Tap changer and power system

Abstract

The application provides a tap switch, which comprises an auxiliary contact, a first fixed contact, a second fixed contact and a main contact. The first fixed contact and the second fixed contact are respectively arranged on the two sides of the auxiliary contact. One end of the main contact is rotationally connected with the auxiliary contact, so that the other end of the main contact can be selectively electrically connected with the first fixed contact or the second fixed contact. Compared with the conventional tap switch, the main contact in the application does not move on the surface of the first fixed contact or the second fixed contact, so that the mechanical wear between the main contact and the first fixed contact and the second fixed contact is reduced, the service life of the tap switch and the power system is prolonged, and the reliability of the tap switch and the power system is improved. Meanwhile, the main contact swings back and forth between the first fixed contact and the second fixed contact, so that the breaking speed of the main contact, the first fixed contact and the second fixed contact is increased, and the ability of the tap switch and the power system to generate harmonic current during breaking is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric power, in particular to a tap changer and an electric power system. BACKGROUND

[0002] The contact mode of the moving contact and the fixed contact in the tap changer used in the market at present mainly has drum type, disc type, cage type, disc type and wedge type. In these contact modes, the fixed contact is usually a single body structure, and its structure is simple. In the switching process of the tap changer, the moving contact slides along the surface of the fixed contact and generates friction force, so that the mechanical wear of the tap changer is large, thereby shortening the service life of the tap changer and reducing the reliability. SUMMARY

[0003] Therefore, it is necessary to provide a tap changer and an electric power system aiming at the problem of shortening the service life and reducing the reliability of the conventional tap changer.

[0004] The technical scheme is as follows:

[0005] In one aspect, a tap changer is provided, comprising:

[0006] an auxiliary contact;

[0007] a first fixed contact and a second fixed contact, the first fixed contact and the second fixed contact are respectively arranged on the two sides of the auxiliary contact; and

[0008] a main contact, one end of the main contact is rotationally connected with the auxiliary contact, so that the other end of the main contact can be selectively electrically connected with the first fixed contact or the second fixed contact.

[0009] The technical scheme is as follows:

[0010] In one embodiment, the other end of the main contact is provided with a first connecting part and a second connecting part arranged at an included angle, when the main contact moves towards the side close to the first fixed contact, the first connecting part can electrically connect the main contact with the first fixed contact and the second connecting part is arranged away from the second fixed contact, when the main contact moves towards the side close to the second fixed contact, the second connecting part can electrically connect the main contact with the second fixed contact and the first connecting part is arranged away from the first fixed contact.

[0011] In one embodiment, the side of the first connecting part away from the first fixed contact is provided with a first heat dissipation part;

[0012] and / or, the side of the second connecting part away from the second fixed contact is provided with a second heat dissipation part;

[0013] And / or, the main contact is provided with a heat dissipation channel.

[0014] In one of the embodiments, the auxiliary contact comprises a contact body, at least two third connecting parts arranged at intervals, and at least two fourth connecting parts arranged at intervals, each of the third connecting parts is arranged at one side of the contact body, and each of the fourth connecting parts is arranged at the other side of the contact body, and the contact body, each of the third connecting parts, and each of the fourth connecting parts are electrically connected with the main contact.

[0015] In one of the embodiments, the fixed contact further comprises a locking part, a first elastic part provided with a first through hole, and a second elastic part provided with a second through hole, the third connecting part is provided with a third through hole corresponding to the first through hole, the fourth connecting part is provided with a fourth through hole corresponding to the second through hole, the contact body is provided with a fifth through hole for connecting the first through hole and the second through hole, the locking part can pass through the third through hole, the first through hole, the fifth through hole, the second through hole, and the fourth through hole in sequence, and make the third connecting part elastically matched with the first elastic part, and the fourth connecting part elastically matched with the second elastic part.

