A short-circuit test device for generator-transformer unit

Abstract

This utility model relates to the field of short-circuit testing technology and discloses a generator-transformer short-circuit testing device, including a mounting base. A double-layer copper busbar is arranged on the side wall of the mounting base, with copper foil wires arranged between the double-layer copper busbars. A terminal is arranged between opposite sides of the double-layer copper busbars. A clamping assembly is arranged on the side wall of the mounting base. The clamping assembly includes a pressure plate located outside the double-layer copper busbars. A temperature sensor is arranged inside the pressure plate. A motor is fixedly connected to the side wall of the mounting base, and a gear is fixedly connected to the output end of the motor. In this utility model, by starting the motor, the gear rotates inside the mounting base. The rotation of the gear pushes the rack to move along the slide rail, which in turn moves the slider on the slide rail. The slider moves towards the double-layer copper busbars via the pressure plate, ultimately pressing the double-layer copper busbars onto the terminal, completing the connection of the short-circuit point and achieving a rapid clamping effect. This structure improves the efficiency of short-circuit point assembly and disassembly.

Description

Technical Field

[0001] This utility model relates to the field of short-circuit testing technology, and in particular to a generator-transformer unit short-circuit testing device. Background Technology

[0002] Short-circuit testing of generator-transformer units is an important means of detecting the performance and parameters of equipment such as generators and transformers in power systems. It is crucial for ensuring the safe and stable operation of power equipment and for timely detection of potential faults. During this test, the short-circuit testing device, as the core equipment, is responsible for constructing a stable short-circuit loop, and its performance directly affects the accuracy and reliability of the test data.

[0003] Currently, most commercially available generator-transformer unit short-circuit testing devices employ a bolt-fastened copper busbar connection structure. In actual operation, this structure requires workers to use specialized tools to manually tighten the bolts to secure the double-layer copper busbar to the terminals, thus establishing the short-circuit connection. The principle is that the pressure generated by tightening the bolts ensures tight contact between the copper busbar and the terminals, guaranteeing the continuity of the short-circuit circuit. Disassembly also requires manually loosening the bolts to remove the copper busbar.

[0004] Existing generator-transformer short-circuit testing devices pose significant safety risks, such as electric shock, to operators during copper busbar disassembly, requiring them to be in close contact with live equipment. Therefore, disassembly can often only be performed after the unit has been shut down and the equipment completely de-energized. Frequent unit shutdowns not only increase the operating costs of power generation companies but also result in substantial time waste, severely impacting the operational efficiency and power supply stability of the power system. To address these issues, a generator-transformer short-circuit testing device is proposed. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a generator-transformer short-circuit test device, which aims to improve the problem that the disassembly of copper busbars in the prior art has a great safety risk and often requires the unit to be shut down for disassembly, which wastes a lot of time.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A generator-transformer short-circuit test device includes a mounting base, a double-layer copper busbar is provided on the side wall of the mounting base, a copper foil wire is provided between the double-layer copper busbar, a terminal is provided between opposite sides of the double-layer copper busbar, and a clamping assembly is provided on the side wall of the mounting base.

[0008] The clamping assembly includes a pressure plate located outside the double-layer copper busbar. A temperature sensor is installed inside the pressure plate. A motor is fixedly connected to the side wall of the mounting base. A gear is fixedly connected to the output end of the motor. A slide rail is fixedly connected to the side wall of the mounting base. A slider is slidably connected to the side wall of the slide rail. A fixing sleeve is fixedly connected to the side wall of the slider. An mounting sleeve is fixedly connected to the side wall of the fixing sleeve. A rack is fixedly connected inside the mounting sleeve. A buffer assembly is installed inside the fixing sleeve.

[0009] As a further description of the above technical solution:

[0010] The buffer assembly includes a connecting rod, the sidewall of which is fixedly connected inside the fixed sleeve.

[0011] As a further description of the above technical solution:

[0012] The pressure plate sidewall is slidably connected inside the fixed sleeve, the gear sidewall is rotatably connected inside the mounting base, and the gear meshes with the rack.

