A quick grounding device applied to high and low voltage winding of dry-type transformer

Abstract

The utility model discloses a dry -type transformer high, low voltage side winding quick grounding device, solve traditional manual grounding operation efficiency low, connection is not stable and the problem of potential safety hazard. The device includes the lifting seat of vertical sliding in the top of transformer shell, is equipped with the clamping body of corresponding high, low voltage terminal on it, and the clamping body connects the ground wire and is connected in series AC power supply, circuit breaker etc. There is the motor and screw rod of driving lifting seat in the shell, and the guide column ensures the stable lifting, and the connecting frame makes the clamping body accurate butt joint terminal, and the clamping body arc groove adapts the outside diameter of terminal. Infrared sensor cooperates with reflector, and the clamping body contact position is accurately controlled. The ground wire is connected through the wire wheel and the tensioning structure, and keeps tension through the movable pulley and spring. The device can automatically complete high, low voltage side winding grounding fast, and the operation is convenient, and the connection is reliable, avoids the hidden danger of manual operation, and improves the grounding efficiency and safety.

Description

Technical Field

[0001] This utility model relates to the field of grounding device technology, and in particular to a fast grounding device for the high and low voltage side windings of a dry-type transformer. Background Technology

[0002] In power systems, dry-type transformers are common voltage transformation devices. To ensure their proper operation, regular inspections and maintenance are required. After power outages, maintenance personnel must connect the high- and low-voltage windings to the earth using grounding wires to ensure reliable grounding during maintenance. The traditional grounding method involves manually connecting the high- and low-voltage windings to the grounding point using grounding wires to achieve equipotentiality with the earth. However, suspending the grounding wire inside the dry-type transformer enclosure is inconvenient due to the limited space, resulting in low efficiency, unstable grounding wire suspension, and safety hazards. Summary of the Invention

[0003] The technical problem to be solved by this utility model is that when maintaining dry-type transformers, the limited space not only results in low operating efficiency and unstable connection, but also poses safety hazards.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a fast grounding device for the high and low voltage windings of a dry-type transformer, including a lifting seat vertically slidingly arranged on the top of the transformer shell, clamps corresponding to the high voltage terminal and the low voltage terminal respectively on the lifting seat, the clamps being connected to grounding wires, and the lifting seat, AC power supply, circuit breaker and status indication unit being connected in series on the grounding wire, and a moving drive component for the lifting seat and a tensioning structure for the grounding wire being provided inside the transformer shell.

[0005] Preferably, a mounting base is fixedly provided on the inner side wall of the transformer housing, the moving drive component is a drive motor fixed on the mounting base, the drive motor is driven by a vertically arranged screw, the lifting seat is threadedly connected to the screw, and a guide structure for the vertical movement of the lifting seat is provided inside the transformer housing.

[0006] Preferably, the guide structure includes a guide column vertically fixed to the inner wall of the transformer housing, the lifting seat being vertically slidably connected to the guide column, and the guide column and the screw being respectively connected to both ends of the lifting seat.

[0007] Preferably, the bottom of the lifting seat is fixedly connected to a connecting frame, the bottom end of the connecting frame is forked, and clamps corresponding to the high-voltage terminal and the low-voltage terminal are fixedly connected to each other respectively.

[0008] Preferably, the connecting frame includes a vertical rod connected to the lifting seat, a horizontal rod fixed to the vertical rod, and a connecting rod connected to both ends of the horizontal rod. The clamp is fixed to the bottom end of the connecting rod, and the bottom of the horizontal rod is fixedly connected to the connecting rod by vertically arranged stiffeners.

[0009] Preferably, the bottom of the clamp is provided with an arc-shaped slot, and the inner diameter of the arc-shaped slot of the clamp is equal to the outer diameter of the corresponding high-voltage terminal or low-voltage terminal.

[0010] Preferably, an infrared sensor is horizontally arranged on the inner wall of the transformer housing, and a reflector is provided on the lifting seat, with the infrared sensor facing the reflector when the clamp is connected to the corresponding high-voltage terminal or low-voltage terminal.

