Short-circuit test equipment for grid-connected box
By designing a grid-connected box short-circuit test device, and using a sealed box heater and mechanical components to simulate high temperature and mechanical compression, the problem that existing equipment cannot accurately simulate wire damage is solved, thus improving the accuracy of test results.
Patent Information
- Application Number
- CN202511243745.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-02
- Publication Date
- 2025-10-28
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Existing grid-connected box short-circuit testing equipment cannot accurately simulate the damage to wires under high temperature and external pressure when simulating actual short-circuit conditions, resulting in errors in the test results.
A short-circuit test device for grid-connected boxes was designed, comprising a test chamber, a sealed chamber, a dual-axis motor, a heater, and various mechanical components. By simulating high-temperature environments and mechanical compression, it simulates the damage to wires in actual use, thereby improving the accuracy of test results.
By simulating high temperatures and mechanical compression, the accuracy of short-circuit testing of grid-connected boxes is improved, which can better reflect the damage situation in actual use and reduce errors.
Smart Images
Figure CN120847675A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of grid-connected box technology, and in particular to a short-circuit testing device for grid-connected boxes. Background Technology
[0002] The grid-connected box is a core electrical device in a photovoltaic power generation system (especially a grid-connected photovoltaic system). In order to test whether the circuit breaker inside the grid-connected box can safely and reliably cut off the fault current within a specified time when a real short-circuit fault occurs, a short-circuit test operation needs to be performed on the grid-connected box before it is used. Currently, there are two main types of testing methods: non-destructive testing (indirect verification) and (simulated) short-circuit testing (direct verification). Non-destructive testing is primarily used for routine inspections, maintenance, and preliminary assessments. It does not actively generate actual short-circuit currents and carries relatively low risk, but it cannot 100% reproduce real short-circuit conditions. Short-circuit testing is the most direct and effective method for verifying the effectiveness of short-circuit protection, but it carries extremely high risk. It involves connecting the entire grid-connected box or a key circuit breaker within it to the test circuit, setting an expected short-circuit current value (usually set to be equal to or slightly higher than the maximum expected short-circuit current calculated at the circuit breaker's installation point), and closing the short-circuit switch under controlled conditions. The method involves artificially creating a short-circuit fault that closely resembles a real-world scenario, and then proceeding with the measurement. The overall operation is simple. However, in actual testing, this method merely simulates a short-circuit environment by applying a large current. In real-world use, short circuits often occur due to damage to the wires located outside the grid-connected box (caused by factors including, but not limited to, damage to the protective layer of the wires under high temperatures, leading to excessively high local temperatures; and damage to the wires due to external pressure). The lack of proper handling of the wires, especially those located outside the grid-connected box, ultimately results in inaccurate test results. Therefore, this paper proposes a grid-connected box short-circuit testing device. Summary of the Invention
[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a short-circuit testing device for grid-connected boxes.
[0004] The present invention adopts the following technical solution: A grid-connected box short-circuit testing device includes a test chamber, a bracket slidably installed inside the test chamber, a mounting plate fixedly connected to the bracket, a sealing box fixedly installed on the mounting plate via a threaded assembly, a dual-axis motor fixedly connected to the sealing box, a rotating shaft symmetrically rotatably connected inside the sealing box, the rotating shaft being driven by the output end of the dual-axis motor via a pulley assembly, the sealing box having an opening, a fixing plate fixedly connected to the sealing box, a threaded rod threadedly connected to the fixing plate, a base plate rotatably connected to the threaded rod, the base plate and the sealing box being slidably connected, a circular plate fixedly connected to the rotating shaft, an eccentric rod fixedly connected to the circular plate, a movable frame slidably connected to the sealing box, the eccentric rod and the movable frame being slidably connected, a square plate fixedly connected to the movable frame, a square cylinder slidably connected to the square plate, a second spring fixedly connected between the square cylinder and the square plate, a fixed pressure plate fixedly connected to the square cylinder, a movable pressure plate fixedly connected to the fixed pressure plate via a telescopic rod, and a heater fixedly connected to the sealing box.
