Detection platform and detection method for transformer high voltage bushings

Abstract

The embodiment of the present application provides a detection platform and a detection method for a high-voltage bushing of a transformer, the detection platform comprises a mounting frame, a lifting assembly, a turnover assembly, a connecting piece and a detection oil barrel, the mounting frame has a communicating mounting cavity and a mounting port, and the high-voltage bushing can pass through the mounting port and extend into the mounting cavity. The lifting assembly is arranged on the mounting frame. The turnover assembly is arranged on the mounting frame and / or the lifting assembly. The connecting piece is connected with a driving end of the turnover assembly, the connecting piece is located on a side of the mounting port away from the mounting cavity, the connecting piece is used for being connected with the high-voltage bushing, the connecting piece has an included angle between the connecting piece in a dismounting position and a horizontal plane, the connecting piece is parallel to the horizontal plane in a detection position, and the turnover assembly can drive the connecting piece to switch between the dismounting position and the detection position. The detection oil barrel is arranged in the mounting cavity, and the lifting assembly can drive the connecting piece to reciprocatingly lift so as to adjust the depth of the high-voltage bushing immersed in the detection oil barrel.

Description

Technical Field

[0001] This application relates to the field of power equipment testing technology, and in particular to a testing platform and testing method for high-voltage bushings of transformers. Background Technology

[0002] The high-voltage bushing of a transformer is a critical component connecting the internal windings of the transformer to the external power grid, and its insulation performance directly affects the safe operation of the transformer. Before transformer installation or during maintenance, electrical tests, such as withstand voltage tests, are required on the high-voltage bushing.

[0003] Currently, when testing high-voltage bushings on-site, a crane is typically used to lift the bushing before testing. However, because the bushing is tilted during lifting, the stray capacitance to ground increases, making it difficult to guarantee the accuracy of the test data. Furthermore, when the test voltage is high (e.g., exceeding 10kV), the bushing needs to be placed upright, and its lower porcelain insulator needs to be immersed in insulating oil to improve insulation strength. Existing auxiliary equipment cannot simultaneously achieve both upright fixing of the bushing and flexible adjustment of the oil immersion depth. Summary of the Invention

[0004] In view of this, this application aims to provide a testing platform and testing method for transformer high-voltage bushings, solving the problem of inaccurate measurement caused by tilting in traditional solutions.

[0005] In a first aspect, this application provides a testing platform for high-voltage bushings of transformers, including a mounting frame, a lifting assembly, a tilting assembly, a connector, and a testing oil tank. The mounting frame has a communicating mounting cavity and a mounting opening, through which the high-voltage bushing can extend into the mounting cavity. The lifting assembly is mounted on the mounting frame. The tilting assembly is mounted on the mounting frame and / or the lifting assembly. The connector is connected to the drive end of the tilting assembly, and is located on the side of the mounting opening opposite to the mounting cavity. The connector is used to connect to the high-voltage bushing. In the disassembly / assembly position, the connector has an angle with the horizontal plane; in the testing position, the connector is parallel to the horizontal plane. The tilting assembly can drive the connector to switch between the disassembly / assembly position and the testing position. The testing oil tank is disposed within the mounting cavity, and the lifting assembly can drive the connector to reciprocate up and down to adjust the depth of the high-voltage bushing immersed in the testing oil tank.

[0006] In some implementations, the connector is rotatably connected to the lifting assembly.

[0007] In some embodiments, the high-pressure bushing includes a pipe body and a flange mounted on the pipe body. The connector includes a connecting bracket, a first connecting portion, and a second connecting portion. The connecting bracket has a clearance opening corresponding to the mounting port, the pipe body passes through the clearance opening, and the flange is connected to the inner edge of the connecting bracket. The first connecting portion is located on the outer edge of the connecting bracket and is connected to the drive end of the tilting assembly. The second connecting portion is located relative to the first connecting portion on the outer edge of the connecting bracket and is rotatably connected to the lifting assembly.

[0008] In some embodiments, the connecting bracket includes a base bracket and at least one adapter bracket. The base bracket is connected to the drive end of the flipping assembly and has a first clearance opening. At least one adapter bracket is detachably mounted on the base bracket and has a second clearance opening for connection with a flange of a high-pressure bushing. The diameter of the second clearance opening is smaller than the diameter of the first clearance opening.

