A direct current resistance detection device of an intelligent sensing type solid state transformer

Abstract

The application relates to the technical field of transformer detection, in particular to a direct-current resistance detection device for an intelligent sensing type solid-state transformer, which comprises a control panel arranged on a detection box, an installation cavity arranged in the detection box, detection lines and sensors arranged in the installation cavity, the detection lines comprising two groups of installation plates arranged in the installation cavity, one group of installation plates being electrically connected with the detection box through a negative electrode sheet and a negative conductive sheet, the other group of installation plates being electrically connected with the detection box through a positive electrode sheet and a positive conductive sheet, the negative electrode sheet and the positive electrode sheet both being in communication with plug-in modules on the control panel, a switching assembly being arranged on the installation plate, the switching assembly being controlled by the control panel and the sensors, the switching assembly being capable of driving a conductive piece arranged on the installation plate to displace, so that the plug-in modules can automatically switch between two power supply modes of being connected with a built-in loop in the detection box and being connected with an external power supply, thereby external power supply is used to rapidly charge the solid-state transformer, so that the detection time is shortened, and the service life of the device is prolonged.

Description

Technical Field

[0001] This invention relates to the field of transformer testing technology, specifically to a smart sensing-type DC resistance testing device for solid-state transformers. Background Technology

[0002] With the rapid development of smart grids and power electronics technology, solid-state transformers, as a new type of power electronic device that integrates high-frequency transformers, power semiconductor devices and advanced control algorithms, have been widely used in new energy grid connection, electric vehicle charging and flexible power distribution systems.

[0003] Solid-state transformers contain a large number of power electronic components and complex winding structures. Before leaving the factory, the DC resistance parameters of solid-state transformers need to be measured to ensure the quality of the equipment. Furthermore, during subsequent operation, the DC resistance needs to be tested to evaluate the operating conditions of solid-state transformers or to troubleshoot them.

[0004] Currently, the DC resistance of transformers is typically tested using the bridge method or voltage drop method, with the aid of portable DC resistance testing devices. However, solid-state transformers are large inductive loads. When charging the windings with a DC voltage, the current rises to a stable value very slowly due to the large time constant (τ=L / R). When using the built-in battery or dry cell battery of the portable testing device, the charging process often takes several minutes or even tens of minutes due to the limitations of the built-in power supply's capacity and output voltage level. This long waiting time greatly reduces the efficiency of on-site inspections and batch testing. Furthermore, during the charging process using the built-in battery, the built-in circuit of the testing device needs to withstand a large current surge, which accelerates the aging of electronic components and shortens the device's lifespan. Summary of the Invention

[0005] The purpose of this invention is to provide a DC resistance detection device for an intelligent sensing solid-state transformer to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A DC resistance detection device for an intelligent sensing solid-state transformer includes: A control panel is installed on the detection box, and an installation cavity is formed inside the detection box, in which detection lines and intelligent sensors are arranged; The detection circuit includes two sets of mounting plates disposed in the mounting cavity. One set of mounting plates is electrically connected to the detection box through a negative electrode plate and a negative conductive plate, and the other set of mounting plates is electrically connected to the detection box through a positive electrode plate and a positive conductive plate. Both the negative electrode plate and the positive electrode plate are connected to the plug-in module disposed on the control panel. The mounting plate is equipped with a switching component, which is controlled by the control panel and the intelligent sensor. The switching component can drive the conductive parts that are movably mounted on the mounting plate to move, so that the plug-in module can automatically switch between two power supply modes: connecting to the built-in circuit of the detection box and connecting to an external power supply.

[0007] The DC resistance detection device for the intelligent sensing solid-state transformer described above: the switching component includes a longitudinal member, which is mounted on the mounting plate, and a drive rod is rotatably mounted on the longitudinal member. One end of the drive rod is provided with a drive element, which cooperates with the switching member disposed in the mounting cavity to drive the drive rod to rotate relative to the longitudinal member. The other end of the drive rod is connected to the conductive member through a linkage element. With the cooperation of the linkage element, the drive rod can drive the conductive member to move.

[0008] The DC resistance detection device for the intelligent sensing solid-state transformer described above: the switching component includes a bidirectional cylinder, which is installed in the mounting cavity and electrically connected to the intelligent sensor. Both ends of the bidirectional cylinder are equipped with insertion rods, and protrusions are formed on the outer wall of the insertion rods.

