Drive assembly for selector of on-load tap changer and on-load tap changer

Abstract

The utility model provides a kind of driver assembly for the selector of on-load tap-changer, a kind of selector for on-load tap-changer and a kind of on-load tap-changer, wherein the driver assembly (50) includes first driver (25) and second driver (35), first driver is used to drive the first Malta wheel (23) of selector, second driver is used to drive the second Malta wheel (33) of selector, first driver and second driver are respectively axially movable, and anti-torsion is sleeved on same transmission shaft (43), first driver and second driver are arranged staggeredly around transmission shaft, and first driver and second driver are connected with each other by buckle connection in the case where first driver and second driver are spaced apart by predetermined axial distance. The driver assembly is assembly-friendly, and the axial movability of first and second drivers relative to transmission shaft can be realized.

Description

Technical Field

[0001] This application relates to a driver assembly for a selector of an on-load tap changer, a selector for an on-load tap changer, and an on-load tap changer. Background Technology

[0002] An on-load tap changer is a voltage regulating device used in an adjustable transformer to adjust the output voltage. It can switch the position of the winding taps without interrupting the load current, and achieve voltage regulation by changing the number of winding turns.

[0003] An on-load tap changer may include a selector and a preselector. In its simplest form, an on-load tap changer may simply include a selector with N tap contacts, each connected to a mating tap of the regulating winding of an adjustable transformer. Therefore, such an on-load tap changer has a position adjustment range of N positions, and the adjustable transformer including such an on-load tap changer has a voltage regulation range of N voltages. To extend the voltage regulation range of the adjustable transformer, a preselector may be provided in addition to the selector. The preselector can selectively connect the regulating winding of the adjustable transformer to the main winding of the adjustable transformer in the same or opposite directions. With the aid of the preselector, a portion of the main winding can be selectively disconnected or connected; that is, the portion of the main winding can be selectively connected or disconnected from the regulating winding. Utility Model Content

[0004] The objective of this invention is to provide a driver assembly for an on-load tap changer selector, a selector for an on-load tap changer having the driver assembly, and an on-load tap changer having the selector, wherein the driver assembly is assembly-friendly, in other words, the driver assembly can be easily assembled. Furthermore, the driver assembly enables axial movement of the first and second drivers relative to the drive shaft.

[0005] The first aspect of this utility model proposes a driver assembly for a selector of an on-load tap changer, characterized in that the driver assembly includes a first driver and a second driver, the first driver being used to drive a first Maltese wheel of the selector, the second driver being used to drive a second Maltese wheel of the selector, the first driver and the second driver being respectively axially movable and torsionally mounted on the same drive shaft, the first driver and the second driver being staggered around the drive shaft, and the first driver and the second driver being connected to each other by a snap-fit ​​connection when the first driver and the second driver are spaced apart by a predetermined axial distance.

[0006] The drive assembly is assembly-friendly; in other words, it can be easily assembled. This allows for the advantageous manufacture of the drive assembly, and consequently, the selector. Furthermore, the drive assembly allows for axial movement of both the first and second drives relative to the drive shaft, thus tolerating larger errors.

[0007] In an advantageous embodiment, one of the first driver and the second driver has at least one snap-fit ​​slot, and the other of the first driver and the second driver has at least one snap-fit ​​hook that mates with the at least one snap-fit ​​slot.

[0008] In an advantageous embodiment, one of the first and second drives has two snap-fit ​​slots opposite each other, and the other of the first and second drives has two snap-fit ​​hooks opposite each other that mate with the two snap-fit ​​slots.

[0009] In an advantageous embodiment, the first driver has the latching slot, and the second driver has the latching hook.

[0010] In an advantageous embodiment, the first driver has a first sleeve extending toward the second driver, and the second driver has a second sleeve extending toward the first driver. The first sleeve and the second sleeve are insertable into each other and are axially locked to each other by the establishment of the snap-fit ​​connection.

[0011] In an advantageous embodiment, the snap hook and snap groove are disposed in the region of the free end of the associated sleeve.

[0012] In an advantageous embodiment, the first driver and the second driver each have non-circular, in particular rectangular, through-holes, through which the first driver and the second driver are fitted onto a non-circular, in particular rectangular drive shaft, such that the first driver and the second driver are respectively torsionally connected to the drive shaft.

[0013] In an advantageous embodiment, the first sleeve and the second sleeve each have a rectangular, in particular a square, cross-section.

