A ring-type single-pole pole-mounted transformer

Abstract

This application provides a ring-type single-pole pole-mounted transformer, including a support rod, a transformer assembly, and a control unit. The support rod is fixed to the ground, the transformer assembly is disposed on the outer wall of the support rod, and the control unit is disposed on the support rod. The control unit is spaced apart from the transformer assembly, and the transformer assembly is electrically connected to the control unit. The transformer assembly includes three transformer cores, which are arranged sequentially along the circumference of the support rod. The transformer cores are wound cores. A 10kV cable located outside the support rod is bent at a 90° angle at its connection point with the high-voltage terminal of the transformer assembly. The circumferential dimension of the transformer core along the support rod is at least 15% smaller than the maximum circumferential dimension. The ring-type single-pole pole-mounted transformer provided by this application has the advantages of ensuring sufficient maintenance space and simplifying maintenance operations.

Description

Technical Field

[0001] This application relates to the field of transformer technology, and more specifically, to a ring-type single-pole pole-mounted transformer. Background Technology

[0002] With the rapid growth of urban electricity load and the continuous expansion of power supply areas, the addition and use of distribution transformers has become particularly critical. As the number of distribution transformers increases, existing ones also require necessary maintenance. However, rapid urbanization, limited space in commercial districts, and difficulties in coordinating with businesses have brought significant challenges to the deployment and maintenance of new distribution transformers. Existing distribution transformers are mostly installed using floor-mounted or suspended installation methods, occupying considerable space and making them unsuitable for installation in narrow streets or densely populated commercial areas. More importantly, they require ample operating space for maintenance, increasing both the difficulty and cost of maintenance.

[0003] The above problems urgently need to be addressed. Summary of the Invention

[0004] The purpose of this application is to provide a ring-type single-pole pole-mounted transformer, which has the advantages of ensuring sufficient maintenance space and simplifying maintenance operations.

[0005] The technical solution for achieving the objective of this invention is as follows:

[0006] A ring-shaped single-pole pole-mounted transformer includes a support rod, a transformer assembly, and a control unit. The support rod is fixed to the ground, the transformer assembly is disposed on the outer wall of the support rod, and the control unit is disposed on the support rod.

[0007] The control unit is separated from the transformer group, and the transformer group is electrically connected to the control unit;

[0008] The transformer group includes three transformer cores, which are arranged sequentially along the circumference of the support rod.

[0009] The transformer core is a wound core. The 10kV cable outside the support rod is bent at 90° at the connection point with the high-voltage terminal of the transformer group. The circumferential dimension of the transformer core along the support rod is at least 15% smaller than the maximum circumferential dimension.

[0010] A circumferential adjustment assembly is provided between the support rod and the transformer group. The circumferential adjustment assembly includes a telescopic positioning rod that can be extended and retracted along the circumference of the support rod, and a telescopic reinforcing rod connecting the ends of two adjacent telescopic positioning rods. There are three telescopic positioning rods, which are evenly arranged along the circumference of the support rod. Each telescopic positioning rod and each telescopic reinforcing rod is provided with a sliding groove. Each transformer core is provided with a slider at its bottom. The slider is slidably connected to the corresponding sliding groove and then fixed. The outer wall of the slider is provided with a wear-resistant coating, and a displacement sensor is embedded in the inner wall of the sliding groove.

[0011] The ring-type single-pole pole-mounted transformer provided in this application includes a support rod, a transformer assembly, and a control unit. The support rod is fixed to the ground and serves as a mounting carrier for other components. The transformer assembly is installed on the outer wall of the support rod, and the control unit is installed on the support rod, thus forming the basic structure of the transformer. A gap is left between the control unit and the transformer assembly, and the transformer assembly is electrically connected to the control unit. This allows for staggered installation between the major components and provides individual and sufficient maintenance space for each major component. The transformer assembly includes three transformer cores, which are arranged sequentially along the circumference of the support rod, thus forming a three-phase magnetic circuit. The transformer cores are wound cores. The 10kV cable located outside the support rod forms a 90° angle at the connection point between its body and the high-voltage terminal of the transformer assembly. With the bend design, the circumferential dimension of the transformer core along the support rod is reduced by at least 15% compared to the maximum circumferential dimension. The wound core is wound along the optimal magnetic conduction direction, resulting in strong integrity and no seams, which reduces no-load losses. At the same time, due to the more compact structure of the wound core, its noise level is also significantly reduced. Without affecting the conductivity and magnetic conductivity, the structural optimization reduces the occupancy of the transformer group in the circumferential space, freeing up more maintenance space for the staff and simplifying maintenance operations. Based on the above structure, the three-phase magnetic circuit formed by the transformer group is made independent, and the circumferential structure frees up more maintenance space, thus simplifying maintenance operations.

[0012] Furthermore, in this application, the transformer core is made of amorphous alloy, and the outer wall of the support rod is provided with an annular cable winding frame. The annular cable winding frame is located above the transformer assembly. The annular cable winding frame includes a rotating shaft rotatably mounted on the support rod, three winding arms uniformly connected to one end of the rotating shaft along the circumference of the support rod, and a winding motor drivingly connected to the other end of the rotating shaft. Each winding arm includes a first fixed arm arranged along the axial direction of the support rod and a second fixed arm rotatably connected to the first fixed arm. Both the first fixed arm and the second fixed arm are provided with insulating fixing clips, and the outer walls of both the first fixed arm and the second fixed arm are provided with guide grooves along the length direction of the body.

[0013] The ring-type single-pole pole-mounted transformer provided in this application has an amorphous alloy core. Based on the traditional wound core, by setting the core material to an amorphous alloy, the combination of amorphous alloy and three-dimensional wound core is achieved, thereby significantly reducing the overall size and weight of the transformer. This not only facilitates installation and transportation and improves the flexibility of equipment use, but also provides ample space for subsequent maintenance and repair, thus simplifying maintenance operations.

[0014] Furthermore, in this application, the end of the 10kV cable is connected to a T-type elbow-type fully insulated plug, and the interior of the T-type elbow-type fully insulated plug is provided with a European-style sleeve and a shield.

