A fault detection device for solid-state transformers

Abstract

This invention belongs to the technical field of transformer testing devices, and specifically discloses a fault detection device suitable for solid-state transformers, comprising: a tester body for testing the resistance value of the transformer under test; and a connecting device including wire clamps, clamping blocks, wires, and a grinding assembly. The wire clamps consist of two clamping plates, which are hinged together at the midpoint of their opposite sides by a fixing pin. Torsion springs are connected to both ends of the fixing pin and the two clamping plates. Each of the opposite sides of the two clamping plates has a mounting groove. By incorporating the grinding assembly, this invention allows for the thorough cleaning of oxide layers, oil stains, and impurities on the surface of the output terminal using the grinding block before connection. This eliminates interference from contact resistance on the test results, ensuring the stability of the subsequent electrical connection between the clamping block and the transformer output terminal, and guaranteeing the accuracy of the test results.

Description

Technical Field

[0001] This invention belongs to the technical field of transformer testing devices, and particularly relates to a fault detection device suitable for solid-state transformers. Background Technology

[0002] The solid-state transformer (SST, also known as a power electronic transformer PET) fault detection device is a dedicated hardware and software integrated system for condition monitoring, fault diagnosis, and location of its power electronic devices, high-frequency isolation modules, control systems, and insulation systems. Its core functionality utilizes multi-physical quantity sensors, high-speed data acquisition, and intelligent algorithms to achieve online, real-time, and rapid fault detection and protection for the SST.

[0003] Existing solid-state transformer testing equipment mainly includes insulation resistance testers, DC resistance testers, turns ratio testers, and dielectric loss testers. Among these, the DC resistance tester is primarily used to accurately measure the DC resistance value of inductive equipment such as transformer windings, instrument transformers, and motor coils, and is an essential piece of equipment in solid-state transformer maintenance. When using a DC resistance tester, the current and voltage lines of the tester need to be connected to the same output terminal of the transformer winding via clamps to perform the testing operation. However, when connected via clamps, the transformer output terminals are exposed to the elements for extended periods, leading to oxidation at the output terminals. This affects the stability of the connection between the clamps and the output terminals, ultimately impacting the accuracy of the test results.

[0004] Therefore, it is necessary to invent a fault detection device suitable for solid-state transformers to solve the above problems. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a fault detection device suitable for solid-state transformers, thereby solving one of the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A fault detection device suitable for solid-state transformers, comprising: The tester body is used to test the resistance value of the transformer under test. The connecting device includes a wire clamp, a clamping block, a wire, and a polishing assembly. The wire clamp consists of two clamping plates, which are hinged together at the midpoint of their opposite sides by a fixing pin. Torsion springs are connected to both ends of the fixing pin and the two clamping plates. Each of the opposite sides of the two clamping plates has a mounting groove. The clamping block is installed in the mounting groove, and a reset assembly connects the clamping block to the mounting groove. The wire connects the clamping block to the tester body, enabling electrical connection between them. The polishing assembly is slidably installed in the mounting groove and is used to polish the oxide layer on the surface of the transformer output terminal before connection.

[0007] Furthermore, the clamping block is made of metal, and its two sides are rotatably connected to the two sides of the mounting groove. The reset assembly includes a reset spring and a stop block. The reset spring is connected between the clamping block and the inner wall of the mounting groove, and is used to drive the clamping block to deflect around its connection point with the mounting groove after the clamping block deflects. The stop block is fixedly connected to the side of the clamping block near the reset spring. Both the stop block and the reset spring are located at the end of the clamping block near the wire. When the stop block is pulled by the reset spring and fits against the clamping plate, the clamping block can be completely retracted into the mounting groove.

[0008] Furthermore, the grinding assembly includes a grinding block, a guide block, a limiting block, a magnetic attraction mechanism, and a toggle mechanism. The grinding block is located on the side of the clamping block away from the return spring. There are two guide blocks, each cylindrical, symmetrically fixed to both sides of the grinding block. Slot-shaped guide holes are provided on the inner walls of both sides of the mounting groove, directly opposite the guide blocks. The guide blocks are slidably installed in these guide holes. The limiting blocks are also slidably installed in the guide holes, and each limiting block has an arc-shaped design. The height of the limiting block matches the width of the guide hole. The limiting block has a width smaller than the guide block's diameter. A notch matching the width of the limiting block is provided at the edge of the guide hole, allowing the limiting block to move out of the guide hole through the notch. An arc-shaped stop bar is fixedly connected to the side of the notch away from the clamping block, allowing the limiting block to contact the arc-shaped stop bar. The center of the arc-shaped stop bar coincides with the end of the guide hole near the clamping block. A magnetic attraction mechanism is located on the side of the grinding block near the wire to limit the grinding block. A toggle mechanism is connected between the two grinding blocks to drive the two grinding blocks to move synchronously.