[0016] In one of the embodiments, the auxiliary contact, the first fixed contact, the second fixed contact, and the main contact are two, the two auxiliary contacts, the two first fixed contacts, and the two second fixed contacts are arranged at intervals along the circumferential direction of a preset circle, the line connecting the two auxiliary contacts, the line connecting the two first fixed contacts, and the line connecting the two second fixed contacts all intersect at the center of the preset circle, and the tap changer further comprises a transmission part, two ends of the transmission part are correspondingly movably matched with the other ends of the two main contacts, so that the two main contacts can be simultaneously electrically connected with the two first fixed contacts, or the two main contacts can be simultaneously electrically connected with the two second fixed contacts.

[0017] In one of the embodiments, the other end of the main contact is provided with a sliding part, and two ends of the transmission part are correspondingly slidably matched with the two sliding parts, so that the two main contacts can be simultaneously electrically connected with the two first fixed contacts, or the two main contacts can be simultaneously electrically connected with the two second fixed contacts.

[0018] In one of the embodiments, the sliding part is provided with a sliding groove, and two ends of the transmission part are provided with sliding columns slidably matched with the sliding groove.

[0019] In one of the embodiments, the transmission part is two, and the sliding part is four, along the axis direction of the preset circle, the two sides of the two main contacts are provided with sliding parts, and two ends of the two transmission parts are movably matched with the four sliding parts one by one.

[0020] In another aspect, a power system is provided, comprising a transformer and the tap changer, the tap changer being electrically connected with the transformer, so that the tap changer can adjust the output voltage of the transformer.

[0021] In the tap changer and the power system, when the auxiliary contact needs to be electrically connected with the first fixed contact, the main contact rotates towards the side close to the first fixed contact until the other end of the main contact moves to the position of contacting and being electrically connected with the first fixed contact, so that the auxiliary contact can be electrically connected with the first fixed contact through the main contact. When the auxiliary contact needs to be electrically connected with the second fixed contact, the main contact rotates towards the side close to the second fixed contact, so that the electrical connection between the main contact and the first fixed contact is released, and the other end of the main contact moves to the position of contacting and being electrically connected with the second fixed contact, which improves the convenience of switching of the tap changer and the power system. Compared with the conventional tap changer, the main contact in the present application can swing back and forth between the first fixed contact and the second fixed contact to ensure the electrical connection of the main contact with the first fixed contact or the second fixed contact, and the main contact will not move on the surface of the first fixed contact or the second fixed contact during the swinging process, so that the friction between the main contact and the first fixed contact and the second fixed contact is reduced, and the mechanical wear between the main contact and the first fixed contact and the second fixed contact is reduced, which prolongs the service life of the tap changer and the power system and improves the reliability of the tap changer and the power system. At the same time, during the swinging process of the main contact, the first fixed contact and the second fixed contact will not exert friction on the main contact, so that the breaking speed of the main contact with the first fixed contact and the second fixed contact is increased, and the ability to generate harmonic current during the breaking of the tap changer and the power system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and are used to interpret the specific embodiments of the present application and their descriptions, and do not constitute improper limitations to the present application.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the accompanying drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and other accompanying drawings can be obtained by those skilled in the art without any creative labor.

[0024] Figure 1 It is a structural schematic diagram of the tap changer of an embodiment;

[0025] Figure 2 It is a structural schematic diagram of the auxiliary contact and the main contact of Figure 1 ​

[0026] Figure 3 for Figure 2 Exploded view of the main contact;

[0027] Figure 4 for Figure 1 Exploded view of the auxiliary contact, the first fixed contact, or the second fixed contact.

[0028] Explanation of reference numerals in the attached figures:

[0029] 10. Tap changer; 100. Auxiliary contact; 110. Contact body; 120. Third connecting part; 130. Fourth connecting part; 140. Locking element; 150. First elastic element; 160. Second elastic element; 170. Fifth connecting part; 200. First fixed contact; 300. Second fixed contact; 400. Main contact; 410. First connecting part; 420. Second connecting part; 431. First heat dissipation part; 432. Second heat dissipation part; 440. Heat dissipation channel; 450. Sliding part; 460. Slide groove; 500. Bearing; 600. Transmission element; 610. Slide column; 700. Mounting base. Detailed Implementation

[0030] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] In one embodiment, a power system is provided, including a transformer and a tap changer 10. The tap changer 10 is electrically connected to the transformer, enabling the tap changer 10 to regulate the output voltage of the transformer. Thus, the tap changer 10 can adjust the output voltage of the transformer, ensuring that the transformer can stably and reliably output its rated voltage, thereby improving the applicability and reliability of the power system.