[0015] The ring-type single-pole pole-mounted transformer provided in this application has a T-type elbow-type fully insulated plug-in head connected to the end of the 10kV cable, which facilitates quick plug-in installation or efficient replacement between cables and simplifies maintenance operations. The T-type elbow-type fully insulated plug-in head is equipped with a European-style sleeve and shielding cover, which allows for plugging and unplugging while energizing the equipment. This simplifies maintenance operations while ensuring the safety of personnel during the maintenance process.

[0016] Furthermore, in this application, the T-type elbow-type fully insulated plug-in head is internally integrated with a high-voltage surge arrester, a live indicator, and a fault indicator.

[0017] Furthermore, in this application, the control unit includes a main switch cabinet and a JP cabinet, the main switch cabinet being disposed on the inner wall of the support rod, and the JP cabinet being disposed on the outer wall of the support rod.

[0018] Furthermore, in this application, the support rod is provided with an openable and closable inspection window at the position corresponding to the main switch cabinet, and the main switch cabinet is connected to the inner wall of the support rod by a telescopic guide rail, the position of the telescopic guide rail corresponding to the position of the inspection window.

[0019] Furthermore, in this application, the JP cabinet is a three-layer drawer-type slide rail structure, and the JP cabinet includes a first drawer, a second drawer, and a third drawer that slide from top to bottom;

[0020] The first drawer is equipped with a 0.4kV incoming line and a main circuit breaker, and the back of the first drawer is equipped with a corresponding blind-plug busbar.

[0021] The second drawer is equipped with a reactive power compensation module and a filtering module, and the back of the second drawer is equipped with a corresponding blind-plug busbar.

[0022] The third drawer is equipped with outgoing lines and a circuit breaker group, and the back of the third drawer is equipped with a corresponding blind-plug busbar.

[0023] Furthermore, in this application, the outgoing line of the JP cabinet is a multi-port composite cable, and the end of the JP cabinet is a quick-connect connector.

[0024] Furthermore, in this application, the main circuit breaker is internally equipped with a vacuum interrupter and a solid-state relay connected in parallel.

[0025] Furthermore, in this application, the third drawer has an internal optical fiber, the second drawer has an edge gateway for uploading load curves and lifetime prediction, the JP cabinet has an external NFC module, the edge gateway, the optical fiber, and the NFC module are electrically connected, and the NFC module has an NFC electronic tag on the outside of the JP cabinet.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: The ring-shaped single-pole pole-mounted transformer provided in this application includes a support rod, a transformer group, and a control unit. The support rod is fixed to the ground and serves as a mounting carrier for other components. The transformer group is disposed on the outer wall of the support rod, and the control unit is disposed on the support rod, thereby forming the basic structure of the transformer. A gap is left between the control unit and the transformer group, and the transformer group is electrically connected to the control unit, which is used to achieve staggered installation between the major components, while providing separate and sufficient maintenance space for each major component. The transformer group includes three transformer cores, which are arranged sequentially along the circumference of the support rod, thereby forming a three-phase magnetic circuit. The core is a wound core. The 10kV cable, located outside the support rod, is bent at a 90° angle at its connection to the high-voltage terminal of the transformer. The circumferential dimension of the transformer core along the support rod is at least 15% smaller than the maximum circumferential dimension. The wound core is wound along the optimal magnetic conductivity direction, resulting in strong integrity and no seams, thus reducing no-load losses. Furthermore, the more compact structure of the wound core significantly reduces noise levels. Without affecting conductivity and magnetic conductivity, structural optimization reduces the circumferential space occupied by the transformer, providing more maintenance space for the transformer with its encircling structure and facilitating maintenance. To simplify maintenance operations, the three-phase magnetic circuits of the transformer unit are made independent based on the aforementioned structure. This frees up more maintenance space within the enclosed structure, simplifying maintenance procedures. The transformer core is made of amorphous alloy. Building upon the existing wound core design, the use of an amorphous alloy combines amorphous alloy with a three-dimensional wound core, significantly reducing the overall size and weight of the transformer. This not only facilitates installation and transportation and improves the equipment's operational flexibility but also provides ample space for subsequent maintenance, further simplifying maintenance operations. The 10kV cable ends are connected with T-shaped... Elbow-type fully insulated plug-in heads facilitate quick connection and installation or efficient replacement of cables, simplifying maintenance operations. The T-type elbow-type fully insulated plug-in heads feature European-style sleeves and shielding covers, enabling live plugging and unplugging. This simplifies maintenance operations while ensuring the safety of personnel during the maintenance process. Compared to floor-mounted or suspended installation methods, this application uses a support rod as the core carrier structure, with the transformer group arranged circumferentially on the support rod. This reduces the space occupied by the transformer group during installation. With the reduced space requirement, even in narrow streets or densely populated commercial areas, the transformer structure can be installed using limited space.

[0027] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing embodiments of this application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings. Attached Figure Description

[0028] Figure 1 This application provides a structural schematic diagram of a ring-shaped single-pole pole-mounted transformer;

[0029] Figure 2 A schematic diagram of the JP cabinet for a ring-type single-pole pole-mounted transformer provided in this application;

[0030] Figure 3 A schematic diagram of the structure of a T-type elbow-type fully insulated plug-in head for a ring-type single-pole pole-mounted transformer provided in this application;

[0031] Figure 4 A top view of the surround adjustment assembly of a ring-type single-pole transformer provided in this application;

[0032] Figure 5 One of the structural schematic diagrams of a ring-shaped cable bundle frame for a ring-type single-pole transformer provided in this application;

[0033] Figure 6 A second schematic diagram of the structure of a ring-shaped cable bundle frame for a single-pole transformer provided in this application;

[0034] Figure 7 For this application Figure 6 A magnified view of section A in the image.

