Cabinet-separated outdoor solid-state transformer

Abstract

The utility model provides a sub-cabinet type outdoor solid-state transformer, which comprises a plurality of split cabinets connected in sequence, a plurality of secondary cables and copper bars are arranged between the split cabinets, a first waterproof structure is sleeved outside each secondary cable, and the first waterproof structure comprises a mounting sleeve, a cable sleeve and a waterproof component, the mounting sleeve is fixedly connected to the side wall of the split cabinet; the cable sleeve is arranged in the installation sleeves of the two connected split cabinets in a penetrating mode, and the waterproof assembly is fixedly connected between the installation sleeves and the cable sleeve. The split cabinet adopts a standardized interface design, and capacity expansion can be realized by increasing or decreasing the number of the cabinet bodies. The waterproof connection structure of the copper bars and the cables adopts prefabricated assemblies, only modular splicing needs to be completed during field installation, the construction efficiency is improved, and the waterproof connection structure is particularly suitable for power grid transformation scenes and outdoor scenes needing staged capacity expansion.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage switchgear technology, specifically a cabinet-type outdoor solid-state transformer. Background Technology

[0002] With the rapid development of new energy industries such as energy storage and charging piles, the demand for solid-state transformers is gradually increasing, placing higher demands on product standardization and modular design. Traditional outdoor solid-state transformers are in the form of containers (or prefabricated cabins), with a large overall size, poor spatial layout flexibility, and significant internal space waste. They are heavy, have slow processing cycles, require hoisting, and are costly. Furthermore, the existing split-cabinet design presents problems such as assembly, dust and water resistance, and heat dissipation that urgently need to be addressed. Among these, waterproofing is currently the biggest technical challenge for outdoor split-cabinets. The connections of cables and copper busbars in each split-cabinet can compromise its waterproof sealing performance. Currently available through-wall copper busbars and waterproof cables cannot be used in existing parallel cabinet designs, failing to meet waterproofing and dustproofing requirements, and their installation dimensions are incompatible with the split-cabinets. Some through-wall copper busbars can only meet protection requirements on one side, have directional installation requirements, and lack versatility. Existing waterproof cables only prevent liquid from entering the cable itself, but cannot guarantee the sealing of the split-cabinet. Utility Model Content

[0003] This utility model provides a cabinet-type outdoor solid-state transformer, the purpose of which is to solve the technical problem of poor waterproof performance in the outdoor application of the existing cabinet-type transformer.

[0004] This utility model provides a cabinet-type outdoor solid-state transformer, including multiple cabinets connected in sequence. Each cabinet is provided with multiple secondary cables and copper busbars. Each secondary cable is covered with a first waterproof structure, which includes an installation sleeve, a cable sleeve, and a waterproof component. The installation sleeve is fixedly connected to the side wall of the cabinet. The cable sleeve passes through the installation sleeve of two connected cabinets. The waterproof component is fixedly connected between the installation sleeve and the cable sleeve.

[0005] Furthermore, each of the mounting sleeves is fixedly connected to the opposite sides of two adjacent split cabinets. The mounting sleeve is a hollow frustum structure, and the larger diameter end of the frustum structure is connected to the side wall of the split cabinet.

[0006] Furthermore, the end of the mounting sleeve away from the split cabinet retracts towards the axis. The waterproof component includes a mounting ring platform. A nut is fixedly connected to the retracted end of the inner wall of the mounting sleeve. A limiting ring platform is provided on the outer surface of the mounting ring platform. External threads are respectively opened at both ends of the outer surface of the mounting ring platform, and the two sections of the external threads are opened on both sides of the limiting ring platform. The nut is fixedly connected to the mounting ring platform by threads, and the retracted end of the mounting sleeve is clamped between the nut and the limiting ring platform.

[0007] Furthermore, a pressure cap is threadedly fixed to the outer side of the mounting ring platform away from the nut. An elastic rubber ring abuts against the inner side of the pressure cap and the inner side of the mounting ring platform near the pressure cap. The elastic rubber ring is fixedly connected to the outside of the cable sleeve. The cable sleeve is sequentially inserted through the nut, the mounting ring platform, the elastic rubber ring, and the pressure cap.

