Three-position switch and ring main unit

Abstract

The utility model provides a three-position switch and a ring main unit, the three-position switch comprises a first fixed seat and a plurality of grounding contacts, each grounding contact corresponds to one phase in a power supply network, and the plurality of grounding contacts are arranged on the first fixed seat; the grounding shielding base is arranged on the first fixing base, the grounding shielding base is configured to be an integrally-formed metal piece, a plurality of open holes are formed in the grounding shielding base, and the grounding contacts are exposed out of the corresponding open holes; each second fixing seat is correspondingly provided with an isolation static contact. And a plurality of moving contacts are arranged on the third fixed seat at intervals, and the moving contacts can rotate relative to the third fixed seat so as to be electrically connected with the grounding contact or the isolation static contact selectively. By optimizing the electric field of the three-position switch, the three-position switch can have a better insulation level, and the overall size of the three-position switch is reduced. Furthermore, the three-position switch can be applied to a small-size ring main unit with space limitation and higher insulation requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of ring network cabinets, and mainly relates to a three-position switch and a ring network cabinet. Background Art

[0002] In switchgear, SF6 gas insulation is usually used for the disconnection of switchgear due to its good insulation and arc extinguishing properties. However, as a greenhouse gas, the use of SF6 is not conducive to environmental development. In the prior art, there is also the use of dry air, which is more economical and environmentally friendly, as an insulating gas. However, this often requires the switchgear to have a larger insulating space, so that the prepared switchgear is often larger in size. For small-sized switchgear, especially medium and high voltage switchgear, switchgear using air as insulating gas is still difficult to meet the insulation requirements of the switchgear. Utility Model Content

[0003] In order to solve the problem that the switch equipment of the small-sized medium and high voltage switch cabinet designed using air as the insulating gas in the current related technology does not meet the insulation requirements, a three-position switch and a ring network cabinet are provided.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] In one aspect, the present application discloses a three-position switch, comprising:

[0006] A first fixing seat and a plurality of grounding contacts, each of the grounding contacts corresponds to a phase in the power supply network, and the plurality of grounding contacts are arranged on the first fixing seat;

[0007] A grounding shielding seat, arranged on the first fixing seat, the grounding shielding seat is configured as an integrally formed metal part, a plurality of openings are opened on the grounding shielding seat, and each of the grounding contacts is exposed from the corresponding opening;

[0008] A plurality of second fixing seats and a plurality of isolating static contacts, each of the second fixing seats being provided with a corresponding isolating static contact;

[0009] A third fixed seat and a plurality of moving contacts, wherein the plurality of moving contacts are arranged at intervals on the third fixed seat, and the moving contacts can rotate relative to the third fixed seat to selectively electrically connect with the grounding contact or the isolating static contact.

[0010] Optionally, the grounding shielding seat is an arched plate formed by bending a metal part, the arched plate and the first fixed seat enclose a first shielding space, the grounding contacts are distributed at intervals in the first shielding space, and the grounding contacts are exposed through an opening of the arched plate.

[0011] Optionally, each of the second fixing seats is connected to a circuit breaker, the second fixing seats are integrally formed of metal, the second fixing seats enclose a second shielding space, the isolating static contact is located in the second shielding space, and the isolating static contact is electrically connected to the circuit breaker through the second fixing seat.

[0012] Optionally, the second fixing seat includes a connecting portion and bent side portions located on both sides of the connecting portion, the bent side portions are arranged opposite to each other, the connecting portion and the bent side portions enclose the second shielding space, an opening is formed between the ends of the two bent side portions away from the connecting portion, the opening is set downward, the opening can allow the moving contact to extend into the second shielding space, and the connecting portion is used to be fixed on the corresponding circuit breaker.

[0013] Optionally, the connection between the connecting portion and the bent side portion is an arc transition.

[0014] Optionally, the top angle of the end of the bent side portion away from one end of the connecting portion is configured as an arc chamfer.

