Change-over switch structure for switching voltage gears of adjustable resonance reactor

Abstract

The utility model discloses a change-over switch structure for switching voltage gears of an adjustable resonance reactor, and belongs to the technical field of power equipment. The structure is arranged in a shell of the adjustable resonance reactor and is connected with a reactor coil and an output end of a high-voltage porcelain bushing through a connecting wire. The device comprises an insulating stand column, a plurality of gear static tool bits are arranged on the insulating stand column and connected with voltage gear connecting points through reactor gear connecting lines, and a high-voltage output connecting position is arranged at the bottom of the insulating stand column. The transmission motor on the top plate of the oil tank drives the insulation transmission rod to rotate, then the movable tool bit is controlled to be connected or disconnected with the static tool bits of different gears, voltage gear switching is achieved, and accurate control is achieved through the limiting switch baffle and the limiting switch. The change-over switch structure is simple, convenient and accurate to operate and high in stability and reliability, the problems of complicated operation, poor stability, poor insulativity and the like of a change-over switch in the prior art are effectively solved, and the overall performance and reliability of a power capacitor test system are improved.

Description

Technical Field

[0001] This utility model relates to the field of power equipment technology, and in particular to a switching switch structure for switching the voltage levels of an adjustable resonant reactor. Background Technology

[0002] During the production and testing of power capacitors, various rigorous tests are required, such as overvoltage cycle tests and aging tests, to ensure product quality and performance reliability. Adjustable resonant reactors, as key equipment in the testing system, can form a resonant circuit with the power capacitor under test, providing appropriate test voltage and current. However, different specifications of power capacitors have different requirements for test voltage, necessitating that adjustable resonant reactors have the ability to flexibly switch voltage levels.

[0003] Traditional voltage level switching methods for adjustable resonant reactors have several shortcomings. For example, some switching structures are complex to operate, making it difficult to achieve fast and accurate level switching, thus affecting test efficiency; some structures have poor stability and reliability, and are prone to failure during frequent switching, leading to test interruptions or even equipment damage; some switching structures also have poor insulation performance, posing safety hazards. Furthermore, with the continuous development of power capacitor technology, the requirements for test systems are becoming increasingly stringent, and traditional switching structures can no longer meet the modern demands for efficient, accurate, and safe testing.

[0004] While existing technologies employ similar switching structures to achieve voltage level switching, they suffer from shortcomings in structural design, ease of operation, safety, and compatibility with testing systems. For example, some structures are prone to generating electric arcs during switching, which can not only affect the lifespan of the equipment but also pose a threat to the safety of testing personnel; the control methods of some structures are not intelligent enough and cannot effectively coordinate with the automated control of the testing system. Therefore, developing a novel switching structure for switching the voltage levels of an adjustable resonant reactor is of significant practical importance. Utility Model Content

[0005] This utility model aims to provide a switching switch structure for switching the voltage levels of an adjustable resonant reactor, solving the problems of complex operation, poor stability, inadequate insulation performance, and low level of intelligence in existing switching switches. It achieves fast, accurate, safe, and stable voltage level switching, improving the overall performance and reliability of the power capacitor testing system. The specific solution is as follows:

[0006] A switching structure for switching voltage levels of an adjustable resonant reactor is provided. The switching structure is located inside the housing of the adjustable resonant reactor. The adjustable resonant reactor has an oil tank top plate and an upper cover. A reactor coil is provided inside the adjustable resonant reactor. The reactor coil has multiple voltage level connection points. A high-voltage porcelain bushing output terminal is provided at one end of the outside of the adjustable resonant reactor. The switching structure is connected between the reactor coil and the high-voltage porcelain bushing output terminal.

[0007] The switching structure includes a cylindrical insulating column, which is fixedly installed on the lower surface of the top plate of the oil tank by fasteners;

[0008] Multiple stationary blades with different speed ranges are connected circumferentially through the side wall of the insulating column. Each stationary blade is connected to a voltage level connection point via a reactor speed range connection line. A high-voltage output connection point for connecting the output terminal of the high-voltage porcelain bushing is provided at the bottom of the insulating column.

