Contact-making system for a switching switch of a load tap changer, switching switch for a load tap changer, load tap changer and transformer

Abstract

The utility model relates to a contact making system for a switching switch of a load tap changer, wherein the contact making system is configured for mounting on a base plate of the load tap changer, the contact making system comprises a first contact, a second contact and a bridge contact, wherein: the bridge contact is configured to be movable relative to the base plate in order to be in electrical contact with the first contact and / or the second contact; and the first contact and the second contact are each mounted floating on the base plate via a pre-tensioning element, the pre-tensioning element is configured for biasing the respective first contact and second contact in the direction of the bridge contact and pressing the respective first contact or second contact against the bridge contact in the event of electrical contact between the respective first contact or second contact and the bridge contact. The utility model further relates to a switching switch for a load tap changer, a load tap changer and a transformer.

Description

Technical Field

[0001] This application relates to a contact connection system for a switching switch used in an on-load tap changer, a switching switch used in 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 operating a changeover switch lies in safely and reliably disconnecting the load current at the current tap and transferring it to the new tap. During switching, a bridging switch can be used, for example, to temporarily bridge the two selector arms, providing a continuous transition path for the load current and preventing current interruption. In this process, it is necessary to ensure reliable contact between the corresponding contacts while simultaneously avoiding excessive wear caused by excessive contact pressure.

[0004] Currently, it is known in existing technology that bridge contacts in contact connection systems are manufactured using elastic sheet metal. However, in on-load tap changers, bridge contacts are themselves high-load and high-wear components, requiring not only to achieve contact connection but also to provide the desired contact pressure. During switching, bridge contacts must withstand current and temperature fluctuations caused by contact switching, as well as mechanical losses due to elastic deformation and mechanical contact. Under frequent switching operations, the elastic sheet metal is prone to material fatigue or performance degradation, making it difficult to maintain stable and reliable contact performance throughout the entire service life of the on-load tap changer. Utility Model Content

[0005] The objective of this invention is to provide a contact connection system for a switching switch for an on-load tap changer, a switching switch for an on-load tap changer, an on-load tap changer, and a transformer, which can overcome at least one defect in the prior art.

[0006] The task is accomplished by a contact connection system for a switching switch for an on-load tap changer according to the present invention, a switching switch 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.

[0007] The first aspect of this utility model relates to a contact connection system for a switching switch used in an on-load tap changer, wherein the contact connection system is configured for mounting on a substrate of the on-load tap changer, the contact connection system including a first contact, a second contact, and a bridge contact, wherein: the bridge contact is configured to move relative to the substrate to make electrical contact with the first contact and / or the second contact; and the first contact and the second contact are respectively floatingly mounted on the substrate via preload members, the preload members being configured to bias the respective first contact and second contact toward the bridge contact, and to press the respective first contact or second contact against the bridge contact when the respective first contact or second contact makes electrical contact with the bridge contact.

[0008] In the contact connection system according to this utility model, by floating the first contact and the second contact on the substrate, both the first contact and the second contact can reliably make electrical contact with the bridge contact. Compared with the bridge contacts made of elastic plates known in the prior art, the first contact and / or the second contact can move independently in directions close to and away from the bridge contact, and there are no dimensional and shape fluctuations in the contact mating interface caused by the deformation of the elastic plate, resulting in stronger adaptability and stability.

[0009] Furthermore, in the contact connection system according to this utility model, by setting an independent pre-tightening member, the corresponding first and second contacts are pressed against the bridge contacts with a certain pressure to achieve reliable electrical contact between the corresponding first and second contacts and the bridge contacts. Here, by designing the structure that realizes the electrical contact function (first contact, second contact, and bridge contact) and the structure that realizes the pre-tightening function (pre-tightening member) separately, it is not only easier to troubleshoot, but also easier to replace relevant components when necessary, thus benefiting the later maintenance of the on-load tap changer. In particular, under frequent switching operations, if material fatigue or performance degradation of the pre-tightening member occurs, only the pre-tightening member can be replaced, which helps to save material costs and simplify maintenance operations.