[0005] Preferably, the sealed box is equipped with a control component for the movable pressure plate. The control component includes a reciprocating screw drum fixedly sleeved on the outside of the rotating shaft. The reciprocating screw drum is mechanically matched with a reciprocating sleeve. The reciprocating sleeve is fixedly connected to a second connecting plate via a connecting rod. The second connecting plate is fixedly connected to a movable plate. The movable plate is symmetrically fixedly connected to two limiting plates. Both limiting plates have inclined grooves. A sliding rod is slidably connected in the inclined grooves. The sliding rod is fixedly connected to the movable pressure plate.
[0006] Preferably, the movable plate is fixedly connected to a plurality of movable rods, the movable rods are slidably connected to a movable cylinder, and a first spring is fixedly connected between the movable cylinder and the movable rod.
[0007] Preferably, the eccentric rod is sleeved with a first connecting plate, the movable plate is fixedly connected to a fixed frame, and the first connecting plate and the fixed frame are slidably connected.
[0008] Preferably, a plurality of control clamps are uniformly fixedly connected to the side wall of the square tube, and a limit clamp is fixedly connected to the movable plate, with the limit clamp and the control clamp arranged opposite to each other.
[0009] Preferably, the movable plate slides through a connected slide plate, and the slide plate is slidably connected to the inner wall of the sealed box.
[0010] Preferably, a track is fixedly connected inside the test chamber, and the support and the track are slidably connected.
[0011] Preferably, the isolation assembly includes multiple isolation plates, which are grouped in pairs, and each isolation plate is mechanically connected by a first threaded mounting assembly and a mounting hole. The first threaded mounting assembly includes a first bolt that passes through the isolation plate, and a first nut is installed on the outer thread of the first bolt. The first nut is located on the lower side of the mounting plate and abuts against the mounting plate.
[0012] The beneficial effects of this invention are: 1. First, when performing short-circuit testing on the grid-connected box, place key components such as circuit breakers inside the box on the mounting plate and use a separation plate to isolate all components. This reduces the risk of damage to nearby components in the event of a short circuit or damage to the components. Furthermore, pass the wires of the grid-connected box (especially the wires located outside the grid-connected box in actual use) through the opening and place them inside the sealed box. Activate the heater to increase the temperature inside the sealed box, simulating the use of the wires under high-temperature irradiation, thereby improving the accuracy of the test results. 2. Secondly, when testing the grid-connected box, start the dual-axis motor to move the fixed pressure plate and the moving pressure plate up and down back and forth. When the fixed pressure plate, the moving pressure plate and the wire come into contact, they will squeeze the wire and cause damage to the wire. This can simulate the phenomenon of the wire being impacted during actual use, and thus make the test results closer to the actual value. 3. Furthermore, during the test, only the wires located under the fixed or movable pressure plate will be squeezed, while the wires not located under the fixed or movable pressure plate will not be squeezed. This also allows for a control effect during the test, which can further enrich the test results. 4. At the same time, during the test, when the fixed pressure plate and the wire are in contact, the moving pressure plate, which moves relative to the fixed pressure plate, will cause the squeezed wire to rotate. When the fixed pressure plate is not in contact with the wire, the moving pressure plate, which moves relative to the fixed pressure plate, will cause the range of each squeeze to be different, which can make the number of squeezes between the wires different. This can better simulate the actual use situation and thus improve the accuracy of the test results. 5. Finally, under the action of the eccentric rod, the moving plate, moving rod, and moving cylinder will move. The moving cylinder will abut against the wire, and under the action of the moving cylinder, the wire that is abutting against the moving cylinder will move, which can further abut against more different wires and the moving pressure plate, and can make the number of compressions between the wires different. In this process, when the moving plate moves, the moving plate will also drive the limiting plate to move, which can further adjust the position of the moving pressure plate, ultimately causing the compression range of the moving pressure plate to change further. This can better simulate the actual use situation, thereby improving the accuracy of the test results. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of a grid-connected box short-circuit testing device proposed in this invention; Figure 2 This is a schematic diagram of the internal structure of the test chamber in a grid-connected box short-circuit test device proposed in this invention; Figure 3 This is a schematic diagram of the support structure in a grid-connected box short-circuit testing device proposed in this invention; Figure 4 This is a schematic diagram of the support structure from another angle in a grid-connected box short-circuit testing device proposed in this invention; Figure 5 This is a schematic diagram of the sealed box structure in a grid-connected box short-circuit testing device proposed in this invention; Figure 6 This is a schematic diagram of the internal structure of the sealed box in a grid-connected box short-circuit testing device proposed in this invention; Figure 7 This is a schematic diagram showing the connection between the fixing plate and the base plate in a grid-connected box short-circuit testing device proposed in this invention; Figure 8 This is a schematic diagram showing the connection of the rotating shaft and the moving plate in a grid-connected box short-circuit testing device proposed in this invention; Figure 9 This is a schematic diagram showing the connection of the rotating shaft and the moving plate at another angle in a grid-connected box short-circuit testing device proposed in this invention. Figure 10 for Figure 9 Enlarged view of the structure at point A in the middle.