[0035] In the diagram: 1. Support rod; 2. Transformer group; 3. JP cabinet; 301. First drawer; 302. Second drawer; 303. Third drawer; 4. Ground; 5. Main switch cabinet; 6. Inspection window; 7. NFC electronic tag; 8. 0.4kV incoming line; 9. Main circuit breaker; 10. Reactive power compensation module; 11. Filter module; 12. Outgoing line; 13. Circuit breaker group; 14. T-type elbow type fully insulated plug; 15. High-voltage surge arrester; 16. Live indicator 17. Fault indicator; 18. European-style sleeve; 19. Shielding cover; 20. Vacuum interrupter; 21. Solid-state relay; 22. Telescopic positioning rod; 23. Telescopic reinforcing rod; 24. Slide groove; 25. Displacement sensor; 26. Ring cable bundler; 27. Rotary shaft; 28. Bundle arm; 29. ​​First fixed arm; 30. Second fixed arm; 31. Insulating fixing clamp; 32. Guide groove; 33. Polytetrafluoroethylene wear-resistant strip; 34. Fluororubber buffer pad. Detailed Implementation

[0036] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0037] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] With the rapid growth of urban power load and the continuous expansion of power supply coverage, the addition and use of distribution transformers has become particularly critical. As the number of distribution transformers increases, existing ones also require necessary maintenance. However, rapid urbanization, limited space in commercial districts, and difficulties in coordinating with businesses have brought significant challenges to the new installation and maintenance of distribution transformers. Existing distribution transformers are mostly installed using floor-mounted or suspended installation methods, occupying considerable space and making it difficult to meet installation requirements in narrow streets or densely populated commercial areas. More importantly, maintenance requires significant operating space, increasing maintenance difficulty and costs. To address these issues, this application provides a ring-type single-pole pole-mounted transformer. Please refer to... Figures 1 to 7As shown, the system includes a support rod 1, a transformer assembly 2, and a control unit. The support rod 1 is fixed to the ground 4 and serves as a mounting carrier for other components. The transformer assembly 2 is located on the outer wall of the support rod 1, and the control unit is mounted on the support rod 1, thus forming the basic structure of the transformer. A gap exists between the control unit and the transformer assembly 2, and the transformer assembly 2 is electrically connected to the control unit to allow for staggered installation of the major components. Specifically, the transformer assembly 2 is positioned above the support rod 1, the main switch cabinet 5 included in the control unit is located inside the support rod 1, and the JP cabinet 3 included in the control unit is located outside the support rod 1. 2. The heights of the main switchgear 5 and JP cabinet 3 gradually decrease from top to bottom. Firstly, the transformer group 2 is located on the upper part of the support rod 1, which enhances safety. Secondly, as a frequently inspected and maintained object, JP cabinet 3 is located outside the support rod 1 at a relatively low height, making it convenient for staff to inspect and maintain. The main switchgear 5 is at a moderate height and located inside the support rod 1, which provides good protection and also makes it convenient for staff to inspect and maintain. In this way, the staggered installation of the main components is achieved, while providing each main component with its own and sufficient maintenance space, avoiding the waste of circumferential space centered on the support rod 1 due to stacking.

[0039] The transformer group 2 includes three transformer cores, which are arranged sequentially along the circumference of the support rod 1. In this embodiment, the transformer group 2 is specifically a three-phase transformer group, which is a three-phase transformer group formed by connecting three single-phase transformers. Correspondingly, the three-phase transformer group has three primary windings and three secondary windings. Each winding is installed on its corresponding transformer core according to the existing transformer winding method. Each winding is internally connected according to the existing transformer circuit connection method, thereby forming a three-phase magnetic circuit. In this embodiment, when the three-phase magnetic circuit fails, each unit in the group can be replaced individually. That is, maintenance can be carried out on the single transformer core and its corresponding winding that has failed, avoiding the need to replace the entire structure due to a single fault. This makes the three-phase magnetic circuit formed by the transformer group 2 independent, freeing up more maintenance space on the basis of the enclosed structure and simplifying the maintenance operation.

[0040] The transformer core is a wound core. The 10kV cable on the outside of the support rod 1 is bent at 90° at the connection point with the high-voltage terminal of the transformer group 2. This design allows the 10kV cable to be more compact near the transformer group 2, preventing it from spreading out as in traditional connections. The 90° bend makes the cable more integrated with the transformer group 2 without affecting the circuit connection, thus saving more space for maintenance and allowing for easier repairs. The transformer core extends circumferentially along the support rod 1. The surrounding dimension is reduced by at least 15% relative to the maximum surrounding dimension. Specifically, the transformer core is arranged in a surrounding structure, that is, it is evenly arranged around the support rod 1. In the process of forming the surrounding installation structure of the transformer core, the distance between the transformer core and the support rod 1 is not a unique fixed value. The distance between the transformer core and the support rod 1 refers to the distance between the transformer core and the support rod 1, which is the radius of the circle formed by the transformer core being evenly arranged around the support rod 1 from the perspective of geometry and top view. The center of the cross-section of the support rod 1 is regarded as the center of the circle.In actual installation, the radius of this circle, which is the distance between the center of the cross-section of the transformer core and the support rod 1, has a maximum value and a minimum value. Choosing one of these values ​​within the range of the maximum and minimum values ​​as the distance between the transformer core and the support rod 1 for actual installation will form a ring-shaped transformer core structure. When the distance between the transformer core and the support rod 1 is greater than the maximum value, it occupies too much space and affects the circuit connection; when the distance is less than the minimum value, the structure is too compact and affects the circuit connection. Both situations will lead to installation difficulties and circuit connection problems. The electrical conduction effect after connection is poor. Therefore, by setting the circumferential dimension of the transformer core along support rod 1 to be at least 15% smaller than the maximum circumferential dimension, a value within the range of minimum to maximum × 85% is selected as the distance between the transformer core and support rod 1. This satisfies both the circuit connection and output functions while reducing the space occupied by the transformer core after surrounding support rod 1. This reduces the circumferential space occupied by the transformer core, making it more compact and concentrated around support rod 1. This reduces the circumferential space occupied by transformer group 2, freeing up more space for the workers to work with the surrounding structure of transformer group 2. The ample maintenance space facilitates simplified maintenance operations. The coiled core is wound along the optimal magnetic direction, which perfectly aligns with the rolling direction (fiber direction) of the silicon steel sheet. This is based on the magnetic anisotropy of the silicon steel sheet (the main material of the coiled core): during rolling, the internal crystal structure aligns along the rolling direction, maximizing permeability and minimizing hysteresis and eddy current losses, resulting in optimal magnetic properties. Therefore, this direction is the optimal magnetic direction for the coiled core. This structure contributes to the coiled core's strong integrity and seamless construction. It features reduced no-load loss, and due to the more compact structure of the wound core, its noise level is also significantly reduced. Without affecting conductivity and magnetic permeability, through the above structural optimizations—that is, under the same rated capacity, the magnetic reluctance of the wound core is reduced and the effective cross-sectional area is increased—no-load loss is reduced. This is particularly suitable for small transformers, especially single-phase column-mounted transformers. More specifically, the wound core has a large lamination factor and less magnetic leakage. Furthermore, the wound core is lighter for the same capacity, making it more suitable for using thin silicon steel sheets, reducing material stacking losses and thus better achieving low-loss performance, resulting in even lower losses. In addition, compared to floor-mounted or suspended installation methods, this application uses a support rod 1 as the core carrier structure, with the transformer group 2 arranged circumferentially on the support rod 1. This reduces the space occupied by the transformer group 2 during installation. With the reduced space, even in narrow streets or densely populated commercial areas, the transformer structure can be conveniently installed using limited space.In this embodiment, the 10kV cable is arranged on the outside of the support rod 1 along the axial direction of the support rod 1 to facilitate the maintenance and replacement of the line, while avoiding excessive intersection with other lines, which could lead to poor heat dissipation or confusion.

