On-load tap-changer potential resistor fixing structure, on-load tap-changer and transformer

Abstract

The utility model relates to the field of transformers, in particular to an on-load tap-changer potential resistor fixing structure, an on-load tap-changer comprising the potential resistor fixing structure and an on-load tap-changer comprising the on-load tap-changer, and the on-load tap-changer comprises a tap selector, a change-over switch and a plurality of potential resistors. The potential resistor fixing structure comprises at least one fixing plate arranged on a connecting part between the tap selector and the change-over switch, and the plurality of potential resistors are installed on the at least one fixing plate. According to the on-load tap-changer, the fixed plate is arranged at the connecting part between the tap selector and the change-over switch, and then the potential resistor is arranged on the fixed plate, so that the potential resistor is fixed in the middle of the whole on-load tap-changer, the space occupied by the on-load tap-changer in the transformer is effectively utilized, the lead design of the transformer is integrally simplified, and the cost is reduced. And the quality and reliability of products are improved from the source.

Description

Technical Field

[0001] The present application relates to the field of transformers, and in particular to a potential resistor fixing structure of an on-load tap changer, an on-load tap changer including the potential resistor fixing structure, and an on-load tap-changing transformer including the on-load tap changer. Background Art

[0002] An on-load tap-changing transformer refers to a transformer that can adjust its transformation ratio under load. This can be achieved through an on-load tap-changer, which allows switching between taps in the transformer winding without interrupting the load current, thereby changing the number of turns of the winding, that is, the voltage ratio of the transformer, and ultimately achieving the purpose of voltage regulation.

[0003] On-load tap-changers used in transformers of 220 kV and above are bulky and have long insulation distances. During forward and reverse voltage regulation, as well as coarse and fine voltage regulation, the tap winding is temporarily separated from the main winding, causing the tap winding's potential to float. If this floating potential is high, it will discharge, decomposing the transformer oil and generating gasses, which can compromise the product's insulation performance. To address this issue, the tap winding can be connected using a potential resistor.

[0004] Traditionally, potential resistors are typically installed at the bottom of the on-load tap-changer or using separate mounting brackets attached to the transformer clamps. Either approach inadvertently increases the height of the on-load tap-changer, which in turn increases the height of the entire transformer tank, increasing transformer manufacturing costs. Alternatively, the potential resistors can be placed vertically within the tank using insulating brackets. However, this approach complicates the transformer structure, and the high mounting position of the potential resistors can compromise their mechanical strength and reliability, posing certain quality and safety risks. Utility Model Content

[0005] The purpose of the present application is to provide a potential resistor fixing structure for an on-load tap changer, an on-load tap changer including the potential resistor fixing structure, and an on-load tap-changing transformer including the on-load tap changer, aiming to solve the technical problems in the prior art of unreasonable setting of the potential resistor mounting structure, resulting in high transformer manufacturing costs and quality and safety risks.

[0006] To achieve this objective, in a first aspect, the present application provides a potential resistor fixing structure for an on-load tap changer, the on-load tap changer comprising a tap selector, a diverter switch, and a plurality of potential resistors, the potential resistor fixing structure comprising at least one fixing plate provided at a connection portion between the tap selector and the diverter switch, the plurality of potential resistors being mounted on the at least one fixing plate.

[0007] In addition to or as an alternative to one or more features described herein, a further embodiment of the potential resistor fixing structure of the on-load tap changer may include the fixing plate having a mounting portion and two connecting portions, the potential resistor being disposed on the mounting portion, the two connecting portions being located on the same side of the mounting portion and both extending from the mounting portion toward the coupling portion to be fixedly connected to the coupling portion.

[0008] In addition to or as an alternative to one or more features described herein, a further embodiment of the potential resistor fixing structure of the on-load tap changer may include that the potential resistor fixing structure further includes a plurality of vertical plates arranged on the mounting portion, and the plurality of potential resistors are arranged on the plurality of vertical plates.

[0009] In addition to or as an alternative to one or more features described herein, a further embodiment of the potential resistor fixing structure of the on-load tap changer may include that the number of the vertical plates is three, the three vertical plates are divided into two first vertical plates and one second vertical plate; the two first vertical plates are parallel to each other, the second vertical plate is located between the two first vertical plates and is perpendicular to the two first vertical plates; each of the first vertical plates is connected to the second vertical plate.

[0010] In addition to or as an alternative to one or more features described herein, further embodiments of the potential resistor fixing structure of the on-load tap changer may include each of the vertical plates and the mounting portion, and each of the first vertical plates and the second vertical plates being connected by an L-shaped connecting member; and / or the two first vertical plates being connected by an intermediate member.

