Phase change switch and power device having the same

Abstract

The application provides a commutating switch and a power device with the same, the commutating switch comprising: each static contact comprising a main contact and an auxiliary contact arranged along a circumferential direction; three phase circuits corresponding to the three static contacts one by one, the phase circuit comprising a main circuit and an auxiliary circuit, the first end of the main circuit being connected with the first end of the auxiliary circuit, the second end of the main circuit being connected with the main contact, the auxiliary circuit being provided with a solid-state switch, and the second end of the auxiliary circuit being connected with the auxiliary contact; when the moving contact is in a conduction state, the moving contact is selectively conductive with one of the three main contacts; when the moving contact is in a first switching state, the moving contact is conductive with the auxiliary contact; and when the moving contact is in a second switching state, the moving contact is conductive with the main contact and the auxiliary contact arranged adjacently. Through the technical scheme provided by the application, the problem that the commutating switch in the related art has arc in the switching process and causes serious ablation of the contacts of the commutating switch can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of commutation switch, in particular to a commutation switch and a power equipment with the same. BACKGROUND

[0002] The low-voltage distribution network in China adopts three-phase four-wire system, and it is difficult to avoid the problem of three-phase load imbalance caused by load. As early as the 1990s, the domestic has had a clear understanding of the harm of three-phase imbalance, and the harm of three-phase imbalance mainly includes: the increase of distribution transformer and line loss; the neutral point drift of Yyn0 type transformer, and the generation of large zero sequence voltage; the harm of negative sequence voltage to induction motor; unable to run at full capacity, and increase of overheating defects.

[0003] Among them, for three-phase current imbalance, the earliest SD292-1988 "Overhead Distribution Line and Equipment Operation Regulations" stipulates that the current imbalance of low-voltage distribution network should not be greater than 15%, and the zero line current of three-phase transformer with only a small amount of single-phase load should not exceed 25% of the rated current. Q / GDW1519-2014 "Distribution Network Operation and Maintenance Regulations" stipulates that the load imbalance of Yyn0 connection transformer should not be greater than 15%, and the zero line current should not be greater than 25% of the rated current of the transformer; the load imbalance of Dyn11 connection transformer should not be greater than 25%, and the zero line current should not be greater than 40% of the rated current of the transformer.

[0004] And for three-phase voltage imbalance in China, GB / T15543-1995 "Power Quality Three-Phase Voltage Imbalance" stipulates that the allowable value of normal voltage imbalance of power system public connection point is 2%, and the short time should not exceed 4%. However, this standard only considers the influence of unbalanced voltage on motor load, and the imbalance degree refers to negative sequence imbalance. The standard does not limit the zero sequence voltage, and until 2008, the standard adds the requirement for zero sequence voltage, that is, the limit value of zero sequence voltage of low-voltage system is not specified, but each phase voltage must meet the requirements of GB / T12325. GB / T12325 Power Quality Supply Voltage Deviation 4.3 stipulates that the single-phase supply voltage deviation of 220V is +7% of the nominal voltage, -10%.

[0005] The early domestic response measures for low-voltage three-phase imbalance mainly reflect in the design and management links, and there are few researches and applications of treatment devices, for example, in the design link, the distribution transformer is changed from Yyn0 to Dyn11 type, in the management link, the access capacity of single-phase users is reasonably distributed, the reasonable neutral line interface is selected, and the daily operation and maintenance commutation is strengthened.

[0006] After 2005, devices for three-phase imbalance treatment appeared one after another. First, three-phase partial compensation reactive power compensation devices appeared, which take the measures of connecting a number of power capacitors / inductors between phases and between each phase and neutral line, so as to not only compensate the power factor of each phase well, but also make the active current of each phase basically balanced. In 2011, Zibo Power Supply Company proposed a manually operated three-phase load imbalance adjustment switch, which shortens the switching operation outage from 3.5 hours to 2 minutes, and has a simple structure, forming the prototype of the phase-changing switch. Since 2015, a research and treatment boom of three-phase imbalance has been started in China, and the treatment methods are generally around three types of devices: 1) phase-changing switch type; 2) three-phase capacitor reactive power compensation type; 3) power electronic comprehensive treatment type, among which the latter two treatment technologies are often used to treat transformer three-phase current imbalance, and the phase-changing switch type technology can be used for global treatment of transformers and low-voltage lines, so the phase-changing switch type treatment technology has gradually become the main technology for three-phase imbalance treatment in recent years, and its research and application also show a trend of increasing year by year.