[0009] A drive motor is fixedly installed on the top plate of the fuel tank. The output end of the drive motor is connected to an insulated drive rod. The insulated drive rod passes downward through the top plate of the fuel tank and extends into the interior of an insulated column. Inside the insulated column, the insulated drive rod is connected to a moving cutter head. The moving cutter head is electrically connected to a high-voltage output connection point. The drive motor drives the insulated drive rod to rotate so as to disconnect the moving cutter head from the stationary cutter head of the gear position, or connect the moving cutter head to one of the stationary cutter heads of the gear position.

[0010] The top of the insulated transmission rod is connected to a limit switch baffle. Multiple limit switches are installed on the rotation path of the limit switch baffle. The multiple limit switches are connected to the transmission motor. The limit switch baffle rotates synchronously with the insulated transmission rod and triggers the limit switches to control the transmission motor.

[0011] Furthermore, the insulating transmission rod is pultruded from epoxy resin glass fiber composite material, and a carbon steel mandrel is provided inside the insulating transmission rod. A double sealing structure consisting of a fluororubber O-ring and a polytetrafluoroethylene retaining ring is provided between the insulating transmission rod and the top plate of the insulating column.

[0012] Furthermore, the insulated transmission rod is a ceramic rod.

[0013] Furthermore, the moving cutter head includes a fixed crossbar and a conductive component. One end of the fixed crossbar is fixedly mounted on the insulating transmission rod by a clamping component, and the other end is equipped with a conductive component. The conductive component is provided with a conductive groove that is electrically connected to the stationary cutter head of the gear position.

[0014] Furthermore, the limit switch includes Hall sensors corresponding to the positions of the stationary blades at multiple gear positions, and magnets for cooperating with the Hall sensors are installed on the limit switch baffle.

[0015] Furthermore, the drive motor is a stepper motor, which is connected to the insulated drive rod via a gear set.

[0016] Furthermore, the insulating column consists of a cylindrical outer shell and upper and lower end caps, which are inserted into the upper and lower ends of the cylindrical outer shell and fastened with bolts.

[0017] The lower end cover is equipped with a bearing that is rotatably connected to the bottom of the insulated transmission rod.

[0018] Furthermore, a conductive turntable electrically connected to the conductive components is fixed at the bottom of the insulated transmission rod.

[0019] The high-voltage output connection point is connected through the lower end cover, and the high-voltage output connection point has a conductive column inside the insulating column that is electrically connected to the conductive turntable.

[0020] The beneficial effects of this utility model are as follows:

[0021] 1. Simple and precise operation: Through the cooperation of the drive motor, insulated drive rod and limit switch, the moving head can be rotated quickly and accurately, and accurately switched to the required voltage level. The operation is simple and convenient, which improves the efficiency of the test.

[0022] 2. High stability and reliability: The use of multiple sealing structures and stable mechanical connection methods, such as the double sealing structure between the insulating transmission rod and the insulating column, and the fixing method between the moving knife head and the insulating transmission rod, effectively improves the stability and reliability of the switching structure, reduces the probability of failure, and ensures the smooth progress of the test process.

[0023] 3. Excellent insulation performance: The insulating column adopts a cylindrical design, selects appropriate insulating materials, and takes effective insulation measures at each connection point, such as insulation treatment of the reactor coil and material selection of the insulating transmission rod, which greatly improves the insulation performance of the entire switching structure and ensures the safety of test personnel and equipment.

[0024] 4. Good compatibility: This switching structure can work well with other equipment in the parallel resonant overvoltage cycle and aging test system for power capacitors, adapting to the test requirements of power capacitors of different specifications, and has strong versatility and compatibility. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram showing the switching structure of this utility model installed inside the housing of an adjustable resonant reactor;

[0027] Figure 2 This is an enlarged structural diagram of the switching mechanism.

