On-load tap changer and support plate, selector and preselector

Abstract

The utility model provides a kind of support plate for on-load tap-changer, a kind of selector or preselector for on-load tap-changer and a kind of on-load tap-changer, wherein, by means of the support plate, the electrical wires of the fixed contacts of the selector or preselector of on-load tap-changer can be well managed.The support plate (100) is used to be mounted to the selector body (11) of the selector (10) or the preselector body (41) of the preselector (40) of on-load tap-changer, and the support plate has a hole pattern, which includes a predetermined distribution of receiving holes (101) for guiding the electrical wires (19) passing through each fixed contact (18) of the selector or the preselector.

Description

Technical Field

[0001] This application relates to a support plate for an on-load tap changer, a selector for an on-load tap changer, a preselector 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 support plate for an on-load tap changer, a selector or preselector for an on-load tap changer having the support plate, and an on-load tap changer having the selector and / or the preselector, wherein the support plate enables efficient management of the electrical wires of the fixed contacts of the selector or preselector of the on-load tap changer.

[0005] The first aspect of this utility model proposes a support plate for an on-load tap changer, characterized in that the support plate is used for mounting to the selector body of the selector of the on-load tap changer or the preselector body of the preselector, the support plate having a hole pattern including predetermined receiving holes for guiding electrical wires passing through the fixed contacts of the selector or the preselector.

[0006] With the help of this support plate, the electrical wires of each fixed contact of the selector or preselector can be well managed, wherein the predetermined sequence of each electrical wire and the predetermined spacing between them can be reliably guaranteed.

[0007] In one advantageous embodiment, the hole pattern of the support plate may include two rows of receiving holes.

[0008] In an advantageous embodiment, the two rows of receiving holes extend parallel to each other.

[0009] In an advantageous embodiment, the first column of receiving holes in the two columns is used to receive electrical wires disposed on a first side of the selector body, and the second column of receiving holes in the two columns is used to receive electrical wires disposed on a second side of the selector body.

[0010] In an advantageous embodiment, the support plate is used to be mounted to a side wall of the selector body or the preselector body, the longitudinal extension of the support plate being parallel to the longitudinal extension of the side wall.

[0011] In an advantageous embodiment, the support plate has at least one, for example exactly two, connection points on each of two opposing longitudinal sides, and the support plate is fastened to the selector body or preselector body at each of the connection points by means of fasteners, such as screws.

[0012] In one advantageous embodiment, the support plate is manufactured as a single piece.

[0013] In one advantageous embodiment, the support plate is made of plastic by injection molding.

[0014] A second aspect of this invention proposes a selector for an on-load tap changer, the selector having a selector body having a plurality of fixed contacts that can be selectively contacted by a moving contact of a Maltese wheel, each fixed contact being provided with an electrical conductor, characterized in that the selector further includes a support plate for an on-load tap changer according to any embodiment of this application, the support plate having receiving holes that guide the electrical conductors passing through each fixed contact of the selector.

[0015] Such a selector can have the advantages brought by the support plate according to the first aspect of this utility model.

[0016] In one advantageous embodiment, the selector includes a first Maltese wheel disposed on a first side of the selector body and a first drive for driving the first Maltese wheel, and the selector includes a second Maltese wheel disposed on a second side of the selector body and a second drive for driving the second Maltese wheel.

[0017] In an advantageous embodiment, the first driver and the second driver are arranged offset about a common axis of rotation, for example, offset by 180°.

[0018] In an advantageous embodiment, the first driver and the second driver are mounted on the same drive shaft and can be driven by the drive shaft.

[0019] In one advantageous embodiment, the electrical wires of each fixed contact are alternately arranged on the first and second sides of the selector body.

[0020] In one advantageous embodiment, the selector has nine fixed contacts evenly distributed on a circle, and thus correspondingly has nine associated electrical wires.

[0021] A third aspect of this invention proposes a preselector for an on-load tap changer, the preselector having a preselector body having a plurality of fixed contacts that can be selectively contacted by movable contacts of a Maltese wheel, each fixed contact being provided with an electrical conductor, characterized in that the preselector further includes a support plate for an on-load tap changer according to any embodiment of this application, the support plate having receiving holes that guide the electrical conductors passing through each fixed contact of the preselector.

[0022] Such a preselector can have the advantages brought by the support plate according to the first aspect of this utility model.