[0009] In some embodiments, the tilting assembly includes a power unit, a worm gear, and a turbine, with the worm gear connected to the power unit. The turbine is connected to both the worm gear and the connecting member, and the power unit drives the connecting member to rotate via the worm gear and the turbine.

[0010] In some embodiments, the lifting assembly includes a lead screw, a lifting frame, and a drive unit, with the lead screw rotatably mounted on a mounting frame. The lifting frame is threadedly connected to the lead screw and is connected to a tilting assembly and / or a connecting member. The drive unit is driven by the lead screw and drives the lead screw to rotate, causing the connecting member to reciprocate up and down.

[0011] In some embodiments, the lifting assembly further includes a guide hole and a guide rod, the guide hole being disposed on the mounting frame. The guide rod is disposed on the lifting frame and passes through the guide hole.

[0012] In some embodiments, the testing platform also includes an adjustment bracket, which may be disposed within the mounting cavity, and the testing oil drum is mounted on the adjustment bracket.

[0013] In some implementations, the detection platform also includes a limiting member disposed on the mounting frame or lifting assembly, which restricts the movement of the connector relative to the mounting frame when the connector is in the detection position.

[0014] Secondly, this application provides a method for testing high-voltage bushings of transformers, implemented using the testing platform provided in any of the above embodiments. The testing method includes: The high-pressure bushing is fixed to the connector, wherein the connector is in the disassembly / removal position; Activate the flipping assembly to flip the connector and high-pressure bushing from the disassembly position to the inspection position; Start the lifting assembly to drive the connecting parts and high-pressure bushing to descend, so that at least a portion of the high-pressure bushing is immersed in the test oil in the test oil tank; A test voltage is applied to the high-voltage bushing for testing.

[0015] Compared with the prior art, the beneficial effects of this application are: This application utilizes a tilting assembly to convert the high-voltage bushing from an inclined to an upright testing position, eliminating the increased stray capacitance to ground caused by tilting and making the test voltage distribution closer to the theoretical value, resulting in more accurate and reliable test data. The lifting assembly can adjust the depth of the high-voltage bushing's immersion in the oil tank, ensuring sufficient insulation strength for the lower porcelain insulator to safely withstand test voltages above 10kV. The installation and removal position is consistent with the tilt angle of the hoisted high-voltage bushing, allowing for direct fixation without adjusting the hoisting ropes, avoiding the risks of working at height. The tilting assembly operates smoothly, preventing the high-voltage bushing from swinging uncontrollably and impacting the porcelain insulator. Through independent control of the lifting and tilting assemblies, the posture and height can be freely combined to adapt to the testing needs of different voltage levels and models of high-voltage bushings.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A three-dimensional structural diagram of the detection platform provided in the embodiments of this application; Figure 2 A schematic diagram of the structure of a detection platform provided in one embodiment of this application; Figure 3 A top view of a detection platform provided in one embodiment of this application; Figure 4 A flowchart of a detection method provided for one embodiment of this application.

[0019] Explanation of reference numerals in the attached figures: 1. Mounting frame, 11. Mounting cavity, 12. Mounting port. 2. Lifting assembly, 21. Lead screw, 22. Lifting frame, 23. Drive unit, 24. Guide rod. 3 flip components, 4 connectors 41 Connecting bracket, 411 Basic bracket, 412 Adapter bracket, 42 First connecting part, 43 Second connecting part, 51. Inspect the oil drum; 52. Adjust the support bracket. 6 High-pressure bushing, 61 Pipe body, 62 Flange. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0022] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0023] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0024] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0025] Firstly, this application provides a testing platform for the high-voltage bushing 6 of a transformer, such as... Figure 1 and Figure 2As shown, it includes an installation frame 1, a lifting assembly 2, a tilting assembly 3, a connector 4, and a detection oil tank 51.

[0026] The mounting frame 1 serves as a skeleton providing overall support and accommodating space. Optionally, the mounting frame 1 is made of a rigid material, such as structural steel. The mounting frame 1 has a communicating mounting cavity 11 and a mounting opening 12. The mounting cavity 11 provides accommodating space, and the mounting opening 12 is a channel for the high-pressure bushing 6 to enter the mounting cavity 11. The mounting cavity 11 is located in a hollow position inside the mounting frame 1, and the mounting opening 12 is located at the top of the mounting frame 1. The high-pressure bushing 6 extends into the mounting cavity 11 through the mounting opening 12. Optionally, the mounting frame 1 is assembled using detachable rods for easy transportation and on-site assembly.