[0008] Furthermore, each of the copper busbars is provided with a second waterproof structure, and each of the second waterproof structures is fixedly connected between each of the separate cabinets. The second waterproof structure includes a recessed fixing seat disposed between two separate cabinets; the copper busbar passes through the recessed fixing seat, and multiple fasteners are connected between the copper busbar and the recessed fixing seat; an insulating shell is provided in the middle of the copper busbar, and the insulating shell abuts against the inner wall of the recessed fixing seat.

[0009] Furthermore, the insulating outer shell is provided with water guide grooves on both sides of the recessed fixing seat.

[0010] Furthermore, the insulating outer shell has multiple annular insulating grooves circumferentially formed on its side surface.

[0011] This utility model has at least the following beneficial effects:

[0012] This utility model provides a cabinet-type outdoor solid-state transformer. The first waterproof structure forms a physical isolation layer through the nested design of the installation sleeve and cable sleeve, which, together with the waterproof components, can resist rainwater penetration and moisture erosion. The second waterproof structure fully encloses the copper busbar for protection, effectively preventing metal oxidation and electrochemical corrosion. This solves the technical problem of poor waterproof performance in existing cabinet-type outdoor applications.

[0013] This invention provides a cabinet-type outdoor solid-state transformer. The cabinets adopt a standardized interface design, and capacity expansion can be achieved by increasing or decreasing the number of cabinets. The waterproof connection structure of the copper busbars and cables uses prefabricated components, requiring only modular splicing during on-site installation, thus improving construction efficiency. It is particularly suitable for power grid renovation scenarios requiring phased capacity expansion and outdoor applications.

[0014] This utility model provides a cabinet-type outdoor solid-state transformer with a modular architecture, high protection design, and a combination of standardized and customized strategies. It solves the problems of rigid configuration, insufficient waterproofing and dustproofing, and difficult maintenance of traditional outdoor transformers, and significantly improves the reliability, flexibility and environmental adaptability of the equipment. It is suitable for diverse outdoor scenarios such as power grids and industrial parks. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a cabinet-type outdoor solid-state transformer according to the present invention;

[0016] Figure 2 This is an exploded view of the first waterproof structure of a cabinet-type outdoor solid-state transformer according to this utility model;

[0017] Figure 3 An exploded view of the waterproof component of a cabinet-type outdoor solid-state transformer according to this utility model;

[0018] Figure 4 This is a schematic diagram of the second waterproof structure of a cabinet-type outdoor solid-state transformer according to the present invention;

[0019] Figure 5 This is a cross-sectional view of the second type of structure of a cabinet-type outdoor solid-state transformer according to this utility model;

[0020] In the diagram: 1. Split cabinet; 2. First waterproof structure; 3. Second waterproof structure; 4. Mounting sleeve; 5. Cable sleeve; 6. Waterproof component; 7. Mounting ring platform; 8. Nut; 9. Limiting ring platform; 10. Elastic rubber ring; 11. Pressure cap; 12. Recessed fixing seat; 13. Copper busbar; 14. Fastener; 15. Insulating shell; 16. Water guide groove; 17. Annular insulating groove; 18. Waist hole; 19. Through hole. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-3This utility model provides a cabinet-type outdoor solid-state transformer, comprising multiple sequentially connected outdoor cabinets 1, each cabinet 1 performing its own function. The cabinets are electrically or communicatively connected via pre-reserved copper busbars 13 or wiring holes. The entire unit consists of multiple cabinets 1, each of which can be a high-voltage incoming cabinet, metering cabinet, outgoing cabinet, high-voltage cabinet, power cabinet, or low-voltage cabinet; specific configurations can be selected according to customer needs. The high-voltage and power cabinets are standardized in design, while the low-voltage cabinet is the most customized part, with pre-reserved mounting holes inside. The specific design can be further refined according to customer requirements, allowing for advance material preparation for each cabinet. Each cabinet has pre-reserved connection holes at the top and bottom to ensure a good overall effect after parallel connection. The entire unit consists of multiple functionally independent cabinets 1 (high-voltage cabinet, power cabinet, low-voltage cabinet, etc.), supporting a combination of standardization and customization. The standardized design of the high-voltage and power cabinets shortens the production cycle; the pre-reserved mounting holes in the low-voltage cabinet allow for customized functional modules to meet diverse scenario requirements. Each cabinet can be prepared independently in advance and quickly assembled through the cabinet connection holes at the top and bottom, reducing warehousing and transportation costs and improving deployment efficiency.

