multi-pole 72.5kV disconnector products: by vertically installing the conductive unit, the space utilization rate is greatly improved, the overall structure is simpler, and the reliability is higher. (2) The synchronous adjustment of the conductive unit of this utility model is more convenient: each phase of the conductive unit and the drive mechanism are independently connected, and each contact side conductive tube can be adjusted individually without being affected by other contact side conductive tubes. The synchronous adjustment of the conductive unit is more convenient and simple. (3) This utility model adds a line-changing function to the disconnector: the three contact side conductive tubes are combined with one contact finger side conductive tube. During normal power transmission and transformation, only the two contact side conductive tubes and the contact finger side conductive tube of the main line are closed, and the standby line is connected to the remaining contact side conductive tubes and kept open; when line changing is required, one of the contact side conductive tubes of the main line is disconnected, and the contact side conductive tube of the standby line is closed with the contact finger side conductive tube, thereby completing the line changing. Attached Figure Description

[0015] Figure 1 This is the front view of the present invention; Figure 2 This is a front view of each conductive unit of this utility model; Figure 3 This is a right view of each conductive unit of this utility model; Figure 4 This is a top view of each conductive unit of this utility model; Figure 5 This is a three-dimensional view of the three-phase conductive components of this utility model when all circuits are closed. Figure 6 This is the main assembly view of the rotating insulator, the contact-side conductive tube, and the rain cover of this utility model; Figure 7 This is a top view of the contact-side conductive tube and support plate in the closed state of this utility model. Figure 8 This is a top view of the contact finger-side conductive tube and support plate in the open state of this utility model. Figure 9 This is a top view of each conductive unit in the open state of this utility model; Figure 10 This is a left-side assembly view of each conductive unit and transmission rod of this utility model; In the diagram: 1. Base frame, 2. Bearing seat, 3. Rotary insulator, 3'. Fixed insulator, 31. Insulator base rod, 4. Transmission crank arm, 41. Crank arm shaft, 5. First connecting rod, 6. Clamping plate, 7. Transmission rod, 8. Phase A contact side conductive tube, 81. Terminal plate, 82. Contact, 9. Phase B contact side conductive tube, 10. Rotating shaft, 11. Phase C contact side conductive tube, 12. Second connecting rod, 13. Base frame fixing rod, 14. First rain cover, 15. Contact finger side conductive tube, 16. Limiting block, 17. Support plate, 18. Contact finger, 19. Top plate, 20. Support rod, 21. Second rain cover, 22. Reset spring. Detailed Implementation

[0016] like Figures 1 to 10 As shown, this utility model includes a conductive unit and a transmission rod 7. The conductive unit consists of three layers arranged in an upper, middle, and lower configuration, and the three layers of conductive units are connected by the transmission rod 7 to achieve synchronous operation. The structure and working principle of this utility model will be described in detail below with reference to the accompanying drawings.