[0013] As a further description of the above technical solution:

[0014] A sliding block is slidably connected to the side wall of the connecting rod, and a spring is sleeved on the side wall of the connecting rod.

[0015] As a further description of the above technical solution:

[0016] One end of the spring is fixedly connected to the side wall of the sliding block, and the other end of the spring is fixedly connected to the inside of the fixed sleeve.

[0017] As a further description of the above technical solution:

[0018] A connecting strip is rotatably connected to the side wall of the sliding block, and one end of the connecting strip is rotatably connected to the side wall of the pressure plate.

[0019] As a further description of the above technical solution:

[0020] A limiting block is fixedly connected to the side wall of the connecting rod, and the side wall of the limiting block is attached to the side wall of the sliding block.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, by starting the motor, the gear is driven to rotate inside the mounting base. The rotation of the gear will push the rack to move along the slide rail, thereby driving the slider to slide on the slide rail. It moves to the double-layer copper busbar through the pressure plate, and finally presses the double-layer copper busbar onto the terminal, completing the connection of the short circuit point and achieving a rapid pressing effect. This solves the problem that the disassembly of the copper busbar of some generator-transformer short circuit test devices has a great safety risk and often requires the unit to be stopped for disassembly, which wastes a lot of time. The above structure improves the efficiency of disassembly and assembly of the short circuit point.

[0023] 2. In this utility model, when the terminal surface is uneven or there are installation errors, the resistance of the pressure plate will change. At this time, the pressure plate pushes the sliding block to slide on the connecting rod through the connecting strip, the spring is compressed, and the elastic force of the spring plays a buffering role, so that the pressure plate can adaptively adjust the clamping force to avoid poor contact or equipment damage caused by rigid clamping, while ensuring stable contact between the double-layer copper busbar and the terminal. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of a generator-transformer unit short-circuit test device proposed in this utility model;

[0025] Figure 2 This is a schematic diagram of the mounting base of a generator-transformer short-circuit test device proposed in this utility model;

[0026] Figure 3 This is a schematic diagram of the clamping assembly of a generator-transformer short-circuit test device proposed in this utility model;

[0027] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0028] Figure 5 This is a schematic diagram of the buffer assembly of a generator-transformer group short-circuit test device proposed in this utility model.

[0029] Legend:

[0030] 1. Mounting base; 2. Double-layer copper busbar; 3. Copper foil wire; 4. Pressure plate; 5. Motor; 6. Gear; 7. Slide rail; 8. Slider; 9. Fixing sleeve; 10. Mounting sleeve; 11. Rack; 12. Temperature sensor; 13. Terminal; 14. Connecting rod; 15. Sliding block; 16. Spring; 17. Connecting strip; 18. Limiting block. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figures 1-4 The present invention provides an embodiment of a generator-transformer short-circuit test device, comprising a mounting base 1, a double-layer copper busbar 2 disposed on the side wall of the mounting base 1, a copper foil wire 3 disposed between the double-layer copper busbar 2, and a terminal 13 disposed between opposite sides of the double-layer copper busbar 2. A clamping component is disposed on the side wall of the mounting base 1. The copper foil wire 3 is used to connect the double-layer copper busbar 2, playing the role of current conduction and flexible transition. It can be applied to generator-transformer short-circuit tests in various arrangement modes of transformer outgoing terminals 13. Through the design of the double-layer copper busbar 2, the size and spacing of the high-voltage side terminals 13 of transformers of various capacities can be adjusted by adjusting the copper foil wire 3.