[0023] Multiple secondary cables and copper busbars 13 are provided between each of the separate cabinets 1. Each secondary cable is covered with a first waterproof structure 2, and each first waterproof structure 2 is fixedly connected between each of the separate cabinets 1. Each copper busbar 13 is covered with a second waterproof structure, and each second waterproof structure is fixedly connected between each of the separate cabinets 1.

[0024] The first waterproof structure 2 includes two mounting sleeves 4, a cable sleeve 5, and two waterproof components 6. Each mounting sleeve 4 is fixedly connected to the opposite side of two adjacent split cabinets 1. The diameter of the end of the mounting sleeve 4 near the side surface of the split cabinet 1 is larger than the diameter of the end of the mounting sleeve 4 away from the side surface of the split cabinet 1. The vertical cross-section of each mounting sleeve 4 is an isosceles trapezoid. Each waterproof component 6 is fixedly connected to the end of the mounting sleeve 4 away from the split cabinet 1. The cable sleeve 5 is fixedly connected between the two waterproof components. The cable sleeve is sequentially inserted into the waterproof component 6, the two mounting sleeves 4, and the other waterproof component 6.

[0025] The second waterproof structure 3 includes a recessed fixing seat 12 between the split cabinets 1. The recessed fixing seat 12 is fixedly connected between two adjacent split cabinets 1. A copper busbar 13 is placed inside the recessed fixing seat 12, and the copper busbar 13 is tightly fixed to the cabinet body using fasteners 14. The copper busbars 13 on both sides are connected to other terminals or electrical components through holes, ensuring that the gap between the split cabinets 1 is small and the overall effect is good after the cabinets are connected. The fasteners 14 ensure the connectivity of the copper busbar 13 and improve the dustproof and waterproof performance.

[0026] When two adjacent modular cabinets 1 are assembled vertically side by side, the side walls of the modular cabinets 1 remain in a close fit. The vertical cross-section of each mounting sleeve 4 is an isosceles trapezoid. The angle between the side surface of the mounting sleeve 4 and the side wall of the modular cabinet 1 is not equal to 90°, and the two are not perpendicular. This makes the inclination angle of the inner side of the mounting sleeve 4 easy for water to drain and prevent water from entering the cabinet.

[0027] In this embodiment of the utility model, the end of the mounting sleeve 4 away from the split cabinet 1 contracts towards the axis. The waterproof component 6 includes a nut 8 and a mounting ring 7. The nut 8 is fixedly connected to the contracted end of the inner wall of the mounting sleeve 4. The mounting ring 7 is an annular mounting ring 7, and a limiting ring 9 is provided on the outer surface of the mounting ring 7. External threads are respectively provided at both ends of the limiting ring 9 on the outer surface of the mounting ring 7. The nut 8 is fixedly connected to the mounting ring 7. The contracted end of the mounting sleeve 4 is clamped between the nut 8 and the limiting ring 9. The cable sleeve 5 passes through the mounting ring 7. A rubber ring is provided on the side of the external thread near the mounting sleeve 4, and the contracted end of the mounting sleeve 4 abuts against the rubber ring.