[0010] According to one embodiment of the present invention, the pre-tightening member is configured as an elastic member. When the corresponding first contact or second contact is in electrical contact with the bridge contact, the elastic member is compressed and presses the corresponding first contact or second contact against the bridge contact.

[0011] According to one embodiment of the present invention, the first contact and / or the second contact have a flange for the pretensioner, the pretensioner being supported between the flange and the substrate.

[0012] According to one embodiment of the present invention, a guide post for the preload is constructed on the side of the flange away from the bridge contact.

[0013] According to one embodiment of the present invention, the guide post is configured to extend from the side of the substrate facing the bridge contact through the substrate to the side of the substrate away from the bridge contact and form a terminal for electrical connection with an external circuit.

[0014] According to one embodiment of the present invention, the ends of the first contact and / or the second contact facing the bridge contact are configured as spherical crown-shaped contact portions.

[0015] According to one embodiment of the present invention, the bridge contact has an elongated contact surface capable of bridging the first contact and the second contact, and inclined guide ramps are respectively constructed at both ends of the contact surface.

[0016] According to one embodiment of the present invention, the contact connection system includes a carrier plate for the bridge contact, the bridge contact being fixed on the carrier plate, and the contact connection system includes a guide structure for the carrier plate, the carrier plate being able to be held in the guide structure and being able to move along the guide structure.

[0017] According to one embodiment of the present invention, the guiding structure and the substrate are constructed as a single piece.

[0018] According to one embodiment of the present invention, the carrier plate is configured to move relative to the substrate at least between a first position, a second position, and a third position. In the first position, the bridge contact is in electrical contact with the first contact; in the second position, the bridge contact is in electrical contact with the first contact and the second contact; and in the third position, the bridge contact is in electrical contact with the second contact.

[0019] According to one embodiment of the present invention, a wiring portion for electrical connection with an external circuit is constructed on the side of the bridge contact opposite to the first contact and the second contact.

[0020] According to one embodiment of the present invention, the bridge contact is fixed on the side of the carrier plate facing the first contact and the second contact, wherein the wiring portion of the bridge contact passes through the carrier plate and extends from the side of the carrier plate opposite to the first contact and the second contact.

[0021] According to one embodiment of the present invention, the first contact is configured to be electrically connected to the moving contact of the vacuum switch tube of the switching switch, the second contact is configured to be electrically connected to the fixed contact of the vacuum switch tube, and the bridge contact is configured to be electrically connected to the load lead of the on-load tap changer.

[0022] The second aspect of this utility model relates to a switching switch for an on-load tap changer, wherein the switching switch includes a contact connection system for an on-load tap changer according to the first aspect of this utility model and a drive mechanism for driving the bridge contacts to move.

[0023] The third aspect of this utility model relates to an on-load tap changer, the on-load tap changer including a selector and a switching switch according to the second aspect of this utility model, wherein: the substrate is a substrate dedicated to the switching switch, and only the components of the switching switch are disposed on the substrate; or the substrate is a substrate shared by the selector and the switching switch, and the components of the selector and the switching switch are disposed on the substrate.

[0024] A fourth aspect of this utility model relates to a transformer, wherein the transformer includes an on-load tap changer as described in the third aspect of this utility model.

[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 schematic diagram of a contact connection system for an on-load tap changer according to one embodiment of the present invention is shown.

[0028] Figure 2 The schematic diagram illustrates a contact connection system for a switching switch for an on-load tap changer according to one embodiment of the present invention.

[0029] Figure 3 and Figure 4 schematically shown Figure 2 The contacts in the system connect the first contact, the second contact, and the bridge contact;

[0030] Figure 5A portion of a switching switch for an on-load tap changer is schematically shown according to one embodiment of the present invention.

[0031] Figure 6 The diagram schematically illustrates a contact connection system mounted on the substrate of an on-load tap changer according to one embodiment of the present invention, and a drive mechanism for driving the movement of bridge contacts.