[0032] The transformer can be an existing transformer device.

[0033] like Figure 1 As shown, a tap changer 10 is provided, including an auxiliary contact 100, a first fixed contact 200, a second fixed contact 300, and a main contact 400. The first fixed contact 200 and the second fixed contact 300 are respectively spaced apart on both sides of the auxiliary contact 100. One end of the main contact 400 is rotatably connected to the auxiliary contact 100, allowing the other end of the main contact 400 to be selectively electrically connected to either the first fixed contact 200 or the second fixed contact 300.

[0034] In use, when the auxiliary contact 100 in the tap switch 10 needs to be electrically connected with the first fixed contact 200, the main contact 400 is rotated towards the side close to the first fixed contact 200 until the other end of the main contact 400 moves to a position in contact with and electrically connected with the first fixed contact 200, so that the auxiliary contact 100 can be electrically connected with the first fixed contact 200 through the main contact 400. When the auxiliary contact 100 in the tap switch 10 needs to be electrically connected with the second fixed contact 300, the main contact 400 is rotated towards the side close to the second fixed contact 300, so that the electrical connection between the main contact 400 and the first fixed contact 200 is released, and the other end of the main contact 400 moves to a position in contact with and electrically connected with the second fixed contact 300, thereby improving the convenience of switching of the tap switch 10. Compared with the conventional tap switch 10, the main contact 400 in the present application can swing back and forth between the first fixed contact 200 and the second fixed contact 300 to ensure that the main contact 400 can be selectively electrically connected with the first fixed contact 200 or the second fixed contact 300, and the main contact 400 will not move on the surface of the first fixed contact 200 or the second fixed contact 300 during the swinging process, so that the friction between the main contact 400 and the first fixed contact 200 or the second fixed contact 300 is reduced, thereby reducing the mechanical wear between the main contact 400 and the first fixed contact 200 or the second fixed contact 300, prolonging the service life of the tap switch 10 and improving the reliability of the tap switch 10. At the same time, during the swinging process of the main contact 400, neither the first fixed contact 200 nor the second fixed contact 300 exerts a friction force on the main contact 400, so that the breaking speed of the main contact 400 and the first fixed contact 200 or the second fixed contact 300 is increased, thereby improving the ability of the tap switch 10 to generate harmonic currents during breaking.

[0035] In the present application, the rotation connection between the one end of the main contact 400 and the auxiliary contact 100 can be that the one end of the main contact 400 is rotationally connected with the one end of the auxiliary contact 100 through a bearing 500, a rotating shaft or other rotating structure.

[0036] In the present application, the other end of the main contact 400 can be in abutting contact with both the first fixed contact 200 and the second fixed contact 300. In this way, the first fixed contact 200 and the second fixed contact 300 can both function as abutting positioning, so that the main contact 400 can be efficiently and accurately rotated to a position in contact with and electrically connected with the first fixed contact 200 or the second fixed contact 300, thereby improving the convenience and switching efficiency of the tap switch 10.

[0037] As shown in FIG. 1, the tap switch 10 comprises a main contact 400, a first fixed contact 200 and a second fixed contact 300. Figure 1 and Figure 2As shown, further, the other end of the main contact 400 is provided with a first connecting portion 410 and a second connecting portion 420 arranged at an included angle, when the main contact 400 moves towards the side close to the first fixed contact 200, the first connecting portion 410 can electrically connect the main contact 400 and the first fixed contact 200, and the second connecting portion 420 is arranged spaced apart from the second fixed contact 300, when the main contact 400 moves towards the side close to the second fixed contact 300, the second connecting portion 420 can electrically connect the main contact 400 and the second fixed contact 300, and the first connecting portion 410 is arranged spaced apart from the first fixed contact 200. In this way, the rotation angle of the main contact 400 is reduced, so that the main contact 400 can quickly reciprocate between the first fixed contact 200 and the second fixed contact 300, improving the switching rate of the tap changer 10. In addition, by arranging the first connecting portion 410 and the second connecting portion 420 at the other end of the main contact 400, the heat dissipation area of the main contact 400 is increased, and the heat dissipation rate of the main contact 400 is further increased, avoiding the temperature of the tap changer 10 being too high, and improving the short-circuit resistance of the tap changer 10.