[0028] In this embodiment of the invention, a pressure cap 11 is threadedly connected to the outer surface of the mounting ring 7 away from the nut 8. An elastic rubber ring 10 is provided inside the mounting ring 7, and the cable sleeve 5 passes through the elastic rubber tube. The cable sleeve 5 is connected to the mounting ring 7 via an interference fit with the elastic rubber ring 10 and the high friction of the elastic rubber ring 10 itself. The elastic rubber ring 10 provides waterproof and moisture-proof capabilities, preventing water vapor from flowing between the cabinets 1. The elastic rubber ring 10 is made of modified rubber, and the cable sleeve 5 is made of PVC, achieving a waterproof rating of IP68 in actual tests. By rotating and squeezing the internal elastic rubber ring 10, the cable sleeve 5 is locked to ensure waterproofing. The diameter of the cable sleeve 5 is within the clamping range of the mounting ring 7, and the inner diameter of the mounting ring 7 meets the requirements for the number of cables between cabinets and the diameter of the cable sleeve 5.

[0029] As an optional embodiment, the inner diameter of the side of the mounting ring 7 connected to the pressure cap 11 is larger than the inner diameter of the side of the mounting ring 7 connected to the nut 8; this facilitates the installation of the elastic rubber ring 10.

[0030] In this embodiment of the invention, the outer surface of the copper busbar 13 is designed with an insulating shell 15, a sealing strip, and a threaded sleeve for installation. The copper busbar 13 has a symmetrical structure and is made of copper or aluminum. Surface treatment improves corrosion resistance and conductivity. The copper busbar 13 has slotted holes 18 at both ends for connecting other terminals or devices, which can compensate for some installation errors. The slotted holes 18 can be round holes or other types of mounting holes, and their size can be selected according to actual design and installation requirements. The copper busbar 13 is covered with an insulating shell 15, which is made of epoxy resin or sheet-like plastic. It is integrally injection molded with the copper busbar 13 and the threaded sleeve using an insert molding process, ensuring a tight fit between the insulating shell 15 and the copper busbar 13, achieving waterproof and dustproof requirements. The sealing strip is installed in the slot, and sealing strips of different thicknesses can be replaced according to the actual installation situation. The threaded sleeves embedded in the insulating housing 15 are evenly distributed on the mounting end face to ensure the installation and fixation of the copper busbar 13 to the cabinet side panel. During the tightening process, the sealing strip is compressed to form a sealed shape, which serves to prevent water and dust. The insulating housing 15 is used to fix the position of the copper busbar 13 and can be used as a movable core, which can be replaced according to design requirements to match copper busbars 13 with different cross-sections. The annular insulating groove 17 on the insulating housing 15 can have other shapes, such as a wall-shaped or V-groove shape. This feature not only increases the creepage distance, but also guides rainwater flowing into the annular insulating groove 17 through the gap between the cabinets, preventing the water from flowing laterally and causing damage to internal electrical components or circuits, further improving the waterproof and dustproof performance. The insulating outer shell 15 has two mounting end faces facing the recessed fixing seat 12 of the split cabinet 1 and the recessed fixing seat 12 of the split cabinet 1, respectively. The mounting end faces are provided with toothed sleeves for installing fastening components. A slot is formed at the bottom of the mounting end face, and an insulating strip is placed in each slot. After the fastener 14 is locked, the sealing strip can be effectively compressed to form a sealed space, providing protection. The insulating strip abuts against the edge of the through hole 19. The insulating outer shell 15 passes through the through hole 19 along the copper busbar 13. Water guide grooves 16 are circumferentially provided on both sides of the insulating outer shell 15 outside the recessed fixing seat 12. The slots on the insulating outer shell 15 are used for the installation and positioning of the sealing strip. This feature dimension can be adjusted and adapted according to the shape of the sealing strip, while also providing a secondary prevention of external water flow into the cabinet. The water guide grooves 16 on the insulating outer shell 15 are the third layer of waterproofing design inside the cabinet. The cross-section of the water guide groove 16 is not limited to this form, and the size can also be designed according to actual needs. The copper busbar 13 has a corrosion-resistant surface treatment, and the waist hole 18 design compensates for installation errors and ensures stable conductivity; the insulating shell 15 is integrally injection molded to increase the creepage distance and prevent short circuit risk.

