Switchgear cabinet
By introducing a first arc contact and a second arc contact into the grounding switch and using current-resistant and arc-resistant metal materials, the problems of welding and contact burn-out during the closing process of the grounding switch are solved, achieving higher closing reliability and service life.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- XIAMEN HUADIAN SWITCHGEAR
- Filing Date
- 2025-02-21
- Publication Date
- 2026-07-30
AI Technical Summary
Grounding switches are prone to problems such as "fusion welding" and "contact burn-out" during the closing process, resulting in weak closing capability.
A first arc contact and a second arc contact are introduced into the grounding switch. When the moving contact rotates, it first contacts the second arc contact to conduct electricity, thus pre-transferring the arc. Then the moving contact contacts the grounding contact. A stable conductive circuit is formed by using a metal material that is resistant to current and arc.
It effectively reduces the risk of arc burns and corrosion to grounding contacts and moving contacts, extends service life, and improves the closing reliability of grounding switches.
Smart Images
Figure CN2025078446_30072026_PF_FP_ABST
Abstract
Description
switch cabinet
[0001] This application claims priority to Chinese Patent Application No. 2025101187530, filed on January 24, 2025, and Chinese Patent Application No. 2025201712914, filed on January 24, 2025, the entire contents of which are incorporated herein by reference. Technical Field
[0002] This disclosure relates to the field of switchgear technology, and mainly to a switchgear. Background Technology
[0003] Grounding switches are the most widely used switching devices in power distribution systems, used to protect personnel and equipment safety. Under normal circumstances, grounding switches ensure reliable grounding of electrical equipment during maintenance, protecting the safety of operation and maintenance personnel and equipment. Under abnormal conditions (such as short circuits), grounding switches have the ability to carry short-circuit current for a specified time.
[0004] During the closing process, the grounding switch experiences a short-circuit current of up to tens of kiloamperes. The current repulsion force generated by this huge instantaneous current has a significant impact on the reliable closing of the grounding switch, making it prone to "welding" and "contact burn-out" during the closing process, resulting in a weak closing capacity. Summary of the Invention
[0005] This application provides a switchgear with a simple structure that can improve the grounding closing capability, thereby addressing the problem of weak grounding switch closing capability.
[0006] According to one aspect of this application, a switch cabinet is provided, comprising: a cabinet body; a grounding copper busbar disposed within the cabinet body for connection to a grounding device; a grounding contact disposed within the cabinet body and electrically connected to the grounding copper busbar; a moving contact disposed within the cabinet body and rotatable relative to the cabinet body; a first arc contact connected to the moving contact, such that when the moving contact rotates, the first arc contact can move with the moving contact; and a second arc contact electrically connected to the grounding copper busbar, the second arc contact being located on one side of the grounding contact; when the moving contact rotates in the direction of grounding and closing, the moving contact can drive the first arc contact to rotate, so that before the grounding contact and the moving contact make contact and conduct electricity, the first arc contact and the second arc contact make contact and conduct electricity.
[0007] This application discloses a switchgear, including a cabinet, a grounding copper busbar, a grounding contact, a moving contact, a first arc contact, and a second arc contact. By connecting the first arc contact to the moving contact and providing a second arc contact on one side of the grounding contact, when the moving contact rotates in the direction of grounding and closing, the moving contact can drive the first arc contact to rotate, so that the first arc contact and the second arc contact make contact and conduct electricity before the grounding contact and the moving contact make contact. In this way, before the moving contact and the grounding contact close, the first arc contact and the second arc contact can make contact and conduct electricity, thus acting as an arc generator. This allows the momentary current, which is short-lived when the moving contact and the grounding contact first make contact, to flow through the first arc contact and the second arc contact to the copper busbar. Then, as the moving contact rotates, it comes into contact with the grounding contact to conduct electricity. This effectively reduces the risk of the grounding and moving contacts being directly burned and corroded by the electric arc. After the grounding and moving contacts make effective contact, a stable current is conducted for a long time, protecting them from electric arc burns and corrosion. In this way, the contact conduction between the first and second arc contacts can pre-transfer the electric arc, protecting the main contacts, i.e., the grounding and moving contacts, from electric arc burns and corrosion. This effectively extends the service life of the grounding and moving contacts and improves the reliability of the entire switchgear's grounding and closing mechanism. Attached Figure Description
[0008] The above and / or additional aspects and features of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0009] Figure 1 is a schematic diagram of a switch cabinet according to some embodiments of this application;
[0010] Figure 2 is a partial schematic diagram of a switch cabinet according to some embodiments of this application;
[0011] Figure 3 is a cross-sectional schematic diagram of a switch cabinet according to some embodiments of this application;
[0012] Figure 4 is a schematic diagram of the grounding contact of a switchgear according to some embodiments of this application;
[0013] Figure 5 is a diagram showing the contact state between the first arc contact and the second arc contact according to some embodiments of this application;
[0014] Figure 6 is a schematic diagram of the contact between a first arc contact and a second arc contact according to some embodiments of this application;
[0015] Figure 7 is a diagram showing the contact state between the moving contact and the grounding contact according to some embodiments of this application;
[0016] Figure 8 is a schematic diagram of the contact between the moving contact and the grounding contact according to some embodiments of this application;
[0017] Figure 9 is a magnified view of part A in Figure 2.