[0009] The DC resistance detection device for the intelligent sensing solid-state transformer described above: the driving component includes a plug-in cylinder, the plug-in cylinder is coaxially arranged with the driving rod, and the inner wall of the plug-in cylinder is provided with a spiral groove, the spiral groove extends along the circumference of the plug-in cylinder, the spiral helix angle is 90°, and the protrusion is slidably embedded in the spiral groove.

[0010] The DC resistance detection device for the intelligent sensing solid-state transformer described above: the conductive element includes a switching electrode, and two sets of mounting blocks are respectively arranged on the left and right sides of the switching electrode. A slider is rotatably mounted on the mounting block, and the slider slides in cooperation with a guide structure arranged on the mounting plate. Under the restriction of the guide structure, the switching electrode can only move along a fixed trajectory.

[0011] The DC resistance detection device for the intelligent sensing solid-state transformer described above: the guiding structure includes horizontal guide rails mounted on the mounting plate, and two sets of horizontal guide rails are symmetrically arranged along the width direction of the mounting plate, with each set of horizontal guide rails having a vertical guide rail.

[0012] The DC resistance detection device for the intelligent sensing solid-state transformer described above has the following features: a positioning groove is provided on the side of the horizontal guide rail near the longitudinal member, the positioning groove is adapted to the fixing rod provided on the switching electrode, and a clearance slope is provided on the side of the positioning groove near the vertical guide rail; a locking groove adapted to the fixing rod is provided on the side of the vertical guide rail near the longitudinal member, and a clearance surface is provided on the side of the locking groove near the horizontal guide rail.

[0013] The DC resistance detection device for the intelligent sensing solid-state transformer described above: the linkage includes a connecting rod, one end of which is connected to the driving rod, and the other end is provided with a sleeve ring, which is rotatably connected to the fixed rod.

[0014] The DC resistance detection device for the intelligent sensing solid-state transformer described above: a wiring electrode plate is also provided in the mounting cavity. The wiring electrode plate is connected to the external interface provided on the outside of the detection box. The external interface is covered in the external auxiliary box. The external auxiliary box is installed on the outer wall of the detection box. The wiring electrode plate is connected to the external negative electrode plate and the external positive electrode plate provided in the mounting cavity through two sets of wires respectively.

[0015] The DC resistance detection device for the intelligent sensing solid-state transformer described above: the mounting plate is further provided with an internal electrode plate, the internal electrode plate is electrically connected to the terminal block mounted on the mounting plate, the switching electrode is electrically connected to the conductive post mounted on the mounting plate, and the terminal block and the conductive post are respectively electrically connected to the built-in circuit of the detection box through wires.

