Five-prevention mechanical interlocking structure and ring main unit

Abstract

The invention provides a five-prevention mechanical interlocking structure and a ring main unit. The five-prevention mechanical interlocking structure comprises a three-station interlocking plate, a circuit breaker interlocking plate, a cable chamber door interlocking plate and a three-station indication plate, the plane where the length and the width of the three-station interlocking plate are located is perpendicular to the horizontal plane, the circuit breaker interlocking plate is arranged on one side of the three-station interlocking plate in the thickness direction, the cable chamber door interlocking plate is arranged on one side of the three-station interlocking plate in the thickness direction, and the three-station indication plate is arranged on one side of the three-station interlocking plate in the thickness direction. The three-station interlocking plate, the circuit breaker interlocking plate and the cable chamber door interlocking plate can move up and down, and the three-station indication plate can rotate in a vertical plane. According to the invention, the three stations, the circuit breaker, the cable chamber door interlocking plate and the indication board are integrated, and the matching form of vertical arrangement, up-and-down movement and vertical rotation is adopted, so that the types of parts and the assembly process are simplified.

Description

Technical Field

[0001] This invention relates to the field of switchgear, specifically to a five-proof mechanical interlocking structure and a ring main unit. Background Technology

[0002] The five-prevention system is the core protective equipment in substations to prevent electrical misoperation, and it is crucial for ensuring the safe and stable operation of substations and mitigating the risks of human error. During routine switching operations, simulations and logical verifications using the five-prevention system are essential. Therefore, ensuring the integrity and functionality of the five-prevention system is a key measure to prevent and reduce the incidence of power grid accidents.

[0003] With the continuous expansion of the power grid and the increasing electricity load of users, the requirements for power supply reliability are also constantly improving, making the status and role of the five-prevention system increasingly prominent. However, the existing five-prevention interlocking schemes generally suffer from problems such as complex structure and numerous types of components, resulting in cumbersome equipment assembly processes and significant difficulties in actual construction. Summary of the Invention

[0004] The primary objective of this invention is to provide a five-proof mechanical interlocking structure to address existing problems.

[0005] The second objective of this invention is to provide a ring main unit, including the aforementioned five-proof mechanical interlocking structure.

[0006] To achieve the aforementioned first objective, this invention provides a five-proof mechanical interlocking structure, including a three-position interlocking plate, a circuit breaker interlocking plate, a cable compartment door interlocking plate, and a three-position indicator plate. The plane containing the length and width of the three-position interlocking plate is perpendicular to the horizontal plane. The circuit breaker interlocking plate is located on one side of the thickness direction of the three-position interlocking plate, the cable compartment door interlocking plate is located on one side of the thickness direction of the three-position interlocking plate, and the three-position indicator plate is located on one side of the thickness direction of the three-position interlocking plate. The three-position interlocking plate, the circuit breaker interlocking plate, and the cable compartment door interlocking plate can all move up and down. The three-position indicator can rotate in the vertical plane; the three-position interlocking plate is equipped with a circuit breaker closing stop plate, a three-position stop plate, an isolation stop plate, a first grounding stop plate, and a first working stop plate; the cable compartment door interlocking plate is equipped with a cable compartment door lock limit protrusion, a cable compartment door limit plate, a circuit breaker opening stop plate, a second grounding stop plate, and a second working stop plate; the circuit breaker interlocking plate is equipped with a three-position limit plate; the three-position indicator is located directly above the cable compartment door lock limit protrusion, and the three-position limit plate is located directly below the three-position stop plate.

[0007] As can be seen from the above solution, this invention, by integrating a three-position control unit, circuit breaker, cable compartment door interlocking plate, and indicator, and employing a vertical arrangement with vertical movement and rotation, simplifies the types of components and assembly process. The blocking structures and limit protrusions on each interlocking plate precisely correspond, eliminating misoperation from a mechanical structure perspective, reducing the incidence of power grid accidents, and adapting to the high requirements of power supply reliability in power grid development. It achieves a simple structure, complete functions, convenient operation, significantly reducing the number of assembly parts, and providing highly efficient protection.

[0008] A further embodiment includes a cable compartment door lock extension plate and a cable compartment door lock tongue. The cable compartment door lock extension plate is connected to the side of the cable compartment door interlocking plate away from the three-position interlocking plate, and the cable compartment door lock tongue is connected to the lower end of the cable compartment door lock extension plate, and the cable compartment door lock tongue is located below the cable compartment door interlocking plate.

[0009] As can be seen from the above solution, the addition of an extension plate and latch for the cable compartment door lock, with the extension plate connecting to the cable compartment door interlocking plate, allows the latch to extend below the interlocking plate, optimizing the installation position and stress structure of the latch. This design ensures that the up-and-down movement of the cable compartment door interlocking plate is accurately transmitted to the latch, achieving reliable locking and unlocking of the cable compartment door, avoiding interlock failure due to insufficient latch travel, further improving the protection logic of the five-proof mechanical interlock, and enhancing the safety of the ring main unit operation.