[0027] The lifting assembly 2 is mounted on the mounting frame 1. The lifting assembly 2 can drive the connecting piece 4 to move linearly in the vertical direction, thereby adjusting the height of the connecting piece 4 and the high-pressure bushing 6. Specifically, the connecting piece 4 can move vertically upward or downward under the drive of the lifting assembly 2, and the vertical stroke can cover the range of the high-pressure bushing 6 from being completely detached from the oil surface to being submerged to the required depth.

[0028] The tilting component 3 is mounted on the mounting frame 1 and / or the lifting component 2. For example, the tilting component 3 can be mounted on the mounting frame 1. Alternatively, the tilting component 3 can be mounted on the lifting component 2. The drive end of the tilting component 3 is connected to the connector 4, and the tilting component 3 can drive the connector 4 to rotate, thereby changing the attitude angle of the connector 4.

[0029] The connector 4 is used to connect to the high-pressure bushing 6. Optionally, the connector 4 can be directly fixed to the high-pressure bushing 6. Optionally, the connector 4 is a plate-shaped or ring-shaped structure that clamps the high-pressure bushing 6. The connector 4 is connected to the drive end of the flipping assembly 3. The connector 4 is located on the side of the mounting port 12 away from the mounting cavity 11. When the connector 4 is in the detection position, the high-pressure bushing 6 extends vertically downward through the mounting port 12 into the mounting cavity 11, and the connector 4 is located outside the mounting port 12, which is convenient for observation and operation.

[0030] It should be noted that connector 4 includes disassembly / reassembly positions and testing positions.

[0031] The connector 4, in the disassembly / assembly position, forms an angle with the horizontal plane, meaning it is in an inclined position. When the connector 4 is in an inclined position, the high-pressure bushing 6 is hoisted in a naturally inclined state and can be directly aligned and fixed with the connector 4 without additional adjustment of the hoisting angle.

[0032] In this test, the connector 4 is parallel to the horizontal plane and is in a horizontal state. Since the high-pressure bushing 6 is fixedly connected to the connector 4 and the axis of the high-pressure bushing 6 is perpendicular to the plane where the connector 4 is located, when the connector 4 is horizontal, the axis of the high-pressure bushing 6 is perpendicular to the ground, thus enabling upright testing.

[0033] The flipping component 3 can drive the connector 4 to switch between the disassembly / assembly position and the detection position. Specifically, the flipping component 3 drives the connector 4 to rotate around a certain horizontal axis, and the rotation angle range is the difference between the included angle of the disassembly / assembly position and the detection position.

[0034] The testing oil drum 51 is used to hold insulating oil. The testing oil drum 51 is set inside the mounting cavity 11, and the lifting assembly 2 can drive the connecting piece 4 to reciprocate up and down to adjust the depth of the high-voltage bushing 6 immersed in the testing oil drum 51.

[0035] This application uses the flipping component 3 to convert the high-voltage bushing 6 from an inclined position to an upright testing position, eliminating the increased stray capacitance to ground caused by the tilt, making the test voltage distribution closer to the theoretical value, and ensuring the test data is accurate and reliable. The lifting component 2 can adjust the depth of the high-voltage bushing 6 immersed in the oil tank, ensuring that the porcelain insulator at the bottom of the high-voltage bushing 6 has sufficient insulation strength to safely withstand test voltages above 10kV. The disassembly and assembly position is consistent with the tilt angle of the hoisted high-voltage bushing 6, allowing for direct fixation without adjusting the hoisting ropes, avoiding the risks of working at height; the flipping component 3 drives smoothly, preventing the high-voltage bushing 6 from swinging uncontrollably and hitting the porcelain insulator. Through the independent control of the lifting component 2 and the flipping component 3, the posture and height can be freely combined to adapt to the testing needs of different voltage levels and different models of high-voltage bushing 6.