[0033] The clamping assembly includes a pressure plate 4, located outside the double-layer copper busbar 2, used to press the double-layer copper busbar 2 onto the terminal 13, achieving reliable electrical contact and ensuring the continuity of the short-circuit circuit. A temperature sensor 12 is installed inside the pressure plate 4 to monitor the temperature of the contact area between the pressure plate 4 and the copper busbar in real time. By promptly feeding back temperature data, overheating due to excessive contact resistance can be effectively prevented, ensuring safe testing. A motor 5 is fixedly connected to the side wall of the mounting base 1, and a gear 6 is fixedly connected to the output end of the motor 5. The gear 6 and the output end of the motor 5 cooperate to rotate. A slide rail 7 is fixedly connected to the side wall of the mounting base 1, and a slider 8 is slidably connected to the side wall of the slide rail 7. The slider 8 cooperates with the slide rail 7 and slides on the slide rail 7, converting the rotational motion of the gear 6 into linear motion, thereby driving the connected components to move linearly. A fixing sleeve 9 is fixedly connected to the side wall of the slider 8. A mounting sleeve 10 is fixedly connected to the side wall of the fixed sleeve 9. A rack 11 is fixedly connected inside the mounting sleeve 10. The rack 11 meshes with the gear 6. The gear 6 converts the rotational motion into linear motion. The rotation of the gear 6 pushes the rack 11 to move along the slide rail 7, thereby driving the pressure plate 4 to press the double-layer copper busbar 2. A buffer component is set inside the fixed sleeve 9 to buffer the pressure plate 4 during the pressing process, avoiding damage to the copper busbar and terminal 13 due to rigid collision. The side wall of the pressure plate 4 is slidably connected inside the fixed sleeve 9. The pressure plate 4 and the fixed sleeve 9 cooperate and slide linearly under the guidance of the fixed sleeve 9, so that the pressure plate 4 can move accurately towards the double-layer copper busbar 2, achieving a stable and reliable pressing action. The side wall of the gear 6 is rotatably connected inside the mounting base 1. The gear 6 and the mounting base 1 cooperate and rotate stably inside the mounting base 1, ensuring the stability and reliability of power transmission.

[0034] Reference Figure 5 The buffer assembly includes a connecting rod 14, whose side wall is fixedly connected to the inside of the fixed sleeve 9. A sliding block 15 is slidably connected to the side wall of the connecting rod 14. The sliding block 15 slides on the connecting rod 14 in cooperation with it, realizing the transmission and conversion of force. A spring 16 is sleeved on the side wall of the connecting rod 14. The spring 16 is used to absorb and buffer the impact force generated by the pressure plate 4 during the pressing process. It converts kinetic energy into elastic potential energy through its own elastic deformation, playing a buffering role and avoiding damage to the copper busbar and terminal 13 due to rigid collision. One end of the spring 16 is fixedly connected to the side wall of the sliding block 15, and the other end of the spring 16 is fixedly connected to the inside of the fixed sleeve 9. When the sliding block 15 is on the connecting rod 14, the spring 16 is slidably connected to the inside of the fixed sleeve 9. When sliding upwards, the spring 16 will be compressed or stretched accordingly, thereby achieving the buffering function. The side wall of the sliding block 15 is rotatably connected to the connecting strip 17. The connecting strip 17 is used to connect the sliding block 15 and the pressure plate 4, converting the linear motion of the pressure plate 4 into the linear sliding of the sliding block 15, playing the role of force transmission and motion conversion. One end of the connecting strip 17 is rotatably connected to the side wall of the pressure plate 4. The side wall of the connecting rod 14 is fixedly connected to the limiting block 18. The limiting block 18 is used to limit the sliding range of the sliding block 15, preventing the sliding block 15 from sliding excessively, causing the spring 16 to exceed its elastic limit or other components to be damaged, ensuring the safe and stable operation of the buffer assembly. The side wall of the limiting block 18 is attached to the side wall of the sliding block 15.