[0018] Implementation of this disclosure
[0019] The embodiments of this application are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary.
[0020] Please refer to Figures 1 and 2. This application discloses a switch cabinet, including a cabinet body 1, a grounding copper busbar 12, a grounding contact 2, a moving contact 3, a first arc contact 4, a second arc contact 5, an operating mechanism 11, a first fixed base 13, and a second fixed base 14. The operating mechanism 11 is connected to the moving contact 3 by transmission. Under the drive of the operating mechanism 11, the moving contact 3 can be rotated to electrically connect to the grounding contact 2.
[0021] The grounding copper busbar 12 is located inside the cabinet 1. The grounding copper busbar 12 is connected to the grounding contact 2 and is used to connect to the grounding equipment. When the operating mechanism 11 drives the moving contact 3 to rotate, the moving contact 3 can make contact with the grounding contact 2 to conduct electricity, and the current passes through the grounding copper busbar 12 to connect to the grounding equipment.
[0022] The grounding copper busbar 12 is electrically connected to the second arc contact 5 so that when the moving contact 3 drives the first arc contact 4 to rotate in the direction of grounding and closing, the first arc contact 4 and the second arc contact 5 make contact and conduct electricity, and the current can flow to the grounding copper busbar 12.
[0023] Specifically, the second arc contact 5 is connected to the grounding contact 2, and the second arc contact 5 is electrically connected to the grounding copper busbar 12 through the grounding contact 2.
[0024] As shown in Figure 2, there are multiple grounding contacts 2, each grounding contact 2 corresponding to a phase in the power supply network, and all of the multiple grounding contacts 2 are mounted on the first fixed base 13.
[0025] Both the grounding contact 2 and the moving contact 3 are made of current-resistant metal materials. It is understood that current-resistant metal materials typically possess high conductivity and good current-carrying capacity. The use of a current-resistant metal material for the grounding contact 2 enables efficient current transmission and reduces energy loss during the grounding closing process. This allows the moving contact 3 and the grounding contact 2 to transmit current quickly and reliably during closing. Current-resistant metal materials can include copper and its alloys, silver and its alloys, etc.
[0026] As shown in Figure 2, the first mounting base 13 is installed on the cabinet 1 of the switchgear. Three grounding contacts 2 are arranged on the first mounting base 13, and the three grounding contacts 2 correspond to the three phases in the power supply network respectively.
[0027] The first fixing base 13 can be made of conductive metal, so that the first fixing base 13 can connect the grounding contacts 2 of multiple phases to the grounding copper busbar 12 through the same path.
[0028] As shown in Figures 3 and 4, the grounding contact 2 includes a second connecting portion 21 and a contact head 22. The second connecting portion 21 can extend along the length direction of the first fixing base 13, and the contact head 22 is vertically disposed on the second connecting portion 21.
[0029] Specifically, as shown in Figure 4, the grounding contact 2 is T-shaped. The second connecting part 21 corresponds to the upper horizontal part of the T-shape, and the contact head 22 corresponds to the lower vertical part of the T-shape. The second connecting part 21 can be fixedly connected to the first fixing base 13 by screws, bolts or other connecting parts, and multiple second connecting parts 21 are spaced apart along the length direction of the first fixing base 13.
