Dry-type transformer on-load tap changer and transformer

Abstract

The present invention provides a dry-type transformer on-load tap-changing switch and a transformer, which relate to the technical field of transformers and aim to solve the technical problem that the existing dry-type transformer on-load tap-changing switch has a large volume due to the high-voltage insulation design between each conductive point. The dry-type transformer on-load tap-changing switch includes a base, a fixed plate, a switch mechanism and a drive mechanism; the fixed plate is located above the base, and a high-voltage insulator is provided between the fixed plate and the base; the switch mechanism is connected to the fixed plate via a low-voltage insulator; the drive mechanism is mounted on the base and connected to the switch mechanism, and can drive the switch mechanism to adjust the voltage. The transformer includes the dry-type transformer on-load tap-changing switch as described above. The dry-type transformer on-load tap-changing switch provided by the present invention uses graded insulation and is smaller in size.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to a dry-type transformer on-load tap-changing switch and a transformer. Background Art

[0002] A voltage-regulating transformer is a transformer capable of adjusting its output voltage. The tap changer on an on-load tap-changing transformer regulates the voltage during operation. The basic principle of an on-load tap-changing switch is to introduce several taps into the transformer's high-voltage winding. Without interrupting the load current, the on-load tap changer switches from one tap to another, changing the effective number of turns—that is, the transformer's voltage ratio—to achieve voltage regulation.

[0003] Insulation design is required between each conductive point of the transformer on-load tap changer. The existing dry-type transformer on-load tap changer has a high-voltage insulation design between each conductive point, which results in a large volume of the existing dry-type transformer on-load tap changer. Summary of the Invention

[0004] The object of the present invention is to provide a dry-type transformer on-load tap changer and a transformer, so as to solve the technical problem that the existing dry-type transformer on-load tap changer has a large volume due to the high-voltage insulation design between each conductive point.

[0005] In a first aspect, the present invention provides a dry-type transformer on-load tap-changing switch, the dry-type transformer on-load tap-changing switch comprising a base, a fixing plate, a switch mechanism and a drive mechanism;

[0006] The fixing plate is located above the base, and a high-voltage insulator is provided between the fixing plate and the base;

[0007] The switch mechanism is connected to the fixed plate via a low voltage insulator;

[0008] The driving mechanism is installed on the base and connected to the switch mechanism, and can drive the switch mechanism to adjust the voltage.

[0009] As a further solution of the first aspect of the present invention, the driving mechanism includes a first driving assembly and a second driving assembly, and the switching mechanism includes a switching switch and a selection switch;

[0010] The switch is connected to the first drive assembly and can be turned on or off when driven by the first drive assembly;

[0011] The selection switch is connected to the second driving assembly and can be turned on or off when driven by the second driving assembly.

[0012] As a further solution of the first aspect of the present invention, the switching switch includes a vacuum bubble and a touch member;

[0013] The vacuum bubble is arranged on the fixed plate through a low-voltage insulator;

[0014] The contact member is connected to the first driving component and can push or release the moving end of the vacuum bubble under the drive of the first driving component.

[0015] As a further solution of the first aspect of the present invention, the first drive assembly includes an electric mechanism electromagnet and a first transmission rod;

[0016] The electromagnet of the electric mechanism is installed on the base, and the first transmission rod is connected to the iron core of the electromagnet of the electric mechanism;

[0017] The contact member is connected to the first transmission rod through a low-voltage insulator.

[0018] As a further solution of the first aspect of the present invention, a plurality of the switching switches are arranged at intervals along the movement direction of the first transmission rod;

[0019] The first driving assembly includes a plurality of first transmission rods connected in sequence, and the plurality of contact members are connected to the plurality of first transmission rods in a one-to-one correspondence;

[0020] The first driving assembly further includes a first insulating rod, and two adjacent first transmission rods are connected via the first insulating rod.

[0021] As a further solution of the first aspect of the present invention, the selector switch includes a moving contact and two stationary contacts arranged at intervals;

[0022] The moving contact is connected to the second driving assembly and can be brought into contact with or separated from the two static contacts under the drive of the second driving assembly.

[0023] As a further solution of the first aspect of the present invention, the second driving assembly includes a permanent magnet mechanism electromagnet and a second transmission rod;

[0024] The permanent magnet mechanism electromagnet is installed on the base, and the second transmission rod is connected to the iron core of the permanent magnet mechanism electromagnet;

[0025] The moving contact is connected to the second transmission rod through a low-voltage insulator.

