Transformer defect simulation test device
By installing an isolation bucket and wiring contacts on the transformer, the short-circuit defect simulation component can be easily disassembled and assembled, solving the problem of inconvenient disassembly and maintenance in the existing technology and improving operational efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHANDONG POWER EQUIP CO LTD
- Filing Date
- 2025-06-16
- Publication Date
- 2026-05-12
AI Technical Summary
Existing short-circuit fault simulation devices are inconvenient to disassemble and repair, require large amounts of insulating oil to be drained from the transformer, and are cumbersome to operate.
A transformer defect simulation test device was designed. An isolation bucket is used to isolate the internal space of the transformer from the internal space of the isolation bucket. The device is connected to the winding through a wiring contact. The short-circuit defect simulation component is set inside the isolation bucket and the insulating oil inside the isolation bucket is used for simulation. When disassembling, only the oil inside the isolation bucket needs to be drained.
It simplifies the disassembly and maintenance process, reduces oil draining time and operational complexity, and improves disassembly and assembly efficiency.
Smart Images
Figure CN120669024B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of power equipment technology, and specifically relates to a transformer defect simulation test device. Background Technology
[0002] Transformers are one of the most important pieces of equipment in a power system. They are expensive to manufacture and difficult to maintain. Once a transformer fails, it can cause huge losses to the power system.
[0003] Approximately two-thirds of transformer faults are winding faults, with inter-turn short circuits being the most common. Although minor inter-turn faults do not affect transformer operation in the short term, most serious transformer faults develop from minor inter-turn short circuits. Short circuits in two-phase windings are relatively rare, mostly caused by improper operation by personnel during assembly and maintenance. Inter-turn or phase-to-phase short circuits in transformer windings often lead to large short-circuit currents, severe transformer vibration, and accelerated temperature rise. Therefore, conducting simulations of inter-turn and phase-to-phase short-circuit faults in transformers and studying their related characteristics is of great significance.
[0004] Currently, short-circuit fault simulation devices are typically installed on transformers to artificially induce inter-turn short circuits and simulate faults. However, existing short-circuit fault simulation devices are usually inconvenient to disassemble and maintain. Summary of the Invention
[0005] This invention provides a transformer defect simulation test device, which aims to solve the technical problem that existing short-circuit defect simulation devices are usually inconvenient to disassemble and maintain.
[0006] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a transformer defect simulation test device, comprising:
[0007] An isolation barrel is suitable for installation on a transformer, with its lower end extending into the transformer. The isolation barrel contains insulating oil, and the internal space of the isolation barrel is isolated from the internal space of the transformer.
[0008] Wiring contacts are spaced apart on the isolation barrel, connected to and passing through the isolation barrel. The wiring contacts are located at one end outside the isolation barrel and are used to make conductive connections to the windings of the transformer via wires. There are at least two wiring contacts, which are respectively electrically connected to different windings of the transformer.
[0009] A short-circuit fault simulation component is disposed inside the isolation barrel. The short-circuit fault simulation component is connected to one end of the wiring contact disposed inside the isolation barrel via a wire, so as to short-circuit the two windings.
[0010] In one possible implementation of the transformer defect simulation test device provided by the present invention, the short-circuit defect simulation component includes:
[0011] The first insulating tube extends through the top of the isolation barrel at its upper end;
[0012] A power-gathering component is connected to the lower end of the first insulating tube. The power-gathering component has a first conductive module and a second conductive module that are insulated from each other. The first conductive module is electrically connected to one of the wiring contacts via a wire, and the second conductive module is electrically connected to the other wiring contact via a wire.
[0013] The short-circuit discharge component can make or break contact with the first conductive module and the second conductive module by moving. When it moves to the first position, the first conductive module and the second conductive module make conductive contact; when it moves to the second position, the first conductive module and the second conductive module break away.
[0014] In one possible implementation of the transformer defect simulation test device provided by the present invention, the first conductive module includes a power taking ring, which is coaxially connected to the lower end of the first insulating tube; the power taking ring is electrically connected to one of the wiring contacts through a wire.