[0014] In the diagram: 1 Test chamber, 2 Bracket, 3 Track, 4 Mounting plate, 5 Isolation assembly, 6 Isolation plate, 7 First threaded mounting assembly, 8 Sealing box, 9 Dual-axis motor, 10 Pulley assembly, 11 Threaded assembly, 12 Opening, 13 Rotating shaft, 14 Heater, 15 Base plate, 16 Fixed plate, 17 Moving plate, 18 Threaded rod, 19 Reciprocating threaded sleeve, 20 Round plate, 21 Moving frame, 22 First connecting plate, 23 Connecting rod, 24 Second connecting plate, 25 Moving cylinder, 26 Square cylinder, 27 Fixed pressure plate, 28 Moving pressure plate, 29 Limiting plate, 30 Inclined groove, 31 Sliding rod, 32 Moving rod, 33 Square plate, 34 Fixed frame, 35 Reciprocating threaded sleeve, 36 Limiting clamp, 37 Control clamp, 38 Eccentric rod, 39 First bolt, 40 First nut, 41 Second bolt, 42 Second nut, 43 Slide plate. Detailed Implementation
[0015] See Figures 1-10A grid-connected box short-circuit test device includes a test box 1, a bracket 2 slidably installed inside the test box 1, a track 3 fixedly connected inside the test box 1, the bracket 2 and the track 3 slidably connected, a plurality of mounting plates 4 fixedly connected inside the bracket 2, a plurality of mounting holes being opened on the upper side of each mounting plate 4, an isolation component 5 being installed on the upper side of the mounting plate 4, the isolation component 5 including a plurality of isolation plates 6, the plurality of isolation plates 6 being in pairs, and each isolation plate 6 being mechanically connected to the mounting holes through a first threaded mounting component 7, the first threaded mounting component 7 including a first bolt 39 penetrating through the isolation plate 6, a first nut 40 being threaded on the outer side of the first bolt 39, the first nut 40 being located on the lower side of the mounting plate 4 and abutting against the mounting plate 4; First, a sealed door is rotatably mounted on the front of test chamber 1, and an observation window is installed on the side wall of the sealed door. Second, multiple high-definition cameras and temperature sensors are also installed inside test chamber 1. A controller and display screen are installed on the upper side of test chamber 1. The display screen and high-definition cameras are electrically connected to the controller via wires. When performing a short-circuit test on the grid-connected box, the actual internal temperature of test chamber 1 can be detected by the temperature sensor. If the internal temperature of test chamber 1 is suddenly detected to be too high during the short-circuit test, the test needs to be interrupted in time to reduce the occurrence of an explosion. Third, when it is necessary to perform a test on the grid-connected box, place the grid-connected box inside test chamber 1, connect the grid-connected box and the controller using wires, and disconnect the circuit inside the grid-connected box. Key components such as the device are placed on the mounting plate 4, and then the isolation plate 6 is placed between two adjacent components. The first bolt 39 is inserted into the mounting hole, and the first nut 40 is turned to complete the installation of the isolation plate 6. During the short circuit test, the current to the grid-connected box is adjusted by the controller, and the current is gradually increased at intervals. During this process, the grid-connected box is monitored by a temperature sensor and a high-definition camera to monitor the changes in the grid-connected box until the current reaches the corresponding level. Finally, the short circuit test of the grid-connected box is completed. In the above process, under the action of the isolation plate 6, all components can be isolated, reducing the damage to nearby components when a short circuit occurs. Mounting plate 4 is fixedly connected to sealing box 8 via threaded assembly 11. Threaded assembly 11 includes a second bolt 41 fixedly