[0036] In some implementations, such as Figure 1 and Figure 2 As shown, the connecting piece 4 is rotatably connected to the lifting assembly 2, allowing the connecting piece 4 to gain rotational freedom relative to the lifting assembly 2. During the flipping process of the flipping assembly 3, only the rotational inertia of the connecting piece 4 and the high-pressure bushing 6 needs to be overcome, and the lifting assembly 2 always maintains a vertical installation posture. Simultaneously, when the lifting assembly 2 drives the connecting piece 4 to rise or fall, the rotatable connection reliably transmits the vertical driving force to the connecting piece 4 without causing motion interference. This embodiment, by rotatably connecting the connecting piece 4 and the lifting assembly 2, achieves kinematic decoupling between the flipping motion and the lifting motion, ensuring independent control of the two degrees of freedom, avoiding motion interference and additional loads, and improving the platform's motion stability and structural reliability.

[0037] In some embodiments, the high-pressure bushing 6 includes a pipe body 61 and a flange 62 mounted on the pipe body 61. The connector 4 includes a connecting bracket 41, a first connecting portion 42, and a second connecting portion 43.

[0038] The connecting bracket 41 has a clearance opening corresponding to the mounting port 12. The pipe body 61 passes through the clearance opening, and the flange 62 is connected to the inner edge of the connecting bracket 41. The connecting bracket 41 can be a rigid plate that is approximately disc-shaped or square, with a central opening forming the clearance opening. The connecting bracket 41 serves as a mechanical interface between the high-pressure bushing 6 and the testing platform. The connecting bracket 41 can be made of steel or aluminum alloy, and its thickness can be designed according to the weight of the high-pressure bushing 6. Optionally, the thickness of the connecting bracket 41 is 10-30mm. It should be noted that the central axis of the clearance opening is coaxial with the central axis of the mounting port 12 of the mounting frame 1. When the connecting bracket 41 is in the testing position, the clearance opening faces the mounting port 12, allowing the pipe body 61 to pass vertically downward through the mounting port 12 into the mounting cavity 11 without interfering with the mounting frame 1.

[0039] The inner edge of the connecting bracket 41 refers to the annular area of ​​the clearance edge. The inner edge contacts the lower surface of the flange 62 and is connected via bolt holes, U-grooves, or quick-release plates. The diameter of the inner edge is smaller than the outer diameter of the flange 62 but larger than the outer diameter of the pipe body 61. The outer edge of the connecting bracket 41 refers to the outer circumferential area of ​​the connecting bracket 41, which can be a continuous annular shape or a lug extending at a specific angle.

[0040] The weight of the high-pressure bushing 6 is transferred to the inner edge of the connecting bracket 41 through the flange 62. The inner edge of the connecting bracket 41 serves as a bearing surface, distributing the vertical load evenly across the entire connecting bracket 41, thereby avoiding stress concentration. The flange 62 can be fastened to the inner edge with 4 to 8 bolts, providing sufficient friction to resist the overturning moment during tipping.

[0041] The first connecting part 42 is disposed on the outer edge of the connecting bracket 41 and is connected to the drive end of the flipping assembly 3. Optionally, the first connecting part 42 can be a bushing with a keyway or pin hole, which is fixedly connected to the output shaft of the flipping assembly 3. The flipping assembly 3 applies torque to the connecting bracket 41 through the first connecting part 42.

[0042] The second connecting part 43 is disposed relative to the first connecting part 42 on the outer edge of the connecting bracket 41, and is rotatably connected to the lifting assembly 2. Optionally, the second connecting part 43 can be an outwardly extending rotating shaft, and the second connecting part 43 and the bearing seat on the lifting assembly 2 form a rotating pair. The axis of the second connecting part 43 is the rotation axis of the connecting bracket 41 for flipping. The rotating pair formed between the second connecting part 43 and the lifting assembly 2 can constrain the connecting bracket 41 in all degrees of freedom except for rotation around the rotation axis, retaining only one rotational degree of freedom, so that the connecting bracket 41 can be smoothly flipped under the drive of the flipping assembly 3. At the same time, the second connecting part 43 can transfer the weight of the connecting bracket 41 and the high-pressure bushing 6 to the lifting assembly 2, and then to the mounting frame 1.

[0043] It should be noted that the first connecting part 42 and the second connecting part 43 are arranged approximately 180° diagonally on the outer edge of the connecting bracket 41, thereby forming the longest lever arm, reducing the driving force required for flipping, and ensuring symmetrical force distribution. This allows the flipping driving force and the support reaction force to form a couple, so that the connecting bracket 41 and the high-pressure bushing 6 are subjected to symmetrical force distribution during the flipping process, resulting in smooth movement and no additional bending moment.

