Manual dry-type off-circuit tap switch

Abstract

The utility model discloses a manual dry type off-circuit tap-changer, and relates to the technical field of off-circuit tap-changers. The hand-operated dry-type off-circuit tap-changer comprises a support, two ends of the support are provided with support frames, a slide rail is arranged between the two support frames, and the support is provided with a plurality of static contacts along the track of the slide rail; the moving contact is movably arranged on the sliding rail through a driving assembly; and one end of the connecting sheet is arranged on the static contact, and the other end of the connecting sheet is connected with a transformer. According to the utility model, when the moving contact moves along the slide rail, the moving contact piece of the moving contact is contacted with different static contacts, so that the gear shifting of the dry-type off-circuit tap-changer is realized, and the gear shifting does not need to be disassembled and assembled again; meanwhile, the problem that the thread of the wiring terminal of the transformer slips due to the fact that the screwing force of the bolt is difficult to control and the number of times of voltage regulation is large is solved, and therefore the manual dry-type off-circuit tap-changer reduces the time cost spent on gear shifting of the dry-type off-circuit tap-changer.

Description

Technical Field

[0001] This invention relates to the field of de-energized tap changer technology, and particularly to a manual dry-type de-energized tap changer. Background Technology

[0002] A no-excitation tap changer is a type of switch suitable for three-phase oil-immersed transformers with a rated voltage of 10KV and a rated current of 63A or 125A or less. Under no-excitation conditions, it adjusts the secondary voltage by changing the number of turns in the primary coil of the transformer.

[0003] When adjusting the tap changer in existing dry-type non-excited tap changers, most do not have a separate voltage regulating switch. Therefore, it is necessary to adjust the connecting plates of the transformer terminals after a power outage to complete the tap change. Specifically, the operator needs to use a wrench to first remove the original connecting plates and then reposition them. However, it is often difficult to control the tightening force of the bolts. If the voltage adjustment is repeated too many times, it can cause the threads of the transformer terminals to strip, rendering the upper and lower taps unusable and requiring maintenance. The disassembly, installation, and maintenance of the tap changer all consume a significant amount of time. Summary of the Invention

[0004] In view of the deficiencies in the existing technology, the technical problem solved by the present invention is: how to reduce the time cost of adjusting the tap changer of a dry-type non-excitation tap changer.

[0005] To achieve the above objectives, the present invention provides a manual dry-type off-grid tap changer, comprising:

[0006] The bracket has support frames at both ends, and a slide rail is provided between the two support frames. Multiple stationary contacts are provided on the bracket along the track of the slide rail.

[0007] The moving contact is movably mounted on the slide rail by a drive component so that the moving contact piece of the moving contact can contact different stationary contacts;

[0008] The connecting piece has one end mounted on the stationary contact and the other end used to connect to the transformer.

[0009] By adopting the above technical solution, the moving contact piece of the moving contact contacts different stationary contacts during the movement of the moving contact along the slide rail, so as to realize the adjustment of the dry-type non-excitation tap changer, and the adjustment does not require disassembly and reinstallation; at the same time, it avoids the problem of stripping of the transformer terminal threads due to difficulty in controlling the tightening force of the bolts if the voltage adjustment is too many times. Therefore, this manual dry-type non-excitation tap changer reduces the time cost spent on adjusting the dry-type non-excitation tap changer.

[0010] In one embodiment, the stationary contact is fixed to the bracket by a bolt assembly, a flat washer is provided between the nut of the bolt assembly and the bracket, a connecting piece is provided between the flat washer and the bracket, and a skirt is provided between two adjacent stationary contacts, and the skirt is fixed to the bracket.

[0011] By adopting the above technical solution, a flat washer is provided between the nut and the bracket of the bolt assembly, which can effectively disperse the pressure of the bolt and avoid thread stripping caused by pressure concentration during long-term use, thus extending the service life. At the same time, the connecting piece is set between the flat washer and the bracket, ensuring good electrical connection performance and improving the reliability of the overall device. The umbrella skirt increases the creepage distance between each connecting piece, thereby increasing electrical insulation.

[0012] In one embodiment, the moving contact includes a moving contact element, a connecting element, and a gear position indicator element. The moving contact element and the gear position indicator element are fixedly connected by the connecting element, and the connecting element has a sliding opening to allow the connecting element to be moved and positioned on the slide rail.

[0013] By adopting the above technical solution, the moving contact can move along the slide rail without deviating from the trajectory.

