Phase-change switch and power equipment with same

Abstract

The invention provides a phase-change switch and power equipment with the same. The phase-change switch is characterized in that each static contact comprises a main contact and an auxiliary contact which are arranged in the circumferential direction; the three phase loops are in one-to-one correspondence with the three static contacts, each phase loop comprises a main loop and an auxiliary loop, the first end of the main loop is connected with the first end of the auxiliary loop, the second end of the main loop is connected with the main contact, a solid-state switch is arranged on the auxiliary loop, and the second end of the auxiliary loop is connected with the auxiliary contact; when the movable contact piece is in a conducting state, the movable contact piece is selectively conducted with one of the three main contacts, when the movable contact piece is in a first switching state, the movable contact piece is conducted with the auxiliary contact, and when the movable contact piece is in a second switching state, the movable contact piece is conducted with the main contact and the auxiliary contact which are arranged adjacently. Through the technical scheme provided by the invention, the problem that the contact of the change-over switch is seriously ablated due to the existence of electric arc in the switching process of the change-over switch in the related technology can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of phase-changing switches, and in particular to a phase-changing switch and an electric power device having the same. Background Art

[0002] my country's low-voltage distribution network adopts a three-phase four-wire system, which makes it difficult to avoid the problem of three-phase load imbalance caused by load. As early as the 1990s, China had a clear understanding of the hazards of three-phase imbalance. The hazards of three-phase imbalance mainly include: increased distribution transformer and line losses; causing the neutral point of Yyn0 transformer to drift, resulting in a large zero-sequence voltage; the harm of negative sequence voltage to induction motors; unable to operate at full capacity, and increased overheating defects.

[0003] Among them, the earliest domestic regulation on three-phase current imbalance was SD292-1988 "Operation Regulations for Overhead Distribution Lines and Equipment", which stipulated that the current imbalance of low-voltage distribution networks should not exceed 15%, and the neutral current of three-phase transformers with only a small amount of single-phase load should not exceed 25% of the rated current. Q / GDW1519-2014 "Operation and Maintenance Regulations for Distribution Networks" stipulates that the load imbalance of Yyn0 connection transformers should not exceed 15%, and the neutral current should not exceed 25% of the rated current of the transformer; the load imbalance of Dyn11 connection transformers should not exceed 25%, and the neutral current should not exceed 40% of the rated current of the transformer.

[0004] In China, for three-phase voltage imbalance, GB / T15543-1995 "Three-phase Voltage Unbalance for Power Quality" stipulates that the allowable value of normal voltage imbalance at the common connection point of the power system is 2%, and it shall not exceed 4% for a short time. However, this standard only considers the impact of unbalanced voltage on motor load, and its imbalance refers to negative sequence imbalance. There is no limit on zero sequence voltage in the standard. Until 2008, the standard added requirements for zero sequence voltage, that is, the zero sequence voltage limit of the low voltage system is not temporarily stipulated, but the voltage of each phase must meet the requirements of GB / T12325. "GB / T12325 Power Quality Supply Voltage Deviation" 4.3 stipulates: The voltage deviation of 220V single-phase supply is +7% and -10% of the nominal voltage.

[0005] In the early stage, the domestic response measures for low-voltage three-phase imbalance were mainly reflected in the design and management links, while there was little research and application of governance devices. For example, in the design link, the distribution transformer was changed from Yyn0 to Dyn11. In the management link, the access capacity of single-phase users was reasonably allocated, a reasonable neutral line interface was selected, and daily operation and maintenance phase change were strengthened.

