On-load capacity-adjustable transition device for dry-type transformer and capacity-adjustable transformer

Abstract

The present invention discloses a on-load capacity-adjusting transition device for a dry-type transformer and a capacity-adjusting transformer, which relates to the technical field of transformer capacity adjustment, and solves the technical problems that the capacity-adjusting transformer cannot provide power supply continuity during the voltage regulation process and is not applicable to places with high requirements for power supply reliability. The on-load capacity-adjusting transition device for the dry-type transformer includes a high-voltage side switch, a low-voltage side switch, a transition transformer, and a power mechanism; the high-voltage side switch is connected to the high-voltage winding of the transition transformer; the low-voltage side switch is connected to the low-voltage winding of the transition transformer; the power mechanism is connected to the high-voltage side switch and the low-voltage side switch. The capacity-adjusting transformer includes the above-mentioned on-load capacity-adjusting transition device for the dry-type transformer. The capacity-adjusting transformer with the on-load capacity-adjusting transition device provided by the present invention has high power supply continuity, can be applicable to places with high requirements for power supply continuity, and has fewer vacuum bubbles and lower costs.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer capacity regulation, and in particular to a no-load capacity regulation transition device for dry-type transformers and a capacity regulation transformer. Background Art

[0002] During the peak period of power consumption in the power grid, the demand for electricity is large, and only large-capacity transformers can meet the power consumption requirements. However, during the low period of power consumption in the power grid, the demand for electricity is small, and the no-load loss of large-capacity transformers wastes a large amount of electric energy and also reduces the power factor. In the existing power supply system, capacity regulation transformers are installed. The capacity regulation transformer can judge the magnitude of the current load according to the voltage and current on the low-voltage side, and can adjust its own capacity according to the load size of the power grid to improve the load factor of the capacity regulation transformer.

[0003] A capacity regulation switch is provided on the capacity regulation transformer. Among them, the on-load capacity regulation switch changes the connection mode of the high-voltage winding and the low-voltage winding in the capacity regulation transformer, and then changes the capacity of the capacity regulation transformer to meet different power consumption requirements. The capacity regulation switch usually has a high-voltage side switch and a low-voltage side switch. When the capacity regulation switch performs capacity regulation, the contacts that need to be closed for the high- and low-voltage side switches are closed, and the closed contacts are opened. However, when the contacts that need to be closed are not closed and the closed contacts have been opened, there is a short-time power outage, which is not applicable to places with high requirements for power supply reliability. Summary of the Invention

[0004] The present invention provides a no-load capacity regulation transition device for dry-type transformers and a capacity regulation transformer to solve the technical problem that the existing capacity regulation transformers cannot provide power supply continuity during the capacity regulation process and are not applicable to places with high requirements for power supply reliability.

[0005] In a first aspect, the present invention provides a no-load capacity regulation transition device for dry-type transformers. The no-load capacity regulation transition device for dry-type transformers includes a high-voltage side switch, a low-voltage side switch, a transition transformer, and a power mechanism;

[0006] One terminal of the high-voltage side switch is connected to the high-voltage winding of the transition transformer, and the other terminal is connected to the high-voltage winding of the capacity regulation transformer;

[0007] One terminal of the low-voltage side switch is connected to the low-voltage winding of the transition transformer, and the other terminal is used to connect to the low-voltage winding of the capacity regulation transformer;

[0008] The power mechanism is connected to the high-voltage side switch and the low-voltage side switch, and can drive the high-voltage side switch and the low-voltage side switch to be turned on or off.

[0009] As a further solution of the present invention, the high-voltage side switch includes a solid-sealed pole column and a push-pull rod;

[0010] Both ends of the push-pull rod are respectively hinged to the power mechanism and the insulating pull rod of the solid-sealed pole column, and can pull or push the insulating pull rod of the solid-sealed pole column under the drive of the power mechanism.

[0011] As a further solution of the present invention, the low-voltage side switch includes a moving contact and a static contact;

[0012] The moving contact is connected to the power mechanism and can contact or disconnect from the static contact under the drive of the power mechanism.

[0013] As a further solution of the present invention, the moving contact includes two parallel clamping plates, and both clamping plates extend along the movement direction of the power mechanism and can clamp the static contact.

[0014] As a further solution of the present invention, the power mechanism includes a driving member, a mounting plate and a transmission plate;

[0015] The driving member is mounted on the mounting plate, the moving end of the driving member is connected to the transmission plate, and both the high-voltage side switch and the low-voltage side switch are connected to the transmission plate.

