SPD testing device with timing self-calibration function

Abstract

The utility model provides a kind of SPD test equipment with timing self-calibration function, it is related to SPD test technical field, including tester, the surface of tester is equipped with square hole, the inside of square hole is embedded with U type board, the inside of U type board is equipped with moving plate, the surface of moving plate and near bottom center place are penetrated and screw thread connection with screw rod, the side wall of moving plate is penetrated and is fixedly connected with three resistance rods at equal intervals, the both ends inner wall of square hole is equipped with convex hole. In the utility model, the automatic switching of resistance rod is realized by motor driving moving plate, without manual disassembly, improve replacement process efficiency, greatly reduce test interruption time, also can improve test accuracy, the design of convex conductive rod and resistance rod, spring buffer convex plate compression structure, guarantee the circuit conduction stability after resistance switching, adapt to the test demand of different specifications SPD.

Description

Technical Field

[0001] This utility model relates to the field of SPD testing technology, and in particular to an SPD testing device with a timed self-calibration function. Background Technology

[0002] Surge protectors (SPDs) are core protection devices in power, communications, and industrial control fields. The accurate testing of their performance parameters (nominal discharge current, residual voltage, leakage current, etc.) directly affects the safety of downstream equipment. Core components of SPD testing equipment (such as sampling resistors and reference resistors) are prone to accuracy drift due to aging, temperature drift, and other factors. If they cannot be calibrated or replaced in a timely manner, it will cause distorted test data and misjudgment of SPD performance (such as classifying a failed SPD as qualified).

[0003] In scenarios such as industrial inspection and power maintenance, SPD testing needs to be performed frequently and continuously. Traditional equipment's core resistive components (such as shunt resistors and reference resistors) are mostly fixed. If they age or are damaged, they need to be manually disassembled and replaced, which is cumbersome and prone to introducing new errors due to operational mistakes. Therefore, there is a need for an SPD testing device that can automatically replace resistor bars and has a timed self-calibration function to achieve rapid switching of resistive components and real-time accuracy assurance, meeting the efficiency and reliability requirements of SPD testing. Utility Model Content

[0004] The purpose of this invention is to solve the problem that in the existing technology, the core resistive components of the equipment (such as shunt resistors and reference resistors) are mostly fixed, and if they are aged or damaged, they need to be manually disassembled and replaced, which is a cumbersome process and is prone to introducing new errors due to operational mistakes. Therefore, this invention proposes an SPD test device with a timed self-calibration function.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an SPD testing device with a timed self-calibration function, comprising a tester, wherein a square hole is formed on the surface of the tester, a U-shaped plate is embedded inside the square hole, a movable plate is provided inside the U-shaped plate, a screw is threaded through and connected to the surface of the movable plate near the bottom center, three resistance rods are equally spaced through and fixedly connected to one side wall of the movable plate, convex holes are formed on the inner walls of both ends of the square hole, convex conductive rods are embedded and fixedly connected inside the convex holes, connecting wires are fixedly connected to both ends of the tester at the convex holes, three trapezoidal slots are equally spaced on the top of the movable plate, pressure sensors are embedded and fixedly connected to the bottom inner wall of the trapezoidal slots near the center, a convex cavity is formed inside the tester near the top, the bottom of the convex cavity is interconnected with the square hole, a convex plate is provided inside the convex cavity, and springs are fixedly connected to the top of the convex plate near the four corners.

[0006] Preferably, the bottom of the tester and near its four corners are fixedly connected to a support plate, and the bottom of the support plate is fixedly connected to an anti-slip pad.

[0007] Preferably, the tester has mounting grooves on one side wall at both ends of the square hole, and mounting plates are embedded inside the mounting grooves. The mounting plates are fixedly connected to the U-shaped plate.

[0008] Preferably, a handle is fixedly connected to one side wall of the U-shaped plate near the center.

[0009] Preferably, one end of the screw is rotatably connected to a U-shaped plate bearing, a motor is embedded and fixedly connected to one side wall of the U-shaped plate, and the output end of the motor is fixedly connected to one end of the screw.

[0010] Preferably, the surface of the movable plate and near both ends are slidably connected with limit rods, and both ends of the limit rods are fixedly connected to the U-shaped plate.

[0011] Preferably, the resistance rod is at the same height as the convex hole.

[0012] Preferably, the bottom of the convex plate is embedded in and adapted to the trapezoidal groove.

[0013] Preferably, each spring has a vertical rod passing through its center, the bottom of each vertical rod passing through and slidably connected to a convex plate, and both ends of each vertical rod being fixedly connected to the inner wall of the convex cavity.