[0041] In this embodiment, a circumferential adjustment assembly is provided between the support rod 1 and the transformer group 2. The circumferential adjustment assembly includes telescopic positioning rods 22 that can be extended and retracted circumferentially along the support rod 1, and telescopic reinforcing rods 23 connecting the ends of two adjacent telescopic positioning rods 22. There are three telescopic positioning rods 22, evenly arranged circumferentially along the support rod 1. The telescopic positioning rods 22 provide specific dimensional adjustment for the circumferential structure installation of the transformer group 2, i.e., the extension length of the telescopic positioning rods 22 is determined according to the actual installation space, ensuring that the transformer group 2 can be installed with sufficient maintenance space. The telescopic reinforcing rods 23 are used to improve the structural strength of the telescopic positioning rods 22, while ensuring that the angle between the telescopic positioning rods 22 remains unchanged to prevent the transformer from... Group 2 experiences spatial position changes. Furthermore, once the telescopic reinforcing rod 23, along with the telescopic positioning rod 22, has adjusted its telescopic length according to the actual installation scenario, locking the telescopic reinforcing rod 23 achieves a double locking of the telescopic positioning rod 22 and the telescopic reinforcing rod 23. This is because each telescopic reinforcing rod 23 and its two adjacent telescopic positioning rods 22 together form a geometric triangle structure. When the telescopic reinforcing rod 23, which is the base of the geometric triangle, is locked in place, the position of the support rod 1, which is the vertex of the geometric triangle, remains unchanged. Therefore, the two telescopic positioning rods 22, which are the other two sides of the geometric triangle, cannot change their length. This ensures that the transformer group 2 installed on the surrounding adjustment assembly is always in an accurate and constant position, guaranteeing both stable circuit transmission and... To ensure sufficient maintenance space, each telescopic positioning rod 22 and telescopic reinforcing rod 23 is equipped with a sliding groove 24, and each transformer core has a slider at its bottom. The slider is fixed after sliding connection with the corresponding sliding groove 24. In actual installation, the transformer core slides to the target position via the slider. This target position can be located on either the telescopic positioning rod 22 or the telescopic reinforcing rod 23. After the transformer core reaches the target position, the slider is fixed to the sliding groove 24. In this embodiment, as one of the optional fixing structures, pin holes are opened at the bottom of the slider and the bottom of the sliding groove 24. After the slider reaches the target position, the limiting pin is inserted into the pin hole at the bottom of the sliding groove 24 and the pin hole at the bottom of the slider in sequence to achieve limiting fixation, so that the transformer group 2 can be successfully installed. The outer wall of the slider A wear-resistant coating is provided to reduce friction loss. A displacement sensor 25 is embedded in the inner wall of the slide groove 24 to monitor the position of the transformer core in real time. This makes the installation operation more accurate and convenient, and ensures that the transformer core is always in the correct spatial position after successful installation, avoiding increased space occupation and circuit power consumption due to changes in the position of the transformer core. The installation carrier, which is formed by setting telescopic positioning rods 22 and telescopic reinforcing rods 23, makes the installation of transformer group 2 more convenient and accurate. At the same time, the installation size can be determined according to the actual installation scenario by adjusting the telescopic positioning rods 22 and telescopic reinforcing rods 23, thereby ensuring sufficient maintenance space and simplifying maintenance operations.

[0042] More specifically, in actual installation and use, the transformer core can be installed at the end of the telescopic positioning rod 22. At this point, the transformer core is located at the edge of the surrounding adjustment assembly. This installation structure reduces the unused space occupied by the surrounding adjustment assembly. From a top-down view, the coverage area formed by the support rod 1 as the geometric center and the transformer core as the edge completely covers the surrounding adjustment assembly. The surrounding adjustment assembly, located within this coverage area, not only provides strong support for the transformer core but also avoids excessive space occupation by extending beyond it, thus freeing up more maintenance space and facilitating maintenance operations. When the power load changes, the installation position of the transformer core can be adjusted by sliding to dynamically adjust the magnetic circuit spacing, ensuring the transformer core is always maintained in a state of minimum loss. Compared to a single, unchanging structure with a fixed spacing over a long period, the installation structure of sliding adjustment followed by fixing further reduces the no-load loss of the transformer core.