[0030] The second arc contact 5 is electrically connected to the grounding copper busbar 12, and the second arc contact 5 is located on one side of the grounding contact 2.
[0031] The second arc contact 5 may be one. The second arc contact 5 is arranged adjacent to the grounding contact 2 so that when the moving contact 3 drives the first arc contact 4 to rotate, the first arc contact 4 and the second arc contact 5 can make contact and conduct electricity first, and the current flows to the grounding copper busbar 12.
[0032] The second arc contact 5 may include two, each disposed on opposite sides of the grounding contact 2. Specifically, each grounding contact 2 is provided with two second arc contacts 5. The second arc contacts 5 can be directly connected to the grounding contact 2. An opening 501 is formed between the two second arc contacts 5, allowing the moving contact 3 and the first arc contact 4 to extend into the side where the grounding contact 2 is located.
[0033] As shown in Figures 5 and 6, when the moving contact 3 rotates in the direction of grounding and closing, the moving contact 3 drives the first arc contact 4 to rotate. When the first arc contact 4 passes through the opening 501, it can contact the second arc contact 5 located on the same side, as shown in Figures 7 and 8. As the moving contact 3 continues to rotate in the direction of grounding and closing, the moving contact 3 can contact the grounding contact 2.
[0034] It should be noted that during the closing process of the grounding contact 2 and the moving contact 3, the presence of the electric field force can easily cause instability in the contact between the first arc contact 4 and the second arc contact 5, that is, the first arc contact 4 and the second arc contact 5 may not make effective contact. This application addresses this by setting second arc contacts 5 on opposite sides of the grounding contact 2, forming an opening 501 between the two second arc contacts 5. Both the moving contact 3 and the first arc contact 4 are located inside the second arc contacts 5, making the contact and conductivity process between the first arc contact 4 and the second arc contact 5 more reliable.
[0035] Because a short-circuit current of tens of kiloamperes is generated between the moving contact 3 and the grounding contact 2 at the instant of closing, the current repulsion force generated by the huge instantaneous current has a significant impact on the reliable closing of the grounding switch. Specifically, when the moving contact 3 and the grounding contact 2 first make contact, the electric field strength between the contacts is extremely high, which easily leads to the formation of an electric arc between the moving contact 3 and the grounding contact 2. This makes the moving contact 3 and the grounding contact 2 prone to problems such as "fusion welding" and "contact burn-out" due to the huge instantaneous current at the moment of contact.
[0036] In this application, a second arc contact 5 is provided on one side of the grounding contact 2. When the moving contact 3 rotates in the direction of grounding and closing, the moving contact 3 can drive the first arc contact 4 to rotate, so that the first arc contact 4 and the second arc contact 5 make contact and conduct electricity before the grounding contact 2 and the moving contact 3 make contact. In this way, before the moving contact 3 and the grounding contact 2 are closed, they can first make contact and conduct electricity through the first arc contact 4 and the second arc contact 5, thereby playing the role of arc initiation. This allows the short-lived instantaneous current that occurs when the moving contact 3 and the grounding contact 2 first make contact to be conducted through the first arc contact 4 and the second arc contact 5, and then flows to the copper busbar. Then, as the moving contact 3 rotates, the moving contact 3 makes contact and conduct electricity with the grounding contact 2, which can effectively reduce the risk of the grounding contact 2 and the moving contact 3 being directly subjected to the burn and erosion of the arc. Moreover, after the grounding contact 2 and the moving contact 3 make effective contact, a stable current is conducted for a long time, which can protect the grounding contact 2 and the moving contact 3 from the burn and erosion of the arc. In this way, the contact conductivity between the first arc contact 4 and the second arc contact 5 can transfer the arc in advance, so that the grounding contact 2 and the moving contact 3 are protected from arc burns and erosion, effectively extending the service life of the grounding contact 2 and the moving contact 3, and improving the reliability of the grounding and closing of the entire switch cabinet.