installed on the lower side of sealing box 8. A second nut 42 is threadedly connected to the outer side of the second bolt 41. The second nut 42 is located on the lower side of mounting plate 4 and abuts against mounting plate 4. A dual-axis motor 9 is fixedly connected to the upper side of sealing box 8. Two rotating shafts 13 are symmetrically rotatably connected inside sealing box 8. Both rotating shafts 13 are driven by pulley assembly 10 and the output end of dual-axis motor 9. Openings 12 are opened on both sides of sealing box 8. A fixing plate 16 is fixedly connected inside sealing box 8. A threaded rod 18 is threadedly connected to the upper side of fixing plate 16. A base plate 15 is rotatably connected to the upper side of threaded rod 18. The base plate 15 and sealing box 8 are slidably connected. A circular plate 20 is fixedly connected to the outer side of the rotating shaft 13. An eccentric rod 38 is fixedly connected to the side wall of the circular plate 20. Two movable frames 21 are symmetrically slidably connected inside the sealed box 8. One end of the eccentric rod 38 extends into the movable frame 21 and is slidably connected to the movable frame 21. A square plate 33 is fixedly connected to the lower side of the movable frame 21. A square cylinder 26 is slidably connected to the lower side of the square plate 33. A second spring is fixedly connected between the square cylinder 26 and the square plate 33. A fixed pressure plate 27 is fixedly connected to the lower side of the square cylinder 26. Movable pressure plates 28 are fixedly connected to both sides of the fixed pressure plate 27 through telescopic rods. A sliding plate 43 is slidably connected through the movable plate 17. The sliding plate 43 is slidably connected to the inner wall of the sealed box 8. A heater 14 is fixedly connected to the sealed box 8. First, when performing a short-circuit test on the grid-connected box, the wires of the grid-connected box (especially those located outside the box during actual use) are passed through opening 12 and placed inside the sealed box 8, with the wires positioned above the base plate 15. The threaded rod 18 is rotated to move the base plate 15 upward relative to the sealed box 8 until the distance between the base plate 15 and the fixed pressure plate 27 meets the operational requirements. When a short-circuit test is required, to better simulate wires that have been in use for a long time, the heater 14 (i.e., the electromagnetic heater 14) is activated to increase the temperature inside the sealed box 8, simulating the use of the wires under high-temperature irradiation. The dual-axis motor 9 is also activated, which drives the rotating shaft 13 to rotate via the pulley assembly 10. The rotating shaft 13 drives the circular plate 20 and the eccentric rod 38 to rotate. Because the eccentric rod 38 and the circular plate 20 are in an eccentric state, and the movement... The moving frame 21 and the sealing box 8 are connected vertically. Therefore, during the rotation of the eccentric rod 38, the moving frame 21 will move vertically relative to the sealing box 8. The moving frame 21 drives the fixed pressure plate 27 to move vertically through the square plate 33, the second spring, and the square cylinder 26. The fixed pressure plate 27 drives the moving pressure plate 28 to move vertically. When the fixed pressure plate 27 comes into contact with the wire, it will squeeze the wire and cause damage to the wire. This can simulate the phenomenon of the wire being impacted during actual use, so that the test results are closer to the actual values. During the test, only the wires located under the fixed pressure plate 27 or the moving pressure plate 28 will be squeezed. The wires not located under the fixed pressure plate 27 or the moving pressure plate 28 will not be squeezed. During the test, a control effect can also be formed, which can enrich the test results.
