Resistance module for on-load tap changer, on-load tap changer and transformer

Abstract

The utility model relates to a resistance module for on-load tap changer, wherein the resistance module comprises: one or more resistance units, each resistance unit comprises a plate-like support and a resistance wire wound on the support, and the plurality of resistance units can be electrically connected with each other;A housing, the housing comprises a first housing half and a second housing half, the first housing half and the second housing half define a housing interior space, the one or more resistance units are detachably accommodated in the housing interior space, an opening is formed between the first housing half and the second housing half, which communicates the housing interior space and the housing exterior, and fluid can pass through the opening to enter and exit the housing interior space. The utility model also relates to an on-load tap changer and a transformer.

Description

Technical Field

[0001] This utility model relates to a resistor module for an on-load tap changer, an on-load tap changer, and a transformer. Background Technology

[0002] An on-load tap-change (OLTC) for a transformer is a key piece of equipment. Its core function is to dynamically change the turns ratio of the windings when the transformer is operating under load, thereby achieving stable regulation of the output voltage. An on-load tap-change typically includes a selector, a switching switch, and a drive mechanism. The design of the on-load tap-change must be able to complete the tap switching under load conditions and ensure the continuity of the load current and the safe and reliable operation of the system during the switching process.

[0003] The core challenge in the operation of a switching switch lies in how to safely and reliably disconnect the load current of the current tap and transfer the current to the new tap. To address this, one approach is to use a resistor to limit the circulating current generated during switching due to bridging the two taps. Specifically, at the moment of switching, the movable contact briefly connects both taps simultaneously. At this time, a resistor is connected in series to suppress short-circuit current and prevent contact burn-out. This resistor is also known as a transition resistor.

[0004] In existing technology, resistors, or transition resistors, used in on-load tap changers are typically constructed from resistance wires wound around an insulated rod-shaped substrate, which are bulky and space-consuming. To generate larger resistance values, multiple rod-shaped resistors are connected in series and threaded tightly into a frame, further exacerbating the inefficient use of space in the on-load tap changer or transformer. Moreover, individual repair and replacement are difficult in the event of a fault or damage.

[0005] As a crucial component for the functionality and reliability of on-load tap changers, it is desirable that the transition resistors of on-load tap changers be modularly manufactured, assembled, and easily installed and replaced, while ensuring protection of the transition resistors and their functional reliability. Utility Model Content

[0006] The objective of this invention is to provide a resistor module for an on-load tap changer, an on-load tap changer, and a transformer, which overcome at least one defect in the prior art.

[0007] The task is accomplished by a resistor module for an on-load tap changer according to the present invention, an on-load tap changer according to the present invention, and a transformer according to the present invention.

[0008] The first aspect of this utility model relates to a resistor module for an on-load tap changer, wherein the resistor module comprises: one or more resistor units, each resistor unit comprising a plate-shaped support and a resistance wire wound on the support, the plurality of resistor units being electrically connected to each other; and a housing comprising a first housing half and a second housing half, the first housing half and the second housing half defining an internal space of the housing, the one or more resistor units being detachably housed in the internal space of the housing, and an opening being formed between the first housing half and the second housing half communicating with the internal space of the housing and the outside of the housing, through which fluid can enter and exit the internal space of the housing.

[0009] In the resistor module for on-load tap changers according to this invention, on the one hand, one or more resistor units can be detachably housed in a common housing and form an integral assembly, thereby enabling the entire resistor module to be easily installed onto the corresponding carrier in the on-load tap changer, such as the substrate of the switching switch. This facilitates the overall installation of the resistor module and its replacement when necessary. Furthermore, the plate-like support allows the resistor module to be constructed in a compact manner with minimal space requirements. On the other hand, the opening formed between the first and second housing halves of the resistor module allows fluid, such as insulating oil, to pass through the opening into and out of the housing without any problems. The protection and cooling of the resistor units, particularly their resistance wires and other energized components, can be achieved via this fluid, contributing to the reliable functionality of the on-load tap changer and ensuring the stable operation of equipment including the on-load tap changer, such as transformers.

[0010] Meanwhile, this utility model proposes a modular manufacturing concept for resistor modules used in on-load tap changers. The number and specifications of resistor units in the resistor module housing can be determined according to the needs of the corresponding on-load tap changer. Moreover, individual resistor units can be easily replaced in case of failure.