[0037] Both the second arc contact 5 and the first arc contact 4 are made of arc-resistant metal materials. It is understood that arc-resistant metal materials have high arc resistance, enabling the second arc contact 5 to effectively withstand arc impacts during electrical conduction with the first arc contact 4, reducing melting, ablation, or other forms of damage caused by the arc. Arc-resistant metal materials include copper alloys, silver alloys, tungsten alloys, aluminum alloys, chromium alloys, molybdenum alloys, and nickel alloys, among others.
[0038] In current grounding switches, the moving contact portion 52 mainly consists of a moving contact 3 and a grounding contact 2. The short-circuit current and short-time withstand current generated during the closing process are both borne by the moving contact 3 and the grounding contact 2. In this application, by using arc-resistant metal materials for both the second arc contact 5 and the first arc contact 4, the electrical connection circuit formed by the second arc contact 5 and the first arc contact 4 can more stably and reliably withstand the arc current, reducing the risk of burning and other arc damage to the second arc contact 5 and the first arc contact 4. Furthermore, the grounding contact 2 and the moving contact 3 are made of current-resistant metal materials, enabling the moving contact 3 and the grounding contact 2 to stably withstand long-term current and achieve good current conduction. In this way, the successively formed conductive circuit can be carried by correspondingly matched current-characteristic materials, thereby improving the closing capability of the grounding switch.
[0039] As shown in Figure 4, the second arc contact 5 is provided with a first surface 502 on the side facing the grounding contact 2. When the moving contact 3 rotates in the direction of grounding and closing, the first arc contact 4 can slide along the first surface 502 provided on the corresponding side.
[0040] Furthermore, the first surfaces 502 of the two second arc contacts 5 are spaced apart to form openings 501. When the moving contact 3 rotates in the direction of grounding and closing, the first arc contact 4 can slide along the first surface 502 provided on the corresponding side.
[0041] Thus, the opening 501 is formed by two opposing arc surfaces, allowing the moving contact 3 to slide along the corresponding arc surface and form a conductive circuit as it moves the first arc contact 4 toward the grounding contact 2. During this process, the sliding of the first arc contact 4 along the arc surface helps reduce friction between the two, thereby reducing mechanical impact during the contact between the first arc contact 4 and the second arc contact 5, resulting in a smoother contact.
[0042] Each grounding contact 2 has a second arc contact 5 on both sides to form multiple openings 501.
[0043] As shown in Figures 5 and 6, when the moving contact 3 rotates in the direction of grounding and closing, the second surface 401 of the first arc contact 4 can slide along the first surface 502 provided on the corresponding side.
[0044] As shown in Figure 6, the second arc contact 5 includes a first connecting portion 51 and a contact portion 52. The first connecting portions 51 of the two second arc contacts 5 are fixedly connected to the lateral sides of the grounding contact 2, respectively. One end of the contact portion 52 is connected to the first connecting portion 51, and the other end of the contact portion 52 extends toward the movement trajectory of the second arc contact 5. The contact portion 52 is provided with a first surface 502. In this way, when the moving contact 3 drives the first arc contact 4 to rotate, the first arc contact 4 and the second arc contact 5 can make contact and conduct electricity before the moving contact 3 contacts the grounding contact 2.
[0045] The other end of the contact portion 52 can be arranged to extend upward toward the grounding contact 2, and the opening 501 formed by the two first surfaces 502 is arranged upward.
[0046] The first connecting portions 51 of the two second arc contacts 5 are respectively arranged on opposite sides of the grounding contact 2 and extend upward toward the grounding contact 2 to form an opening 501 facing upward. When the moving contact 3 rotates downward, it can extend into one side of the grounding contact 2 through the opening 501.
[0047] Specifically, two first connecting portions 51 are respectively disposed on both sides of the second connecting portion 21 of the grounding contact 2. The end of the first connecting portion 51 away from the second connecting portion 21 is spaced apart from the contact head 22 to form a closing space 201. The first arc contact 4 can extend into the closing space 201 after passing through the opening 501 to contact the grounding contact 2.
[0048] As shown in Figure 6, the extension direction of the first connecting part 51 can be consistent with the extension direction of the contact head 22. One end of the first connecting part 51 is connected to the second connecting part 21. The closing space 201 formed between the end of the first connecting part 51 away from the second connecting part 21 and the contact head 22 provides sufficient space for the first arc contact 4 and the moving contact 3 to contact the grounding contact 2.