[0014] Preferably, the bottom of the convex plate is trapezoidal.

[0015] Compared with the prior art, the advantages and positive effects of this utility model are as follows: 1. In this utility model, the automatic switching of the resistance rod is achieved by driving the moving plate with a motor, eliminating the need for manual disassembly, improving the efficiency of the replacement process, significantly reducing test interruption time, and also improving test accuracy.

[0016] 2. In this utility model, the equal height design of the convex conductive rod and the resistance rod, and the spring-buffered convex plate pressing structure, ensure the circuit conduction stability after resistance switching and adapt to the testing requirements of SPDs of different specifications.

[0017] 3. In this utility model, the automated resistor replacement and calibration process reduces reliance on professional personnel, which can reduce equipment operation and maintenance costs. Attached Figure Description

[0018] Figure 1 This utility model provides a three-dimensional view of the overall structure of an SPD testing device with a timed self-calibration function; Figure 2A cross-sectional view of the overall structure of an SPD testing device with timed self-calibration function is provided for this utility model. Figure 3 This utility model provides a vertical sectional view of the overall structure of an SPD testing device with a timed self-calibration function. Figure 4 A three-dimensional view of a convex plate structure for an SPD testing device with a timed self-calibration function is provided for this utility model. Figure 5 This invention presents a three-dimensional view of a movable board structure for an SPD testing device with a timed self-calibration function.

[0019] Legend: 1. Tester; 2. Support plate; 3. Anti-slip pad; 4. Square hole; 5. U-shaped plate; 6. Mounting groove; 7. Mounting plate; 8. Handle; 9. Moving plate; 10. Screw; 11. Limiting rod; 12. Motor; 13. Resistance rod; 14. Convex hole; 15. Convex conductive rod; 16. Connecting wire; 17. Trapezoidal groove; 18. Pressure sensor; 19. Convex cavity; 20. Convex plate; 21. Vertical rod; 22. Spring. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0022] Example 1, such as Figure 1-5As shown, this utility model provides an SPD testing device with a timed self-calibration function, including a tester 1. A square hole 4 is formed on the surface of the tester 1. A U-shaped plate 5 is embedded inside the square hole 4. A movable plate 9 is located inside the U-shaped plate 5. A screw 10 is threaded through and connected to the surface of the movable plate 9 near its bottom center. Three resistance rods 13 are evenly spaced through and fixedly connected to one side wall of the movable plate 9. Convex holes 14 are formed on the inner walls of both ends of the square hole 4. Each of the convex holes 14 is embedded and fixedly connected to... A convex conductive rod 15 is connected to the tester 1. Connecting wires 16 are fixedly connected to both ends of the tester 1 at the convex holes 14. Three trapezoidal slots 17 are equally spaced on the top of the moving plate 9. A pressure sensor 18 is embedded and fixedly connected to the bottom inner wall of the trapezoidal slot 17 near the center. A convex cavity 19 is opened inside the tester 1 near the top. The bottom of the convex cavity 19 is connected to the square hole 4. A convex plate 20 is provided inside the convex cavity 19. Springs 22 are fixedly connected to the top of the convex plate 20 near the four corners.

[0023] The overall effect of embodiment 1 is as follows: a square hole 4 is opened on the surface of the tester 1, a U-shaped plate 5 is embedded inside the square hole 4, a movable plate 9 is provided inside the U-shaped plate 5, a screw 10 is threaded through and connected to the surface of the movable plate 9 near the bottom center, and three resistance rods 13 are evenly spaced through and fixedly connected to one side wall of the movable plate 9. This allows the screw 10 to rotate, thereby moving the movable plate 9, and the movement of the movable plate 9 can adjust the position of the resistance rods 13. A convex hole 14 is opened on the inner wall of both ends of the square hole 4, and a convex conductive rod 15 is embedded and fixedly connected inside each convex hole 14. Connecting wires 16 are fixedly connected to both ends of the tester 1 at the convex holes 14, which can transmit electricity through the convex conductive rods. The effect of the rod 15 transmitting power to another convex conductive rod 15 through the resistance rod 13 is achieved by three equally spaced trapezoidal slots 17 on the top of the moving plate 9. A pressure sensor 18 is embedded and fixedly connected to the bottom inner wall of the trapezoidal slot 17 near the center. A convex cavity 19 is provided inside the tester 1 near the top. The bottom of the convex cavity 19 is connected to the square hole 4. A convex plate 20 is provided inside the convex cavity 19. Springs 22 are fixedly connected to the top of the convex plate 20 near the four corners. This can sense the position of the convex plate 20. When the convex plate 20 is pushed into the trapezoidal slot 17 by the springs 22, the controller can control the motor 12 to shut down, thereby aligning the resistance rod 13 with the convex conductive rod 15.