[0031] In an embodiment of this utility model, multiple connectors are provided between two adjacent cabinets 1. These connectors are right-angle connectors, and each connector is fixedly connected to the edge of each cabinet 1 near the adjacent cabinet 1 by bolts. Two adjacent right-angle connectors are fixedly connected back-to-back by bolts. The cabinets 1 are arranged back-to-back with right-angle connectors and fixed with multiple bolts, ensuring a tight fit between the cabinet sidewalls, reducing gaps between cabinets, and resulting in a stable and aesthetically pleasing overall structure.

Claims

1. A cabinet-type outdoor solid-state transformer, characterized in that, The system includes multiple sequentially connected cabinets (1), with multiple secondary cables and copper busbars (13) arranged between each cabinet (1). Each secondary cable is covered with a first waterproof structure (2). The first waterproof structure (2) includes an installation sleeve (4), a cable sleeve (5), and a waterproof component (6). The installation sleeve (4) is fixedly connected to the side wall of the cabinet (1). The cable sleeve (5) passes through the installation sleeve (4) of two connected cabinets (1). The waterproof component (6) is fixedly connected between the installation sleeve (4) and the cable sleeve (5).

2. The cabinet-type outdoor solid-state transformer according to claim 1, characterized in that, Each of the mounting sleeves (4) is fixedly connected to the opposite side of two adjacent split cabinets (1). The mounting sleeve (4) is a hollow frustum structure, and the large-diameter end of the frustum structure is connected to the side wall of the split cabinet (1).

3. A cabinet-type outdoor solid-state transformer according to claim 2, characterized in that, The end of the mounting sleeve (4) away from the split cabinet (1) retracts towards the axis. The waterproof component (6) includes a mounting ring platform (7). A nut (8) is fixedly connected to the retracted end of the inner wall of the mounting sleeve (4). A limiting ring platform (9) is provided on the outer surface of the mounting ring platform (7). External threads are respectively opened at both ends of the outer surface of the mounting ring platform (7). The two external threads are opened on both sides of the limiting ring platform (9). The nut (8) is fixedly connected to the mounting ring platform (7) by threads. The retracted end of the mounting sleeve (4) is clamped between the nut (8) and the limiting ring platform (9).

4. A cabinet-type outdoor solid-state transformer according to claim 3, characterized in that, The mounting ring platform (7) is fixedly connected to a pressure cap (11) by a thread on the outer side of the end away from the nut (8). An elastic rubber ring (10) abuts against the inner side of the end of the mounting ring platform (7) near the pressure cap (11). The elastic rubber ring (10) is fixedly connected to the outside of the cable sleeve (5). The cable sleeve (5) is sequentially inserted into the nut (8), the mounting ring platform (7), the elastic rubber ring (10), and the pressure cap (11).

5. A cabinet-type outdoor solid-state transformer according to claim 1, characterized in that, Each of the copper busbars (13) is provided with a second waterproof structure, and each of the second waterproof structures is fixedly connected between each of the separate cabinets (1). The second waterproof structure includes a recessed fixing seat (12) disposed between two separate cabinets (1); the copper busbar (13) passes through the recessed fixing seat (12), and a plurality of fasteners (14) are connected between the copper busbar (13) and the recessed fixing seat (12). An insulating shell (15) is provided in the middle of the copper busbar (13), and the insulating shell (15) abuts against the inner wall of the recessed fixing seat (12).

6. A cabinet-type outdoor solid-state transformer according to claim 5, characterized in that, The insulating shell (15) is provided with water guide grooves (16) on both sides outside the recessed fixing seat (12).

7. A cabinet-type outdoor solid-state transformer according to claim 5, characterized in that, The insulating shell (15) has multiple annular insulating grooves (17) circumferentially formed on its side surface.

Images