Static change-over switch

Abstract

The utility model belongs to the field of static change-over switches, and provides a static change-over switch, which comprises a machine body provided with an external power supply connecting end, a load connecting end and a standby power supply connecting end, and the standby power supply connecting end is electrically connected with the load connecting end; and the mainboard and relay integration is arranged in the machine body and is electrically connected with the mainboard, the external power supply connecting end, the load connecting end and the standby power supply connecting end. Compared with the prior art, the static change-over switch has the advantages that the relay is integrally arranged in the machine body and matched with the main board, the relay is adopted as a turn-off element of the static change-over switch, the turn-off time can be shortened to about 10ms, the defect that a thyristor does not conform to safety regulations is overcome, and the defects that a contactor is low in turn-off speed and high in cost are overcome. According to the technical scheme, the static change-over switch is economical and low in manufacturing cost, the stability and reliability of the whole system are guaranteed, and rapid switching of the static change-over switch between the grid-connected mode and the off-grid mode can be achieved.

Description

Technical Field

[0001] This utility model belongs to the field of static transfer switches, and specifically relates to a static transfer switch. Background Technology

[0002] Static transfer switches (STS) are used for quick switching between grid and energy storage or off-grid systems. For example, when switching between grid-connected and off-grid modes, STS can ensure a seamless transition and prevent power outages. In grid-connected mode, the static transfer switch connects to both the grid and the energy storage converter connected to the battery. At this time, the grid supplies power to the load and charges the battery. When the grid becomes unstable, the static transfer switch will quickly disconnect from the grid and switch the battery to supply power to the load.

[0003] Existing static transfer switches are beginning to use thyristors or automatic contactors (ATS) as the core components of the switching circuit. While thyristor-based static transfer switches offer fast turn-off speeds (5-10ms), thyristors are prone to overheating during operation and lack physical isolation, failing to meet safety regulations. Contactor-based static transfer switches, while providing physical isolation and meeting safety regulations, have slower turn-off speeds (around 20ms), making them unsuitable for the market demand for fast turn-off. Furthermore, these static transfer switches are complex, bulky, and costly. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is to propose a new type of static transfer switch that both complies with safety regulations and has a fast shutdown capability.

[0005] The technical solution adopted by this utility model to solve its technical problem is to propose a static transfer switch, including: a body, which is equipped with an external power connection terminal, a load connection terminal and a backup power connection terminal, wherein the backup power connection terminal is electrically connected to the load connection terminal.

[0006] The motherboard is located inside the chassis.

[0007] An integrated relay is disposed within the housing and electrically connected to the motherboard, external power supply connection terminal, load connection terminal, and backup power supply connection terminal. The integrated relay is used to open or close the electrical connection between the external power supply connection terminal and the load connection terminal.

[0008] In the aforementioned static transfer switch, a static transfer switch connection port is provided on one side of the body. The static transfer switch connection port is used to electrically connect another static transfer switch. The static transfer switch connection port is electrically connected to the relay. The relay is also used to turn on or off the electrical connection between the static transfer switch connection port and the load connection terminal.

[0009] In the aforementioned static transfer switch, the static transfer switch connection port, the external power supply connection port, the backup power supply connection port, and the load connection port all have four connection points: R, S, T, and N. R, S, and T represent different phase lines of the three-phase electricity, and N represents the neutral line.

[0010] The relay integration includes several relay connection modules, which are used to connect or disconnect the same connection point between the external power supply connection terminal and / or the static changeover switch connection port and the load connection terminal.

[0011] In the aforementioned static transfer switch, the external power supply connection terminal includes a power grid connection terminal and / or a motor connection terminal, wherein the power grid connection terminal and / or the motor connection terminal are arranged in parallel with the load connection terminal;

[0012] The backup power supply connection terminal is an energy storage converter connection terminal, which is located below the external power supply connection terminal or the load connection terminal.