[0049] As shown in Figure 4, the contact portion 52 is formed by bending a metal part to create a first surface 502 with an arc shape. The manufacturing process of the contact portion 52 is relatively simple and the cost is low. In this scheme, the contact portion 52, formed by bending a metal part, achieves contact with the first arc contact 4 to form an arc current conduction, enabling the moving contact 3 and the grounding contact 2 to achieve a stable and reliable grounding and closing process, which has the advantage of simple structure.
[0050] As shown in Figure 4, the contact portion 52 has a first end 521 and a second end 522 connected along the height direction. The first end 521 is located above the second end 522, and the second end 522 is connected to the first connecting portion 51. Specifically, the first end 521 is positioned above the second end 522. That is, when the moving contact 3 rotates in the direction of grounding and closing, the moving contact 3 and the first arc contact 4 first pass through the opening 501 formed by the first end 521, and then through the opening 501 formed by the second end 522.
[0051] In the direction from top to bottom, the distance between the first ends 521 of the two contact portions 52 decreases, so that the opening 501 formed between the first ends 521 gradually narrows, and the distance between the second ends 522 of the two contact portions 52 increases, so that the opening 501 formed between the second ends 522 gradually expands.
[0052] In this way, as the moving contact 3 rotates towards the grounding and closing direction, the size of the opening 501 gradually narrows and then gradually widens. Combined with the movement of the first arc contact 4 and the second arc contact 5, it can be seen that the initial narrowing of the opening 501 ensures stable and reliable contact and conductivity between the first and second arc contacts 4 and 5 as they pass through the narrowing opening 501. Simultaneously, it guides the first arc contact 4 to accurately enter the position of the grounding contact 2. Then, the gradual widening of the opening 501 helps reduce the friction between the first and second arc contacts 4 and 5. Gradually, the first and second arc contacts 4 and 5 can switch to a non-connected state. As the moving contact 3 continues to rotate downwards, it can stably and reliably contact the grounding contact 2, thus completing the closing process.
[0053] The second mounting bracket 14 is installed on the cabinet 1 of the switchgear. The second mounting bracket 14 is spaced out on one side of the first mounting bracket 13.
[0054] As shown in Figures 5 and 7, the moving contact 3 comprises multiple moving contacts 3, each mounted on the second fixed base 14, and each moving contact 3 is rotatable relative to the second fixed base 14. When the moving contact 3 rotates toward the side where the grounding contact 2 is located to achieve electrical connection with the grounding contact 2, the grounding switch is in the grounding closed position. When the moving contact 3 rotates away from the side where the grounding contact 2 is located to disconnect from the grounding contact 2, the grounding switch is in the non-connected state.
[0055] The moving contact 3 is made of a current-resistant metal material. This ensures that when the moving contact 3 comes into contact with the grounding contact 2, the conductive circuit maintains good continuity.
[0056] As shown in Figures 3 and 4, the moving contact 3 includes a middle part 31 and a front end 32 and a rear end 33 located at both ends of the middle part 31. The rear end 33 is rotatably mounted on the second fixed base 14, the middle part 31 is used for transmission connection with the operating mechanism 11, and the front end 32 can rotate around the rear end 33 under the drive of the operating mechanism 11.
[0057] Specifically, three movable contacts 3 are arranged at intervals on the second fixed base 14. The middle part 31 of the movable contact 3 is driven to rotate at both ends by a transmission connection with the operating mechanism 11. The rear end 33 of the movable contact 3 is fixed and rotatably connected to the second fixed base 14, while the front end 32 of the movable contact 3 is free and rotates around the rotational connection point between the movable contact 3 and the second fixed base 14.