[0017] like Figure 1 As shown, a layered transmission line transfer disconnector includes conductive units and a transmission rod 7. The conductive units have three layers arranged sequentially from top to bottom, and the three layers of conductive units have identical structures. Figures 2 to 5 As shown, the conductive unit includes a base frame 1, a rotating insulator 3, a fixed insulator 3', a contact-side conductive tube, a finger-side conductive tube 15, and a drive mechanism. The base frame 1 is welded from profiles and often adopts a triangular structure to increase overall stability. The base frame 1 has a base frame fixing rod 13, which is directly fixed to the mounting foundation, thus achieving a fixed connection between the base frame 1 and the mounting foundation. A vertically arranged fixed insulator 3' is fixed on the base frame 1. Around the fixed insulator 3' are three vertically arranged rotating insulators 3, forming an equilateral triangle. The fixed insulator 3' is located at the center of the triangle formed by the three rotating insulators 3. The bottom of the rotating insulator 3 is rotatably connected to the base frame 1 via a bearing seat 2, allowing the three rotating insulators 3 to rotate relative to the base frame 1. Three finger-side conductive tubes 15 are hinged to the top of the fixed insulator 3', and a return spring 22 is provided between the fixed insulator 3' and the finger-side conductive tubes 15. Specifically, as shown... Figure 6 As shown, a support plate 17 is bolted to the top of the fixed insulator 3'. The first end of the contact-side conductive tube 15 is rotatably connected to the support plate 17 via a rotating shaft 10, allowing a bearing to be fixed on the support plate 17. The outer ring of the bearing is bolted to the support plate 17. The lower end of the rotating shaft 10 extends into the inner ring of the bearing and is fixedly connected to it. The upper end of the rotating shaft 10 passes through the contact-side conductive tube 15 and is fixedly connected to it. A top plate 19 is located above the support plate 17, and the two are fixedly connected by a support rod 20. Figure 7 , Figure 8As shown, the top plate 19 has a triangular structure, with rounded corners at the included angles. The first end of the reset spring 22 is fixedly connected to the top plate 19, and the second end of the reset spring 22 is fixedly connected to the first end of the contact finger-side conductive tube 15. Figure 8 As shown, when the reset spring 22 is at its natural length, the contact-side conductive tube 15 is in the open position. Specifically, the top plate 19 is designed as an equilateral triangle structure, the support plate 17 is designed as a circular structure, and the rotating shafts 10 are equally spaced on the same circumference relative to the support plate 17. The three rotating shafts 10 correspond one-to-one with the three corners of the top plate 19, and the rotating shafts 10 and the corresponding corners of the top plate 19 are in the same radial direction of the support plate 17. The support plate 17 is fixed with three limiting blocks 16 by bolts. The three limiting blocks 16 correspond one-to-one with the three contact-side conductive tubes 15, and the limiting blocks 16 are used to limit the displacement of the corresponding contact-side conductive tubes 15.

[0018] like Figure 5 As shown, each rotating insulator 3 has a contact-side conductive tube fixedly connected to its top. The three rotating insulators 3 are located at phase A, phase B, and phase C, respectively. The contact-side conductive tube at the top of the rotating insulator 3 at phase A is phase A contact-side conductive tube 8, the contact-side conductive tube at the top of the rotating insulator 3 at phase B is phase B contact-side conductive tube 9, and the contact-side conductive tube at the top of the rotating insulator 3 at phase C is phase C contact-side conductive tube 11. The phase A contact-side conductive tube 8, phase B contact-side conductive tube 9, and phase C contact-side conductive tube 11 have the same structure and shape; the difference lies in their different positions. The first end of phase A contact-side conductive tube 8, the first end of phase B contact-side conductive tube 9, and the first end of phase C contact-side conductive tube 11 are fixedly connected to the top of the corresponding rotating insulator 3.

[0019] like Figure 9 , Figure 10As shown, the drive mechanism is located on the base frame 1 and is used to drive the rotation of the rotating insulator 3. The drive mechanism includes a transmission crank arm 4 and a connecting rod. The first end of the transmission crank arm 4 is rotatably connected to the base frame 1, the second end of the transmission crank arm 4 is hinged to the first end of the connecting rod, and the second end of the connecting rod is hinged to the insulator base rod 31 at the bottom of the rotating insulator 3. The transmission crank arms 4 of the three conductive units move synchronously. When the transmission crank arm 4 rotates, it pushes and pulls the insulator base rod 31 and the rotating insulator 3 through the connecting rod. Specifically, each conductive unit has three drive mechanisms, and the three drive mechanisms correspond one-to-one with the three rotating insulators 3. The first end of the transmission crank arm 4 is fixed with a crank arm shaft 41, which is directly rotatably connected to the base frame 1 to realize the rotatable connection between the transmission crank arm 4 and the base frame 1. The first end of the insulator base rod 31 is fixedly connected to the lower part of the rotating insulator 3 through a flange, and the second end of the insulator base rod 31 extends radially outward along the rotating insulator 3. The second end of the insulator base rod 31 at the bottom of the rotating insulator 3, which houses the conductive tube 8 on the A-phase contact side, is hinged to the second end of the corresponding crank arm 4 via the first connecting rod 5. Similarly, the second end of the insulator base rod 31 at the bottom of the rotating insulator 3, which houses the conductive tube 9 on the B-phase contact side, is also hinged to the second end of the corresponding crank arm 4 via the first connecting rod 5. The second end of the insulator base rod 31 at the bottom of the rotating insulator 3, which houses the conductive tube 11 on the C-phase contact side, is hinged to the second end of the corresponding crank arm 4 via the second connecting rod 12. Figure 4 As shown, three crank arms 4 are positioned on the same side of the triangle formed by the three rotating insulators 3. The distances of the three crank arms 4 from the corresponding rotating insulators 3 are different. Therefore, the only difference between the first connecting rod 5 and the second connecting rod 12 is their length. When the crank arm shaft 41 rotates, it drives the crank arms 4 to rotate, which in turn pushes or pulls the insulator base rod 31 through the corresponding first connecting rod 5 or second connecting rod 12, thereby pushing or pulling the rotation of the corresponding rotating insulator 3.