[0016] Compared with the prior art, the beneficial effects of the present invention are: By setting up a switching component, a two-way cylinder, and a guide structure, the two-way cylinder drives the protrusion and the threaded groove to rotate the drive rod in a directional manner, thereby causing the switching electrode to deflect in a directional manner. During the deflection process, the guide structure composed of the horizontal guide rail and the vertical guide rail enables the switching electrode to switch between horizontal and vertical states. During the switching process, the positioning groove on the horizontal guide rail and the locking groove on the vertical guide rail are engaged with the fixing rod on the switching electrode, which makes the switching of the switching electrode between the two states more certain and reliable. At the same time, it can resist vibration and prevent loosening, avoid contact resistance fluctuations caused by partial contact, arcing or position drift, and improve the consistency and repeatability of DC resistance testing. Meanwhile, by setting an external enclosure on the outside of the test box, the external enclosure can protect the external interface, and when the external enclosure is opened, the large-capacity DC power supply located on the outside of the test box can be used as a bridge power supply through the external interface. With the help of intelligent sensors and electrical connections between the control module and the bidirectional cylinder, the solid-state transformer can automatically switch between two modes: built-in detection circuit and external power supply. Without changing the final DC resistance detection architecture, the solid-state transformer can be charged by an external high-capacity DC power supply, which can quickly and steadily raise the current flowing inside the solid-state transformer to the target stable value. Then, the solid-state transformer is automatically switched to connect with the detection circuit inside the detection box to complete the measurement. The overall detection time is shortened, which improves the problem of "slow charging of large inductance / large capacity solid-state transformer windings and difficulty in stabilizing the current quickly". Furthermore, during the charging process described above, the built-in circuit of the detection box is in standby mode, and the current does not pass through the detection circuit. Therefore, it can reduce the current surge and thermal shock inside the detection box, thereby improving the long-term operational stability and service life of the device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a DC resistance detection device for an intelligent sensing solid-state transformer. Figure 2 This is a schematic diagram of the other side of the DC resistance detection device for an intelligent sensing solid-state transformer. Figure 3 This is a schematic diagram of the side structure of the detection box in the DC resistance detection device for an intelligent sensing solid-state transformer. Figure 4 This is a schematic diagram of the internal mounting cavity of the detection box in the DC resistance detection device for an intelligent sensing solid-state transformer. Figure 5 A schematic diagram of the internal detection circuitry in the mounting cavity of a DC resistance detection device for an intelligent sensing solid-state transformer. Figure 6 This is a schematic diagram of the structure between the detection circuit and the switching components in the DC resistance detection device for an intelligent sensing solid-state transformer. Figure 7 This is a schematic diagram showing the connection between the mounting plate and the built-in circuit of the detection box in a DC resistance detection device for an intelligent sensing solid-state transformer. Figure 8 This is a schematic diagram of the switching component on the mounting plate in the DC resistance detection device for an intelligent sensing solid-state transformer. Figure 9 A schematic diagram of the guiding structure in a DC resistance detection device for an intelligent sensing solid-state transformer; Figure 10 This is a schematic diagram of the conductive element in a DC resistance detection device for an intelligent sensing solid-state transformer. Figure 11 This is a schematic diagram of the structure of the switching component and the driving component in the DC resistance detection device of the intelligent sensing solid-state transformer.

[0018] In the diagram: 1. Detection box; 101. Mounting cavity; 2. Control panel; 201. Wiring module; 202. Control module; 3. Outer enclosure; 4. External interface; 5. Intelligent sensor; 6. Wiring electrode; 701. Negative electrode; 702. Negative conductive plate; 801. Positive electrode; 802. Positive conductive plate; 9. Mounting plate; 1001. External negative electrode; 1002. External positive electrode; 11. Two-way cylinder; 12. Vertical guide rail; 13. Horizontal guide rail ; 14. Inner electrode plate; 1401. Terminal post; 15. Conductive post; 16. Longitudinal component; 17. Outer electrode plate; 18. Locking groove; 1801. Clearance surface; 19. Positioning groove; 1901. Clearance slope; 20. Switching electrode; 21. Mounting block; 22. Slider; 23. Fixing rod; 24. Drive rod; 25. Sleeve ring; 2501. Connecting rod; 26. Insertion sleeve; 2601. Spiral groove; 27. Insertion rod; 2701. Protrusion. Detailed Implementation

[0019] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0020] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0021] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented even without certain specific details. In some instances, methods, means, and elements well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0022] Please see Figures 1-11 In this embodiment of the invention, a DC resistance detection device for an intelligent sensing solid-state transformer includes: A control panel 2 is installed on the detection box 1. An installation cavity 101 is formed inside the detection box 1. Detection lines and intelligent sensors 5 are arranged inside the installation cavity 101. Specifically, please refer to Figure 1 , Figure 2 , Figure 3 The control panel 2 is equipped with a wiring module 201 and a control module 202. The wiring module 201 is electrically connected to the solid-state transformer under test via wires. After the connection is completed, the control module 202 can control the test box 1 to enter the working state and perform DC resistance detection on the connected solid-state transformer.

