A transformer test terminal box

Abstract

The utility model relates to transformer testing equipment technical field especially is concerned with a kind of transformer test terminal box, including terminal box body, the terminal box body is equipped with multiple binding posts;First switch and second switch, the first switch and the second switch are installed in the terminal box body, the first switch and the second switch are electrically connected with the binding post;Static switch, the static switch is installed in the terminal box body, and the static switch is electrically connected with the binding post, the first switch and the second switch;Interlock component, the static switch and the first switch between, the static switch and the second switch between are equipped with the interlock component. The utility model is conducive to improving transformer testing efficiency, and improves test process continuity.

Description

Technical Field

[0001] This utility model relates to the technical field of transformer testing equipment, and in particular to a transformer testing junction box. Background Technology

[0002] A transformer is a static electrical device based on the principle of electromagnetic induction, used to convert the voltage and current of alternating current from one level to another while maintaining the frequency.

[0003] In power systems, transformers, as core equipment, require regular characteristic tests (such as turns ratio tests and DC resistance tests). Through electrical performance verification, condition diagnosis, and compliance verification, fault prevention, energy efficiency optimization, and lifespan extension are achieved. Neglecting testing may lead to catastrophic accidents (such as explosions and fires), while standardized testing can significantly improve the reliability and economy of power systems. Currently, in the characteristic tests of 220kV three-winding main transformers, each test requires test personnel to climb to the bushing to perform wiring operations. After completing one test, the wiring must be disconnected before proceeding to the next test. This involves repeated climbing, repeated wiring modifications, and long working hours at height, resulting in low testing efficiency and posing risks to equipment and personal safety.

[0004] Therefore, those skilled in the art are dedicated to developing a transformer test junction box to improve transformer testing efficiency and enhance the continuity of the testing process. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a transformer test junction box to improve transformer testing efficiency and enhance the continuity of the test process.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A transformer test junction box, including A junction box body, on which multiple terminal blocks are installed; A first switching switch and a second switching switch are installed inside the junction box body, and both the first switching switch and the second switching switch are electrically connected to the terminal block; An electrostatic transfer switch is installed inside the junction box and is electrically connected to the terminal block, the first transfer switch, and the second transfer switch. An interlocking assembly is installed between the electrostatic switching switch and the first switching switch, and between the electrostatic switching switch and the second switching switch.

[0007] The advantages of adopting the above scheme are: the junction box body can be connected to each bushing of the transformer in one go through multiple terminals, and all subsequent test items (turn ratio, DC resistance, dielectric loss, withstand voltage, etc.) can be switched on the ground by switching switch, without having to climb the bushing repeatedly; When the first or second switch is switched to the test position, the interlocking component will lock the switch with the electrostatic switch to prevent accidental operation of the electrostatic switch during the test. When the switch is set to the zero position, the electrostatic switch can be rotated to connect the test component to the electrostatic discharger, thereby releasing the static electricity or residual charge such as capacitance or inductance on the test component and preventing it from affecting the next test.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, both the first and second switching switches include a switch body, and the switch body has multiple connectors, which are connected to the terminals via wires; The switch body has a switching handle connected to its end, and the switching handle extends out of the junction box body.

[0010] The beneficial effect of adopting the above-mentioned further solution is that the switching action is brought out from the junction box body, so that the test personnel can complete the gear switching on the ground or a safe platform.

[0011] Furthermore, the first switching switch and the second switching switch are connected to a first rotating shaft at their ends. The interlocking assembly includes a cam assembly. The first rotating shaft is connected to the cam assembly at its end. A lifting assembly is provided at the upper end of the cam assembly. A horizontal moving assembly is provided on the side of the lifting assembly. A locking assembly is provided at the end of the horizontal moving assembly. The locking assembly is connected to the electrostatic switching switch. The rotation of the first rotating shaft and the cam assembly drives the lifting assembly to move up and down, causing the horizontal moving assembly to move horizontally, so that the end of the horizontal moving assembly abuts against the engaging assembly to form an interlock.