[0043] In some preferred embodiments, the transformer core is made of an amorphous alloy. Based on the transformer core being a wound core, by setting the material of the transformer core to an amorphous alloy, the combination of amorphous alloy and three-dimensional wound core is achieved, thereby significantly reducing the overall volume and weight of the transformer. This not only facilitates installation and transportation and improves the flexibility of equipment use, but also reserves sufficient space for subsequent maintenance and repair during use, thus simplifying maintenance operations. A ring-shaped cable coiling frame 26 is provided on the outer wall of the support rod 1. The ring-shaped cable coiling frame 26 is located above the transformer group 2. The ring-shaped cable coiling frame 26 includes a rotating shaft 27 rotatably mounted on the support rod 1, three coiling arms 28 evenly connected to one end of the rotating shaft 27 along the circumference of the support rod 1, and a coiling motor (not shown in the figure) drivingly connected to the other end of the rotating shaft 27. Each coiling arm 28 includes a first fixed arm 29 arranged along the axial direction of the support rod 1 and a second fixed arm 30 rotatably connected to the first fixed arm 29. Both the first fixed arm 29 and the second fixed arm 30 are provided with insulating fixing clips 31. The outer walls of the first fixed arm 29 and the second fixed arm 30 are provided with guide grooves 32 along the length direction of the body. The first fixed arm 29 is parallel to or at a certain angle along the direction of the support rod 1. The angle between the second fixed arm 30 and the first fixed arm 29 is adjusted and determined according to the actual storage requirements. Through the above structure, multiple cables used for electrical connection of the transformer group 2 and other components can be stored according to the actual distance. Within the nearby coiling arm 28, the guide groove 32 provides a accommodating and guiding function for the cables, preventing them from deviating from the coiling arm 28. Simultaneously, the guide groove 32 restricts radial displacement of the cables, preventing multiple cables from tangling and ensuring neat coiling. The insulating clamp 31 secures the cables, preventing them from scattering or spilling out. When maintenance is not required, the coiling motor rotates the coiling arm 28, causing it to retract. During rotation, the cables slide along the guide groove 32, achieving taut and neat coiling as the coiling arm 28 rotates, reducing the space occupied by the cables. At this time, the angle between the coiling arm 28 and the support rod 1 is 30°, allowing the cables to hang naturally for heat dissipation while taut. When maintenance is required, the coiling motor rotates the coiling arm 28, causing it to unfold, loosening the multiple cables. The angle between the coiling arm 28 and the support rod 1 is 120°. As the cables move away from the transformer group 2, they also become looser, providing maintenance space for personnel. The angle between the retracting arm 28 and the support rod 1 refers to the angle between the first fixed arm 29 and the support rod 1. Preferably, the first fixed arm 29 and the rotating shaft 27 are rotatably configured so that when the retracting arm 28 is in an unfolded or retracted position, the angle between the first fixed arm 29 and the rotating shaft 27 can be adjusted to the corresponding value to provide sufficient maintenance space or neatly store the cable.

[0044] More specifically, when the telescopic positioning rod 22 reduces the space occupied during the installation of transformer group 2, the cable has more remaining length and appears looser and more scattered. At this time, the three tightening arms 28 form a circumferential embrace to store the cable. The positions of the three tightening arms 28 can correspond to the positions of the three transformer cores to achieve the best tightening effect. By rotating and adjusting the second fixed arm 30, the angle between it and the first fixed arm 29 can be changed according to the actual maintenance or storage needs, providing greater convenience for cable storage and providing sufficient space for staff to maintain transformer group 2. In this embodiment, the surface of the retracting arm 28 is coated with a polyimide insulating coating, and a polytetrafluoroethylene wear-resistant strip 33 is attached to the guide groove 32. This reduces wear when the cable slides along the guide groove 32, while ensuring the insulation performance of the retracting arm 28 and preventing it from interfering with the circuit or posing a safety hazard. A fluororubber buffer pad 34 is attached to the insulating clamp 31. The surface of the fluororubber buffer pad 34 is provided with anti-slip texture, which increases the friction between the cable and the insulating clamp 31, preventing the cable from sliding off-center, and also avoids wear of the insulation layer caused by hard contact between the insulating clamp 31 and the cable when the retracting arm 28 moves.

[0045] In practical applications, as mentioned above, the position of the ring cable bundle 26 can be above the transformer group 2, or correspondingly, below the transformer group 2. The specific position of the ring cable bundle 26 needs to be determined based on factors such as the actual electrical layout, cable routing, and ease of maintenance. Specifically, in some cases, the ring cable bundle 26 needs to be placed above the transformer group 2. For example, when the cable enters the transformer group 2 from above, placing the ring cable bundle 26 above facilitates cable management and fixing, allowing the cable to neatly transition from the ring cable bundle 26 to the terminals of the transformer group 2, while also effectively utilizing... The space above prevents cables from piling up on the ground or around the transformer. In other scenarios, the ring cable bundle 26 needs to be placed below the transformer group 2. For example, when the cable is introduced into the transformer group 2 from the underground cable trench, placing the ring cable bundle 26 below the transformer group 2 can better guide the cable from the underground cable to the connection position of the transformer group 2. The ring cable bundle 26 below can provide a stable support point for the cable, preventing the cable from being damaged by its own weight or other external forces. In addition, placing the ring cable bundle 26 below also makes it easier for workers to carry out inspection and maintenance operations on the ground without having to climb to a height, thus improving the safety and convenience of maintenance.

[0046] In some preferred embodiments, the end of the 10kV cable is connected to a T-type elbow-type fully insulated plug 14, and the interior of the T-type elbow-type fully insulated plug 14 is provided with a European-style sleeve 18 and a shield 19.