[0010] A further embodiment is that the circuit breaker closing blocking plate extends downward from the bottom of the plane containing the length and width of the three-position interlocking plate; and / or the three-position blocking plate bends and extends away from the bottom of the three-position interlocking plate in a direction away from the cable compartment door interlocking plate; and / or the isolation blocking plate extends from the side of the three-position interlocking plate in a direction close to the cable compartment door interlocking plate; and / or the first grounding blocking plate extends outward from the side of the three-position interlocking plate; and / or the first working blocking plate extends outward from the side of the three-position interlocking plate.

[0011] As can be seen from the above scheme, the forming method of each blocking plate on the three-position interlocking plate is clearly defined. Through the integrated design of downward extension, bending extension, or lateral extension, the splicing and assembly process of parts is reduced, and the assembly difficulty is lowered. The integrated molding of the blocking plate structure has higher structural strength, which can avoid the loosening risk caused by welding or bolt connection, ensure the accurate and reliable blocking limit of the closing, isolation, and grounding positions, extend the service life of the five-proof interlocking structure, and ensure the stability of long-term operation.

[0012] A further embodiment is that the cable compartment door lock limiting protrusion extends from the side of the cable compartment door interlock plate facing the three-position indicator towards the direction close to the three-position indicator; and / or the cable compartment door limiting plate bends and extends from the bottom of the plane containing the length and width of the cable compartment door interlock plate towards the direction close to the three-position interlock plate; and / or the circuit breaker tripping blocking plate extends downward from the bottom; and / or the second grounding blocking plate extends outward from the side of the cable compartment door interlock plate; and / or the second working blocking plate extends outward from the side of the cable compartment door interlock plate.

[0013] As can be seen from the above scheme, the forming method of each functional protrusion and the blocking plate of the cable compartment door interlocking plate is limited, and an integrated structure with extension and bending extension is adopted, which simplifies the processing technology and assembly process. The extension direction of each structure is precisely matched with the matching position of the three-position interlocking plate and the indicator, ensuring that the logical actions such as cable compartment door limit and circuit breaker tripping and blocking are smooth, improving the timeliness of interlocking response, and effectively avoiding the risk of misoperation caused by excessive assembly gaps.

[0014] A further design is that the main body of the three-station indicator is circular, with a notch at the edge of the main body, and an indicator extension plate is provided on one side of the notch, extending radially outward from the three-station indicator.

[0015] As can be seen from the above scheme, the three-station indicator is designed as a circular body with a notch, and with a radially extending extension plate, the rotation of the indicator can be precisely linked with the limit protrusion of the cable compartment door lock. The notch structure enables clear identification of the station status, while the extension plate can reliably trigger the interlock limit. This design is simple in structure, highly recognizable, simplifies the cooperation structure between the indicator and the interlock plate, and improves safety.

[0016] A further option is to also provide a cable compartment door interlocking plate limiter on the circuit breaker interlocking plate. The cable compartment door interlocking plate limiter is located above the three-position limiter and directly above the cable compartment door limiter.

[0017] As can be seen from the above scheme, adding a cable compartment door interlocking plate limit plate to the circuit breaker interlocking plate forms a hierarchical limit structure with the three-position limit plate, which improves the coordination logic between the interlocking plates, makes the logical constraints of each operation step more stringent, and improves the overall interlocking reliability.

[0018] A further option is that the three-position interlocking plate also includes a movable plate, which extends from the side of the three-position interlocking plate toward the cable compartment door interlocking plate; the movable plate is located above the isolation barrier plate.

[0019] As can be seen from the above scheme, the setting of the movable plate enables the displacement of the three-position interlocking plate by manual operation.

[0020] To achieve the second objective mentioned above, the present invention provides a ring main unit, which includes a five-proof mechanical interlocking structure as described in any of the above embodiments.

[0021] As can be seen from the above scheme, the five-proof mechanical interlocking structure applied to the ring main unit (RNB) enables the RNB to possess five-proof functions that are simple in structure, easy to assemble, and reliable in interlocking. This structure effectively solves the problems of numerous parts and difficult assembly in existing RNB five-proof interlocking schemes, significantly improving the overall assembly efficiency of the RNB. At the same time, through the hard protection of mechanical interlocking, it ensures that human error is eliminated during operation of the RNB, improving the operational safety and power supply reliability of the RNB, and adapting to the power grid development needs of increasing user electricity consumption.

[0022] A further option is that the ring main unit includes a circuit breaker interlocking rod, one end of which is connected to the circuit breaker interlocking plate. The circuit breaker interlocking rod is inclined to the horizontal plane and can rotate, thereby driving the circuit breaker interlocking plate to move up and down.