[0009] Furthermore, the magnetic attraction mechanism includes a first magnetic block, a fixing block, and a second magnetic block. The first magnetic block is fixedly connected to the side of the grinding block near the wire. The fixing block is fixedly connected in the mounting groove and is located on the side of the grinding block near the first magnetic block. The second magnetic block fixes the motor on the side of the fixing block near the first magnetic block. The first magnetic block and the second magnetic block are facing each other, and the magnetic poles on the facing sides are opposite.

[0010] Furthermore, the actuating mechanism includes guide rollers, a lever, and a protrusion. There are two guide rollers, which are fixedly connected to the guide blocks on the same side of the two grinding blocks. The lever has two strip holes symmetrically opened along its length direction and are on the same straight line. The two guide rollers are slidably installed in the two strip holes respectively. The protrusion is fixedly connected to the middle position of the lever on the side away from the clamping plate.

[0011] Furthermore, both the side of the grinding block away from the clamping block and the side of the clamping block close to the grinding block are designed with concave arc surfaces. The side of the grinding block close to the clamping block fits together with the concave surface of the clamping block, and several protruding strips are evenly fixedly connected to the concave surface of the grinding block close to the clamping block. The protruding strips are evenly distributed with fluff, and the fluff can fit into the concave surface of the clamping block.

[0012] Furthermore, the clamping plate is made of insulating material, and a rubber pad is fixedly connected to the end of the clamping plate away from the clamping block to increase the contact area between the clamping plate and the operator's fingers.

[0013] Furthermore, a damping pad is fixedly connected to the end of the stop block away from the clamping block. In the initial state, the damping pad can be pressed tightly against the clamping plate under the pulling force of the return spring on the clamping block. At this time, the side of the clamping block away from the return spring is parallel to the side of the clamping plate near the fixing pin.

[0014] Furthermore, an arc-shaped scraper is fixedly connected to the side of the clamp plate near the arc-shaped stop bar. The part of the arc-shaped scraper that contacts the concave surface of the grinding block is composed of several arc-shaped flat surfaces spliced ​​together, and the arc-shaped flat surfaces can fit into the concave surface of the grinding block.

[0015] The technical effects and advantages of this invention are as follows: 1. The present invention, by providing a grinding component, can thoroughly grind and clean the oxide layer, oil stains and impurities on the surface of the output terminal by using a grinding block before connection, thereby eliminating the interference of contact resistance on the test results from the source, ensuring the stability of the subsequent electrical connection between the clamping block and the transformer output terminal, and ensuring the accuracy of the test results. 2. By making the clamping block deflectable, the present invention increases the contact area between the clamping block and the transformer output terminal, thereby allowing the clamping block to fit better with the transformer output terminal, forming a reliable mechanical clamping and conductive connection, and improving the accuracy of subsequent testing.

[0016] It should be understood that both the foregoing general description and the following detailed description are for illustrative purposes and do not necessarily limit the scope of this disclosure. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate the subject matter of this disclosure. Furthermore, the specification and drawings serve to explain the principles of this disclosure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the specific embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation of this application.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an overall schematic diagram of the wire clamp in this invention; Figure 3 In this invention Figure 2 Enlarged view of part A; Figure 4 This is a three-dimensional sectional view of part of the clamping plates in this invention; Figure 5 This is a three-dimensional schematic diagram of the grinding block in this invention.