[0006] After 2005, devices for three-phase unbalanced management appeared one after another. The first to appear was the three-phase split reactive power compensation device, which took measures to properly connect a number of power capacitors / inductors between phases and between each phase and the neutral line, which not only compensated the power factor of each phase well, but also basically balanced the active current of each phase. In 2011, Zibo Power Supply Company proposed a manually operated three-phase load imbalance adjustment switch, which shortened the power outage of phase-changing operation from 3.5 hours to 2 minutes. It has a simple structure and formed the prototype of the phase-changing switch. Since 2015, there has been a boom in the research and treatment of three-phase imbalance problems in China, and the treatment methods generally revolve around three types of devices: 1) phase-changing switch type; 2) three-phase capacitor reactive power compensation type; 3) power electronics comprehensive treatment type. The latter two treatment technologies are often used to treat the three-phase current imbalance of the transformer, while the phase-changing switch type technology can be used to treat the transformer and low-voltage line globally. Therefore, the phase-changing switch type treatment technology has gradually become the main technology for three-phase imbalance treatment technology in recent years, and its research and application have also shown an increasing trend year by year.

[0007] In the related technologies, with the trend of power distribution Internet of Things, the phase-changing switches have been more intelligently monitored, and the phase-changing switch technology has gradually become the only way to solve the problem of low-voltage three-phase imbalance. Among them, the phase-changing switches include the phase-changing switches using STS (composed of intelligent control panels, high-speed thyristors and circuit breakers) and the composite phase-changing switches (composed of power electronic devices and mechanical switches, where the power electronic devices mainly include thyristors, solid-state relays and IGBTs, and the mechanical switches include contactors, relays, magnetic latching relays and permanent magnet fast switches). At present, the phase-changing switches that are widely studied and applied in China are generally composite phase-changing switches.

[0008] However, the reversing switch in the related art generates arcs during the switching process, which causes serious ablation of the contacts of the reversing switch. Summary of the invention

[0009] The present invention provides a phase-changing switch and an electric power device having the same, so as to solve the problem in the related art that an arc occurs in the switching process of the phase-changing switch, which causes serious ablation of the contacts of the phase-changing switch.

[0010] According to one aspect of the present invention, a phase-changing switch is provided, which includes: a static contact having three static contacts arranged in a circumferential direction, each static contact including a main contact and an auxiliary contact arranged in the circumferential direction; three phase circuits corresponding to the three static contacts one by one, the phase circuit including a main circuit and an auxiliary circuit, the first end of the main circuit is connected to the first end of the auxiliary circuit, the second end of the main circuit is connected to the main contact, a solid-state switch is arranged on the auxiliary circuit, and the second end of the auxiliary circuit is connected to the auxiliary contact; a moving contact rotatably arranged in a circumferential direction, the moving contact having a conducting state, a first switching state and a second switching state, when the moving contact is in the conducting state, the moving contact can selectively conduct with one of the three main contacts, when the moving contact is in the first switching state, the moving contact is conducted with the auxiliary contact, and when the moving contact is in the second switching state, the moving contact is conducted with the adjacent main contact and auxiliary contact.

[0011] Furthermore, each static contact includes two auxiliary contacts arranged in a circumferential direction, and the main contact of the static contact is arranged between the two auxiliary contacts of the static contact. The first switching state includes: a first sub-switching state, in which the moving contact is connected to an auxiliary contact; and a second sub-switching state, in which the moving contact is connected to two auxiliary contacts of two adjacent static contacts.

[0012] Furthermore, the phase-changing switch also includes a control component, which is connected to the solid-state switch signal to control the closing or opening of the solid-state switch. The second sub-switching state includes: a first auxiliary conduction state, in the rotation direction of the moving contact, the solid-state switch corresponding to the auxiliary contact located upstream of the moving contact is closed, and the solid-state switch corresponding to the auxiliary contact located downstream of the moving contact is disconnected; a second auxiliary conduction state, in the rotation direction of the moving contact, the solid-state switch corresponding to the auxiliary contact located upstream of the moving contact is disconnected, and the solid-state switch corresponding to the auxiliary contact located downstream of the moving contact is closed.

[0013] Further, the moving contact comprises a moving contact arc extending along the circumferential direction.

[0014] Furthermore, the central angle corresponding to the moving contact is greater than the central angle corresponding to two adjacent contact points on the stationary contact.

[0015] Furthermore, the central angle corresponding to the moving contact is smaller than the central angle corresponding to three adjacent contact points on the stationary contact.

