A high-voltage ring main unit with internal protection device

Abstract

This invention relates to the field of high-voltage ring main units, specifically a high-voltage ring main unit with an internal protection device. The internal component includes an internal assembly section. The mounting slots for electrical components are formed using precision CNC machining technology for power electronic components. The internal assembly section has three sets of outward-extending sections and two sets of mounting sections. Each of the two mounting sections has two opposing break sections. Each of the two mounting sections also has an internal adjustment section. By extending the telescopic rod of a control cylinder, the locking block moves upward, causing the plug to disengage from the through hole of the locking side block, releasing the lock. This allows the displacement top block to move under the action of a spring, pushing the blocking plate through an inclined surface. The blocking plate is then inserted between guide push blocks, separating the two contacting guide push blocks and thus cutting off the conductive connection between the electrical components in the two separate cavities.

Description

Technical Field

[0001] This invention relates to the field of high-voltage ring main units, specifically a high-voltage ring main unit with an internal protection device. Background Technology

[0002] In the power distribution network, high-voltage ring main units (RNBs) are key electrical devices that enable power distribution, control, and protection. They are widely used in densely populated areas with concentrated electricity demand, such as urban residential communities, industrial parks, commercial centers, and transportation hubs. Their core function is to connect high-voltage cable lines to achieve ring network or radial power supply, ensuring the stable operation and reliable power supply of the distribution network system. They are one of the important infrastructures for maintaining the normal order of modern social production and life. With the rapid development of the social economy and the continuous growth of electricity load, higher requirements are placed on the operational reliability, safety, and intelligence level of high-voltage RNBs. This requirement is not only reflected in the optimization of the overall structure of the RNB, but also depends on the performance upgrade of its internal core protection devices. The advancement of power electronic component manufacturing technology is the key foundation for supporting this upgrade. However, in the existing technology, the protection mechanism of traditional high-voltage RNBs has obvious shortcomings. Most products rely solely on external protection systems for fault protection, lacking independent and efficient autonomous protection devices internally. To increase the safety of high-voltage RNBs during use, a high-voltage RNB with internal protection devices is needed.

[0003] Currently, from a safety perspective, traditional high-voltage ring main units are prone to failure due to various factors. During long-term operation, the contacts of the switchgear inside the cabinet are prone to wear and oxidation, leading to increased contact resistance and subsequent localized overheating. Since most of the electrical components inside the cabinet are directly connected by wiring, a failure in a single electrical component can easily affect the entire wiring inside the cabinet, making subsequent maintenance difficult. At the same time, traditional high-voltage ring main units mainly rely on ventilation holes for heat dissipation, but due to the small openings of the ventilation holes, they cannot meet the heat dissipation requirements when the internal temperature is too high, resulting in excessively high internal temperatures that affect the normal operation of electrical components. Summary of the Invention

[0004] The purpose of this invention is to provide a high-voltage ring main unit with an internal protection device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-voltage ring main unit with an internal protection device, comprising an internal assembly, wherein the internal assembly includes an installation cabinet, the installation cabinet having three sub-cavities, and two connecting through holes connecting the three sub-cavities; the internal assembly has three sets of outward extensions, and two sets of installation portions, each of the two sets of installation portions having two sets of opposing break portions, each of the two sets of break portions including an inner insert block, the inner insert block having a shrinkage groove, the shrinkage groove having a guide push block slidably connected inside; and each of the two sets of installation portions having an internal adjustment portion, the internal adjustment portion including a control cylinder, the control cylinder having two displacement top blocks on its outer side, and the control cylinder having two opposing blocking plates on its outer side.

[0006] Preferably, each of the three dispensing cavities has two side-mounting through holes on its side, and each of the three dispensing cavities has two opposing outward through holes on its side. The front of the mounting cabinet is rotatably connected to three cabinet doors.

[0007] Preferably, the three sets of outward extension parts are respectively arranged inside the corresponding dispensing cavities. Each outward extension part includes an inner solid plate, which is fixed to the inner wall of the corresponding dispensing cavity. The inner solid plate has two mounting slots, and an outward extension cylinder is fixedly connected to each of the two mounting slots. The telescopic rods of the two outward extension cylinders are movably inserted into the corresponding outward extension through holes, and a connecting block is fixedly connected to the end of each telescopic rod of the two outward extension cylinders.