[0020] To achieve synchronous rotation of the rotating insulators 3 in each conductive unit, the crank arm shafts 41 of every two adjacent conductive units are fixedly connected by a transmission rod 7 to achieve synchronous operation. The crank arm shaft 41 in the lowest conductive unit is connected to the operating mechanism via the transmission rod 7. Figure 10 As shown, for the transmission rod 7 between two adjacent conductive units, the upper end of the transmission rod 7 is fixedly connected to the crank arm shaft 41 in the upper conductive unit via a coupling, and the lower end of the transmission rod 7 is fixedly connected to the crank arm shaft 41 in the lower conductive unit via a clamping plate 6. The lower end of the transmission rod 7 extends between the two paired clamping plates 6, and the two clamping plates 6 are fixedly connected by bolts.

[0021] To achieve conductivity when the contact-side conductive tube 15 and the contact-side conductive tube are in contact, a contact finger 18 is provided inside the second end of the contact-side conductive tube 15. The first end of the A-phase contact-side conductive tube 8, the first end of the B-phase contact-side conductive tube 9, and the first end of the C-phase contact-side conductive tube 11 all have contacts 82. When the contacts 82 are in contact with the contact finger 18, conductivity is achieved.

[0022] To achieve protection for components, such as Figure 6 As shown, a first rain cover 14 is provided above the top plate 19, and the first rain cover 14 is fixedly connected to the top plate 19. The first rain cover 14 is provided to prevent rainwater from eroding the reset spring 22 and the rotating shaft 10. A second rain cover 21 is provided at the first end of each of the three contact-side conductive tubes; specifically, a louvered second rain cover 21 is provided inside the first end of the A-phase contact-side conductive tube 8, the B-phase contact-side conductive tube 9, and the C-phase contact-side conductive tube 11. The second rain cover 21 does not affect the heat dissipation of each contact-side conductive tube, but it prevents rainwater from entering the inside of the contact-side conductive tubes.

[0023] To facilitate wiring, a terminal block 81 is fixed to the first end of the conductive tube on each contact side by bolts. The terminal block 81 facilitates the wiring between the conductive tube on each contact side and the circuit.