[0007] In the related art, with the trend of power distribution Internet of Things, the phase-changing switch is more intelligently monitored, and the phase-changing switch technology gradually becomes the only way to solve the low-voltage three-phase imbalance problem. Among them, the phase-changing switch includes a phase-changing switch applying STS (composed of an intelligent control board, a high-speed thyristor, and a circuit breaker) and a composite phase-changing switch (composed of power electronic devices and mechanical switches, wherein 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 quick switches), and the phase-changing switch currently researched and applied in China is generally a composite phase-changing switch.

[0008] However, the commutating switch in the related art has an arc in the switching process, and the contact of the commutating switch is seriously ablated. SUMMARY

[0009] The present application provides a phase-changing switch and a power device having the same, to solve the problem of the commutating switch in the related art having an arc in the switching process and the contact of the commutating switch being seriously ablated.

[0010] According to one aspect of the present application, a commutating switch is provided, the commutating switch comprising: a static contact having three static contact points arranged in a circumferential direction, each static contact point comprising a main contact point and an auxiliary contact point arranged in the circumferential direction; three phase circuits corresponding to the three static contact points respectively, each phase circuit comprising a main circuit and an auxiliary circuit, a first end of the main circuit being connected to a first end of the auxiliary circuit, a second end of the main circuit being connected to the main contact point, a solid state switch being arranged on the auxiliary circuit, and a second end of the auxiliary circuit being connected to the auxiliary contact point; and a moving contact rotatably arranged in the circumferential direction, the moving contact having a conducting state, a first switching state and a second switching state, the moving contact being selectively conductive with one of the three main contact points when the moving contact is in the conducting state, the moving contact being conductive with the auxiliary contact point when the moving contact is in the first switching state, and the moving contact being conductive with the main contact point and the auxiliary contact point arranged adjacently when the moving contact is in the second switching state.

[0011] Further, each static contact point comprises two auxiliary contact points arranged in the circumferential direction, the main contact point of the static contact point being arranged between the two auxiliary contact points, and the first switching state comprises: a first sub-switching state in which the moving contact is conductive with one auxiliary contact point; and a second sub-switching state in which the moving contact is conductive with the two auxiliary contact points of the two adjacent static contact points.

[0012] Further, the commutating switch further comprises a control member connected to the solid state switch in signal to control the solid state switch to be closed or opened, and the second sub-switching state comprises: a first auxiliary conducting state in which, in the rotation direction of the moving contact, the solid state switch corresponding to the upstream auxiliary contact point conductive to the moving contact is closed, and the solid state switch corresponding to the downstream auxiliary contact point conductive to the moving contact is opened; and a second auxiliary conducting state in which, in the rotation direction of the moving contact, the solid state switch corresponding to the upstream auxiliary contact point conductive to the moving contact is opened, and the solid state switch corresponding to the downstream auxiliary contact point conductive to the moving contact is closed.

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

[0014] Further, the central angle corresponding to the moving contact is greater than the central angle corresponding to any two adjacent contact points on the static contact.

[0015] Further, the central angle corresponding to the moving contact is less than the central angle corresponding to any three adjacent contact points on the static contact.

[0016] Further, the central angle corresponding to any two adjacent contact points on the static contact is equal.

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

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

[0019] According to another aspect of the present application, there is provided a power device comprising the commutation switch provided above.

[0020] According to the technical solution of the present application, the commutation switch comprises a static contact, a moving contact and three phase circuits, wherein the main contact is a contact that is in contact with the moving contact during a long-term normal working process, and the auxiliary contact is a contact that is connected with the moving contact for a short time during a switching process. The moving contact rotates to selectively make the moving contact conductive with the A phase, the B phase or the C phase, so as to supply power to the load by the A phase, the B phase or the C phase. By arranging the auxiliary contact, when the moving contact rotates to switch the power supply to the load, the moving contact is switched from a conductive state in which the moving contact is conductive with the main contact corresponding to the current phase, to a second switching state in which the moving contact is conductive with the main contact and the auxiliary contact corresponding to the current phase, to a first switching state in which the moving contact is conductive with the auxiliary contact corresponding to the current phase, and finally to a conductive state in which the moving contact is conductive with the main contact corresponding to the next phase, to complete the switching. In this process, by arranging the auxiliary contact and the solid-state switch in the auxiliary circuit, the moving contact is prevented from being switched directly between the conductive states in which the moving contact is conductive with different main contacts, and the commutation switch is prevented from generating an arc during the switching process, so as to reduce the ablation of the contacts of the commutation switch, and prolong the mechanical life of the commutation switch. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments of the present application illustrated in the drawings are intended to explain the present application and are not intended to limit the present application. In the drawings:

[0022] Figure 1 Fig. 1 shows a structure schematic diagram of a commutation switch when a moving contact is in a conductive state according to an embodiment of the present application;

[0023] Figure 2 Fig. 2 shows a structure schematic diagram of the commutation switch when the moving contact is in a second switching state according to an embodiment of the present application;

[0024] Figure 3 Fig. 3 shows a structure schematic diagram of the commutation switch when the moving contact is in a first sub-switching state according to an embodiment of the present application;

[0025] Figure 4 Fig. 4 shows a structure schematic diagram of the commutation switch when the moving contact is in a first auxiliary conductive state according to an embodiment of the present application;

[0026] Figure 5 Fig. 5 shows a structure schematic diagram of the commutation switch when the moving contact is in a second auxiliary conductive state according to an embodiment of the present application;

[0027] Figure 6Fig. 1 shows a structural schematic diagram of a commutator switch according to an embodiment of the present application, in which a moving contact is in a first sub-switching state;

[0028] Figure 7 Fig. 2 shows a structural schematic diagram of a commutator switch according to an embodiment of the present application, in which a moving contact is in a second sub-switching state;

[0029] Figure 8 Fig. 3 shows a structural schematic diagram of a commutator switch according to an embodiment of the present application, in which a moving contact is in a conducting state.

[0030] In the above drawings, the following reference signs are used:

[0031] 10, stationary contact; 11, stationary contact point; 111, main contact point; 112, auxiliary contact point;

[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 technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative work, are within the scope of protection of the present application.

[0035] As Figures 1 to 8As shown, the embodiment of the present application provides a commutating switch, the commutating switch comprising a static contact 10, a moving contact 30 and three phase circuits 20, the static contact 10 having three static contact points 11 arranged in a circumferential direction, each of the static contact points 11 comprising a main contact point 111 and an auxiliary contact point 112 arranged in a circumferential direction, the three phase circuits 20 corresponding to the three static contact points 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 point 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 point 112, the moving contact 30 being rotatably arranged in a circumferential direction, the moving contact 30 having 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 is selectively conductive with one of the three main contact points 111, when the moving contact 30 is in the first switching state, the moving contact 30 is conductive with the auxiliary contact point 112, when the moving contact 30 is in the second switching state, the moving contact 30 is conductive with the main contact point 111 and the auxiliary contact point 112 arranged adjacently.

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

[0037] By applying the commutating switch provided by the embodiment, the commutating switch comprises the static contact 10, the moving contact 30 and the three phase circuits 20, wherein the main contact point 111 is the contact point in contact with the moving contact 30 in the long-term normal working process, and the auxiliary contact point 112 is the contact point connected to the moving contact 30 for a short time in the switching process. The moving contact 30 rotates to selectively make the moving contact 30 conductive with the A phase, the B phase or the C phase, so as to make the A phase, the B phase or the C phase supply power to the load. By arranging the auxiliary contact point 112, when the moving contact 30 rotates to switch the power supply to the load, the moving contact 30 is switched from the conducting state of being conductive with the main contact point 111 corresponding to the current phase to the second switching state of being conductive with the main contact point 111 and the auxiliary contact point 112 corresponding to the current phase, to the first switching state of being conductive with the auxiliary contact point 112 corresponding to the current phase, and finally to the conducting state of being conductive with the main contact point 111 corresponding to the next phase, to complete the switching. In this process, by increasing the auxiliary contact point 112, since the auxiliary circuit 22 is provided with the solid-state switch 23, the moving contact 30 is prevented from being directly switched between the conducting states of being conductive with different main contact points 111, arc is avoided in the switching process of the commutating switch, the ablation of the contact points of the commutating switch is reduced, and the mechanical life of the commutating switch is prolonged.