[0013] In the aforementioned static transfer switch, the external power supply connection terminal includes a power grid connection terminal and a motor connection terminal;

[0014] The relay integration includes a first relay board, a second relay board, a third relay board, and a fourth relay board; the first relay board, the second relay board, the third relay board, and the fourth relay board are arranged from top to bottom within the body of the machine.

[0015] The first relay board is electrically connected to the R connection point and S connection point of the power grid connection terminal, the load connection terminal, and the motor connection terminal, respectively; the first relay board has four relay connection modules, which are used for the electrical connection between the load connection terminal and the power grid connection terminal and between the load connection terminal and the motor connection terminal, respectively.

[0016] The second relay board is electrically connected to the T-connection point and N-connection point of the power grid connection terminal, the load connection terminal, and the motor connection terminal, respectively; the second relay board has four relay connection modules, which are used for the electrical connection between the load connection terminal and the power grid connection terminal and between the load connection terminal and the motor connection terminal, respectively.

[0017] The third relay board has two relay connection modules, which are respectively used for the electrical connection between the load connection terminal and the S connection point and N connection point of the static changeover switch connection terminal;

[0018] The fourth relay board has two relay connection modules, which are used for electrical connection between the load connection terminal and the R connection point and T connection point of the static transfer switch connection terminal, respectively.

[0019] In the aforementioned static changeover switch, four fans are provided below both the first relay board and the second relay board, and the positions of the four fans correspond one-to-one with the positions of the four relay connection modules provided on each relay board.

[0020] A fan bracket is disposed between the second relay plate and the third relay plate. The fan bracket has two fans, and the positions of the two fans correspond one-to-one with the positions of the two relay connection modules on the third relay plate.

[0021] Two fans are located below the third relay board, and the positions of the two fans correspond one-to-one with the positions of the two relay connection modules on the fourth relay board.

[0022] In the aforementioned static transfer switch, each relay connection module includes at least two relays connected in parallel, and each relay connection module is electrically connected to a current sensor.

[0023] In the aforementioned static transfer switch, the different connection points of the external power supply connection terminal and the backup power supply connection terminal are respectively electrically connected to the relay via conductive plates.

[0024] In the aforementioned static transfer switch, the backup power connection terminal includes at least two energy storage converter connection ports, and all of the energy storage converter connection ports are arranged below the load connection terminal.

[0025] In the aforementioned static transfer switch, the power grid connection terminal, motor connection terminal, and load connection terminal are arranged in a stepped manner.

[0026] The distance between the port position of the load connection terminal and the body is greater than the distance between the port position of the power grid connection terminal or the motor connection terminal and the body.

[0027] A contactor is provided between the energy storage converter connection terminal and the load connection terminal;

[0028] An AC terminal block is provided on one side of the machine body. The AC terminal block is used to connect to the power grid or to the AC side of the motor to power the static transfer switch and the energy storage converter.

[0029] The device is also equipped with a WiFi data acquisition stick, which is electrically connected to the motherboard.

[0030] A network port electrically connected to the motherboard is provided on one side of the machine body;

[0031] The static changeover switch also has an external bracket for a receiving cavity. The body is placed inside the receiving cavity, and a first support foot and a second support foot are respectively provided at the diagonal corners of the top and bottom walls of the external bracket. A slot is opened in the second support foot, and two adjacent external brackets can be stacked by inserting the first support foot into the slot.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) This utility model discloses a static transfer switch by integrating a relay into the body and cooperating with the main board. Using the relay as the switching element, the switching time can be reduced to approximately 10ms. This overcomes the shortcomings of thyristors (which do not meet safety regulations) and the drawbacks of contactors (slow switching speed and high cost). The static transfer switch described in this technical solution is economical in manufacturing cost, ensures the stability and reliability of the overall system, and enables rapid switching between on-grid and off-grid modes.

[0034] (2) Based on the distribution characteristics of each phase connection point, the relay integration is divided into multiple relay boards, each corresponding to a different combination of connection points for centralized control. This hierarchical and zoned control strategy not only simplifies the complexity of the circuit system but also improves the response speed and control accuracy of the relay action. At the same time, it facilitates rapid location and replacement in case of faults, greatly improving the maintainability and operating efficiency of the system.