[0015] Optionally, the moving contact includes a middle part and a first end and a second end located at both ends of the middle part, the second end is rotatably arranged on the third fixed seat, the middle part is used for transmission connection with the three-position operating mechanism, and the first end can rotate around the second end when driven by the three-position operating mechanism.

[0016] Optionally, the first end is provided with a first shielding cover, the first shielding cover is used to make the electric field of the first end uniform, and the first shielding cover can extend into the second fixing seat or the grounding shielding seat as the first end rotates.

[0017] Optionally, the first shielding cover includes two first shielding plates that are oppositely arranged, and the first shielding plates are located on opposite sides of the first end of the moving contact.

[0018] Optionally, the outer surface of the first shielding plate is an arc surface.

[0019] Optionally, a plurality of the moving contacts are arranged in intervals, and a second shielding cover is provided at the connection between the second end of each moving contact and the third fixing seat.

[0020] The second aspect of the present application discloses a ring network cabinet, including a cabinet body, and at least one three-position switch and a three-position operating mechanism as described in any of the above embodiments arranged in the cabinet body, wherein the three-position operating mechanism is connected to the moving contact of the three-position switch, and the three-position operating mechanism can drive the moving contact of the three-position switch to rotate.

[0021] Beneficial effects:

[0022] The present application discloses a three-position switch and a ring network cabinet. The three-position switch includes a first fixed seat and a plurality of grounding contacts arranged on the first fixed seat. The grounding shielding seat is configured as an integrally formed metal part, and the plurality of grounding contacts are uniformly wrapped together. Each grounding contact is exposed from a corresponding opening so that the moving contact is connected to the grounding contact. In this way, the grounding shielding seat can optimize the electric field distribution of the grounding contact and enhance the insulation performance. Furthermore, the metal material of the grounding shielding seat can have a good electromagnetic shielding effect on the grounding contact. Compared with the single-phase separately shielded grounding contact, the risk of electrical failure at the assembly or connection part can be reduced. At the same time, the structure of one side of the grounding contact is made more compact, reducing the overall size of the three-position switch. Moreover, the three-position switch can also be used in a small-sized ring network cabinet with space limitations, and at the same time, it can meet the higher insulation requirements of the small-sized ring network cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A three-position switch according to an embodiment of the present application is shown in FIG.

[0024] Figure 2 This is a left side view of a three-position switch according to an embodiment of the present application;

[0025] Figure 3 This is a schematic diagram of the connection between the first fixing seat, the grounding contact and the grounding shielding seat according to an embodiment of the present application;

[0026] Figure 4 FIG. 1 is a schematic diagram of a second fixing base according to an embodiment of the present application.

[0027] The corresponding relationship between the reference numerals and the component names is as follows:

[0028] 1 first fixing seat;

[0029] 2 grounding contacts;

[0030] 3 grounding shielding seat, 301 opening, 302 first shielding space;

[0031] 4 second fixing seat, 401 second shielding space, 41 connecting portion, 42 bending side portion;

[0032] 5. Isolation static contact;

[0033] 6 third fixed seat;

[0034] 7 moving contact, 71 middle portion, 72 first end, 73 second end;

[0035] 8 a first shielding cover;

[0036] 9 Second shielding cover. DETAILED DESCRIPTION

[0037] The utility model provides a three-position switch and a ring main unit. In order to make the purpose, technical solution and effect of the utility model clearer and more specific, the utility model is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the protection scope of the utility model.

[0038] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] Traditional ring main units usually use SF6 gas insulation. SF6 gas has good insulation and arc extinguishing performance, but as a greenhouse gas, it is not conducive to environmental development. Based on this, the existing ring main unit uses air insulation, which is more in line with the development concept of green environmental protection.

[0041] Those skilled in the art will understand that the smaller the volume of the ring main unit, the weaker the insulation performance. In particular, in the process of miniaturizing the ring main unit that uses dry air as the insulating gas, it is necessary to take into account the insulation performance of the cabinet while reducing the cabinet volume.