[0023] As can be seen from the above scheme, by setting an inclined circuit breaker interlocking rod, the rotational motion of the circuit breaker is converted into the up-and-down movement of the circuit breaker interlocking plate, thus realizing the mechanical linkage between circuit breaker operation and interlocking action. The inclined design of the interlocking rod results in high transmission efficiency, reasonable force distribution, and greater savings in internal space.

[0024] A further proposed solution is that the five-proof mechanical interlocking structure includes a cable compartment door lock extension plate and a cable compartment door lock tongue. The cable compartment door lock extension plate is connected to the side of the cable compartment door interlocking plate away from the three-position interlocking plate. The cable compartment door lock tongue is connected to the lower end of the cable compartment door lock extension plate and is located below the cable compartment door interlocking plate. The ring main unit includes a cable compartment door, which is located below the five-proof mechanical interlocking structure. The cable compartment door lock tongue can abut against the upper surface of the cable compartment door.

[0025] As can be seen from the above scheme, the cooperation relationship between the cable compartment door latch and the cable compartment door is clearly defined. Interlocking is achieved through the contact between the latch and the upper surface of the cable compartment door, deeply binding the opening and closing status of the cable compartment door with the five-prevention interlocking logic. Only when the interlocking system determines that the operating condition is safe can the latch release its contact restriction on the cable compartment door, mechanically preventing the cable compartment door from being opened while energized. This cooperation method has a simple structure, reliable interlocking, and eliminates the need for an additional door lock mechanism, simplifying the internal structure of the ring main unit while significantly improving the safety protection level of cable compartment operation and maintenance. Attached Figure Description

[0026] Figure 1 This is a first-view structural schematic diagram of the five-proof mechanical interlocking structure of the present invention.

[0027] Figure 2 This is a structural schematic diagram of the five-proof mechanical interlocking structure of the present invention from a second perspective.

[0028] Figure 3 This is a schematic diagram of the structure of the three-station interlocking plate of the present invention.

[0029] Figure 4 This is a schematic diagram of the structure of the cable compartment door interlocking plate of the present invention.

[0030] Figure 5 This is a schematic diagram of the five-proof mechanical interlocking structure of the present invention, which omits the three-position interlocking plate and tension spring.

[0031] Figure 6 This is a schematic diagram of the ring main unit of the present invention.

[0032] Figure 7 yes Figure 6 Enlarged view of point A in the middle.

[0033] Figure 8 This is a cross-sectional view of the ring main unit of the present invention.

[0034] Figure 9 yes Figure 8 Enlarged view of point B in the middle.

[0035] Figure 10 yes Figure 8 A magnified view of point C in the middle.

[0036] Figure 11 This is a first-person view structural diagram of the internal structure of the upper part of the ring main unit.

[0037] Figure 12 This is a first-person sectional view of the internal structure of the upper part of the ring main unit.

[0038] Figure 13 This is a second-view sectional view of the internal structure of the upper part of the ring main unit.

[0039] Figure 14 This is a third-person view diagram of the internal structure of the upper part of the ring main unit.

[0040] Figure 15 This is a fourth-view structural diagram of the internal structure of the upper part of the ring main unit.

[0041] Figure 16 This is a fifth-view structural diagram of the internal structure of the upper part of the ring main unit.

[0042] Figure 17 This is a sixth-angle sectional view of the internal structure of the upper part of the ring main unit.

[0043] The present invention will be further described below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0044] See Figures 1 to 5The present invention provides a five-proof mechanical interlocking structure, which is installed inside a ring main unit.

[0045] The five-proof mechanical connection structure comprises a three-position interlocking plate 2, a cable compartment door interlocking plate 3, a three-position indicator plate 4, a cable compartment door lock extension plate 5, a cable compartment door lock tongue 6, and a circuit breaker interlocking plate 7. The plane containing the length and width of the three-position interlocking plate 2 is perpendicular to the horizontal plane. The cable compartment door interlocking plate 3, the three-position indicator plate 4, and the circuit breaker interlocking plate 7 are all located on the same side along the thickness direction of the three-position interlocking plate 2. The circuit breaker interlocking plate 7 is located between the three-position interlocking plate 2 and the cable compartment door interlocking plate 3. The three-position indicator plate 4 is further away from the three-position interlocking plate 2 than the cable compartment door interlocking plate 3. The cable compartment door lock extension plate 5 is connected to the side of the cable compartment door interlocking plate 3 away from the three-position interlocking plate 2 via a mounting post 115. The cable compartment door lock tongue 6 is connected to the lower end of the cable compartment door lock extension plate 5 and is located below the cable compartment door interlocking plate 3.