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

[0039] like Figures 1 to 8 As shown, each stationary contact 11 includes two auxiliary contacts 112 arranged along the circumferential direction. The main contact 111 of the stationary contact 11 is located between the two auxiliary contacts 112 of the stationary contact 11. 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. 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 the two adjacent stationary contacts 11. Using the aforementioned stationary contact 11, when the moving contact 30 rotates to switch the load power supply, the moving contact 30 switches from a conducting state where it is connected to the main contact 111 corresponding to the current phase, to a second switching state where it is connected to both the main contact 111 and the auxiliary contact 112 corresponding to the current phase, then to a second sub-switching state where it is connected to both the auxiliary contact 112 corresponding to the current phase and the auxiliary contact 112 corresponding to the next phase, then to a first sub-switching state where it is connected to both the auxiliary contact 112 corresponding to the next phase, and finally to a second sub-switching state where it is connected to both the auxiliary contact 112 corresponding to the next phase. The switching process involves a second switching state where the main contact 111 and auxiliary contact 112 corresponding to one phase are connected, and finally a switching state where the main contact 111 corresponding to the next phase is connected, thus completing the switching. During this process, two auxiliary contacts 112 corresponding to the current phase and the next phase are used as transitions to prevent the moving contact 30 from contacting the main contact 111 corresponding to any phase when the moving contact 30 switches between two phases. This prevents the phase switching switch from generating an electric arc during the switching process, reduces contact erosion of the phase switching switch, and extends the mechanical life of the phase switching 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 stationary contact 11. The solid-state switch 23 is installed on the main circuit. The first end of each of the two branch circuits is electrically connected to the other end of the main circuit. The second end of each of the two branch circuits is electrically connected to the two auxiliary contacts 112 of the corresponding stationary contact 11.

[0041] like Figures 1 to 8As shown, the commutation switch also includes a control component, which is signal-connected to the solid-state switch 23 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 upstream auxiliary contact 112 connected by the moving contact 30 is closed, and the solid-state switch 23 corresponding to the downstream auxiliary contact 112 connected by the moving contact 30 is open. 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 upstream auxiliary contact 112 connected by the moving contact 30 is open, and the solid-state switch 23 corresponding to the downstream auxiliary contact 112 connected by the moving contact 30 is closed.

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

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

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

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

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

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

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

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

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

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

[0052] The switching process took 240ms. The switching process was carried out at a constant speed. The time of each stage (1) was 0ms, the time of each stage (2) was 10ms, the time of each stage (3) was 70ms, the time of each stage (4) was 90ms, the time of each stage (5) was 120ms, the time of each stage (6) was 150ms, the time of each stage (7) was 170ms, the time of each stage (8) was 230ms, and the time of each stage (9) was 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 contact and conduction between the movable contact 30 and the contacts (main contact 111 and auxiliary contact 112) arranged in the circumferential direction is improved.

[0054] In this embodiment, the central angle corresponding to the moving contact 30 is greater than the central angle between two adjacent contacts on the stationary contact 10. When the moving contact 30 rotates in the circumferential direction, it ensures that the moving contact 30 can always be in contact with at least one contact, preventing the moving contact 30 from breaking contact and reducing the power-off time during the switching process. Compared with some purely mechanical or semi-solid-state switching switches, it can extend the power-off time during the switching process.

[0055] Specifically, two adjacent contacts on the stationary contact 10 can be a main contact 111 and an auxiliary contact 112 that are adjacently arranged in the same stationary contact 10, or they can be two auxiliary contacts 112 that are adjacently arranged, with the two auxiliary contacts 112 belonging 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 between three adjacent contacts on the stationary contact 10.

[0057] In this embodiment, the central angles between any two adjacent contacts on the stationary contact 10 are equal. This results in a 120° circular arrangement between phases A, B, and C, achieving natural mechanical interlocking, preventing the possibility of phase-to-phase short circuits, and facilitating mass production.