[0042] Therefore, for small-sized ring main units, especially for the design of medium and high voltage ring main units, it is necessary to further improve the insulation performance inside the cabinet. Among them, the three-position switch is a key component of the switch cabinet. The operation of the three-position switch involves three states: connection, isolation and grounding. Due to its functional diversity and operational complexity, the three-position switch may face higher voltage and electric field strength during operation. However, the current three-position switch is difficult to meet the insulation requirements of the switch cabinet that uses dry air as the insulating gas due to the lack of optimized design of the electric field.

[0043] The present application discloses a ring network cabinet, comprising a cabinet body, a three-position switch and a three-position operating mechanism arranged in the cabinet body. The three-position operating mechanism is transmission-connected to a moving contact 7 of the three-position switch. Under the drive of the three-position operating mechanism, the moving contact 7 of the three-position switch can be selectively electrically connected to an isolating static contact 5 or a grounding contact 2 by rotating.

[0044] Generally, a three-position switch has three different working states. It can be understood that the three-position switch integrates the functions of the isolating switch and the grounding switch, and the same moving contact 7 is used to complete the functions of the two. In this way, mechanical locking can be achieved to prevent the main circuit from being energized and closing the grounding switch. Among them, the three working states of the three-position switch include the closing position where the moving contact 7 is connected to the isolating switch, that is, the moving contact 7 is in a position electrically connected to the isolating static contact 5; the grounding position with the grounding side, that is, the moving contact 7 is in a position electrically connected to the grounding static contact; and the isolating position where the main break is separated, that is, the moving contact 7 is in a state of being disconnected from both the isolating static contact 5 and the grounding static contact.

[0045] Please see attached Figure 1 To Attachment Figure 4 The three-position switch includes a first fixed seat 1, a grounding contact 2, a grounding shielding seat 3, a second fixed seat 4, an isolating static contact 5, a third fixed seat 6 and a moving contact 7.

[0046] There are multiple grounding contacts 2 , each of which corresponds to a phase in the power supply network, and the multiple grounding contacts 2 are all arranged on the first fixing seat 1 .

[0047] The first fixing base 1 is installed on the cabinet body of the ring main unit. Figure 1 and Figure 2 As shown, three grounding contacts 2 are arranged on the first fixing seat 1, and the three grounding contacts 2 correspond to three phases in the power supply network respectively.

[0048] In detail, the first fixing seat 1 can be made of a conductive metal member, so that the first fixing seat 1 can ground the grounding static contacts of multiple phases through the same path.

[0049] Please see attached Figure 2 The ground shielding seat 3 is disposed on the first fixing seat 1 . The ground shielding seat 3 is configured as an integrally formed metal member. A plurality of openings 301 are formed on the ground shielding seat 3 . Each grounding contact 2 is exposed from a corresponding opening 301 .

[0050] Specifically, the grounding shielding seat 3 can be formed by an integrated sheet metal, and the three-phase grounding contact 2 can be uniformly wrapped by the same piece of metal, which can evenly distribute the electric field of the grounding contact 2 and reduce the risk of excessive local electric field; moreover, the metal material of the grounding shielding seat 3 can have a good electromagnetic shielding effect on the grounding contact 2, reducing the risk of electric field diffusion during the electrical connection between the moving contact 7 and the grounding contact 2, which is beneficial to the electrical stability of the three-position switch.

[0051] Furthermore, compared with the single-phase grounding contact 2 in the prior art that is individually shielded, the grounding shielding seat 3 is formed in one piece with metal parts, which can reduce the manufacturing and installation costs and reduce the assembly and welding processes. The traditional single-phase individual shielding may easily increase the risk of electrical failure due to assembly or connection problems. The integrated design of the grounding shielding seat 3 reduces this risk and improves the insulation performance and reliability of the three-position switch.

[0052] Considering the overall size of the three-position switch, the integrated grounding shielding seat 3 can wrap the grounding contact 2 more compactly, which is conducive to reducing the overall size of the three-position switch, making the structure more compact and suitable for small-sized switch cabinets.