[0014] In an advantageous embodiment, the first drive has a first protrusion for engaging with a first Maltese wheel, and the second drive has a second protrusion for engaging with a second Maltese wheel.

[0015] A second aspect of this invention proposes a selector for an on-load tap changer, the selector having a selector body, a first Maltese wheel disposed on a first side of the selector body, and a second Maltese wheel disposed on a second side of the selector body. The selector body has a plurality of fixed contacts, the first Maltese wheel has a first moving contact, and the second Maltese wheel has a second moving contact. The fixed contacts are selectively contactable by the first moving contact of the first Maltese wheel and the second moving contact of the second Maltese wheel. The selector further includes a driver assembly for an on-load tap changer according to any embodiment of this application.

[0016] Such a selector can have the advantages of the driver assembly according to the first aspect of this utility model.

[0017] In an advantageous embodiment, the first driver and the second driver are arranged 180° apart about a common axis of rotation (or, about a drive shaft).

[0018] In an advantageous embodiment, the selector has a plurality of, for example, nine, fixed contacts evenly distributed on a circle.

[0019] A third aspect of this invention proposes an on-load tap changer, characterized in that the on-load tap changer includes a selector for the on-load tap changer according to this invention.

[0020] Such an on-load tap changer can have the advantages of the driver assembly according to the first aspect of this utility model.

[0021] The technical features mentioned above, those to be mentioned below, and those shown individually in the accompanying drawings can be combined arbitrarily, provided that the combined technical features are not contradictory. All feasible combinations of features are the technical content explicitly described herein. Any one of the multiple sub-features contained in the same statement can be applied independently, without necessarily being applied together with other sub-features. Attached Figure Description

[0022] The embodiments of this utility model will then be further explained by way of example with the aid of the accompanying drawings. The drawings are as follows:

[0023] Figure 1 This is a perspective view of a selector for an on-load tap changer according to a preferred embodiment of the present invention.

[0024] Figure 2 yes Figure 1 A perspective view of the first driver of the selector's driver assembly along with the drive shaft.

[0025] Figure 3 yes Figure 1 A perspective view of the second driver of the selector's driver assembly along with the drive shaft.

[0026] Figure 4 yes Figure 1 A perspective view of the selector's driver component.

[0027] Figure 5 yes Figure 1 A cross-sectional view of the first and second drivers of the selector's driver assembly in the connected state.

[0028] Figure 6 It is a circuit diagram of an on-load tap changer that includes a load transfer switch and a selector.

[0029] Figure 7 This is a schematic diagram of an on-load tap changer according to one embodiment of the present invention. Detailed Implementation

[0030] exist Figure 1 A preferred embodiment of selector 10 is shown, which includes a selector body 11, which may be configured as an insulating plate. The selector body 11 may be made of an insulating material, such as plastic or fiber-reinforced plastic (e.g., polyamide or a mixture of polyphthalic acid including glass fibers). The selector body 11 is exemplary generally rectangular and has a first side 20 and an opposite second side 30. A plurality of fixed contacts 18 (nine in the present embodiment) extend from the first side 20 through the selector body 11 to the second side 30, and are evenly distributed in a circle. These fixed contacts 18... Figure 1 The middle was covered by the first Maltese wheel 23, and in Figure 6 The diagram is schematic. A first Maltese wheel 23 is rotatably mounted on a first side 20 of the selector body 11. The first Maltese wheel includes a first moving contact 21, which is movable along with the first Maltese wheel 23. For embodiments of the first moving contact 21 and the fixed contact 18, please refer to the applicant's invention patent application CN108463868A, the contents of which form part of the disclosure of this application by reference.

[0031] In addition to the first Maltese wheel 23, a first drive 25 is provided, which is operated via a drive shaft 43 extending through the selector body 11. This drive shaft 43 is equipped with a gear 1, which can be driven by a motor 2 (see...). Figure 7The motor's output shaft can be orthogonal to the rotation axis of the drive shaft 43. Here, the first driver 25 has a first protrusion 26, which is engaged in the first Maltese wheel 23 and intermittently drives the first Maltese wheel to rotate.

[0032] Similar to the combination structure of the Maltese wheel and actuator on the first side 20 of the selector body 11, another combination structure of the Maltese wheel and actuator is also provided on the second side 30 of the selector body 11. For clarity, the reference numerals of the components of the combination structure on the second side 30 of the selector body 11 are correspondingly increased by 10, that is, the second Maltese wheel is indicated by 33, the second moving contact of the second Maltese wheel is indicated by 31, the second actuator is indicated by 35, the second protrusion of the second actuator is indicated by 36, and the second terminal for the second moving contact is indicated by 37. See [link to relevant documentation]. Figure 6 .