[0058] As shown in Figures 2 and 5, the downward rotation of the front end 32 of the moving contact 3 can drive the first arc contact 4 to rotate to one side of the first fixed base 13, and extend into the shielding space 602 through the opening 601 of the grounding shield 6. During this process, the moving contact 3 and the first arc contact 4 can extend into the side where the grounding contact 2 is located through the opening 501. When approaching the grounding contact 2, the first arc contact 4 and the second arc contact 5 first make contact and conduct electricity, so as to guide the electric arc formed between the moving contact 3 and the grounding contact 2, and ground it through the grounding copper busbar 12. This allows the grounding contact 2 and the moving contact 3 to be protected from electric arc burn-out at the moment of closing. Moreover, the grounding contact 2 and the moving contact 3 only need to carry a long-term stable current conduction process, which effectively extends the service life of the grounding contact 2 and the moving contact 3 and improves the reliability of the grounding and closing of the entire switch cabinet.
[0059] As shown in Figure 3, the first arc contact 4 is connected to the moving contact 3. There may be two first arc contacts 4. The two first arc contacts 4 are respectively disposed on the moving contact 3, and are located on opposite sides of the moving contact 3, so that when the moving contact 3 rotates, it drives the first arc contacts 4 to move.
[0060] Furthermore, each moving contact 3 has a moving contact 3 on its opposite sides.
[0061] Specifically, as shown in Figures 2 and 3, the front end 32 of the moving contact 3 is provided with a first arc contact 4. A first arc contact 4 is correspondingly provided on each of the two sides of the moving contact 3. When the first arc contact 4 rotates with the moving contact 3 to the position of the second arc contact 5, the two second arc contacts 5 are respectively located outside the two first arc contacts 4, and the second arc contact 5 on the corresponding side contacts the first arc contact 4 to conduct electricity.
[0062] The first arc contact 4 is made of an arc-resistant metal material. This material ensures that when the first arc contact 4 contacts the second arc contact 5, it can reliably carry current, reducing melting, ablation, or other forms of damage caused by the arc. Furthermore, the first arc contact 4 also acts as a metal shield, uniformly distributing the electric field at the front end 32 of the moving contact 3.
[0063] Specifically, when the moving contact 3 rotates in the direction of grounding and closing, each of the first arc contacts 4 has a first arc contact 4 on its opposite sides, so that the moving contact 3 is always located within the space enclosed by the first arc contacts 4, thereby playing a role in creating a uniform electric field on the front end 32 of the moving contact 3.
[0064] As shown in Figure 6, the first arc contact 4 has a second surface 401 on the side opposite to the moving contact 3. The second surface 401 is an arc surface. When the moving contact 3 rotates in the direction of grounding and closing, the second surface 401 of the first arc contact 4 can slide along the first surface 502 on the corresponding side.
[0065] Thus, the second surface 401 formed on the outer side of the first arc contact 4 is an arc surface. When the first arc contact 4 rotates with the moving contact 3 towards the grounding closing direction, the second surface 401 of the first arc contact 4 can slide along the first surface 502 of the second arc contact 5. On the one hand, this reduces the frictional force generated between the moving arc contact and the second arc contact 5, reducing wear caused by excessive friction at the beginning of contact. The lower frictional force makes the first arc contact 4 move more smoothly, less prone to jamming or poor contact. At the same time, it reduces surface damage to the second arc contact 5 and the first arc contact 4, thereby improving the reliability of the grounding switch and extending its service life.
[0066] On the other hand, by setting the second surface 401 as an arc surface, the risk of the first arc contact 4 easily accumulating and forming a high-intensity electric field region due to the presence of sharp edges or right-angle areas can be reduced, thereby achieving the purpose of a uniform electric field.
[0067] As shown in Figure 6, the first arc contact 4 can be designed as a hemispherical shape.
[0068] As shown in Figure 2, the grounding switch also includes a grounding shield 6. The grounding shield 6 is mounted on the first fixed base 13. The grounding shield 6 has multiple openings 601, with openings 501 located within the openings 601, through which each grounding contact 2 and the second arc contact 5 are exposed. When the moving contact 3 rotates in the direction of grounding and closing, the moving contact 3 can drive the first arc contact 4 to extend sequentially through the openings 601 and 501 into the grounding shield 6.
[0069] The grounding shield 6 can be configured as a single, integral metal component.
[0070] Furthermore, as shown in Figures 2 and 9, the grounding shield 6 can be an arched plate formed by bending a metal part. The arched plate and the first fixed base 13 enclose a shielding space 602, and each grounding contact 2 and the second arc contact 5 are distributed at intervals within the shielding space 602.