[0008] Preferably, both sides of the inner fixed plate are provided with heat dissipation side plates, and the two heat dissipation side plates are rotatably connected to the corresponding side mounting through holes. Outer fixed plates are fixed to the outer sides of both heat dissipation side plates, and sliding grooves are formed inside the two outer fixed plates.

[0009] Both outer fixed plates are slidably connected to the sliding grooves of the two outer fixed plates, and the ends of the two outer fixed plates are rotatably connected to the corresponding connecting blocks. A monitoring block is fixedly attached to the inner fixed plate.

[0010] Preferably, both sets of mounting parts include a partition block, which is fixedly inserted into the corresponding connecting through hole. The partition block has two fixing slots inside and two opposing telescopic grooves inside, both of which are connected to the corresponding fixing slots. The partition block also has two opposing pushing grooves inside, both of which are connected to the corresponding telescopic grooves. The bottom of the partition block has a bottom mounting groove connected to a shaft hole.

[0011] Preferably, the inner insert block is fixedly inserted into the corresponding fixed slot. The inner insert block has a split groove inside, which is aligned with the corresponding telescopic groove. The contraction groove is connected to the split groove through a rectangular through hole. The inner insert block has a wiring groove, which is connected to the contraction groove through a rectangular through hole. A conductive plate is fixedly inserted inside the wiring groove and the contraction groove. The conductive plate has a threaded through hole, and a spring is fixedly connected to the conductive plate.

[0012] Preferably, the guide push block is movably inserted into the rectangular through hole of the shrinkage groove and the split groove. The guide push block is provided with an inclined surface. The guide push block is fixedly connected to a telescopic guide rod. A threaded rod is fixedly connected to the end of the telescopic guide rod. The threaded rod of the telescopic guide rod is threadedly connected to the threaded through hole of the corresponding conductive plate.

[0013] Preferably, the control cylinder is fixedly connected in the corresponding bottom mounting groove, the telescopic rod of the control cylinder is movably inserted into the shaft hole of the bottom mounting groove, a locking block is fixedly connected to the end of the telescopic rod of the control cylinder, a plug is fixedly connected to the bottom of the locking block, the two displacement top blocks are slidably connected in the corresponding push groove, springs are provided on the two displacement top blocks, inclined surfaces are provided on the two displacement top blocks, and a hand control block is fixedly connected to the top of each of the two displacement top blocks.

[0014] Preferably, each of the two hand-operated blocks has a locking side block fixedly connected to its side. The locking side block has a circular through hole that matches the insert block on the locking block. Both blocking plates are slidably connected in the corresponding telescopic grooves. Both blocking plates are slidably connected in the corresponding split grooves. Both blocking plates are provided with springs and inclined surfaces. Both blocking plates are in contact with the corresponding displacement top block through the inclined surfaces.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The cabinet is divided into three independent compartments, which are connected in an orderly manner through connecting holes. This compartmentalized design allows for the separate installation of electrical components with different functions, avoiding mutual interference between components. When the extension cylinder is activated, the telescopic rod pushes the connecting block to extend the extension frame, thereby controlling the rotation of the heat dissipation side plate around the side mounting hole. The heat dissipation angle can be adjusted according to the internal temperature of the compartment, improving heat dissipation efficiency. This effectively avoids the problem that traditional high-voltage ring main units mainly rely on heat dissipation holes for heat dissipation, but due to the small opening of the heat dissipation holes, the heat dissipation holes cannot meet the heat dissipation requirements when the internal temperature is too high, resulting in excessively high internal temperature and affecting the normal use of electrical components.

[0017] Two blocking plates are respectively embedded into the telescopic grooves of the separator block, and the blocking plates can extend into the breaking groove of the inner block. A spring is provided on the outer side of the blocking plate to push the blocking plate part into the breaking groove. The surface of the blocking plate is machined with an inclined surface, which makes close contact with the inclined surface of the displacement top block, forming a linkage structure. As the core actuator for circuit breaking, the blocking plate's structural precision and wear resistance directly determine the reliability of the breaking action. It requires precision stamping and surface treatment technology in the field of power electronic component manufacturing to ensure its full cooperation with the telescopic groove. When it is necessary to cut off the circuit in the breaking groove or... When the circuit is open, the control cylinder extension rod extends outward, causing the locking block to move upward. The plug disengages from the through hole of the locking side block, releasing the lock. The displacement top block moves under the action of the spring, pushing the blocking plate through the inclined surface. The blocking plate is then inserted between the guide push blocks, separating the two contacting guide push blocks. This cuts off the conductive connection of the electrical components in the two sub-assembly cavities, effectively avoiding the problem that a single electrical component failure can easily affect the overall wiring in the cabinet, making subsequent maintenance difficult, since most electrical components in the cabinet are directly connected through wiring. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the three-dimensional assembly structure of the present invention;

