A compact ring main unit for a power distribution ring network

Abstract

The application provides a compact looped netowrk cabinet for power distribution looped network, and relates to the technical field of looped network cabinets, which comprises a cabinet body, a mounting plate and a supporting base, the inner wall of the cabinet body is fixedly connected with an annular mounting frame, the annular mounting frame is provided with a mounting assembly for realizing rotation and switching of functional modules, the inner cavity of the cabinet body is provided with a wire fixing assembly for preventing cable winding, the bottom end of the mounting plate is fixedly connected with a first linear guide rail, and the top end of the supporting base is fixedly provided with a second linear guide rail, the functional units located in the deep interior are rotated to the front of the cabinet body through the rotation of the rotating tray, the operation space of the inner cavity of the compact looped network cabinet is avoided from being limited, and the problems of poor contact or faults are avoided, meanwhile, the electric energy of the static power supply is transmitted to the rotating part through the wire fixing assembly, the traditional wires are avoided from being broken due to twisting when rotating, and the problems of poor contact or faults caused by insufficient cable connection and adjustment space of the traditional compact looped network cabinet are also avoided.

Description

Technical Field

[0001] This invention relates to the field of ring main unit technology, and in particular to a compact ring main unit for power distribution ring networks. Background Technology

[0002] A distribution ring network is a distribution network consisting of multiple power lines connected end-to-end to form a closed loop structure. Power flow is controlled by equipment such as ring main units, circuit breakers, and load switches. It is an important network structure in modern power systems. Its core is the formation of a closed ring power supply trunk line through ring-arranged power lines and switching equipment, allowing power to be supplied to loads from two or more directions. This enables flexible power distribution, reliable supply, and efficient management, allowing for rapid switching of power paths during faults, reducing the scope and duration of power outages, and preventing large-scale blackouts caused by single-point faults. A compact ring main unit is a set of transmission and distribution electrical equipment, typically installed in a metal or non-metal insulated cabinet, or existing in the form of assembled, interval-type ring main power supply units. Its core function is to realize ring main power supply, improve power supply reliability, and facilitate the control, protection, isolation, and monitoring of the distribution network.

[0003] However, traditional ring main units have limited internal space. To reduce the footprint of the equipment, a modular design is usually adopted, integrating multiple functional units into one cabinet to form a compact ring main unit. This is used in areas with high load and limited space. Therefore, the functional modules installed in the compact ring main unit are relatively compact, especially in the depth direction of the cabinet, where the operating space is limited. Operators need to turn sideways or bend over to operate, which can easily lead to difficulties in installing large-capacity equipment (such as circuit breakers and combined electrical appliances). In addition, there is insufficient space for cable connection and adjustment, which can easily cause poor contact or failure. At the same time, the installation position between the functional modules in the traditional ring main unit is fixed, and it is impossible to dynamically adjust the number or type of modules according to load requirements. Summary of the Invention

[0004] The problem that this invention aims to solve is that the depth of traditional compact ring main units is limited, which can lead to difficulties in installing large-capacity equipment (such as circuit breakers and combined electrical appliances), and insufficient space for cable connection and adjustment can easily cause poor contact or failure. At the same time, the functional modules in traditional ring main units cannot be dynamically adjusted in terms of the number or type of modules according to load requirements.

[0005] To address the aforementioned technical problems, this invention provides a compact ring main unit for power distribution ring networks, comprising a cabinet, an mounting plate fixedly connected to the top of the cabinet's inner cavity, a support base fixedly connected to the bottom of the cabinet's inner cavity, an annular mounting bracket fixedly connected to one side of the cabinet's inner wall, mounting components for enabling the rotation and switching of functional modules mounted on the annular mounting bracket, a cable fixing component for preventing cable tangling provided in the middle of the cabinet's inner cavity, a first linear guide rail fixedly connected to the bottom of the mounting plate, and a second linear guide rail fixedly mounted to the top of the support base;

[0006] The mounting assembly includes a rotating carrier plate rotatably connected to the inner cavity of an annular mounting frame. The rotating carrier plate has two mounting slots, and a modular mounting frame is provided at the end of the rotating carrier plate away from the annular mounting frame.

[0007] The wire fixing assembly includes a support frame fixedly connected to the inner cavity of the cabinet. A sealing isolation cover is provided at the top of the support frame. A rotor coil is installed in the inner cavity of the sealing isolation cover. A plurality of conductive rings are fixedly connected to one end of the rotor coil, and a carbon brush is slidably connected to the surface of each conductive ring.