[0032] Figure 7 A portion of the substrate of an on-load tap changer according to one embodiment of the present invention is shown schematically.

[0033] Figure 8 schematically shown Figure 6 The drive mechanism for driving the bridge contacts and the carrier plate for the bridge contacts;

[0034] Figure 9 schematically shown Figure 6 The contact connection system and the drive mechanism for driving the movement of the bridge contacts. Detailed Implementation

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] Figure 1 A schematic diagram of a contact-connecting system 100 for an on-load tap changer according to one embodiment of the present invention is shown. Figure 1 The contact connection system 100 includes a first contact 1, a second contact 2, and a bridge contact 3. The bridge contact 3 can be configured to move so as to make electrical contact with the first contact 1 and / or the second contact 3. In conjunction with the corresponding operation of other components of the on-load tap changer, the tap switching of the transformer under load can be achieved via the corresponding movement of the bridge contact 3 (and thus the corresponding electrical contact with the first contact 1 and / or the second contact 3). Figure 1 The diagram shows, from left to right, the electrical contacts of bridge contact 3 and first contact 1, bridge contact 3 and first contact 1 and second contact 2, and bridge contact 3 and second contact 2.

[0042] Figure 2This diagram schematically illustrates a contact connection system 100 for an on-load tap changer according to one embodiment of the present invention. Generally, an on-load tap changer may include a selector and a switching switch. If necessary, the on-load tap changer may additionally include a preselector, etc. The contact connection system 100 may be configured for mounting on a substrate 200 of the on-load tap changer. At least a portion of the components of the on-load tap changer may be disposed on the substrate 200. Here, the substrate 200 may be a substrate 200 dedicated to the switching switch of the on-load tap changer, with only the components of the switching switch disposed on the substrate 200. In other embodiments, the substrate 200 may be a substrate 200 shared by the selector and the switching switch (and, if necessary, a preselector), with components of the selector and the switching switch (and, if necessary, components of the preselector, etc.) disposed on the substrate 200.

[0043] Continue to refer to Figure 2 The contact connection system 100 may include a first contact 1, a second contact 2, and a bridge contact 3. The bridge contact 3 may be configured to move relative to the substrate 200 in order to make electrical contact with the first contact 1 and / or the second contact 2. For clarity, Figure 3 and Figure 4 Individual first contact 1, second contact 2, and bridge contact 3 are shown, while substrate 200 is not shown. From Figure 3 and Figure 4 The relative positional relationship between the first contact 1, the second contact 2, and the bridge contact 3 can be observed. In the embodiments shown in the figures, the bridge contact 3 can slide substantially linearly relative to the substrate 200 and relative to the first contact 1 and the second contact 2, so as to contact the first contact 1 and / or the second contact 2 respectively in different bridging positions, as can be seen, for example, by referring to Figure 1 In other embodiments not shown, the bridge contact 3 may be, for example, rotate relative to the substrate 200 and relative to the first contact 1 and the second contact 2.

[0044] like Figure 2 As shown, the first contact 1 and the second contact can be floatingly mounted on the substrate 200 via preload members 4. The preload members 4 can be configured to bias the corresponding first contact 1 and second contact 2 toward the bridge contact 3. The corresponding preload members 4 can be configured to press the corresponding first contact 1 or second contact 2 against the bridge contact 3 when the first contact 1 or second contact 2 it is associated with is in electrical contact with the bridge contact 3. Specifically, in Figure 2In the illustrated embodiment, a preload member 4 can be provided for both the first contact 1 and the second contact 2. The first contact 1 can be floatingly mounted on the substrate 200 via the preload member 4. The preload member 4 associated with the first contact 1 can be configured to bias the first contact 1 toward the bridge contact 3 and press the first contact 1 against the bridge contact 3 when the first contact 1 is in electrical contact with the bridge contact 3. Similarly, the second contact 2 can be floatingly mounted on the substrate 200 via the preload member 4 associated with it. The preload member 4 associated with the second contact 2 can be configured to bias the second contact 2 toward the bridge contact 3 and press the second contact 2 against the bridge contact 3 when the second contact 2 is in electrical contact with the bridge contact 3.