[0019] Figure 2 This is an exploded structural diagram of the present invention;

[0020] Figure 3 This is an exploded bottom view schematic diagram of the structure of the present invention;

[0021] Figure 4 This is a partial cross-sectional view of the present invention;

[0022] Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure of part A is shown.

[0023] Figure 6 This is a schematic diagram of the internal assembly structure of the present invention;

[0024] Figure 7 This is a schematic diagram of the assembly structure of the extended part of the present invention;

[0025] Figure 8 This is a schematic diagram of the mounting structure of the present invention;

[0026] Figure 9 This is a schematic diagram of the assembly structure of the segmented part of the present invention;

[0027] Figure 10 For the present invention Figure 9 A schematic diagram of the enlarged structure of section B is shown.

[0028] Figure 11 This is a schematic diagram of the assembly structure of the internal adjustment part of the present invention;

[0029] Figure 12 This is a schematic diagram of the assembly structure of the mounting part, the split part, and the internal adjustment part of the present invention.

[0030] Figure 13 For the present invention Figure 12 A schematic diagram of the enlarged structure of section C is shown.

[0031] Figure 14 This is a schematic diagram of the structure of the present invention with a partial cross-section of the mounting part.

[0032] The attached diagram lists the components represented by each number as follows:

[0033] 1. Internal assembly; 101. Mounting cabinet; 102. Sub-assembly cavity; 103. Side mounting through hole; 104. External extension through hole; 105. Connection through hole; 106. Cabinet door; 2. External extension assembly; 201. Inner fixed plate; 202. Mounting groove; 203. External extension cylinder; 204. Connecting block; 205. Heat dissipation side plate; 206. Outer fixed plate; 207. External extension frame; 208. Monitoring block; 3. Mounting assembly; 301. Divider block; 302. Fixed insertion. 303. Expansion slot; 304. Pushing slot; 305. Bottom mounting slot; 4. Break section; 401. Inner insert block; 402. Break section; 403. Retraction slot; 404. Wiring slot; 405. Conductive plate; 406. Guide push block; 407. Telescopic guide rod; 5. Internal adjustment section; 501. Control cylinder; 502. Locking block; 503. Displacement top block; 504. Manual control block; 505. Locking side block; 506. Blocking insert plate. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1: Please refer to Figure 1 - Figure 14A high-voltage ring main unit with an internal protection device includes an internal assembly 1, which includes an installation cabinet 101. The installation cabinet 101 has three sub-assembly cavities 102 inside, and two connecting through holes 105 connecting the three sub-assembly cavities 102. The internal assembly 1 has three sets of outward extensions 2 inside, and two sets of mounting parts 3 inside. Each of the two sets of mounting parts 3 has two sets of opposing break sections 4 inside. Each of the two sets of break sections 4 includes an inner insertion block 401. The inner insertion block 401 has a shrinkage groove 403 inside, and a guide push block 406 is slidably connected inside the shrinkage groove 403. Each of the two sets of mounting parts 3 has an internal adjustment part 5 inside, which includes a control cylinder 501. The control cylinder 501 has two displacement top blocks 503 on its outer side, and two opposing blocking plates 506 on its outer side.

[0036] Each of the three sub-packing cavities 102 has two side-mounting through holes 103 connected to its side, and each of the three sub-packing cavities 102 has two opposing outward through holes 104 connected to its side. The front of the mounting cabinet 101 is rotatably connected to three cabinet doors 106.

[0037] Three sets of outward extension sections 2 are respectively installed inside the corresponding sub-packaging cavities 102. Each outward extension section 2 includes an inner fixed plate 201, which is fixed to the inner wall of the corresponding sub-packaging cavity 102. Two mounting slots 202 are opened on the inner fixed plate 201. An outward extension cylinder 203 is fixedly connected to each of the two mounting slots 202. The telescopic rods of the two outward extension cylinders 203 are movably inserted into the corresponding outward extension through holes 104. A connecting block 204 is fixedly connected to the end of the telescopic rod of the two outward extension cylinders 203.