[0008] Preferably, a connecting block is fixedly connected to one end of the modular mounting bracket near the rotating carrier, and a limiting mounting block is fixedly connected to the other end of the modular mounting bracket away from the rotating carrier. The connecting block is adapted to the inner cavity shape of the mounting groove and is movably connected.

[0009] Preferably, the inner cavity of the mounting groove has two limiting holes, both ends of the connecting block are fixedly connected to limiting blocks, the middle of the limiting block has a positioning hole, the inner cavities of the limiting hole and the positioning hole are connected and communicate with each other, and a positioning bolt is provided through them.

[0010] Preferably, an equipment box is installed at one end of the cabinet, and a rotary motor is installed inside the equipment box. The output end of the rotary motor passes through the cabinet and the annular mounting frame and is fixedly connected to the axis of the rotating tray.

[0011] Preferably, the end of the sealing isolation cover away from the conductive ring is provided with a first connection end, and one end of the carbon brush is fixedly connected to a second connection end.

[0012] Preferably, a limiting frame is fixedly connected to the bottom end of the sealing isolation cover, and the limiting frame is fixedly connected to the top end of the support frame.

[0013] Preferably, a disconnecting switch is installed on the first linear guide rail, a voltage transformer is installed on the second linear guide rail, and a fuse is installed at the input terminal of the voltage transformer.

[0014] Preferably, a frame is fixedly installed on the other side of the inner wall of the cabinet, and a busbar system is installed on the frame. The fuse is located between the voltage transformer and the busbar system.

[0015] Preferably, a partition is fixedly connected to the lower part of the inner cavity of the cabinet, the voltage transformer is located at the bottom of the partition, a connecting groove is opened in the middle of the partition, the fuse passes through the connecting groove above and is connected to the input end of the busbar system.

[0016] The technical effects and advantages of this invention are as follows:

[0017] This invention utilizes a rotating carrier plate with a rotatable connection to enable the rotational operation of a modular mounting frame. When functional modules located deep within the cabinet cavity need to be installed or adjusted, a rotary motor drives the carrier plate to rotate, moving the functional units from the depths of the interior to the front of the cabinet. This reduces reliance on depth space and facilitates the adjustment or replacement of functional modules in different positions. Furthermore, a connecting block is fixed at the bottom of the modular mounting frame, enabling rapid installation and switching with the rotating carrier plate. This avoids the limited operating space within the compact ring main unit, which previously required workers to enter the cabinet sideways or bent over for installation or adjustment, thus reducing the risk of electric shock. It also prevents problems such as poor contact or malfunctions caused by insufficient adjustment space. Simultaneously, it allows for dynamic adjustment of the number or type of modules according to load requirements, enabling the switching of the positions of various functional modules after installation.

[0018] This invention transmits electrical energy from a stationary power source to a rotating component by incorporating a fixed-wire assembly. This avoids the breakage of traditional wires due to twisting during rotation, achieving a tangle-free connection. Traditional compact ring main units have limited space for cable connections or adjustments, easily leading to poor contact. Therefore, as the rotating disk rotates, the connecting wire drives the carbon brush to slide on the surface of the conductive ring, solving the electrical connection problem between the rotating disk and the stationary component. This allows for power supply or signal transmission during rotation, preventing the breakage of fixed-installation wires due to twisting during rotation in traditional ring main units. The tangle-free connection achieved through the conductive ring and carbon brush ensures long-term stable operation of the equipment and avoids poor contact or malfunctions caused by insufficient space for cable connections and adjustments in traditional compact ring main units.

[0019] This invention utilizes a first linear guide and a second linear guide to dynamically adjust the functional units according to load requirements. Based on the specific connection positions between the functional modules and the busbar, the first and second linear guides are driven to adjust the positions of the disconnecting switch and voltage transformer, ensuring the stability of the connection between the conductors and preventing damage to the conductors due to excessive bending angles or poor contact due to insufficient connection length. Simultaneously, a fuse is installed between the voltage transformer and the busbar, and a partition acts as a physical isolation barrier between the high-voltage busbar and the voltage transformer, reducing the risk of accidental contact with live parts. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the overall cross-sectional structure of the present invention.