[0015] The second conductive module includes a conductive head, which is connected to another of the wiring contacts via a wire;
[0016] The power-collecting component further includes a second insulating tube, which is disposed between the power-collecting ring and the conductive head, with its two ends connected to the power-collecting ring and the conductive head respectively;
[0017] The short-circuit discharge component is installed inside the power-taking ring and the second insulating tube, and slides axially with the power-taking ring.
[0018] When the short-circuit discharge component moves downward to the first position, the short-circuit discharge component is electrically connected to the power-taking ring, and its lower end is electrically connected to the conductive head, so as to short-circuit the two windings;
[0019] When the short-circuit discharge component moves upward to the second position, its lower end is disconnected from the conductive head, thereby disconnecting the two windings.
[0020] In one possible implementation of the transformer defect simulation test device provided by the present invention, the first conductive module further includes a contact spring, an annular groove is provided on the inner wall of the power taking ring, the contact spring is embedded in the annular groove and electrically connected to the power taking ring, the short-circuit discharge component passes through the contact spring, slides with the contact spring axially, and squeezes the contact spring radially along the power taking ring.
[0021] When the short-circuit discharge component moves downward to the first position, the short-circuit discharge component contacts and is electrically connected to the power-taking ring and the contact finger spring, and its lower end is electrically connected to the conductive head, so as to short-circuit the two windings.
[0022] In one possible implementation of the transformer defect simulation test device provided by the present invention, the second conductive module further includes a buffer spring, which is disposed inside the second insulating tube and connected to the top of the conductive head for conductive engagement.
[0023] When the short-circuit discharge component moves downward to the first position, the short-circuit discharge component contacts and is electrically connected to the power-taking ring and the contact finger spring, and its lower end abuts against and conducts electricity with the buffer spring, so as to short-circuit the two windings.
[0024] In one possible implementation of the transformer defect simulation test device provided by the present invention, a plurality of second oil inlets are provided on the side of the second insulating tube so that the insulating oil in the isolation barrel can enter the second insulating tube.
[0025] In one possible implementation of the transformer defect simulation test device provided by the present invention, the short-circuit discharge component includes:
[0026] An insulating rod is coaxially inserted inside the first insulating tube and slides in conjunction with the first insulating tube.
[0027] A drive assembly is connected to the isolation bucket, and the power output end of the drive assembly is connected to the insulating rod to drive the insulating rod to slide in the axial direction;
[0028] A discharge module is connected to the lower end of the insulating rod. The discharge module passes through the power-taking ring and the second insulating tube and slides axially with the power-taking ring.
[0029] When the driving component drives the discharge module to move to the first position, the upper end of the discharge module contacts and is electrically connected to the power-taking ring, and the lower end is electrically connected to the conductive head, so as to short-circuit the two windings.
[0030] In one possible implementation of the transformer defect simulation test device provided by the present invention, the discharge module includes:
[0031] An insulating sleeve is inserted into the power-taking ring and the second insulating tube, and slides axially with the power-taking ring. Several third oil inlets are provided on the side to allow the insulating oil in the second insulating tube to enter the insulating sleeve.
[0032] The upper contact is fixed to the lower end of the insulating rod and is also connected to the upper end of the insulating sleeve, and is coaxial and of the same diameter as the insulating sleeve;
[0033] A conductive rod is inserted inside the insulating sleeve and located below the upper contact, and is electrically connected to the upper contact;
[0034] The upper electrode is located at the lower end of the conductive rod and is electrically connected to the conductive rod.
[0035] The lower contact is connected to the lower end of the insulating sleeve and is spaced apart from the upper electrode;
[0036] The lower electrode is located below the upper electrode and is electrically connected to the lower contact; the lower electrode is electrically coupled to the upper electrode.
[0037] When the driving component drives the discharge module to move down to the first position, the upper contact makes conductive contact with the power-taking ring, and the lower contact is electrically connected to the conductive head, so as to short-circuit the two windings; when the driving component drives the discharge module to move up to the second position, the upper contact separates from the power-taking ring, and the lower contact separates from the conductive head, so as to disconnect the two windings.
[0038] In one possible implementation of the transformer defect simulation test device provided by the present invention, a sealing assembly is further included. The sealing assembly is disposed on the top of the isolation barrel and is sealed to the isolation barrel. The upper end of the insulating rod is provided with a sealing part, which passes through the sealing assembly and slides and seals with the sealing assembly.