[0028] Explanation of reference numerals in the attached figures:

[0029] 100 - Adjustable resonant reactor, 110 - Tank top plate, 120 - Upper cover, 130 - Reactor coil, 140 - High voltage porcelain bushing output terminal;

[0030] 200-Changeover switch structure, 201-First connecting line, 202-Second connecting line, 210-Insulating column, 220-Gate stationary knife head, 240-High voltage output connection position, 250-Drive motor, 260-Insulating transmission rod, 261-Conductive turntable, 270-Moving knife head, 271-Fixed crossbar, 272-Conductive component, 273-Clamping component, 274-Conductive cross groove, 280-Limit switch baffle, 290-Limit switch. Detailed Implementation

[0031] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0032] To fully understand this utility model, detailed steps and structures will be presented in the following description to illustrate the technical solution of this utility model. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0033] Reference Figure 1-2 As shown, this utility model provides a switching switch structure 200 for switching the voltage levels of an adjustable resonant reactor 100. The switching switch structure 200 is disposed inside the housing of the adjustable resonant reactor 100. The adjustable resonant reactor 100 has an oil tank top plate 110 and an upper cover 120. A reactor coil 130 is disposed inside the adjustable resonant reactor 100, and the reactor coil 130 has multiple voltage level connection points. In an optional embodiment, the reactor coil 130 is wound in a multi-layer cylindrical manner, with 0.15mm thick Nomex insulating paper used for interlayer insulation. During the winding of the reactor coil 130, the winding process must be strictly controlled to ensure that the number of turns in each layer of coil is uniform, and that the interlayer insulating paper is laid flat, without wrinkles or damage, to ensure good insulation performance. A high-voltage porcelain bushing output terminal 140 is provided at one end of the adjustable resonant reactor 100.

[0034] The switching structure 200 is connected between the reactor coil 130 and the high-voltage porcelain bushing output terminal 140 via the first connecting line 201 and the second connecting line 202.

[0035] The changeover switch structure 200 includes a cylindrical insulating column 210, which is fixedly installed on the lower surface of the tank top plate 110 using fasteners. When installing the insulating column 210, ensure the fasteners are tightened to guarantee a secure connection between the insulating column 210 and the tank top plate 110, preventing loosening during equipment operation and ensuring the normal operation of the changeover switch. Simultaneously, the installation position of the insulating column 210 should be precisely calibrated to ensure its relative position to other components meets design requirements, guaranteeing the accuracy of the fit between the stationary and moving cutter heads for each gear position.

[0036] Multiple stationary blades 220 with different voltage settings are circumferentially connected to the side wall of the insulating column 210. Each stationary blade 220 is connected to a voltage setting connection point via a first connecting line 201. During connection, it is crucial to ensure reliable connection between the first connecting line 201, the stationary blade 220, and the voltage setting connection point. Appropriate connection methods, such as welding or crimping, should be employed to ensure electrical connection stability, reduce contact resistance, and prevent overheating under high current. A high-voltage output connection position 240 is located at the bottom of the insulating column 210. This high-voltage output connection position 240 is electrically connected to the high-voltage porcelain bushing output terminal 140 via a second connecting line 202. Similarly, the connection of the second connecting line 202 must be secure, and proper insulation treatment must be applied at the connection point to prevent leakage risks.

[0037] A drive motor 250 is fixedly installed on the top plate 110 of the fuel tank. The output end of the drive motor 250 is connected to an insulated drive rod 260. During installation, the axis of the drive motor 250 must be concentric with the axis of the insulated drive rod 260 to reduce eccentricity during transmission and avoid vibration and wear caused by eccentricity. The insulated drive rod 260 extends downwards through the top plate 110 of the fuel tank and into the interior of the insulated column 210. A movable cutter head 270 is connected to the insulated drive rod 260 inside the insulated column 210. The movable cutter head 270 is electrically connected to the high-voltage output connection position 240. The fixed crossbar 271 of the movable cutter head 270 is fixedly installed on the insulated drive rod 260 by a clamping component 273. When installing the clamping component 273, it must be ensured that it tightly clamps the fixed crossbar 271 to prevent the movable cutter head 270 from loosening during rotation, which would affect conductivity and switching accuracy.