[0014] In one embodiment, the moving contact includes two moving contact pieces and a fixing member, the fixing member being disposed between the two moving contact pieces, and the inner surface of the moving contact pieces contacting the stationary contact.

[0015] By adopting the above technical solution, this design enables the moving contact to maintain a stable contact state under the action of the fixing component, ensuring that the moving contact can reliably conduct the circuit during the switching process between different gears, improving the stability and reliability of gear adjustment operation, and reducing the failure rate caused by poor contact.

[0016] In one embodiment, the fixing member includes a pin, a spring, a spacer, and a retaining ring. The pin passes through two movable contact pieces, the spacer is sleeved on the pin and located between the two movable contact pieces, and a spring is sleeved on the outside of one of the movable contact pieces. One end of the spring abuts against the pin head of the pin, and the other end of the spring abuts against the outside of the movable contact piece. A retaining ring is fixedly installed on the outside of the other movable contact piece to ensure that the two movable contact pieces are always in close proximity.

[0017] By adopting the above technical solution, the pin shaft passes through the two moving contact pieces and works with the spacer to ensure the relative position stability between the moving contact pieces. The spring action enables the moving contact pieces to always maintain a force close to each other, thereby ensuring good contact between the moving contact pieces and the stationary contact. The retaining ring prevents the moving contact pieces from moving excessively under the action of external force, further improving the reliability and stability of the moving contact.

[0018] In one embodiment, the drive assembly includes a drive handle and a drive plate. The drive handle is disposed on the gear position indicator. One end of the drive handle is fixedly connected to the drive plate, and the drive plate is located between two movable contact pieces. Drive columns are respectively provided on both sides of the drive plate, and the drive columns are disposed on the drive plate to realize that the drive columns drive the movable contact pieces to move.

[0019] By adopting the above technical solution, the design of the drive handle is convenient for the operator to adjust manually. At the same time, the cooperation between the drive plate and the drive column ensures that the moving contact piece can move smoothly on the slide rail, avoiding the inconvenience and safety hazards caused by frequent disassembly and assembly of connecting pieces in the traditional method.

[0020] In one embodiment, the drive handle is made of an insulating material.

[0021] By adopting the above technical solutions, accidents caused by misoperation can be avoided. For example, if the transformer is de-energized and the discharge operation is not performed, but the gear shifting operation is performed directly, the residual charge of the transformer may cause harm to the human body if the handle is made of conductive material.

[0022] In one embodiment, a gear position display frame is provided between the two support frames, and multiple gear positions are marked on the gear position display frame along the track of the slide rail so that the gear position indicator points to different gear positions.

[0023] By adopting the above technical solution, it is easy to observe the current position of the switch.

[0024] In one embodiment, a positioning frame is provided between the two support frames, and a temporary positioning element is provided between the positioning frame and the gear position indicator.

[0025] By adopting the above technical solution, this design can ensure the precise movement and stable positioning of the moving contact on the slide rail.

[0026] In one embodiment, the temporary positioning component includes positioning holes and positioning balls. Multiple positioning holes are formed on the positioning frame along the trajectory of the slide rail. The positioning balls are embedded inside the gear position indicator, and part of the positioning balls are located outside the gear position indicator, so as to achieve the engagement of the positioning balls with the positioning holes.

[0027] By adopting the above technical solution, the design of the positioning hole and positioning ball ensures that the moving contact can quickly and stably stop at the designated gear position each time the gear is adjusted, thus improving the speed and accuracy of the gear adjustment operation.

[0028] In summary, the present invention has at least one of the following beneficial technical effects:

[0029] 1. As the moving contact moves along the slide rail, its moving contact piece contacts different stationary contacts to achieve the adjustment of the dry-type non-excitation tap changer, and this adjustment does not require disassembly and reinstallation; at the same time, it avoids the problem of stripping the threads of the transformer terminals due to difficulty in controlling the tightening force of the bolts if the voltage adjustment is repeated too many times. Therefore, this manual dry-type non-excitation tap changer reduces the time cost spent on adjusting the dry-type non-excitation tap changer.

[0030] 2. Through the specific design of the moving contact, the moving contact piece can maintain a stable contact state under the action of the fixed part, ensuring that the moving contact can reliably conduct the circuit during the switching process between different gears, improving the stability and reliability of the gear adjustment operation, and reducing the failure rate caused by poor contact.