[0011] According to one embodiment of the present invention, mounting grooves for resistor units are constructed on two opposing inner sidewalls of the first housing half, and the two opposing end sides of the resistor unit bracket are respectively placed into and held in a corresponding mounting groove.

[0012] According to one embodiment of the present invention, a wedge-shaped protrusion is constructed in the mounting groove, and a wedge-shaped recess is constructed on the end side of the support of the resistor unit to match the wedge-shaped protrusion. When the resistor unit is placed in the mounting groove, the wedge-shaped protrusion is embedded in the wedge-shaped recess.

[0013] According to one embodiment of the present invention, the plurality of resistor units are arranged side by side, and adjacent resistor units are connected in series with each other via electrical connecting pieces.

[0014] According to one embodiment of the present invention, the resistor module includes a first terminal and a second terminal for electrical connection with an external circuit. The first terminal is connected to the first resistor unit in a plurality of resistor units connected in series with each other, and the second terminal is connected to the last resistor unit in a plurality of resistor units connected in series with each other.

[0015] According to one embodiment of the present invention, the bottom of the first housing half is provided with a hole for the first terminal to pass through, and the side wall of the first housing half is provided with a clearance for the second terminal to pass through.

[0016] According to one embodiment of the present invention, each resistor unit includes two electrical contact pieces, which are respectively electrically connected to one end of a resistance wire, and the support structure of the resistor unit has grooves for fixing the electrical contact pieces.

[0017] According to one embodiment of the present invention, the second housing half is connected to the first housing half by a snap-fit ​​structure. The snap-fit ​​structure includes a snap-fit ​​hook and a snap-fit ​​surface that are disposed on each other. The snap-fit ​​hook is disposed on one of the first housing half and the second housing half, and the snap-fit ​​surface is disposed on the other of the first housing half and the second housing half.

[0018] According to one embodiment of the present invention, a plurality of snap rings, preferably a plurality of snap rings extending laterally, are provided on the outer side wall of the first housing half, and the second housing half includes a plurality of corresponding snap legs extending toward the first housing half and cooperating with the plurality of snap rings. The snap hooks are provided at the ends of the snap legs. When the snap legs are inserted into the corresponding snap rings, the snap hooks are hooked back onto the snap surface of the snap rings that is away from the second housing half.

[0019] According to one embodiment of the present invention, a stepped portion is constructed on the side edge of the snap-fit ​​leg. When the snap-fit ​​leg is inserted into the corresponding snap-fit ​​ring, the stepped portion abuts against the end face of the snap-fit ​​ring facing the second housing half.

[0020] According to one embodiment of the present invention, the second housing half is constructed of a conductive material and forms an electrical shield for the resistor unit.

[0021] According to one embodiment of this utility model, the resistor module is used as a transition resistor for an on-load tap changer.

[0022] The second aspect of this utility model relates to an on-load tap changer, wherein the on-load tap changer includes a selector and a switching switch, and the switching switch includes a resistor module for an on-load tap changer according to the first aspect of this utility model.

[0023] According to one embodiment of the present invention, the resistor module is mounted on the substrate of the switching switch via a threaded connection structure.

[0024] The third aspect of this utility model relates to a transformer, wherein the transformer includes a transformer housing and an on-load tap changer according to the second aspect of this utility model, the on-load tap changer being at least partially disposed in the transformer housing, and the fluid being oil filling the transformer housing.

[0025] It should be noted that aspects of the present invention described with respect to one embodiment can be included in other different embodiments, although these other different embodiments are not specifically described. In other words, features of all embodiments and / or any embodiments can be combined in any manner and / or combination, as long as they do not contradict each other. Attached Figure Description

[0026] A better understanding of various aspects of this utility model will be achieved by reading the following detailed description in conjunction with the accompanying drawings, in which:

[0027] Figure 1 A resistor module for an on-load tap changer according to one embodiment of the present invention is schematically shown mounted on a carrier.