[0038] The inner plate 201 has heat dissipation side plates 205 on both sides. The two heat dissipation side plates 205 are rotatably connected to the corresponding side mounting through holes 103. The outer side of the two heat dissipation side plates 205 is fixedly connected to the outer side of the two heat dissipation side plates 206. The inner side of the two outer plate 206 is provided with sliding grooves. The two outer plate 206 are slidably connected to the sliding grooves. The ends of the two outer plates 207 are rotatably connected to the corresponding connecting blocks 204. The inner plate 201 is fixedly connected to the monitoring block 208.

[0039] In this embodiment, heat dissipation side plates 205 are rotatably connected to the side mounting through holes 103 on both sides of the dispensing cavity 102. An outer fixing plate 206 is welded to the outside of each heat dissipation side plate 205. A sliding groove is machined inside the outer fixing plate 206, and an extension frame 207 is embedded into the sliding groove to achieve a sliding connection. Then, the end of the extension frame 207 away from the outer fixing plate 206 is rotatably connected to the connecting block 204 via a pin, forming a linkage structure of "extension cylinder 203 - connecting block 204 - extension frame 207 - heat dissipation side plate 205". Simultaneously, a monitoring block 208 is fixed at a designated position on the surface of the inner fixing plate 201. The monitoring block 208 can integrate temperature, humidity, or pressure sensors to monitor the internal environment of the dispensing cavity 102 in real time. The data can be transmitted to an external control system via wires to realize the device's operating status. The monitoring system automatically activates the extension cylinder 203 when the monitoring block 208 detects that the internal temperature of the dispensing cavity 102 exceeds the preset threshold. The extension rod extends outward and pushes the connecting block 204 to move. The connecting block 204 drives the extension frame 207 to extend along the sliding groove of the outer fixed plate 206. At the same time, the extension frame 207 pushes the heat dissipation side plate 205 to rotate around the side mounting through hole 103 through the rotational force, realizing the adjustment of the heat dissipation angle and the expansion of the external support structure. By increasing the opening area, the internal heat is dissipated more quickly, thereby reducing the temperature inside the cabinet. This effectively avoids the problem that traditional high-voltage ring main cabinets mainly rely on heat dissipation holes for heat dissipation, but because the opening of the heat dissipation holes is small, the heat dissipation holes cannot meet the heat dissipation requirements when the internal temperature is too high, resulting in the cabinet temperature being too high and affecting the normal use of electrical components.

[0040] Example 2: Please refer to Figures 1-14 Both sets of mounting parts 3 include a partition block 301, which is fixedly inserted into the corresponding connecting through hole 105. The partition block 301 has two fixing slots 302 inside and two opposing telescopic grooves 303 inside. Both telescopic grooves 303 are connected to the corresponding fixing slots 302. The partition block 301 has two opposing pushing grooves 304 inside and both pushing grooves 304 are connected to the corresponding telescopic grooves 303. The bottom of the partition block 301 has a bottom mounting groove 305, which is connected to a shaft hole.

[0041] The inner insert 401 is fixedly inserted into the corresponding slot 302. The inner insert 401 has a split groove 402 inside, which is aligned with the corresponding telescopic groove 303. The contraction groove 403 is connected to the split groove 402 through a rectangular through hole. The inner insert 401 has a wiring groove 404, which is connected to the contraction groove 403 through a rectangular through hole. A conductive plate 405 is fixedly inserted inside the wiring groove 404 and the contraction groove 403. The conductive plate 405 has a threaded through hole and a spring is fixedly connected to the conductive plate 405.

[0042] The guide push block 406 is movably inserted into the rectangular through hole of the shrinkage groove 403 and the split groove 402. The guide push block 406 is provided with an inclined surface. The guide push block 406 is fixedly connected to the telescopic guide rod 407. The end of the telescopic guide rod 407 is fixedly connected to a threaded rod. The threaded rod of the telescopic guide rod 407 is threadedly connected to the threaded through hole of the corresponding conductive plate 405.