[0026] As a further solution of the first aspect of the present invention, a plurality of the selection switches are arranged at intervals along the movement direction of the second transmission rod;

[0027] The second drive assembly includes a plurality of second transmission rods connected in sequence, and the plurality of moving contacts are connected to the plurality of second transmission rods in a one-to-one correspondence;

[0028] The second driving assembly further includes a second insulating rod, and two adjacent second driving rods are connected via the second insulating rod.

[0029] As a further solution of the first aspect of the present invention, the on-load tap changer of the dry-type transformer further includes a transition resistor, and the transition resistor is connected to the switch.

[0030] In a second aspect, the present invention provides a transformer, which includes the dry-type transformer on-load tap changer as described above.

[0031] In combination with the above technical solutions, the beneficial effects brought about by the present invention are analyzed as follows:

[0032] The present invention provides a dry-type transformer on-load tap-changing switch, which includes a base, a fixed plate, a switch mechanism, and a drive mechanism; the fixed plate is located above the base, and a high-voltage insulator is provided between the fixed plate and the base; the switch mechanism is connected to the fixed plate via a low-voltage insulator; the drive mechanism is installed on the base and connected to the switch mechanism, and can drive the switch mechanism to adjust the voltage. When the dry-type transformer on-load tap-changing switch is in use, the base is grounded, the high-voltage insulator and the low-voltage insulator are graded insulated, and the drive mechanism drives the switch to adjust the voltage of the transformer. The voltage between the switch mechanism and the base is relatively high, and a high-voltage insulator is provided between the fixed plate and the base for insulation; the voltage between the conductive points inside the switch mechanism is relatively low, and a low-voltage insulator is provided between the switch mechanism and the fixed plate for insulation. Compared with a design with direct high-voltage insulation between conductive points, the dry-type transformer on-load tap-changing switch uses graded insulation, is smaller in size, and requires less installation space.

[0033] The present invention also provides a transformer having the above-mentioned dry-type transformer on-load tap changer, so that the overall size of the transformer is also smaller and can be installed in a smaller space. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 A schematic structural diagram of a dry-type transformer on-load tap changer provided in an embodiment of the present invention;

[0036] Figure 2 A schematic diagram of the structure of the on-load tap changer of a dry-type transformer provided by an embodiment of the present invention after removing the transition resistor;

[0037] Figure 3 A schematic structural diagram of a driving mechanism provided in an embodiment of the present invention;

[0038] Figure 4 A schematic diagram of the structure of a switch provided in an embodiment of the present invention;

[0039] Figure 5 A schematic structural diagram of a selection switch provided in an embodiment of the present invention;

[0040] Figure 6 A schematic diagram of the structure of a dry-type transformer on-load tap changer provided in an embodiment of the present invention installed in a cabinet;

[0041] Figure 7 A schematic structural diagram of a transformer provided in an embodiment of the present invention;

[0042] Figure 8 A circuit diagram of a transformer provided in an embodiment of the present invention.

[0043] Icons: 10 - base; 20 - fixing plate; 30 - switch mechanism; 31 - changeover switch; 311 - vacuum bubble; 312 - contact piece; 32 - selector switch; 321 - moving contact; 322 - static contact; 40 - drive mechanism; 41 - first drive assembly; 411 - electric mechanism electromagnet; 412 - first transmission rod; 413 - first insulating rod; 42 - second drive assembly; 421 - permanent magnet mechanism electromagnet; 422 - second transmission rod; 423 - second insulating rod; 50 - high-voltage insulator; 60 - low-voltage insulator; 70 - transition resistor; 80 - cabinet; 81 - insulating plate. DETAILED DESCRIPTION

[0044] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0046] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted" and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0047] The present invention provides a dry-type transformer on-load tap-changing switch. Figures 1 to 7 .

[0048] like Figure 1 and Figure 2 As shown, the dry-type transformer on-load tap changer includes a base 10, a fixed plate 20, a switch mechanism 30, and a drive mechanism 40. The fixed plate 20 is located above the base 10, and a high-voltage insulator 50 is provided between the fixed plate 20 and the base 10 to provide insulation between the fixed plate 20 and the base 10. The switch mechanism 30 is connected to the fixed plate 20 via low-voltage insulators 60, which provide insulation between the switch mechanism 30 and the fixed plate 20, as well as between the various conductive points of the switch mechanism 30. The drive mechanism 40 is mounted on the base 10 and connected to the switch mechanism 30. It can drive the switch mechanism 30 to operate, and the voltage is adjusted by changing the effective number of turns of the high-voltage winding by changing the connection state within the switch mechanism 30.