[0039] In one possible implementation of the transformer defect simulation test device provided by the present invention, the sealing assembly includes:
[0040] A sealing seat is sealed to the isolation barrel. The sealing seat has a sliding hole and a groove on the side wall of the sliding hole. The sealing part is slidably disposed in the sliding hole.
[0041] An oil seal is disposed within the slot and is tightly fitted to the outer periphery of the sealing portion;
[0042] A sealing ring is embedded in the lower side of the sealing seat and fits tightly against the upper surface of the isolation barrel.
[0043] The beneficial effects of the transformer defect simulation test device provided by the present invention are as follows: Compared with the prior art, the transformer defect simulation test device provided by the present invention installs an isolation bucket on the transformer and connects it to the transformer windings through several wiring contacts on the side wall of the isolation bucket. This allows the short-circuit defect simulation component to be placed inside the isolation bucket, which can then connect to the windings through the wiring contacts and short-circuit the windings to complete the defect simulation. Since the internal space of the isolation bucket is isolated from the transformer, when it is necessary to repair or disassemble the short-circuit defect simulation component, it is only necessary to drain the oil in the isolation bucket, without needing to drain the oil from the transformer. Furthermore, the amount of oil in the isolation bucket is much less than that in the transformer, resulting in shorter draining time and simpler operation. Therefore, it is more convenient to disassemble and repair the device. Attached Figure Description
[0044] Figure 1 This is a schematic diagram of the main structure of the transformer defect simulation test device provided in an embodiment of the present invention;
[0045] Figure 2 For along Figure 1 Cross-sectional view of line AA in the middle;
[0046] Figure 3 for Figure 2 Enlarged view of part A in the image;
[0047] Figure 4 for Figure 2 Enlarged view of part B in the image;
[0048] Figure 5 A three-dimensional structural schematic diagram of the short-circuit defect simulation component in the transformer defect simulation test device provided in an embodiment of the present invention;
[0049] Figure 6 A three-dimensional structural diagram of the discharge module in the transformer defect simulation test device provided in an embodiment of the present invention;
[0050] Explanation of reference numerals in the attached figures:
[0051] 10. Isolation container; 11. Wiring contact; 12. Container body; 13. Container lid;
[0052] 20. First insulating tube; 21. First oil inlet;
[0053] 31. Voltage-taking ring; 32. Contact finger spring; 33. Second insulating tube; 34. Second oil inlet;
[0054] 35. Conductive head; 36. Buffer spring; 41. Insulating rod; 42. Sealing part; 43. Drive assembly;
[0055] 51. Insulating sleeve; 52. Third oil port; 53. Upper contact; 54. Conductive rod; 55. Upper electrode;
[0056] 56. Lower contact; 57. Lower electrode; 61. Sealing seat; 62. Oil seal; 63. Sealing ring. Detailed Implementation
[0057] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.
[0058] 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 a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is actually illustrative only and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0059] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0060] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
[0061] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.
[0062] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.
[0063] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.
[0064] The inventors discovered that existing transformer defect simulation modules are typically installed directly inside the transformer, immersed in the transformer's insulating oil. To replenish the insulating oil in a timely manner, an oil replenishment tank is usually provided. However, the oil level in the replenishment tank is higher than the oil level inside the transformer. Therefore, when installing, removing, or repairing the defect simulation module, it is usually necessary to first drain the oil from the replenishment tank through the transformer's drain port, and then drain a portion of the oil from the transformer until the operational requirements are met. This process involves a large volume of oil to be drained and a lengthy draining time, making it inconvenient to remove, install, or repair the defect simulation module. To address this, a transformer defect simulation testing device is proposed.