[0028] Figure 2 schematically shown Figure 1 Bottom view of the resistor module in the image;

[0029] Figure 3 schematically shown Figure 1 A resistor unit in the resistor module;

[0030] Figure 4 schematically shown Figure 1 The first housing half of the resistor module and a resistor unit housed in the first housing half;

[0031] Figure 5 schematically shown Figure 1 The first housing half of the resistor module and one or more resistor units housed in the first housing half;

[0032] Figure 6 and Figure 7 Suggested from different perspectives Figure 1 The second housing half of the resistor module in the middle;

[0033] Figure 8 schematically shown Figure 1 The resistor module in the assembly state includes the second housing half and the first housing half. Detailed Implementation

[0034] The present invention will now be described with reference to the accompanying drawings, which illustrate several embodiments of the present invention. However, it should be understood that the present invention can be presented in many different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure of the present invention more complete and to fully illustrate the scope of protection of the present invention to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide more additional embodiments.

[0035] It should be understood that the terminology used in this specification is for describing specific embodiments only and is not intended to limit the scope of this invention. All terms used in this specification (including technical and scientific terms) have the meanings commonly understood by those skilled in the art unless otherwise defined. For the sake of brevity and / or clarity, well-known functions or structures may not be described in detail.

[0036] Unless otherwise specified, the singular forms “a,” “the,” and “the” used in this specification include the plural forms. The terms “comprising,” “including,” and “containing” used in this specification indicate the presence of the claimed feature but do not exclude the presence of one or more other features. The term “and / or” used in this specification includes any and all combinations of one or more of the relevant listed items.

[0037] When a component is described in the specification as being "on", "attached" to, "connected" to, "joined" to, or "in contact" with another component, the component may be directly located on, attached to, connected to, joined to, or in contact with the other component, or there may be an intermediate component present.

[0038] In this specification, the terms "first," "second," "third," etc., are used for ease of explanation only and are not intended to be limiting. Any technical feature represented by "first," "second," "third," etc., is interchangeable.

[0039] In the specification, spatial relation terms such as "above," "below," "front," "back," "top," and "bottom" describe the relationship between one feature and another in the accompanying drawings. It should be understood that spatial relation terms include not only the orientation shown in the drawings but also the different orientations of the device during use or operation. For example, when the device in the drawings is inverted, a feature previously described as "below" other features can now be described as "above" other features. The device can also be oriented in other ways (rotated 90 degrees or in other orientations), in which case the relative spatial relationships will be explained accordingly.

[0040] Figure 1 and Figure 2 A resistor module 1 for an on-load tap changer according to one embodiment of the present invention is schematically shown. The resistor module 1 includes one or more resistor units 2 (see...). Figure 3 The resistor unit 2 includes a plate-shaped support 21 and a resistance wire 22 wound on the support. Multiple resistor units 2 can be electrically connected to each other. The resistor module 1 also includes a housing 3, which includes a first housing half 4 and a second housing half 5, defining an internal space within the housing, in which the one or more resistor units 2 are detachably housed. An opening 6 is formed between the first housing half 4 and the second housing half 5, communicating between the internal space and the outside of the housing, allowing fluid to enter and exit the internal space.

[0041] like Figure 1 As shown, the resistor module 1 can be conveniently mounted as a single unit onto a corresponding carrier in an on-load tap changer, such as the substrate 100 of the switching switch. This modular configuration of the resistor module 1 allows for simple manufacturing, assembly, and convenient installation in the on-load tap changer. For example, the resistor module 1 can be mounted onto the substrate 100 of the switching switch via a threaded connection structure, such as bolts. In some embodiments, such as Figure 2 As shown, the bottom 45 of the first housing half 4 may be provided with at least one, here two, positioning pins 41 and at least one, here two, locking legs 42. The positioning pins 41 and locking legs 42 may be distributed in a suitable manner on the bottom 45 of the first housing half 4. The positioning pins 41 and locking legs 42 may respectively cooperate with corresponding positioning structures on the corresponding carrier in the tap changer, such as the substrate 100 of the switching switch, to define the position of the resistor module 1 on the carrier, such as the substrate 100, and to detachably fix the resistor module 1 to the carrier, such as the substrate 100.