[0016] As a further solution of the present invention, the driving member and the transmission plate are respectively located on both sides of the mounting plate, and a limiting long hole is provided on the mounting plate;

[0017] The power mechanism further includes a connecting member, the connecting member is located in the limiting long hole, and both ends of the connecting member are respectively connected to the moving end of the driving member and the transmission plate.

[0018] As a further solution of the present invention, the driving member includes a permanent magnet mechanism electromagnet, and the iron core of the permanent magnet mechanism electromagnet is connected to the transmission plate.

[0019] As a further solution of the present invention, the on-load capacity-adjusting transition device of the dry-type transformer includes three high-voltage side switches and three low-voltage side switches;

[0020] The three high-voltage side switches are correspondingly connected to the three-phase high-voltage windings of the transition transformer, and the three low-voltage side switches are correspondingly connected to the three-phase low-voltage windings of the transition transformer.

[0021] As a further solution of the present invention, the low-voltage side switch closes before the high-voltage side switch, and the low-voltage side switch disconnects after the high-voltage side switch.

[0022] In a second aspect, the present invention further provides a capacity-adjusting transformer, which includes the above-mentioned on-load capacity-adjusting transition device of the dry-type transformer;

[0023] The high-voltage winding of the transition transformer is connected in parallel with the high-voltage winding of the capacity-adjustable transformer through a high-voltage side switch, and the low-voltage winding of the transition transformer is connected in parallel with the low-voltage winding of the capacity-adjustable transformer through a low-voltage side switch.

[0024] The present invention provides a dry-type transformer on-load capacity-adjustable transition device, which includes a transition transformer, a high-voltage side switch, a low-voltage side switch and a power mechanism. One terminal of the high-voltage side switch is connected to the high-voltage winding of the transition transformer, and the other terminal of the high-voltage side switch is connected to the high-voltage winding of the capacity-adjustable transformer; one terminal of the low-voltage side switch is connected to the low-voltage winding of the transition transformer, and the other terminal of the low-voltage side switch is used to be connected to the low-voltage winding of the capacity-adjustable transformer; the power mechanism is connected to the high-voltage side switch and the low-voltage side switch, and the power mechanism can drive the high-voltage side switch and the low-voltage side switch to be turned on or off. When the capacity-adjustable transformer with this dry-type transformer on-load capacity-adjustable transition device performs a capacity adjustment operation, the power mechanism drives the high-voltage side switch to be turned on, so that the high-voltage winding of the transition transformer is connected in parallel with the high-voltage winding of the capacity-adjustable transformer. At the same time, the power mechanism also drives the low-voltage side switch to be connected, so that the low-voltage winding of the transition transformer is connected in parallel with the low-voltage winding of the capacity-adjustable transformer. At this time, when the capacity-adjusting switch inside the capacity-adjustable transformer is performing a capacity adjustment conversion process and a power failure occurs on the high-voltage side of the capacity-adjusting switch, the load is powered by this dry-type transformer on-load capacity-adjustable transition device, so that the load will not have an instantaneous power failure. After the capacity adjustment of the capacity-adjustable transformer is completed, the power mechanism drives the low-voltage side switch and the high-voltage side switch to be turned off. Therefore, this dry-type transformer on-load capacity-adjustable transition device enables the capacity-adjustable transformer to have high power supply continuity, so that the capacity-adjustable transformer can be applicable to places with high requirements for power supply continuity.

[0025] The present invention also provides a capacity-adjustable transformer, which includes the above-mentioned dry-type transformer on-load capacity-adjustable transition device. Among them, the high-voltage winding of the transition transformer is connected in parallel with the high-voltage winding of the capacity-adjustable transformer through a high-voltage side switch, and the low-voltage winding of the transition transformer is connected in parallel with the low-voltage winding of the capacity-adjustable transformer through a low-voltage side switch. The above-mentioned dry-type transformer on-load capacity-adjustable transition device enables this capacity-adjustable transformer to have good power supply continuity, and further enables this capacity-adjustable transformer to be applicable to places with high requirements for power supply reliability. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of the first perspective of the dry-type transformer on-load capacity-adjustable transition device provided by the embodiment of the present invention;

[0027] Figure 2 It is a schematic structural diagram of the second perspective of the dry-type transformer on-load capacity-adjustable transition device provided by the embodiment of the present invention;

[0028] Figure 3Schematic diagram of the connection structure between the high-voltage side switch and the power mechanism provided by the embodiment of the present invention;