[0038] A limit switch baffle 280 is connected to the top of the insulating transmission rod 260. Multiple limit switches 290 are installed along the rotation path of the limit switch baffle 280, and these limit switches 290 are connected to the drive motor 250. When installing the limit switches 290, their installation positions must be precisely adjusted according to the different positions to ensure that the limit switch baffle 280 can accurately trigger the limit switches 290 when the insulating transmission rod 260 rotates to the corresponding position, thus achieving precise control of the drive motor 250. Simultaneously, the electrical connection between the limit switches 290 and the drive motor 250 must be rigorously checked to ensure the accuracy and stability of signal transmission.

[0039] In one optional embodiment, the insulating transmission rod 260 is pultruded from epoxy resin glass fiber composite material. A carbon steel mandrel is installed inside the insulating transmission rod 260. A double sealing structure consisting of a fluororubber O-ring and a polytetrafluoroethylene (PTFE) retaining ring is provided between the insulating transmission rod 260 and the top plate of the insulating column 210. The installation of this sealing structure must be strictly carried out according to process requirements. First, the fluororubber O-ring is fitted onto the insulating transmission rod 260, ensuring accurate positioning and no twisting. Then, the PTFE retaining ring is installed to further enhance the sealing effect, ensuring the insulation performance of the equipment and the normal operation of the transmission components. In another optional embodiment, the insulating transmission rod 260 can also be a ceramic rod. When selecting a ceramic rod, attention should be paid to the material quality and processing precision of the ceramic rod. During installation, the ceramic rod should be protected from impact to prevent damage, ensuring its good insulation and mechanical properties.

[0040] In an optional embodiment, the movable cutter head 270 includes a fixed crossbar 271 and a conductive component 272. The conductive component 272 has a conductive groove 274 that is electrically connected to the stationary cutter head 220. When the movable cutter head 270 rotates to a specific position, the stationary cutter head 220 inserts into the conductive groove 274 to achieve an electrical connection with the movable cutter head 270.

[0041] In an optional embodiment, the limit switch 290 includes a Hall sensor corresponding to the position of the stationary blade 220 at multiple gear positions, and a magnet for cooperating with the Hall sensor is mounted on the limit switch baffle 280. When installing the magnet, it is essential to ensure that its polarity is correct and that it is securely installed, and that the cooperation accuracy with the Hall sensor meets design requirements to ensure accurate triggering of the Hall sensor, thereby achieving precise control of the drive motor 250 and ensuring that the moving blade 270 accurately stops at the target gear position.

[0042] In an optional embodiment, the drive motor 250 is a stepper motor, which is connected to the insulated drive rod 260 via a gear set.

[0043] In an optional embodiment, the insulating column 210 consists of a cylindrical outer shell and upper and lower end caps, which are respectively inserted into the upper and lower ends of the cylindrical outer shell and fastened with bolts. When assembling the insulating column 210, an appropriate amount of thread-locking adhesive should be applied to the bolt connections to prevent the bolts from loosening during equipment operation. The lower end cap is equipped with a bearing that rotatably connects to the bottom of the insulating transmission rod 260. The bearing ensures the precision of its fit with the insulating transmission rod 260 and the lower end cap, and proper lubrication reduces rotational friction, ensuring smooth rotation of the insulating transmission rod 260.

[0044] A conductive turntable 261, electrically connected to the conductive component 272, is fixed at the bottom of the insulating transmission rod 260. A high-voltage output connection position 240 is connected through the lower end cover. Inside the insulating column, the high-voltage output connection position 240 has a conductive post that is slidably electrically connected to the conductive turntable 261. When installing the conductive turntable 261 and the conductive post, it is necessary to ensure good sliding contact between the two, a smooth surface of the conductive post, flexible rotation of the conductive turntable 261, and good conductivity of the contact parts to ensure stable current transmission during voltage level switching.

