Large-current environment-friendly ring main unit

Abstract

The invention discloses a large-current environment-friendly ring main unit which comprises an isolating switch and a circuit breaker structure, the isolating switch is located above the circuit breaker structure, the isolating switch and the circuit breaker structure are fixedly connected, the isolating switch comprises a moving knife assembly, the moving knife assembly comprises a moving knife and a moving knife holder, the moving knife is rotationally connected with the moving knife holder, the moving knife is provided with segmented contacts, and the moving knife is connected with the circuit breaker structure. The structure of the conductive copper piece is optimized, the effective lap joint number between lap joint faces and the heat dissipation area are increased, the heat dissipation efficiency is effectively improved, and the 1250A * 1.1 temperature rise test requirement is met in dry air.

Description

Technical Field

[0001] The present invention belongs to the field of electrical technology and relates to an environmentally friendly ring main unit with large current. Background Art

[0002] With the advancement of the global wave of green manufacturing, traditional sulfur hexafluoride gas (greenhouse gas) ring main units will eventually be replaced by green and environmentally friendly dry air gas, and each manufacturer has developed environmentally friendly gas cabinets.

[0003] With the popularization of the State Grid in 2023, 12kA / 630A environmentally friendly cabinets gradually replace sulfur hexafluoride gas ring main units year by year. However, it is difficult to replace the 1250A specification ring main unit. The difficulties are as follows: 1. The heat dissipation of dry air is only one-third of that of sulfur hexafluoride gas, and the heat dissipation performance of the environmentally friendly cabinet is poor; 2. The structure of the enclosed isolating knife is not conducive to heat dissipation; as a result, the upper limit parameter of the actual operation of the 1250A ring main unit can only meet the 1.0 times temperature rise test. Summary of the Invention

[0004] In order to overcome at least one deficiency of the prior art, the present invention provides an environmentally friendly ring main unit with large current.

[0005] To achieve the above object, the present invention adopts the following technical solutions: An environmentally friendly ring main unit with large current, including a disconnector and a circuit breaker structure. The disconnector is located above the circuit breaker structure and the two are fixedly connected. The disconnector includes a moving knife assembly. The moving knife assembly includes a moving knife and a moving knife seat. The moving knife and the moving knife seat are rotatably connected. The moving knife is provided with segmented contacts. The vacuum interrupter includes a static end, and the static end is fixedly connected to the moving knife seat.

[0006] Further, the moving knife is provided with a convex bump, the moving knife seat is provided with a recess, the convex bump and the recess are fitted, and the moving knife and the moving knife seat are rotatably connected through a spring contact seat.

[0007] Further, the moving knife assembly further includes a double-point disc spring, and the double-point disc spring is fixedly arranged on the moving knife and close to the segmented contacts.

[0008] Further, the spring contact seat includes a pin rod and a spring. The pin rod passes through the moving knife and the moving knife seat to rotatably connect the two. The spring is arranged between the moving knife and the end face of the pin rod. The end face of the moving knife away from the moving knife seat is provided with an inner groove, and the end face of the pin rod and the spring are located in the inner groove.

[0009] Further, the moving knife seat includes a connection end and an installation end. The connection end is fixedly arranged on the installation end to form a T-shaped structure, and the connection end is a flat plate structure.

[0010] Further, the static end is provided with four fixing points, and the installation end is provided with four installation holes. The four installation holes are symmetrically distributed in pairs with the connection end as the center. The fixing points are opposite to the four installation holes, and fasteners connect the installation holes and the fixing points to firmly connect the installation end and the vacuum interrupter.

[0011] Further, the disconnector further includes a disconnector frame, a disconnector static contact, a disconnector transmission component, a disconnector main shaft, and a grounding static contact. The disconnector main shaft is rotatably connected to the disconnector frame. The disconnector transmission component is connected to the disconnector main shaft, and the moving blade is connected to the disconnector transmission component. The disconnector static contact is fixedly connected to the insulating cross beam of the disconnector frame through the main busbar.

[0012] Further, the main busbar is a soft-connected copper foil.

[0013] Further, the circuit breaker structure further includes a circuit breaker frame, a circuit breaker transmission component, a circuit breaker main shaft, an installation component, and a branch copper bar. The circuit breaker main shaft is rotatably connected to the circuit breaker frame. The circuit breaker transmission component is connected to the circuit breaker main shaft and the vacuum interrupter.

[0014] Further, the branch copper bar is provided with a soft connection structure.

[0015] In summary, the beneficial effects of the present invention are as follows:

[0016] 1) The present invention sets segmented contacts on the moving blade, which can increase the number of contact points of the disconnector in the closed state, effectively improving the efficiency of electron passage. At the same time, it can achieve better lapping to ensure effective connection. Compared with the existing method of lapping through a whole structure, it does not require high processing and assembly processes, thus greatly reducing the installation and processing difficulty of parts.

[0017] 2) The double-point disc spring of the present invention can effectively provide the contact stability of the edge contacts and provide independent contact pressure for the segmented contacts.