[0046] The three-position interlocking plate 2, the cable compartment door interlocking plate 3, the cable compartment door lock extension plate 5, the cable compartment door lock tongue 6, and the circuit breaker interlocking plate 7 can all move up and down, and the three-position indicator plate 4 can rotate in the vertical plane.

[0047] See Figure 2 and Figure 3 The three-position interlocking plate 2 is equipped with a circuit breaker closing blocking plate 21, a three-position blocking plate 22, a moving plate 23, an isolation blocking plate 24, a first grounding blocking plate 25, a first working blocking plate 26, a first tension spring fixing plate 27, a first sliding groove 28, and a second sliding groove 29.

[0048] The circuit breaker closing stop plate 21 extends downward from the bottom of the plane containing the length and width of the three-position interlocking plate 2. The three-position stop plate 22 extends and bends away from the bottom of the three-position interlocking plate 2 towards the cable compartment door interlocking plate 3. The moving plate 23 extends from the side of the three-position interlocking plate 2 towards the cable compartment door interlocking plate 3. The isolation stop plate 24 extends from the side of the three-position interlocking plate 2 towards the cable compartment door interlocking plate 3, and is located below the moving plate 23. The first grounding stop plate 25 and the first working stop plate 26 both extend outward from the side of the three-position interlocking plate 2, and the first grounding stop plate 25 is located above the first working stop plate 26. In this embodiment, the first working stop plate 26 extends outward from the bottom edge of the three-position interlocking plate 2, and the circuit breaker closing stop plate 21 extends downward from the outer edge of the first working stop plate 26. The first tension spring fixing plate 27 extends horizontally outward from the bottom edge of the three-position interlocking plate 2. The first sliding groove 28 and the second sliding groove 29 penetrate the three-position interlocking plate 2 along the thickness direction, and the first sliding groove 28 is located directly below the second sliding groove 29.

[0049] See Figure 4 The cable compartment door interlock plate 3 is provided with a cable compartment door lock limiting protrusion 31, a cable compartment door limiting plate 32, a circuit breaker tripping blocking plate 33, a second grounding blocking plate 34, a second working blocking plate 35, a third sliding groove 36, a fourth sliding groove 37, and a second tension spring fixing plate 38.

[0050] The cable compartment door lock limiting protrusion 31 extends from the side of the cable compartment door interlock plate 3 facing the three-position indicator 4 towards the direction close to the three-position indicator 4. The cable compartment door limiting plate 32 extends and bends from the bottom of the plane containing the length and width of the cable compartment door interlock plate 3 towards the direction close to the three-position interlock plate 2. The circuit breaker tripping blocking plate 33 extends downward from the bottom. In this embodiment, the circuit breaker tripping blocking plate 33 extends downward from the side of the cable compartment door limiting plate 32 close to the three-position interlock plate 2. The second grounding blocking plate 34 and the second working blocking plate 35 both extend outward from the side of the cable compartment door interlock plate 3, and the second grounding blocking plate 34 is located above the second working blocking plate 35. The first grounding blocking plate 25 and the second grounding blocking plate 34 are located in the same vertical direction, and the first working blocking plate 26 and the second working blocking plate 35 are located in the same vertical direction. The third sliding groove 36 and the fourth sliding groove 37 penetrate the cable compartment door interlocking plate 3 along the thickness direction, with the third sliding groove 36 located directly above the fourth sliding groove 37. The second sliding groove 29 and the third sliding groove 36 have a communicating area, as do the first sliding groove 28 and the fourth sliding groove 37. The second tension spring fixing plate 38 is located directly above the first tension spring fixing plate 27, and a tension spring 9 connects the second tension spring fixing plate 38 and the first tension spring fixing plate 27, ensuring that the three-position interlocking plate 2 is in its initial state under natural conditions.

[0051] See Figures 1 to 2 In this embodiment, the main body 41 of the three-position indicator 4 is circular, and a notch 43 is provided on the edge of the main body 41. An indicator extension plate 42 is provided on one side of the notch 43, and the indicator extension plate 42 extends radially outward from the three-position indicator 4. The three-position indicator 4 is located directly above the cable room door lock limiting protrusion 31.

[0052] See Figure 5The circuit breaker interlocking plate 7 is provided with a three-position limiting plate 71, a fifth sliding groove 72, and a cable compartment door interlocking plate limiting plate 73. The three-position limiting plate 71 extends from the side of the circuit breaker interlocking plate 7 closest to the three-position interlocking plate 2, and is located directly below the three-position blocking plate 22. The fifth sliding groove 72 penetrates the circuit breaker interlocking plate 7 along its thickness direction, and has a communicating area with the first sliding groove 28 and the fourth sliding groove 37. The cable compartment door interlocking plate limiting plate 73 is located above the three-position limiting plate 71 and directly above the cable compartment door limiting plate 32. Specifically, the plane of the cable compartment door interlocking plate limiting plate 73 is closer to the cable compartment door interlocking plate 3 than the three-position limiting plate 71.