[0019] In the diagram: 1. Tester body; 2. Clamping block; 3. Wire; 4. Clamping plate; 5. Fixing pin; 6. Torsion spring; 7. Reset spring; 8. Stop block; 9. Grinding block; 10. Guide block; 11. Limiting block; 12. Guide hole; 13. Notch; 14. Arc-shaped stop bar; 15. First magnetic block; 16. Fixing block; 17. Second magnetic block; 18. Guide roller; 19. Toggle bar; 20. Protrusion; 21. Protrusion strip; 22. Rubber pad; 23. Vibration damping pad; 24. Arc-shaped scraper bar. Detailed Implementation

[0020] To make the technical solutions and advantages of the embodiments of this application clearer, the exemplary embodiments of this application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This invention provides, for example Figures 1 to 5The fault detection device for solid-state transformers shown includes: a tester body 1 and a connecting device. The tester body 1 is used to test the resistance value of the transformer under test. The connecting device includes a wire clamp, a clamping block 2, a wire 3, and a grinding assembly. There are two wire clamps, each with two clamping plates 4. The two clamping plates 4 are hinged together at the middle position of their opposite sides by a fixing pin 5. Torsion springs 6 are connected between the two ends of the fixing pin 5 and the two clamping plates 4. Each of the two clamping plates 4 has an installation groove on its opposite side. The clamping block 2 is installed in the installation groove, and a reset assembly is connected between the clamping block 2 and the installation groove. The wire 3 is connected between the clamping block 2 and the tester body 1 to realize the electrical connection between the clamping block 2 and the tester body 1. The grinding assembly is slidably installed in the installation groove to grind the oxide layer on the surface of the transformer output terminal before connection. The clamping block 2 is made of metal. Both sides of the clamping block 2 are rotatably connected to the two sides of the mounting groove. The reset assembly includes a reset spring 7 and a stop block 8. The reset spring 7 is connected between the clamping block 2 and the inner wall of the mounting groove. It is used to drive the clamping block 2 to deflect around the connection point between the clamping block 2 and the mounting groove after the clamping block 2 deflects. The stop block 8 is fixedly connected to the side of the clamping block 2 near the reset spring 7. Both the stop block 8 and the reset spring 7 are located at the end of the clamping block 2 near the wire 3. When the stop block 8 is pulled by the reset spring 7 and is pressed against the clamping plate 4, the clamping block 2 can be completely retracted into the mounting groove. The end of the stop block 8 away from the clamping block 2 is fixedly connected to a vibration damping pad. In the initial state, the vibration damping pad can be pressed against the clamping plate 4 under the pulling force of the reset spring 7 on the clamping block 2. At this time, the side of the clamping block 2 away from the reset spring 7 is parallel to the side of the clamping plate 4 near the fixing pin 5. Before testing, the operator holds the insulating clamp 4 and uses the pre-tightening force of the torsion spring 6 to keep the clamp in its initial closed state. At this time, the clamping block 2 is completely stored in the mounting groove under the pulling force of the reset spring 7. The vibration damping pad is close to the clamp 4, which not only avoids the clamping block 2 from being damaged by bumps when it is not working, but also prevents accidental conduction and ensures operational safety. When wiring testing is required, first move the grinding assembly to the position of clamping block 2 by tossing it. Then, pinch the end of clamping plate 4 to separate the two grinding assemblies. Next, clamp the transformer's output terminal between the two grinding assemblies and rotate the clamp to thoroughly grind and clean the oxide layer, oil, and impurities on the surface of the output terminal. This eliminates the interference of contact resistance on the test results from the source, ensuring the stability of the electrical connection between clamping block 2 and the transformer output terminal, and ensuring the accuracy of the test results. After grinding, first remove the transformer output terminal, then reset the grinding assembly, and then press the end of the clamping plate 4 so that the two clamping blocks 2 can clamp the transformer output terminal under the action of the torsion spring 6. As the clamping block 2 contacts the transformer output terminal, the clamping block 2 can deflect around the connection point with the mounting slot as the axis, so as to better fit with the transformer output terminal and form a reliable mechanical clamping and conductive connection. Then the clamping block 2 can connect the transformer winding to the tester body 1 through the wire 3. The tester body 1 can then accurately collect the DC resistance data of the winding and realize the detection of fault-related resistance values.