[0045] Instructions for the operation of the switching device in the power capacitor testing system:

[0046] 1. Initial State: Before the test begins, the moving blade of the switch is connected to the stationary blade of a certain setting. At this time, the reactor coil is connected to the output terminal of the high-voltage porcelain bushing through this connection, providing the initial voltage setting for the test. The limit switch baffle at the top of the insulating transmission rod maintains its initial position relationship with the corresponding limit switch, the drive motor is in standby mode, and the entire system is in a stable initial state, awaiting the test command. In this initial state, a comprehensive inspection of the entire system should be conducted, including whether the connections of each component are secure, whether the electrical connections are normal, and whether the insulation performance is good, to ensure that the system is in optimal condition before the test.

[0047] 2. Receiving a switching command: When the test system needs to switch the voltage level of the adjustable resonant reactor according to the test requirements of different power capacitors, the industrial control computer will issue a level selection command. This command is transmitted to the drive motor through the electrical circuit. During the command transmission process, it is necessary to ensure that the electrical circuit connection is reliable and free from faults such as short circuits and open circuits, to ensure that the command can be transmitted to the drive motor accurately.

[0048] 3. Drive Motor Start-up: Upon receiving the command, the drive motor begins operation. The motor's operation drives the insulated drive rod to rotate. As the insulated drive rod rotates, the moving cutter head mounted at its lower end also rotates synchronously. The fixed crossbar of the moving cutter head is securely fixed to the insulated drive rod by a clamping device, ensuring stable rotation of the moving cutter head. The conductive components of the moving cutter head gradually disengage from the currently connected stationary cutter head and rotate towards the target stationary cutter head. During the start-up and rotation of the drive motor, the motor's operating status, including parameters such as speed and current, must be monitored to ensure normal motor operation. If any abnormality is detected, the machine should be stopped immediately for inspection. Simultaneously, the rotation of the moving cutter head should be observed to ensure smooth rotation without any jamming.

[0049] 4. Approaching the Target Gear: As the moving cutter head approaches the stationary cutter head at the target gear, the limit switch baffle at the top of the insulated transmission rod also rotates. The magnet mounted on the limit switch baffle gradually approaches the Hall sensor in the limit switch corresponding to the target gear. During this process, it is essential to ensure that the limit switch baffle and the magnet are securely installed without any looseness, guaranteeing accurate triggering of the Hall sensor. Simultaneously, the sensitivity of the Hall sensor should be calibrated periodically to ensure accurate detection of the magnet's approach.

[0050] 5. Precise Positioning: When the magnet on the limit switch baffle reaches the sensing range of the target limit switch, the Hall sensor is triggered, generating an electrical signal. This signal is fed back to the control system, which immediately issues a command to stop the drive motor. At this time, the moving cutter head accurately connects with the target gear stationary cutter head. The corresponding voltage gear of the reactor coil is connected to the output terminal of the high-voltage porcelain bushing through the stationary cutter head, the moving cutter head, and the high-voltage output connection, completing the voltage gear switching. In this process, the response speed of the control system is crucial; it must ensure timely and accurate control of the drive motor to stop rotation, achieving precise positioning of the moving cutter head. Simultaneously, the connection between the moving cutter head and the target gear stationary cutter head is checked to ensure reliable connection and good electrical contact.

[0051] 6. Test Implementation: After the switching is completed, the test system continues the overvoltage cycle or aging test of the power capacitor. If it is necessary to switch gears again during the test, repeat steps 2-5 above to meet the voltage requirements of different test stages. Throughout the test, the operating status of the switching switch must be continuously monitored, including the connection between the moving and stationary blades, insulation performance, etc. Any abnormalities should be addressed promptly to ensure the smooth progress of the test and the accuracy of the results.