[0011] In addition to or as an alternative to one or more features described herein, further embodiments of the potential resistor fixing structure of the on-load tap changer may include that the potential resistors are provided on both sides of each of the vertical plates; and / or that a plurality of mounting members are provided on one side of each of the vertical plates for mounting the potential resistors, the plurality of mounting members are divided into two columns, the plurality of potential resistors are mounted between the two columns of mounting members, and each of the mounting members is connected to at least one of the potential resistors.

[0012] In addition to or as an alternative to one or more features described herein, a further embodiment of the potential resistor fixing structure of the on-load tap changer may include that the potential resistor fixing structure further includes a support member disposed at the bottom of the fixing plate to form a support.

[0013] In addition to or as an alternative to one or more features described herein, a further embodiment of the potential resistor fixing structure of the on-load tap changer may include the support member comprising a bottom frame, a vertical frame, and a horizontal frame, the bottom frame being connected to a bottom support frame of the tap selector, the vertical frame being connected between the fixing plate and the bottom frame, and the horizontal frame being connected between the vertical frame and a side frame of the tap selector.

[0014] A second aspect of the present application provides an on-load tap changer, comprising a tap selector, a changeover switch, a plurality of potential resistors, and the above-mentioned potential resistor fixing structure.

[0015] A third aspect of the present application provides an on-load tap-changing transformer, comprising the above-mentioned on-load tap changer.

[0016] One of the above technical solutions has the following advantages or beneficial effects: by arranging the fixing plate at the connection portion between the tap selector and the diverter switch and then installing the potential resistor on the fixing plate, the potential resistor is fixed in the middle of the entire on-load tap changer, effectively utilizing the space occupied by the on-load tap changer inside the transformer, simplifying the transformer lead design as a whole, improving product quality and reliability from the source, and reducing costs.

[0017] Other advantages of the present application and the technical effects of the preferred embodiments will be further described in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 is a plan view of an on-load tap changer provided by at least one embodiment of the present application;

[0020] Figure 2 is a schematic top view of a potential resistor fixing structure provided by at least one embodiment of the present application;

[0021] Figure 3 is a front view schematic diagram of a potential resistor fixing structure provided by at least one embodiment of the present application;

[0022] Figure 4 It is a plan view of a fixing plate provided in at least one embodiment of the present application.

[0023] Among them, the reference numerals in the figures are:

[0024] 1: Tap selector 10: Connecting part 11: Bottom support frame

[0025] 12: Side frame

[0026] 2: Toggle switch

[0027] 3: Potential resistance

[0028] 4: Potential resistor fixing structure 41: Fixing plate 411: Mounting part

[0029] 412: Connecting portion 42: Vertical plate 421: First vertical plate

[0030] 422: Second vertical plate 40: L-shaped connector 420: Mounting piece

[0031] 43: Support 431: Bottom frame 432: Vertical frame

[0032] 433: horizontal frame 400: mounting hole DETAILED DESCRIPTION

[0033] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0035] It should be understood that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore cannot be understood as a limitation on this application.

[0036] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0037] In addition, in the description of the present application, “a plurality of” means two or more, unless otherwise clearly and specifically defined.

[0038] by Figures 1 to 4 Taking the example of a potential resistor fixing structure 4 of an on-load tap changer provided in the present application as an example, the present application will illustrate and introduce it. The on-load tap changer includes a tap selector 1, a switching switch 2 and a plurality of potential resistors 3. The switching switch 2 is a part specifically responsible for switching the load current, and its action is completed quickly according to a certain procedure through a fast mechanism. The tap selector 1 is a part that pre-connects the adjacent taps to be switched immediately according to the tap sequence and bears the continuous load. The switching switch 2 and the tap selector 1 are collectively referred to as the switch body, and are generally installed in the oil tank of the transformer. The switching switch 2 generates an arc when switching the load current, which will deteriorate the oil quality. Therefore, it must be installed in a separate insulating cylinder to isolate it from the oil in the transformer tank.

[0039] like Figure 1 As shown, the diverter switch 2 is typically located above the on-load tap changer, while the tap selector 1 is typically located below it. It is connected to the leads of the transformer's tap winding, with different positions on the diverter switch corresponding to different transformer tap positions, enabling selection of the tap position when the on-load tap changer is switched. The diverter switch 2 is filled with insulating liquid and isolated from the tap selector 1 by an external housing. The tap selector 1 is internally connected to the corresponding tap terminals of the diverter switch 2 via internal wiring. These two components work together to complete the on-load tap changer's transformer tap switching. Structurally, they are independent, with a connecting portion 10 between them to securely connect them into a single, integrated structure, the switch body. Each potential resistor 3 can be electrically connected to the tap selector 1 via cables.