[0023] For details, please refer to Figures 3-7 The detection circuit includes two sets of mounting plates 9 disposed in the mounting cavity 101. One set of mounting plates 9 is electrically connected to the detection box 1 through a negative electrode plate 701 and a negative conductive plate 702. The other set of mounting plates 9 is electrically connected to the detection box 1 through a positive electrode plate 801 and a positive conductive plate 802. Both the negative electrode plate 701 and the positive electrode plate 801 are connected to the wiring module 201 disposed on the control panel 2. The mounting cavity 101 is also provided with a wiring electrode plate 6, which is in communication with the external interface 4 located on the outside of the detection box 1. The external interface 4 is covered inside the outer auxiliary box 3, which is installed on the outer wall of the detection box 1. The wiring electrode plate 6 is connected to the external negative electrode plate 1001 and the external positive electrode plate 1002 located in the mounting cavity 101 respectively through two sets of wires. (See reference...) Figure 8 Both the external negative electrode 1001 and the external positive electrode 1002 are provided with external electrode plates 17. The external electrode plates 17 cooperate with the conductive components to enable the plug-in module 201 to be connected to the external power supply. Preferably, the outer casing 3 is equipped with a flip-top cover. When the flip-top cover can be closed, it can protect the external interface 4. During operation, the flip-top cover is opened, and the device is connected to an external power supply located outside the detection box 1 via wires. During subsequent testing, the external power supply can charge the connected solid-state transformer through wires, external interface 4, connecting electrode plate 6, external negative electrode plate 1001, and external positive electrode plate 1002. Compared with the traditional method of direct charging using the internal dry battery of the detection box 1, this method of charging with an external high-capacity DC power supply, using an external power supply as a bridge power supply, can quickly drive the current to rise stably, resulting in a shorter charging time and shortening the testing time. Furthermore, during the charging process, the detection box 1 is in standby mode, which can reduce current surges and thermal shocks within the detection box 1, thereby extending the service life of the device.

[0024] Further, please refer to Figures 4-11 The mounting plate 9 is provided with a switching component, which is controlled by the control panel 2 and the intelligent sensor 5. It can drive the conductive part that is movably set on the mounting plate 9 to move, so that the plug module 201 can automatically switch between two power supply modes: connecting to the built-in circuit of the detection box 1 and connecting to an external power supply. The switching assembly includes a longitudinal member 16, which is mounted on the mounting plate 9. A drive rod 24 is rotatably mounted on the longitudinal member 16. One end of the drive rod 24 is provided with a drive member, which cooperates with the switching member disposed in the mounting cavity 101 to drive the drive rod 24 to rotate relative to the longitudinal member 16. The other end of the drive rod 24 is connected to the conductive member through a linkage member. With the cooperation of the linkage member, the drive rod 24 can drive the conductive member to move. The switching component includes a bidirectional cylinder 11, which is installed in the mounting cavity 101 and electrically connected to the smart sensor 5. Both ends of the bidirectional cylinder 11 are equipped with insertion rods 27, and protrusions 2701 are formed on the outer wall of the insertion rods 27. Specifically, the aforementioned intelligent sensor 5 is communicatively connected to the control module 202, and the intelligent sensor 5 can monitor the current flowing in the solid-state transformer connected to the wiring module 201 in real time. When the current value in the solid-state transformer steadily rises to a preset value, the intelligent sensor 5 sends a signal to the control module 202, and then the control module 202 issues a command to the bidirectional cylinder 11 so that the driving component can drive the conducting component to switch positions.

[0025] The driving component includes a plug-in cylinder 26, which is coaxially arranged with the driving rod 24. The inner wall of the plug-in cylinder 26 is provided with a spiral groove 2601, which extends circumferentially along the plug-in cylinder 26 and has a spiral helix angle of 90°. The protrusion 2701 is slidably embedded in the spiral groove 2601. It should be noted that the aforementioned longitudinal component 16, drive rod 24, plug-in cylinder 26, and insertion rod 27 are all made of insulating material to reduce electromagnetic interference during operation.

[0026] The conductive component includes a switching electrode 20. Two sets of mounting blocks 21 are respectively provided on the left and right sides of the switching electrode 20. A slider 22 is rotatably mounted on the mounting block 21. The slider 22 is slidably engaged with the guide structure provided on the mounting plate 9. Under the restriction of the guide structure, the switching electrode 20 can only move along a fixed trajectory. The mounting plate 9 is also provided with an internal electrode plate 14, which is electrically connected to a terminal block 1401 mounted on the mounting plate 9. The switching electrode 20 is electrically connected to a conductive post 15 mounted on the mounting plate 9, and the terminal block 1401 and the conductive post 15 are respectively electrically connected to the built-in circuit of the detection box 1 through wires. Specifically, the aforementioned switching electrode 20 and conductive post 15 are electrically connected through electromagnetic induction or electromagnetic resonance, enabling the two structures to achieve electrical connection without the need for wires.