[0043] The control cylinder 501 is fixedly connected in the corresponding bottom mounting groove 305. The telescopic rod of the control cylinder 501 is movably inserted into the shaft hole of the bottom mounting groove 305. The end of the telescopic rod of the control cylinder 501 is fixedly connected to a locking block 502. The bottom of the locking block 502 is fixedly connected to a plug. Two displacement top blocks 503 are slidably connected in the corresponding push groove 304. Springs are provided on the two displacement top blocks 503. Inclined surfaces are provided on the two displacement top blocks 503. A hand control block 504 is fixedly connected to the top of each of the two displacement top blocks 503.

[0044] Both hand control blocks 504 have locking side blocks 505 fixedly connected to their sides. The locking side blocks 505 have circular through holes that cooperate with the inserts on the locking blocks 502. Both blocking plates 506 are slidably connected in the corresponding telescopic grooves 303 and the corresponding split grooves 402. Both blocking plates 506 are provided with springs and inclined surfaces. Both blocking plates 506 are in contact with the corresponding displacement top blocks 503 through the inclined surfaces.

[0045] In this embodiment, the separator 301 is fastened to the connecting through hole 105 with bolts. A conductive plate 405 is fixedly inserted into the wiring groove 404 and the shrinkage groove 403. The wiring groove 404 is used for external wire connection, and the wire and the conductive plate 405 establish a circuit connection. The guide push block 406 is embedded in the rectangular through hole of the shrinkage groove 403 and the breaking groove 402, ensuring it can slide along the through hole. The surface of the guide push block 406 is machined with a bevel to cooperate with the bevel of the blocking plate 506 to achieve force transmission. The blocking plates 506 are respectively embedded in the telescopic grooves 303 of the separator 301, and the blocking plates 506 can extend into the breaking grooves 402 of the inner block 401. A spring is provided on the outer side of the blocking plates 506 to push the blocking plates 506 partially into the breaking grooves 402. The surface of the blocking plates 506 is machined with a bevel, which is in close contact with the bevel of the displacement top block 503 to form a linkage structure. As the core actuator for realizing circuit breaking, the structural precision and wear resistance of the blocking plates 506 directly determine the reliability of the breaking action. The system relies on precision stamping and surface treatment technology in the field of power electronic component manufacturing to ensure full cooperation with the telescopic groove 303. When it is necessary to cut off the circuit or channel in the split groove 402, the telescopic rod of the control cylinder 501 extends outward, driving the locking block 502 to move upward. The plug is dislodged from the through hole of the locking side block 505, releasing the lock. The displacement top block 503 moves under the action of the spring to push the blocking plate 506 through the inclined surface, and the blocking plate 506 is inserted between the guide push blocks 406. At this time, the insertion of the blocking plate 506 forces the guide push block 406 to move, and under the action of the telescopic guide rod 407, it forces the inserted part of the conductive plate 405 to bend, thereby separating the two contacting guide push blocks 406, thus cutting off the conductive connection of the electrical components in the two sub-cavities 102. This effectively avoids the problem that the electrical components in the cabinet are mostly directly connected through the wiring, which can easily affect the overall wiring in the cabinet when a single electrical component fails, making subsequent maintenance more difficult.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-voltage ring main unit with an internal protection device, comprising an internal assembly (1), characterized in that: The interior part (1) includes a mounting cabinet (101), which has three sub-cavities (102) inside. Two connecting through holes (105) connect the three sub-cavities (102). The interior part (1) has three sets of outward-extending parts (2) inside. The interior part (1) also has two sets of mounting parts (3) inside. Both sets of mounting parts (3) include a partition block (301). The partition block (301) has two opposing telescopic grooves (303) inside. The mounting part (3) is provided with two sets of opposing split parts (4) inside. Each set of split parts (4) includes an insert block (401). The insert block (401) has a split groove (402) inside. The split groove (402) is aligned with the corresponding telescopic groove (303). The insert block (401) has a contraction groove (403) inside. A guide push block (406) is slidably connected inside the contraction groove (403). The guide push block (406) has an inclined surface. The installation part (3) is provided with an internal adjustment part (5). The internal adjustment part (5) includes a control cylinder (501). A locking block (502) is fixedly connected to the end of the telescopic rod of the control cylinder (501). A plug is fixedly connected to the bottom of the locking block (502). Two displacement top blocks (503) are provided on the outside of the control cylinder (501). The two displacement top blocks (503) are provided with inclined surfaces. A hand control block (504) is fixedly connected to the top of each of the two displacement top blocks (503). The sides of the control cylinder (501) are fixed with locking side blocks (505). Two opposing blocking plates (506) are provided on the outside of the control cylinder (501). Both blocking plates (506) are provided with inclined surfaces. Both blocking plates (506) are in contact with the corresponding displacement top block (503) through the inclined surfaces. Both blocking plates (506) are slidably connected in the corresponding telescopic groove (303). Both blocking plates (506) are slidably connected in the corresponding split groove (402).