[0024] Example 2, as Figure 1-5As shown, support plates 2 are fixedly connected to the bottom of the tester 1 near its four corners, and anti-slip pads 3 are fixedly connected to the bottom of each support plate 2; mounting grooves 6 are opened on one side wall of the tester 1 at both ends of the square hole 4, and mounting plates 7 are embedded inside each mounting groove 6, and the mounting plates 7 are fixedly connected to the U-shaped plate 5; a handle 8 is fixedly connected to one side wall of the U-shaped plate 5 near its center; one end of the screw 10 is rotatably connected to the bearing of the U-shaped plate 5, and a motor 12 is embedded and fixedly connected to one side wall of the U-shaped plate 5, and the motor 12 outputs... The output end is fixedly connected to one end of the screw 10; the surface of the movable plate 9 and near both ends are connected to the limit rod 11, and both ends of the limit rod 11 are fixedly connected to the U-shaped plate 5; the resistance rod 13 is at the same height as the convex hole 14; the bottom of the convex plate 20 is embedded in the trapezoidal groove 17 and is adapted to it; the center of the spring 22 is connected to the vertical rod 21, the bottom of the vertical rod 21 is connected to the convex plate 20 and is slidably connected to it, and both ends of the vertical rod 21 are fixedly connected to the inner wall of the convex cavity 19; the bottom of the convex plate 20 is trapezoidal.

[0025] The overall effect of embodiment 2 is as follows: Support plates 2 are fixedly connected to the bottom of the tester 1 near its four corners, and anti-slip pads 3 are fixedly connected to the bottom of each support plate 2, thus supporting the bottom of the tester 1; mounting grooves 6 are provided on one side wall of the tester 1 at both ends of the square hole 4, and mounting plates 7 are embedded inside each mounting groove 6. The mounting plates 7 are fixedly connected to the U-shaped plate 5, thus securing the U-shaped plate 5; a handle 8 is fixedly connected to one side wall of the U-shaped plate 5 near its center, thus facilitating the pulling of the U-shaped plate 5; one end of a screw 10 is rotatably connected to the bearing of the U-shaped plate 5, and a motor 12 is embedded and fixedly connected to one side wall of the U-shaped plate 5. The output end of the motor 12 is fixedly connected to one end of the screw 10, thus enabling the motor 12 to drive the screw 10 to rotate; and the moving plate 9... The surface of the plate 20 is slidably connected to the U-shaped plate 5 at both ends, and the two ends of the limiting rod 11 are fixedly connected to the U-shaped plate 5, which can limit the moving plate 9. The resistance rod 13 is at the same height as the convex hole 14, which can align the resistance rod 13 with the convex hole 14. The bottom of the convex plate 20 is embedded in the trapezoidal groove 17 and adapted to it, which can embed the bottom of the convex plate 20 into the trapezoidal groove 17. The center of the spring 22 is pierced by a vertical rod 21, the bottom of the vertical rod 21 is slidably connected to the convex plate 20, and the two ends of the vertical rod 21 are fixedly connected to the inner wall of the convex cavity 19, which can limit the convex plate 20. The bottom of the convex plate 20 is trapezoidal, which can fully embed the bottom of the convex plate 20 into the trapezoidal groove 17.

[0026] Working principle: After the equipment is started, the tester 1 is stably placed by the bottom support plate 2 and the anti-slip pad 3, and the connecting line 16 is connected to the SPD test circuit. After the user presets the calibration cycle, the timing module triggers the initial calibration process. The motor 12 drives the screw 10 to rotate, which drives the moving plate 9 to slide along the limit rod 11, moving the first set of resistance rods 13 to the power-on test area aligned with the convex holes 14 at both ends of the square hole 4. Under the elastic action of the spring 22 and the vertical rod 21, the convex plate 20 in the convex cavity 19 is embedded in the trapezoidal groove 17 on the top of the moving plate 9. After the pressure sensor 18 detects that the contact pressure meets the standard and ensures that the resistance rods 13 and the convex conductive rods 15 are tightly connected, the equipment enters the normal operation phase. Normal test mode; During the test, the timing module triggers self-calibration according to the preset cycle. The internal standard signal source outputs a reference signal, which is collected by the currently connected resistor rod 13 and the test circuit. The deviation is calculated by comparing the measured value with the reference value, and the calibration parameters are automatically corrected. If the pressure sensor 18 detects abnormal contact or the calibration deviation exceeds the threshold, the motor 12 drives the moving plate 9 to switch to the backup resistor rod 13 again, repeating the pressing and pressure detection process of the convex plate 20 until the resistor rod 13 is conducting normally and the calibration is qualified. No manual intervention is required throughout the process. The U-shaped plate 5 is fixed to the mounting slot 6 by the mounting plate 7. If overall maintenance is required, the U-shaped plate 5 can be pulled out by the handle 8 for operation.