[0044] In some implementations, such as Figures 1 to 3 As shown, the connecting bracket 41 includes a base bracket 411 and at least one adapter bracket 412.

[0045] The base support 411 is connected to the drive end of the tilting assembly 3, and has a first clearance opening. The base support 411 is the basic structure connecting the support 41, and directly bears the driving force from the tilting assembly 3 and the supporting force from the lifting assembly 2. The base support 411 can be a relatively thick annular or rectangular plate, and has a large first clearance opening. Optionally, the diameter of the first clearance opening is approximately 200-500 mm, and the diameter can be determined according to the specifications of the maximum high-pressure bushing 6. Optionally, the base support 411 has a positioning structure for installing the adapter support 412, including a positioning port, a positioning pin hole, and a threaded hole.

[0046] At least one adapter bracket 412 is detachably mounted on the base bracket 411. The adapter bracket 412 has a second clearance opening for connection with the flange 62 of the high-pressure bushing 6, the diameter of which is smaller than that of the first clearance opening. The adapter bracket 412 is an adapter component; its outer diameter can be larger than the first clearance opening of the base bracket 411, and its inner diameter matches the outer diameter of the tube body 61 of the high-pressure bushing 6. The upper surface of the adapter bracket 412 is provided with bolt holes or pressure plate grooves corresponding to the flange 62.

[0047] Optionally, the connection between the adapter bracket 412 and the base bracket 411 is non-permanent and can be repeatedly disassembled and reassembled without damaging the structure.

[0048] This application only requires the manufacture of a single general-purpose base bracket 411 and several small adapter brackets 412, instead of multiple complete large connecting brackets 41, significantly reducing material and processing costs. Replacing the adapter bracket 412 takes only a few minutes, without the need to reconnect the flipping assembly 3 and the lifting assembly 2, significantly improving testing efficiency, and is especially suitable for testing scenarios involving batches and multiple specifications of high-pressure bushings 6.

[0049] In some implementations, such as Figure 1 , Figure 2 and Figure 3As shown, the tilting assembly 3 includes a power unit, a worm gear, and a turbine. The worm gear and turbine form a worm gear reduction mechanism. Optionally, the power unit can be an electric motor, handwheel, or hydraulic motor, etc. The worm gear is connected to the power unit. The turbine is connected to both the worm gear and the connecting member 4, and the power unit drives the connecting member 4 to rotate via the worm gear and turbine.

[0050] The worm gear reducer can amplify the input torque by more than 20 times through a large reduction ratio, allowing operators to easily rotate the high-pressure bushing 6, which weighs hundreds of kilograms, by simply cranking the handwheel. Furthermore, the reverse self-locking characteristic of the worm gear mechanism ensures that the high-pressure bushing 6 remains stably stationary at any angle, preventing accidental falls due to gravity, thus eliminating safety hazards and eliminating the need for additional braking devices.

[0051] This application uses a worm gear and worm as the flipping component 3. On the one hand, it uses a large reduction ratio to achieve labor-saving flipping, and the operator can manually complete the attitude adjustment of the heavy high-pressure bushing 6. On the other hand, it uses the self-locking characteristic to ensure that the high-pressure bushing 6 stays stably at the detection position or other arbitrary angles without the need for additional brakes, which improves the safety of the test and the reliability of positioning.

[0052] In some implementations, such as Figure 1 and Figure 2 As shown, the lifting assembly 2 includes a lead screw 21, a lifting frame 22, and a drive unit 23. The lead screw 21 is rotatably mounted on the mounting frame 1. The lifting frame 22 is threadedly connected to the lead screw 21 and is connected to the tilting assembly 3 and / or the connecting member 4. The drive unit 23 is drively connected to the lead screw 21 and drives the lead screw 21 to rotate, thereby causing the connecting member 4 to reciprocate up and down.

[0053] Specifically, the drive unit 23 drives the lead screw 21 to rotate, and the thread on the lead screw 21 pushes the lifting frame 22 to move along the axis of the lead screw 21. The lifting frame 22 is fixed to the tilting assembly 3 and / or the connecting piece 4, thereby driving the connecting piece 4 and the high-pressure bushing 6 to rise and fall vertically. The lead screw 21 nut mechanism, consisting of the lead screw 21, the lifting frame 22, and the drive unit 23, has the advantages of smooth transmission, good self-locking, and strong load-bearing capacity. The operator can control the rotation direction of the drive unit 23 to raise or lower the lifting frame 22, thereby precisely adjusting the depth of the high-pressure bushing 6 immersed in the detection oil tank 51.