[0033] As in Figure 6 As schematically illustrated, each fixed contact 18 has a first contact area 22 on a first side of the selector body and a second contact area 32 on a second side of the selector body. The contact between the fixed contact 18 and the first moving contact 21 on the first side 20 is made through the corresponding first contact area 22, and the contact between the fixed contact 18 and the second moving contact 31 on the second side 30 is made through the corresponding second contact area 32.

[0034] When the selector 10 is operated, the first drive 25 rotates 360° via the corresponding operation of the drive shaft 43. When the first drive 25 and the first Maltese wheel 23 work together, the first Maltese wheel 23 rotates only a small portion of a full rotation for every full rotation of the first drive 25. Through the combination of the first drive 25 and the first Maltese wheel 23, the continuous rotational motion of the first drive 25 is intermittently converted into the rotation of the first Maltese wheel 23.

[0035] Similarly, when the selector 10 is operated, the second drive 35 rotates 360° via the corresponding operation of the same drive shaft 43. When the second drive 35 and the second Maltese wheel 33 work together, the second Maltese wheel 33 rotates only a small portion of a full rotation for the second drive 35 to rotate a full rotation. Through the combination of the second drive 35 and the second Maltese wheel 33, the continuous rotational motion of the second drive 35 is intermittently transformed into the rotation of the second Maltese wheel 33.

[0036] exist Figure 6 The diagram schematically illustrates an on-load tap changer 15, which includes a selector 10 and a load transfer switch 14. The selector 10 has a first side 20 and a second side 30, for example, nine fixed contacts 18 evenly distributed on a circle on the selector body 10 (for simplicity, in...). Figure 5(Only five fixed contacts 18 are schematically shown). Each fixed contact 18 is electrically connected to a winding tap 16 of the regulating winding 17 of the adjustable transformer via a wire 19. The first moving contact 21 is electrically connected to the first branch 12 of the load changeover switch 14 via a first terminal 27. The second moving contact 31 is electrically connected to the second branch 13 of the load changeover switch 14 via a second terminal 37. Furthermore, the load changeover switch 14 is electrically connected to the load lead-out line 51 and thereby to ground potential. Inside the load changeover switch 14, switching from the first branch 12 to the second branch 13 and from the second branch 13 to the first branch 12 is performed under load via different switching mechanisms 52.

[0037] like Figure 4 As shown, the first driver 25 is offset relative to the second driver 35, or in other words, the first protrusion 26 is offset relative to the second protrusion 36, and they can be offset by 180° around the rotation axis of the drive shaft 43. When the drive shaft 43 rotates, the offset arrangement of the first protrusion 26 and the second protrusion 36 enables the first Maltese wheel 23 and the second Maltese wheel 33, and thereby the first motion contact 21 and the second motion contact 31 to be operated in a time-staggered manner.

[0038] Before the first Maltese wheel 23 is actuated, the first moving contact 21 is always in contact with one of the fixed contacts 18 on the first side 20 of the selector body 11, and at this time, the fixed contact is electrically connected to the first terminal 27 of the first branch 12 of the load changeover switch 14. When the selector 10 is actuated, the first Maltese wheel 23 rotates, and at this time, the first moving contact 21 changes from the fixed contact 18 to an adjacent fixed contact 18.

[0039] Similarly, before the second Maltese wheel 33 is actuated, the second moving contact 31 always contacts one of the fixed contacts 18 on the second side 30 of the selector body 11, and at this time, the fixed contact is electrically connected to the second terminal 37 of the second branch 13 of the load changeover switch 14. When the selector 10 is actuated, the second Maltese wheel 33 rotates, and at this time, the second moving contact 31 switches from the fixed contact 18 to an adjacent fixed contact 18.

[0040] In the current implementation, before the operation of the selector 10 begins, i.e. in a stationary state, the first moving contact 21 and the second moving contact 31 can contact the same fixed contact 18; however, this can also be varied as needed.

[0041] The electrical wires 19 that connect each fixed contact 18 to the corresponding winding tap 16 extend alternately on the first side 20 and the second side 30 of the selector body 11. This increases the insulation distance between the electrical wires 19.