[0058] Specifically, the equality of the central angles between any two adjacent contacts on the stationary contact 10 means that the central angles between the adjacent main contacts 111 and auxiliary contacts 112 in the same stationary contact 10 are equal to the central angles between the two auxiliary contacts 112 of the two adjacent stationary 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 disposed on the inner sidewall of the stationary contact ring. By disposing the three stationary contact points 11 on the inner sidewall of the stationary contact ring extending in the circumferential direction, it is convenient to quickly and accurately process and ensure that the three stationary contact points 11 are all arranged in the circumferential direction, thereby improving the accuracy of 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 a power device including the phase-changing switch provided above. In the power device provided in this embodiment, the main contact 111 is the contact that contacts the moving contact 30 during normal operation, and the auxiliary contact 112 is the contact that is briefly connected to the moving contact 30 during switching. The moving contact 30 rotates to selectively connect with phase A, phase B, or phase C, allowing phase A, phase B, or phase C to supply power to the load. By providing the auxiliary contact 112, when the moving contact 30 rotates to switch the load power supply, the moving contact 30 switches from a state where it is connected to the main contact 111 corresponding to the current phase, to a second switching state where it is connected to both the main contact 111 and the auxiliary contact 112 corresponding to the current phase, then to a first switching state where it is connected to the auxiliary contact 112 corresponding to the current phase, and finally to the main contact 112 corresponding to the next phase. The 11-phase conduction state is switched. During this process, by adding auxiliary contacts 112, and because solid-state switches 23 are installed on the auxiliary circuit 22, the moving contacts 30 are prevented from switching directly between the conduction states of different main contacts 111, thus avoiding the generation of electric arcs during the switching process of the phase-changing switch, reducing the contact erosion of the phase-changing switch, and extending the mechanical life of the phase-changing switch and the electrical life of the power equipment. In the case of a large number of power equipment (low-voltage equipment), the cost of the phase-changing switch can also be reduced to meet the needs of energy-saving benefits throughout the entire life cycle.

[0063] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0064] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0065] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

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

[0067] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0068] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A commutation switch, characterized in that, The commutation switch includes: The stationary contact (10) has three stationary contacts (11) arranged in a circumferential direction, each of the stationary contacts (11) including a main contact (111) and an auxiliary contact (112) arranged in the circumferential direction. Three phase circuits (20) correspond one-to-one with the three stationary contacts (11). Each 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). A solid-state switch (23) is provided on the auxiliary circuit (22), and the second end of the auxiliary circuit (22) is connected to the auxiliary contact (112). A movable contact (30) is rotatably arranged along the circumferential direction. The movable contact (30) has a conducting state, a first switching state, and a second switching state. When the movable contact (30) is in the conducting state, the movable contact (30) can selectively conduct with one of the three main contacts (111). When the movable contact (30) is in the first switching state, the movable contact (30) conducts with the auxiliary contact (112). When the movable contact (30) is in the second switching state, the movable contact (30) conducts with the adjacent main contact (111) and the auxiliary contact (112). Each stationary contact (11) includes two auxiliary contacts (112) arranged along the circumferential direction. The main contact (111) of the stationary contact (11) is located between the two auxiliary contacts (112) of the stationary contact (11). The first switching state includes: In the first sub-switching state, the moving 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 stationary contacts (11); The commutation switch further includes a control element, which is signal-connected to the solid-state switch (23) to control the solid-state switch (23) to close or open. The second sub-switching state includes: In the first auxiliary conduction state, in the rotation direction of the moving contact (30), the solid-state switch (23) corresponding to the upstream auxiliary contact (112) conducted by the moving contact (30) is closed, and the solid-state switch (23) corresponding to the downstream auxiliary contact (112) conducted by the moving contact (30) is open. In the second auxiliary conduction state, in the rotation direction of the moving contact (30), the solid-state switch (23) corresponding to the upstream auxiliary contact (112) conducted by the moving contact (30) is open, and the solid-state switch (23) corresponding to the downstream auxiliary contact (112) conducted by the moving contact (30) is closed.

2. The commutation switch according to claim 1, characterized in that, The movable contact (30) includes a movable contact arc extending along the circumferential direction.

3. The commutation switch according to claim 2, characterized in that, The central angle corresponding to the moving contact (30) is greater than the central angle between two adjacent contacts on the stationary contact (10).

4. The commutation switch according to claim 1, characterized in that, The central angle corresponding to the moving contact (30) is smaller than the central angle between three adjacent contacts on the stationary contact (10).

5. The commutation switch according to any one of claims 1 to 4, characterized in that, The central angles between any two adjacent contacts on the stationary contact (10) are equal.

6. The commutation switch according to any one of claims 1 to 4, characterized in that, The stationary contact (10) includes a stationary contact ring extending along the circumferential direction, and three stationary contact points (11) are disposed on the inner sidewall of the stationary contact ring.

7. The commutation switch according to any one of claims 1 to 4, characterized in that, The solid-state switch (23) includes a thyristor.

8. An electrical device, characterized in that, The power equipment includes a phase-switching switch as described in any one of claims 1 to 7.

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