[0029] Figure 4 Schematic diagram of the connection structure between the low-voltage side switch and the power mechanism provided by the embodiment of the present invention;

[0030] Figure 5 Schematic diagram of the structure of the low-voltage side switch provided by the embodiment of the present invention;

[0031] Figure 6 Schematic diagram of the structure of the power mechanism provided by the embodiment of the present invention;

[0032] Figure 7 Schematic diagram of the structure of the on-load tap-changing and capacity-adjusting switch of the dry-type transformer with a cabinet provided by the embodiment of the present invention;

[0033] Figure 8 Schematic diagram of the structure of the capacity-adjusting transformer provided by the embodiment of the present invention;

[0034] Figure 9 Circuit diagram of the capacity-adjusting transformer provided by the embodiment of the present invention.

[0035] Icon: 10 - switch box body; 20 - high-voltage side switch; 21 - solid-sealed pole column; 22 - push-pull rod; 30 - low-voltage side switch; 31 - static contact; 32 - moving contact; 33 - moving contact insulator; 40 - power mechanism; 41 - driving part; 42 - mounting plate; 421 - limiting long hole; 43 - transmission plate; 44 - connecting part; 50 - insulating sealing plate; 60 - cabinet; 61 - insulating side plate. Detailed implementation manners

[0036] The words indicating directions such as "up", "down", "inside", "outside", etc. are based on the drawings shown, and are only for the convenience of describing the present invention, and should not be construed as a limitation to the present invention.

[0037] Words such as "installation" and "connection" should be understood in a broad sense, which can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two components.

[0038] The present invention provides an on-load tap-changing and capacity-adjusting transition device for a dry-type transformer. Please refer to the accompanying drawings in the specification together Figures 1 to 7 .

[0039] As Figure 1 and Figure 2 shown, the on-load tap-changing and capacity-adjusting transition device for the dry-type transformer includes a transition transformer (not shown in the figure), a high-voltage side switch 20, a low-voltage side switch 30, and a power mechanism 40.

[0040] One of the terminals of the high-voltage side switch 20 is connected to the high-voltage winding of the transition transformer, and the other terminal of the high-voltage side switch 20 is connected to the high-voltage winding of the capacity-adjustable transformer. One of the terminals of the low-voltage side switch 30 is connected to the low-voltage winding of the transition transformer, and the other terminal of the low-voltage side switch 30 is used to connect to the low-voltage winding of the capacity-adjustable transformer. Refer to Figure 3 and Figure 4 , the power mechanism 40 is connected to the high-voltage side switch 20 and the low-voltage side switch 30, and can drive the high-voltage side switch 20 and the low-voltage side switch 30 to be turned on or off.

[0041] When the capacity-adjustable transformer with this on-load capacity-adjusting transition device for dry-type transformers performs a capacity-adjusting operation, the power mechanism 40 drives the high-voltage side switch 20 to be turned on, so that the high-voltage winding of the transition transformer is connected in parallel with the high-voltage winding of the capacity-adjustable transformer. The power mechanism 40 also drives the low-voltage side switch 30 to be turned on at the same time, so that the low-voltage winding of the transition transformer is connected in parallel with the low-voltage winding of the capacity-adjustable transformer. At this time, during the capacity-adjusting conversion process of the capacity-adjusting switch in the capacity-adjustable transformer, when a power failure occurs on the high-voltage side of the capacity-adjusting switch, the load is powered by this on-load capacity-adjusting transition device for dry-type transformers, so that the load will not have an instantaneous power failure. After the capacity adjustment of the capacity-adjustable transformer is completed, the power mechanism 40 drives the low-voltage side switch 30 and the high-voltage side switch 20 to be turned off. This on-load capacity-adjusting transition device for dry-type transformers enables the capacity-adjustable transformer to have a high power supply continuity, and thus enables the capacity-adjustable transformer with this on-load capacity-adjusting transition device for dry-type transformers to be applicable to places with high requirements for power supply continuity.

[0042] Figure 1 and Figure 2 It also shows that the on-load capacity-adjusting switch of this dry-type transformer further includes a switch box body 10. The power mechanism 40 is installed inside the switch box body 10, and the solid-sealed pole column 21 is installed outside the switch box body 10. The box body 10 plays a role in protecting the internal structure.

