Automatic maintenance on-load tap-changer

Abstract

The utility model discloses an automatic maintenance on-load tap-changer, which relates to the field of high-voltage equipment control technology, and comprises a change-over switch, the change-over switch comprises a moving contact and a potential contact group, and the automatic maintenance on-load tap-changer is characterized in that the change-over switch further comprises an equipotential contact group; the potential contact group comprises a plurality of static contacts with different potentials; the equipotential contact group comprises a plurality of equipotential contacts, the equipotential contacts are in one-to-one correspondence with the static contacts, and the corresponding equipotential contacts and static contacts have the same potential; the moving contacts are sequentially overlapped on different static contacts and equipotential contacts along with the switching action of the on-load tap-changer, the static contacts and the equipotential contacts are arranged alternately, and the corresponding equipotential contacts are adjacent to the static contacts. When the on-load tap-changer is in a non-working state for a long time, an instruction is sent out to make the on-load tap-changer act like an equipotential gear, at the moment, the action of the on-load tap-changer does not cause the change of the voltage of the transformer, meanwhile, the purpose of regular action of the on-load tap-changer can be achieved, and the on-load tap-changer is a maintenance measure for the on-load tap-changer.

Description

Technical Field

[0001] This application relates to the field of high-voltage equipment control technology, and in particular to on-load tap changers with automatic maintenance. Background Technology

[0002] An on-load tap changer is a voltage regulating device suitable for operation under transformer excitation or load, used to change the tap connection position of the transformer windings. Its basic principle is to switch between taps in the transformer windings without interrupting the load current, thereby changing the number of turns in the windings, i.e., the voltage ratio of the transformer, and ultimately achieving voltage regulation.

[0003] In related technologies, on-load tap changers consist of mechanical structures that achieve electrical switching through mechanical actions. They typically undergo thousands of voltage regulation operations per year, with some cases reaching hundreds of thousands, while others may only see a few dozen. However, in special operating conditions with very few operations, the mechanical structure may remain inactive for extended periods, potentially leading to a decline in the mechanical performance of the on-load tap changer.

[0004] In response to the aforementioned technologies, the applicant has designed an on-load tap changer with automatic maintenance. Utility Model Content

[0005] To extend the lifespan of the switch, this application provides an on-load tap changer with automatic maintenance. When the on-load tap changer is in a state of long-term inactivity (without needing voltage regulation or switching), a command is issued to make the switch operate like an equipotential tap. At this time, the operation of the switch will not cause changes in the voltage of the transformer, and at the same time, it can achieve the purpose of periodic operation of the switch, which is a maintenance measure for the switch itself.

[0006] The on-load tap changer with automatic maintenance provided in this application adopts the following technical solution:

[0007] An on-load tap changer with automatic maintenance includes a switching switch, which includes a moving contact and a group of potential contacts, and the switching switch also includes a group of equipotential contacts;

[0008] Potential contact group, which includes multiple stationary contacts with different potentials;

[0009] An equipotential contact group includes multiple equipotential contacts, each of which corresponds to a stationary contact, and the corresponding equipotential contacts and stationary contacts have the same potential.

[0010] The moving contact is sequentially connected to different stationary contacts and equipotential contacts as the on-load tap changer switches. The stationary contacts and equipotential contacts are arranged alternately, and the corresponding equipotential contacts are adjacent to the stationary contacts.

[0011] By adopting the above technical solution and setting an equipotential setting, when the switch is in a long-term inactive state, a command is issued to cause the moving contact to move towards the equipotential setting (reciprocating action). At this time, the switch's action will not cause a change in the transformer voltage, and it achieves the purpose of periodic switch operation, serving as a maintenance measure for the switch itself and effectively extending its lifespan. The equipotential contacts and stationary contacts are arranged adjacent to each other, so that during the potential switching process of the moving contact, the reciprocating action allows switching between the equipotential contacts and stationary contacts.

[0012] Optionally, the switch also includes a cylindrical switch housing and a main shaft. The switch housing is a cylindrical tube, and the main shaft is rotatably mounted inside the switch housing. The moving contact is fixed on the main shaft, and the stationary contact and the equipotential contact are arranged sequentially along the circumference of the switch housing.

[0013] By adopting the above technical solution, the moving contact moves in a circular motion with the main shaft, thereby connecting with different stationary contacts and equipotential contacts.