[0035] (3) By configuring fans corresponding to the number of relay modules and setting up fan brackets for airflow guidance, the heat dissipation efficiency is effectively improved, which helps to reduce the temperature rise caused by the relay working for a long time, extend the service life of the equipment, and ensure the stable operation of the equipment in a high-temperature environment, thereby improving the safety and reliability of the overall system.

[0036] (4) Since the wires used for high current are relatively thick, this solution effectively prevents the current between different phases from interfering with each other by using a stepped design; at the same time, the design of the load end protruding relative to the grid end and the motor end further avoids interference from the grid end or the motor grid wires.

[0037] (5) The external bracket, through the insertion design of the first support foot and the slot, helps to stack different STS devices. The overall structure is simple, the operation is convenient and quick, and the stability is guaranteed. Attached Figure Description

[0038] Figure 1 This is a perspective view of this application;

[0039] Figure 2 This is a schematic diagram of the installation structure of the load connection terminal, power grid connection terminal, and motor connection terminal on the machine body;

[0040] Figure 3 yes Figure 2 The left view;

[0041] Figure 4 This is a schematic diagram of the AC terminal block installation structure on the machine body;

[0042] Figure 5 This is a schematic diagram of the installation structure between the motherboard and various relay boards inside the machine.

[0043] Figure 6 This is a schematic diagram of the mounting structure between the fan and the first relay board and the second relay board, respectively.

[0044] Figure 7 This is a schematic diagram of the mounting structure of the conductive plate and the current sensor on the first relay plate;

[0045] Figure 8 This is a schematic diagram of the mounting structure of the current sensor and relay connection module on the second relay board;

[0046] Figure 9 This is a schematic diagram of the installation structure between the relay connection module, the conductive plate, the fan, and the first relay board.

[0047] Figure 10 This is a schematic diagram of the parallel connection scheme of the static transfer switch connection ports.

[0048] In the diagram, 1 is the machine body; 10 is the external power supply connection terminal; 100 is the power grid connection terminal; 101 is the motor connection terminal; 11 is the load connection terminal; 12 is the backup power supply connection terminal; 13 is the static transfer switch connection port; 14 is the contactor; 15 is the AC terminal block; and 16 is the network port.

[0049] 2. Motherboard;

[0050] 3. Relay integration; 30. Relay connection module; 300. Relay; 31. First relay board; 32. Second relay board; 33. Third relay board; 34. Fourth relay board; 35. Fan; 36. Fan bracket; 37. Current sensor;

[0051] 4. Conductive plate;

[0052] 5. External bracket; 50. Receiving cavity; 51. First support leg; 52. Second support leg; 520. Groove; 53. Anti-detachment plate. Detailed Implementation

[0053] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0054] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0055] Example 1:

[0056] like Figures 1 to 10 As shown, this utility model discloses a static changeover switch, comprising: a body 1, equipped with an external power supply connection terminal 10, a load connection terminal 11, and a backup power supply connection terminal 12, wherein the backup power supply connection terminal 12 is electrically connected to the load connection terminal 11; a main board 2, disposed within the body 1; and a relay integration 3, disposed within the body 1 and electrically connected to the main board 2, the external power supply connection terminal 10, the load connection terminal 11, and the backup power supply connection terminal 12, wherein the relay integration 3 is used to open or close the electrical connection between the external power supply connection terminal 10 and the load connection terminal 11.