[0047] Specifically, the 10kV cable is connected to a T-type elbow-type fully insulated plug-in head 14 at its end. This head has multiple connectors, allowing for selection of the appropriate connector for the corresponding cable, facilitating quick connection and installation or efficient replacement of cables and simplifying maintenance operations. The T-type elbow-type fully insulated plug-in head 14 internally features a European-style sleeve 18 and a shielding cover 19, enabling live plugging and unplugging while simplifying maintenance operations and ensuring the safety of personnel during the process. The European-style sleeve 18, a standard component, provides insulation, shielding, and waterproofing. It also expands the circuit during connection, meeting the needs of multiple power supply circuits. The shielding cover 19 prevents external electromagnetic interference to the internal circuitry, ensuring normal equipment operation, and also prevents internal electromagnetic radiation, reducing interference and impact on the outside world. The shielding cover 19, a standard component, is typically made of metal and serves to isolate interference from electric, magnetic, and electromagnetic fields. In this embodiment, the dual structure of the European sleeve 18 and the shield 19 enables the T-type elbow-type fully insulated plug-in head 14 to be plugged in and out while in power, avoiding a series of cumbersome power-off procedures and thus simplifying the maintenance work for the staff.

[0048] Specifically, to reduce exposed contacts and enhance the overall structural safety, in some preferred embodiments, the T-type elbow-type fully insulated plug-in connector 14 integrates a high-voltage surge arrester 15, a live indicator 16, and a fault indicator 17. This structure effectively utilizes the lightning protection and conductivity of the high-voltage surge arrester 15, the status display function of the live indicator 16, and the alarm function of the fault indicator 17. It also effectively protects these components from damage by external forces or long-term erosion by natural factors due to excessive exposure. The high-voltage surge arrester 15, as a standardized electrical device, is primarily used to protect power systems and equipment from lightning strikes and transient overvoltages. Its working principle is that when lightning or overvoltage occurs, the high-voltage surge arrester 15 quickly conducts, guiding the overvoltage to the ground, thereby limiting the voltage amplitude experienced by the equipment and protecting its safety. The live indicator 16, as a standardized component, is directly installed on the electrical equipment, specifically inside the T-type elbow-type fully insulated plug 14 in this embodiment. It serves as a visual indicator to show whether the T-type elbow-type fully insulated plug 14 carries operating voltage. Specifically, when the T-type elbow-type fully insulated plug 14 carries operating voltage, the display window of the live indicator 16 flashes, warning people that the high-voltage equipment is energized; when there is no voltage, there is no indication. The fault indicator 17 can identify and indicate short-circuit faults by detecting the characteristics of short-circuit current. It is an electromagnetic induction device that displays a fault sign (red sign) when a short-circuit current flows. The fault indicator 17 is installed inside the T-type elbow-type fully insulated plug 14. Once a line fault occurs and a short-circuit current flows, the fault indicator 17 activates, and the fault sign (red sign) appears. This structural design provides accurate judgment conditions for maintenance personnel, thereby simplifying maintenance operations. In this embodiment, the main body parts of the high-voltage surge arrester 15, the live indicator 16, and the fault indicator 17 are located inside the T-type elbow-type fully insulated plug 14, while their respective body parts for displaying status are embedded on the outer wall surface of the T-type elbow-type fully insulated plug 14, so that the staff can observe them intuitively and facilitate maintenance operations.

[0049] In some preferred embodiments, the control unit includes a main switch cabinet 5 and a JP cabinet 3. The main switch cabinet 5 is located on the inner wall of the support rod 1, which not only makes effective use of the internal space of the support rod 1, but also provides strong isolation and protection for the main switch cabinet 5, which is an important component, to prevent damage due to external forces or natural weather. The JP cabinet 3 is located on the outer wall of the support rod 1, which facilitates heat dissipation during use and provides convenience for the inspection and maintenance of the JP cabinet 3, that is, the staff can perform unobstructed inspection and maintenance operations on the JP cabinet 3 outside the support rod 1.

[0050] In some preferred embodiments, the support rod 1 is provided with an openable and closable inspection window 6 at the position corresponding to the main switch cabinet 5. The main switch cabinet 5 is connected to the inner wall of the support rod 1 via a telescopic guide rail, the position of which corresponds to the position of the inspection window 6. This allows staff to easily open or close the inspection window 6, enabling intuitive and convenient inspection and maintenance of the main switch cabinet 5 inside the support rod 1, simplifying maintenance operations. When it is necessary to replace large components inside the main switch cabinet 5, after opening the inspection window 6, the locking mechanism of the telescopic guide rail is released, and the main switch cabinet 5 is pulled outward to the outside of the support rod 1. After the component is replaced, it is pushed back to its original position without disassembling the outer wall of the support rod 1, simplifying maintenance operations.

[0051] As a crucial component of transformers, JP cabinet 3 has a very high usage rate in practical applications. To simplify maintenance operations efficiently, in some preferred embodiments, JP cabinet 3 features a three-layer drawer-type slide rail structure. This three-layer drawer-type slide rail design enables modularity of JP cabinet 3, allowing operators to perform more targeted maintenance operations, thereby improving maintenance efficiency. Furthermore, it facilitates heat dissipation during use, preventing insufficient or uneven heat dissipation that can occur with JP cabinet 3's integrated structure. Accordingly, JP cabinet 3 includes a first drawer 301, a second drawer 302, and a third drawer 303 that slide from top to bottom, forming a hierarchical and independent staggered structure that facilitates the division and individual setting of their respective functions. The first drawer 301 is equipped with a 0.4kV incoming line 8 and a main circuit breaker 9, enabling it to function as a transformer circuit connection. Simultaneously, the main circuit breaker 9 controls and protects the circuit, preventing overload or short circuit faults. The back of the first drawer 301 has corresponding blind-plug busbars for quick connection of the 0.4kV incoming line 8 and the main circuit breaker 9, facilitating efficient maintenance or replacement by staff. The second drawer 302 is equipped with a reactive power compensation module 10 and a filter module 11, used to improve the power factor, extend equipment life, improve power quality, increase load capacity, and improve energy conversion efficiency, specifically by reducing reactive power flow in the power grid and lowering equipment costs. The third drawer 302 has a blind-plug busbar on the back, which is used to quickly connect the reactive power compensation module 10 and the filter module 11, thereby facilitating efficient maintenance or replacement by staff. The third drawer 303 has a line outlet 12 and a circuit breaker group 13, which is used to complete the circuit connection and improve the circuit function of the transformer. At the same time, the circuit breaker group 13 provides line protection functions for each current branch, namely overload protection and short circuit protection. The third drawer 303 has a blind-plug busbar on the back, which is used to quickly connect the line outlet 12 and the circuit breaker group 13, thereby facilitating efficient maintenance or replacement by staff. In this embodiment, for the conventional electrical connection requirements of the transformer, the upper surface of the transformer group 2 is provided with an input terminal for connection to fuse-type components, and the lower surface of the transformer group 2 is provided with a grounding point for connection to the ground wire. The transformer core, the high-voltage terminal block and low-voltage terminal block of the transformer core, the main switch cabinet 5, the 10kV cable, the 0.4kV input line 8, and the output line are connected using existing transformer electrical connection technology to form a complete transformer connection circuit.