[0038] The included angle between the first connecting portion 410 and the second connecting portion 420 can be flexibly adjusted according to actual needs. In the embodiment, the first connecting portion 410 and the second connecting portion 420 are arranged at an included angle of 120°. The first connecting portion 410, the second connecting portion 420 and the main contact 400 are formed integrally. The first connecting portion 410 and the second connecting portion 420 are both conductive contacts.

[0039] Specifically, the main contact 400 is an obtuse-angle triangular prism, one end of the main contact 400 is rotatably connected to the auxiliary contact 100, and the first connecting portion 410 and the second connecting portion 420 are both arranged on the side opposite to the obtuse angle, and the first connecting portion 410 and the second connecting portion 420 are respectively located on the extension lines of the two sides adjacent to the obtuse angle of the main contact 400.

[0040] As shown in Figure 1 , Figure 2 and Figure 3 , optionally, the first connecting portion 410 is provided with a first heat dissipation portion 431 away from the first fixed contact 200. In this way, the first heat dissipation portion 431 can accelerate the heat dissipation rate of the first connecting portion 410, ensure that the temperature of the tap changer 10 will not be too high, and improve the short-circuit resistance of the tap changer 10.

[0041] The first heat dissipation portion 431 can be a heat dissipation fin, a heat dissipation plate or other heat dissipation structure.

[0042] Optionally, the first heat dissipation part 431 is a first heat dissipation plate, which is detachably arranged on the side of the first connecting part 410 away from the first fixed contact 200. In this way, the first heat dissipation plate can be detached and replaced according to actual needs, improving the applicability and service life of the tap changer 10.

[0043] The main contact 400, the first connecting part 410, and the second connecting part 420 are all made of a mixed material of copper and tungsten, and the heat dissipation plate is made of pure copper material. The heat dissipation plate can be fixed on the side of the first connecting part 410 away from the first fixed contact 200 by screwing, clamping, inserting, or other detachable connection methods.

[0044] As shown in Figure 1 , Figure 2 and Figure 3 , optionally, the second connecting part 420 is provided with a second heat dissipation part 432 on the side away from the second fixed contact 300. In this way, the second heat dissipation part 432 can accelerate the heat dissipation rate of the second connecting part 420, ensuring that the temperature of the tap changer 10 does not become too high, and improving the short-circuit resistance of the tap changer 10. In the embodiment, the second heat dissipation part 432 is a second heat dissipation plate, which is detachably arranged on the side of the second connecting part 420 away from the second fixed contact 300.

[0045] As shown in Figure 2 and Figure 3 , optionally, the main contact 400 is provided with a heat dissipation channel 440. In this way, the heat dissipation area of the main contact 400 is increased, the heat dissipation rate of the main contact 400 is increased, the temperature of the tap changer 10 is prevented from becoming too high, and the short-circuit resistance of the tap changer 10 is improved.

[0046] The number of heat dissipation channels 440 can be flexibly adjusted according to actual needs. For example, the number of heat dissipation channels 440 is three, four, or five, etc.

[0047] The structures of the auxiliary contact 100, the first fixed contact 200, and the second fixed contact 300 can be the same or different. In the embodiment, the structures and principles of the auxiliary contact 100, the first fixed contact 200, and the second fixed contact 300 are the same or similar. The auxiliary contact 100 is taken as an example for description, which should not be understood as a limitation on the embodiment.

[0048] As shown in Figure 2As shown in FIG. 4, in one embodiment, the auxiliary contact 100 comprises a contact body 110, at least two third connecting portions 120 and at least two fourth connecting portions 130, each third connecting portion 120 is arranged on one side of the contact body 110, and each fourth connecting portion 130 is arranged on the other side of the contact body 110, and the contact body 110, each third connecting portion 120 and each fourth connecting portion 130 are electrically connected with the main contact 400. In this way, the third connecting portions 120 are arranged at intervals, and the fourth connecting portions 130 are arranged at intervals, so that the heat dissipation performance of the auxiliary contact 100 is increased, the temperature of the auxiliary contact 100 is reduced, and the short-circuit resistance of the tap changer 10 is improved. In addition, each third connecting portion 120 and each fourth connecting portion 130 can be connected in parallel between the contact body 110 and the main contact 400, so that the conductive loop between the contact body 110 and the main contact 400 is increased, and the current carrying capacity of the tap changer 10 is improved.