[0057] Specifically, such as Figures 1 to 10 As shown, it should be noted that in this embodiment, the backup power connection terminal 12 is directly electrically connected to the load connection terminal 11. Preferably, a contactor can be added between the backup power connection terminal 12 and the load connection terminal 11 to improve overall safety. In grid-connected mode, the energy storage converter and the grid can supply power to the load together through a static transfer switch (STS, hereinafter referred to as STS in the description), or the grid can supply power to the load and charge the battery connected to the energy storage converter through the STS. When the external power supply is unstable, experiences a power outage, or experiences frequency deviation, the STS quickly disconnects the grid connection, and the energy storage converter switches to discharge mode. At this time, the load is powered by the battery connected to the energy storage converter. When the external power supply is detected to have stabilized, the corresponding relay 300 in the main board 2 control relay integration 3, which is used to open or close the connection between the load and the external power supply, closes, making the external power connection terminal 10 and the load connection terminal 11 conductive. At this time, the external power supply can charge the backup power supply, the load is directly powered by the external main power supply, and the equipment operates stably. This technical solution uses relays to switch between different power sources, providing physical isolation in case of external power failure, and switching to backup power in about 10ms, thus ensuring the reliability and safety of the power system.

[0058] A static changeover switch connection port 13 is provided on one side of the body 1. The static changeover switch connection port 13 is used to electrically connect another static changeover switch described in this technical solution. The static changeover switch connection port 13 is electrically connected to the relay integration 3. The relay integration 3 is also used to turn on or off the electrical connection between the static changeover switch connection port 13 and the load connection terminal 11.

[0059] Furthermore, such as Figures 2 to 10 As shown, this embodiment can also introduce a scheme where multiple static transfer switches are connected in parallel. That is, when multiple important loads require unified power supply management, or when a redundant power supply system needs to be built, multiple static transfer switches can be electrically connected to each other through their static transfer switch connection ports 13. For example, two static transfer switches, A and B, can be connected in parallel, each with a backup power supply. In off-grid mode, if the backup power supply of static transfer switch A is exhausted, static transfer switch A can draw on the backup power supply of static transfer switch B to power the load of static transfer switch A. Alternatively, multiple static transfer switches can power a single load. If one static transfer switch has a power of 500KW, two connected in parallel can achieve a total power of 1000KW, and so on, meeting the power requirements of different loads and easily achieving power expansion. The static transfer switch combination described in this technical solution is flexible and highly applicable.

[0060] The static transfer switch connection port 13, external power supply connection port 10, backup power supply connection port 12, and load connection port 11 all have four connection points: R, S, T, and N (RSTNZ). Figure 2 (Distributed sequentially from top to bottom); R, S, and T represent different phase lines of the three-phase electricity, and N represents the neutral line; the relay integration 3 includes several relay connection modules 30, which are used to connect or disconnect the same connection point between the external power supply connection terminal 10 and / or the static transfer switch connection port 13 and the load connection terminal 11. Therefore, if the external power supply connection terminal 10 only has a power grid connection terminal 100, the number of relay connection modules 30 is 4 (that is, representing the R\S\T\N connection between the load and the power grid respectively). If the external power supply connection terminal 10 includes a power grid connection terminal 100 and a motor connection terminal 101, the number of relay connection modules 30 is 8 (that is, representing the R\S\T\N connection between the load and the power grid, and the R\S\T\N connection between the load and the motor respectively).

[0061] Furthermore, such as Figure 2As shown, in this embodiment, R, S, and T are three live wires with a voltage difference of 120° between them, and N is the neutral wire. In this technical solution, the external power connection terminal 10 includes a grid connection terminal 100 and / or a motor connection terminal 101, which are arranged in parallel with the load connection terminal 11; the backup power connection terminal 12 is an energy storage converter connection terminal, which is located below the external power connection terminal 10 or the load connection terminal 11.

[0062] This embodiment uses a static transfer switch with a relay as the switching element, which is applicable to scenarios where only the grid and energy storage converter need to work together in grid-connected mode, and also applicable to scenarios where only the motor and energy storage converter need to work together in off-grid mode. Preferably, the static transfer switch in this embodiment has a grid connection terminal 100, a motor connection terminal 101, and an energy storage converter connection terminal.