[0054] Optionally, the lead screw 21 can be a trapezoidal thread single-start lead screw 21, which is self-locking after the drive stops, preventing the high-pressure bushing 6 from sliding down due to gravity, eliminating the need for an additional brake and improving safety.

[0055] Optionally, the drive unit 23 can be equipped with a manual wheel or an electric motor. The manual wheel is suitable for sites without power, while the electric motor is suitable for scenarios requiring frequent operation.

[0056] In some implementations, such as Figure 1As shown, the lifting assembly 2 also includes a guide hole and a guide rod 24. The guide hole is disposed on the mounting frame 1. The guide rod 24 is disposed on the lifting frame 22 and passes through the guide hole. The inner diameter of the guide hole and the outer diameter of the guide rod 24 form a sliding fit, providing a precise linear motion track for the guide rod 24.

[0057] Optionally, the guide rod 24 is a cylindrical long rod mounted on the lifting frame 22, and the axis of the guide rod 24 is parallel to the axis of the lead screw 21. The guide rod 24 moves up and down with the lifting frame 22, and its outer surface contacts the inner surface of the guide hole, constraining the lifting frame 22 to move only in the vertical direction and preventing the lifting frame 22 from rotating with the lead screw 21.

[0058] This embodiment effectively prevents the lifting frame 22 from rotating with the lead screw 21 by setting guide rods 24 and guide holes, ensuring that the connecting piece 4 and the high-pressure bushing 6 only perform vertical lifting movements, improving the straightness and stability of the lifting. At the same time, it shares the lateral load, protects the lead screw 21 from bending, and extends the service life of the lifting assembly 2. In addition, the symmetrically arranged guide rods 24 can also absorb the overturning moment generated when the tilting assembly 3 is working, making the entire platform more stable.

[0059] In some implementations, such as Figure 1 and Figure 2 As shown, the testing platform also includes an adjustment bracket 52, which can be optionally installed in the mounting cavity 11, and the testing oil tank 51 is installed on the adjustment bracket 52.

[0060] The adjusting bracket 52 is an adjustable support structure that supports and adjusts the vertical position of the detection oil tank 51. The adjusting bracket 52 can be located at the bottom or middle of the mounting cavity 11. The adjusting bracket 52 can be a scissor lift platform, a screw lift mechanism, a hydraulic jack, or a set of pads with different height settings.

[0061] It should be noted that the adjustment bracket 52 can be installed or not depending on the test requirements, or different installation positions can be selected within the mounting cavity 11.

[0062] The testing oil drum 51 is placed on the upper surface of the adjusting bracket 52 or fixed on the bracket of the adjusting bracket 52. When the adjusting bracket 52 is raised, lowered or replaced, the testing oil drum 51 moves up and down accordingly.

[0063] This embodiment, by adding the adjusting bracket 52, achieves independent adjustment of the oil drum height, complementing the height adjustment of the high-pressure sleeve 6 of the lifting assembly 2 and expanding the adjustment range of oil immersion depth. Simultaneously, it facilitates oil drum replacement or internal drum maintenance, enhancing the platform's operational flexibility. The selectable configuration of the adjusting bracket 52 allows the platform to be simplified or expanded according to experimental needs, reducing unnecessary costs.

[0064] In some embodiments, the detection platform also includes a limiting member disposed on the mounting frame 1 or the lifting assembly 2. When the connector 4 is in the detection position, the limiting member is used to restrict the movement of the connector 4 relative to the mounting frame 1.

[0065] After setting the limiting component in this embodiment, the connector 4 is provided with additional mechanical limiting or locking at the detection position. This, together with the self-locking of the flipping component 3, forms a double protection, preventing the connector 4 from exceeding the detection position or rotating unexpectedly due to vibration, misoperation, or self-locking failure. This improves the safety and reliability of the high-pressure test process and ensures that the high-pressure bushing 6 always maintains a precise vertical state, which is beneficial to the accuracy of the test data.

[0066] Optionally, the limiting element includes a stop or a quick-release pin.

[0067] Secondly, this application provides a method for detecting the high-voltage bushing 6 of a transformer, such as... Figure 4 As shown, the detection method implemented through any of the above embodiments using the detection platform includes: S102, fix the high-pressure bushing to the connector, wherein the connector is in the disassembly / removal position.