[0042] In some embodiments, the on-load tap changer including the resistor module 1 can be at least partially disposed within the transformer housing as part of the transformer. The transformer housing can be filled with an insulating fluid, such as an insulating liquid or insulating gas, particularly insulating oil. During the switching of the on-load tap changer, the resistance wire 22 may briefly carry current, generating a significant amount of heat. The insulating oil, which can pass through the opening 6 of the resistor module 1 into and out of the housing, absorbs and carries away this heat, preventing the resistance wire 22 from overheating. Furthermore, the insulating oil extinguishes any arcing that may occur, protecting the contacts from damage; additionally, the insulating oil itself provides the necessary insulating barrier to ensure electrical insulation between the resistance wire and other energized components. Therefore, the opening formed between the first housing half 4 and the second housing half 5 advantageously ensures the safe and reliable operation of the on-load tap changer and the entire transformer. In some embodiments, such as Figure 2 As can be most clearly seen, the bottom plate of the first housing half 4 may also have at least one, preferably multiple, through openings 61. Fluid can also enter and exit the interior space of the housing through the through openings 61. Alternatively or additionally, the through openings 61 may also be provided on the side wall of the first housing half 4.

[0043] In some embodiments, such as Figure 1 and Figure 2 As shown, the first housing half 4 can be substantially in the shape of an open box, while the second housing half 5 can be substantially in the shape of a lid. Figure 3 As shown, the plate-like support 21 of the resistor unit 2 can have a substantially rectangular shape. The resistance wire 22 can extend substantially parallel to the short side 211 of the support 21 and be wound around the support 21, so that the long side 212 of the support 21 can be surrounded and covered by the resistance wire 22 in most areas. The length of the long side 212 of the support 21 can be matched to the dimensions of the first housing half 4, particularly the length of the first sidewall 43, so that the resistor unit 2 can be arranged substantially parallel to the first sidewall 43 in the first housing half 4, and the two end sides (here, the short side 211) of the support 21 of the resistor unit 2 can be fixed to the second sidewall 44 of the first housing half 4, as shown. Figure 4 and Figure 5 As shown. In Figure 5 In this case, multiple (in this case, five) resistor units 2 can be arranged side by side along the second sidewall 44 at a distance from each other.

[0044] like Figure 4As shown, in order to fix the resistor unit 2 relative to the first housing half 4, mounting slots 441 for the resistor unit 2 can be constructed on the two opposing inner sidewalls (here, the second sidewall 44) of the first housing half 4. The two opposing end sides (here, the short side 211) of the support 21 of the resistor unit 2 can be respectively inserted into and held in a corresponding mounting slot 441. The mounting slot 441 can have a widened inlet 440, thereby allowing the resistor unit 2 to be easily slid into the mounting slot 441 along the insertion direction R1. Here, the insertion direction R1 points from the open opening of the first housing half 4 to the bottom 45 of the first housing half.

[0045] In some embodiments, a wedge-shaped protrusion 442 may be constructed in the mounting groove 441. Figure 4 In the illustrated embodiment, the wedge-shaped protrusion 442 can be located at the bottom of the mounting groove 441, and the wedge-shaped surface 443 of the wedge-shaped protrusion 442 can gradually rise along the insertion direction R1 of the resistor unit 2. Furthermore, as... Figure 3 As shown, a wedge-shaped recess 24, which mates with the wedge-shaped protrusion 442, can be constructed on the short side 211 of the support 21 of the resistor unit 2. When the resistor unit 2 is placed in the mounting groove 441, the wedge-shaped protrusion 442 can be fitted into the wedge-shaped recess 24. Through the cooperation between the wedge-shaped protrusion 442 and the wedge-shaped recess 24, it is possible to prevent the resistor unit 2 from undesirably sliding out of the first housing half 4 in a direction opposite to the insertion direction R1. Figure 3 As can be clearly seen, two mirror-symmetrical wedge-shaped recesses 24 can be constructed on one short side 211 of the bracket 21, thereby facilitating the installation of the resistor unit 2 without needing to determine the specific installation orientation of the resistor unit 2. Alternatively or additionally, the wedge-shaped protrusion 442 can also be located on the groove wall of the mounting groove 441, and correspondingly, the wedge-shaped recess 24 can be located on the flat main surface 25 of the bracket 21.

[0046] By providing the holding and positioning structures for the resistor unit 2 (such as mounting groove 441, wedge protrusion 442, etc.) on the side wall of the first housing half 4, the bottom 45 area of ​​the first housing half 4 can be advantageously left empty for setting, for example, a through opening 61. This facilitates the flow of fluid in the housing 3, thereby improving the cooling effect on the resistor unit 2.