[0021] like Figures 2 to 5 As shown, the grinding assembly includes a grinding block 9, a guide block 10, a limiting block 11, a magnetic attraction mechanism, and a toggle mechanism. The grinding block 9 is located on the side of the clamping block 2 away from the return spring 7. There are two guide blocks 10, and each guide block 10 is cylindrical. The two guide blocks 10 are symmetrically fixedly connected to both sides of the grinding block 9. Slot-shaped guide holes 12 are provided on the inner walls of both sides of the mounting groove, directly opposite the guide blocks 10. The guide blocks 10 are slidably installed in the guide holes 12. The limiting blocks 11 are slidably installed in the guide holes 12. The limiting blocks 11 have an arc-shaped design, and their height matches the width of the guide holes 12. The width of 11 is smaller than the diameter of guide block 10. A notch 13 matching the width of limit block 11 is provided at the edge of guide hole 12, and limit block 11 can move out of guide hole 12 through notch 13. An arc-shaped stop bar 14 is fixedly connected to the side of notch 13 away from clamping block 2. Limit block 11 can contact arc-shaped stop bar 14, and the center of arc-shaped stop bar 14 coincides with the position of the end of guide hole 12 near clamping block 2. Magnetic attraction mechanism is set on the side of grinding block 9 near wire 3 to limit grinding block 9. A toggle mechanism is connected between two grinding blocks 9 to drive the two grinding blocks 9 to move synchronously. The actuation mechanism includes guide rollers 18, levers 19, and protrusions 20. There are two guide rollers 18, which are fixedly connected to guide blocks 10 on the same side of the two grinding blocks 9. Two strip holes are symmetrically opened on the lever 19 along its length direction and are on the same straight line. The two guide rollers 18 are slidably installed in the two strip holes respectively. The protrusions 20 are fixedly connected to the middle position of the lever 19 on the side away from the clamping plate 4. When connecting the transformer's output terminal, if an oxide layer is observed on the surface of the transformer's output terminal, the protrusion 20 on the lever 19 can be pushed first. Under the drive of the protrusion 20, the lever 19 drives the two guide rollers 18 to move synchronously along the guide hole 12 towards the clamping block 2 through the strip hole. During this process, the guide block 10 and the limiting block 11 can cooperate to restrict the grinding block 9, so that the grinding block 9 can always remain parallel to the clamping block 2. When the guide block 10 moves to the notch 13 position, since the width of the notch 13 is smaller than the diameter of the guide block 10, the guide block 10 can continue to move along the guide hole 12. When the guide block 10 moves to the end of the guide hole 12, the limiting block 11 also moves to the notch 13 position. At this time, the grinding block 9 can fit together with the clamping block 2. When grinding the transformer output terminal, the ends of the two clamping plates 4 can be pinched to open the front ends of the two clamping plates 4. Then, the output terminal of the transformer is placed between the two grinding blocks 9. Then, the ends of the clamping plates 4 are released so that the clamping plates 4 can clamp the output terminal of the transformer through the two grinding blocks 9 under the action of the torsion spring 6. Then, the clamp is rotated to drive the two grinding blocks 9 to perform circular grinding on the output terminal of the transformer, thereby removing the oxide layer on the surface of the output terminal of the transformer, thereby improving the stability of the connection between the clamping block 2 and the output terminal of the transformer and ensuring the accuracy of the test results. Furthermore, during the process of clamping the transformer's output terminal with the two grinding blocks 9, the grinding blocks 9 can deflect around the guide block 10 as an axis under the pressure of the transformer's output terminal. As the grinding blocks 9 deflect, the limiting block 11 can rotate out of the guide hole 12 through the notch 13 and slide along the arc-shaped stop bar 14. The clamping block 2 can adaptively deflect at its connection point with the mounting groove under the pressure of the grinding blocks 9. During this process, the return spring 7 can be gradually stretched to meet the deflection requirements of the clamping block 2. As the grinding blocks 9 deflect, the grinding blocks 9 can better fit together with the transformer's output terminal, thereby improving the grinding effect on the transformer's output terminal. After grinding is completed, as the ends of the two clamping plates 4 are squeezed again, the two grinding blocks 9 can release their clamping effect on the transformer output terminal. Since the grinding blocks 9 are no longer subjected to the squeezing force of the transformer output terminal, the return spring 7 can drive the clamping block 2 to reset. As the clamping block 2 resets, the grinding block 9 can also reset under the action of the clamping block 2, so that the limiting block 11 can re-enter the guide hole 12 along the notch 13, and then push the protrusion 20 on the lever 19 to drive the grinding block 9 to reset, so as not to obstruct the clamping block 2.