[0063] The power grid connection terminal 100 and / or the motor connection terminal 101 are arranged side-by-side with the load connection terminal 11 on the body 1 for easy wiring and maintenance; Figure 2 and Figure 3 As shown, the load connection terminal 11, the power grid connection terminal 100, and the motor connection terminal 101 are all arranged in a stepped shape. Since the wires used for high current are relatively thick, this stepped design can effectively prevent wire harness interference between different phases (i.e., RSTN).

[0064] like Figure 3 As shown, the distance between the port position of the load connection terminal 11 and the body 1 is greater than the distance between the port position of the power grid connection terminal 100 or the motor connection terminal 101 and the body 1. In other words, the load connection terminal 11 is relatively more prominent than its left and right ends (i.e., the power grid connection terminal 100 and the motor connection terminal 101), mainly to prevent interference from the wire harnesses at the left and right ends.

[0065] The relay integration 3 includes a first relay board 31, a second relay board 32, a third relay board 33, and a fourth relay board 34; the first relay board 31, the second relay board 32, the third relay board 33, and the fourth relay board 34 are arranged from top to bottom within the body 1.

[0066] The first relay board 300 is electrically connected to the R connection point and S connection point of the power grid connection terminal 100, the load connection terminal 11, and the motor connection terminal 101, respectively. The first relay board 31 has four relay connection modules 30, which are used for the electrical connection between the load connection terminal 11 and the power grid connection terminal 100 and between the load connection terminal 11 and the motor connection terminal 101 (i.e., the R connection point of the load connection terminal is connected to the R connection point of the power grid connection terminal, the S connection point of the load connection terminal is connected to the S connection point of the power grid connection terminal, the R connection point of the load connection terminal is connected to the R connection point of the motor connection terminal, and the S connection point of the load connection terminal is connected to the S connection point of the motor connection terminal).

[0067] The second relay board 32 is electrically connected to the T-connection point and N-connection point of the power grid connection terminal 100, the load connection terminal 11, and the motor connection terminal 101, respectively. The second relay board 32 has four relay connection modules 30, which are used for the electrical connection between the load connection terminal 11 and the power grid connection terminal 100 and between the load connection terminal 11 and the motor connection terminal 101 (i.e., the T-connection point of the load connection terminal is connected to the T-connection point of the power grid connection terminal, the N-connection point of the load connection terminal is connected to the N-connection point of the power grid connection terminal, the T-connection point of the load connection terminal is connected to the T-connection point of the motor connection terminal, and the N-connection point of the load connection terminal is connected to the N-connection point of the motor connection terminal).

[0068] The third relay board 33 has two relay connection modules 30, which are used for electrical connection between the load connection terminal 11 and the S connection point and N connection point of the static transfer switch connection terminal, respectively. (That is, the S connection point of the load connection terminal is connected to the S connection point of the static transfer switch connection terminal, and the N connection point of the load connection terminal is connected to the N connection point of the static transfer switch connection terminal).

[0069] The fourth relay board 34 has two relay connection modules 30, which are used for electrical connection between the load connection terminal 11 and the R connection point and T connection point of the static transfer switch connection terminal (i.e., the R connection point of the load connection terminal and the R connection point of the static transfer switch connection terminal, and the T connection point of the load connection terminal and the T connection point of the static transfer switch connection terminal).

[0070] like Figure 3 and Figure 4 As shown, based on the distribution characteristics of each phase connection point, the relay integrated 3 is divided into multiple relay 300 boards, each corresponding to a different combination of connection points for centralized control. This hierarchical and zoned control strategy not only simplifies the complexity of the circuit system but also improves the response speed and control accuracy of the relay 300. Furthermore, it facilitates rapid fault location and replacement, greatly enhancing the maintainability and operational efficiency of the system.

[0071] Four fans 35 are provided below the first relay plate 31 and the second relay plate 32, and the positions of the four fans 35 correspond one-to-one with the positions of the four relay connection modules 30 provided on each relay plate 300; a fan bracket 36 is provided between the second relay plate 32 and the third relay plate 33, and the fan bracket 36 has two fans 35, and the positions of the two fans 35 correspond one-to-one with the positions of the two relay connection modules 30 on the third relay plate 33; two fans 35 are provided below the third relay plate 33, and the positions of the two fans 35 correspond one-to-one with the positions of the two relay connection modules 30 on the fourth relay plate 34.