[0012] The beneficial effect of adopting the above-mentioned further solution is that the rotational motion of the first or second switching switch is converted into the linear locking motion of the electrostatic switching switch. The electrostatic switch can only be unlocked after the current switching switch is fully in position, thus preventing accidental switching while energized.

[0013] Furthermore, the cam assembly includes a cam body, the middle part of which is connected to the first rotating shaft. The cam body has a first convex part and a second convex part, and a recess is provided between the first convex part and the second convex part. The end of the lifting assembly is located directly above the recess.

[0014] The beneficial effect of adopting the above-mentioned further solution is that the rotation of the cam body drives the first or second cam to rotate, so that the lifting assembly can move up and down.

[0015] Furthermore, the lifting assembly includes a lifting wheel component, which is used to abut against the cam assembly. The upper end of the lifting wheel component is sequentially connected to a lifting rod and a lifting platform. A wedge block is installed on the lifting platform, and the inclined side of the wedge block abuts against the horizontal moving assembly. The lifting rod is fitted with a first limiting plate, the end of which is connected to the inner wall of the junction box body. The lifting rod is also fitted with a first return spring, the two ends of which abut against the first limiting plate and the lifting wheel component, respectively.

[0016] The beneficial effect of adopting the above-mentioned further solution is that the rotation of the cam assembly lifts the lifting rod, causing the wedge block to move up and down, thereby driving the horizontal moving assembly to move horizontally; The first return spring helps the lifting rod move downwards when the cam assembly returns to the zero position.

[0017] Furthermore, the horizontal moving assembly includes a horizontal moving rod, with a first horizontal wheel component and a second horizontal wheel component respectively installed at both ends of the horizontal moving rod. The first horizontal wheel component is used to abut against the lifting assembly, and the second horizontal wheel component is used to cooperate with the engaging assembly. The horizontal moving rod is fitted with a second limiting plate, the end of which is connected to the inner wall of the junction box body. The horizontal moving rod is also fitted with a second return spring, the two ends of which abut against the second limiting plate and the connecting plate respectively. The connecting plate is fixedly connected to the horizontal moving rod.

[0018] The beneficial effect of adopting the above-mentioned further solution is that: the first flat wheel component and the second horizontal wheel component are set at both ends of the horizontal moving rod, which converts the inclined thrust of the wedge block into the translation of the horizontal moving rod, making it easier to engage and interlock with the locking component.

[0019] Furthermore, a guide plate is also connected inside the junction box body, the guide plate has a guide hole, and the horizontal moving rod passes through the guide hole.

[0020] The beneficial effect of adopting the above-mentioned further solution is that the guide hole is used not only to support the horizontal moving rod, but also to guide the horizontal moving rod.

[0021] Furthermore, the engaging assembly includes an engaging block, the middle of which is connected to the middle of the electrostatic switching switch via a second rotating shaft; The engaging block has an engaging groove for abutting against the second horizontal wheel component.

[0022] The beneficial effect of adopting the above-mentioned further solution is that when the second horizontal wheel component enters the engaging groove, it converts the thrust of the horizontal moving rod into a locking torque on the electrostatic switching switch shaft. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the transformer test junction box structure according to a specific embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the first switching switch, the second switching switch, and the electrostatic switching switch according to a specific embodiment of the present invention; Figure 3 This is a schematic diagram of the interlocking component structure according to a specific embodiment of the present invention; Figure 4 This is a schematic diagram of the cam assembly and lifting assembly according to a specific embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a horizontal moving component according to a specific embodiment of the present invention; Figure 6 This is a schematic diagram of the card-locking component structure according to a specific embodiment of the present invention.