[0022] like Figures 2 to 5As shown, the magnetic attraction mechanism includes a first magnetic block 15, a fixing block 16, and a second magnetic block 17. The first magnetic block 15 is fixedly connected to the side of the grinding block 9 near the wire 3. The fixing block 16 is fixedly connected in the mounting groove and is located on the side of the grinding block 9 near the first magnetic block 15. The second magnetic block 17 fixes the motor on the side of the fixing block 16 near the first magnetic block 15. The first magnetic block 15 and the second magnetic block 17 are facing each other, but the magnetic poles on the facing sides are opposite. By providing a magnetic attraction mechanism, when the grinding block 9 is not in use, the first magnetic block 15 on the grinding block 9 can be attracted together with the second magnetic block 17 on the fixing block 16, thereby restricting the grinding block 9 and preventing it from shaking randomly.

[0023] like Figure 5 As shown, the side of the grinding block 9 away from the clamping block 2 and the side of the clamping block 2 close to the grinding block 9 are both designed with concave arc surfaces. The side of the grinding block 9 close to the clamping block 2 is in contact with the concave surface of the clamping block 2. Several protrusions 21 are evenly fixedly connected to the concave surface of the grinding block 9 close to the clamping block 2. The protrusions 21 are evenly distributed with fluff, and the fluff can fit in contact with the concave surface of the clamping block 2.

[0024] With the convex strip 21 provided, when the grinding block 9 slides against the clamping block 2, the convex strip 21 on the grinding block 9 can clean the concave surface of the clamping block 2, and the fibers on the convex strip 21 can absorb fine dust and grinding debris, thereby keeping the contact surface between the clamping block 2 and the transformer output terminal clean, thus ensuring the stability of the electrical connection between the two.

[0025] like Figure 1 and Figure 2 As shown, the clamp 4 is made of insulating material, and a rubber pad 23 is fixedly connected to the end of the clamp 4 away from the clamping block 2. This is used to increase the contact area between the clamp 4 and the operator's fingers. The rubber pad 23 at the end of the clamp 4 increases the contact area between the fingers and the clamp 4, improving grip stability. At the same time, the insulating material of the clamp 4 can prevent the operator from getting an electric shock and ensure operational safety.

[0026] like Figure 3 and Figure 4 As shown, a curved scraper 24 is fixedly connected to the side of the clamping plate 4 near the curved stop bar 14. The part of the curved scraper 24 that contacts the concave surface of the grinding block 9 is made up of several curved surface strips spliced ​​together, and the curved surface strips can fit into the concave surface of the grinding block 9. During the resetting process of the grinding block 9 along the guide hole 12, the arc-shaped scraper 24 can clean the grinding block 9 to prevent the metal oxide layer after grinding from remaining on the grinding block 9, thus ensuring the grinding effect of the grinding block 9 in the future.

[0027] Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this disclosure.

[0028] In the description of this disclosure, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0030] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0031] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A fault detection device suitable for solid-state transformers, characterized in that, include: The tester body (1) is used to test the resistance value of the transformer under test; The connecting device includes a wire clamp, a clamping block (2), a wire (3), and a polishing assembly. There are two wire clamps, each consisting of two clamping plates (4). The two clamping plates (4) are hinged together at the middle position of their opposite sides by a fixing pin (5). Torque springs (6) are connected between the two ends of the fixing pin (5) and the two clamping plates (4). A mounting groove is provided on the opposite side of each of the two clamping plates (4). The clamping block (2) is installed in the mounting groove, and a reset assembly is connected between the clamping block (2) and the mounting groove. The wire (3) is connected between the clamping block (2) and the tester body (1) to achieve an electrical connection between the clamping block (2) and the tester body (1). The polishing assembly is slidably installed in the mounting groove to polish the oxide layer on the surface of the transformer output terminal before connection.

2. The fault detection device for solid-state transformers according to claim 1, characterized in that: The clamping block (2) is made of metal. The two sides of the clamping block (2) are rotatably connected to the two sides of the mounting groove. The reset assembly includes a reset spring (7) and a stop block (8). The reset spring (7) is connected between the clamping block (2) and the inner wall of the mounting groove. It is used to drive the clamping block (2) to deflect with its connection point with the mounting groove as the axis after the clamping block (2) deflects. The stop block (8) is fixedly connected to the side of the clamping block (2) near the reset spring (7). The stop block (8) and the reset spring (7) are both located at the end of the clamping block (2) near the wire (3). When the stop block (8) is pulled by the reset spring (7) and fits against the clamping plate (4), the clamping block (2) can be completely retracted into the mounting groove.