[0011] Preferably, a guide wheel is fixedly installed on the inner side wall of the transformer housing, the grounding wire passes through the guide wheel, and the guide wheel is distributed along the axial extension line of the lifting seat.

[0012] Preferably, the tensioning structure includes a vertical plate arranged inside the transformer housing, with a first groove and a second groove vertically formed on the vertical plate. The first groove is located below the second groove at an offset position. A first movable pulley and a second movable pulley are slidably arranged in the first groove and the second groove, respectively. The grounding wire is S-shaped and passes around the first movable pulley and the second movable pulley. A spring is provided in the second groove, and the spring connects the bottom of the second groove and the second movable pulley.

[0013] Preferably, the tensioning structure includes a vertical plate arranged inside the transformer housing, a third sliding groove is horizontally opened on the vertical plate, a third movable pulley is horizontally slidably arranged in the third sliding groove, fixed pulleys are arranged above and below one end of the third sliding groove, a spring is arranged in the third sliding groove to push the third movable pulley to the other end of the third sliding groove, and the grounding wire is triangular in shape and passes around the two fixed pulleys and the third movable pulley.

[0014] This invention provides a fast grounding device for the high and low voltage windings of a dry-type transformer, which has the following beneficial effects.

[0015] 1. The lifting seat is driven to move vertically by the moving drive component. When grounding is required, the lifting seat is controlled to descend, causing the frame to descend. The frame is then connected to the high-voltage terminal and the low-voltage terminal respectively, realizing the connection of the grounding wire to the high-voltage terminal and the low-voltage terminal, and finally realizing the rapid grounding of the high-voltage and low-voltage windings of the dry-type transformer.

[0016] 2. Install a tensioning structure inside the transformer casing, and connect the grounding wire to the tensioning structure. During the vertical movement of the lifting seat, the tensioning structure ensures that the grounding wire is in a taut state, preventing the grounding wire from loosening and getting caught on the transformer, thus ensuring the safety and stability of the grounding device operation.

[0017] 3. Install an infrared sensor inside the transformer casing. When the clamp contacts the high-voltage or low-voltage terminal, the infrared sensor receives a signal. At this time, the moving drive stops driving the lifting seat to move. This ensures the accuracy of the clamp's contact while avoiding excessive downward pressure that could damage the high-voltage or low-voltage terminal. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model.

[0020] Figure 2 This is a schematic diagram of the lifting seat in an embodiment of the present utility model.

[0021] Figure 3 This is yet another embodiment of the tensioning structure in the present invention.

[0022] In the diagram: 1. Transformer casing; 2. High-voltage terminal; 3. Low-voltage terminal; 4. Grounding terminal; 5. Grounding wire; 6. Status indicator unit; 7. Circuit breaker; 8. AC power supply; 9. Lifting seat; 10. Guide column; 11. Screw; 12. Mounting base; 13. Drive motor; 14. Connecting frame; 15. Clamp; 16. Guide wheel; 17. Infrared sensor; 18. Reflector; 19. First movable pulley; 20. First slide groove; 21. Second movable pulley; 22. Second slide groove; 23. Third movable pulley; 24. Third slide groove; 25. Fixed pulley. Detailed Implementation

[0023] like Figure 1-3 As shown, this utility model provides a fast grounding device for the high and low voltage windings of a dry-type transformer, including a lifting seat 9 vertically slidingly arranged on the top of the transformer housing 1. The lifting seat 9 is respectively provided with clamps 15 corresponding to the high voltage terminal 2 and the low voltage terminal 3. The clamps 15 are connected to grounding wires 5. The lifting seat 9, AC power supply 8, circuit breaker 7 and status indication unit 6 are connected in series on the grounding wires 5. The transformer housing 1 is provided with a moving drive for the lifting seat 9 and a tensioning structure for the grounding wires 5.