[0024] The working principle of this utility model is described in detail below: (1) When the contact-side conductive tube and the finger-side conductive tube 15 are collinear, the circuit is closed; when the contact-side conductive tube and the finger-side conductive tube 15 are separated, the circuit is opened. (2) In the closed position, two of the three phases, such as phase A and phase C, or phase B and phase C, are in contact with the finger-side conductive tube 15. At this time, the finger-side conductive tube 15 is collinear with the corresponding contact-side conductive tube, and the contact 21 is in close contact with the finger 18. The main conductive circuit at this time is: external lead-connecting plate 81-contact-side conductive tube-contact 21-finger 18-finger-side conductive tube 15-support plate 17-external lead. (3) When the circuit breaker starts to open, the transmission rod 7 rotates counterclockwise, causing the transmission cranks 4 of all conductive units to rotate counterclockwise. When the transmission cranks 4 rotate, they drive the rotating insulators 3 to rotate together through the first connecting rod 5 and the second connecting rod 12, thereby driving the A-phase contact side conductive tube 8, the B-phase contact side conductive tube 9, and the C-phase contact side conductive tube 11 to rotate towards the opening position. Among them, the A-phase contact side conductive tube 8 rotates 90° clockwise, and the B-phase contact side conductive tube 9 and the C-phase contact side conductive tube 11 rotate 90° counterclockwise. When the circuit breaker is opened, the contact finger side conductive tube 15 rotates together with the A-phase contact side conductive tube 8, the B-phase contact side conductive tube 9, and the C-phase contact side conductive tube 11 in the opening direction under the action of the reset spring 22, until it touches the limit block 16 and stops rotating. At this time, the opening action is completed. (4) When the circuit breaker begins to close, the transmission rod 7 starts to rotate clockwise, driving the transmission crank arm 4 to rotate clockwise. When the transmission crank arm 4 rotates, it drives the rotating insulator 3 to rotate together through the first connecting rod 5 and the second connecting rod 12, thereby driving the A-phase contact side conductive tube 8, the B-phase contact side conductive tube 9, and the C-phase contact side conductive tube 11 on the rotating insulator 3 to rotate towards the closing position. Among them, the A-phase contact side conductive tube 8 rotates 90° counterclockwise, and the B-phase contact side conductive tube 9 and the C-phase contact side conductive tube 11 rotate 90° clockwise. Under the action of the contact 82, the contact finger side conductive tube 15 rotates together along the closing direction of the A-phase contact side conductive tube 8, the B-phase contact side conductive tube 9, and the C-phase contact side conductive tube 11 until the contact finger side conductive tube 15 and the corresponding contact side conductive tube are collinear and remain collinear. At this time, the closing action is completed, and the transmission rod 7 stops rotating. (5) The opening sequence of this utility model: the transmission rod rotates - the transmission crank arm rotates - the rotating insulator rotates - the contact side conductive tube and the contact finger side conductive tube rotate in the same direction to open - the opening is in place. (6) The closing sequence of this utility model: the transmission rod rotates - the transmission crank arm rotates - the rotating insulator rotates - the contact side conductive tube drives the contact finger side conductive tube to rotate in the same direction to close - the closing is in place. (7) The crank arm shaft 41 of the three-layer conductive unit achieves synchronous operation through the transmission rod 7, and the three rotating insulators 3 of the conductive unit can operate individually or simultaneously.(8) When a substation needs to maintain part of the transmission line but cannot disconnect the entire line for an extended period, the disconnecting switch of this utility model can be used. The operating mechanism transmits torque to the transmission rod 7, thereby switching the disconnecting switch from a closed state (A-phase contact side conductive tube 8, C-phase contact side conductive tube 11, and contact finger side conductive tube 15) to a closed state (B-phase contact side conductive tube 9, C-phase contact side conductive tube 11, and contact finger side conductive tube 15), or to a state where all three phases (A-phase contact side conductive tube 8, B-phase contact side conductive tube 9, C-phase contact side conductive tube 11, and contact finger side conductive tube 15) are open. After switching from A and C phases closed to B and C phases closed, the transmission line is switched, allowing maintenance of phase A. After switching from A and C phases closed to A, B, and C phases open, the entire A, B, and C line is disconnected, allowing maintenance of the entire A, B, and C line.

[0025] This invention solves the problem of large footprint in conventional multi-pole 72.5kV line transfer disconnectors: by vertically installing the conductive units, space utilization is greatly improved, the overall structure is simpler, and reliability is higher. Synchronous adjustment of the conductive units is more convenient: each phase of the conductive unit is independently connected to the drive mechanism, and each contact-side conductive tube can be adjusted individually, unaffected by other contact-side conductive tubes, making synchronous adjustment of the conductive units more convenient and simple. This invention adds a line-changing function to the disconnector: three contact-side conductive tubes are combined with one contact-finger-side conductive tube. During normal power transmission, only the two contact-side conductive tubes and the contact-finger-side conductive tube of the main line are closed, while the standby line is connected to the remaining contact-side conductive tubes and kept open; when line changing is required, one of the contact-side conductive tubes of the main line is disconnected, and the contact-side conductive tube and the contact-finger-side conductive tube of the standby line are closed, thus completing the line change.