3. The fault detection device for solid-state transformers according to claim 2, characterized in that: The polishing assembly includes a polishing block (9), a guide block (10), a limiting block (11), a magnetic attraction mechanism, and a toggle mechanism. The polishing block (9) is located on the side of the clamping block (2) away from the return spring (7). There are two guide blocks (10), and each guide block (10) is cylindrical. The two guide blocks (10) are symmetrically fixedly connected to both sides of the polishing block (9). The inner walls of both sides of the mounting groove are provided with strip-shaped guide holes (12) opposite to the guide blocks (10). The guide blocks (10) are slidably installed in the guide holes (12). The limiting blocks (11) are slidably installed in the guide holes (12). The limiting blocks (11) are arc-shaped, and the height of the limiting blocks (11) matches the width of the guide holes (12). The width of the positioning block (11) is smaller than the diameter of the guide block (10). A notch (13) matching the width of the positioning block (11) is provided at the edge of the guide hole (12), and the positioning block (11) can move out of the guide hole (12) through the notch (13). An arc-shaped stop bar (14) is fixedly connected to the side of the notch (13) away from the clamping block (2). The positioning block (11) can contact the arc-shaped stop bar (14), and the center of the arc-shaped stop bar (14) coincides with the position of the end of the guide hole (12) near the clamping block (2). The magnetic attraction mechanism is set on the side of the grinding block (9) near the wire (3) to limit the grinding block (9). The actuating mechanism is connected between the two grinding blocks (9) to drive the two grinding blocks (9) to move synchronously.

4. The fault detection device for solid-state transformers according to claim 3, characterized in that: The magnetic attraction mechanism includes a first magnetic block (15), a fixing block (16), and a second magnetic block (17). The first magnetic block (15) is fixedly connected to the grinding block (9) on the side near the wire (3). The fixing block (16) is fixedly connected in the mounting groove and is located on the side of the grinding block (9) near the first magnetic block (15). The second magnetic block (17) fixes the motor on the side of the fixing block (16) near the first magnetic block (15). The first magnetic block (15) and the second magnetic block (17) are facing each other, and the magnetic poles on the opposite sides of the two are opposite.

5. The fault detection device for solid-state transformers according to claim 4, characterized in that: The actuation mechanism includes guide rollers (18), levers (19), and protrusions (20). There are two guide rollers (18), which are fixedly connected to guide blocks (10) on the same side of the two grinding blocks (9). The lever (19) has two strip holes symmetrically opened along its length direction on the same straight line. The two guide rollers (18) are slidably installed in the two strip holes respectively. The protrusions (20) are fixedly connected to the middle position of the lever (19) away from the clamping plate (4).

6. The fault detection device for solid-state transformers according to claim 5, characterized in that: The grinding block (9) on the side away from the clamping block (2) and the side of the clamping block (2) near the grinding block (9) are both designed with concave arc surfaces. The side of the grinding block (9) near the clamping block (2) is in contact with the concave surface of the clamping block (2). Several protruding strips (21) are evenly fixedly connected on the concave surface of the grinding block (9) near the clamping block (2). The protruding strips (21) are evenly distributed with fluff, and the fluff can fit in contact with the concave surface of the clamping block (2).

7. The fault detection device for solid-state transformers according to claim 6, characterized in that: The clamp (4) is made of insulating material, and a rubber pad (23) is fixedly connected to the end of the clamp (4) away from the clamping block (2) to increase the contact area between the clamp (4) and the operator's fingers.

8. The fault detection device for solid-state transformers according to claim 7, characterized in that: The end of the stop block (8) away from the clamping block (2) is fixedly connected to a damping pad. In the initial state, the damping pad can stick to the clamping plate (4) under the pulling force of the return spring (7) on the clamping block (2). At this time, the side of the clamping block (2) away from the return spring (7) is parallel to the side of the clamping plate (4) near the fixing pin (5).

9. The fault detection device for solid-state transformers according to claim 8, characterized in that: The clamp (4) is fixedly connected to an arc-shaped scraper (24) on the side near the arc-shaped stop bar (14). The part of the arc-shaped scraper (24) that contacts the concave surface of the grinding block (9) is made of several arc-shaped strips spliced ​​together, and the arc-shaped strips can fit into the concave surface of the grinding block (9).

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