[0043] Figure 1 and Figure 3 It shows the specific structure of the high-voltage side switch 20. The high-voltage side switch 20 includes a solid-sealed pole column 21 and a push-pull rod 22. The two ends of the push-pull rod 22 are respectively hinged to the insulating pull rods of the power mechanism 40 and the solid-sealed pole column 21, and can pull or push the insulating pull rod of the solid-sealed pole column 21 under the drive of the power mechanism 40. To Figure 3For example, when the power mechanism 40 drives the upper end of the push-pull rod 22 to move leftward, the lower end of the push-pull rod 22 pulls upward the insulating rod of the solid-sealed pole column 21; when the power mechanism 40 drives the upper end of the transmission to move rightward, the lower end of the transmission pushes the insulating rod of the solid-sealed pole column 21. That is, when the power mechanism 40 drives the push-pull rod 22 to move in one direction, the solid-sealed pole column 21 is connected, and the high-voltage winding of the transition transformer is connected in parallel with the high-voltage winding of the capacitance-adjustable transformer; when the power mechanism 40 drives the push-pull rod 22 to move in the other direction, the solid-sealed pole column 21 is disconnected, and the high-voltage winding of the transition transformer is disconnected from the high-voltage winding of the capacitance-adjustable transformer.

[0044] As Figure 5 Fig. shows the specific structure of the low-voltage side switch 30. The low-voltage side switch 30 includes a moving contact 32 and a static contact 31. Among them, the moving contact 32 is connected to the power mechanism 40, and the moving contact 32 can contact or disconnect from the static contact 31 under the drive of the power mechanism 40. Among them, each low-voltage side switch 30 may include two static contacts 31 and one moving contact 32. At this time, the moving contact 32 can contact two static contacts 31 simultaneously or only contact one of the static contacts 31. Each low-voltage side switch 30 may also include three static contacts 31 and one moving contact 32. At this time, the moving contact 32 can contact the middle static contact 31 and one of the outer static contacts 31 simultaneously, and the moving contact 32 can also only contact one of the static contacts 31. Multiple low-voltage side switches 30 can be set independently of each other, or adjacent low-voltage side switches 30 may have a shared static contact 31.

[0045] Figure 5 Fig. also shows the specific structure of the moving contact 32. The moving contact 32 includes two parallel clamping plates. Both clamping plates extend along the movement direction of the power mechanism 40, and the two clamping plates can clamp the static contact 31. The two clamping plates can clamp two adjacent static contacts 31 simultaneously, or the two clamping plates only clamp one static contact 31. When the two clamping plates clamp two adjacent static contacts 31 simultaneously, the two static contacts 31 are connected through the moving contact 32; when the two clamping plates only clamp one static contact 31, the two adjacent static contacts 31 are disconnected.

[0046] Specifically, Figure 5 Fig. also shows that the low-voltage side switch 30 has a moving contact insulator 33. The lower end of the moving contact insulator 33 is connected to the transmission plate 43, and the moving contact 32 is installed on the moving contact insulator 33. In addition, multiple static contacts 31 are arranged inside the insulating sealing plate 50, and the outside of the insulating sealing plate 50 is a wiring terminal, and the wiring terminal is connected to the corresponding static contact 31.

[0047] Figure 6The specific structure of the power mechanism 40 is shown. The power mechanism 40 includes a driving member 41, a mounting plate 42, and a transmission plate 43. The driving member 41 is mounted on the mounting plate 42. The moving end of the driving member 41 is connected to the transmission plate 43, and both the high-voltage side switch 20 and the low-voltage side switch 30 are connected to the transmission plate 43. When the on-load tap-changing and capacity-transition device of the dry-type transformer works, the moving end of the driving member 41 drives the transmission plate 43 to move, and the transmission plate 43 drives the high-voltage side switch 20 and the low-voltage side switch 30 to be turned on or off.

[0048] Continuing to refer to Figure 6 , the driving member 41 and the transmission plate 43 are respectively located on both sides of the mounting plate 42, and a limiting long hole 421 is formed in the mounting plate 42. The power mechanism 40 further includes a connecting member 44. The connecting member 44 is located in the limiting long hole 421, and both ends of the connecting member 44 are respectively connected to the moving end of the driving member 41 and the transmission plate 43. The limiting long hole 421 can limit the moving distance and the extreme position of the connecting member 44, and further limit the moving distance and the extreme position of the transmission plate 43. By setting the position and length of the limiting long hole 421, the two extreme positions of the transmission plate 43 can respectively correspond to the turning on or off of the high-voltage side switch 20 and the turning on or off of the low-voltage side switch 30, ensuring that the transmission plate 43 drives the high-voltage side switch 20 and the low-voltage side switch 30 to be accurately turned on or off. Of course, the driving member 41 and the transmission plate 43 can also be located on the same side of the mounting plate 42. At this time, if the extreme position and the moving distance of the transmission plate 43 are to be limited, a baffle or a stop block can be provided on the mounting plate 42.