[0024] The attached diagram lists the components represented by each number as follows: 1. Junction box body; 2. Terminal block; 3. First switching switch; 4. Second switching switch; 5. Static switching switch; 6. Interlock assembly; 7. Switch body; 8. Connector; 9. Changeover handle; 10. First rotating shaft; 11. Cam assembly; 12. Lifting assembly; 13. Horizontal movement assembly; 14. Engaging assembly; 15. Cam body; 16. First protrusion; 17. Second protrusion; 18. Recess; 19. Lifting wheel assembly; 20. Lifting platform; 21. Wedge block; 22. First limiting plate; 23. First return spring; 24. Horizontal movement rod; 25. First horizontal wheel assembly; 26. Second horizontal wheel assembly; 27. Second limiting plate; 28. Second return spring; 29. ​​Connecting plate; 30. Guide plate; 31. Engaging block; 32. Second rotating shaft; 33. Engaging groove. Detailed Implementation

[0025] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0026] In the description of this invention, it should be understood that the terms "center," "length," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "inner," "outer," "circumferential," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the system or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, a transformer test junction box includes a junction box body 1, on which multiple terminals 2 are installed. In a specific embodiment, it includes 22 test terminals 2 and 1 grounding terminal 2, which are connected to all test lines and grounding lines. Eleven of the test terminals 2 are respectively connected to the A, B, and C phases of the high, medium, and low voltage sides of the main transformer under test, as well as the neutral point (if any) of the high and medium voltage sides. The other eleven test terminals 2 are connected to the testing instrument. The modular wiring port design realizes the standardized connection between the test lines and the main transformer and the instrument. The insulation plate fixing and phase sequence marking improve the reliability and identification of the wiring, and reduce the risk of human error.

[0030] The first switch 3 and the second switch 4 are installed inside the junction box body 1, and both the first switch 3 and the second switch 4 are electrically connected to the terminal block 2. The electrostatic transfer switch 5 is installed inside the junction box body 1, and is electrically connected to the terminal block 2, the first transfer switch 3 and the second transfer switch 4, and is used to connect the electrostatic discharger to release residual charge. Interlocking components 6 are installed between the electrostatic transfer switch 5 and the first transfer switch 3, and between the electrostatic transfer switch 5 and the second transfer switch 4, to ensure that the electrostatic transfer switch 5 is locked when the transfer switch is in the test position, thus preventing accidental operation.

[0031] like Figure 1 , Figure 2 As shown, in some embodiments, both the first switching switch 3 and the second switching switch 4 include a switch body 7. The switch body 7 has multiple connectors 8, which are connected to terminals 2 via wires to achieve electrical connection with each bushing of the transformer. A switching handle 9 is connected to the end of the switch body 7, extending beyond the junction box body 1 for convenient operation by test personnel on the ground or a safe platform. When the switching handle 9 is rotated, it drives the connectors 8 inside the switch body 7 to connect to different terminals 2, enabling switching between different test circuits without direct contact with the transformer bushings, thus improving the safety and convenience of operation.

[0032] like Figure 1 , Figure 2 and Figure 3 As shown, in another embodiment, the first switching switch 3 and the second switching switch 4 are connected to a first rotating shaft 10 at their ends. The interlocking assembly 6 includes a cam assembly 11. The first rotating shaft 10 is connected to the cam assembly 11 at its end. A lifting assembly 12 is provided at the upper end of the cam assembly 11. A horizontal moving assembly 13 is provided on the side of the lifting assembly 12. A locking assembly 14 is provided at the end of the horizontal moving assembly 13. The locking assembly 14 is connected to the electrostatic switching switch 5. The rotation of the first rotating shaft 10 and the cam assembly 11 drives the lifting assembly 12 to move up and down, causing the horizontal moving assembly 13 to move horizontally. This causes the end of the horizontal moving assembly 13 to abut against the locking assembly 14 to form an interlock, ensuring that the electrostatic switching switch 5 cannot be misoperated when the switching switch is in the test position, thus ensuring the safety and accuracy of the test process.

[0033] like Figure 3 and Figure 4 As shown, in this embodiment, the cam assembly 11 includes a cam body 15, the middle of which is connected to the first rotating shaft 10. The cam body 15 has a first protrusion 16 and a second protrusion 17, and a recess 18 is provided between the first protrusion 16 and the second protrusion 17. The end of the lifting assembly 12 is located directly above the recess 18. When the first rotating shaft 10 drives the cam body 15 to rotate, the first protrusion 16 or the second protrusion 17 will lift the lifting assembly 12 upward. When the cam body 15 rotates back to its original position, the recess 18 rotates to below the end of the lifting assembly 12, and the lifting assembly 12 moves downward under its own weight and the action of the return spring, thereby realizing the up and down movement of the lifting assembly 12.