[0071] By uniformly encasing the three-phase grounding contacts 2 in a single metal piece, the electric field distribution of the grounding contacts 2 can be made more even, reducing the risk of excessively strong local electric fields. Furthermore, the metal material of the grounding shield 6 provides excellent electromagnetic shielding for the grounding contacts 2. Since the first connecting part 51 and the contact head 22 are spaced apart to form a closing space 201 located within the grounding shield 6, the grounding closing process of the moving contact 3 and the grounding contact 2 occurs within the grounding shield 6. The grounding shield 6 reduces the risk of electric field diffusion during the electrical connection between the moving contact 3 and the grounding contact 2, which is beneficial for maintaining the electrical stability of the grounding switch during the grounding closing process.
[0072] In some specific embodiments, the grounding shield 6 can be made of one piece of sheet metal.
[0073] As shown in Figures 2 and 9, the grounding switch also includes a reinforcing plate 7. The reinforcing plate 7 is vertically disposed on both sides of the second connecting portion 21 of the grounding quick-connect switch, and the first connecting portion 51 of the second arc contact 5 is sandwiched between the reinforcing plate 7 and the grounding switch. Multiple reinforcing plates 7 can be used, and a reinforcing plate 7 can be provided on the outer side of the first connecting portion 51 of each second arc contact 5, thereby clamping the first connecting portion 51 of each second arc contact 5 onto one side of the second connecting portion 21, improving the connection strength between the second arc contact 5 and the grounding contact 2.
[0074] As shown in Figure 2, the grounding switch also includes a first connector 81. The first connector 81 fixes one end of the reinforcing plate 7, one end of the first connecting part 51, and the second connecting part 21 together.
[0075] Specifically, the first connector 81 can be a screw, bolt, or similar structure. Correspondingly, one end of the reinforcing plate 7, one end of the first connecting part 51, and the second connecting part 21 are provided with connecting holes. The first connector 81 can be inserted into the connecting holes to fix one end of the reinforcing plate 7, one end of the first connecting part 51, and the second connecting part 21 together.
[0076] As shown in Figure 9, the grounding switch also includes a second connector 82, which fixes the other end of the reinforcing plate 7 and the other end of the first connector 51.
[0077] Specifically, the second connector 82 can be a screw, bolt, or similar structure. Correspondingly, the other end of the reinforcing plate 7 and the other end of the first connecting part 51 are provided with connecting holes. The first connector 81 can be inserted into the connecting holes to fix the other end of the reinforcing plate 7 and the other end of the first connecting part 51 together.
[0078] In this way, a stable connection can be made between the second arc contact 5 and the grounding contact 2. Since the moving contact 3 and the grounding contact 2 need to withstand corresponding mechanical forces and electric field forces during the grounding closing and opening operations, the installation of the reinforcing plate 7, the first connecting piece 81 and the second connecting piece 82 can make the opening and closing process of the grounding switch more stable and reliable.
[0079] The second connector 82 may include at least two, and the second connector 82 are connected at intervals.
[0080] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solutions and inventive concepts of this disclosure, and all such changes or substitutions should fall within the protection scope of this disclosure.
Claims
1. A switch cabinet, comprising: Cabinet; A grounding copper busbar is installed inside the cabinet and is used to connect to grounding equipment. A grounding contact is located inside the cabinet and is electrically connected to the grounding copper busbar. A movable contact is disposed inside the cabinet, and the movable contact can rotate relative to the cabinet. A first arc contact is connected to the moving contact so that when the moving contact rotates, the first arc contact can move with the moving contact. The second arc contact is electrically connected to the grounding copper busbar, and the second arc contact is located on one side of the grounding contact; When the moving contact rotates in the direction of grounding and closing, the moving contact can drive the first arc contact to rotate, so that the first arc contact and the second arc contact can conduct electricity before the grounding contact and the moving contact make contact.
2. The switchgear according to claim 1, wherein, Both the first arc contact and the second arc contact are made of arc-resistant metal material; Both the grounding contact and the moving contact are made of current-resistant metal materials.