[0049] Specifically, Figure 6 In the shown power mechanism 40, the driving member 41 includes a permanent magnet mechanism electromagnet. When the coil of the permanent magnet mechanism electromagnet is energized, the iron core of the permanent magnet mechanism moves along its own length direction, and the moving direction of the iron core is changed by changing the current direction on the coil of the permanent magnet mechanism electromagnet. The iron core of the permanent magnet mechanism electromagnet is connected to the transmission plate 43, and the iron core drives the transmission plate 43 to move, thereby turning on or off the high-voltage side switch 20 and the low-voltage side switch 30. Of course, the driving member 41 is not limited to Figure 6 the shown permanent magnet mechanism electromagnet. The driving member 41 can also be of other structural forms. For example, the driving member 41 includes a motor, a gear, and a rack. The gear is mounted on the rotating shaft of the motor, the rack meshes with the gear, the rack is connected to the transmission plate 43, and when the motor drives the gear to rotate, the rack makes a linear motion, thereby driving the transmission plate 43 to make a linear motion.

[0050] Such as Figures 1 to 4As shown in the figure, the on-load capacity-adjustable transition device of the dry-type transformer has three high-voltage side switches 20 and three low-voltage side switches 30. Among them, the three high-voltage side switches 20 are correspondingly connected to the three-phase high-voltage windings of the transition transformer, and each high-voltage side switch 20 controls whether the high-voltage winding of one phase of the transition transformer is connected in parallel with the corresponding high-voltage winding of the capacity-adjustable transformer. Among them, the three low-voltage side switches 30 are correspondingly connected to the three-phase low-voltage windings of the transition transformer, and each low-voltage side switch 30 controls whether the low-voltage winding of one phase of the transition transformer is connected in parallel with the corresponding low-voltage winding of the capacity-adjustable transformer. Setting three high-voltage side switches 20 and three low-voltage side switches 30 can eliminate the connection wires between the phases of the on-load capacity-adjustable transition device of the dry-type transformer.

[0051] The power mechanism 40 drives the high-voltage side switch 20 and the low-voltage side switch 30 to move. When the windings of the transition transformer are connected in parallel with the windings of the capacity-adjustable transformer, the low-voltage side switch 30 closes before the high-voltage side switch 20. When the low-voltage side switch 30 closes, the high-voltage side switch 20 has not closed yet. Therefore, the low-voltage side switch 30 closes without load, and no arc will be generated during closing. The power mechanism 40 drives the high-voltage side switch 20 and the low-voltage side switch 30 to move. When the windings of the transition transformer are disconnected from the windings of the capacity-adjustable transformer, the low-voltage side switch 30 disconnects later than the high-voltage side switch 20. When the high-voltage side switch 20 disconnects, it separates the load borne when the on-load capacity-adjustable transition device of the dry-type transformer is connected in parallel, and the low-voltage side switch 30 does not need to disconnect the load when disconnecting. Therefore, the low-voltage side switch 30 will not generate an arc.

[0052] As Figure 7 , the on-load capacity-adjustable transition device of the dry-type transformer further includes a cabinet 60. The above-mentioned transition transformer, high-voltage side switch 20, low-voltage side switch 30 and power mechanism 40 are all located inside the cabinet 60, and the cabinet 60 plays a protective role for the above-mentioned transition transformer, high-voltage side switch 20, low-voltage side switch 30 and power mechanism 40. When the on-load capacity-adjustable transition device of the dry-type transformer is in use, the cabinet 60 is grounded. The cabinet 60 has an insulating side plate 61. The incoming and outgoing lines pass through the insulating side plate 61 and are connected to the high-voltage side switch 20 and the low-voltage side switch 30. The insulating side plate 61 ensures the insulation between the incoming and outgoing lines and the insulation between the incoming and outgoing lines and the ground.

[0053] The present invention also provides a capacity-adjustable transformer. Please refer to the accompanying drawings in the specification Figures 1 to 9 .