[0023] A fourth aspect of this invention proposes an on-load tap changer, characterized in that the on-load tap changer includes a selector for an on-load tap changer according to this invention and / or a preselector for an on-load tap changer according to this invention.

[0024] Such an on-load tap changer can have the advantages brought by the support plate according to the first aspect of this utility model.

[0025] 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

[0026] 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:

[0027] 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.

[0028] Figure 2 yes Figure 1 A perspective view of the selector's support plate viewed from the front.

[0029] Figure 3 yes Figure 1A perspective view of the support plate of the selector from the rear side.

[0030] Figure 4 yes Figure 1 A perspective view of the selector's driver component.

[0031] Figure 5 It is a circuit diagram of an on-load tap changer that includes a load transfer switch and a selector.

[0032] Figure 6 This is a schematic diagram of an on-load tap changer according to one embodiment of the present invention. Detailed Implementation

[0033] 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 5 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.

[0034] 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 6 The 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.

[0035] 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 5 .

[0036] As in Figure 5 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.

[0037] 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.

[0038] 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.

[0039] exist Figure 5 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] like Figures 1 to 3 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.

[0046] 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.

[0047] In addition to applying the support plate 100 to the selector 10, the support plate 100 can also be similarly applied to the preselector. The support plate provided to the preselector can serve a similar function. Typically, the preselector can have fewer electrical wires than the selector. In this case, the support plate can have fewer receiving holes, or, if the same support plate is used, some of the receiving holes of the support plate can be left unoccupied by electrical wires.

[0048] Figure 6A 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. Here, each selector 10 or a portion of selectors 10, and / or each preselector 40 or a portion of preselectors 40, may be equipped with the support plate 100 that has been described in detail above.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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 support plate for an on-load tap changer, characterized in that, The support plate (100) is used to mount to the selector body (11) of the selector (10) of the on-load tap changer or the preselector body of the preselector. The support plate has a hole pattern including predetermined receiving holes (101) for guiding electrical wires (19) through the fixed contacts (18) of the selector or the preselector.

2. The support plate for an on-load tap changer according to claim 1, characterized in that, The hole pattern of the support plate includes two rows of receiving holes.

3. The support plate for an on-load tap changer according to claim 2, characterized in that, The two rows of receiving holes extend parallel to each other.

4. The support plate for an on-load tap changer according to claim 3, characterized in that, The first of the two columns of receiving holes is used to receive electrical wires disposed on the first side (20) of the selector body, and the second of the two columns of receiving holes is used to receive electrical wires disposed on the second side (30) of the selector body.

5. The support plate for an on-load tap changer according to any one of claims 1 to 4, characterized in that, The support plate is used to be mounted on a side wall of the selector body or the preselector body, and the longitudinal extension of the support plate is parallel to the longitudinal extension of the side wall.

6. The support plate for an on-load tap changer according to claim 5, characterized in that, The support plate has at least one connection point (102) on each of two opposite longitudinal sides, and the support plate is fastened to the selector body or preselector body at the connection point by means of fasteners.

7. A selector for an on-load tap changer, the selector (10) having a selector body (11) having a plurality of fixed contacts (18) that can be selectively contacted by a moving contact of a Maltese wheel, each fixed contact being provided with an electrical conductor (19), characterized in that, The selector further includes a support plate (100) for an on-load tap changer according to any one of claims 1 to 6, wherein receiving holes in the support plate guide electrical wires through the fixed contacts of the selector.

8. The selector for an on-load tap changer according to claim 7, characterized in that, The selector includes a first Maltese wheel (23) disposed on a first side (20) of the selector body and a first driver (25) for driving the first Maltese wheel, and the selector includes a second Maltese wheel (33) disposed on a second side (30) of the selector body and a second driver (35) for driving the second Maltese wheel, the first driver and the second driver being staggered around a common axis of rotation, and the electrical wires of each fixed contact being alternately disposed on the first side and the second side of the selector body.

9. A preselector for an on-load tap changer, the preselector (40) having a preselector body (41) having a plurality of fixed contacts that can be selectively contacted by moving contacts of a Maltese wheel, each fixed contact being provided with an electrical conductor, characterized in that, The preselector further includes a support plate (100) for an on-load tap changer according to any one of claims 1 to 6, wherein receiving holes in the support plate guide electrical wires through the fixed contacts of the preselector.

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 claimed in claim 7 or 8 and / or a preselector (40) for an on-load tap changer as claimed in claim 9.

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