[0016] Furthermore, the central angles corresponding to any two adjacent contact points on the stationary contact are equal.

[0017] Furthermore, the stationary contact member comprises a stationary contact ring extending in a circumferential direction, and three stationary contact points are arranged on an inner side wall of the stationary contact ring.

[0018] Further, the solid-state switch comprises a thyristor.

[0019] According to another aspect of the present invention, there is provided an electric power device, the electric power device comprising the above-mentioned phase-changing switch.

[0020] Applying the technical solution of the present invention, the phase-changing switch includes a static contact, a moving contact and three phase circuits, wherein the main contact is the contact that contacts the moving contact during long-term normal working process, and the auxiliary contact is the contact that is connected to the moving contact for a short time during the switching process. The moving contact rotates so that the moving contact is selectively connected to phase A, phase B or phase C, so that phase A, phase B or phase C supplies power to the load. By setting an auxiliary contact, when the moving contact rotates to switch the load power supply, the moving contact is switched from the conduction state in which the main contact corresponding to the current phase is connected to the second switching state in which the main contact and the auxiliary contact corresponding to the current phase are connected, and then to the first switching state in which the auxiliary contact corresponding to the current phase is connected, and finally to the conduction state in which the main contact corresponding to the next phase is connected to complete the switching. In this process, by adding auxiliary contacts and since a solid-state switch is provided on the auxiliary circuit, the moving contact is prevented from directly switching between the conduction states in which different main contacts are connected, arcing is avoided in the phase-changing switch during the switching process, contact erosion of the phase-changing switch is reduced, and the mechanical life of the phase-changing switch is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 A schematic structural diagram of a phase-changing switch when a moving contact is in a conducting state according to an embodiment of the present invention is shown;

[0023] Figure 2 It shows a structural schematic diagram of a phase-changing switch when a movable contact is in a second switching state according to an embodiment of the present invention;

[0024] Figure 3 It shows a schematic structural diagram of a phase-changing switch when a movable contact is in a first sub-switching state according to an embodiment of the present invention;

[0025] Figure 4 It shows a schematic structural diagram of a phase-changing switch when a moving contact is in a first auxiliary conduction state according to an embodiment of the present invention;

[0026] Figure 5 It shows a schematic structural diagram of a phase-changing switch when a moving contact is in a second auxiliary conduction state according to an embodiment of the present invention;

[0027] Figure 6It shows a schematic structural diagram of a phase-changing switch when a movable contact is in a first sub-switching state according to an embodiment of the present invention;

[0028] Figure 7 It shows a structural schematic diagram of a phase-changing switch when a movable contact is in a second switching state according to an embodiment of the present invention;

[0029] Figure 8 A schematic structural diagram of a phase-changing switch when a movable contact is in a conducting state according to an embodiment of the present invention is shown.

[0030] The above drawings include the following reference numerals:

[0031] 10. Stationary contact; 11. Stationary contact; 111. Main contact; 112. Auxiliary contact;

[0032] 20. Phase circuit; 21. Main circuit; 22. Auxiliary circuit; 23. Solid-state switch;

[0033] 30, moving contact; 40, phase A; 50, phase B; 60, phase C; 70, working phase. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] like Figures 1 to 8As shown, an embodiment of the present invention provides a phase-changing switch, which includes a static contact 10, a dynamic contact 30 and three phase circuits 20. The static contact 10 has three static contacts 11 arranged in a circumferential direction. Each static contact 11 includes a main contact 111 and an auxiliary contact 112 arranged in a circumferential direction. The three phase circuits 20 correspond to the three static contacts 11 one by one. The phase circuit 20 includes a main circuit 21 and an auxiliary circuit 22. The first end of the main circuit 21 is connected to the first end of the auxiliary circuit 22, and the second end of the main circuit 21 is connected to the main contact 111. The auxiliary circuit 22 is provided with There is a solid-state switch 23, the second end of the auxiliary circuit 22 is connected to the auxiliary contact 112, the moving contact 30 is rotatably arranged in the circumferential direction, and the moving contact 30 has a conducting state, a first switching state and a second switching state. When the moving contact 30 is in the conducting state, the moving contact 30 can selectively conduct with one of the three main contacts 111. When the moving contact 30 is in the first switching state, the moving contact 30 is conducted with the auxiliary contact 112. When the moving contact 30 is in the second switching state, the moving contact 30 is conducted with the adjacent main contacts 111 and the auxiliary contact 112.