[0042] like Figure 1 As shown, the selector 10 has a support plate 100 mounted to the selector body 11, more specifically, to one sidewall of the selector body. The longitudinal extension of the support plate 100 may be parallel to the longitudinal extension of the sidewall. The support plate 100 has a hole pattern including predetermined receiving holes 101 for guiding electrical wires 19 through the fixed contacts 18 of the selector 10. In the current embodiment, the hole pattern of the support plate 100 includes two rows of receiving holes 101 extending parallel to each other. The first row of receiving holes is used to receive five electrical wires 19 disposed on a first side 20 of the selector body 11, while the second row of receiving holes is used to receive four electrical wires 19 disposed on a second side 30 of the selector body 11. The support plate 100 has two connection portions 102 on each of the two opposite longitudinal sides, i.e., a total of four connection portions 102. The support plate 100 is fastened to the selector body 11 at the connection portion 102 by means of fasteners, especially screws.

[0043] The support plate 100 can be made of plastic or any other suitable material, especially as a single piece. The support plate 100 allows for efficient management of the electrical wires 19 of each fixed contact 18. The predetermined sequence of the electrical wires 19 and the predetermined spacing between them can be reliably guaranteed. The selector 10 can be easily installed into the on-load tap changer. Users can easily operate these electrical wires 19 and their associated fixed contacts 18.

[0044] like Figures 2 to 5As shown, the first driver 25 and the second driver 35 mentioned above form a driver assembly 50 on the drive shaft 43. The first driver 25 and the second driver 35 are respectively axially movable but torsionalally resisted on the same drive shaft 43. The first driver 25 and the second driver 35 are arranged 180° offset around the drive shaft 43. The first driver 25 and the second driver 35 are connected to each other by a snap-fit ​​connection when the first driver and the second driver are spaced apart by a predetermined axial distance. Here, the first driver 25 has a first sleeve 28, which may have a rectangular outline, and two opposing snap-fit ​​slots 29 are provided in the region of the free end of the first sleeve 28. The second driver 35 has a second sleeve 38, which may have a rectangular outline, and two opposing snap-fit ​​hooks 39 are provided in the region of the free end of the second sleeve 38. The first actuator 25 and the second actuator 35 each have rectangular through-holes, and are fitted onto a drive shaft 43 with a rectangular cross-section through their respective rectangular through-holes, such that the first actuator 25 and the second actuator 35 are respectively torsionally connected to the drive shaft 43. The first sleeve 28 and the second sleeve 38 can be inserted into each other and can be axially locked together by the establishment of the snap-fit ​​connection (i.e., when the snap hook 39 is engaged in the corresponding snap slot 29). In the illustrated embodiment, the first sleeve has a larger size than the second sleeve, so that the second sleeve can be inserted into the first sleeve. It is understood that the reverse arrangement is also possible, wherein the second sleeve has a larger size than the first sleeve, so that the first sleeve can be inserted into the second sleeve.

[0045] Figure 7 A preferred embodiment of the on-load tap changer 15 is schematically shown. In this embodiment, the on-load tap changer 15 is constructed based on the principle of resistance and includes three selectors 10, three preselectors 40, and three load changeover switches 14. Each selector 10, each preselector 40, and each load changeover switch 14 is configured for a specific phase of the adjustable transformer. Thus, a single phase of the on-load tap changer 15 includes only one selector 10, one preselector 40, and one load changeover switch 14. Each selector 10 has a plate-shaped selector body 11, each preselector 40 has a plate-shaped preselector body 41, and each load changeover switch 14 has a body 4. Each body is preferably made of an insulating material, such as plastic or fiber-reinforced plastic. These bodies are pushed onto and held by a lever 3 one by one. A common drive shaft 43 drives all the selectors 10, preselectors 40, and load changeover switches 14. The drive shaft 42 is driven by a motor 2 by means of a gear 1, wherein a bevel gear transmission mechanism is preferably used.

[0046] It should be noted that the terminology used herein is for illustrative purposes only and is not intended to limit the disclosure. The singular forms “a” and “the one” as used herein should include the plural forms unless the context explicitly states otherwise. It is understood that the terms “comprising” and “including,” and other similar terms, when used in the application documents, specifically describe the presence of the stated operation, element, and / or component, without excluding the presence or addition of one or more other operations, elements, components, and / or combinations thereof. The term “and / or” as used herein includes all arbitrary combinations of one or more of the associated listed items. In the description of the drawings, similar reference numerals always denote similar elements.