[0047] In some embodiments, such as Figure 5 As shown, adjacent resistor units 2 can be connected in series with each other via electrical connecting pieces 7. To facilitate the electrical connection of resistor units 2, as follows... Figure 3 As shown, the resistor unit 2 may include electrical contact pieces 26 that are electrically connected to one end of the resistance wire 22. Figure 3In the middle, the upper electrical contact 26 is electrically connected to one end of the resistance wire 22, while the lower electrical contact 26 is electrically connected to the other end of the resistance wire 22. The electrical contact 26 can have a larger area than the end of the resistance wire 22, thereby facilitating the connection of the resistance wire 22 to other devices, such as the electrical connection piece 7 or the terminal 8 (see...). Figure 5 The electrical connection is as follows: The bracket 21 may be configured with slots 27 for securing the electrical contact piece 26. Figure 3 In the illustrated embodiment, slots 27 can be respectively provided in the end-side regions of the support 21 that are not wound with the resistance wire 22, and two slots 27 can be provided in one end-side region. Here, the slots 27 can extend substantially perpendicular to the resistance wire 22. Flat electrical contact pieces 26 can be inserted into these two slots 27 and fixed to the support 21. In particular, the electrical contact pieces 26 can be inserted in different ways in the two end-side regions of the same resistor unit 2, so as to facilitate the series connection of different resistor units 2 in the housing by back-to-back arrangement.

[0048] To achieve electrical connection between resistor module 1 and external circuitry, in some embodiments, such as... Figure 5 As shown, resistor module 1 may include a first terminal ( Figure 5 (not visible in the middle) and the second terminal 81. The first terminal can be connected to... Figure 5 The first resistor unit 201 located on the far left, particularly its electrical contact piece 26, and the second terminal 81 can be connected to Figure 5 The last resistor unit 202, located on the far right, particularly its electrical contact piece 26. Figure 5 In the illustrated embodiment, the second terminal 81 may include an electrical contact ring 82 and a wire 83 including a connection between the electrical contact ring 82 and a corresponding electrical contact piece 26. One end of the wire 83 may be stripped to expose its conductor 84, which may be connected to each other, for example, by soldering, the electrical contact piece 26 of the last resistor unit 202. Figure 5 The first terminal, which is not visible in the middle, can also be constructed similarly to the second terminal 81.

[0049] In order to lead the corresponding terminals out from the housing 3 of the resistor module 1, in some embodiments, such as Figure 2 and Figure 4 As shown, the bottom 45 of the first housing half 4 may be configured with a hole 46 for the first terminal (electrically connected to the first resistor unit 201) to pass through. Furthermore, as... Figure 4 and Figure 5 As shown, the clearance 47 for the passage of the second terminal 81 (electrically connected to the last resistor unit 202) can be constructed on the first sidewall 43 of the first housing half 4 near the last resistor unit 202.

[0050] In some embodiments, the resistor module 1 may be electrically connected via a first terminal and a second terminal, for example, to a corresponding component of an on-load tap changer selector and / or a switching switch, to be used, for example, as a transition resistor for an on-load tap changer.

[0051] Figure 6 and Figure 7 The second housing half 5 of the resistor module 1 is shown separately from different perspectives according to some embodiments. The second housing half 5 may here have a cover-like body 50. (See also...) Figure 1 As can be most clearly seen, when the second housing half 5 is mounted on the first housing half 4, the second housing half 5 can completely cover the open opening of the first housing half 4 and thus completely cover the resistor unit 2 located in the first housing half. In some embodiments, the second housing half 5 can be constructed of a conductive material and constitute an electrical shield for the resistor unit 2. The conductive material can be a metal, such as copper. The first housing half 4 can be made of an insulating material, such as plastic.

[0052] In some embodiments, such as Figure 2 As shown, the second housing half 5 can be connected to the first housing half 4 via a snap-fit ​​structure 9. The snap-fit ​​structure 9 may include snap hooks 91 and snap faces 92 that are matched with each other. Through the mutual engagement of the snap hooks 91 and snap faces 92, the second housing half 5 and the first housing half 4 can be locked together. The snap hook 91 may be located on one of the second housing half 5 and the first housing half 4, while the snap face 92 may be located on the other of the second housing half 5 and the first housing half 4.