[0045] exist Figure 2 In the scenario shown, the first contact 1 has been pressed against the bridge contact 3 under a certain pressure by the preload 4 and has made electrical contact with the bridge contact 3. The second contact 2, however, has not yet made contact with the bridge contact 3. Therefore, the preload 4, which is matched with the second contact 2, can be in a basically free state, making the second contact 2 more outward than the first contact 1. Figure 2 It extends or is offset roughly to the left, towards bridge contact 3). For example, at bridge contact 3, it further extends... Figure 2 When the middle moves downward and acts on the second contact 2, the second contact 2 can be pushed inward to a certain extent by the bridge contact 3. Figure 2 The preload element 4 presses the first contact 1 (approximately to the right) against the bridge contact 3, allowing the second contact 2 to be pressed against it with a certain pressure and make electrical contact with the bridge contact 3. By setting the preload element 4, reliable electrical contact between the corresponding first contact 1 and second contact 2 and the bridge contact 3 can be achieved. Furthermore, unlike the prior art which uses elastic sheet metal to manufacture the contacts, this application achieves the preload function by setting an independent preload element 4. By designing the structures that achieve the electrical contact function (first contact 1, second contact 2, and bridge contact 3) separately from the structure that achieves the preload function (preload element 4), troubleshooting is not only easier, but also the replacement of relevant components when necessary, thus facilitating the later maintenance of the on-load tap changer. In particular, under frequent switching operations, if material fatigue or performance degradation occurs in the preload element 4, only the preload element 4 can be replaced, saving material costs and simplifying maintenance operations.

[0046] In some embodiments, the preload 4 can be configured as an elastic element. The elastic element can be, for example, a coil spring, a leaf spring, a wave spring, etc. In some cases, the elastic element can also be, for example, a rubber washer. When the corresponding first contact 1 or second contact 2 is in electrical contact with the bridge contact 3, the preload 4, configured as an elastic element, can be compressed and press the corresponding first contact 1 or second contact 2 against the bridge contact 3.

[0047] In some embodiments, such as Figures 2 to 4 As shown, the first contact 1 and / or the second contact 2 (here, first contact 1 and second contact 2) equipped with the pretensioner 4 can be configured with a flange 50 for the pretensioner 4 to provide a support surface for the pretensioner 4, for example, configured as a helical spring. The corresponding pretensioner 4 can be supported between the flange 50 and the substrate 200. Furthermore, as... Figure 3 and Figure 4 As shown, a guide post 51 for a corresponding preload 4 can be constructed on the side of the flange 50 opposite to the bridge contact 3. The corresponding preload 4 can be fitted onto the guide post 51. To mount and hold the first contact 1 and the second contact 2 on the substrate 200, as... Figure 2 As shown, a receiving portion, here a stepped hole 201, for accommodating a corresponding first contact 1 or second contact 2 can be constructed on the substrate 200. The first contact 1 and the second contact 2 can pass through the stepped hole 201 of the substrate 200 from the side of the substrate 200 facing the bridge contact 3 with their guide posts 51. On the side of the substrate 200 away from the bridge contact 3, an enlarged diameter fixing member 52, such as a nut, can be installed on the guide post 51 to prevent the corresponding first contact 1 or second contact 2 from disengaging from the stepped hole 201. The stepped hole 201 may include a first stepped surface 202 for the flange 50. By the flange 20 abutting against the first stepped surface 202, the maximum compression degree of the preload 4 can be defined, and thus the extreme position of the corresponding first contact 1 or second contact 2 in the direction away from the bridge contact 3 can be defined. In addition, the stepped hole 201 may include a second stepped surface 203 for the preload 4, and the preload 4 can be supported between the flange 50 and the second stepped surface 203.