[0036] Specifically, the working phase 70 is electrically connected to the moving contact 30, and the three main contacts 111 are respectively electrically connected to the phase A, the phase B, and the phase C. The working phase 70 can lead the phase A, the phase B, or the phase C to supply power to the load.

[0037] The phase-changing switch provided in this embodiment is applied, and the phase-changing switch includes a static contact 10, a moving contact 30 and three phase circuits 20, wherein the main contact 111 is a contact that contacts the moving contact 30 during long-term normal working process, and the auxiliary contact 112 is a contact that is connected to the moving contact 30 for a short time during the switching process. The moving contact 30 rotates so that the moving contact 30 is selectively connected to phase A, phase B or phase C, so that phase A, phase B or phase C supplies power to the load. By setting the auxiliary contact 112, when the moving contact 30 rotates to switch the load power supply, the moving contact 30 is switched from the conducting state in which the main contact 111 corresponding to the current phase is connected to the second switching state in which the main contact 111 and the auxiliary contact 112 corresponding to the current phase are connected, and then to the first switching state in which the auxiliary contact 112 corresponding to the current phase is connected, and finally to the conducting state in which the main contact 111 corresponding to the next phase is connected to complete the switching. In this process, by adding the auxiliary contact 112, since the solid-state switch 23 is provided on the auxiliary circuit 22, the moving contact 30 is prevented from directly switching between the conducting states in which different main contacts 111 are connected, and arcing is avoided in the phase-changing switch during the switching process, thereby reducing contact erosion of the phase-changing switch and extending the mechanical life of the phase-changing switch.

[0038] It should be noted that the adjacent main contact 111 and auxiliary contact 112 may belong to the same stationary contact 11 , or may respectively belong to two adjacent stationary contacts 11 .

[0039] like Figures 1 to 8 As shown, each static contact 11 includes two auxiliary contacts 112 arranged in a circumferential direction, the main contact 111 of the static contact 11 is arranged between the two auxiliary contacts 112 of the static contact 11, and the first switching state includes a first sub-switching state and a second sub-switching state. When the moving contact 30 is in the first sub-switching state, the moving contact 30 is connected to one auxiliary contact 112, and when the moving contact 30 is in the second sub-switching state, the moving contact 30 is connected to the two auxiliary contacts 112 of two adjacent static contacts 11. By using the above-mentioned static contact 11, when the moving contact 30 rotates to switch the load power supply, the moving contact 30 is switched from the conducting state in which the main contact 111 corresponding to the current phase is conducting to the second switching state in which the main contact 111 corresponding to the current phase and the auxiliary contact 112 are conducting, and then to the second sub-switching state in which the auxiliary contact 112 corresponding to the current phase and the auxiliary contact 112 corresponding to the next phase are conducting, and then to the first sub-switching state in which the auxiliary contact 112 corresponding to the next phase is conducting, and then to the second sub-switching state in which the auxiliary contact 112 corresponding to the next phase is conducting. The switching is completed by switching the main contact 111 and the auxiliary contact 112 corresponding to one phase to the second switching state in which the main contact 111 and the auxiliary contact 112 are connected to each other, and finally to the conductive state in which the main contact 111 corresponding to the next phase is connected to complete the switching. In this process, the two auxiliary contacts 112 corresponding to the current phase and the next phase are used as transitions. When the moving contact 30 switches between the two phases, the moving contact 30 is prevented from contacting the main contact 111 corresponding to any phase, so as to avoid arcing during the switching process of the phase-changing switch, reduce contact erosion of the phase-changing switch, and extend the mechanical life of the phase-changing switch.