[0027] The guide structure includes a horizontal guide rail 13 mounted on the mounting plate 9. Two sets of horizontal guide rails 13 are symmetrically arranged along the width direction of the mounting plate 9. Each set of horizontal guide rails 13 is provided with a vertical guide rail 12. For details, please refer to Figure 10 The two sets of sliders 22 near the inner electrode plate 14 of the aforementioned switching electrode 20 are connected to the vertical guide rail 12 so that the switching electrode 20 can be changed in position later.

[0028] A positioning groove 19 is provided on the side of the horizontal guide rail 13 near the longitudinal member 16. The positioning groove 19 is adapted to the fixing rod 23 provided on the switching electrode 20. The positioning groove 19 is provided with a clearance slope 1901 on the side near the vertical guide rail 12. The vertical guide rail 12 near the longitudinal member 16 has a locking groove 18 on its slope side that is adapted to the fixing rod 23. The locking groove 18 is provided with a clearance surface 1801 on the side near the horizontal guide rail 13. The linkage includes a connecting rod 2501, one end of which is connected to the drive rod 24, and the other end is provided with a sleeve ring 25, which is rotatably connected to the fixed rod 23. Please see Figures 8-11 In the initial state, the switching electrode 20 is connected to the inner electrode plate 14 under the constraint of the guiding structure; At this time, the solid-state transformer is connected to the built-in circuit of the detection box 1, the bidirectional cylinder 11 is in the retracted state, and the protrusion 2701 is located at the end of the stroke of the spiral groove 2601 away from the longitudinal member 16. The fixing rod 23 engages with the positioning groove 19 to lock the position of the switching electrode 20 so that the switching electrode 20 is stably connected to the inner electrode plate 14. In summary, after the solid-state transformer is connected, the control module 202 drives the bidirectional cylinder 11 to extend. During this process, the bidirectional cylinder 11 pushes the two sets of insertion rods 27 along the axial direction of the drive rod 24 towards the two sets of longitudinal members 16 respectively. At this time, the contact compression generated by the protrusion 2701 on the groove wall of the spiral groove 2601 can force the insertion cylinder 26 to drive the drive rod 24 to rotate counterclockwise (in conjunction with...). Figure 8 , Figure 11 describe); Next, the counterclockwise rotating drive rod 24, in cooperation with the connecting rod 2501 and the sleeve ring 25, drives the fixed rod 23 to deflect the switching electrode 20. At the same time, with the cooperation of the avoidance slope 1901, the fixed rod 23 smoothly disengages from the avoidance slope 1901, the switching electrode 20 separates from the inner electrode plate 14, and under the constraint of the slider 22 and the vertical guide rail 12, it deflects in a direction away from the mounting plate 9 until the bidirectional cylinder 11 stops operating, at which point the protrusion 2701 moves to the spiral groove 2. At the end of the stroke of 601, the drive rod 24 rotates 90°, causing the switching electrode 20 to change from a horizontal state to a vertical state and connect with the external electrode plate 17. At this time, the solid-state transformer connected to the plug-in module 201 is connected to the external high-capacity power supply. With the cooperation of the clearance surface 1801, the fixing rod 23 smoothly engages with the locking groove 18. During this process, the locking groove 18 and the positioning groove 19 can prevent contact resistance fluctuations caused by partial contact, arcing or position drift. Subsequently, the external power supply charges the solid-state transformer until the smart sensor 5 detects that the current flowing inside the solid-state transformer reaches a preset value. Then, the smart sensor 5 sends a command to the control module 202 so that the control module 202 drives the bidirectional cylinder 11 to reset. During this process, the drive rod 24 reverses, forcing the switching electrode 20 to separate from the external electrode plate 17 and switch back to the horizontal state, connecting with the internal electrode plate 14. After the bidirectional cylinder 11 returns to the initial position, the control module 202 drives the built-in circuit in the detection box 1 to work, performing DC resistance detection on the connected solid-state transformer. After the detection is completed, the detection box 1 automatically shuts off the power.