[0052] The preferred embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above. Devices and structures not described in detail herein should be understood as being implemented in a conventional manner within the art. Any person skilled in the art can make many possible variations and modifications to the technical solutions of this utility model using the disclosed methods and techniques, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. This does not affect the essential content of this utility model. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the content of the technical solution of this utility model, still fall within the protection scope of the technical solution of this utility model.

Claims

1. A switching switch structure for switching voltage levels of an adjustable resonant reactor, wherein the switching switch structure is disposed within the housing of the adjustable resonant reactor, the adjustable resonant reactor has an oil tank top plate and an upper cover, a reactor coil is disposed inside the adjustable resonant reactor, the reactor coil has multiple voltage level connection points, and a high-voltage porcelain bushing output terminal is disposed at one end of the outer side of the adjustable resonant reactor, characterized in that... The switching structure is connected between the reactor coil and the output terminal of the high-voltage porcelain bushing; The switching structure includes a cylindrical insulating column, which is fixedly installed on the lower surface of the top plate of the oil tank by fasteners; Multiple stationary blades with different speed ranges are connected circumferentially through the side wall of the insulating column. Each stationary blade is connected to a voltage level connection point via a reactor speed range connection line. A high-voltage output connection point for connecting the output terminal of the high-voltage porcelain bushing is provided at the bottom of the insulating column. A drive motor is fixedly installed on the top plate of the fuel tank. The output end of the drive motor is connected to an insulated drive rod. The insulated drive rod penetrates downward through the top plate of the fuel tank and extends into the interior of an insulated column. Inside the insulated column, the insulated drive rod is connected to a moving cutter head. The moving cutter head is electrically connected to a high-voltage output connection point. The drive motor drives the insulated drive rod to rotate, thereby disconnecting the moving cutter head from the stationary cutter head of the gear position, or connecting the moving cutter head to one of the stationary cutter heads of the gear position. The top of the insulated transmission rod is connected to a limit switch baffle. Multiple limit switches are installed on the rotation path of the limit switch baffle. The multiple limit switches are connected to the transmission motor. The limit switch baffle rotates synchronously with the insulated transmission rod and triggers the limit switches to control the transmission motor.

2. The switching structure according to claim 1, characterized in that, The insulating transmission rod is pultruded from epoxy resin glass fiber composite material. A carbon steel mandrel is installed inside the insulating transmission rod. A double sealing structure consisting of a fluororubber O-ring and a polytetrafluoroethylene retaining ring is provided between the insulating transmission rod and the top plate of the insulating column.

3. The switching structure according to claim 1, characterized in that, The insulated transmission rod is a ceramic rod.

4. The switching structure according to claim 1, characterized in that, The moving cutter head includes a fixed crossbar and a conductive component. One end of the fixed crossbar is fixedly mounted on the insulating transmission rod by a clamping component, and the other end is equipped with a conductive component. The conductive component has a conductive groove that is electrically connected to the stationary cutter head of the gear position.

5. The switching structure according to claim 1, characterized in that, The limit switch includes Hall sensors corresponding to the positions of multiple stationary blades, and magnets are mounted on the limit switch baffle to cooperate with the Hall sensors.

6. The switching structure according to claim 1, characterized in that, The drive motor is a stepper motor, which is connected to the insulated drive rod through a gear set.

7. The switching structure according to claim 4, characterized in that, The insulating column consists of a cylindrical shell and upper and lower end caps. The upper and lower end caps are inserted into the upper and lower ends of the cylindrical shell and fastened with bolts. The lower end cover is equipped with a bearing that is rotatably connected to the bottom of the insulated transmission rod.

8. The switching structure according to claim 7, characterized in that, A conductive turntable, electrically connected to conductive components, is fixed at the bottom of the insulated transmission rod. The high-voltage output connection point is connected through the lower end cover, and the high-voltage output connection point has a conductive column inside the insulating column that is electrically connected to the conductive turntable.

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