[0072] More preferably, such as Figure 4 As shown, when the static transfer switch frequently performs switching operations (such as during power grid fluctuations), and each relay performing the energizing action during operation, it will withstand a current of up to 270A, generating significant heat from the relays and their respective relay boards. In this situation, by uniformly accelerating the relevant fans 35, the overall airflow efficiency can be effectively improved, preventing localized overheating that could lead to performance degradation or shortened lifespan of the relays 300. Furthermore, by configuring fans 35 corresponding to the number of relay 300 modules below the key relay 300 boards and using fan brackets 36 for airflow guidance, heat dissipation efficiency is effectively improved. This excellent heat dissipation design helps reduce the temperature rise generated by the relays 300 during prolonged operation, extending the equipment's lifespan and ensuring stable operation in high-temperature environments, thereby enhancing the overall system's safety and reliability.

[0073] More preferably, such as Figure 4 As shown, each relay connection module 30 in this embodiment comprises at least two parallel relays 300, and each relay can withstand a maximum current of 270A. Thus, when the same phase point is connected, the instantaneous current flowing through it can reach up to 1350A. The static transfer switch of this embodiment can be used for high-power loads in industrial and commercial applications, and is suitable for a variety of loads.

[0074] Meanwhile, each relay connection module 30 is equipped with a current sensor, which can monitor the current status in real time, realize intelligent management, facilitate remote monitoring and early warning, and improve the intelligence level and operation and maintenance efficiency of the system.

[0075] More preferably, such as Figures 4 to 9 As shown, in this embodiment, the different connection points of the external power supply connection terminal 10 and the backup power supply connection terminal 12 are connected to the relay integration 3 through the conductive plate 4. This conductive plate 4 connection method has the advantages of low contact resistance, strong current carrying capacity and good thermal stability, which greatly improves the reliability and safety of electrical connection and reduces the risk of overheating caused by poor contact. It is especially suitable for high power and high current application scenarios.

[0076] More preferably, such as Figure 2 As shown, the backup power supply connection terminal in this embodiment includes at least two energy storage converter connection ports, all of which are arranged below the load connection terminal. The multi-port design supports simultaneous access of multiple energy storage units, enhancing the system's energy storage capacity and load response capability. The rational layout makes connection convenient and the structure compact, improving the device's scalability and ease of operation and maintenance.

[0077] like Figure 2 and Figure 3 As shown, in this embodiment, a contactor 14 is configured between the energy storage converter connection terminal and the load connection terminal. The contactor 14 enhances the safety of the connection between the energy storage converter and the static transfer switch. It automatically trips in case of an abnormal current, ensuring the safety of the user and equipment. The backup power connection terminal includes five energy storage converter connection ports (…). Figure 2 The lowest end of the circuit has five sets of neutral (N) lines, and a corresponding number of R, S, and T three-phase connection points are also distributed between the N lines and the contactors. The five energy storage converter connection ports are arranged below the load connection terminals, meaning each contactor 14 connects to one energy storage converter (PCS). Each energy storage converter contains a battery pack, providing temporary power support during power switching to ensure uninterrupted power supply to the load. It should be noted that this embodiment can connect a minimum of one PCS and a maximum of five PCS. The number of PCS connected in parallel can be adjusted according to actual needs. The more PCS connected in parallel, the higher the power that the static transfer switch in this embodiment can provide to the load, up to the maximum power that the static transfer switch in this embodiment can provide. Users can configure the required number of PCS according to their actual usage. For customers, being able to purchase the required number of PCS based on their own needs helps to rationally utilize their budget. In conclusion, the static transfer switch in this embodiment has extremely high economic value. Furthermore, as... Figure 4 As shown, an AC terminal 15 is also provided on one side of the machine body. The AC terminal 15 is used to connect to the power grid or to the AC side of the motor to power the static transfer switch and energy storage converter. For example, if the power grid is under maintenance, when the static transfer switch and energy storage converter start up, the discharge of the energy storage converter may cause current to flow back to the power grid, posing a hazard to power grid maintenance personnel and violating safety regulations. Because the power grid is first connected to the AC terminal 15 to power the static transfer switch and energy storage converter, if the power grid is not under maintenance, the power supply is successful.