Claims

1. A layered transmission line transfer disconnector, comprising a conductive unit and a transmission rod, characterized in that, The conductive unit has three layers arranged sequentially from top to bottom. Each conductive unit includes a base frame, rotating insulators, fixed insulators, contact-side conductive tubes, finger-side conductive tubes, and a drive mechanism. The base frame has vertically arranged fixed insulators. Around each fixed insulator are three vertically arranged rotating insulators rotatably connected to the base frame. The top of each fixed insulator is hinged to three finger-side conductive tubes, with a return spring between them. Each rotating insulator has a contact-side conductive tube fixedly connected to its top. When the return spring is at its natural length, the finger-side conductive tube is in the open position. The drive mechanism drives the rotating insulators to rotate. Closing is achieved when the contact-side conductive tube and the finger-side conductive tube are collinear, and opening is achieved when they are separated. The drive mechanisms of the three conductive units operate synchronously, and the three rotating insulators of each conductive unit can operate individually or simultaneously.

2. The layered arrangement transmission and transformation line transfer disconnector according to claim 1, characterized in that, The drive mechanism includes a transmission crank arm and a connecting rod. The first end of the transmission crank arm is rotatably connected to the base frame, and the second end of the transmission crank arm is hinged to the first end of the connecting rod. The second end of the connecting rod is hinged to the bottom rod of the insulator at the bottom of the rotating insulator. The transmission crank arms of the three conductive units move synchronously. When the transmission crank arm rotates, it pushes and pulls the bottom rod of the insulator and the rotation of the rotating insulator through the connecting rod.

3. A layered transmission and transformation line transfer disconnector according to claim 2, characterized in that, The transmission crank arm is rotatably connected to the base frame via a crank arm shaft. The crank arm shafts in every two adjacent conductive units are fixedly connected via a transmission rod to achieve synchronous movement. The crank arm shaft in the lowest conductive unit is connected to the operating mechanism via a transmission rod.

4. A layered transmission and transformation line transfer disconnector according to claim 3, characterized in that, The upper end of the transmission rod is fixedly connected to the crank arm shaft in the upper conductive unit via a coupling, and the lower end of the transmission rod is fixedly connected to the crank arm shaft in the lower conductive unit via a clamping plate.

5. A layered transmission line transfer disconnector according to claim 4, characterized in that, A support plate is fixed to the top of the fixed insulator. The first end of the contact finger-side conductive tube is rotatably connected to the support plate, and the second end of the contact finger-side conductive tube has a contact finger. The first end of the contact head-side conductive tube is fixedly connected to the rotating insulator, and the second end of the contact head-side conductive tube has a contact.

6. A layered transmission line transfer disconnector according to claim 5, characterized in that, The support plate has a top plate above it and the two are fixedly connected by a support rod. The first end of the reset spring is fixedly connected to the top plate, and the second end of the reset spring is fixedly connected to the conductive tube on the finger side.

7. A layered transmission line transfer disconnector according to claim 6, characterized in that, The top plate has a first rain cover.

8. A layered transmission and transformation line transfer disconnector according to claim 7, characterized in that, The support plate has three limiting blocks, each corresponding to one of the three finger-side conductive tubes. The limiting blocks are used to restrict the displacement of the corresponding finger-side conductive tubes.

9. A layered transmission line transfer disconnector according to claim 8, characterized in that, The first end of the conductive tube on the contact side has a terminal block.

10. A layered transmission line transfer disconnector according to claim 9, characterized in that, The first end of the conductive tube on the contact side has a second rain cover.

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