[0034] like Figure 3 , Figure 4 and Figure 5 As shown, in one embodiment, the lifting assembly 12 includes a lifting wheel component 19, which is used to abut against the cam assembly 11. The upper end of the lifting wheel component 19 is sequentially connected to a lifting rod and a lifting platform 20. A wedge block 21 is installed on the lifting platform 20. The longitudinal section of the wedge block 21 is triangular. The hypotenuse of the wedge block 21 abuts against the horizontal moving assembly 13. A first limiting plate 22 is provided on the lifting rod. The end of the first limiting plate 22 is connected to the inner wall of the junction box body 1. A first return spring 23 is also provided on the lifting rod. The two ends of the first return spring 23 abut against the first limiting plate 22 and the lifting wheel component 19, respectively.

[0035] When the cam assembly 11 lifts the lifting wheel component 19, the lifting rod drives the wedge block 21 to move upward. Since the first limiting plate 22 is fixedly connected to the inner wall of the junction box body 1, the lifting rod and the lifting wheel component 19 will compress the first return spring 23 when they move upward. The inclined side of the wedge block 21 presses against the horizontal moving component 13, causing the horizontal moving component 13 to move horizontally and drive the engaging component 14 to engage with the electrostatic switching switch 5, thus achieving interlocking. When the cam assembly 11 rotates to the recessed position 18, the lifting component 12 moves downward under the action of the first return spring 23, and the horizontal moving component 13 moves in the opposite direction under the action of the return spring. The engaging component 14 disengages from the electrostatic switching switch 5, releasing the interlock.

[0036] like Figure 3 , Figure 4 and Figure 5 As shown, in one embodiment, the horizontal moving assembly 13 includes a horizontal moving rod 24. A first horizontal wheel component 25 and a second horizontal wheel component 26 are respectively installed at both ends of the horizontal moving rod 24. The first horizontal wheel component 25 abuts against the lifting assembly 12, and the second horizontal wheel component 26 cooperates with the engaging assembly 14. A second limiting plate 27 is sleeved on the horizontal moving rod 24, and the end of the second limiting plate 27 is connected to the inner wall of the junction box body 1. A second return spring 28 is also sleeved on the horizontal moving rod 24, and both ends of the second return spring 28 abut against the second limiting plate 27 and the connecting plate 29 respectively. The connecting plate 29 is fixedly connected to the horizontal moving rod 24. A guide plate 30 is also connected inside the junction box body 1. The guide plate 30 has a guide hole, and the horizontal moving rod 24 passes through the guide hole. The guide hole not only supports and guides the horizontal moving rod 24 but also limits the horizontal movement distance of the connecting plate 29.

[0037] When the lifting assembly 12 is lifted, the first horizontal wheel component 25 is lifted and moves along the guide hole, driving the horizontal moving rod 24 to move horizontally. Since the second limiting plate 27 is fixedly connected to the inner wall of the junction box body 1, the horizontal moving rod 24 and the connecting plate 29 will compress the second return spring 28 when they move horizontally. The second horizontal wheel component 26 moves accordingly and cooperates with the locking assembly 14 to achieve locking interlock. When the lifting assembly 12 is lowered, the horizontal moving rod 24 moves in the opposite direction under the action of the second return spring 28 to release the locking.

[0038] like Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, in this example, the locking assembly 14 includes a locking block 31. The middle part of the locking block 31 is connected to the middle part of the electrostatic switch 5 via a second rotating shaft 32. The locking block 31 has a locking groove 33, which is used to abut against the second horizontal wheel component 26. When the horizontal moving assembly 13 moves, the second horizontal wheel component 26 enters the locking groove 33. Through the lever principle, the locking block 31 rotates around the second rotating shaft 32, thereby converting the thrust of the horizontal moving rod 24 into a locking torque on the rotating shaft of the electrostatic switch 5, thereby locking the electrostatic switch 5 and preventing it from being misoperated during the test, ensuring the safety and reliability of the test process.