[0040] Specifically, the auxiliary circuit 22 includes a main circuit and two branch circuits. One end of the main circuit is electrically connected to the main contact 111 of the corresponding static contact 11. The solid-state switch 23 is arranged on the main circuit. The first ends of the two branch circuits are electrically connected to the other end of the main circuit. The second ends of the two branch circuits are respectively electrically connected to the two auxiliary contacts 112 of the corresponding static contact 11.

[0041] like Figures 1 to 8As shown, the phase-changing switch also includes a control component, which is connected to the solid-state switch 23 signal to control the solid-state switch 23 to close or open. The second sub-switching state includes a first auxiliary conduction state and a second auxiliary conduction state. When the moving contact 30 is in the first auxiliary conduction state, in the rotation direction of the moving contact 30, the solid-state switch 23 corresponding to the auxiliary contact 112 located upstream and conducted by the moving contact 30 is closed, and the solid-state switch 23 corresponding to the auxiliary contact 112 located downstream and conducted by the moving contact 30 is disconnected. When the moving contact 30 is in the second auxiliary conduction state, in the rotation direction of the moving contact 30, the solid-state switch 23 corresponding to the auxiliary contact 112 located upstream and conducted by the moving contact 30 is disconnected, and the solid-state switch 23 corresponding to the auxiliary contact 112 located downstream and conducted by the moving contact 30 is closed.

[0042] Specifically, the switching process of the movable contact 30 from being connected to the A phase 40 to being connected to the B phase 50 is as follows: Figures 1 to 8 As shown:

[0043] (1) Figure 1 As shown, at this time, the moving contact 30 only contacts the main contact 111 of the A phase 40 to be connected with the A phase 40;

[0044] (2) Figure 2 As shown, at this time, the moving contact 30 only contacts the main contact 111 and one auxiliary contact 112 of the A phase 40 to be connected with the A phase 40. At this time, the solid-state switch corresponding to the A phase 40 is turned on to make the moving contact connected with the A phase 40;

[0045] (3) Figure 3 As shown, at this time, the moving contact 30 only contacts one auxiliary contact 112 of the A phase 40, and the solid-state switch corresponding to the A phase 40 is turned on, so that the moving contact is turned on with the A phase 40;

[0046] (4) Figure 4 As shown, at this time, the moving contact 30 only contacts one auxiliary contact 112 of the A phase 40 and one auxiliary contact 112 of the adjacent B phase 50, and only the solid-state switch corresponding to the A phase 40 is turned on, so that the moving contact is turned on with the A phase 40;

[0047] (5) Figure 5 As shown, at this time, the moving contact 30 only contacts one auxiliary contact 112 of the A phase 40 and one auxiliary contact 112 of the adjacent B phase 50, and only the solid-state switch corresponding to the B phase 50 is turned on, so that the moving contact 30 is turned on with the B phase 50;

[0048] (6) Figure 6 As shown, at this time, the moving contact 30 only contacts one auxiliary contact 112 of the B phase 50, and the solid-state switch corresponding to the B phase 50 is turned on, so that the moving contact is turned on with the B phase 50;

[0049] (6) Figure 6 As shown, at this time, the moving contact 30 only contacts one auxiliary contact 112 of the B phase 50, and the solid-state switch corresponding to the B phase 50 is turned on, so that the moving contact is turned on with the B phase 50;

[0050] (2) Figure 2 As shown, at this time, the moving contact 30 only contacts the main contact 111 and one auxiliary contact 112 of the B phase 50 to be connected with the B phase 50. At this time, the solid-state switch corresponding to the B phase 50 is turned on to make the moving contact connected with the B phase 50;

[0051] (8) Figure 8 As shown, at this time, the movable contact 30 only contacts the main contact 111 of the B phase 50 to be conductive with the B phase 50 .

[0052] The above switching process takes 240ms. The above switching process is carried out at a uniform speed. The time of each stage (1) is 0ms, the time of each stage (2) is 10ms, the time of each stage (3) is 70ms, the time of each stage (3) is 90ms, the time of each stage (4) is 120ms, the time of each stage (5) is 150ms, the time of each stage (6) is 170ms, the time of each stage (7) is 230ms, and the time of each stage (8) is 240ms.