[0053] See Figures 1 to 17 The ring main unit of the present invention includes an upper part and a lower part. A five-proof mechanical interlocking structure is set in the upper part, and a cable compartment door 18 is set in the lower part. The cable compartment door latch 6 can extend out of the bottom of the upper part 19 and abut against the upper surface 181 of the cable compartment door 18. The cable compartment door 18 is provided with an upward handle 182.

[0054] See Figures 8 to 10 The bottom of the upper door body 19 has a receiving groove 191, which extends downward from the bottom of the upper door body 19 and then extends away from the interior of the ring main unit. The opening of the receiving groove 191 faces the outside of the ring main unit. The frame containing the upper surface 181 of the cable compartment door 18 is located within the receiving groove 191 and can move up and down along the receiving groove 191. A downwardly extending blocking plate 183 is provided at the bottom of the cable compartment door 18, which is located inside the ring main unit. A base frame 10 is provided below the cable compartment door 18, and a limiting plate 100 extending into the ring main unit is provided at the upper end of the base frame 10. The limiting plate 100 abuts against the bottom part of the cable compartment door 18, and the blocking plate 183 abuts against one side of the limiting plate 100 in the horizontal direction. Thus, the limiting plate 100 prevents the blocking plate from moving horizontally, so that the cable compartment door 18 cannot be opened horizontally and can only be opened by lifting it. More preferably, the cable compartment door 18 is provided with downward hooks (not shown in the figure) on both sides to connect with the lower two side frames. The lower two side frames have space for the hooks to move up and down at the corresponding positions. When the cable compartment door 18 is closed, there are frame structures on both sides of the hooks to prevent the hooks from moving in the horizontal direction, and further prevent the cable compartment door 18 from being opened horizontally.

[0055] The upper body 19 is equipped with a circuit breaker closing button 14, a circuit breaker opening button 15, a three-position grounding operation hole protective sleeve 12, a three-position isolation operation hole protective sleeve 13, and a manual energy storage operation hole protective sleeve 162. Inside the upper body are a vertical support 11, a base 17, and an energy storage component 16. The energy storage component 16 is mounted on the base 17. The vertical support 11 is mounted on the base 17.

[0056] The vertical support 11 is equipped with a three-position grounding operation hole 111, a three-position isolation operation hole 112, a first fixing post 113, a second fixing post 114, and a third fixing post 116. The three-position grounding operation hole 111 and its protective sleeve 12 are correspondingly arranged, as are the three-position isolation operation hole 112 and its protective sleeve 13. A three-position interlocking plate 2 and a cable compartment door interlocking plate 3 are positioned between the three-position grounding operation hole 111 and its protective sleeve 12, with the three-position interlocking plate 2 being closer to the three-position grounding operation hole 111 than the cable compartment door interlocking plate 3. The first grounding blocking plate 25, the second grounding blocking plate 34, and the three-position grounding operation hole 111 are located in the same vertical direction, as are the first working blocking plate 26, the second working blocking plate 35, and the three-position isolation operation hole 112. During the rotation of the three-position indicator plate 4, the indicator plate extension plate 42 can be located on the same horizontal plane as the three-position grounding operation hole 111 and the three-position isolation operation hole 112.

[0057] The first fixing post 113 passes through the second sliding groove 29 and the third sliding groove 36, the second fixing post 114 passes through the first sliding groove 28 and the fourth sliding groove 37, and the third fixing post 116 passes through the three-position indicator sign 4.

[0058] The circuit breaker closing button 14 and the circuit breaker opening button 15 are located below the three-position grounding operation hole protective sleeve 12 and the three-position isolation operation hole protective sleeve 13. Furthermore, in this embodiment, the circuit breaker closing button 14 and the circuit breaker opening button 15 are located on the same horizontal plane.

[0059] The circuit breaker closing button 14 is connected to a closing link 141. A first limiting sleeve 142 is fitted over the closing link 141. The closing link 141 extends along a first direction, which is the thickness direction of the three-position interlocking plate 2. The circuit breaker closing blocking plate 21 is aligned with the first limiting sleeve 142 along the first direction and abuts against the first limiting sleeve 142. The circuit breaker opening button 15 is connected to a opening link 151. A second limiting sleeve 152 is fitted over the opening link 151. The opening link extends along the first direction. The circuit breaker opening blocking plate 33 is aligned with the second limiting sleeve 152 along the first direction and abuts against the second limiting sleeve 152.