[0052] In some preferred embodiments, the outgoing line 12 of JP cabinet 3 is a multi-split composite cable, and the ends of JP cabinet 3 are quick-connect connectors. The outgoing line 12 of JP cabinet 3 is a multi-split composite cable, which has excellent electrical and mechanical properties. It can transmit optical signals via optical fiber for high-speed data communication, and also transmit electrical signals via cable to provide stable power support for the equipment. It can meet the multiple needs of simultaneously transmitting power and other data signals. The quick-connect connectors at the ends of JP cabinet 3 allow maintenance personnel to quickly assemble and disassemble components by performing a series of "alignment, snap-fit, and locking" operations, thus simplifying maintenance operations while ensuring that JP cabinet 3 has rich and complete circuit connections and transmission functions.

[0053] In some preferred embodiments, the main circuit breaker 9 is internally equipped with a vacuum interrupter 20 and a solid-state relay 21 connected in parallel, thereby achieving millisecond-level arc-free switching. Furthermore, this extends the equipment's service life by more than 5 times and reduces noise by 10 dB, simplifying maintenance operations while meeting the requirements of quiet urban areas. It should be noted that the vacuum interrupter 20, as a core component of the medium- and high-voltage power switch, primarily functions to quickly extinguish the arc and suppress current after the medium- and high-voltage circuit is cut off, preventing accidents and unforeseen events, thanks to the excellent insulation of the vacuum within the tube. The solid-state relay 21, as a contactless switch, is mainly used for signal control of the electrical isolation box. In this embodiment, the parallel structure of the two achieves millisecond-level arc-free switching, enabling faster response times for maintenance operations and avoiding prolonged delays. When personnel operate the main circuit breaker 9, the operation results are quickly fed back without delay, further simplifying maintenance operations.

[0054] In some preferred embodiments, the outlet 12 of the third drawer 303 is equipped with an optical fiber, the second drawer 302 is equipped with an edge gateway for uploading load curves and life prediction, and the JP cabinet 3 is equipped with an NFC module on the outside. The edge gateway, optical fiber, and NFC module are electrically connected. The NFC module is equipped with an NFC electronic tag 7 on the outside of the JP cabinet 3. With the above structure, the staff can read the load curve and realize life prediction by scanning the code without opening the JP cabinet 3. This simplifies the maintenance operation and improves the efficiency and accuracy of the staff in the maintenance of the transformer.

[0055] During the specific maintenance process, open the inspection window 6, unplug the T-type elbow-type fully insulated plug 14 of the 10kV cable, and then replace or test it. As needed, plug it back in and lock it in place to complete the maintenance of the 10kV cable. Disconnect the main switch, and achieve millisecond-level arc-free switching based on the parallel connection of the vacuum interrupter 20 and the solid-state relay 21. Then pull out the faulty JP cabinet 3, insert the spare JP cabinet 3 as needed, then fasten the corresponding blind-plug busbar, and finally close the circuit breaker to complete the maintenance of JP cabinet 3. The entire process takes only 3 minutes. Correspondingly, disconnect the corresponding main circuit breaker 9 or other circuit breaker group 13, unplug the quick-connect connector of the 0.4kV incoming line 8 or outgoing line 12, insert the new 0.4kV incoming line 8 or outgoing line 12 as needed, then lock it in place and close the circuit breaker to complete the maintenance of the 0.4kV incoming line 8 or outgoing line 12. Closing the circuit breaker refers to closing the corresponding switch or circuit breaker to bring the corresponding circuit into the connected state.

[0056] Through the above technical solution, the ring-shaped single-pole pole-mounted transformer provided in this application includes a support rod 1, a transformer group 2, and a control unit. The support rod 1 is fixed to the ground 4 and serves as a mounting carrier for other components. The transformer group 2 is disposed on the outer wall of the support rod 1, and the control unit is disposed on the support rod 1, thereby forming the basic structure of the transformer. A gap is left between the control unit and the transformer group 2, and the transformer group 2 is electrically connected to the control unit, which is used to achieve staggered installation between the major components and to provide separate and sufficient maintenance space for each major component. The transformer group 2 includes three transformer cores. The cores are sequentially arranged along the circumference of support rod 1, thus forming a three-phase magnetic circuit. The transformer core is a wound core. The 10kV cable outside support rod 1 is bent at 90° at the connection point with the high-voltage terminal of transformer group 2. The circumferential dimension of the transformer core along support rod 1 is at least 15% smaller than the maximum circumferential dimension. The wound core is wound along the optimal magnetic conductivity direction, resulting in strong integrity, no seams, and reduced no-load loss. Furthermore, due to the more compact structure of the wound core, its noise level is significantly reduced. This is achieved without affecting conductivity and magnetic conductivity. The structural optimization reduces the space occupied by transformer group 2 in the circumferential direction, freeing up more maintenance space for staff and simplifying maintenance operations. Based on the above structure, the three-phase magnetic circuit formed by transformer group 2 is made independent, further simplifying maintenance operations by freeing up more maintenance space within the circumferential structure. The transformer core is made of amorphous alloy. Building upon the existing wound core, the use of amorphous alloy as the core material achieves a combination of amorphous alloy and three-dimensional wound core, thus enhancing the overall quality of the transformer. The size and weight are significantly reduced, which not only facilitates installation and transportation and improves the flexibility of equipment use, but also provides ample space for subsequent maintenance and repair, thereby simplifying maintenance operations. The 10kV cable is connected to a T-type elbow-type fully insulated plug-in head 14, which facilitates quick plug-in installation or efficient replacement between cables and simplifies maintenance operations. The T-type elbow-type fully insulated plug-in head 14 is equipped with a European-style sleeve 18 and a shielding cover 19 inside, which enables plugging and unplugging while energizing. This simplifies maintenance operations while ensuring the safety of personnel during maintenance.