[0022] Figure 3 This is a schematic diagram of the overall internal structure of the present invention.

[0023] Figure 4 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0024] Figure 5 This is a schematic diagram of the installation component structure of the present invention.

[0025] Figure 6 This is a schematic diagram of the wire fixing assembly structure of the present invention.

[0026] Figure 7 For the present invention Figure 2 Enlarged schematic diagram of the structure at point B.

[0027] The attached diagram is labeled as follows: 1. Cabinet; 2. Mounting plate; 3. Support base; 4. Annular mounting bracket; 5. Mounting assembly; 51. Rotating carrier; 52. Mounting slot; 53. Modular mounting bracket; 54. Connecting block; 55. Limiting mounting block; 56. Limiting hole; 57. Limiting block; 58. Positioning hole; 59. Positioning bolt; 510. Rotary motor; 6. Wiring assembly; 61. Bearing frame; 62. Sealing isolation cover; 63. Rotor coil; 64. Conductive ring; 65. Carbon brush; 66. First connecting end; 67. Second connecting end; 68. Limiting bracket; 7. First linear guide rail; 8. Second linear guide rail; 9. Equipment box; 10. Disconnecting switch; 11. Voltage transformer; 12. Fuse; 13. Frame; 14. Busbar system; 15. Partition plate; 16. Connecting slot. Detailed Implementation

[0028] This invention provides a compact ring main unit for power distribution ring networks, such as... Figure 1 - Figure 7As shown, the system includes a cabinet 1. A mounting plate 2 is fixedly connected to the top of the inner cavity of the cabinet 1, and a support base 3 is fixedly connected to the bottom of the inner cavity of the cabinet 1. A ring-shaped mounting bracket 4 is fixedly connected to one side of the inner wall of the cabinet 1. A mounting component 5 for rotating and switching functional modules is installed on the ring-shaped mounting bracket 4. A cable fixing component 6 for preventing cable tangling is provided in the middle of the inner cavity of the cabinet 1. A first linear guide rail 7 is fixedly connected to the bottom of the mounting plate 2, and a second linear guide rail 8 is fixedly installed at the top of the support base 3. The first linear guide rail 7 and the second linear guide rail 8 have the same structure, including a drive motor, a lead screw, a slider, and a track. The existing technology is relatively mature and will not be described in detail here. In use, the drive motor drives the lead screw to rotate, so that the slider moves linearly on the track.

[0029] Furthermore, such as Figure 1 , Figure 2 and Figure 4 As shown, the installation component 5 includes a rotating carrier plate 51 rotatably connected to the inner cavity of the annular mounting frame 4. The rotating carrier plate 51 has two mounting slots 52. A modular mounting frame 53 is provided at the end of the rotating carrier plate 51 away from the annular mounting frame 4. The various functional modules installed in the ring main unit are installed on the modular mounting frame 53 to form a modular structure that can be quickly switched or reassembled. The rotating carrier plate 51 rotatably connects to realize the rotation operation of the modular mounting frame 53, realizing the switching of the position of each functional module after installation, which facilitates the dynamic adjustment of the number or type of modules according to the load requirements.

[0030] Furthermore, such as Figure 1 , Figure 2 and Figure 6 As shown, the fixed wiring assembly 6 includes a support frame 61 fixedly connected to the inner cavity of the cabinet 1. A sealing isolation cover 62 is provided at the top of the support frame 61. A rotor coil 63 is installed in the inner cavity of the sealing isolation cover 62. Several conductive rings 64 are fixedly connected to one end of the rotor coil 63. A carbon brush 65 is slidably connected to the surface of each conductive ring 64. The sealing isolation cover 62 is made of insulating material to provide insulation to the surface of the rotor coil 63, thereby achieving electrical isolation of the rotor coil 63 in the inner cavity of the cabinet 1. Electrical energy is transmitted through the sliding contact of the carbon brush 65 on the surface of the conductive ring 64, transferring the electrical energy of the static power source to the rotating part. This avoids the breakage of traditional wires due to twisting during rotation, achieving a tangled connection and ensuring long-term stable operation.