[0049] When this dry-type transformer on-load tap changer is in use, the base 10 is grounded, the high-voltage insulator 50 and the low-voltage insulator 60 provide graded insulation, and the drive mechanism 40 drives the switch to adjust the transformer voltage. The voltage between the switch mechanism 30 and the base 10 is relatively high, and a high-voltage insulator 50 is provided between the fixed plate 20 and the base 10 to insulate the fixed plate 20 from the base 10. The voltage between the conductive points within the switch mechanism 30 is relatively low, and a low-voltage insulator 60 is provided between the switch mechanism 30 and the fixed plate 20 to insulate the switch mechanism 30 from the fixed plate 20 and between the conductive points of the switch mechanism 30. Compared to designs with direct high-voltage insulation between conductive points, this dry-type transformer on-load tap changer uses graded insulation, resulting in a smaller size and requiring less installation space.

[0050] like Figure 3 As shown, the driving mechanism 40 includes a first driving component 41 and a second driving component 42. Figure 2As shown, the switch mechanism 30 includes a switching switch 31 and a selection switch 32. The switching switch 31 is connected to the first drive component 41, and the first drive component 41 can drive the switching switch 31 to be connected or disconnected to realize the gear selection. The selection switch 32 is connected to the second drive component 42, and the second drive component 42 can drive the selection to be connected or disconnected to switch the load. When the on-load tap-changing switch of the dry-type transformer is regulating the voltage, the second drive component 42 first drives the switching switch 31 to operate, cutting off the load current on the on-load tap-changing switch of the dry-type transformer, avoiding arc erosion, and then the first drive mechanism 40 drives the selection switch 32 to operate to select the gear. After the gear selection is completed, the second drive component 42 drives the switching switch 31 to operate again, and re-adds the load to the on-load tap-changing switch of the dry-type transformer.

[0051] like Figure 4 The specific structure of the switch 31 is shown. The switch 31 includes a vacuum bulb 311 and a contact member 312. The vacuum bulb 311 is attached to the fixed plate 20 via a low-voltage insulator 60, providing insulation between the vacuum bulb 311 and the fixed plate 20, as well as between the vacuum bulb 311 and other conductive points. Because the dry-type transformer on-load tap changer utilizes graded insulation, for a 10kV tap changer, the terminal voltage of the vacuum bulb 311 during operation is only approximately 1000V. Therefore, a low-voltage voltage of approximately 1000-2000V is acceptable. The contact member 312 is connected to the first drive assembly 41, which can drive the contact member 312 to push or release the movable end of the vacuum bulb 311. When the contact member 312 pushes the movable end of the vacuum bulb 311, the vacuum bulb 311 is connected; when the contact member 312 releases the movable end of the vacuum bulb 311, the vacuum bulb 311 is disconnected.

[0052] like Figure 3 As shown, the first drive assembly 41 includes an electric mechanism electromagnet 411 and a first transmission rod 412. The electric mechanism electromagnet 411 is mounted on the base 10, and the first transmission rod 412 is connected to the iron core of the electric mechanism electromagnet 411. When the coil of the electric mechanism electromagnet 411 is energized, the iron core moves and drives the first transmission rod 412. By changing the direction of the current in the coil of the electric mechanism electromagnet 411, the movement direction of the iron core changes, thereby changing the movement direction of the first transmission rod 412. Figure 4The contact member 312 is connected to the first transmission rod 412 via the low-voltage insulator 60. When the first transmission rod 412 moves, it drives the contact member 312 toward or away from the vacuum bubble 311. When the first transmission rod 412 drives the contact member 312 toward the vacuum bubble 311, the contact member 312 pushes the vacuum bubble 311, connecting the vacuum bubble 311. When the first transmission rod 412 drives the contact member 312 away from the vacuum bubble 311, the contact member 312 releases the moving end of the vacuum bubble 311, disconnecting the vacuum bubble 311. The low-voltage insulator 60 between the contact member 312 and the first transmission rod 412 insulates the contact member 312 from the first transmission rod 412 and also insulates the contact member 312 from other conductive points.

[0053] like Figure 2 As shown, multiple switching switches 31 are arranged at intervals along the movement direction of the first transmission rod 412. The first drive assembly 41 includes multiple first transmission rods 412, and the multiple first transmission rods 412 are connected in sequence along their own length direction. Multiple touch members 312 are connected to the multiple first transmission rods 412 in a one-to-one correspondence, and low-voltage insulators 60 are provided between the touch members 312 and the corresponding first transmission rods. After the coil of the electric mechanism electromagnet 411 is energized, the iron core drives the multiple first transmission rods 412 to move, thereby connecting or disconnecting the multiple switching switches 31. The first drive assembly 41 also includes a first insulating rod 413, and two adjacent first transmission rods 412 are connected by the first insulating rod 413. The first insulating rod 413 constitutes the insulation between adjacent switching switches 31.