[0047] The thickness of the elements in the accompanying drawings may be exaggerated for clarity. It is also understood that if an element is described as being on, coupled to, or connected to another element, then the element may be directly formed on, coupled to, or connected to the other element, or there may be one or more intermediate elements between them. Conversely, if the expressions "directly on," "directly coupled to," and "directly connected to" are used herein, it indicates that there is no intermediate element. Other terms used to describe relationships between elements should be interpreted similarly, such as "between" and "directly between," "attached" and "directly attached," "adjacent" and "directly adjacent," etc.

[0048] Terms such as “top,” “bottom,” “above,” “below,” “over,” “under,” etc., are used to describe the relationship of one element, layer, or region relative to another element, layer, or region, as shown in the accompanying drawings. It is understood that these terms should also encompass other orientations of the device in addition to those described in the accompanying drawings.

[0049] It is understood that although the terms "first," "second," etc., may be used herein to describe different elements, these elements should not be limited by these terms. These terms are merely used to distinguish one element from another. Therefore, a first element may be referred to as a second element without departing from the teachings of this inventive concept.

[0050] It can also be considered that all the exemplary embodiments disclosed herein can be arbitrarily combined with each other. Finally, it should be noted that the above embodiments are only used to understand the present invention and do not constitute a limitation on the protection scope of the present invention. For those skilled in the art, modifications can be made based on the above embodiments, and these modifications do not depart from the protection scope of the present invention.

Claims

1. A driver assembly for a selector of an on-load tap changer, characterized in that, The drive assembly (50) includes a first drive (25) and a second drive (35). The first drive is used to drive the first Malt wheel (23) of the selector, and the second drive is used to drive the second Malt wheel (33) of the selector. The first drive and the second drive are respectively axially movable and torsionally mounted on the same drive shaft (43). The first drive and the second drive are staggered around the drive shaft. The first drive and the second drive are connected to each other by a snap-fit ​​connection when the first drive and the second drive are spaced apart by a predetermined axial distance.

2. The driver assembly for an on-load tap changer selector according to claim 1, characterized in that, One of the first driver and the second driver has at least one snap-fit ​​slot (29), and the other of the first driver and the second driver has at least one snap-fit ​​hook (39) that mates with the at least one snap-fit ​​slot.

3. The driver assembly for an on-load tap changer selector according to claim 2, characterized in that, One of the first driver and the second driver has two latching slots (29) opposite to each other, and the other of the first driver and the second driver has two latching hooks (39) opposite to each other that mate with the two latching slots.

4. The driver assembly for an on-load tap changer selector according to claim 2 or 3, characterized in that, The first driver has the latching slot (29), and the second driver has the latching hook (39).

5. The driver assembly for an on-load tap changer selector according to claim 1, characterized in that, The first driver has a first sleeve (28) extending toward the second driver, and the second driver has a second sleeve (38) extending toward the first driver. The first sleeve and the second sleeve are insertable into each other and are axially locked to each other by the establishment of the snap-fit ​​connection.

6. The driver assembly for an on-load tap changer selector according to claim 2 or 3, characterized in that, The first driver has a first sleeve (28) extending toward the second driver, and the second driver has a second sleeve (38) extending toward the first driver. The first sleeve and the second sleeve are insertable into each other and are axially locked to each other by the establishment of the snap-fit ​​connection, wherein the snap-fit ​​hook and snap-fit ​​groove are provided in the region of the free end of the sleeve.

7. The driver assembly for an on-load tap changer selector according to any one of claims 1 to 3, characterized in that, The first driver and the second driver each have non-circular perforations. The first driver and the second driver are fitted onto the non-circular drive shaft through their respective perforations, so that the first driver and the second driver are respectively connected to the drive shaft in a torsion-resistant manner.

8. The driver assembly for an on-load tap changer selector according to any one of claims 1 to 3, characterized in that, The first drive has a first protrusion (26) for engaging with a first Maltese wheel, and the second drive has a second protrusion (36) for engaging with a first Maltese wheel.

9. A selector for an on-load tap changer, the selector (10) having a selector body (11), a first Maltese wheel (23) disposed on a first side (20) of the selector body, and a second Maltese wheel (33) disposed on a second side (30) of the selector body, the selector body having a plurality of fixed contacts (18), the first Maltese wheel having a first moving contact (21), the second Maltese wheel having a second moving contact (31), the fixed contacts being selectively contactable by the first moving contact of the first Maltese wheel and the second moving contact of the second Maltese wheel, characterized in that, The selector further includes a driver assembly (50) for an on-load tap changer according to any one of claims 1 to 8.

10. An on-load tap changer, characterized in that, The on-load tap changer includes a selector (10) for an on-load tap changer as described in claim 9.

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