[0031] Furthermore, such as Figure 4 and Figure 5As shown, a connecting block 54 is fixedly connected to one end of the modular mounting bracket 53 near the rotating carrier 51, and a limiting mounting block 55 is fixedly connected to the other end of the modular mounting bracket 53 away from the rotating carrier 51. The connecting block 54 is adapted to the inner cavity shape of the mounting groove 52 and is movably connected. The modular mounting bracket 53 achieves rapid positioning and installation through the movable connection between the connecting block 54 and the mounting groove 52. Each functional module is installed on the modular mounting bracket 53 using connectors, and the installation position is restricted by the limiting mounting block 55 to reduce the risk of functional modules falling off.

[0032] Furthermore, such as Figure 4 and Figure 5 As shown, the inner cavity of the mounting groove 52 has two limiting holes 56. Both ends of the connecting block 54 are fixedly connected to limiting blocks 57. The middle of the limiting block 57 has a positioning hole 58. The inner cavities of the limiting hole 56 and the positioning hole 58 are connected and connected, and a positioning bolt 59 is installed through them. After the modular mounting bracket 53 is installed on the rotating carrier plate 51 through the mounting groove 52 and the connecting block 54, its position is fixed by the positioning bolt 59 to prevent the connecting block 54 from sliding out of the mounting groove 52 during the rotation of the rotating carrier plate 51, which would cause the functional modules to tip over. This effectively improves the stability of the equipment. At the same time, the functional modules are installed on the side of the cabinet 1 through the modular mounting bracket 53, which effectively reduces the installation space of the functional modules and makes the installation position between the components more compact.

[0033] Furthermore, such as Figure 2 , Figure 3 and Figure 4 As shown, an equipment box 9 is installed at one end of the cabinet 1. A rotary motor 510 is installed inside the cavity of the equipment box 9. The output end of the rotary motor 510 passes through the cabinet 1 and the annular mounting frame 4 and is fixedly connected to the axis of the rotating carrier plate 51. Since the existing compact ring main unit has a relatively compact installation position between the internal components in order to reduce space, when it is necessary to install or adjust the functional module in the deep part of the cavity of the cabinet 1, the rotary motor 510 is started. The output end of the rotary motor 510 drives the rotating carrier plate 51 to rotate in the cavity of the annular mounting frame 4. By rotating the rotating carrier plate 51, the functional unit located in the deep part of the cavity is rotated to the front of the cabinet 1, reducing the dependence on the depth space and facilitating the adjustment or replacement of functional modules in different positions. This avoids the limited operating space inside the compact ring main unit, which would cause the staff to have to turn sideways or bend over to enter the cabinet 1 for installation or adjustment, reducing the risk of electric shock. At the same time, it avoids the problem of poor contact or failure caused by insufficient adjustment space.

[0034] Furthermore, such as Figure 2 and Figure 7As shown, the sealed isolation cover 62 has a first connection end 66 at the end away from the conductive ring 64, and a second connection end 67 is fixedly connected to one end of the carbon brush 65. First, the wires that need to be connected to the functional module are welded to the first connection end 66, and the wires connected in the busbar system 14 are connected to the second connection end 67. The connection between the functional module and the current or signal is realized through the intermediate rotor coil 63. When the functional module needs to be switched or reassembled after the connection is completed, the rotating carrier 51 is driven to rotate. While the rotating carrier 51 is rotating, the carbon brush 65 is driven to slide on the surface of the conductive ring 64 through the connecting wire. This solves the electrical connection problem between the rotating carrier 51 and the stationary parts, and enables power supply or signal transmission during rotation. It avoids the wires fixedly installed in traditional ring main units from breaking due to twisting during rotation. The non-tangled connection is achieved through the conductive ring 64 and the carbon brush 65, ensuring long-term stable operation of the equipment. It can also avoid poor contact or failure caused by insufficient cable connection and adjustment space in traditional compact ring main units.

[0035] Furthermore, such as Figure 6 and Figure 7 As shown, the bottom end of the sealing isolation cover 62 is fixedly connected to the limiting frame 68, which is fixedly connected to the top end of the bearing frame 61. Since the sealing isolation cover 62 is cylindrical, the limiting frame 68 increases the stability of the sealing isolation cover 62 during installation, and avoids positional deviation during the adjustment of the functional module, which could lead to poor contact between the wires.