[0054] like Figure 2 and Figure 4 As shown, the dry-type transformer on-load tap changer has two rows of switches 31. The number of switches 31 in the two rows is the same and they correspond one to one. The setting direction of a switch 31 in the first row is opposite to that of the corresponding switch 31 in the second row. Figure 2 As shown, the movable ends of the switches 31 in one row face the motor-driven electromagnet 411, while the movable ends of the switches 31 in the other row face away from the motor-driven electromagnet 411. The motor-driven electromagnet 411 drives the two rows of switches 31 to operate via a plurality of first transmission rods 412. When the motor-driven electromagnet 411 drives the contact heads of the first row of switches 31 to push the movable ends of the vacuum bubbles 311, it also drives the contact heads of the second row of switches 31 to release the movable ends of the vacuum bubbles 311. Similarly, when the motor-driven electromagnet 411 drives the contact heads of the first row of switches 31 to release the movable ends of the vacuum bubbles 311, it also drives the movable ends of the vacuum bubbles 311 pushed by the contact heads of the second row of switches 31.

[0055] like Figure 5As shown, the selector switch 32 includes a movable contact 321 and two spaced-apart stationary contacts 322. The movable contact 321 is connected to the second drive assembly 42 and can make or break contact with the two stationary contacts 322 under the drive of the second drive assembly 42. When the movable contact 321 makes contact with the two spaced-apart stationary contacts 322, the two stationary contacts 322 are electrically connected. When the movable contact 321 separates from the two spaced-apart stationary contacts 322, the two stationary contacts 322 are disconnected.

[0056] like Figure 3 The second drive assembly 42 includes a permanent magnet electromagnet 421 and a second transmission rod 422. The permanent magnet electromagnet 421 is mounted on the base 10, and the second transmission rod 422 is connected to the iron core of the permanent magnet electromagnet 421. When the coil of the permanent magnet electromagnet 421 is energized, the iron core moves and drives the second transmission rod 422. By changing the direction of the current in the coil of the permanent magnet electromagnet 421, the movement direction of the iron core changes, thereby changing the movement direction of the second transmission rod 422. Also refer to Figure 5 The moving contact 321 is connected to the second transmission rod 422 via a low-voltage insulator 60. The second transmission rod 422 drives the moving contact 321 toward or away from the stationary contact 322, thereby causing the moving contact 321 to contact or disconnect with two spaced-apart stationary contacts 322. The low-voltage insulator 60 between the moving contact 321 and the second transmission rod 422 insulates the moving contact 321 from the second transmission rod 422 and from other conductive points.

[0057] like Figure 2 As shown, multiple selector switches 32 are spaced apart along the direction of motion of the second drive rod 422. The second drive assembly 42 includes multiple second drive rods 422, which are connected sequentially along their length. Multiple moving contacts 321 are connected to the multiple second drive rods 422 in a one-to-one correspondence, and low-voltage insulators 60 are provided between each moving contact 321 and its corresponding second drive rod 422. The second drive assembly 42 also includes a second insulating rod 423, connecting two adjacent second drive rods 422. The second insulating rod 423 provides insulation between adjacent selector switches 32.

[0058] like Figure 5 As shown, two adjacent selector switches 32 are arranged in a joint configuration, i.e., the static contacts 322 of the two selector switches 32 are arranged facing each other, and the two movable contacts 321 are disposed between the static contacts 322 of the two selector switches 32. When the second transmission rod 422 moves in one direction, one selector switch 32 is disconnected and the other selector switch 32 is connected. Preferably, the two movable contacts 321 are fixedly connected and share a low-voltage insulator 60 connected to the second transmission rod 422.

[0059] like Figure 1As shown, the dry-type transformer on-load tap changer further includes a transition resistor 70 connected to the selector switch 31. When the dry-type transformer on-load tap changer is regulating voltage, the second drive assembly 42 drives the selector switch 31, causing the load current to flow through the transition resistor 70 instead of the selector switch 32, thereby preventing arc erosion in the selector switch 32. The first drive mechanism 40 then drives the selector switch 32 to select a gear. After gear selection is complete, the second drive assembly 42 again drives the selector switch 31, causing the load current to flow through the selector switch 32 instead of the transition resistor 70.