[0065] Please refer to the following: Figures 1 to 6The transformer defect simulation test device provided by the present invention will now be described. The transformer defect simulation test device includes an isolation barrel 10, connecting contacts 11, and a short-circuit defect simulation component. The isolation barrel 10 is suitable for installation on a transformer, with its lower end extending into the transformer. The isolation barrel 10 contains insulating oil, and its internal space is isolated from the internal space of the transformer. The connecting contacts 11 are spaced apart on the isolation barrel 10, connected to and passing through it. One end of the connecting contacts 11 is located outside the isolation barrel 10 and is used to electrically connect to the transformer windings via wires. At least two connecting contacts 11 are provided, each electrically connected to a different winding of the transformer. The short-circuit defect simulation component is located inside the isolation barrel 10 and is connected to the end of the connecting contacts 11 located inside the isolation barrel 10 via wires, so as to short-circuit the two windings.
[0066] Specifically, the isolation barrel 10 consists of a barrel body 12 and a barrel cover 13. The upper outer ring of the barrel body 12 is integrally provided with a mounting flange, which is fixedly connected to the transformer by bolts, thereby installing the isolation barrel 10 onto the transformer. The barrel cover 13 is bolted to the barrel body and has an oil port for filling and draining oil. The wiring contact 11 is an existing device, such as a conductive rod 54, a conductive sheet, or the wiring contact 11 on an existing on-load switch, as long as it can connect to a wire and perform a conductive function. In this embodiment, the wiring contact 11 is the wiring contact 11 on a VCM type on-load switch. The wiring contacts 11 are mutually insulated.
[0067] In one specific embodiment, the barrel body 12 is made of insulating materials such as plastic.
[0068] In another specific implementation, the barrel body 12 is made of conductive materials such as stainless steel, iron or aluminum alloy, and the wiring contact 11 is insulated from the barrel body 12. Specifically, an insulating layer such as a rubber layer is provided between the wiring contact 11 and the barrel body 12.
[0069] Compared with the prior art, the transformer defect simulation test device provided in this embodiment of the invention installs an isolation barrel 10 on the transformer and connects it to the transformer windings through several wiring contacts 11 on the side wall of the isolation barrel 10. This allows the short-circuit defect simulation component to be placed inside the isolation barrel 10, enabling it to connect to the windings through the wiring contacts 11 and short-circuit the windings, thus simulating the defect. Since the internal space of the isolation barrel 10 is isolated from the transformer, when maintenance or disassembly of the short-circuit defect simulation component is required, only the oil inside the isolation barrel 10 needs to be drained; there is no need to drain the transformer. Furthermore, the amount of oil in the isolation barrel 10 is far less than that in the transformer, resulting in shorter draining time and simpler operation, thus facilitating disassembly and maintenance.
[0070] like Figure 2 , Figure 4 and Figure 5 As shown, in a specific embodiment of the transformer defect simulation test device provided in this invention, the short-circuit defect simulation component includes a first insulating tube 20, a power-taking component, and a short-circuit discharge component. The upper end of the first insulating tube 20 penetrates the top of the isolation barrel 10. The power-taking component is connected to the lower end of the first insulating tube 20. The power-taking component has a first conductive module and a second conductive module that are insulated from each other. The first conductive module is electrically connected to one of the wiring contacts 11 through a wire, and the second conductive module is electrically connected to the other wiring contact 11 through a wire. The short-circuit discharge component can make conductive contact with or separate from the first conductive module and the second conductive module by moving. When it moves to the first position, the first conductive module and the second conductive module make conductive contact. When it moves to the second position, the first conductive module and the second conductive module separate.
[0071] Preferably, the second conductive module is spaced below the first conductive module. When the short-circuit discharge component moves downward to the first position, the first conductive module and the second conductive module make conductive contact; when it moves upward to the second position, the first conductive module and the second conductive module separate.
[0072] It should be noted that the first insulating tube 20 is made of insulating materials such as plastic and ceramic to separate the power taking component from the isolation bucket 10, confine the electrical energy within the isolation bucket 10, and prevent leakage and electric shock accidents.
[0073] Specifically, such as Figure 2 , Figure 4 and Figure 5 As shown, in a specific embodiment of the transformer defect simulation test device provided in this invention, the first conductive module includes a power taking ring 31, which is coaxially connected to the lower end of the first insulating tube 20; the power taking ring 31 is electrically connected to a wiring contact 11 through a wire; the second conductive module includes a conductive head 35, which is connected to another wiring contact 11 through a wire.