[0035] Working principle: When using this equipment, the mounting base 1 is pre-fixed on the high-voltage side lead-out terminal 13 of the transformer, so that the double-layer copper busbar 2 is aligned with the high-voltage side lead-out terminal 13 of the transformer. At this time, the pressure plate 4 is located outside the double-layer copper busbar 2 and is in an unpressurized state. By starting the motor 5, the output end of the motor 5 drives the gear 6 to rotate inside the mounting base 1. Since the gear 6 meshes with the rack 11, the rotation of the gear 6 will push the rack 11 to move along the slide rail 7. The rack 11 is fixed inside the mounting sleeve 10, and then... The fixed sleeve 9 and slider 8 connected to the mounting sleeve 10 slide on the slide rail 7. When the fixed sleeve 9 moves, it pushes the pressure plate 4 towards the double-layer copper busbar 2 through the internal buffer assembly, and finally presses the double-layer copper busbar 2 onto the terminal 13, completing the connection of the short circuit point. During the process of the pressure plate 4 moving towards and pressing the double-layer copper busbar 2, if the surface of the terminal 13 is uneven or there are installation errors, the resistance of the pressure plate 4 will change. At this time, the pressure plate 4 pushes the sliding block 15 on the connecting rod 14 through the connecting strip 17. As the spring 16 slides upward, it is compressed. The elastic force of the spring 16 acts as a buffer, allowing the pressure plate 4 to adaptively adjust the clamping force, avoiding poor contact or equipment damage caused by rigid clamping. At the same time, it ensures stable contact between the double-layer copper busbar 2 and the terminal 13. During the entire short-circuit test, the temperature sensor 12 inside the pressure plate 4 monitors the temperature of the contact point between the double-layer copper busbar 2 and the terminal 13 in real time. The temperature sensor 12 transmits the collected temperature data to the background monitoring system. The test personnel can view the temperature changes in real time through the background system. Once the temperature exceeds the preset threshold, the background system will immediately issue an alarm to remind the test personnel to take appropriate measures to ensure the safe conduct of the test. After the generator-transformer unit short-circuit test is completed, the motor 5 is started in reverse, causing the gear 6 to rotate in reverse, driving the rack 11, the fixing sleeve 9 and the pressure plate 4 to move away from the double-layer copper busbar 2. The spring 16 gradually returns to its natural state, pushing the sliding block 15 and the pressure plate 4 to reset, and finally releasing the pressure plate 4, quickly removing the short-circuit point and completing the disassembly of the test device.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A generator-transformer short-circuit test device, comprising a mounting base (1), characterized in that: The mounting base (1) has a double-layer copper busbar (2) on its side wall, a copper foil wire (3) is provided between the double-layer copper busbar (2), a terminal (13) is provided between opposite sides of the double-layer copper busbar (2), and a clamping assembly is provided on the side wall of the mounting base (1). The clamping assembly includes a pressure plate (4), which is located outside the double-layer copper busbar (2). A temperature sensor (12) is installed inside the pressure plate (4). A motor (5) is fixedly connected to the side wall of the mounting base (1). A gear (6) is fixedly connected to the output end of the motor (5). A slide rail (7) is fixedly connected to the side wall of the mounting base (1). A slider (8) is slidably connected to the side wall of the slide rail (7). A fixing sleeve (9) is fixedly connected to the side wall of the slider (8). An installation sleeve (10) is fixedly connected to the side wall of the fixing sleeve (9). A rack (11) is fixedly connected inside the installation sleeve (10). A buffer assembly is installed inside the fixing sleeve (9).

2. The generator-transformer short-circuit test device according to claim 1, characterized in that: The buffer assembly includes a connecting rod (14), the side wall of which is fixedly connected inside the fixing sleeve (9).

3. The generator-transformer short-circuit test device according to claim 1, characterized in that: The side wall of the pressure plate (4) is slidably connected inside the fixed sleeve (9), and the side wall of the gear (6) is rotatably connected inside the mounting base (1). The gear (6) meshes with the rack (11).

4. The generator-transformer unit short-circuit test device according to claim 2, characterized in that: The connecting rod (14) has a sliding block (15) slidably connected to its side wall, and a spring (16) is sleeved on the side wall of the connecting rod (14).

5. The generator-transformer short-circuit test device according to claim 4, characterized in that: One end of the spring (16) is fixedly connected to the side wall of the sliding block (15), and the other end of the spring (16) is fixedly connected to the inside of the fixed sleeve (9).

6. The generator-transformer unit short-circuit test device according to claim 5, characterized in that: The sliding block (15) has a connecting strip (17) rotatably connected to its side wall, and one end of the connecting strip (17) is rotatably connected to the side wall of the pressure plate (4).

7. The generator-transformer unit short-circuit test device according to claim 4, characterized in that: The side wall of the connecting rod (14) is fixedly connected to the limiting block (18), and the side wall of the limiting block (18) is attached to the side wall of the sliding block (15).

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