[0048] In some embodiments, in order to achieve electrical connection between the corresponding first contact 1 or second contact 2 and an external circuit, the guide post 51 may, for example, form a terminal on the side of the substrate 200 opposite to the bridge contact 3 for electrical connection between the corresponding first contact 1 or second contact 2 and the external circuit. This can be illustrated, for example, by referring to the substrate 200, which is hidden for clarity. Figure 5 By placing the terminals that electrically connect the first contact 1 and the second contact 2 to the external circuit on the side opposite to the electrical contact areas of the bridge contact 3, wiring can be easily performed. In particular, it can advantageously reduce the mechanical interference of the bridge contact 3's movement on the terminals. Figure 5 As can be most clearly seen, the guide post 51 can constitute a terminal post, which can be mechanically and electrically connected to the connecting piece of an external circuit, for example, via a corresponding threaded connector 6. Therefore, as... Figure 3 As shown, the guide post 51 may include a threaded connection hole 53 for the threaded connector 6.

[0049] In some embodiments, such as Figure 3 and Figure 4 As shown, the ends of the first contact 1 and / or the second contact 2 (here, first contact 1 and second contact 2) facing the bridge contact 3 can be configured as spherical cap-shaped contact portions 54. When in contact with the bridge contact 3, the spherical cap-shaped contact portions 54 facilitate smooth sliding of the first contact 1 or the second contact 2 on the bridge contact 3 and help to compress the corresponding first contact 1 or second contact 2 in a direction away from the bridge contact 3, while avoiding jamming. Advantageously, the bridge contact 3 can have an elongated contact surface 31 capable of bridging the first contact 1 and the second contact 2. At both ends of the contact surface 31, guide ramps 32 can be constructed, sloping from a substantially flat area 33 of the contact surface 31, thereby achieving a continuous and smooth transition from the contact surface 31 to the two ends. When the corresponding first contact 1 or second contact 2 comes into contact with the bridge contact 3, the inclined guide ramp 32 also helps the corresponding first contact 1 or second contact 2 to move smoothly along the guide ramp 32 to the substantially flat area 33 of the contact surface 31 as the bridge contact 3 moves.

[0050] like Figure 2 , Figure 3 and Figure 5 As shown, the contact connection system 100 may include a carrier plate 7 for the bridge contacts 3, which can be fixed to the carrier plate 7. Figure 4 As shown, the bridge contact 3 can have a generally plate-shaped body 34, with a contact surface 31 located on the body. A wiring portion 35 for electrical connection to an external circuit can be constructed on the side of the body 34 opposite to the contact surface 31. The wiring portion 35 can be configured as a connecting piece, which can be mechanically and electrically connected to the connecting piece of an external circuit, for example via a corresponding connector 61, as can be seen in [reference needed]. Figure 6 .like Figure 8 As shown, the carrier plate 7 may include, for example, a clearance 71 for the wiring portion 35 of the bridge contact 3 to pass through. When the bridge contact 3 is fixed to the carrier plate 7, the side of the body 34 of the bridge contact 3 opposite to the contact surface 31 can rest against the side of the carrier plate 7 facing the first contact 1 and the second contact 2, and the wiring portion 35 can pass through the clearance 71 of the carrier plate 7 from this side and extend from the side of the carrier plate 7 away from the first contact 1 and the second contact 2, as shown. Figure 9 As shown. By setting the wiring portion 35 of the bridge contact 3 on the side of the bridge contact 3 opposite to the contact surface 31, wiring can be easily carried out without hindering its movement or interfering with the contact with the first contact 1 and / or the second contact 2.

[0051] In some embodiments, the first contact 1 may be configured to interact with the vacuum switching tube 204 of the switching switch (see Figure 5One contact, such as a moving contact, is electrically connected to the vacuum switch tube 204, while the second contact 2 can be configured to be electrically connected to another contact, such as a fixed contact, of the vacuum switch tube 204. The bridge contact 3 can be configured to be electrically connected to the load lead of the on-load tap changer.