[0014] Optionally, the axial positions of the potential contact group and the equipotential contact group are different, and the upper and lower sides of the moving contact can respectively contact and communicate with the stationary contact and the equipotential contact.

[0015] By adopting the above technical solution and optimizing the layout within the tap changer, the circumferential positions of the potential contact group and the equipotential contact group are staggered, which reduces structural density, facilitates installation, and reduces installation risks. The upper and lower sides of the moving contact are in contact with the stationary contact and the equipotential contact, respectively. Compared to continuously switching between the stationary contact and the equipotential contact at the same position of the moving contact, the wear of the moving contact can be reduced.

[0016] Optionally, it also includes a tap selector, which includes an upper contact plane layer and a lower contact plane layer. The upper contact plane layer is provided with multiple tap contacts corresponding to the stationary contact, and the lower contact plane layer is provided with multiple tap contacts corresponding to the equipotential contact.

[0017] By adopting the above technical solution, the circuit connection layout of the tap selector is adjusted for the new switching method.

[0018] Optionally, the tap selector further includes a polarity selector connected to the tap contact on the lower contact plane.

[0019] Optionally, the potential contact group is provided with nine stationary contacts, and the equipotential contact group is provided with nine equipotential contacts.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] 1. This application discloses an automatic maintenance on-load tap changer. By setting an equipotential position within the switch, when the switch is in a long-term inactive state, a command is issued to cause the moving contact to move towards the equipotential position (reciprocating action). At this time, the switch action does not cause a change in transformer voltage, while simultaneously achieving the purpose of periodic switch operation. This serves as a maintenance measure for the switch itself and can effectively extend its lifespan. The equipotential contacts and stationary contacts are arranged adjacent to each other, so that during the potential switching process of the moving contact, the reciprocating action allows switching between the equipotential contacts and stationary contacts.

[0022] 2. By setting the potential contact group and the equipotential contact group in different axial positions, the layout inside the tap changer is optimized. The circumferential positions of the potential contact group and the equipotential contact group are staggered, which can reduce the structural density, facilitate installation, and reduce installation risks. The upper and lower sides of the moving contact are in contact with the stationary contact and the equipotential contact respectively. Compared with the continuous switching of the stationary contact and the equipotential contact in the same position of the moving contact, the wear of the moving contact can be reduced. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the equipotential switching principle in the embodiments of this application;

[0025] Figure 3 This is a schematic diagram of the contact distribution in the embodiments of this application. Figure 1 ;

[0026] Figure 4 This is a schematic diagram of the contact distribution in the embodiments of this application. Figure 2 ;

[0027] Figure 5 This is a wiring diagram of the tap selector in an embodiment of this application.

[0028] Attached reference numerals: 2. Changeover switch; 3. Tap selector; 4. Switch housing; 5. Main shaft; 6. Moving contact; 7. Potential contact group; 8. Equipotential contact group. Detailed Implementation

[0029] The following is combined with Figure 1-5 This application is described in further detail.

[0030] This application discloses an on-load tap changer with automatic maintenance, referring to... Figure 1 This includes the changeover switch 2 and the tap selector 3.

[0031] refer to Figure 2 and Figure 3The switching switch 2 includes a cylindrical switch housing 4, a main shaft 5 rotatably mounted inside the switch housing 4, a moving contact 6 fixed on the main shaft 5, and a potential contact group 7 and an equipotential contact group 8 fixed on the switch housing 4. The switch housing 4 is a cylindrical tube, and the main shaft 5 is coaxially arranged inside the switch housing 4. A bearing is provided between the main shaft 5 and the switch housing 4 to achieve a rotatable connection.

[0032] The potential contact group 7 includes multiple stationary contacts with different potentials. In this embodiment, nine stationary contacts are provided, and the nine stationary contacts are K, 2a, 3a, 4a, 5a, 6a, 7a, 8a, and 9a in sequence.

[0033] The equipotential contact group 8 includes multiple equipotential contacts, and nine equipotential contacts are also provided, each corresponding to a stationary contact. The corresponding equipotential contacts and stationary contacts have the same potential. The nine equipotential contacts are numbered 1, 2b, 3b, 4b, 5b, 6b, 7b, 8b, and 9b in sequence.