[0060] A circuit breaker interlocking rod 8 is connected to one side of the three-position limiting plate 71 of the circuit breaker interlocking plate 7. The circuit breaker interlocking rod 8 is inclined to the horizontal plane. A first rotating auxiliary component 81 is connected to the end of the circuit breaker interlocking rod 8 away from the three-position limiting plate 71. One side of the first rotating auxiliary component 81 abuts against a second rotating auxiliary component 82. The second rotating auxiliary component 82 is sleeved on the rotating shaft 821, which is fixed to the energy storage bracket 165. The energy storage bracket 165 is located below the vertical bracket 11 and fixed to the base 17.

[0061] A rotating shaft 821 extends along a second direction, which is the width direction of the three-position interlocking plate 2. A first rotating auxiliary component 81 is connected to the circuit breaker interlocking rod 8. The rotating shaft 821 is located diagonally above the first central shaft 811 and is closer to the three-position interlocking plate 2 than the first central shaft 811. A third auxiliary rotating component 84 is also provided on the energy storage bracket 165. The third rotating auxiliary component 84 can rotate around a second central shaft 841, which is located diagonally above the rotating shaft 821 and is closer to the three-position interlocking plate 2 than the rotating shaft. One end of the third rotating auxiliary component 84 is connected to the circuit breaker interlocking rod 8 via a connecting post 83.

[0062] The rotating shaft 821 can rotate under the action of the energy storage component 16. This drives the second rotating auxiliary component 82 to rotate, and the second rotating auxiliary component 82 abuts against the first rotating auxiliary component 81. Under the action of friction, the first rotating auxiliary component 81 rotates around the first central axis 811. The first rotating auxiliary component 81 is connected to the circuit breaker interlocking rod 8, so that the first rotating auxiliary component 81 drives the circuit breaker interlocking rod 8 to move along the extension direction during rotation, and further, under the action of the second central shaft 841 and the connecting column 83, the circuit breaker interlocking rod 8 causes the circuit breaker interlocking plate 7 to move up or down.

[0063] The energy storage component 16 comprises an energy storage motor 161, a manual energy storage operation port protective sleeve 162, a manual energy storage operation component, an energy storage spring 163, and an energy storage gear 165. The manual energy storage operation port protective sleeve 162 and the manual energy storage operation component are correspondingly arranged. The energy storage gear 165 is sleeved on the outside of the rotating shaft 821. Operators can store energy in the energy storage spring 163 through the energy storage motor 161 and / or the manual energy storage operation component. In the working state, the energy storage spring 163 drives the energy storage gear 165 to rotate under the action of restoring force, thereby driving the rotating shaft 821 to rotate. Specifically, the structure and energy storage principle of the energy storage component 16 are structures and methods well known to those skilled in the art.

[0064] The cable compartment door latch 6 can extend through the base 17 and out of the upper door body 19.

[0065] The other structures of the ring main unit of this invention are the same as those of existing ring main units.

[0066] According to the requirements of the five-proof system, the working principle of the five-proof mechanical interlocking structure of this invention is as follows: 1. When the circuit breaker is in the closed state, the three-position switch cannot be operated. Since the switch corresponding to the three-position switch does not have arc-extinguishing capability, it is prohibited to operate the three-position mechanism while it is energized. Therefore, the circuit may be energized when the circuit breaker is closed, so three-position operation cannot be performed. Specifically, under normal conditions, the three-position interlocking plate 2 blocks the three-position grounding operation hole 111 and the three-position isolation operation hole 112. Operation is performed after the operator applies a downward pulling force to the moving plate 23 to move the three-position interlocking plate 2 down to clear the three-position grounding operation hole 111 and the three-position isolation operation hole 112. To better meet the above requirements, a first tension spring fixing plate 27 is installed on the three-position interlocking plate 2 inside the ring main unit, and a second tension spring fixing plate 38 is installed on the cable compartment door interlocking plate 3. A tension spring 9 connects the second tension spring fixing plate 38 and the first tension spring fixing plate 27, ensuring that the three-position interlocking plate 2 blocks the three-position grounding operation hole 111 and the three-position isolation operation hole 112 under normal conditions. The specific installation method is a method well known to those skilled in the art. When the operator presses the circuit breaker closing button 14 to put the circuit breaker in the closed state, the energy storage spring 163 of the energy storage component 16 releases energy under the action of restoring force, driving the rotating shaft to rotate. This rotation is caused by the first rotating auxiliary component 81, the second rotating auxiliary component 82, the third rotating auxiliary component 83, and the circuit breaker interlocking rod 8, which in turn causes the circuit breaker interlocking plate 7 to move upward. This causes the upper end of the three-position limit plate 71 to abut against the three-position blocking plate 22 of the three-position interlocking plate 2, making it impossible to manually move the three-position interlocking plate 2 downward. Therefore, all three-position operations cannot be performed. The operating hole can only be moved to make way when the circuit breaker is in the open state.