3. The switchgear according to claim 1, wherein, The first arc contact includes two, and the two first arc contacts are respectively disposed on opposite sides of the moving contact; The second arc contact includes two, which are respectively disposed on opposite sides of the grounding contact. The two second arc contacts are spaced apart to form an opening, which allows the moving contact and the first arc contact to extend into the side where the grounding contact is located. When the moving contact rotates in the direction of grounding and closing, the moving contact drives the first arc contact to rotate through the opening. The second arc contact is located on the outside of the first arc contact, and the second arc contact can make contact with the first arc contact on the corresponding side to conduct electricity.
4. The switchgear according to claim 3, wherein, The inner side of the second arc contact has a first surface, which is an arc surface, and the first surfaces of the two second arc contacts are arranged at intervals to form the opening; When the moving contact rotates in the direction of grounding and closing, the first arc contact can slide along the first surface provided on the corresponding side.
5. The switchgear according to claim 4, wherein, The second arc contact includes a first connecting portion and a contact portion. The first connecting portions of the two second arc contacts are respectively fixedly connected to the lateral sides of the grounding contact. One end of the contact portion is connected to the first connecting portion, and the other end of the contact portion extends toward the movement trajectory of the second arc contact. The contact portion is provided with the first surface.
6. The switchgear according to claim 5, wherein, The contact portion is formed by bending a metal part to create the first surface, which is an arc shape.
7. The switchgear according to claim 5, wherein, The contact portion has a first end and a second end connected along the height direction, the first end being located above the second end, and the second end being connected to the first connecting portion; In the top-to-bottom direction, the distance between the first ends of the two contact portions decreases, so that the opening formed between the first ends gradually narrows, and the distance between the second ends of the two contact portions increases, so that the opening formed between the second ends gradually widens.
8. The switchgear according to claim 5, wherein, The grounding contact includes a second connecting part and a contact head, the second connecting part being connected to the grounding copper busbar, and the contact head being vertically disposed on the second connecting part; Two first connecting portions are disposed on both sides of the second connecting portion laterally. The end of the first connecting portion away from the second connecting portion is spaced apart from the contact head to form a closing space. The closing space is connected to the opening so that when the moving contact rotates in the direction of grounding and closing, the moving contact can drive the first arc contact to pass through the opening and extend into the closing space.
9. The switchgear according to claim 8, wherein, It also includes a reinforcing plate, which is vertically disposed on both sides of the second connecting part in the lateral direction, and the first connecting part is sandwiched between the reinforcing plate and the grounding switch.
10. The switchgear according to claim 9, wherein, Also includes: A first connector, which fixes one end of the reinforcing plate, one end of the first connecting part, and the second connecting part together. The second connector securely connects the other end of the reinforcing plate to the other end of the first connector.
11. The switchgear according to claim 3, wherein, It also includes a first fixing base, which is disposed inside the cabinet; the grounding contact includes a plurality of grounding contacts, which correspond to a phase of the power supply network, and the plurality of grounding contacts are all disposed on the first fixing base, and the second arc contact is respectively disposed on both sides of each grounding contact to form a plurality of openings; It also includes a grounding shield, which is set on the first fixed base. The grounding shield has multiple openings, and the openings are located inside the openings. Each grounding contact and the second arc contact are exposed from the corresponding openings, so that when the moving contact rotates in the direction of grounding and closing, the moving contact can drive the first arc contact to extend into the grounding shield in sequence through the openings and the openings.
12. The switchgear according to claim 11, wherein, The grounding shield is an arched plate formed by bending a metal part. The arched plate and the first fixed base enclose a shielding space, and the grounding contacts and the second arc contacts are distributed at intervals within the shielding space.
13. The switchgear according to claim 4, wherein, The first arc contact has a second surface on the side opposite to the moving contact. The second surface is an arc surface. When the moving contact rotates in the direction of grounding and closing, the moving contact can drive the second surface to slide along the first surface on the corresponding side.
14. The switchgear according to claim 13, wherein, The cabinet is equipped with an operating mechanism. The moving contact includes a middle part and a front end and a rear end located at both ends of the middle part. The rear end is rotatably mounted on the cabinet. The middle part is connected to the operating mechanism. The front end can rotate around the rear end under the drive of the operating mechanism. The front end is provided with the first arc contact, which is disposed on opposite sides of the front end.