[0036] Furthermore, such as Figure 1 and Figure 3 As shown, a disconnector switch 10 is installed on the first linear guide rail 7, and a voltage transformer 11 is installed on the second linear guide rail 8. A fuse 12 is installed at the input end of the voltage transformer 11. The positions of the disconnector switch 10 and the voltage transformer 11 are adjusted according to the specific connection positions between the functional module and the busbar to ensure the stability of the connection between the conductors and avoid damage to the conductors due to excessive bending angles or poor contact due to insufficient connection length. When adjusting the position, the drive motors in the first linear guide rail 7 and the second linear guide rail 8 are started to realize the linear movement of the disconnector switch 10 and the voltage transformer 11 to adjust the position.

[0037] Furthermore, such as Figure 1 and Figure 2As shown, a frame 13 is fixedly installed on the other side of the inner wall of the cabinet 1. A busbar system 14 is installed on the frame 13. The fuse 12 is located between the voltage transformer 11 and the busbar system 14. The busbar system 14 consists of multiple busbars. Each functional module is electrically connected through the busbars. The additional fixed-line component 6 in the middle fixes and transfers one of the connection sections to ensure that the functional module can maintain electrical connection with the busbar system 14 during rotation. The functional modules, disconnecting switch 10, busbar system 14 and other components inside the cabinet are all installed on the side inside the cabinet 1 through corresponding connection structures, effectively reducing the space occupied and achieving a compact installation position between the modules in the ring main unit.

[0038] Furthermore, such as Figure 2 and Figure 3 As shown, a partition 15 is fixedly connected to the lower part of the inner cavity of the cabinet 1. The voltage transformer 11 is located at the bottom of the partition 15. A connecting groove 16 is opened in the middle of the partition 15. The fuse 12 passes through the connecting groove 16 above and is connected to the input end of the busbar system 14. The fuse 12 is used as a key protection device for the primary side of the voltage transformer 11. In the ring main unit, the installation of the fuse 12 between the voltage transformer 11 and the busbar can ensure that the power supply is quickly cut off when the voltage transformer 11 fails, preventing the fault from spreading to the busbar or other equipment. It can also cut off the current during a fault to prevent equipment damage. At the same time, the partition 15 serves as a physical isolation barrier between the high-voltage busbar and the voltage transformer 11, which can reduce the risk of accidental contact with live parts.

[0039] The working principle of this invention is as follows: First, the required functional modules in the ring main unit are installed on the modular mounting frame 53 via connectors. Based on the specific connection positions between the functional modules and the busbar, the positions of the disconnecting switch 10 and voltage transformer 11 are adjusted to ensure the stability of the connection between the conductors, preventing damage to the conductors due to excessive bending angles or poor contact due to insufficient connection length. During position adjustment, the drive motors in the first linear guide rail 7 and the second linear guide rail 8 are activated to achieve linear movement of the disconnecting switch 10 and voltage transformer 11 for position adjustment. The installation position of the functional modules is limited by the limiting mounting block 55 to reduce the risk of functional modules falling off. Then, the modular mounting frame 53 is connected to the inner cavity of the mounting groove 52 via the bottom connecting block 54. The connection enables rapid positioning and installation. A positioning bolt 59 is then used to secure the module through the limiting hole 56 and positioning hole 58, preventing the connecting block 54 from sliding out of the mounting groove 52 during the rotation of the rotating carrier plate 51, which could cause the functional modules to tip over. This effectively improves the stability of the equipment. The installed functional modules are electrically connected via the busbars in the busbar system 14. A portion of the wire connection is fixed and transferred using the wire fixing assembly 6. The wires that need to be connected to the functional modules are welded to the first connection end 66, while the wires connected in the busbar system 14 are connected to the second connection end 67. The functional modules are connected to current or signals through the intermediate rotor coil 63. Simultaneously, to prevent equipment failure within the cabinet 1 from spreading to the busbars or other components... The equipment includes a fuse 12 installed between the voltage transformer 11 and the busbar to ensure rapid power cut-off in case of equipment failure. A partition 15 also serves as a physical isolation barrier between the high-voltage busbar and the voltage transformer 11, reducing the risk of accidental contact with live parts. Because existing compact ring main units prioritize space reduction, the installation positions of components are relatively tight. Therefore, when it is necessary to install or adjust functional modules located deep within the cabinet 1, the rotary motor 510 is started. The output of the rotary motor 510 drives the rotating carrier 51 to rotate within the annular mounting bracket 4. The rotation of the carrier 51 moves the functional units located deep within the cabinet 1 to the front, reducing reliance on depth and facilitating adjustments to functional modules in different positions. Replacement avoids the limited operating space inside the compact ring main unit, which would otherwise require workers to squeeze sideways or bend over to enter the cabinet 1 for installation or adjustment, reducing the risk of electric shock. It also avoids problems such as poor contact or malfunctions caused by insufficient adjustment space. As the rotating carrier 51 rotates, the carbon brush 65 slides on the surface of the conductive ring 64 through the connecting wire, solving the electrical connection problem between the rotating carrier 51 and the stationary parts. This allows for power supply or signal transmission during rotation, avoiding the breakage of the fixed wires in traditional ring main units due to twisting during rotation. The conductive ring 64 and carbon brush 65 achieve a non-tangled connection, ensuring long-term stable operation of the equipment. It also avoids the poor contact or malfunctions caused by insufficient cable connection and adjustment space in traditional compact ring main units.