[0016] The sealed box 8 is equipped with a control component for the movable pressure plate 28. The control component includes a reciprocating screw spool 35 fixedly sleeved on the outside of the rotating shaft 13. A reciprocating screw sleeve 19 is mechanically matched to the outside of the reciprocating screw spool 35. A second connecting plate 24 is fixedly connected to the lower side of the reciprocating screw sleeve 19 through a connecting rod 23. A movable plate 17 is fixedly connected to the second connecting plate 24. Two limiting plates 29 are symmetrically fixedly connected to the side wall of the movable plate 17. An inclined groove 30 is opened on the upper side of each of the two limiting plates 29. A sliding rod 31 is slidably connected in the inclined groove 30. The sliding rod 31 is fixedly connected to the movable pressure plate 28. First, the reciprocating screw spool 35, reciprocating screw sleeve 19, and reciprocating screw have the same structural principle. Second, during the rotation of the rotating shaft 13, the rotating shaft 13 drives the reciprocating screw spool 35 to rotate, so as to... Figure 6From the perspective of sliding plate 17, slide plate 43 is slidably connected to sliding plate 43. Sliding plate 43 is slidably connected to the inner wall of sealing box 8. The sliding mode of sliding plate 43 is left and right, that is, sliding plate 17 and the upper inner wall of sealing box 8 are in a parallel state. Since sliding plate 17, second connecting plate 24, and connecting rod 23 are fixedly connected, the rotating shaft 13 and reciprocating screw spool 35 will drive reciprocating screw sleeve 19, connecting rod 23, and second connecting plate 24 to drive sliding plate 17 to move back and forth, that is, drive slide plate 43 to move left and right back and forth. Sliding plate 17 drives limiting plate 29 to move. Under the restriction of inclined groove 30, it will lead to The movable pressure plate 28 moves relative to the fixed pressure plate 27. When the fixed pressure plate 27 comes into contact with the wire, the movable pressure plate 28, which moves relative to the fixed pressure plate 27, causes the compressed wire to twist due to friction between the movable pressure plate 28 and the wire. Therefore, the position of the movable pressure plate 28 changes each time the fixed pressure plate 27 comes into contact with the wire. As a result, the movable pressure plate 28, which moves relative to the fixed pressure plate 27, causes the range of compression to be different each time, which can make the number of compressions between the wires different. This can better simulate the actual use situation and thus improve the accuracy of the test results.
[0017] Multiple moving rods 32 are evenly fixedly connected to the lower side of the movable plate 17. Moving cylinders 25 are slidably connected to the outer sides of the moving rods 32. A first spring is fixedly connected between the moving cylinders 25 and the moving rods 32. A first connecting plate 22 is sleeved on the outer side of the eccentric rod 38. A fixed frame 34 is fixedly connected to the upper side of the movable plate 17. The first connecting plate 22 and the fixed frame 34 are slidably connected. The sliding method of the first connecting plate 22 and the fixed frame 34 is shown in the attached figure. Figure 9 In short, it involves swiping left and right; During the rotation of the eccentric rod 38, the eccentric rod 38 drives the moving plate 17 to move back and forth relative to the slide plate 43 through the first connecting plate 22. The moving plate 17 drives the moving rod 32 and the moving cylinder 25 to move back and forth. The moving cylinder 25 abuts against the wire. Under the action of the moving cylinder 25, the wire that abuts against the moving cylinder 25 will move, which can further make more different areas of the wire abut against the moving pressure plate 28, and can make the number of compressions between the wires more different. In this process, when the moving plate 17 moves, the moving plate 17 will also drive the limiting plate 29 to move, which can further adjust the position of the moving pressure plate 28, ultimately causing the compression range of the moving pressure plate 28 to change further. This can better simulate the actual use situation, thereby improving the accuracy of the test results.
[0018] Multiple control clamps 37 are evenly fixedly connected to the side wall of the square tube 26, and a limit clamp 36 is fixedly connected to the side wall of the movable plate 17. The limit clamp 36 and the control clamp 37 are arranged opposite to each other. Under the action of the reciprocating thread sleeve 19 and the reciprocating thread cylinder 35, the moving plate 17 moves back and forth, and the moving plate 17 drives the limiting clamp 36 to move back and forth. When the limiting clamp 36 moves to the space between two adjacent control clamps 37 and abuts against one of the control clamps 37, the square cylinder 26 will be relatively displaced relative to the square plate 33 due to the obstruction of the limiting clamp 36, and the first spring will deform. When the connection between the limiting clamp 36 and the control clamp 37 is broken, under the dual action of the square plate 33 and the first spring, the square plate 33 and the fixed pressure plate 27 move downward quickly. At this time, the action of the fixed pressure plate 27 on the wire will change, resulting in different squeezing forces. This can better simulate the actual use situation and thus improve the accuracy of the test results.