[0053] Please see attached Figure 2 and attached Figure 3 The grounding shielding seat 3 is an arched plate formed by bending a metal part. The arched plate and the first fixed seat 1 enclose a first shielding space 302. The grounding contacts 2 are distributed in the first shielding space 302 at intervals, and the grounding contacts 2 are exposed through the opening 301 of the arched plate.

[0054] The arched plate is formed by bending a metal piece, and the preparation process of the grounding shielding seat 3 is relatively simple and the cost is relatively low.

[0055] Specifically, as attached Figure 3 As shown, both sides of the arch plate along the length direction are connected to the first fixing base 1 , and the arch plate and the first fixing base 1 enclose a first shielding space 302 , which can achieve a uniform electric field effect for the three-phase grounding contacts 2 .

[0056] Please see attached Figure 1 The three-position switch includes a plurality of second fixed seats 4 and a plurality of isolating static contacts 5 , and each second fixed seat 4 is correspondingly provided with an isolating static contact 5 .

[0057] Each second fixing seat 4 is connected to the circuit breaker, and the isolating static contact 5 is connected to the circuit breaker through the second fixing seat 4. Specifically, the three poles of the circuit breaker correspond to the three phases in the power supply network, and the isolating static contact 5 arranged on the second fixing seat 4 is electrically connected to the static end of the corresponding pole.

[0058] Please see attached Figure 4The second fixing base 4 is an integrally formed metal, and the second fixing base 4 encloses a second shielding space 401 . The isolating static contact 5 is located in the second shielding space 401 , and the isolating static contact 5 is electrically connected to the circuit breaker through the second fixing base 4 .

[0059] The second fixing seat 4 includes a connecting portion 41 and bent side portions 42 located on both sides of the connecting portion 41 . The bent side portions 42 are arranged opposite to each other. The connecting portion 41 and the bent side portions 42 enclose a second shielding space 401 . The connecting portion 41 is used to be fixed on a corresponding circuit breaker.

[0060] like Figure 4 As shown, the two bent side portions 42 are arranged on opposite sides of the isolating static contact 5, which can provide electrical isolation for the isolating static contact 5, so that the electric field between the three phases of the circuit breaker is isolated and the insulation performance is improved.

[0061] An opening is formed between the two bent side portions 42 at one end away from the connecting portion 41, and the opening is set downward. The opening can allow the moving contact 7 to extend into the second shielding space 401. In this way, when the moving contact 7 is connected to the isolating static contact 5 and is in the closed position when the isolating switch is turned on, the electric field can be evenly distributed in the second shielding space 401 enclosed by the bent side portions 42 and the connecting portion 41, thereby improving the electric field distribution at the electrical connection between the moving contact 7 and the isolating static contact 5.

[0062] Furthermore, the connection between the connecting portion 41 and the bent side portion 42 is an arc transition. In this way, the transition surface of the connection between the connecting portion 41 and the bent side portion 42 that enclose the second shielding space 401 is an arc surface, which can reduce the sudden change of the electric field at the connection between the connecting portion 41 and the bent side portion 42, and further optimize the electric field distribution in the second shielding space 401.

[0063] Furthermore, the end vertex of the bent side portion 42 away from the connecting portion 41 is configured as an arc chamfer. In this way, the risk of the second fixing seat 4 forming a sharp tip and easily causing electric field concentration can be reduced, and the isolation of the static contact 5 can be better optimized in the electric field.

[0064] As attached Figure 1 As shown, a plurality of moving contacts 7 are arranged at intervals on the third fixing seat 6 , and the moving contacts 7 can rotate relative to the third fixing seat 6 to selectively be electrically connected to the grounding contact 2 or the isolating static contact 5 .

[0065] The moving contact 7 includes a middle portion 71 and a first end 72 and a second end 73 located at both ends of the middle portion 71. The second end 73 is rotatably arranged on the third fixed seat 6. The middle portion 71 is used for transmission connection with the three-position operating mechanism. The first end 72 can rotate around the second end 73 driven by the three-position operating mechanism.