[0053] like Figures 1 to 8 As shown, the movable contact 30 includes a movable contact arc extending in the circumferential direction. When the movable contact 30 rotates in the circumferential direction, the accuracy of the movable contact 30 contacting and conducting with the contacts (main contacts 111 and auxiliary contacts 112) arranged in the circumferential direction is improved.

[0054] In this embodiment, the central angle of the moving contact 30 is greater than the central angle between two adjacent contact points on the stationary contact 10. When the moving contact 30 rotates in the circumferential direction, the moving contact 30 can always be in contact with at least one contact point, thereby preventing the moving contact 30 from breaking contact and reducing the power-off time of the switching process. Compared with some purely mechanical or semi-solid switching switches, the power-off time of the switching process can be extended.

[0055] Specifically, two adjacent contacts on the stationary contact 10 may be a main contact 111 and an auxiliary contact 112 disposed adjacently in the same stationary contact 10 , or may be two adjacent auxiliary contacts 112 disposed adjacently, and the two auxiliary contacts 112 belong to two adjacent stationary contacts 10 respectively.

[0056] In this embodiment, the central angle corresponding to the moving contact 30 is smaller than the central angle corresponding to three adjacent contact points on the stationary contact 10 .

[0057] In this embodiment, the central angles of any two adjacent contact points on the static contact 10 are equal, so that the A phase, the B phase and the C phase are arranged in a 120° circle, thereby achieving natural mechanical interlocking, avoiding the possibility of interphase short circuit, and facilitating batch processing.

[0058] Specifically, the equality of the central angles between any two adjacent contacts on the static contact 10 means that the central angle between the adjacent main contact 111 and the auxiliary contact 112 in the same static contact 10 is equal to the central angle between two adjacent auxiliary contacts 112 respectively belonging to two adjacent static contacts 10.

[0059] In this embodiment, the central angle corresponding to the movable contact 30 is greater than 60° and less than 80°. Specifically, the central angle corresponding to the movable contact 30 is 70°.

[0060] In this embodiment, the stationary contact 10 includes a stationary contact ring extending in the circumferential direction, and three stationary contact points 11 are arranged on the inner side wall of the stationary contact ring. By arranging the three stationary contact points 11 on the inner side wall of the stationary contact ring extending in the circumferential direction, it is convenient to quickly and accurately process to ensure that the three stationary contact points 11 are arranged in the circumferential direction, thereby improving the accuracy of the contact and conduction between the moving contact 30 and the stationary contact points 11 when the moving contact 30 rotates in the circumferential direction.

[0061] In this embodiment, the solid-state switch 23 includes a thyristor.

[0062] Another embodiment of the present invention provides an electric device, which includes the phase-changing switch provided above. The electric device provided by this embodiment is applied, wherein the main contact 111 is a contact that contacts the moving contact 30 during long-term normal working process, and the auxiliary contact 112 is a contact that is connected to the moving contact 30 for a short time during the switching process. The moving contact 30 rotates so that the moving contact 30 is selectively connected to phase A, phase B or phase C, so that phase A, phase B or phase C supplies power to the load. By setting the auxiliary contact 112, when the moving contact 30 rotates to switch the load power supply, the moving contact 30 is switched from the conducting state in which the main contact 111 corresponding to the current phase is connected to the second switching state in which the main contact 111 and the auxiliary contact 112 corresponding to the current phase are connected, and then to the first switching state in which the auxiliary contact 112 corresponding to the current phase is connected, and finally to the main contact 111 corresponding to the next phase. The switching is completed by adding an auxiliary contact 112. Since a solid-state switch 23 is provided on the auxiliary circuit 22, the moving contact 30 is prevented from directly switching between the conduction states of different main contacts 111 phases, and arcing is avoided during the switching process of the phase-changing switch, thereby reducing contact erosion of the phase-changing switch, extending the mechanical life of the phase-changing switch and the electrical life of the power equipment. In the case of a large amount of power equipment (low-voltage equipment), the cost of the phase-changing switch can also be reduced to meet the demand for energy-saving benefits over the entire life cycle.