[0019] In this invention, before performing a short-circuit test on the grid-connected box, the wires of the grid-connected box (especially the wires located outside the grid-connected box in actual use) are passed through the opening 12 and placed inside the sealed box 8. The threaded rod 18 is rotated to move the base plate 15 upward relative to the sealed box 8 until the distance between the base plate 15 and the fixed pressure plate 27 meets the working requirements. When it is necessary to perform a test on the grid-connected box, the grid-connected box is placed inside the test chamber 1. The grid-connected box and the controller are electrically connected using wires. Key components such as the circuit breaker inside the grid-connected box are placed on the mounting plate 4. Then, the isolation plate 6 is placed between two adjacent components, and the first bolt 39 is inserted into the mounting hole. The first nut 40 is rotated to adjust the current flowing to the grid-connected box. The current is gradually increased at intervals, and the changes in the grid-connected box are monitored until the current reaches the corresponding level. Finally, the short-circuit test on the grid-connected box is completed. During the short-circuit test, the heater 14 is activated to increase the temperature inside the sealed box 8, simulating the use of the wire under high-temperature irradiation. The dual-axis motor 9 is also activated, which drives the rotating shaft 13 to rotate via the pulley assembly 10. The rotating shaft 13 drives the circular plate 20 and the eccentric rod 38 to rotate. The eccentric rod 38 drives the moving frame 21 to move up and down relative to the sealed box 8. The moving frame 21 drives the fixed pressure plate 27 to move up and down via the square plate 33, the second spring, and the square cylinder 26. The fixed pressure plate 27 drives the moving pressure plate 28 to move up and down. When the fixed pressure plate 27 comes into contact with the wire, it will squeeze the wire, causing damage to the wire. During the test, only the wires located under the fixed pressure plate 27 or the moving pressure plate 28 will be squeezed. Wires not located under the fixed pressure plate 27 or the moving pressure plate 28 will not be squeezed. During the test, a control effect can also be formed, which can enrich the test results. During the rotation of the rotating shaft 13, the rotating shaft 13 drives the reciprocating wire drum 35 to rotate. The reciprocating wire drum 35 drives the reciprocating wire sleeve 19, the connecting rod 23, and the second connecting plate 24 to move the moving plate 17 back and forth. The moving plate 17 drives the limiting plate 29 to move. The moving pressure plate 28 moves relative to the fixed pressure plate 27. When the fixed pressure plate 27 comes into contact with the wire, the moving pressure plate 28, which moves relative to the fixed pressure plate 27, will cause the squeezed wire to twist. This is because the moving pressure plate 28 rubs against the wire. Therefore, the position of the moving pressure plate 28 will change each time the fixed pressure plate 27 comes into contact with the wire. Thus, the moving pressure plate 28, which moves relative to the fixed pressure plate 27, will cause the range of each squeeze to be different. This can make the number of times the wire is squeezed different, which can better simulate the actual use situation and thus improve the accuracy of the test results. During the rotation of the eccentric rod 38, the eccentric rod 38 will drive the moving plate 17 to move back and forth relative to the slide plate 43 through the first connecting plate 22. The moving plate 17 drives the moving rod 32 and the moving cylinder 25 to move back and forth. The moving cylinder 25 abuts against the wire. Under the action of the moving cylinder 25, the wire that abuts against the moving cylinder 25 will move, which can further make more different areas of the wire abut against the moving pressure plate 28, and can make the number of compressions between the wires further different. In this process, when the moving plate 17 moves, the moving plate 17 will also drive the limiting plate 29 to move, which can further adjust the position of the moving pressure plate 28, ultimately causing the compression range of the moving pressure plate 28 to change further, which can better simulate the actual use situation, thereby improving the accuracy of the test results. When the moving plate 17 moves back and forth, it drives the limiting clamp 36 to move back and forth as well. When the limiting clamp 36 moves between two adjacent control clamps 37 and comes into contact with one of them, the relative displacement between the square cylinder 26 and the square plate 33 will occur due to the obstruction of the limiting clamp 36. The first spring will deform. When the connection between the limiting clamp 36 and the control clamp 37 is broken, the square plate 33 and the fixed pressure plate 27 will move downward rapidly under the combined action of the square plate 33 and the first spring. At this time, the action of the fixed pressure plate 27 on the wire will change, resulting in different squeezing forces. This can better simulate the actual use situation and thus improve the accuracy of the test results.