[0067] 2. When the manual operation port baffle of the three-position mechanism is in the open state, the circuit breaker cannot be closed. This is to prevent accidental activation of the circuit breaker during three-position operation, which could lead to energized opening and closing of the three-position. Specifically, during three-position operation, the three-position interlock plate 2 is manually moved down to allow the three-position grounding operation hole 111 and the three-position isolation operation hole 112 to pass. At this time, the circuit breaker closing blocking plate 21 of the lowered three-position interlock plate 2 will block the closing linkage 141. Simultaneously, the circuit breaker closing blocking plate 21 abuts against the first limit sleeve 142, preventing the circuit breaker closing button 14 from being pressed to close the circuit.

[0068] Third, when the third position is in the isolated position, closing the circuit breaker is not allowed. If the circuit breaker is closed, it will be in a "no power input" open-closed state, violating the high-voltage operation principle of "open before closing." Furthermore, simply disconnecting the connection to the main circuit via the isolating switch is not safe; if leakage reduces insulation characteristics, closing the circuit breaker could lead to significant risks such as arcing and short circuits. Specifically, when the third position is in the isolated state, the indicator extension plate 42 of the third position indicator plate 4 abuts against the isolation blocking plate 24 of the third position interlocking plate 2. The indicator extension plate 42 is positioned above the isolation blocking plate 24, preventing the third position interlocking plate 2 from fully moving upwards. At this time, the circuit breaker closing blocking plate 21 continues to block the closing linkage 141, preventing the closing operation from being performed.

[0069] IV. The three states (connected, isolated, and grounded) of the three-position mechanism are independent of each other. Therefore, when the disconnector is closed, the grounding switch cannot be operated; similarly, when the grounding switch is closed, the disconnector cannot be operated. Only when in the isolated state can either the grounding switch or the disconnector be operated. Specifically, this process is adjusted by the three-position indicator 4. During the rotation of the three-position indicator 4, the indicator extension plate 42 blocks the three-position grounding operation hole 111, and the disconnector can be closed. When the indicator extension plate 42 rotates between the three-position grounding operation hole 111 and the three-position isolation operation hole 112, it is in the isolated state. When the indicator extension plate 42 rotates to block the three-position isolation operation hole 112, the grounding switch can be closed.

[0070] 5. The cable compartment door 18 can only be opened when the three-position is in the grounded closed state and the circuit breaker is in the closed state. Maintenance of the cable compartment door 18 can only be performed when the cable compartment is in a safe, de-energized, and grounded state. The cable compartment door 18 needs to be raised to a certain height before it can be opened. Under normal conditions, the cable compartment door latch 6 is always pressed against the cable compartment door 18, preventing it from being raised. The cable compartment door interlock plate 3 can only move upwards when the three-position is in the isolated state and the circuit breaker is closed, thus allowing the cable compartment door 18 to be raised and opened. Specifically, when the circuit breaker is in the open state, the cable compartment door interlock plate limit plate 73 of the circuit breaker interlock plate 7 abuts against the cable compartment door limit plate 32, thereby preventing the cable compartment door interlock plate 3 from moving upwards. When the three-position is in the ungrounded state, the three-position indicator 4 abuts against the cable compartment door lock limit protrusion 31, preventing the cable compartment door interlock plate 3 from moving upwards. Only when the circuit breaker is closed and the three-position indicator is grounded can the cable compartment door lock limit protrusion 31 move along the notch 43 of the three-position indicator 4, and the circuit breaker interlock plate 7 is also in an elevated state, while the cable compartment door interlock plate 3 is not restricted from moving upward. This causes the cable compartment door lock extension plate 5 and the cable compartment door lock tongue 6 to rise, so that the cable compartment door lock tongue 6 no longer abuts against the upper surface 181 of the cable compartment door 18, thereby allowing the cable compartment door 18 to be lifted.

[0071] VI. When the cable compartment door 18 is open, the three-position and circuit breaker operations cannot be performed. When the cable compartment door can be opened, the three-position is in the grounded closed state and the circuit breaker is in the closed state. To ensure that the cable compartment remains in a safe grounded state during maintenance, the circuit breaker cannot be tripped and the three-position cannot be operated when the cable compartment door 18 is open. Specifically, when the cable compartment door 18 is lifted and opened, the door is moved away, and the lower part of the cable compartment door latch 6 is suspended and moves down to the limit position under the influence of gravity. At this time, the connected cable compartment door interlock plate 3 also moves down under the influence of gravity, and the circuit breaker tripping blocking plate 33 jams the tripping linkage 151. At the same time, the circuit breaker tripping blocking plate 33 abuts against the second limit sleeve 152, making it impossible to press the circuit breaker tripping button 15 to trip. In addition, the second grounding blocking plate 34 and the second working blocking plate 35 block the three-position grounding operation hole 111 and the three-position isolation operation hole 112.

[0072] The five-proof mechanical interlock structure of the present invention is simple, functional, and easy to operate, greatly reducing the number of assembly parts and enabling efficient protection.