[0060] like Figure 6 As shown, the dry-type transformer on-load tap changer also includes a cabinet 80. The base 10, fixing plate 20, switch mechanism 30, and drive mechanism 40 are all housed within the cabinet 80. The cabinet 80 protects the dry-type transformer on-load tap changer by reducing environmental impacts. When the dry-type transformer on-load tap changer is in use, the cabinet 80 is grounded. Furthermore, the cabinet 80 includes an insulating plate 81, through which the incoming and outgoing wires of the dry-type transformer on-load tap changer are connected to the switch mechanism 30, ensuring insulation between the wiring components and the ground.

[0061] The present invention also provides a transformer.

[0062] like Figure 7 As shown, the transformer includes the dry-type transformer on-load tap changer as described above. Since the dry-type transformer on-load tap changer is relatively small, the overall size of the transformer is also relatively small, and can be installed in a smaller space.

[0063] Specifically, the bottom of the cabinet 80 is mounted on the bottom channel steel of the dry-type transformer. The switch supporting controller can be installed on the door of the switch cabinet 80 or led to other safe areas.

[0064] Figure 8 A circuit diagram showing one of the circuit connection modes of the transformer.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dry-type transformer on-load tap changer, characterized in that: It comprises a base (10), a fixing plate (20), a switch mechanism (30) and a drive mechanism (40); The fixing plate (20) is located above the base (10), and a high-voltage insulator (50) is provided between the fixing plate (20) and the base (10); The switch mechanism (30) is connected to the fixing plate (20) via a low-voltage insulator (60); The driving mechanism (40) is installed on the base (10) and connected to the switch mechanism (30), and can drive the switch mechanism (30) to adjust the voltage; The driving mechanism (40) includes a first driving assembly (41) and a second driving assembly (42); the switching mechanism (30) includes a switching switch (31) and a selection switch (32); The switching switch (31) is connected to the first driving component (41) and can be turned on or off under the drive of the first driving component (41); The selection switch (32) is connected to the second drive component (42) and can be turned on or off under the drive of the second drive component (42); The switching switch (31) includes a vacuum bubble (311) and a touch member (312); The vacuum bubble (311) is arranged on the fixing plate (20) through a low-voltage insulator (60); The contact member (312) is connected to the first driving component (41), and is capable of pushing or releasing the moving end of the vacuum bubble (311) under the drive of the first driving component (41); The first driving assembly (41) includes an electric mechanism electromagnet (411) and a first transmission rod (412); The electric mechanism electromagnet (411) is mounted on the base (10), and the first transmission rod (412) is connected to the iron core of the electric mechanism electromagnet (411); The contact member (312) is connected to the first transmission rod (412) via a low-voltage insulator (60).

2. The dry-type transformer on-load tap changer according to claim 1, characterized in that: The plurality of switching switches (31) are arranged at intervals along the movement direction of the first transmission rod (412); The first driving assembly (41) includes a plurality of first transmission rods (412) connected in sequence, and the plurality of contact members (312) are connected to the plurality of first transmission rods (412) in a one-to-one correspondence; The first driving assembly (41) further includes a first insulating rod (413), and two adjacent first transmission rods (412) are connected via the first insulating rod (413).

3. The dry-type transformer on-load tap changer according to claim 1, characterized in that: The selection switch (32) includes a moving contact (321) and two stationary contacts (322) arranged at intervals; The moving contact (321) is connected to the second drive assembly (42) and can be brought into contact with or separated from the two stationary contacts (322) under the drive of the second drive assembly (42).

4. The dry-type transformer on-load tap changer according to claim 3, characterized in that: The second driving assembly (42) includes a permanent magnet mechanism electromagnet (421) and a second transmission rod (422); The permanent magnet mechanism electromagnet (421) is mounted on the base (10), and the second transmission rod (422) is connected to the iron core of the permanent magnet mechanism electromagnet (421); The moving contact (321) is connected to the second transmission rod (422) via a low-voltage insulator (60).

5. The dry-type transformer on-load tap changer according to claim 4, characterized in that: The plurality of selection switches (32) are arranged at intervals along the movement direction of the second transmission rod (422); The second drive assembly (42) includes a plurality of second transmission rods (422) connected in sequence, and the plurality of moving contacts (321) are connected to the plurality of second transmission rods (422) in a one-to-one correspondence; The second driving assembly (42) further includes a second insulating rod (423), and two adjacent second driving rods (422) are connected via the second insulating rod (423).

6. The dry-type transformer on-load tap changer according to claim 1, characterized in that: It also includes a transition resistor (70), which is connected to the switch (31).

7. A transformer, characterized in that: It comprises the on-load tap changer for dry-type transformer as described in any one of claims 1 to 6.

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