[0074] The power extraction assembly also includes a second insulating tube 33, which is disposed between the power extraction ring 31 and the conductive head 35, with its two ends connected to the power extraction ring 31 and the conductive head 35 respectively.
[0075] The short-circuit discharge component is installed inside the power-taking ring 31 and the second insulating tube 33, and slides axially with the power-taking ring 31.
[0076] When the short-circuit discharge assembly moves downward to the first position, the short-circuit discharge assembly is electrically connected to the power-taking ring 31 and its lower end is electrically connected to the conductive head 35, so as to short-circuit the two windings.
[0077] When the short-circuit discharge assembly moves upward to the second position, the lower end is disconnected from the conductive head 35, thereby disconnecting the two windings.
[0078] It should be noted that the first insulating tube 20 and the power taking ring 31 serve as guides. Several first oil inlets 21 are opened on the side of the first insulating tube 20 to make the inside of the first insulating tube 20 connected to the isolation tank 10, so as to facilitate the flow of oil.
[0079] Specifically, one end of a wire is connected to a terminal contact 11, and a screw is provided on the side of the conductive ring. The other end of the wire is fixed to the conductive ring by the screw, so that the conductive ring and the wire are connected. One end of another wire is connected to another terminal contact 11, and a screw is provided at the bottom of the conductive head 35. The other end of the wire is fixed to the conductive head 35 by the screw, so that the conductive head 35 and the wire are connected.
[0080] like Figure 4 As shown, in a specific embodiment of the transformer defect simulation test device provided in this invention, the first conductive module further includes a contact spring 32. An annular groove is provided on the inner wall of the power taking ring 31. The contact spring 32 is embedded in the annular groove and electrically connected to the power taking ring 31. The short-circuit discharge component passes through the contact spring 32, slides with the contact spring 32 axially, and compresses the contact spring 32 radially along the power taking ring 31.
[0081] When the short-circuit discharge assembly moves downward to the first position, the short-circuit discharge assembly contacts and is electrically connected to the power-taking ring 31 and the contact finger spring 32, and its lower end is electrically connected to the conductive head 35, so as to short-circuit the two windings.
[0082] Specifically, two finger springs 32 are provided circumferentially on the power-taking ring 31.
[0083] It should be noted that the contact spring 32 is a helical ring-shaped spring, which has advantages such as simple structure, convenient assembly, multiple contact points, good conductivity, strong current carrying capacity, and low wear. The contact spring 32 can transmit strong current in a small space and is suitable for various static or dynamic medium and high voltage environments. It can provide reliable current conduction under vibration, dynamic conditions, and impact loads.
[0084] The contact spring 32 significantly reduces contact resistance through a multi-point contact design. The contact resistance of a single turn is only 4–5 microohms, and the resistance can be as low as 0.1 microohms after multiple turns are connected in parallel, reducing current loss and heat generation to adapt to the high current scenarios of transformer short circuits.
[0085] like Figure 4 As shown, in a specific embodiment of the transformer defect simulation test device provided in this invention, the second conductive module further includes a buffer spring 36, which is disposed inside the second insulating tube 33 and connected to the top of the conductive head 35 for conductive engagement.
[0086] When the short-circuit discharge assembly moves downward to the first position, the short-circuit discharge assembly contacts and is electrically connected to the power-taking ring 31 and the contact finger spring 32, and the lower end abuts against the buffer spring 36 and conducts electricity to short-circuit the two windings.
[0087] Specifically, the buffer spring 36 has a U-shaped or C-shaped sheet structure, made of conductive materials such as aluminum or copper, and has a certain degree of elasticity and good conductivity. It can provide effective buffering when the short-circuit discharge component comes into contact with the buffer spring 36, avoiding rigid impact.
[0088] like Figure 5 As shown, in a specific embodiment of the transformer defect simulation test device provided in this invention, a plurality of second oil inlets 34 are provided on the side of the second insulating tube 33 so that the insulating oil in the isolation barrel 10 enters the second insulating tube 33, thereby immersing the short-circuit discharge component in the insulating oil to simulate the environment inside the transformer and make the simulation results more accurate. Preferably, three second oil inlets 34 are provided at equal intervals along the circumference on the side of the second insulating tube 33.