[0073] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A five-proof mechanical interlocking structure, characterized in that: This includes a three-position interlocking plate, a circuit breaker interlocking plate, a cable compartment door interlocking plate, and a three-position indicator sign. The plane containing the length and width of the three-position interlocking plate is perpendicular to the horizontal plane. The circuit breaker interlocking plate is located on one side of the thickness direction of the three-position interlocking plate. The cable compartment door interlocking plate is located on one side of the thickness direction of the three-position interlocking plate. The three-position indicator is located on one side of the thickness direction of the three-position interlocking plate. The three-position interlocking plate, the circuit breaker interlocking plate, and the cable compartment door interlocking plate can all move up and down. The three-position indicator can rotate in the vertical plane. The three-position interlocking plate is equipped with a circuit breaker closing blocking plate, a three-position blocking plate, an isolation blocking plate, a first grounding blocking plate, and a first working blocking plate; the cable compartment door interlocking plate is equipped with a cable compartment door lock limiting protrusion, a cable compartment door limiting plate, a circuit breaker opening blocking plate, a second grounding blocking plate, and a second working blocking plate; the circuit breaker interlocking plate is equipped with a three-position limiting plate. The three-position indicator is located directly above the cable room door lock limit protrusion, and the three-position limit plate is located directly below the three-position blocking plate.

2. The five-proof mechanical interlocking structure as described in claim 1, characterized in that: It also includes a cable compartment door lock extension plate and a cable compartment door lock tongue. The cable compartment door lock extension plate is connected to the side of the cable compartment door interlocking plate away from the three-position interlocking plate. The cable compartment door lock tongue is connected to the lower end of the cable compartment door lock extension plate and is located below the cable compartment door interlocking plate.

3. The five-proof mechanical interlocking structure as described in claim 1, characterized in that: The circuit breaker closing stop plate extends downward from the bottom of the plane containing the length and width of the three-position interlocking plate; and / or The three-position blocking plate is formed by bending and extending from the bottom of the three-position interlocking plate in a direction away from the cable compartment door interlocking plate; and / or The isolation barrier extends from the side of the three-position interlocking plate toward the cable compartment door interlocking plate; and / or The first grounding blocking plate extends outward from the side of the three-position interlocking plate; and / or The first working blocking plate extends outward from the side of the three-station interlocking plate.

4. A five-proof mechanical interlocking structure as described in claim 1, characterized in that: The cable compartment door lock limiting protrusion extends from the side of the cable compartment door interlock plate facing the three-position indicator sign towards the three-position indicator sign; and / or The cable compartment door limiting plate is formed by bending and extending from the bottom of the plane containing the length and width of the cable compartment door interlocking plate towards the direction close to the three-position interlocking plate; and / or The circuit breaker tripping baffle plate extends downwards from the bottom; and / or The second grounding barrier plate extends outward from the side of the cable compartment door interlock plate; and / or The second working blocking plate extends outward from the side of the cable compartment door interlocking plate.

5. The five-proof mechanical interlocking structure as described in claim 1, characterized in that: The main body of the three-station indicator is circular, and a notch is provided on the edge of the main body of the three-station indicator. An indicator extension plate is provided on one side of the notch, and the indicator extension plate extends radially outward from the three-station indicator.

6. The five-proof mechanical interlocking structure as described in claim 1, characterized in that: The circuit breaker interlocking plate is also provided with a cable compartment door interlocking plate limiter, which is located above the three-position limiter and directly above the cable compartment door limiter.

7. A five-proof mechanical interlocking structure as described in any one of claims 1 to 6, characterized in that: The three-position interlocking plate also includes a movable plate, which extends from the side of the three-position interlocking plate toward the cable compartment door interlocking plate. The movable plate is located above the isolation barrier plate.

8. A ring main unit, characterized in that: The ring main unit includes a five-proof mechanical interlocking structure as described in any one of claims 1 to 7.

9. A ring main unit as described in claim 8, characterized in that: The ring main unit includes a circuit breaker interlocking rod, one end of which is connected to the circuit breaker interlocking plate. The circuit breaker interlocking rod is inclined to the horizontal plane and can rotate to drive the circuit breaker interlocking plate to move up and down.

10. A ring main unit as described in claim 8, characterized in that: The five-proof mechanical interlocking structure includes a cable compartment door lock extension plate and a cable compartment door lock tongue. The cable compartment door lock extension plate is connected to the side of the cable compartment door interlocking plate away from the three-position interlocking plate. The cable compartment door lock tongue is connected to the lower end of the cable compartment door lock extension plate and is located below the cable compartment door interlocking plate. The ring main unit includes a cable compartment door, which is located below the five-proof mechanical interlocking structure, and the cable compartment door latch can abut against the upper surface of the cable compartment door.

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