Claims
1. A grid-connected box short-circuit testing device, comprising a test chamber (1), characterized in that, A bracket (2) is slidably installed inside the test chamber (1). A mounting plate (4) is fixedly connected to the bracket (2). An isolation component (5) is installed on the mounting plate (4). A sealing box (8) is fixedly installed on the mounting plate (4) via a threaded assembly (11). A dual-axis motor (9) is fixedly connected to the sealing box (8). A rotating shaft (13) is rotatably connected to the sealing box (8). The rotating shaft (13) is driven by a pulley assembly (10) and the output end of the dual-axis motor (9). The sealing box (8) has an opening (12). A fixing plate (16) is fixedly connected to the sealing box (8). A threaded rod (18) is threaded through the fixing plate (16). A base plate (15) is rotatably connected to the threaded rod (18). The base plate (15) and the sealing box (8) are slidably connected. The rotating shaft (13) is fixedly connected to a circular plate (20). The circular plate (20) is fixedly connected to an eccentric rod (38). The sealing box (8) is slidably connected to a moving frame (21). The eccentric rod (38) and the moving frame (21) are slidably connected. The moving frame (21) is fixedly connected to a square plate (33). The square plate (33) is slidably connected to a square cylinder (26). A second spring is fixedly connected between the square cylinder (26) and the square plate (33). The square cylinder (26) is fixedly connected to a fixed pressure plate (27). The fixed pressure plate (27) is fixedly connected to a moving pressure plate (28) via a telescopic rod. The sealing box (8) is fixedly connected to a heater (14).
2. The grid-connected box short-circuit testing device according to claim 1, characterized in that, The sealed box (8) is equipped with a control component for the movable pressure plate (28). The control component includes a reciprocating spool (35) fixedly sleeved on the outside of the rotating shaft (13). The reciprocating spool (35) is mechanically matched with a reciprocating sleeve (19). The reciprocating sleeve (19) is fixedly connected to a second connecting plate (24) via a connecting rod (23). The second connecting plate (24) is fixedly connected to a moving plate (17). The moving plate (17) is symmetrically fixedly connected to two limiting plates (29). Both limiting plates (29) have inclined grooves (30). A sliding rod (31) is slidably connected in the inclined grooves (30). The sliding rod (31) is fixedly connected to the movable pressure plate (28).
3. The grid-connected box short-circuit testing device according to claim 2, characterized in that, The movable plate (17) is fixedly connected to a plurality of movable rods (32), the movable rods (32) are slidably connected to a movable cylinder (25), and a first spring is fixedly connected between the movable cylinder (25) and the movable rods (32).
4. The grid-connected box short-circuit testing device according to claim 3, characterized in that, The eccentric rod (38) is sleeved with a first connecting plate (22), and the movable plate (17) is fixedly connected with a fixed frame (34). The first connecting plate (22) and the fixed frame (34) are slidably connected.
5. A grid-connected box short-circuit testing device according to claim 3, characterized in that, The square tube (26) has multiple control clamps (37) evenly fixedly connected to its side wall, and the moving plate (17) is fixedly connected to a limit clamp (36). The limit clamp (36) and the control clamp (37) are arranged opposite to each other.
6. The grid-connected box short-circuit testing device according to claim 5, characterized in that, The movable plate (17) slides through the slide plate (43), and the slide plate (43) is slidably connected to the inner wall of the sealed box (8).
7. A grid-connected box short-circuit testing device according to claim 6, characterized in that, The test chamber (1) is fixedly connected to a track (3), and the bracket (2) and the track (3) are slidably connected.
8. A grid-connected box short-circuit testing device according to claim 1, characterized in that, The isolation assembly (5) includes multiple isolation plates (6), which are arranged in pairs. Each isolation plate (6) is mechanically connected by a first threaded mounting assembly (7) and a mounting hole (5). The first threaded mounting assembly (7) includes a first bolt (39) that passes through the isolation plate (6). A first nut (40) is threaded on the outer side of the first bolt (39). The first nut (40) is located on the lower side of the mounting plate (4) and abuts against the mounting plate (4).