[0040] The present application provides a potential resistor fixing structure 4 for an on-load tap changer, comprising at least one fixing plate 41 of a connecting portion 10 disposed between a tap selector 1 and a diverter switch 2, with a plurality of potential resistors 3 mounted on the at least one fixing plate 41. The material of the fixing plate 41 may be consistent with the material of the outer frame of the on-load tap changer, and the connection method between the fixing plate 41 and the connecting portion 10 includes, but is not limited to, threaded connection, snap-fit ​​connection, etc. In one embodiment, the connection between the fixing plate 41 and the connecting portion 10 is through a mounting hole 400 (positioned as shown in FIG. 1 ) at the end of the fixing plate 41. Figure 4 As shown) and bolts, the threaded connection structure is stable and reliable.

[0041] By arranging the fixing plate 41 at the connecting portion 10 between the tap selector 1 and the diverter switch 2 and then mounting the potential resistor 3 on the fixing plate 41, the potential resistor 3 is fixed in the middle of the entire on-load tap changer. This effectively utilizes the space occupied by the on-load tap changer inside the transformer, simplifies the transformer lead design as a whole, improves product quality and reliability from the source, and reduces costs.

[0042] In one embodiment of this application, please refer to Figure 2 and Figure 4 The fixing plate 41 has a mounting portion 411 and two connecting portions 412. The potential resistor 3 is arranged on the mounting portion 411. The two connecting portions 412 are located on the same side of the mounting portion 411 and are both extended from the mounting portion 411 toward the connecting portion 10 to be fixedly connected to the connecting portion 10. The structure is reasonably set, and the two connecting portions 412 form a space for avoiding the switch body, which is convenient for assembly. Optionally, the mounting portion 411 and the two connecting portions 412 can be set as Figure 4 The shape shown is easy to process and facilitates maximizing the width of the connection position between the connecting portion 412 and the mounting portion 411, which helps to improve the strength of the connecting portion 412 and the structural stability of the entire fixing plate 41. Even if the bottom of the fixing plate 41 is not provided with a support member 43 and is formed into a cantilever state, Figure 4 The shape design of the middle fixing plate 41 also helps to ensure that it has sufficient structural strength.

[0043] In one embodiment of the present application, see Figure 2 The potential resistor fixing structure 4 also includes a plurality of vertical plates 42 disposed on the mounting portion 411, and the plurality of potential resistors 3 are mounted on the plurality of vertical plates 42. The provision of the vertical plates 42 facilitates the arrangement of the plurality of potential resistors 3, fully utilizing the space occupied by the on-load tap changer within the transformer and providing a rational structural arrangement. Optionally, the plurality of vertical plates 42 can be arranged perpendicular to the mounting portion 411, facilitating structural design and assembly.

[0044] In one embodiment of this application, please continue to refer to Figure 2There are three vertical plates 42, each consisting of two first vertical plates 421 and one second vertical plate 422. The two first vertical plates 421 are parallel to each other, and the second vertical plate 422 is located between and perpendicular to the two first vertical plates 421. Each first vertical plate 421 is connected to a second vertical plate 422. Providing three vertical plates 42 fully utilizes the space on the mounting portion 411, further facilitating the arrangement of multiple potential resistors 3.

[0045] In one embodiment of this application, please refer to Figure 2 and Figure 3 Each vertical plate 42 and the mounting portion 411, as well as each first vertical plate 421 and the second vertical plate 422, are connected by an L-shaped connector 40. The L-shaped connector 40 can be an insulating member. This structure improves the structural stability between each vertical plate 42 and the mounting portion 411, as well as between each first vertical plate 421 and the second vertical plate 422. The L-shaped connector 40 is convenient for production, processing and assembly. A specific implementation method is that the vertical plate 42 can be assembled on the fixed plate 41 through the L-shaped connector 40 in combination with the insulating screw. The upper part of each first vertical plate 421 and the second vertical plate 422 can also be connected using an L-shaped insulating member to improve the overall stability and mechanical strength.

[0046] In one embodiment of the present application, the two first vertical plates 421 are connected by an intermediate piece (not shown in the figure). The structural form of the intermediate piece can be a regular U-shape, Z-shape or inverted Z-shape, or other regular shapes. Of course, it can also be set to an irregular shape as needed, which is not the only limitation here.

[0047] In one embodiment of this application, please refer to Figures 1 to 3 Potential resistors 3 are provided on both sides of each vertical plate 42, which facilitates the arrangement of multiple potential resistors 3 and improves the utilization rate of each vertical plate 42.