[0078] like Figure 3 As shown, by equipping the device with a WiFi data acquisition stick and leveraging WiFi networking capabilities, the STS can send real-time device operation data to the cloud monitoring platform and remotely receive commands, supporting more complex automation scenarios and greatly improving operational convenience and response speed.

[0079] The unit is equipped with 5 network ports 16, all of which are electrically connected to the motherboard 2 and can establish communication with the PCS via network cable, thereby strengthening the cooperation between the STS and the PCS and realizing the rapid switching between grid-connected and off-grid modes of the industrial and commercial energy storage solution composed of static transfer switch and energy storage converter.

[0080] Example 2:

[0081] This second embodiment is mainly to realize the placement and stacking of the static transfer switch (STS) in the first embodiment. Specifically, this second embodiment includes an external bracket 5 with a receiving cavity 50 for storing the static transfer switch. The top and bottom walls of the external bracket 5 are respectively provided with a first support foot 51 and a second support foot 52. The second support foot 52 has a slot 520. Two adjacent external brackets 5 can be stacked by movably inserting the first support foot 51 into the slot 520.

[0082] Specifically, such as Figure 1 As shown, the receiving cavity 50 in this embodiment not only accommodates the static transfer switch (STS), providing physical protection for the STS and facilitating maintenance and expansion, but also provides excellent guidance and limiting effects during STS placement, ensuring that the STS is accurately and securely fixed within the external bracket 5. Furthermore, when different STSs need to be stacked or arranged, the specific operating steps are as follows: correctly place the first STS into the external bracket 5; for the second STS, insert the first support foot 51 at the bottom into the slot 520 of the second support foot 52 at the top of the first bracket; repeat the above steps to continue stacking more STSs, forming a multi-layer structure; the connection between two adjacent STSs can be achieved through the wiring terminals described in the above embodiment, which will not be elaborated here. This structure not only increases the stability and reliability of the system but also avoids safety hazards caused by unstable stacked structures, improving the overall performance and efficiency of the structure.

[0083] Preferably, such as Figure 1 As shown, in this second embodiment, an anti-detachment plate 53 can also be connected to the external bracket 5. The anti-detachment plate 53 is located on one side of the receiving cavity 50, making the receiving cavity 50 a semi-sealed design. With the design of the anti-detachment plate 53, not only is the stability of the STS in the bracket increased, but the vibration resistance of the entire system is also improved. At the same time, it helps to make the installation of the STS simpler and faster, and avoids the STS from being misaligned in the receiving cavity 50, which would affect the stability and reliability of subsequent stacking and expansion.

[0084] It should be noted that in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0085] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0086] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A static changeover switch, characterized in that, include: The machine body is equipped with an external power supply connection terminal, a load connection terminal and a backup power supply connection terminal, wherein the backup power supply connection terminal is electrically connected to the load connection terminal. The motherboard is located inside the chassis. An integrated relay is disposed within the housing and electrically connected to the motherboard, external power supply connection terminal, load connection terminal, and backup power supply connection terminal. The integrated relay is used to open or close the electrical connection between the external power supply connection terminal and the load connection terminal.

2. A static changeover switch according to claim 1, characterized in that, A static changeover switch connection port is provided on one side of the machine body. The static changeover switch connection port is used to electrically connect another static changeover switch. The static changeover switch connection port is integrated with the relay and is also used to turn on or off the electrical connection between the static changeover switch connection port and the load connection terminal.