[0057] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A ring-type single pole pole-mounted transformer, characterized by, The utility model relates to a kind of transformer group and control unit, including support rod (1), transformer group (2) and control part, the support rod (1) is fixed to ground (4), the transformer group (2) is arranged in the outer wall of the support rod (1), the control part is arranged on the support rod (1); The control part is spaced from the transformer group (2), and the transformer group (2) is electrically connected with the control part; The transformer group (2) includes three transformer cores, and the three transformer cores are sequentially arranged along the circumference of the support rod (1); The transformer core is a roll core, and the 10kV cable outside the support rod (1) is arranged at 90° in the body part of the high-voltage terminal connection with the transformer group (2), and the circumferential size of the transformer core around the support rod (1) is at least 15% smaller than the maximum circumferential size. A surrounding adjustment assembly is arranged between the support rod (1) and the transformer group (2), the surrounding adjustment assembly includes telescopic positioning rods (22) that can be adjusted along the circumference of the support rod (1), and telescopic reinforcing rods (23) connected between the ends of two adjacent telescopic positioning rods (22), the number of telescopic positioning rods (22) is three and evenly arranged along the circumference of the support rod (1), each telescopic positioning rod (22) and telescopic reinforcing rod (23) is provided with a sliding groove (24), and the bottom of each transformer core is provided with a sliding block, the sliding block is fixed after being slidably connected with the corresponding sliding groove (24), the outer wall of the sliding block is provided with a wear-resistant coating, and a displacement sensor (25) is embedded in the inner wall of the sliding groove (24); the transformer core is arranged in the sliding groove (24) on the telescopic positioning rod (22) or the telescopic reinforcing rod (23) at the same time through the sliding block; The material of the transformer core is amorphous alloy, and the outer wall of the support rod (1) is provided with an annular cable collection frame (26), the annular cable collection frame (26) is located above the transformer group (2), the annular cable collection frame (26) includes a rotating shaft (27) rotatably arranged on the support rod (1), three collection arms (28) connected to one end of the rotating shaft (27) along the circumference of the support rod (1), a collection motor drivingly connected to the other end of the rotating shaft (27), each collection arm (28) includes a first fixed arm (29) arranged axially along the support rod (1), a second fixed arm (30) rotatably connected with the first fixed arm (29), the first fixed arm (29) and the second fixed arm (30) are provided with insulating fixed clamps (31), and the outer wall of the first fixed arm (29) and the second fixed arm (30) is provided with a guide groove (32) along the length direction of the body, and the first fixed arm (29) is rotatably arranged with the rotating shaft (27).

2. A ring-type single-phase pole-mounted transformer according to claim 1, characterized in that The end of the 10kv cable is connected with a T-shaped elbow full insulation plug (14), and a European sleeve (18) and a shielding cover (19) are arranged in the T-shaped elbow full insulation plug (14).

3. A single pole on pole transformer of the wrap around type according to claim 2, characterized in that, The T-shaped elbow full insulation plug (14) is internally integrated with a high-voltage lightning arrester (15), a live indicator (16) and a fault indicator (17).

4. A single pole on pole transformer of the wrap around type according to claim 1, characterized in that, The control part comprises a general switch cabinet (5) and a JP cabinet (3), the general switch cabinet (5) is arranged on the inner wall of the support rod (1), and the JP cabinet (3) is arranged on the outer wall of the support rod (1).

5. A single pole on pole transformer of the wrap around type according to claim 4, characterized in that, The support rod (1) is provided with an openable and closable maintenance window (6) at a position corresponding to the general switch cabinet (5), the general switch cabinet (5) is connected with the inner wall of the support rod (1) through a telescopic guide rail, and the position of the telescopic guide rail corresponds to the position of the maintenance window (6).

6. A self-contained single pole pole top transformer of claim 4 wherein, The JP cabinet (3) is a three-layer drawer type sliding rail structure, and comprises a first drawer (301), a second drawer (302) and a third drawer (303) arranged in sequence from top to bottom. The first drawer (301) is provided with a 0.4kv incoming line (8) and a general circuit breaker (9), and the back of the first drawer (301) is provided with a corresponding blind plug female busbar; The second drawer (302) is provided with a reactive power compensation module (10) and a filter module (11), and the back of the second drawer (302) is provided with a corresponding blind plug female busbar; The third drawer (303) is provided with an outgoing line (12) and a circuit breaker group (13), and the back of the third drawer (303) is provided with a corresponding blind plug female busbar.

7. A self-contained pole-mounted transformer according to claim 6, wherein The outgoing line (12) of the JP cabinet (3) is a one-drag-many composite cable, and the end of the JP cabinet (3) is a quick plug connector.

8. A self-contained single pole pole top transformer of claim 6 wherein, The general circuit breaker (9) is internally provided with a vacuum arc-extinguishing chamber (20) and a solid-state relay (21) connected in parallel.

9. A self-contained pole-mounted transformer according to claim 6, wherein, The outgoing line (12) of the third drawer (303) is internally provided with an optical fiber, the second drawer (302) is internally provided with an edge gateway for uploading load curve and life prediction, the JP cabinet (3) is externally provided with an NFC module, the edge gateway, the optical fiber and the NFC module are electrically connected, and the NFC module is externally provided with an NFC electronic tag (7).

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