[0054] As Figure 8As shown in the figure, the on-load capacity-adjustable transformer includes the above-mentioned dry-type transformer on-load capacity-adjustable transition device. Specifically, the cabinet body 60 is arranged on the bottom channel steel of the capacity-adjustable transformer. The high-voltage winding of the transition transformer is connected in parallel with the high-voltage winding of the capacity-adjustable transformer through the high-voltage side switch 20, and the low-voltage winding of the transition transformer is connected in parallel with the low-voltage winding of the capacity-adjustable transformer through the low-voltage side switch 30. The above-mentioned dry-type transformer on-load capacity-adjustable transition device enables the capacity-adjustable transformer to have better power supply continuity, and thus enables the capacity-adjustable transformer to be applicable to places with high requirements for power supply reliability.

[0055] Figure 9 In the shown circuit diagram, the right side is the circuit structure of the dry-type transformer on-load capacity-adjustable transition device, and the left side is the circuit structure of the capacity-adjusting switch.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention. Those of ordinary skill in the art should understand that they can modify the technical solutions recorded in the above embodiments, or perform equivalent replacements on some or all of the technical features; these modifications or replacements do not depart from the scope of the technical solutions of the present invention.

Claims

1. A on-load capacity-adjusting transition device for a dry-type transformer, characterized in that, It includes a high-voltage side switch, a low-voltage side switch, a transition transformer and a power mechanism; One terminal of the high-voltage side switch is connected to the high-voltage winding of the transition transformer, and the other terminal is connected to the high-voltage winding of the capacity-adjustable transformer; One terminal of the low-voltage side switch is connected to the low-voltage winding of the transition transformer, and the other terminal is used to be connected to the low-voltage winding of the capacity-adjustable transformer; The power mechanism is connected to the high-voltage side switch and the low-voltage side switch, and can drive the high-voltage side switch and the low-voltage side switch to be turned on or off; The high-voltage side switch includes a solid-sealed pole column with a vacuum bubble inside and a push-pull rod; Both ends of the push-pull rod are respectively hinged to the power mechanism and the insulating pull rod of the solid-sealed pole column, and can pull or push the insulating pull rod of the solid-sealed pole column under the drive of the power mechanism; The low-voltage side switch includes a moving contact and a static contact; The moving contact is connected to the power mechanism, and can contact or disconnect from the static contact under the drive of the power mechanism.

2. The on-load capacity-adjustable transition device for the dry-type transformer according to claim 1, wherein The moving contact includes two parallelly arranged clamping plates, and both of the two clamping plates extend along the movement direction of the power mechanism and can clamp the static contact.

3. The on-load capacity-adjustable transition device for dry-type transformers according to claim 1, characterized in that, The power mechanism includes a driving member, a mounting plate and a transmission plate; The driving member is mounted on the mounting plate, the moving end of the driving member is connected to the transmission plate, and both the high-voltage side switch and the low-voltage side switch are connected to the transmission plate.

4. The on-load capacity-adjustable transition device for dry-type transformers according to claim 3, characterized in that, The driving member and the transmission plate are respectively located on both sides of the mounting plate, and a limiting long hole is formed on the mounting plate; The power mechanism further includes a connecting member, the connecting member is located in the limiting long hole, and both ends of the connecting member are respectively connected to the moving end of the driving member and the transmission plate.

5. The on-load capacity-adjustable transition device for dry-type transformers according to claim 3 or 4, characterized in that, The driving member includes a permanent magnet mechanism electromagnet, and the iron core of the permanent magnet mechanism electromagnet is connected to the transmission plate.

6. The on-load capacity-adjustable transition device for dry-type transformers according to claim 1, characterized in that, The on-load capacity-adjustable transition device of the dry-type transformer includes three high-voltage side switches and three low-voltage side switches; The three high-voltage side switches are correspondingly connected to the three-phase high-voltage windings of the transition transformer, and the three low-voltage side switches are correspondingly connected to the three-phase low-voltage windings of the transition transformer.

7. The on-load capacity-adjustable transition device for dry-type transformers according to claim 1, wherein The low-voltage side switch closes earlier than the high-voltage side switch and disconnects later than the high-voltage side switch.

8. A capacity-adjustable transformer, characterized in that, It includes the on-load capacity-adjustable transition device of the dry-type transformer according to any one of claims 1-7; The high-voltage winding of the transition transformer is connected in parallel with the high-voltage winding of the capacity-adjustable transformer through the high-voltage side switch, and the low-voltage winding of the transition transformer is connected in parallel with the low-voltage winding of the capacity-adjustable transformer through the low-voltage side switch.

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