[0052] In order to achieve the desired movement of the bridge contact 3, in some embodiments, such as Figure 6 and Figure 7 As shown, the contact connection system 100 may further include a guide structure 8 for the bridge contacts 3, particularly for the carrier plate 7. The carrier plate 7 can be held on the substrate 200 via the guide structure 8 and can move along the guide structure 8. Figure 7 As can be most clearly seen, the guide structure 8 can have a shape similar to grippers. Exemplarily, four grippers are present, and a groove-shaped guide space 80 for the carrier plate 7 can be formed between each gripper. The grippers can act on the longitudinal side edges 72 of the carrier plate 7. Thus, the carrier plate 7 can be held between the grippers of the guide structure 8 and can move along the grippers. Figure 6 and Figure 7 Vertical movement within. In some embodiments, the guide structure 8 can be constructed as a single piece with the substrate 200, particularly integrally formed with the substrate 200, which can [allow movement in the vertical direction]. Figure 6 As can be seen from the area colored in red, it includes the substrate 200 and the guide structure 8 which is integral with the substrate 200.

[0053] In some embodiments, in order to drive the bridge contact 3, the on-load tap changer, particularly the on-load tap changer switching switch, may include a drive mechanism 300 for driving the movement of the bridge contact. For example... Figure 6 , Figure 8 and Figure 9 As shown, the drive mechanism 300 may include a first gear 301 rotatably supported on the substrate 200. A through hole 302 is formed on the first gear 301 for engaging with a drive shaft (not shown). The drive shaft (not shown) may extend through the substrate 200 and the first gear 301 and drive the first gear 301 to rotate. Furthermore, the drive mechanism 300 may include a second gear 303 meshing with the first gear 301 and a connecting rod 304 drively connected to the second gear 303. The connecting rod 304 may be hinged to the carrier plate 7. The carrier plate 7 can be driven via the drive shaft, through the first gear 301, the second gear 303, and the connecting rod 304. Here, the rotational motion of the drive shaft can be converted into linear motion of the carrier plate 7 and the bridge contact 3.

[0054] In some embodiments, to ensure reliable insulation between the various potentials of the contact connection system 100 and to prevent voltage arcing, the substrate 200 and the carrier plate 7 for the bridge contacts 3 may be made of insulating materials, such as plastic or fiber-reinforced plastic. The substrate 200 may not only be used to support and hold the various components of the contact connection system 100, but may also serve as an insulating medium between the various potentials of the contact connection system 100.

[0055] Embodiments of this utility model also relate to a switching switch for an on-load tap changer. The switching switch may include the contact connection system 100 described above and a drive mechanism 300 for driving the bridge contacts 3 to move.

[0056] Embodiments of this utility model also relate to an on-load tap changer (not shown), which may include a selector and the previously described switching switch. In some embodiments, the substrate 200 may be a substrate dedicated to the switching switch, and only the components of the switching switch (e.g., the contact connection system 100, the drive mechanism 300 for driving the bridge contact 3, and, if necessary, the vacuum switch tube 204 and the drive mechanism for the vacuum switch tube 204, etc.) may be disposed on the substrate 200. In other embodiments, the substrate 200 may be a substrate 200 shared by the selector and the switching switch, and the components of the selector and the switching switch may be disposed on the substrate 200.

[0057] Furthermore, embodiments of this utility model also relate to a transformer (not shown), which may include the on-load tap changer described above.

[0058] 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 contact connection system for a changeover switch used in an on-load tap changer, characterized in that, The contact connection system (100) is configured for mounting on a substrate (200) of an on-load tap changer, the contact connection system comprising a first contact (1), a second contact (2) and a bridge contact (3), wherein: The bridge contact (3) is configured to move relative to the substrate (200) to make electrical contact with the first contact (1) and / or the second contact (2); and The first contact (1) and the second contact (2) are respectively floatingly mounted on the substrate (200) via a pretensioner (4), the pretensioner (4) being configured to bias the corresponding first contact and the second contact toward the bridge contact and press the corresponding first contact or the second contact against the bridge contact when the corresponding first contact or the second contact is in electrical contact with the bridge contact.