[0024] When a dry-type transformer needs to be inspected or maintained regularly, the maintenance personnel will de-energize it, connect the AC power supply 8, close the circuit breaker 7, and the status indicator unit 6 will show that the grounding device of the dry-type transformer is open. After remotely or locally issuing a command to start the drive motor 13, the drive motor 13 will drive the lifting seat 9 to move downwards. The lifting seat 9 will drive the clamp 15 to move downwards, and the clamp 15 will make stable contact with the corresponding high-voltage terminal 2 or low-voltage terminal 3. The high-voltage terminal 2 and low-voltage terminal 3 will achieve rapid grounding of the high-voltage and low-voltage windings of the dry-type transformer through the grounding wire 5 in the lifting seat 9. At this time, the status indicator unit 6 will show that the grounding device of the dry-type transformer is closed, and the high-voltage and low-voltage windings are connected to the earth and other units, so that the subsequent inspection or maintenance work of the dry-type transformer can be carried out.

[0025] like Figure 1 To achieve the vertical movement of the lifting seat 9, a mounting base 12 is fixedly installed on the inner wall of the transformer housing 1. The moving drive component is a drive motor 13 fixed on the mounting base 12. The drive motor 13 is driven by a vertically arranged screw 11. The lifting seat 9 is threadedly connected to the screw 11. A guide structure for the vertical movement of the lifting seat 9 is provided inside the transformer housing 1. The vertical movement of the lifting seat 9 is guided by the guide structure. During the rotation of the screw 11 driven by the drive motor 13, the screw 11 drives the lifting seat 9 to move in the vertical direction, which in turn drives the clamp 15 on the lifting seat 9 to move in the vertical direction.

[0026] like Figure 1 As shown, to achieve vertical guidance of the lifting seat 9, the guiding structure includes a guide post 10 vertically fixed to the inner wall of the transformer housing 1. The lifting seat 9 is vertically slidably connected to the guide post 10. The guide post 10 and the screw 11 are respectively connected to the two ends of the lifting seat 9. The guide post 10 is fixed to the inner top of the transformer 1. A sleeve is provided on the lifting seat 9, which cooperates with the guide post 10 to reduce friction. The dual action of the guide post 10 and the screw 11 on the lifting seat 9 ensures that the lifting seat 9 can only move in the vertical direction.

[0027] like Figure 1 and Figure 2 As shown. A connecting frame 14 is fixedly connected to the bottom of the lifting seat 9. The bottom end of the connecting frame 14 is forked, and clamps 15 corresponding to the high-voltage terminal 2 and the low-voltage terminal 3 are fixedly connected to it respectively. Two clamps 15 are fixedly connected by one connecting frame 14. Three connecting frames 14 are arranged on the lifting seat 9, and three pairs of clamps 15 are respectively connected to three pairs of high-voltage terminals 2 and low-voltage terminals 3.

[0028] like Figure 2As shown. The connecting frame 14 includes a vertical rod connected to the lifting seat 9, a horizontal rod fixed to the vertical rod, and connecting rods connected to both ends of the horizontal rod. The clamp 15 is fixed to the bottom end of the connecting rod, and the bottom of the horizontal rod is fixedly connected to the connecting rod by vertically arranged stiffeners. By arranging stiffeners at the bottom of the horizontal rod, the stiffeners can enhance the bending resistance of the horizontal rod. When the clamp 15 is tightly connected to the high-voltage terminal 2 or the low-voltage terminal 3, it can prevent the horizontal rod from bending and deforming, thus avoiding errors during subsequent use.

[0029] like Figure 2 As shown, the bottom of the clamp 15 is provided with an arc-shaped slot, and the inner diameter of the arc-shaped slot of the clamp 15 is equal to the outer diameter of the corresponding high-voltage terminal 2 or low-voltage terminal 3. By providing an arc-shaped slot at the bottom of the clamp 15, the contact area between the clamp 15 and the high-voltage terminal 2 or low-voltage terminal 3 is increased, thereby improving the effectiveness of the connection.