[0066] As attached Figure 1As shown, three moving contacts 7 are arranged at intervals on the third fixed seat 6, and the middle portion 71 of the moving contact 7 drives the two ends of the moving contact 7 to rotate through a transmission connection with the three-position operating mechanism. Among them, the first end 72 of the moving contact 7 serves as a fixed end and is rotatably connected to the third fixed seat 6, and the second end 73 of the moving contact 7 serves as a free end and rotates around the rotation connection point between the moving contact 7 and the third fixed seat 6.

[0067] Specifically, the second end 73 of the moving contact 7 can be rotated clockwise to the grounding shielding seat 3, and extend into the first shielding space 302 through the opening 301 of the grounding shielding seat 3, and connect with the grounding contact 2 located in the first shielding space 302; the second end 73 of the moving contact 7 can be rotated counterclockwise to the second fixed seat 4, and extend into the second shielding space 401 through the opening of the second fixed seat 4, and connect with the isolating static contact 5 located in the second shielding space 401. In this way, the three-position switch disclosed in the present application can optimize the electric field at the electrical connection positions of the moving contact 7 and the grounding contact 2 and the isolating static contact 5, reduce the risk of electric field interference between multiple phases or other external electromagnetic field interference, thereby improving the insulation level of the three-position switch.

[0068] As attached Figure 1 and Figure 2 As shown, the first end 72 is provided with a first shielding cover 8, which is used to make the electric field of the first end 72 uniform, and the first shielding cover 8 can extend into the second fixing seat 4 or the grounding shielding seat 3 as the first end 72 rotates.

[0069] The first shielding cover 8 includes two oppositely arranged shielding plates, which are located on opposite sides of the first end 72 of the moving contact 7, so that the connection between the first end 72 of the moving contact 7 and the second fixed seat 4 is located in the space surrounded by the oppositely arranged shielding plates, thereby exerting a uniform electric field on the first end 72 of the moving contact 7.

[0070] Specifically, the outer surface of the first shielding plate is an arc surface. Figure 2 As shown, the first shielding plate can be designed as a hemispherical shape. In this way, the arc surface of the outer surface of the first shielding plate can reduce the risk of high-intensity electric field areas easily formed due to sharp edges or right-angle areas, thereby achieving the purpose of uniform electric field.

[0071] A plurality of moving contacts 7 are arranged in an interval arrangement along the same row, and a second shielding cover 9 is provided at the connection between the second end 73 of each moving contact 7 and the third fixing seat 6 .

[0072] Specifically, the second shielding cover 9 includes two oppositely arranged second shielding plates, which are located on opposite sides of the second end 73 of the moving contact 7, so that the second end 73 of the moving contact 7 is located in the space enclosed by the oppositely arranged shielding plates to improve the electric field distribution at the second end 73 of the moving contact 7.

[0073] Furthermore, the outer surface of the second shielding plate of the second shielding cover 9 is an arc surface, which further improves the uniformity of the electric field of the second shielding cover 9 on the second end 73 of the moving contact 7 .

[0074] In general, the three-position switch disclosed in the present application is equipped with an integrally formed grounding shielding seat 3, and the grounding contacts 2 of multiple phases are uniformly wrapped in the first shielding space 302 enclosed by the grounding shielding seat 3 and the first fixed seat 1, so as to evenly distribute the electric field of the grounding contacts 2. Compared with single-phase separate shielding, it has the advantages of compact structure and better electric field optimization effect, and reduces the size and occupied space of the three-position switch; a second fixed seat 4 is arranged at the isolating static contact 5, and the second shielding space 401 formed by the second fixed seat 4 can play a role in uniform electric field for isolating the static contact 5; further, a first shielding cover 8 is arranged at the first end 72 of the moving contact 7, and a second shielding cover 9 is respectively arranged at the second end 73 of the moving contact 7, and the first shielding cover 8 and the second shielding cover 9 can respectively play a role in optimizing the electric field at both ends of the moving contact 7.