[0049] The third connecting portion 120 and the fourth connecting portion 130 can be laminated contacts. The number of third connecting portions 120 and fourth connecting portions 130 can be flexibly adjusted according to actual needs. In the embodiment, the number of third connecting portions 120 and fourth connecting portions 130 is five.

[0050] As shown in FIG. 4, Figure 2 and Figure 4 Optionally, the fixed contact further comprises a locking member 140, a first elastic member 150 provided with a first through hole, and a second elastic member 160 provided with a second through hole, the third connecting portion 120 is provided with a third through hole corresponding to the first through hole, the fourth connecting portion 130 is provided with a fourth through hole corresponding to the second through hole, and the contact body 110 is provided with a fifth through hole for connecting the first through hole and the second through hole, the locking member 140 can pass through the third through hole, the first through hole, the fifth through hole, the second through hole and the fourth through hole in sequence, and the third connecting portion 120 and the first elastic member 150 are elastically matched, and the fourth connecting portion 130 and the second elastic member 160 are elastically matched. In this way, the first elastic member 150 and the second elastic member 160 can play a role of elastic shock absorption, so that the third connecting portion 120 or the fourth connecting portion 130 does not bounce due to the extrusion of the main contact 400 during the swing of the main contact 400, and an electric arc is not generated, so that the generation of acetylene due to the electric arc of the tap changer 10 is avoided, and the safety and environmental protection performance of the tap changer 10 are improved.

[0051] The locking member 140 can be a latch, a bolt or other locking structure. The first elastic member 150 and the second elastic member 160 can be springs, elastic washers or other elastic structures.

[0052] As shown in FIG. 4, Figure 4As shown, in other embodiments, both the first fixed contact 200 and the second fixed contact 300 further include a fifth connecting portion 170, each fifth connecting portion 170 being used to electrically connect the respective third connecting portions 120 and the respective fourth connecting portions 130. This improves the reliability of the electrical connection between the main contact 400 and the third connecting portions 120 and the fourth connecting portions 130.

[0053] like Figure 1 and Figure 2 As shown, in one embodiment, there are two auxiliary contacts 100, two first fixed contacts 200, two second fixed contacts 300, and two main contacts 400. The two auxiliary contacts 100, the two first fixed contacts 200, and the two second fixed contacts 300 are all spaced apart along the circumferential direction of a preset circle. The lines connecting the two auxiliary contacts 100, the two first fixed contacts 200, and the two second fixed contacts 300 all intersect at the center of the preset circle. The tap changer 10 also includes a transmission member 600. The two ends of the transmission member 600 are correspondingly movable and engaged with the other ends of the two main contacts 400, so that the two main contacts 400 can be electrically connected to the two first fixed contacts 200 at the same time, or the two main contacts 400 can be electrically connected to the two second fixed contacts 300 at the same time. Thus, when the auxiliary contact 100 needs to be electrically connected to the first fixed contact 200, the transmission member 600 rotates counterclockwise around the axis of the preset circle, so that the two ends of the transmission member 600 can move relative to the two main contacts 400 and drive the two main contacts 400 to rotate toward the side closer to the corresponding first fixed contact 200, until the transmission member 600 and the two main contacts 400 are in contact and engaged, and the two main contacts 400 can be in contact and engaged with the two first fixed contacts 200 one by one and electrically connected. In this way, the transmission member 600 can lock the two main contacts 400, the two auxiliary contacts 100 and the two first fixed contacts 200 into one, thereby improving the reliability of the tap changer 10. When the auxiliary contact 100 needs to be electrically connected to the second fixed contact 300, the transmission member 600 rotates clockwise around the axis of a preset circle, so that the two ends of the transmission member 600 can move relative to the main contact 400 and drive the two main contacts 400 to rotate toward the side closer to the corresponding second fixed contact 300. This releases the contact between the transmission member 600 and the two main contacts 400, as well as the contact and electrical connection between the two main contacts 400 and the two first fixed contacts 200, until the two ends of the transmission member 600 re-engage with the two main contacts 400, and the two main contacts 400 can engage with and be electrically connected to the two second fixed contacts 300 one by one. This allows the transmission member 600 to lock the two main contacts 400, the two auxiliary contacts 100, and the two second fixed contacts 300 into one unit. The operation is simple and reliable, improving the reliability and switching efficiency of the tap changer 10.