[0068] When the crane lifts the high-pressure bushing 6, the high-pressure bushing 6 naturally tilts. At this time, the connector 4 is in the disassembly / assembly position, and there is an angle between the connector 4 and the horizontal plane, that is, the connector 4 is also tilted. It can be understood that the initial position of the connector 4 is the disassembly / assembly position, or the connector 4 is driven to the disassembly / assembly position by the flipping assembly 3.

[0069] At this point, the connector 4, which is in the disassembly / assembly position, is aligned with the hoisted high-pressure bushing 6, allowing for direct alignment and fixation. This simplifies the operation, reduces adjustment time, and avoids problems such as repeated hole alignment and porcelain insulator collisions caused by mismatched angles in traditional methods. Specifically, operators can use bolts to tighten the flange 62 of the high-pressure bushing 6 to the inner edge of the connector 4, forming a rigid connection.

[0070] S104, activate the flipping assembly to flip the connector and high-pressure bushing from the disassembly position to the inspection position.

[0071] The operator can manually rotate the manual wheel or start the motor. The flipping component 3 drives the turbine through the worm gear, and the turbine drives the connecting piece 4 to rotate around the horizontal axis.

[0072] During the process of connecting part 4 flipping from the disassembly / assembly position to the detection position, connecting part 4 will flip at a certain angle under the drive of the flipping component 3. This angle is equal to the angle between the disassembly / assembly position and the horizontal plane. For example, if the disassembly / assembly position is tilted at 30°, the flipping angle is 30°; if the disassembly / assembly position is tilted at 45°, the flipping angle is 45°. When connecting part 4 is in the detection position, connecting part 4 is parallel to the horizontal plane, and the axis of the high-pressure bushing 6 located on connecting part 4 is perpendicular to the ground, and the high-pressure bushing 6 is in an upright state.

[0073] This step utilizes the speed reduction and torque increase effect of the worm gear to easily rotate the high-pressure bushing 6 manually or electrically. The rotation process is smooth and impact-free, preventing the high-pressure bushing 6 from shaking and colliding with surrounding components. Furthermore, the self-locking characteristic of the worm gear ensures that the high-pressure bushing 6 remains stable in an upright position after rotation stops, without the need for continuous force.

[0074] S106, start the lifting assembly, drive the connecting parts and high-pressure bushing to descend, so that at least a part of the high-pressure bushing is immersed in the test oil in the test oil tank.

[0075] The operator can activate the lifting assembly 2, and the lead screw 21 rotates to push the lifting frame 22 and connecting parts 4 downwards at a uniform speed, causing the high-voltage bushing 6 to move downwards in an upright position. When the lower end of the high-voltage bushing 6 contacts the oil surface and continues to descend to the preset depth, the lifting assembly 2 is stopped. The self-locking property of the lead screw 21 keeps the high-voltage bushing 6 at the set depth, avoiding depth drift caused by oil buoyancy or vibration during the test. This allows for the achievement of the stringent requirements of high-voltage testing for the oil immersion insulation of the high-voltage bushing 6, with precise depth control and stable maintenance, meeting the test standards for different voltage levels.

[0076] S108 applies a test voltage to the high-voltage bushing for testing.

[0077] With the high-voltage bushing 6 upright and its lower part immersed in oil, the external electric field distribution of the high-voltage bushing 6 is symmetrical, and the stray capacitance to ground is minimal, so the test results best reflect its true insulation level. If tilted or not immersed in oil, stray capacitance and surface flashover voltage will interfere with the test data. At this time, both the flipping component 3 and the lifting component 2 are in a stationary state, and the limiting component and the worm gear self-locking mechanism work together to maintain the stability of the posture. The insulating oil in the test oil tank 51 provides sufficient insulation strength to prevent the porcelain insulator at the bottom of the high-voltage bushing 6 from breaking down to ground under high voltage. During the test, the entire test platform serves as a grounding reference plane, and the mounting frame 1 should be reliably grounded.