[0063] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0064] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0065] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0066] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0067] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A phase-changing switch, characterized in that: The phase-changing switch comprises: A stationary contact (10) having three stationary contacts (11) arranged in a circumferential direction, each of the stationary contacts (11) comprising a main contact (111) and an auxiliary contact (112) arranged in the circumferential direction; Three phase circuits (20) corresponding to the three static contacts (11) one by one, the phase circuit (20) comprising a main circuit (21) and an auxiliary circuit (22), the first end of the main circuit (21) being connected to the first end of the auxiliary circuit (22), the second end of the main circuit (21) being connected to the main contact (111), the auxiliary circuit (22) being provided with a solid-state switch (23), the second end of the auxiliary circuit (22) being connected to the auxiliary contact (112); The moving contact (30) is rotatably arranged along the circumferential direction, and the moving contact (30) has a conducting state, a first switching state and a second switching state. When the moving contact (30) is in the conducting state, the moving contact (30) can selectively conduct with one of the three main contacts (111). When the moving contact (30) is in the first switching state, the moving contact (30) is conducted with the auxiliary contact (112). When the moving contact (30) is in the second switching state, the moving contact (30) is conducted with the adjacent main contact (111) and the auxiliary contact (112).

2. The phase-changing switch according to claim 1, characterized in that: Each of the stationary contacts (11) comprises two auxiliary contacts (112) arranged along the circumferential direction, the main contact (111) of the stationary contact (11) is arranged between the two auxiliary contacts (112) of the stationary contact (11), and the first switching state comprises: In a first sub-switching state, the movable contact (30) is connected to one of the auxiliary contacts (112); In the second sub-switching state, the moving contact (30) is connected to the two auxiliary contacts (112) of the two adjacent static contacts (11).

3. The phase-changing switch according to claim 2, characterized in that: The phase-changing switch further comprises a control element, the control element being connected to the solid-state switch (23) by a signal so as to control the solid-state switch (23) to be closed or opened, and the second sub-switching state comprises: In a first auxiliary conduction state, in the rotation direction of the moving contact (30), the solid-state switch (23) corresponding to the auxiliary contact (112) located upstream and conducted by the moving contact (30) is closed, and the solid-state switch (23) corresponding to the auxiliary contact (112) located downstream and conducted by the moving contact (30) is opened; In the second auxiliary conduction state, in the rotation direction of the moving contact (30), the solid-state switch (23) corresponding to the auxiliary contact (112) located upstream and conducted by the moving contact (30) is disconnected, and the solid-state switch (23) corresponding to the auxiliary contact (112) located downstream and conducted by the moving contact (30) is closed.

4. The phase-changing switch according to claim 2, characterized in that: The moving contact (30) comprises a moving contact arc extending along the circumferential direction.

5. The phase-changing switch according to claim 4, characterized in that: The center angle corresponding to the moving contact (30) is greater than the center angle corresponding to two adjacent contact points on the stationary contact (10).

6. The phase-changing switch according to claim 2, characterized in that: The center angle corresponding to the moving contact (30) is smaller than the center angle corresponding to three adjacent contact points on the stationary contact (10).

7. The phase-changing switch according to any one of claims 1 to 6, characterized in that: The central angles corresponding to any two adjacent contact points on the stationary contact (10) are equal.

8. The phase-changing switch according to any one of claims 1 to 6, characterized in that: The stationary contact member (10) comprises a stationary contact ring extending along the circumferential direction, and the three stationary contact points (11) are arranged on the inner side wall of the stationary contact ring.

9. The phase-changing switch according to any one of claims 1 to 6, characterized in that: The solid-state switch (23) comprises a thyristor.

10. An electric power device, characterized in that: The electric power equipment comprises the phase-changing switch according to any one of claims 1 to 9.

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