2. A high-voltage ring main unit with an internal protection device according to claim 1, characterized in that: Each of the three dispensing cavities (102) has two side-mounted through holes (103) on its side, and each of the three dispensing cavities (102) has two opposite outward through holes (104) on its side. The front of the mounting cabinet (101) is rotatably connected to three cabinet doors (106).

3. A high-voltage ring main unit with an internal protection device according to claim 2, characterized in that: The three sets of extended sections (2) are respectively arranged inside the corresponding dispensing cavities (102). Each extended section (2) includes an inner fixed plate (201). The inner fixed plate (201) is fixed to the inner wall of the corresponding dispensing cavity (102). Two mounting slots (202) are opened on the inner fixed plate (201). An extended cylinder (203) is fixedly connected in each of the two mounting slots (202). The telescopic rods of the two extended cylinders (203) are movably inserted into the corresponding extended through holes (104). A connecting block (204) is fixedly connected to the end of the telescopic rod of the two extended cylinders (203).

4. A high-voltage ring main unit with an internal protection device according to claim 3, characterized in that: The inner plate (201) is provided with heat dissipation side plates (205) on both sides. The two heat dissipation side plates (205) are rotatably connected in the corresponding side mounting through holes (103). The outer sides of the two heat dissipation side plates (205) are fixedly connected with outer plates (206). The interior of the two outer plates (206) is provided with sliding grooves. The sliding grooves of the two outer plates (206) are slidably connected with extension brackets (207). The ends of the two extension brackets (207) are rotatably connected to the corresponding connecting blocks (204). The inner plate (201) is fixedly connected with a monitoring block (208).

5. A high-voltage ring main unit with an internal protection device according to claim 1, characterized in that: The partition block (301) is fixedly inserted into the corresponding connecting through hole (105). The partition block (301) has two fixed slots (302) inside. The two telescopic grooves (303) are connected to the corresponding fixed slots (302). The partition block (301) has two opposing push grooves (304) inside. The two push grooves (304) are connected to the corresponding telescopic grooves (303). The bottom of the partition block (301) has a bottom mounting groove (305) connected to a shaft hole.

6. A high-voltage ring main unit with an internal protection device according to claim 5, characterized in that: The inner insert (401) is fixedly inserted into the corresponding fixed slot (302). The shrinkage groove (403) and the split groove (402) are connected through a rectangular through hole. A wiring groove (404) is provided on the inner insert (401). The wiring groove (404) and the shrinkage groove (403) are connected through a rectangular through hole. A conductive plate (405) is fixedly inserted inside the wiring groove (404) and the shrinkage groove (403). A threaded through hole is provided on the conductive plate (405). A spring is fixedly connected to the conductive plate (405).

7. A high-voltage ring main unit with an internal protection device according to claim 6, characterized in that: The guide push block (406) is movably inserted into the rectangular through hole of the shrinkage groove (403) and the split groove (402). The guide push block (406) is fixedly connected to a telescopic guide rod (407). A threaded rod is fixedly connected to the end of the telescopic guide rod (407). The threaded rod of the telescopic guide rod (407) is threadedly connected to the threaded through hole of the corresponding conductive plate (405).

8. A high-voltage ring main unit with an internal protection device according to claim 5, characterized in that: The control cylinder (501) is fixed in the corresponding bottom mounting groove (305), the telescopic rod of the control cylinder (501) is movably inserted into the shaft hole of the bottom mounting groove (305), the two displacement top blocks (503) are slidably connected in the corresponding push groove (304), and springs are provided on the two displacement top blocks (503).

9. A high-voltage ring main unit with an internal protection device according to claim 1, characterized in that: The locking side block (505) has a circular through hole that matches the insert block on the locking block (502), and both blocking insert plates (506) are provided with springs.

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