[0054] The preset circle does not exist in an actual process. The embodiment only uses the preset circle to better describe the positional relationship between the auxiliary contact 100, the first fixed contact 200, and the second fixed contact 300. The diameter of the preset circle can be flexibly adjusted according to actual use needs.

[0055] The transmission member 600 can be a transmission rod, a transmission sheet, a transmission pipe, or other transmission structures. The two ends of the transmission member 600 are correspondingly movably connected to the other ends of the two main contacts 400. The two ends of the transmission member 600 can be correspondingly slidably connected to the other ends of the two main contacts 400, or the two ends of the transmission member 600 can be correspondingly rollably connected to the other ends of the two main contacts 400. It is only required that the transmission member 600 does not interfere with the main contacts 400 during rotation, and the transmission member 600 can drive the two main contacts 400 to be correspondingly electrically connected to the two first fixed contacts 200 or the two second fixed contacts 300.

[0056] As shown in Figure 1 , Figure 2 and Figure 3 , further, the other end of the main contact 400 is provided with a sliding part 450, and the two ends of the transmission member 600 are correspondingly slidably connected to the two sliding parts 450, so that the two main contacts 400 can be simultaneously electrically connected to the two first fixed contacts 200, or the two main contacts 400 can be simultaneously electrically connected to the two second fixed contacts 300. In this way, by providing the sliding part 450, it is ensured that the transmission member 600 does not interfere with the main contacts 400 during rotation, thereby improving the reliability of the tap changer 10.

[0057] As shown in Figure 1 and Figure 3 , optionally, the sliding part 450 is provided with a sliding groove 460, and the two ends of the transmission member 600 are each provided with a sliding column 610 that is slidably connected to the sliding groove 460. In this way, the sliding column 610 can reciprocally move along the extension direction of the sliding groove 460, so that the transmission member 600 can smoothly and reliably drive the two main contacts 400 to rotate, to ensure that the two main contacts 400 can be simultaneously electrically connected to the two first fixed contacts 200, or the two main contacts 400 can be simultaneously electrically connected to the two second fixed contacts 300, thereby improving the reliability of the tap changer 10.

[0058] The sliding part 450 can be a sliding block, a sliding rail, a dial, or other sliding structures. In the embodiment, the sliding part 450 is arranged between the first connecting part 410 and the second connecting part 420. In this way, the sliding part 450 does not interfere with the first connecting part 410, the second connecting part 420, or external objects, thereby improving the reliability of the tap changer 10.

[0059] As shown in Figure 1 and Figure 3As shown, optionally, the transmission member 600 is two, the sliding part 450 is four, and the two sides of the two main contacts 400 are provided with the sliding part 450 along the axis direction of the preset circle, and the two ends of the two transmission members 600 are correspondingly and movably connected with the four sliding parts 450. In this way, by increasing the number of the transmission member 600 and the sliding part 450, it is ensured that the transmission member 600 can stably and reliably drive the main contact 400 to rotate, thereby improving the reliability of the tap changer 10.

[0060] Specifically, in the embodiment, the transmission member 600 is two, the sliding part 450 is four, and the two sides of the two main contacts 400 are provided with the sliding part 450 along the axis direction of the preset circle, and the two ends of the two transmission members 600 are correspondingly and movably connected with the four sliding parts 450. In this way, it is ensured that the transmission member 600 can stably and reliably drive the two main contacts 400 to rotate.