[0029] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0030] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A DC resistance detection device for an intelligent sensing solid-state transformer, comprising: A control panel (2) is set on the detection box (1), and an installation cavity (101) is formed inside the detection box (1). Detection lines and smart sensors (5) are arranged inside the installation cavity (101). Its features are: The detection circuit includes two sets of mounting plates (9) disposed in the mounting cavity (101). One set of mounting plates (9) is electrically connected to the detection box (1) through a negative electrode plate (701) and a negative conductive plate (702). The other set of mounting plates (9) is electrically connected to the detection box (1) through a positive electrode plate (801) and a positive conductive plate (802). Both the negative electrode plate (701) and the positive electrode plate (801) are connected to the wiring module (201) disposed on the control panel (2). The mounting plate (9) is provided with a switching component, which is controlled by the control panel (2) and the intelligent sensor (5). It can drive the conductive part that is movably set on the mounting plate (9) to move, so that the plug module (201) can automatically switch between two modes: connecting to the built-in circuit of the detection box (1) and connecting to an external power supply. The switching assembly includes a longitudinal member (16), which is mounted on the mounting plate (9). A drive rod (24) is rotatably mounted on the longitudinal member (16). One end of the drive rod (24) is provided with a drive member. The drive member cooperates with the switching member provided in the mounting cavity (101) and can drive the drive rod (24) to rotate relative to the longitudinal member (16). The other end of the drive rod (24) is connected to the conductor through a linkage member. With the cooperation of the linkage member, the drive rod (24) can drive the conductor to move. The conductive component includes a switching electrode (20). Two sets of mounting blocks (21) are respectively provided on the left and right sides of the switching electrode (20). A slider (22) is rotatably mounted on the mounting block (21). The slider (22) slides in cooperation with the guide structure provided on the mounting plate (9). Under the restriction of the guide structure, the switching electrode (20) can only move along a fixed trajectory.

2. The DC resistance detection device for an intelligent sensing solid-state transformer according to claim 1, characterized in that, The switching component includes a bidirectional cylinder (11), which is installed in the mounting cavity (101) and electrically connected to the smart sensor (5). Both ends of the bidirectional cylinder (11) are equipped with insertion rods (27), and protrusions (2701) are formed on the outer wall of the insertion rods (27).

3. The DC resistance detection device for an intelligent sensing solid-state transformer according to claim 2, characterized in that, The driving component includes a plug tube (26), which is coaxially arranged with the driving rod (24). The inner wall of the plug tube (26) is provided with a spiral groove (2601), which extends circumferentially along the plug tube (26) with a spiral helix angle of 90°. The protrusion (2701) is slidably embedded in the spiral groove (2601).

4. The DC resistance detection device for an intelligent sensing solid-state transformer according to claim 1, characterized in that, The guide structure includes a horizontal guide rail (13) mounted on the mounting plate (9). Two sets of the horizontal guide rail (13) are symmetrically arranged along the width direction of the mounting plate (9). Each set of the horizontal guide rail (13) is provided with a vertical guide rail (12).

5. The DC resistance detection device for an intelligent sensing solid-state transformer according to claim 4, characterized in that, A positioning groove (19) is provided on the side of the horizontal guide rail (13) near the longitudinal member (16). The positioning groove (19) is adapted to the fixing rod (23) provided on the switching electrode (20). A clearance slope (1901) is provided on the side of the positioning groove (19) near the vertical guide rail (12). A locking groove (18) adapted to the fixing rod (23) is provided on the side of the vertical guide rail (12) near the longitudinal member (16). A clearance surface (1801) is provided on the side of the locking groove (18) near the horizontal guide rail (13).

6. The DC resistance detection device for an intelligent sensing solid-state transformer according to claim 5, characterized in that, The linkage includes a connecting rod (2501), one end of which is connected to the drive rod (24), and the other end is provided with a sleeve ring (25), which is rotatably connected to the fixed rod (23).

7. The DC resistance detection device for an intelligent sensing solid-state transformer according to claim 1, characterized in that, The mounting cavity (101) is also provided with a wiring electrode piece (6), which is connected to the external interface (4) located on the outside of the detection box (1). The external interface (4) is covered in the outer auxiliary box (3), which is installed on the outer wall of the detection box (1). The wiring electrode piece (6) is connected to the external negative electrode piece (1001) and the external positive electrode piece (1002) located in the mounting cavity (101) through two sets of wires.

8. The DC resistance detection device for an intelligent sensing solid-state transformer according to claim 4, characterized in that, The mounting plate (9) is also provided with an internal electrode plate (14), which is electrically connected to the terminal block (1401) installed on the mounting plate (9). The switching electrode (20) is electrically connected to the conductive post (15) installed on the mounting plate (9). The terminal block (1401) and the conductive post (15) are respectively electrically connected to the built-in circuit of the detection box (1) through wires.

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