[0027] The wiring diagrams of the tester 1, motor 12, resistance rod 13, convex conductive rod 15, and pressure sensor 18 in this utility model are common knowledge in the field. Their working principles are known technologies. The appropriate model is selected according to actual use. Therefore, the control methods and wiring arrangements of the tester 1, motor 12, resistance rod 13, convex conductive rod 15, and pressure sensor 18 will not be explained in detail.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. An SPD testing device with timed self-calibration function, comprising a tester (1), characterized in that: The tester (1) has a square hole (4) on its surface. A U-shaped plate (5) is embedded inside the square hole (4). A movable plate (9) is provided inside the U-shaped plate (5). A screw (10) is threaded through and connected to the surface of the movable plate (9) near the bottom center. Three resistance rods (13) are threaded through and fixedly connected to one side wall of the movable plate (9) at equal intervals. A convex hole (14) is provided on the inner wall of both ends of the square hole (4). A convex conductive rod (15) is embedded and fixedly connected inside the convex hole (14). The tester (1) has a square hole (4) on its surface. A U-shaped plate (5) is embedded inside the square hole (4). A U-shaped plate (5) is embedded inside the square hole (4). A U-shaped plate (5) is embedded inside the square hole (4). A U-shaped plate (9) is embedded inside the U-shaped plate (5 ...9). A U-shaped plate (9) is embedded inside the U-shaped plate Both ends are fixedly connected to the convex hole (14) with connecting wires (16). The top of the moving plate (9) is provided with three trapezoidal grooves (17) at equal intervals. The bottom inner wall of the trapezoidal groove (17) and near the center are embedded and fixedly connected with pressure sensors (18). The inside of the tester (1) and near the top is provided with a convex cavity (19). The bottom of the convex cavity (19) is connected to the square hole (4). The inside of the convex cavity (19) is provided with a convex plate (20). The top of the convex plate (20) and near the four corners are fixedly connected with springs (22).

2. The SPD testing device with timed self-calibration function according to claim 1, characterized in that: The bottom of the tester (1) and near the four corners are all fixedly connected to support plates (2), and the bottom of the support plates (2) are all fixedly connected to anti-slip pads (3).

3. The SPD testing device with timed self-calibration function according to claim 1, characterized in that: The tester (1) has mounting slots (6) on one side wall and at both ends of the square hole (4). Mounting plates (7) are embedded in the mounting slots (6) and are fixedly connected to the U-shaped plate (5).

4. The SPD testing device with timed self-calibration function according to claim 1, characterized in that: A handle (8) is fixedly connected to one side wall of the U-shaped plate (5) near the center.

5. The SPD testing device with timing self-calibration function according to claim 1, characterized in that: One end of the screw (10) is rotatably connected to the bearing of the U-shaped plate (5), and a motor (12) is embedded and fixedly connected to one side wall of the U-shaped plate (5). The output end of the motor (12) is fixedly connected to one end of the screw (10).

6. The SPD testing device with timed self-calibration function according to claim 1, characterized in that: The surface of the movable plate (9) and near both ends are connected to a limiting rod (11), and both ends of the limiting rod (11) are fixedly connected to the U-shaped plate (5).

7. The SPD testing device with timed self-calibration function according to claim 1, characterized in that: The resistance rod (13) is at the same height as the convex hole (14).

8. The SPD testing device with timed self-calibration function according to claim 1, characterized in that: The bottom of the convex plate (20) is embedded in and adapted to the trapezoidal groove (17).

9. The SPD testing device with timing self-calibration function according to claim 1, characterized in that: A vertical rod (21) passes through the center of each spring (22), and the bottom of each vertical rod (21) passes through the convex plate (20) and is slidably connected to it. Both ends of the vertical rod (21) are fixedly connected to the inner wall of the convex cavity (19).

10. An SPD testing device with timed self-calibration function according to claim 1, characterized in that: The bottom of the convex plate (20) is trapezoidal.

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