[0061] As shown in the drawings, Figure 1 In one embodiment, the tap changer 10 includes a mounting seat 700, and the auxiliary contact 100, the first fixed contact 200 and the second fixed contact 300 are correspondingly mounted on the mounting seat 700. In this way, the assembly convenience of the tap changer 10 is improved.

[0062] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The term "and / or" used in the present application includes any and all combinations of one or more related listed items.

[0063] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0064] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0065] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0066] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0067] It should also be understood that, in interpreting the connection or positional relationships of components, although not explicitly described, connection and positional relationships are interpreted to include a range of error, which should be within the acceptable deviation range of a specific value as determined by a person skilled in the art. For example, "approximately," "about," or "substantially" can mean within one or more standard deviations, without limitation herein.

[0068] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be noted that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A tap changer, characterized in that The utility model relates to a tap changer, comprising: an auxiliary contact; a first fixed contact and a second fixed contact, which are respectively arranged on two sides of the auxiliary contact; a main contact, one end of which is rotatably connected with the auxiliary contact, so that the other end of the main contact can be selectively electrically connected with the first fixed contact or the second fixed contact; wherein the other end of the main contact is provided with a first connecting part and a second connecting part arranged at an included angle, the first connecting part is provided with a first heat dissipation part away from one side of the first fixed contact, the second connecting part is provided with a second heat dissipation part away from one side of the second fixed contact, and the main contact is provided with a heat dissipation channel; the auxiliary contact comprises a contact body, at least two third connecting parts arranged at intervals, and at least two fourth connecting parts arranged at intervals, each third connecting part is arranged on one side of the contact body, and each fourth connecting part is correspondingly arranged on the other side of the contact body, the contact body, each third connecting part and each fourth connecting part are electrically connected with the main contact; the auxiliary contact further comprises a locking member, a first elastic member provided with a first through hole, and a second elastic member provided with a second through hole, the third connecting part is provided with a third through hole in communication with the first through hole, the fourth connecting part is provided with a fourth through hole in communication with the second through hole, the contact body is provided with a fifth through hole for communicating the first through hole and the second through hole, the locking member can pass through the third through hole, the first through hole, the fifth through hole, the second through hole and the fourth through hole in sequence, and make the third connecting part elastically matched with the first elastic member and the fourth connecting part elastically matched with the second elastic member. When the main contact moves towards the side close to the first fixed contact, the first connecting part can electrically connect the main contact with the first fixed contact and the second connecting part is arranged away from the second fixed contact, and when the main contact moves towards the side close to the second fixed contact, the second connecting part can electrically connect the main contact with the second fixed contact and the first connecting part is arranged away from the first fixed contact.

2. The tap changer according to claim 1, characterized in that The auxiliary contact, the first fixed contact, the second fixed contact and the main contact are two, two auxiliary contacts, two first fixed contacts and two second fixed contacts are arranged at intervals along the circumferential direction of a preset circle, the lines connecting two auxiliary contacts, two first fixed contacts and two second fixed contacts intersect at the center of the preset circle, and the tap changer further comprises a transmission member, two ends of the transmission member are correspondingly movably matched with the other ends of two main contacts, so that two main contacts can be simultaneously electrically connected with two first fixed contacts, or two main contacts can be simultaneously electrically connected with two second fixed contacts.

3. The tap changer according to claim 1 or 2, characterized in that ​ 4. The tap changer according to claim 3, characterized in that The other end of the main contact is provided with a sliding part, and the two ends of the transmission part are correspondingly and slidingly matched with the two sliding parts, so that the two main contacts can be electrically connected with the two first fixed contacts at the same time, or the two main contacts can be electrically connected with the two second fixed contacts at the same time.

5. The tap changer according to claim 4, characterized in that The sliding part is provided with a sliding groove, and the two ends of the transmission part are provided with sliding columns which are slidingly matched with the sliding groove.

6. The tap changer according to claim 4, characterized in that The transmission part is two, and the sliding part is four. Along the axis direction of the preset circle, the two sides of the two main contacts are provided with the sliding parts, and the two ends of the two transmission parts are correspondingly and movably matched with the four sliding parts.

7. A power system characterized by, The tap changer is electrically connected with the transformer, so that the tap changer can adjust the output voltage of the transformer.

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