[0078] The testing method provided in this application utilizes the tilting characteristics of the connector 4 at the disassembly / assembly position to naturally match the hoisting posture of the high-voltage bushing 6 with the fixed interface, eliminating the need for additional adjustments. This avoids the risks of repeated hole alignment and collisions with porcelain insulators in traditional hoisting, significantly improving operational safety and efficiency. The flipping component 3 enables easy flipping of the heavy-duty high-voltage bushing 6, with a large reduction ratio providing a labor-saving effect. The self-locking characteristic ensures stable maintenance of the upright posture without the need for additional braking, simplifying operation and improving reliability. Applying high voltage to the high-voltage bushing 6 in an upright position with its lower part immersed in oil eliminates stray capacitance errors caused by tilting. At the same time, the insulating oil provides sufficient insulation strength, ensuring that the test results truly reflect the performance of the high-voltage bushing 6.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A testing platform for high-voltage bushings of transformers, characterized in that, include: The mounting frame has a communicating mounting cavity and mounting port, and the high-pressure bushing can extend into the mounting cavity through the mounting port; A lifting assembly is mounted on the mounting frame; A flipping component is disposed on the mounting frame and / or the lifting component; A connector is connected to the drive end of the flipping assembly. The connector is located on the side of the mounting port away from the mounting cavity. The connector is used to connect to the high-pressure bushing. The connector in the disassembly position has an angle with the horizontal plane. The connector in the detection position is parallel to the horizontal plane. The flipping assembly can drive the connector to switch between the disassembly position and the detection position. An oil drum is installed inside the mounting cavity. The lifting assembly can drive the connector to reciprocate up and down to adjust the depth of the high-pressure bushing immersed in the oil drum.

2. The detection platform according to claim 1, characterized in that, The connector is rotatably connected to the lifting assembly.

3. The detection platform according to claim 2, characterized in that, The high-pressure bushing includes a pipe body and a flange mounted on the pipe body; The connector includes: A connecting bracket having a clearance opening corresponding to the mounting port, the pipe body passing through the clearance opening, and the flange being connected to the inner edge of the connecting bracket; A first connecting part is disposed on the outer edge of the connecting bracket, and the first connecting part is connected to the driving end of the flipping component; The second connecting part is disposed on the outer edge of the connecting bracket relative to the first connecting part, and the second connecting part is rotatably connected to the lifting assembly.

4. The detection platform according to claim 3, characterized in that, The connecting bracket includes: A base support is connected to the drive end of the flipping component, and the base support is provided with a first clearance opening; At least one adapter bracket is detachably mounted on the base bracket, the adapter bracket having a second clearance for flange connection with the high-pressure bushing, the diameter of the second clearance being smaller than the diameter of the first clearance.

5. The detection platform according to any one of claims 1 to 4, characterized in that, The flipping component includes: Power Department; The worm gear is connected to the power unit; The turbine is connected to the worm and the connecting member respectively, and the power unit drives the connecting member to rotate through the worm and the turbine.

6. The detection platform according to any one of claims 1 to 4, characterized in that, The lifting assembly includes: The lead screw is rotatably mounted on the mounting frame; A lifting frame is threadedly connected to the lead screw, and the lifting frame is connected to the tilting assembly and / or the connecting piece; The drive unit is connected to the lead screw drive, and the drive unit drives the lead screw to rotate so that the connecting member reciprocates up and down.

7. The detection platform according to claim 6, characterized in that, The lifting assembly also includes: Guide holes are provided on the mounting frame; A guide rod is provided on the lifting frame, and the guide rod passes through the guide hole.

8. The detection platform according to any one of claims 1 to 4, characterized in that, The detection platform also includes: An adjusting bracket is optionally disposed within the mounting cavity, and the detection oil tank is mounted on the adjusting bracket.

9. The detection platform according to any one of claims 1 to 4, characterized in that, The detection platform also includes: A limiting member is disposed on the mounting frame or the lifting assembly. When the connecting member is in the detection position, the limiting member is used to restrict the movement of the connecting member relative to the mounting frame.

10. A method for detecting high-voltage bushings of transformers, implemented using a detection platform as described in any one of claims 1 to 9, characterized in that, The detection method includes: The high-pressure bushing is fixed to the connector, wherein the connector is in the disassembly / assembly position; Activate the flipping assembly to flip the connector and the high-pressure bushing from the disassembly / assembly position to the detection position; Start the lifting assembly to drive the connector and the high-pressure bushing to descend, so that at least a portion of the high-pressure bushing is immersed in the test oil in the test oil tank; A test voltage is applied to the high-voltage bushing for testing.

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