[0053] Specifically, in some embodiments, such as Figure 4 and Figure 8 As shown, a plurality of snap-fit ​​rings 93, preferably extending laterally from the respective outer sidewalls, can be constructed on the outer sidewalls (here, the two first sidewalls 43) of the first housing half 4. Here, two snap-fit ​​rings 93 can be constructed on each of the two first sidewalls 43, resulting in a total of four snap-fit ​​rings 93. Furthermore, as... Figures 6 to 8 As shown, the second housing half 5 may have four latching legs 94 extending from the main body 50 toward the first housing half 4. These four latching legs 94 may be respectively engaged with the four latching rings 93 of the first housing half 4. A latching hook 91 may be provided at the end of each latching leg 94. Figure 2 As can be seen most clearly, when the second housing half 5 is installed onto the first housing half 4, the snap-fit ​​leg 94 can be inserted into the corresponding snap-fit ​​ring 93, and the snap-fit ​​hook 91 can be hooked back onto the snap-fit ​​surface 92 of the corresponding snap-fit ​​ring 93 that is away from the second housing half 5, so as to prevent the snap-fit ​​leg 94 from disengaging from the snap-fit ​​ring 93.

[0054] To define the relative positions of the first housing half 4 and the second housing half 5, in some embodiments, such as Figures 6 to 8 As shown, a stepped portion 95 can be constructed on the snap-fit ​​leg 94 of the second housing half 5, particularly on the side edge of the snap-fit ​​leg 94. When the snap-fit ​​leg 94 is inserted into the corresponding snap-fit ​​ring 93, the stepped portion 95 can abut against the end face 96 of the snap-fit ​​ring 93 facing the second housing half 5, thereby defining the relative position of the second housing half 5 and the first housing half 4, particularly the resistor unit 2 held in the first housing half 4, and in particular, making the second housing half 5 (constructed of conductive material) spaced apart from the resistor unit 2 held in the first housing half 4 by a distance.

[0055] In some embodiments, such as Figure 4 As can be most clearly seen, an introduction ramp 97 can also be provided in the snap ring 93 of the first housing half 4, so that the snap leg 94 of the second housing half 5 can be easily introduced into the snap ring 93. In addition, the introduction ramp 97 can be constructed, for example, on the elastic tongue 98, which can abut against the snap leg 94 when the snap leg 94 is inserted into the snap ring 93, to ensure that the snap hook 91 hooks back into the snap ring 93.

[0056] like Figure 8 As shown, by means of an embodiment of the present invention, a large opening 6 for fluid to pass through can be formed between the edges of the first housing half 4 and the second housing half 5 to ensure the cooling effect on the resistor unit 2. Furthermore, at least a portion of the sidewall of the first housing half 4, such as at least a portion 430 of the first sidewall 43, can have a lower height (e.g., relative to the second sidewall 44), or a suitable opening can be provided on the first sidewall 43 to further enlarge the size of the opening 6.

[0057] Embodiments of this utility model also relate to an on-load tap changer (not shown), which may include a selector and a switching switch. The switching switch may include the resistor module 1 for on-load tap changing described above. In some embodiments, the switching switch may have a substrate 100, and the resistor module 1 may be mounted on the substrate 100, for example, via a threaded connection structure, as shown in reference to... Figure 1 .

[0058] Furthermore, embodiments of this utility model also relate to a transformer (not shown), which may include a transformer housing and the on-load tap changer described above. The on-load tap changer may be at least partially disposed within the transformer housing, and the fluid may be an insulating fluid, such as insulating oil, that fills the transformer housing.

[0059] Exemplary embodiments of the present invention have been described above with reference to the accompanying drawings. However, those skilled in the art will understand that various changes and modifications can be made to the exemplary embodiments of the present invention without departing from the spirit and scope of this disclosure. All changes and modifications are included within the scope of protection of the present invention as defined by the claims. The present invention is defined by the appended claims, and equivalents of those claims are also included.