[0031] 3. Through the specific design of the temporary positioning component, it is ensured that the moving contact can quickly and stably stop at the designated gear position each time the gear is adjusted, thereby improving the speed and accuracy of the gear adjustment operation. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of a manual dry-type non-excitation tap changer according to an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of the moving contact in an embodiment of the present invention;

[0034] Figure 3 for Figure 2 Side view;

[0035] Figure 4 This is a schematic diagram of the structure of the bracket according to an embodiment of the present invention.

[0036] In the diagram: 1-Bracket, 2-Support frame, 3-Static contact, 31-Nut, 32-Flat washer, 4-Moving contact, 41-Gear indicator, 42-Sliding port, 43-Connector, 44-Spring, 45-Spacer, 46-Moving contact piece, 47-Retaining ring, 48-Pin, 49-Positioning ball, 5-Drive handle, 51-Drive column, 6-Slide rail, 7-Connecting piece, 8-Flat skirt, 9-Positioning frame, 10-Positioning hole, 11-Gear display frame. Detailed Implementation

[0037] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0038] The manual dry-type off-magnetic tap changer in this embodiment of the invention is described in [reference needed]. Figure 1As shown, the manual dry-type non-excitation tap changer includes a bracket 1, with support frames 2 at both ends, and a slide rail 6 between the two support frames 2. Multiple stationary contacts 3 are arranged on the bracket 1 along the track of the slide rail 6; a moving contact 4, which is movably arranged on the slide rail 6 by a drive assembly, so that the moving contact piece 46 of the moving contact 4 can contact different stationary contacts 3; and a connecting piece 7, one end of which is arranged on the stationary contact 3, and the other end of which is used to connect to the transformer.

[0039] Therefore, it can be seen that during the movement of the moving contact 4 along the slide rail 6, the moving contact piece 46 of the moving contact 4 contacts different stationary contacts 3 to realize the adjustment of the dry-type non-excitation tap changer, and this adjustment does not require disassembly and reinstallation; at the same time, it avoids the problem of stripping of the threads of the transformer terminal due to difficulty in controlling the tightening force of the bolts if the voltage adjustment is too many times. Therefore, this manual dry-type non-excitation tap changer reduces the time cost spent on adjusting the dry-type non-excitation tap changer.

[0040] Example 1

[0041] The moving contact 4 provided in this embodiment is one of the key components; see [link to relevant documentation]. Figure 2 , 3 The device comprises a movable contact, a connecting member 43, and a gear position indicator 41. The movable contact and the gear position indicator 41 are fixedly connected by the connecting member 43, which has a sliding opening 42, allowing it to move freely along the slide rail 6. The movable contact mainly includes two movable contact pieces 46 and a fixing member. The inner surface of the movable contact piece 46 contacts the stationary contact 3, forming an electrical connection. The fixing member maintains the relative position between the two movable contact pieces 46 and provides the necessary pressure to ensure tight contact. The fixing member can include various structural forms such as a pin 48, a spring 44, a spacer 45, and a retaining ring 47. The pin 48 passes through the two movable contact pieces 46, and the spacer 45 is fitted onto the pin 48, located between the two movable contact pieces 46, serving as an isolation element. A spring 44 is fitted onto the outer side of one of the movable contact pieces 46, with one end of the spring 44 abutting against the pin head of the pin 48 and the other end abutting against the outer side of the movable contact piece 46, thereby keeping the two movable contact pieces 46 close to each other at all times. A retaining ring 47 is fixedly installed on the outer side of the other movable contact piece 46 to prevent the pin 48 from falling off.

[0042] The drive component is responsible for moving the moving contact 4. See also Figure 1As shown, the drive assembly includes a drive handle 5 and a drive plate. The drive handle 5 is mounted on the gear indicator 41, and one end is fixedly connected to the drive plate. The drive plate is located between two moving contact pieces 46, and drive posts 51 are respectively provided on both sides. The drive posts 51 are mounted on the drive plate and drive the moving contact pieces 46 to move. To improve safety, the drive handle 5 is made of insulating material, such as plastic or composite material, to prevent electric shock accidents to operators.

[0043] One end of the connecting piece 7 is mounted on the stationary contact 3, and the other end is used for connection to the transformer. See also Figure 1 , 4 As shown, the stationary contact 3 is fixed to the bracket 1 by a bolt assembly. A flat washer 32 is provided between the nut 31 of the bolt assembly and the bracket 1, and a connecting piece 7 is provided between the flat washer 32 and the bracket 1. This design not only reduces damage to the threads during disassembly and assembly but also improves the stability of the connection.