[0089] like Figure 2 and Figure 4 As shown, in a specific embodiment of the transformer defect simulation test device provided in this invention, the short-circuit discharge assembly includes an insulating rod 41, a drive assembly 43, and a discharge module. The insulating rod 41 is coaxially inserted into the first insulating tube 20 and slides in cooperation with the first insulating tube 20. The drive assembly 43 is connected to the isolation bucket 10, and the power output end of the drive assembly 43 is connected to the insulating rod 41 to drive the insulating rod 41 to slide relative to the first insulating tube 20 in the axial direction. The discharge module is connected to the lower end of the insulating rod 41 and is inserted into the power taking ring 31 and the second insulating tube 33, and slides in cooperation with the power taking ring 31 in the axial direction.
[0090] When the drive assembly 43 drives the discharge module to move to the first position, the upper end of the discharge module contacts and is electrically connected to the power take-up ring 31, and the lower end is electrically connected to the conductive head 35, so as to short-circuit the two windings.
[0091] During operation, the current-taking ring 31 is connected to one winding via a wire and a connecting contact 11, and the conductive head 35 is connected to the other winding via a wire and a connecting contact 11. The drive assembly 43 drives the insulating rod 41 to move downward, which in turn moves the discharge module downward. At this time, the upper end of the discharge module is conductively engaged with the current-taking ring 31, and the lower end is conductively engaged with the conductive head 35, making the current-taking ring 31 and the conductive head 35 conductive, thereby short-circuiting the two windings and discharging. The drive assembly 43 drives the insulating rod 41 to move upward, which disconnects the discharge module from the conductive head 35 and stops the discharge.
[0092] It should be noted that the drive component 43 can be a pneumatic cylinder, a hydraulic cylinder, an electric actuator, etc. When the drive component 43 is a pneumatic cylinder or a hydraulic cylinder, it is switched by an electromagnetic reversing valve.
[0093] The insulating rod 41 is made of insulating materials such as plastic and insulating ceramic to separate the power taking component from the isolation bucket 10, confine the electrical energy within the isolation bucket 10, and prevent leakage and electric shock accidents.
[0094] like Figure 4 and Figure 6 As shown, in a specific embodiment of the transformer defect simulation test device provided in this invention, the discharge module includes an insulating sleeve 51, an upper contact 53, a conductive rod 54, an upper electrode 55, a lower contact 56, and a lower electrode 57. The insulating sleeve 51 passes through the current-taking ring 31 and the second insulating tube 33, and slides axially with the current-taking ring 31. Several third oil inlets 52 are provided on the side to allow insulating oil in the second insulating tube 33 to enter the insulating sleeve 51. The upper contact 53 is fixed to the insulating rod 41. The lower end of the upper electrode 54 is connected to the upper end of the insulating sleeve 51 and is coaxial and of the same diameter as the insulating sleeve 51. The conductive rod 54 passes through the insulating sleeve 51 and is located below the upper contact 53, and is conductively connected to the upper contact 53. The upper electrode 55 is located at the lower end of the conductive rod 54 and is conductively connected to the conductive rod 54. The lower contact 56 is connected to the lower end of the insulating sleeve 51 and is spaced apart from the upper electrode 55. The lower electrode 57 is located below the upper electrode 55 and is conductively connected to the lower contact 56. The lower electrode 57 is conductively engaged with the upper electrode 55.
[0095] When the drive assembly 43 drives the discharge module to move down to the first position, the upper contact 53 makes conductive contact with the power taking ring 31, and the lower contact 56 is electrically connected to the conductive head 35, so that the two windings are short-circuited; when the drive assembly 43 drives the discharge module to move up to the second position, the upper contact 53 separates from the power taking ring 31, and the lower contact 56 separates from the conductive head 35, so that the two windings are disconnected.
[0096] It should be noted that the oil enters the insulating sleeve 51 through the second oil port 34 and the third oil port 52, placing the upper electrode 55 and the lower electrode 57 in the insulating oil to simulate the short-circuit environment of the winding, making the simulation results more realistic.