Claims

1. A resistor module for on-load tap changers, characterized in that, The resistor module (1) includes: One or more resistor units (2), each resistor unit including a plate-shaped support (21) and a resistance wire (22) wound on the support, the plurality of resistor units being electrically connected to each other; The housing (3) includes a first housing half (4) and a second housing half (5), the first housing half and the second housing half defining an internal space of the housing, the one or more resistor units being detachably housed in the internal space of the housing, and an opening (6) being formed between the first housing half and the second housing half to communicate between the internal space of the housing and the outside of the housing, through which fluid can enter and exit the internal space of the housing.

2. The resistor module for on-load tap changer according to claim 1, characterized in that, Mounting slots (441) for resistor units are constructed on two opposing inner sidewalls of the first housing half, and the two opposing end sides of the resistor unit bracket are respectively placed into and held in a corresponding mounting slot.

3. The resistor module for on-load tap changer according to claim 2, characterized in that, A wedge-shaped protrusion (442) is constructed in the mounting groove, and a wedge-shaped recess (24) that matches the wedge-shaped protrusion is constructed on the end side of the support of the resistor unit. When the resistor unit is placed in the mounting groove, the wedge-shaped protrusion is embedded in the wedge-shaped recess.

4. The resistor module for an on-load tap changer according to any one of claims 1 to 3, characterized in that, The plurality of resistor units are arranged side by side, and adjacent resistor units are connected in series with each other via electrical connecting pieces (7).

5. The resistor module for on-load tap changer according to claim 4, characterized in that, The resistor module includes a first terminal and a second terminal (81) for electrical connection to an external circuit. The first terminal is connected to the first resistor unit (201) of the plurality of resistor units connected in series with each other, and the second terminal is connected to the last resistor unit (202) of the plurality of resistor units connected in series with each other.

6. The resistor module for on-load tap changer according to claim 5, characterized in that, The bottom (45) of the first housing half is provided with a hole (46) for the first terminal to pass through, and the side wall of the first housing half is provided with a clearance (47) for the second terminal to pass through.

7. The resistor module for an on-load tap changer according to any one of claims 1 to 3, characterized in that, Each resistor unit includes two electrical contacts (26), which are electrically connected to one end of a resistance wire, and the support of the resistor unit is provided with slots (27) for fixing the electrical contacts.

8. The resistor module for an on-load tap changer according to any one of claims 1 to 3, characterized in that, The second housing half is connected to the first housing half by a snap-fit ​​structure (9). The snap-fit ​​structure includes a snap-fit ​​hook (91) and a snap-fit ​​surface (92) that are matched with each other. The snap-fit ​​hook is disposed on one of the first housing half and the second housing half, and the snap-fit ​​surface is disposed on the other of the first housing half and the second housing half.

9. The resistor module for on-load tap changer according to claim 8, characterized in that, Multiple snap rings (93) are provided on the outer side wall of the first housing half, and the second housing half includes multiple snap legs (94) extending toward the first housing half and cooperating with the multiple snap rings. The snap hooks are provided at the ends of the snap legs. When the snap legs are inserted into the corresponding snap rings, the snap hooks are hooked back onto the snap surface of the snap rings that is away from the second housing half.

10. The resistor module for on-load tap changer according to claim 9, characterized in that, A stepped portion (95) is constructed on the side edge of the snap-fit ​​leg, and when the snap-fit ​​leg is inserted into the corresponding snap-fit ​​ring, the stepped portion abuts against the end face (96) of the snap-fit ​​ring facing the second housing half.

11. The resistor module for an on-load tap changer according to any one of claims 1 to 3, characterized in that, The second housing half is constructed of conductive material and forms an electrical shield for the resistor unit.

12. The resistor module for an on-load tap changer according to any one of claims 1 to 3, characterized in that, The resistor module is used as a transition resistor for an on-load tap changer.

13. An on-load tap changer, characterized in that, The on-load tap changer includes a selector and a switching switch, the switching switch including a resistor module for an on-load tap changer according to any one of claims 1 to 12.

14. The on-load tap changer according to claim 13, characterized in that, The resistor module is mounted on the substrate (100) of the switching switch via a threaded connection structure.

15. A transformer, characterized in that, The transformer includes a transformer housing and an on-load tap changer according to claim 13 or 14, the on-load tap changer being at least partially disposed in the transformer housing, and the fluid being oil filling the transformer housing.

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