2. The contact connection system for a switching switch used in an on-load tap changer according to claim 1, characterized in that, The preload (4) is configured as an elastic element, which is compressed and presses the corresponding first contact or second contact against the bridge contact when the corresponding first contact or second contact is in electrical contact with the bridge contact.

3. The contact connection system for a switching switch used in an on-load tap changer according to claim 2, characterized in that, The first contact (1) and / or the second contact (2) have a flange (50) for the pretensioner, the pretensioner (4) being supported between the flange and the substrate.

4. The contact connection system for a switching switch used in an on-load tap changer according to claim 3, characterized in that, A guide post (51) for the preload is constructed on the side of the flange (50) away from the bridge contact (3).

5. The contact connection system for a switching switch used in an on-load tap changer according to claim 4, characterized in that, The guide post (51) is configured to extend from one side of the substrate (200) toward the bridge contact (3) through the substrate to the side of the substrate away from the bridge contact and form a terminal for electrical connection with an external circuit.

6. The contact connection system for a switching switch for an on-load tap changer according to any one of claims 1 to 5, characterized in that, The ends of the first contact (1) and / or the second contact (2) facing the bridge contact are configured as spherical contact portions (54).

7. The contact connection system for a switching switch for an on-load tap changer according to any one of claims 1 to 5, characterized in that, The bridge contact (3) has an elongated contact surface (31) that can bridge the first contact and the second contact, and inclined guide ramps (32) are respectively constructed at both ends of the contact surface.

8. The contact connection system for a switching device used in an on-load tap changer according to claim 7, characterized in that, The contact connection system (100) includes a carrier plate (7) for the bridge contact (3), the bridge contact being fixed on the carrier plate, and the contact connection system includes a guide structure (8) for the carrier plate, the carrier plate being able to be held in the guide structure and being able to move along the guide structure.

9. The contact connection system for a switching device used in an on-load tap changer according to claim 8, characterized in that, The guide structure (8) and the substrate (200) are constructed as a single piece.

10. The contact connection system for a switching device used in an on-load tap changer according to claim 8, characterized in that, The carrier plate (7) is configured to move relative to the substrate (200) at least between a first position, a second position and a third position, in the first position the bridge contact (3) is in electrical contact with the first contact (1), in the second position the bridge contact (3) is in electrical contact with the first contact (1) and the second contact (2), and in the third position the bridge contact (3) is in electrical contact with the second contact (2).

11. The contact connection system for a switching switch for an on-load tap changer according to any one of claims 8 to 10, characterized in that, A wiring portion (35) for electrical connection to an external circuit is constructed on the side of the bridge contact (3) opposite to the first contact and the second contact.

12. The contact connection system for a switching device used in an on-load tap changer according to claim 11, characterized in that, The bridge contact (3) is fixed on the side of the carrier plate (7) facing the first contact and the second contact, wherein the wiring portion (35) of the bridge contact (3) passes through the carrier plate (7) and extends from the side of the carrier plate away from the first contact and the second contact.

13. The contact connection system for a switching switch for an on-load tap changer according to any one of claims 1 to 5, characterized in that, The first contact (1) is configured to be electrically connected to the moving contact of the vacuum switch tube (204) of the switching switch, the second contact (2) is configured to be electrically connected to the fixed contact of the vacuum switch tube (204), and the bridge contact (3) is configured to be electrically connected to the load lead of the on-load tap changer.

14. A switching switch for on-load tap changers, characterized in that, The switching switch includes a contact connection system for an on-load tap changer according to any one of claims 1 to 13 and a drive mechanism for driving the bridge contacts to move.

15. An on-load tap changer, characterized in that, The on-load tap changer includes a selector and a switching switch according to claim 14, wherein: The substrate (200) is a substrate specifically designed for the switching switch, with only components of the switching switch disposed on the substrate; or The substrate (200) is a substrate shared by the selector and the switching switch, and the components of the selector and the switching switch are disposed on the substrate.

16. A transformer, characterized in that, The transformer includes an on-load tap changer as described in claim 15.

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