[0044] See Figure 1 As shown, a gear position display frame 11 is also provided between the two support frames 2. Multiple gear positions are marked on the gear position display frame 11 along the track of the slide rail 6 so that the gear position indicator 41 can point to different gear positions. This allows the current gear position to be displayed intuitively, making it convenient for the operator to confirm the gear adjustment result.

[0045] See Figure 1 , 3 As shown, a positioning frame 9 is also provided between the two support frames 2, and a temporary positioning element is provided between the positioning frame 9 and the gear position indicator 41. The temporary positioning element includes positioning holes 10 and positioning balls 49. Multiple positioning holes 10 are formed on the positioning frame 9 along the trajectory of the slide rail 6, and the positioning balls 49 are embedded inside the gear position indicator 41, with a portion of the positioning balls 49 located outside the gear position indicator 41, so as to achieve engagement between the positioning balls 49 and the positioning holes 10. This method can ensure the accurate positioning of the moving contact 4 in each gear position and improve the accuracy of gear adjustment.

[0046] The implementation principle of this embodiment is as follows:

[0047] By introducing a movable moving contact 4 and a dedicated drive assembly, fast and accurate gear shifting is achieved. Traditional manual gear shifting requires disassembling and re-fixing the connecting piece 7, which is time-consuming and prone to damaging the equipment. In this embodiment, gear shifting can be easily achieved by simply rotating the drive handle 5, greatly shortening the shifting time and reducing maintenance costs. At the same time, through reasonable design, the contact between the moving contact 4 and the stationary contact 3 is more stable, reducing wear caused by frequent operation and extending the service life of the equipment.

[0048] Example 2

[0049] The difference between this embodiment and the above embodiment is that a shock-absorbing device is added between the bracket 1 and the support frame 2 to absorb the vibration generated during operation, thereby further improving the stability and reliability of the equipment.

[0050] Specifically, the vibration damping device can take the form of a rubber damper or a spring-loaded 44 damper. The rubber damper is installed between the bracket 1 and the support frame 2, utilizing the elasticity and damping properties of rubber to effectively absorb and disperse the impact force generated during operation. The spring-loaded 44 damper achieves the same damping effect through the extension and retraction of the spring 44. Both of these vibration damping devices can significantly reduce the vibration amplitude of the equipment during use, improving operational smoothness and comfort.

[0051] Furthermore, vibration damping devices effectively protect internal electrical components from external environmental influences, which is especially important for transformers that frequently operate under harsh conditions. The presence of vibration damping devices not only improves the durability of the equipment but also enhances the user experience.

[0052] The implementation principle of this embodiment is as follows:

[0053] By adding a vibration damping device between bracket 1 and support frame 2, vibrations generated during operation can be significantly reduced, improving the stability and reliability of the equipment. This not only helps extend the service life of the equipment but also enhances the user's operating experience. The selection of the vibration damping device can be flexibly adjusted according to the actual application environment; for example, a rubber damper is suitable for light-load applications, while a spring-loaded 44 damper is more suitable for heavy-load applications. In summary, this improvement enables the manual dry-type non-excited tap changer to perform excellently in various complex environments, greatly enhancing its practical value.

[0054] Example 3

[0055] The difference between this embodiment and the above embodiment is that a temperature sensor is added between the moving contact 4 and the stationary contact 3 to monitor the temperature of the contact point in real time, so as to detect potential faults in a timely manner and take corresponding measures.

[0056] Specifically, the temperature sensor can take the form of a resistance temperature detector (RTD) or an infrared thermometer. An RTD is a common temperature measuring element with high accuracy and stability, suitable for continuously monitoring temperature changes at contact points. An infrared thermometer, on the other hand, requires no physical contact and can accurately measure temperature within a certain distance, making it particularly suitable for high-temperature environments. The temperature sensor is installed near the contact area between the moving contact 4 and the stationary contact 3, and transmits the temperature signal to the controller via a data acquisition module for real-time monitoring.

[0057] Furthermore, temperature sensor data can be transmitted to a remote terminal via a wireless communication module, allowing maintenance personnel to monitor equipment status at any time. If an abnormal temperature increase is detected, the system will automatically issue an alarm, alerting the user to inspect the equipment and prevent potential risks.