[0097] like Figure 3 and Figure 5 As shown, in a specific embodiment of the transformer defect simulation test device provided in this invention, a sealing component is also included. The sealing component is disposed on the top of the isolation barrel 10 and is sealed to the isolation barrel 10. The upper end of the insulating rod 41 is provided with a sealing part 42, which passes through the sealing component and is slidably sealed with the sealing component.
[0098] Specifically, the diameter of the sealing part 42 of the insulating rod 41 is larger than the diameter of other parts to save materials.
[0099] like Figure 3 and Figure 5 As shown, in a specific embodiment of the transformer defect simulation test device provided in this invention, the sealing assembly includes a sealing seat 61, an oil seal 62, and a sealing ring 63. The sealing seat 61 is sealed to the isolation barrel 10. The sealing seat 61 is provided with a sliding hole, and a groove is provided on the side wall of the sliding hole. The sealing part 42 is slidably disposed in the sliding hole. The oil seal 62 is disposed in the groove and is tightly fitted to the outer periphery of the sealing part 42. The sealing ring 63 is embedded in the lower side of the sealing seat 61 and is tightly fitted to the upper surface of the isolation barrel 10.
[0100] Specifically, the upper end of the first insulating tube 20 is inserted into the lower end of the sealing seat 61 and threadedly engaged with the sealing seat 61, thereby indirectly connecting to the top of the isolation barrel 10.
[0101] The oil seal 62 uses existing parts. The first insulating tube 20 cooperates with the sealing seat 61 to hold the oil seal 62 in place. To further improve the sliding sealing effect, two oil seals 62 are provided axially in the groove.
[0102] 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, and improvements 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 defect simulation test device, characterized in that, include: An isolation bucket (10) is suitable for installation on a transformer, with its lower end extending into the transformer. The isolation bucket (10) contains insulating oil, and the internal space of the isolation bucket (10) is isolated from the internal space of the transformer. A wiring contact (11) is spaced apart on the isolation barrel (10), connected to and passing through the isolation barrel (10). The wiring contact (11) is located at one end outside the isolation barrel (10) and is used to make a conductive connection with the winding of the transformer through a wire. There are at least two wiring contacts (11), which are electrically connected to different windings of the transformer respectively. A short-circuit fault simulation component is provided inside the isolation barrel (10). The short-circuit fault simulation component is connected to one end of the wiring contact (11) located inside the isolation barrel (10) via a wire to short-circuit the two windings. The short-circuit defect simulation component includes: The first insulating tube (20) extends through the top of the isolation barrel (10) at its upper end; A power-gathering assembly is connected to the lower end of the first insulating tube (20). The power-gathering assembly has a first conductive module and a second conductive module that are insulated from each other. The first conductive module is electrically connected to one of the wiring contacts (11) via a wire, and the second conductive module is electrically connected to the other wiring contact (11) via a wire. The short-circuit discharge component can make or break contact with the first conductive module and the second conductive module by moving. When it moves to the first position, the first conductive module and the second conductive module make conductive contact; when it moves to the second position, the first conductive module and the second conductive module break away. The first conductive module includes a power-taking ring (31), which is coaxially connected to the lower end of the first insulating tube (20); the power-taking ring (31) is electrically connected to a wiring contact (11) via a wire. The second conductive module includes a conductive head (35), which is connected to another wiring contact (11) via a wire; The power extraction assembly also includes a second insulating tube (33), which is disposed between the power extraction ring (31) and the conductive head (35), with its two ends connected to the power extraction ring (31) and the conductive head (35) respectively. The short-circuit discharge assembly is inserted into the power-taking ring (31) and the second insulating tube (33), and slides axially with the power-taking ring (31); When the short-circuit discharge assembly moves downward to the first position, the short-circuit discharge assembly is electrically connected to the power-taking ring (31), and its lower end is electrically connected to the conductive head (35) to short-circuit the two windings; When the short-circuit discharge component moves upward to the second position, its lower end is disconnected from the conductive head, thereby disconnecting the two windings.