[0039] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A transformer test junction box, characterized in that: include Junction box body (1), on which multiple terminals (2) are installed; A first switching switch (3) and a second switching switch (4) are installed inside the junction box body (1). Both the first switching switch (3) and the second switching switch (4) are electrically connected to the terminal block (2). An electrostatic switching switch (5) is installed inside the junction box body (1), and the electrostatic switching switch (5) is electrically connected to the terminal block (2), the first switching switch (3) and the second switching switch (4); Interlock assembly (6) is installed between the electrostatic switching switch (5) and the first switching switch (3), and between the electrostatic switching switch (5) and the second switching switch (4). The first switching switch (3) and the second switching switch (4) are connected to a first rotating shaft (10). The interlocking assembly (6) includes a cam assembly (11). The first rotating shaft (10) is connected to the cam assembly (11). A lifting assembly (12) is provided on the upper end of the cam assembly (11). A horizontal moving assembly (13) is provided on the side of the lifting assembly (12). A locking assembly (14) is provided at the end of the horizontal moving assembly (13). The locking assembly (14) is connected to the electrostatic switching switch (5). The first rotating shaft (10) and the cam assembly (11) rotate to drive the lifting assembly (12) to move up and down, causing the horizontal moving assembly (13) to move horizontally, so that the end of the horizontal moving assembly (13) abuts against the engaging assembly (14) to form an interlock.

2. The transformer test junction box according to claim 1, characterized in that: Both the first switch (3) and the second switch (4) include a switch body (7), and the switch body (7) has a plurality of connectors (8), which are connected to the terminal (2) by wires; The switch body (7) is connected to a change handle (9) at one end, and the change handle (9) extends out of the junction box body (1).

3. The transformer test junction box according to claim 1, characterized in that: The cam assembly (11) includes a cam body (15), the middle of which is connected to the first rotating shaft (10). The cam body (15) has a first protrusion (16) and a second protrusion (17), and a recess (18) is provided between the first protrusion (16) and the second protrusion (17). The end of the lifting assembly (12) is located directly above the recess (18).

4. The transformer test junction box according to claim 1, characterized in that: The lifting assembly (12) includes a lifting wheel component (19), which is used to abut against the cam assembly (11). The upper end of the lifting wheel component (19) is connected to a lifting rod and a lifting platform (20) in sequence. A wedge block (21) is installed on the lifting platform (20), and the inclined side of the wedge block (21) abuts against the horizontal moving assembly (13). The lifting rod is fitted with a first limiting plate (22), the end of which is connected to the inner wall of the junction box body (1). The lifting rod is also fitted with a first return spring (23), the two ends of which abut against the first limiting plate (22) and the lifting wheel component (19) respectively.

5. The transformer test junction box according to claim 1, characterized in that: The horizontal moving assembly (13) includes a horizontal moving rod (24), and a first horizontal wheel component (25) and a second horizontal wheel component (26) are respectively installed at both ends of the horizontal moving rod (24). The first horizontal wheel component (25) is used to abut against the lifting assembly (12), and the second horizontal wheel component (26) is used to cooperate with the engaging assembly (14). The horizontal moving rod (24) is fitted with a second limiting plate (27), the end of the second limiting plate (27) is connected to the inner wall of the junction box body (1), and the horizontal moving rod (24) is also fitted with a second return spring (28), the two ends of the second return spring (28) abut against the second limiting plate (27) and the connecting plate (29) respectively, and the connecting plate (29) is fixedly connected to the horizontal moving rod (24).

6. The transformer test junction box according to claim 5, characterized in that: The junction box body (1) is also connected to a guide plate (30), the guide plate (30) has a guide hole, and the horizontal moving rod (24) passes through the guide hole.

7. The transformer test junction box according to claim 5, characterized in that: The engaging assembly (14) includes an engaging block (31), the middle of which is connected to the middle of the electrostatic switching switch (5) via a second rotating shaft (32); The engaging block (31) has an engaging groove (33) for abutting against the second horizontal wheel component (26).

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