[0030] like Figure 1 As shown. An infrared sensor 17 is horizontally arranged on the inner wall of the transformer housing 1, and a reflector 18 is provided on the lifting seat 9. When the clamp 15 is connected to the corresponding high-voltage terminal 2 or low-voltage terminal 3, the infrared sensor 17 faces the reflector 18. The infrared sensor 17 emits horizontal infrared light. When the clamp 15 is connected to the high-voltage terminal 2 or low-voltage terminal 3, the infrared light is reflected by the reflector 18, and the infrared sensor 17 receives the signal. At this time, the signal is transmitted to the controller of the drive motor 13, stopping the drive motor 13 from driving the screw 11 to rotate.

[0031] like Figure 1 As shown, a guide wheel 16 is fixedly installed on the inner wall of the transformer housing 1. The grounding wire 5 passes through the guide wheel 16, and the guide wheels 16 are distributed along the axial extension line of the lifting seat 9. A terminal block is provided on the lifting seat 9, through which the grounding wire 5 is connected. During the vertical movement of the lifting seat 9, the grounding wire 5 will be pulled to move. By setting the guide wheel 16, the movement of the grounding wire 5 is smooth, reducing the wear of the grounding wire 5.

[0032] like Figure 1As shown. The tensioning structure includes a vertical plate arranged inside the transformer housing 1. A first sliding groove 20 and a second sliding groove 22 are vertically formed on the vertical plate. The first sliding groove 20 is located below the second sliding groove 22 at a slight misalignment. A first movable pulley 19 and a second movable pulley 21 are slidably arranged in the first sliding groove 20 and the second sliding groove 22, respectively. The grounding wire 5 is S-shaped and passes around the first movable pulley 19 and the second movable pulley 21. A spring is installed in the second sliding groove 22, connecting the bottom of the second sliding groove 22 and the second movable pulley 21. When the lifting seat 9 moves downward, it pulls the grounding wire 5. After the grounding wire 5 is pulled, it pulls the first movable pulley 19 upward along the first sliding groove 20, and simultaneously pulls the second movable pulley 21 downward along the second sliding groove 22, maintaining the grounding wire 5 in a tensioned state. When the lifting seat 9 moves upward, the first movable pulley 19 automatically resets, and the second movable pulley 21 is pushed back to its original position by the spring.

[0033] like Figure 3 As shown. The tensioning structure includes a vertical plate arranged inside the transformer housing 1. A third sliding groove 24 is horizontally opened on the vertical plate. A third movable pulley 23 is horizontally slidably arranged in the third sliding groove 24. Fixed pulleys 25 are arranged above and below one end of the third sliding groove 24. A spring is arranged in the third sliding groove 24 to push the third movable pulley 23 to the other end of the third sliding groove 24. The grounding wire 5 is triangular in shape and passes around the two fixed pulleys 25 and the third movable pulley 23. When the lifting seat 9 moves downward, the grounding wire 5 pulls the third sliding groove 24 to move and compresses the spring in the third sliding groove 24 to maintain the tension of the grounding wire 5. When the lifting seat 9 moves upward, the spring pushes the third movable pulley 23 to reset. The two fixed pulleys 25 are used to ensure the smooth movement of the grounding wire 5.

Claims

1. A fast grounding device for the high and low voltage side windings of a dry-type transformer, characterized in that: The transformer housing (1) includes a lifting seat (9) that is vertically slidably arranged at the top of the transformer housing (1). The lifting seat (9) is provided with clamps (15) corresponding to the high voltage terminal (2) and the low voltage terminal (3). The clamps (15) are connected to a grounding wire (5). The lifting seat (9), AC power supply (8), circuit breaker (7) and status indicator unit (6) are connected in series on the grounding wire (5). The transformer housing (1) is provided with a moving drive for the lifting seat (9) and a tensioning structure for the grounding wire (5).