[0040] It is understood that the present invention has been described through some embodiments, which are known to those skilled in the art. Various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A compact ring main unit for power distribution ring networks, comprising a cabinet, wherein a mounting plate is fixedly connected to the top of the inner cavity of the cabinet, and a support base is fixedly connected to the bottom of the inner cavity of the cabinet, characterized in that: A ring-shaped mounting bracket is fixedly connected to one side of the inner wall of the cabinet. The ring-shaped mounting bracket is equipped with mounting components for rotating and switching functional modules. A cable fixing component is provided in the middle of the inner cavity of the cabinet to prevent cables from getting tangled. A first linear guide rail is fixedly connected to the bottom of the mounting plate, and a second linear guide rail is fixedly installed at the top of the support base. The mounting assembly includes a rotating carrier plate rotatably connected to the inner cavity of an annular mounting frame. The rotating carrier plate has two mounting slots, and a modular mounting frame is provided at the end of the rotating carrier plate away from the annular mounting frame. The wire fixing assembly includes a support frame fixedly connected to the inner cavity of the cabinet. A sealing isolation cover is provided at the top of the support frame. A rotor coil is installed in the inner cavity of the sealing isolation cover. A plurality of conductive rings are fixedly connected to one end of the rotor coil. A carbon brush is slidably connected to the surface of each conductive ring. Two connecting blocks are fixedly connected to one end of the modular mounting frame near the rotating carrier, and a limiting mounting block is fixedly connected to the other end of the modular mounting frame away from the rotating carrier. The connecting blocks are adapted to the inner cavity shape of the mounting groove and are movably connected. Each functional module is mounted on the modular mounting frame using connectors. The inner cavity of the mounting groove is provided with four limiting holes. Both ends of the connecting block are fixedly connected to limiting blocks. The middle part of the limiting block is provided with a positioning hole. The inner cavities of the limiting hole and the positioning hole are connected and communicate with each other, and a positioning bolt is provided through them. The sealed isolation cover has a first connection end at the end away from the conductive ring, and a second connection end is fixedly connected to one end of the carbon brush. First, the wires that need to be connected to the functional module are soldered to the first connection end, and the wires connected in the busbar system are connected to the second connection end. The connection between the functional module and the current or signal is realized through the intermediate rotor coil. The bottom end of the sealed isolation cover is fixedly connected to a limiting frame, which is fixedly connected to the top end of the support frame.

2. A compact ring main unit for power distribution ring networks according to claim 1, characterized in that: An equipment box is installed at one end of the cabinet. A rotary motor is installed inside the equipment box. The output end of the rotary motor passes through the cabinet and the annular mounting frame and is fixedly connected to the axis of the rotating tray.

3. A compact ring main unit for power distribution ring networks according to claim 1, characterized in that: A disconnecting switch is installed on the first linear guide rail, and a voltage transformer is installed on the second linear guide rail. A fuse is installed at the input terminal of the voltage transformer.

4. A compact ring main unit for power distribution ring networks according to claim 3, characterized in that: A frame is fixedly installed on the other side of the inner wall of the cabinet, and a busbar system is installed on the frame. The fuse is located between the voltage transformer and the busbar system.

5. A compact ring main unit for power distribution ring networks according to claim 4, characterized in that: A partition is fixedly connected to the lower part of the inner cavity of the cabinet. The voltage transformer is located at the bottom of the partition. A connecting groove is opened in the middle of the partition. The fuse passes through the connecting groove and is connected to the input end of the busbar system.

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