2. The transformer defect simulation test device as described in claim 1, characterized in that, The first conductive module also includes a finger spring (32). An annular groove is provided on the inner wall of the power taking ring (31). The finger spring (32) is embedded in the annular groove and electrically connected to the power taking ring (31). The short-circuit discharge component passes through the finger spring (32), slides with the finger spring (32) axially, and compresses the finger spring (32) radially along the power taking ring (31). When the short-circuit discharge assembly moves downward to the first position, the short-circuit discharge assembly contacts and is electrically connected to the power-taking ring (31) and the contact finger spring (32), and its lower end is electrically connected to the conductive head (35) to short-circuit the two windings.
3. The transformer defect simulation test device as described in claim 2, characterized in that, The second conductive module further includes a buffer spring (36), which is disposed inside the second insulating tube (33) and connected to the top of the conductive head (35) for conductive engagement; When the short-circuit discharge assembly moves downward to the first position, the short-circuit discharge assembly contacts and is electrically connected to the power-taking ring (31) and the contact finger spring (32), and its lower end abuts against and conducts electrical contact with the buffer spring (36) to short-circuit the two windings.
4. The transformer defect simulation test device as described in claim 1, characterized in that, The second insulating tube (33) has several second oil inlets (34) on its side so that the insulating oil in the isolation barrel can enter the second insulating tube.
5. The transformer defect simulation test device as described in claim 4, characterized in that, The short-circuit discharge assembly includes: An insulating rod (41) is coaxially inserted inside the first insulating tube (20) and slides in cooperation with the first insulating tube (20); The drive assembly (43) is connected to the isolation bucket (10), and the power output end of the drive assembly (43) is connected to the insulating rod (41) to drive the insulating rod (41) to slide in the axial direction; The discharge module is connected to the lower end of the insulating rod (41). The discharge module passes through the power taking ring (31) and the second insulating tube (33) and slides axially with the power taking ring (31). When the driving component (43) drives the discharge module to move to the first position, the upper end of the discharge module contacts and is electrically connected to the power taking ring (31), and the lower end is electrically connected to the conductive head (35) so that the two windings are short-circuited.
6. The transformer defect simulation test device as described in claim 5, characterized in that, The discharge module includes: An insulating sleeve (51) is inserted into the power taking ring (31) and the second insulating tube (33) and slides axially with the power taking ring (31). Several third oil inlets (52) are provided on the side so that the insulating oil in the second insulating tube can enter the insulating sleeve (51). The upper contact (53) is fixed to the lower end of the insulating rod (41) and is also connected to the upper end of the insulating sleeve (51), and is coaxial and of the same diameter as the insulating sleeve (51); The conductive rod (54) passes through the insulating sleeve (51) and is located below the upper contact (53), and is electrically connected to the upper contact (53); The upper electrode (55) is located at the lower end of the conductive rod (54) and is electrically connected to the conductive rod (54); The lower contact (56) is connected to the lower end of the insulating sleeve (51) and is spaced apart from the upper electrode (55); The lower electrode (57) is located below the upper electrode (55) and is electrically connected to the lower contact (56); the lower electrode (57) is electrically engaged with the upper electrode (55); When the driving component drives the discharge module to move down to the first position, the upper contact (53) makes conductive contact with the power taking ring (31), and the lower contact (56) is electrically connected to the conductive head (35) to short-circuit the two windings; when the driving component drives the discharge module to move up to the second position, the upper contact (53) separates from the power taking ring (31), and the lower contact (56) separates from the conductive head (35) to disconnect the two windings.
7. The transformer defect simulation test device as described in claim 5, characterized in that, It also includes a sealing assembly, which is located on the top of the isolation barrel (10) and is sealed to the isolation barrel (10); the upper end of the insulating rod (41) is provided with a sealing part (42), which passes through the sealing assembly and is slidably sealed with the sealing assembly.
8. The transformer defect simulation test device as described in claim 7, characterized in that, The sealing assembly includes: A sealing seat (61) is sealed to the isolation bucket (10). The sealing seat (61) is provided with a sliding hole and a groove is provided on the side wall of the sliding hole. The sealing part (42) is slidably disposed in the sliding hole. An oil seal (62) is provided in the slot and fits tightly against the outer periphery of the sealing part (42); The sealing ring (63) is embedded on the lower side of the sealing seat (61) and fits tightly against the upper surface of the isolation barrel (10).