[0048] In one embodiment of the present application, Figure 3 As shown, each vertical plate 42 is provided with a plurality of mounting parts 420 on one side for mounting the potential resistor 3. The plurality of mounting parts 420 are divided into two columns. The plurality of potential resistors 3 are mounted between the two columns of mounting parts 420. Each mounting part 420 is connected to at least one potential resistor 3. This structure helps to improve the utilization rate of each mounting part 420 and facilitates the regular arrangement of the plurality of potential resistors 3.

[0049] In one embodiment of this application, please refer to Figure 1 and Figure 2 The potential resistor fixing structure 4 further includes a support member 43 disposed at the bottom of the fixing plate 41 to form a support.

[0050] In one embodiment of the present application, see Figure 1The support member 43 includes a bottom frame 431, a vertical frame 432 and a horizontal frame 433. The bottom frame 431 is connected to the bottom support frame 11 of the tap selector 1, the vertical frame 432 is connected between the fixing plate 41 and the bottom frame 431, and the horizontal frame 433 is connected between the vertical frame 432 and the side frame 12 of the tap selector 1. Figure 1 As shown, the fixing plate 41 can form a frame connection structure with the outer frame of the tap selector 1 through the support member 43 , which helps to improve the structural stability of the potential resistor 3 .

[0051] The present application proposes an on-load tap changer, comprising a tap selector 1, a selector switch 2, multiple potential resistors 3, and the aforementioned potential resistor fixing structure 4. The present application proposes an on-load tap-changing transformer, comprising the aforementioned on-load tap changer. The provision of the aforementioned potential resistor fixing structure 4 reduces the space occupied and the cost of the on-load tap changer and on-load tap-changing transformer, while effectively avoiding quality and safety risks associated with installing the potential resistors 3 too high.

[0052] Obviously, the above embodiments of the present application are merely examples for the purpose of clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, other variations or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present application shall be included within the scope of protection of the claims of the present application.

Claims

1. A potential resistor fixing structure for an on-load tap changer, wherein the on-load tap changer comprises a tap selector, a changeover switch and a plurality of potential resistors, characterized in that: The potential resistor fixing structure includes at least one fixing plate provided at a connection portion between the tap selector and the diverter switch, and the plurality of potential resistors are mounted on the at least one fixing plate.

2. The potential resistor fixing structure according to claim 1, characterized in that: The fixing plate has a mounting portion and two connecting portions. The potential resistor is arranged on the mounting portion. The two connecting portions are located on the same side of the mounting portion and both extend from the mounting portion toward the connecting portion to be fixedly connected to the connecting portion.

3. The potential resistor fixing structure according to claim 2, characterized in that: The potential resistor fixing structure further includes a plurality of vertical plates arranged on the mounting portion, and the plurality of potential resistors are arranged on the plurality of vertical plates.

4. The potential resistor fixing structure according to claim 3, characterized in that: There are three vertical panels, which are divided into two first vertical panels and one second vertical panel; the two first vertical panels are parallel to each other, and the second vertical panel is located between the two first vertical panels and perpendicular to the two first vertical panels; each of the first vertical panels is connected to the second vertical panel.

5. The potential resistor fixing structure according to claim 4, characterized in that: Each of the vertical plates and the mounting portion, as well as each of the first vertical plates and the second vertical plates, are connected via an L-shaped connector; And / or, the two first vertical panels are connected via an intermediate piece.

6. The potential resistor fixing structure according to any one of claims 3 to 5, characterized in that: The potential resistor is provided on both sides of each vertical plate; And / or, each vertical plate is provided with a plurality of mounting parts on one side for mounting the potential resistor, the plurality of mounting parts are divided into two columns, the plurality of potential resistors are mounted between the two columns of mounting parts, and each mounting part is connected to at least one potential resistor.

7. The potential resistor fixing structure according to any one of claims 1 to 5, characterized in that: The potential resistor fixing structure further includes a support member arranged at the bottom of the fixing plate to form a support.

8. The potential resistor fixing structure according to claim 7, characterized in that: The support member includes a bottom frame, a vertical frame and a horizontal frame. The bottom frame is connected to the bottom support frame of the tap selector, the vertical frame is connected between the fixing plate and the bottom frame, and the horizontal frame is connected between the vertical frame and the side frame of the tap selector.

9. An on-load tap changer, characterized in that: The invention comprises a tap selector, a changeover switch, a plurality of potential resistors and a potential resistor fixing structure according to any one of claims 1 to 8.

10. An on-load tap-changing transformer, characterized in that: The invention comprises the on-load tap changer according to claim 9.

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