[0075] It can be understood that the three-position switch technical solution of the present application optimizes the electric field of the grounding contact, the isolating static contact and the moving contact, so that the electric field at each position of the three-position switch can be evenly distributed when the three-position switch is in each state of connection, isolation and grounding, reducing the risk of breakdown caused by electric field concentration, thereby effectively improving the insulation level of the three-position switch, so that it can be used in smaller ring network cabinets to meet higher insulation requirements.

[0076] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and the utility model concept of the utility model, and all these changes or substitutions should fall within the protection scope of the utility model.

Claims

1. A three-position switch, characterized in that: include: A first fixing seat and a plurality of grounding contacts, each of the grounding contacts corresponds to a phase in the power supply network, and the plurality of grounding contacts are arranged on the first fixing seat; A grounding shielding seat, arranged on the first fixing seat, the grounding shielding seat is configured as an integrally formed metal part, a plurality of openings are opened on the grounding shielding seat, and each of the grounding contacts is exposed from the corresponding opening; A plurality of second fixing seats and a plurality of isolating static contacts, each of the second fixing seats being provided with a corresponding isolating static contact; A third fixed seat and a plurality of moving contacts, wherein the plurality of moving contacts are arranged at intervals on the third fixed seat, and the moving contacts can rotate relative to the third fixed seat to selectively electrically connect with the grounding contact or the isolating static contact.

2. The three-position switch according to claim 1, characterized in that: The grounding shielding seat is an arched plate formed by bending a metal piece. The arched plate and the first fixing seat enclose a first shielding space. The grounding contacts are distributed at intervals in the first shielding space, and the grounding contacts are exposed through openings of the arched plate.

3. The three-position switch according to claim 1 or 2, characterized in that: Each of the second fixing seats is connected to the circuit breaker, the second fixing seats are integrally formed metal, the second fixing seats enclose a second shielding space, the isolating static contact is located in the second shielding space, and the isolating static contact is electrically connected to the circuit breaker through the second fixing seat.

4. The three-position switch according to claim 3, characterized in that: The second fixing seat includes a connecting portion and bent side portions located on both sides of the connecting portion, the bent side portions are arranged opposite to each other, the connecting portion and the bent side portions enclose the second shielding space, an opening is formed between the ends of the two bent side portions away from the connecting portion, the direction of the opening is set downward, the opening can allow the moving contact to extend into the second shielding space, and the connecting portion is used to be fixed on the corresponding circuit breaker.

5. The three-position switch according to claim 4, characterized in that: The connection between the connecting portion and the bent side portion is an arc transition.

6. The three-position switch according to claim 4, characterized in that: The top angle of the end of the bent side portion away from one end of the connecting portion is configured as an arc chamfer.

7. The three-position switch according to claim 1 or 2, characterized in that: The moving contact comprises a middle portion and a first end and a second end located at both ends of the middle portion, the second end is rotatably arranged on the third fixed seat, the middle portion is used for transmission connection with the three-position operating mechanism, and the first end can rotate around the second end under the drive of the three-position operating mechanism; The first end is provided with a first shielding cover, which is used to make the electric field of the first end uniform, and the first shielding cover can extend into the second fixing seat or the grounding shielding seat as the first end rotates.

8. The three-position switch according to claim 7, characterized in that: The first shielding cover comprises two first shielding plates arranged opposite to each other, wherein the first shielding plates are located on opposite sides of the first end of the moving contact; The outer surface of the first shielding plate is an arc surface.

9. The three-position switch according to claim 7, characterized in that: The plurality of moving contacts are arranged in an interval arrangement, and a second shielding cover is provided at the connection between the second end of each moving contact and the third fixing seat.

10. A ring main unit, characterized in that: include: Cabinet; Any one of the three-position switch and three-position operating mechanism as described in claims 1 to 9 is arranged in the cabinet, the three-position operating mechanism is connected to the moving contact of the three-position switch, and the three-position operating mechanism can drive the moving contact of the three-position switch to rotate.

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