[0034] refer to Figure 3 and Figure 4 In the circumferential direction of the switch housing 4, stationary contacts and equipotential contacts are arranged sequentially at equal intervals along the circumference of the switch housing 4; stationary contacts and equipotential contacts are arranged alternately, with corresponding equipotential contacts adjacent to stationary contacts. Moving contacts 6 sequentially connect to different stationary contacts and equipotential contacts during the on-load tap changer switching action. The axial positions of the potential contact group 7 and the equipotential contact group 8 are different, and the moving contacts 6 are arranged in parallel, upper and lower groups, corresponding to the axial positions of the potential contact group 7 and the equipotential contact group 8. The upper and lower moving contacts 6 can respectively contact and communicate with the stationary contacts and the equipotential contacts.

[0035] refer to Figure 5 Tap selector 3 includes an upper contact plane layer and a lower contact plane layer. Multiple tap contacts are arranged on the upper contact plane layer corresponding to the stationary contacts, and multiple tap contacts are arranged on the lower contact plane layer corresponding to the equipotential contacts. Tap selector 3 also includes a polarity selector, which is connected to the tap contacts on the lower contact plane.

[0036] The following figure is a schematic diagram of the switching timing of the on-load tap changer with automatic maintenance in an embodiment of this application. After switching by the polarity selector, the switch 2 has a total of 35 positions; a total of 17 different voltage positions; among which contact K is the set position.

[0037]

[0038] The implementation principle of the automatic maintenance on-load tap changer disclosed in this application is as follows: By setting an equipotential position within the switch 2, the equipotential contacts and stationary contacts are arranged adjacent to each other. When the switch is in a long-term inactive state, a command is issued to cause the moving contact 6 to move towards the equipotential position (reciprocating action). At this time, the action of the switch will not cause a change in the transformer voltage, and at the same time, it can achieve the purpose of periodic operation of the switch, which is a maintenance measure for the switch itself and can effectively extend the life of the switch. By setting the potential contact group 7 and the equipotential contact group 8 at different axial positions of the switch housing 4, the layout inside the tap changer is optimized. The circumferential positions of the potential contact group 7 and the equipotential contact group 8 are staggered, which can reduce the structural density, facilitate installation, and reduce installation risks. The upper and lower sides of the moving contact 6 are in contact with the stationary contact and the equipotential contact, respectively. Compared with the continuous switching of the stationary contact and the equipotential contact at the same position of the moving contact 6, the wear of the moving contact 6 can be reduced.

[0039] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An automatically maintained on-load tap changer, comprising a switching switch (2), the switching switch (2) comprising a moving contact (6) and a group of potential contacts (7), characterized in that, The switching switch (2) also includes an equipotential contact group (8); Potential contact group (7) includes multiple stationary contacts with different potentials; The equipotential contact group (8) includes multiple equipotential contacts, each of which corresponds to a stationary contact, and the corresponding equipotential contacts and stationary contacts have the same potential. The moving contact (6) is connected to different stationary contacts and equipotential contacts in sequence as the on-load tap changer switches. The stationary contacts and equipotential contacts are arranged alternately, and the corresponding equipotential contacts are adjacent to the stationary contacts.

2. The on-load tap changer with automatic maintenance according to claim 1, characterized in that: The switching switch (2) also includes a cylindrical switch housing (4) and a main shaft (5). The switch housing (4) is a cylindrical tube, and the main shaft (5) is rotatably installed inside the switch housing (4). The moving contact (6) is fixed on the main shaft (5), and the stationary contact and the equipotential contact are arranged sequentially along the circumference of the switch housing (4).

3. The on-load tap changer with automatic maintenance according to claim 2, characterized in that: The potential contact group (7) and the equipotential contact group (8) have different axial positions, and the upper and lower sides of the moving contact (6) can respectively contact and communicate with the stationary contact and the equipotential contact.

4. The on-load tap changer with automatic maintenance according to claim 2, characterized in that: It also includes a tap selector (3), which includes an upper contact plane layer and a lower contact plane layer. Multiple taps are provided on the upper contact plane layer corresponding to the stationary contact, and multiple taps are provided on the lower contact plane layer corresponding to the equipotential contact.

5. The on-load tap changer with automatic maintenance according to claim 4, characterized in that: The tap selector (3) also includes a polarity selector connected to the tap contact on the lower contact plane.

6. The on-load tap changer with automatic maintenance according to claim 2, characterized in that: The potential contact group (7) is provided with nine stationary contacts, and the equipotential contact group (8) is provided with nine equipotential contacts.

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