2. The fast grounding device for high and low voltage side windings of a dry-type transformer as described in claim 1, characterized in that: The transformer housing (1) has a mounting base (12) fixedly installed on the inner side wall. The moving drive component is a drive motor (13) fixed on the mounting base (12). The drive motor (13) is connected to a vertically arranged screw (11). The lifting seat (9) is threadedly connected to the screw (11). The transformer housing (1) has a guide structure for the vertical movement of the lifting seat (9).

3. The fast grounding device for high and low voltage side windings of a dry-type transformer as described in claim 2, characterized in that: The guide structure includes a guide column (10) vertically fixed to the inner wall of the transformer housing (1), and the lifting seat (9) is vertically slidably connected to the guide column (10). The guide column (10) and the screw (11) are respectively connected to the two ends of the lifting seat (9).

4. The fast grounding device for high and low voltage side windings of a dry-type transformer as described in claim 1, characterized in that: The bottom of the lifting seat (9) is fixedly connected to a connecting frame (14). The bottom end of the connecting frame (14) is forked and fixedly connected to clamps (15) corresponding to the high voltage terminal (2) and the low voltage terminal (3).

5. The fast grounding device for high and low voltage side windings of a dry-type transformer as described in claim 4, characterized in that: The connecting frame (14) includes a vertical rod connected to the lifting seat (9), a horizontal rod fixed to the vertical rod, and a connecting rod connected to both ends of the horizontal rod. The clamp (15) is fixed to the bottom end of the connecting rod, and the bottom of the horizontal rod is fixedly connected to the connecting rod by vertically arranged stiffeners.

6. A fast grounding device for high- and low-voltage windings of a dry-type transformer as described in any one of claims 1-5, characterized in that: The bottom of the clamp (15) is provided with an arc-shaped slot, and the inner diameter of the arc-shaped slot of the clamp (15) is equal to the outer diameter of the corresponding high-voltage terminal (2) or low-voltage terminal (3).

7. The fast grounding device for high and low voltage side windings of a dry-type transformer as described in claim 1, characterized in that: An infrared sensor (17) is horizontally arranged on the inner wall of the transformer housing (1), and a reflector (18) is provided on the lifting seat (9). When the clamp (15) is connected to the corresponding high voltage terminal (2) or low voltage terminal (3), the infrared sensor (17) faces the reflector (18).

8. The fast grounding device for high and low voltage side windings of a dry-type transformer as described in claim 1, characterized in that: A guide wheel (16) is fixedly installed on the inner wall of the transformer housing (1), and the grounding wire (5) passes through the guide wheel (16). The guide wheel (16) is distributed on the axial extension line of the lifting seat (9).

9. The fast grounding device for high and low voltage side windings of a dry-type transformer as described in claim 1, characterized in that: The tensioning structure includes a vertical plate arranged inside the transformer housing (1). A first groove (20) and a second groove (22) are vertically provided on the vertical plate. The first groove (20) is located below the second groove (22) at an offset. A first movable pulley (19) and a second movable pulley (21) are slidably arranged in the first groove (20) and the second groove (22), respectively. The grounding wire (5) is S-shaped and passes around the first movable pulley (19) and the second movable pulley (21). A spring is provided in the second groove (22), and the spring connects the bottom of the second groove (22) and the second movable pulley (21).

10. The fast grounding device for high and low voltage side windings of a dry-type transformer as described in claim 1, characterized in that: The tensioning structure includes a vertical plate arranged inside the transformer housing (1), a third sliding groove (24) is horizontally opened on the vertical plate, a third movable pulley (23) is horizontally slidably arranged in the third sliding groove (24), a fixed pulley (25) is arranged above and below one end of the third sliding groove (24), a spring is arranged in the third sliding groove (24) to push the third movable pulley (23) to the other end of the third sliding groove (24), and the grounding wire (5) is triangular in shape and passes around the two fixed pulleys (25) and the third movable pulley (23).

Images