3. A static changeover switch according to claim 1 or 2, characterized in that, The static transfer switch connection port, the external power supply connection port, the backup power supply connection port, and the load connection port all have four connection points: R, S, T, and N. R, S, and T represent different phase lines of the three-phase electricity, and N represents the neutral line. The relay integration includes several relay connection modules, which are used to connect or disconnect the same connection point between the external power supply connection terminal and / or the static changeover switch connection port and the load connection terminal.

4. A static changeover switch according to claim 3, characterized in that, The external power supply connection terminal includes a power grid connection terminal and / or a motor connection terminal, and the power grid connection terminal and / or the motor connection terminal are arranged in parallel with the load connection terminal; The backup power supply connection terminal is an energy storage converter connection terminal, which is located below the external power supply connection terminal or the load connection terminal.

5. A static changeover switch according to claim 4, characterized in that, The external power supply connection terminal includes a power grid connection terminal and a motor connection terminal; The relay integration includes a first relay board, a second relay board, a third relay board, and a fourth relay board; the first relay board, the second relay board, the third relay board, and the fourth relay board are arranged from top to bottom within the body of the machine. The first relay board is electrically connected to the R connection point and S connection point of the power grid connection terminal, the load connection terminal, and the motor connection terminal, respectively; the first relay board has four relay connection modules, which are used for the electrical connection between the load connection terminal and the power grid connection terminal and between the load connection terminal and the motor connection terminal, respectively. The second relay board is electrically connected to the T-connection point and N-connection point of the power grid connection terminal, the load connection terminal, and the motor connection terminal, respectively; the second relay board has four relay connection modules, which are used for the electrical connection between the load connection terminal and the power grid connection terminal and between the load connection terminal and the motor connection terminal, respectively. The third relay board has two relay connection modules, which are respectively used for the electrical connection between the load connection terminal and the S connection point and N connection point of the static changeover switch connection terminal; The fourth relay board has two relay connection modules, which are used for electrical connection between the load connection terminal and the R connection point and T connection point of the static transfer switch connection terminal, respectively.

6. A static changeover switch according to claim 5, characterized in that, Four fans are provided below the first relay board and the second relay board, and the positions of the four fans correspond one-to-one with the positions of the four relay connection modules provided on each relay board. A fan bracket is disposed between the second relay plate and the third relay plate. The fan bracket has two fans, and the positions of the two fans correspond one-to-one with the positions of the two relay connection modules on the third relay plate. Two fans are located below the third relay board, and the positions of the two fans correspond one-to-one with the positions of the two relay connection modules on the fourth relay board.

7. A static changeover switch according to claim 5 or 6, characterized in that, Each of the relay connection modules includes at least two relays connected in parallel, and each of the relay connection modules is electrically connected to a current sensor.

8. A static changeover switch according to claim 3, characterized in that, The different connection points of the external power supply connection terminal and the backup power supply connection terminal are respectively electrically connected to the relay through a conductive plate.

9. A static changeover switch according to any one of claims 4-6, characterized in that, The backup power connection terminal includes at least two energy storage converter connection ports, and all of the energy storage converter connection ports are arranged below the load connection terminal.

10. A static changeover switch according to claim 4, characterized in that, The power grid connection terminal, motor connection terminal, and load connection terminal are arranged in a stepped manner. The distance between the port position of the load connection terminal and the body is greater than the distance between the port position of the power grid connection terminal or the motor connection terminal and the body. A contactor is provided between the energy storage converter connection terminal and the load connection terminal; An AC terminal is provided on one side of the machine body. The AC terminal is used to connect to the power grid or to the AC side of the motor to power the static transfer switch and the energy storage converter. The device is also equipped with a WiFi data acquisition stick, which is electrically connected to the motherboard. A network port electrically connected to the motherboard is provided on one side of the machine body; The static changeover switch also has an external bracket for a receiving cavity. The body is placed inside the receiving cavity, and a first support foot and a second support foot are respectively provided at the diagonal corners of the top and bottom walls of the external bracket. A slot is opened in the second support foot, and two adjacent external brackets can be stacked by inserting the first support foot into the slot.

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