[0058] The implementation principle of this embodiment is as follows:

[0059] By adding a temperature sensor between the moving contact 4 and the stationary contact 3, temperature changes at the contact point can be monitored in real time, allowing for early detection of potential faults. This is crucial for ensuring the safe operation of the equipment. Traditional manual inspection methods struggle to achieve real-time monitoring and are prone to missing fault information. This embodiment, however, utilizes automation to achieve continuous, 24 / 7 temperature monitoring, significantly improving the reliability and safety of the equipment. Furthermore, the temperature sensor data helps maintenance personnel better understand the equipment's operating status, develop appropriate maintenance plans, and extend the equipment's lifespan.

[0060] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A manual dry-type non-excitation tap changer, characterized in that, It includes: The bracket (1) has support frames (2) at both ends, and a slide rail (6) is provided between the two support frames (2). Multiple stationary contacts (3) are provided on the bracket (1) along the trajectory of the slide rail (6). The moving contact (4) is movably mounted on the slide rail (6) by a drive assembly so that the moving contact piece (46) of the moving contact (4) can contact different stationary contacts (3); The connecting piece (7) has one end set on the stationary contact (3) and the other end used to connect to the transformer.

2. The manual dry-type off-magnetic tap changer as described in claim 1, characterized in that: The stationary contact (3) is fixed to the bracket (1) by a bolt assembly. A flat washer (32) is provided between the nut (31) of the bolt assembly and the bracket (1). A connecting piece (7) is provided between the flat washer (32) and the bracket (1). A skirt (8) is provided between two adjacent stationary contacts (3), and the skirt (8) is fixed to the bracket (1).

3. The manual dry-type non-excitation tap changer as described in claim 1, characterized in that: The moving contact (4) includes a moving contact, a connecting member (43) and a gear indicator (41). The moving contact and the gear indicator (41) are fixedly connected by the connecting member (43). The connecting member (43) has a sliding opening (42) so that the connecting member (43) can be moved and set on the slide rail (6).

4. The manual dry-type non-excitation tap changer as described in claim 3, characterized in that: The moving contact includes two moving contact pieces (46) and a fixing member. The fixing member is disposed between the two moving contact pieces (46), and the inner side of the moving contact piece (46) is in contact with the stationary contact (3).

5. The manual dry-type non-excitation tap changer as described in claim 4, characterized in that: The fixing components include a pin (48), a spring (44), a spacer (45), and a retaining ring (47). The pin (48) passes through two movable contact pieces (46), and the spacer (45) is sleeved on the pin (48) and located between the two movable contact pieces (46). The pin (48) is sleeved on the outside of one of the movable contact pieces (46), and one end of the spring (44) abuts against the pin head of the pin (48), and the other end of the spring (44) abuts against the outside of the movable contact piece (46). The pin (48) is fixedly provided with a retaining ring (47) on the outside of the other movable contact piece (46) so that the two movable contact pieces (46) always have a force that brings them closer to each other.

6. The manual dry-type off-magnetic tap changer as described in claim 4, characterized in that: The drive assembly includes a drive handle (5) and a drive plate. The drive handle (5) is mounted on the gear indicator (41). One end of the drive handle (5) is fixedly connected to the drive plate, and the drive plate is located between two movable contact pieces (46). Drive columns (51) are respectively provided on both sides of the drive plate, and the drive columns (51) are mounted on the drive plate to enable the drive columns (51) to drive the movable contact pieces (46) to move.

7. The manual dry-type off-magnetic tap changer as described in claim 6, characterized in that: The drive handle (5) is made of insulating material.

8. The manual dry-type non-excitation tap changer as described in claim 3, characterized in that: A gear position display frame (11) is provided between the two support frames (2). Multiple gear positions are marked on the track of the slide rail (6) on the gear position display frame (11) so that the gear position indicator (41) points to different gear positions.

9. The manual dry-type off-magnetic tap changer as described in claim 3, characterized in that: A positioning frame (9) is provided between the two support frames (2), and a temporary positioning element is provided between the positioning frame (9) and the gear indicator (41).

10. The manual dry-type off-magnetic tap changer as described in claim 9, characterized in that: The temporary positioning component includes positioning holes (10) and positioning balls (49). Multiple positioning holes (10) are opened on the positioning frame (9) along the trajectory of the slide rail (6). The positioning balls (49) are embedded inside the gear position indicator (41), and part of the positioning balls (49) are located outside the gear position indicator (41) to achieve the engagement of the positioning balls (49) with the positioning holes (10).

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