[0018] 3) The moving blade of the present invention adopts a non-wrapped structure, which is beneficial to heat dissipation.

[0019] 4) The convex structure of the moving blade of the present invention effectively increases the contact area compared with the existing plane. When the convex part is fitted and installed with the concave part, the moving blade and the moving blade seat are lapped, thus effectively increasing the number of contact points between the moving blade and the moving blade seat. At the same time, the fitting of the convex part and the concave part is relatively flexible and has a movable space. Combined with the spring contact seat, in the closed state, it can prevent ineffective lapping points caused by the deviation of the moving blade, ensuring the lapping effectiveness when there is an allowable angular deviation between the installation plane of the moving blade and the moving blade seat.

[0020] 5) The connection end of the moving blade seat of the present invention is a flat plate structure, effectively increasing the heat dissipation area.

[0021] 6) The main busbar of the present invention is a soft-connected copper foil, and the copper foil is a thin sheet structure. Compared with the main busbar of the existing copper busbar structure, for the copper busbar and copper foil with the same volume, the surface area of the copper foil is larger and the heat dissipation capacity is stronger.

[0022] 7) Four mounting holes are provided at the mounting end of the moving knife seat of the present invention. The four mounting holes are symmetrically distributed in pairs with the connection end as the center. Fixed points opposite to the four mounting holes are provided at the static end of the vacuum interrupter. Fasteners connect the mounting holes and the fixed points to firmly connect the mounting end and the vacuum interrupter. The symmetrical structure of the mounting holes and the fixed points can reduce the lateral width of the main circuit, facilitate the subsequent expansion of the lower isolation structure, and reduce the overall height.

[0023] 8) The branch copper busbar of the present invention is a soft-connected structure as a whole, excluding the overlapping points, thereby improving the heat dissipation capacity of the conductive part; in addition, the soft connection is a copper foil structure by potting, and the surface area of the copper foil is larger, with a larger heat dissipation area, thereby effectively improving the heat dissipation efficiency.

[0024] 9) By optimizing the structure of the conductive copper parts, the present invention improves the effective overlapping quantity and heat dissipation area between the overlapping surfaces, effectively improves the heat dissipation efficiency, and meets the temperature rise test requirements of A× in dry air. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Isometric view of the upper isolation breaker of the present invention.

[0026] Figure 2 Isometric view of the disconnecting switch of the present invention.

[0027] Figure 3 Internal schematic diagram of the disconnecting switch of the present invention. Disconnecting switch 1 and breaker structure

[0028] Figure 4 Isometric view of the moving knife of the present invention.

[0029] Figure 5 Schematic diagram of the moving knife of the present invention.

[0030] Figure 6 Schematic diagram of the moving knife seat of the present invention.

[0031] Figure 7 Partial cross-sectional view of the assembly of the moving knife and the moving knife seat of the present invention.

[0032] Figure 8 Isometric view of the breaker structure of the present invention in one direction.

[0033] Figure 9 Isometric view of the breaker structure of the present invention in another direction.

[0034] Figure 10 Side view of the circuit breaker structure according to the present invention.

[0035] Figure 11 Axonometric view of the upper mounting plate of the present invention in one direction.

[0036] Figure 12 Axonometric view of the upper mounting plate of the present invention in another direction.

[0037] Figure 13 Axonometric view of the moving knife seat and the upper mounting plate assembled according to the present invention.

[0038] Figure 14 Axonometric view of the vacuum arc extinguishing chamber according to the present invention. Specific embodiments

[0039] The following specific examples illustrate the embodiments of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0040] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0041] All directional indications (such as up, down, left, right, front, back, horizontal, vertical...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture. If this specific posture changes, the directional indications will also change accordingly.

[0042] Due to reasons such as installation errors, the parallel relationship referred to in the embodiments of the present invention may actually be an approximate parallel relationship, and the vertical relationship may actually be an approximate vertical relationship.

[0043] Embodiment 1:

[0044] As Figures 1 - 14As shown in the figure, an environmentally friendly ring main unit with large current includes a disconnector 1 and a circuit breaker structure 2. The disconnector 1 includes a moving blade assembly 12. The moving blade assembly 12 includes a moving blade 120 and a moving blade seat 122. The moving blade 120 and the moving blade seat 122 are rotatably connected through a spring contact seat 123. The moving blade 120 is provided with segmented contacts 1200. The circuit breaker structure 2 includes a vacuum interrupter 21. The moving blade seat 122 is fixedly connected to the vacuum interrupter 21.

[0045] The segmented contacts 1200 are specifically as follows:

[0046] The moving blade 120 is provided with a protruding contact block. The contact block is arc-shaped and is distributed along the width of the moving blade 120. The moving blade 120 is provided with a plurality of grooves 1205. The length direction of the grooves 1205 is consistent with the length direction of the moving blade 120. The contact block is divided into a plurality of segmented contacts 1200 through the grooves 1205. The segmented contacts 1200 increase the number of contact points of the disconnector in the closed state, effectively improving the efficiency of electron passing. At the same time, better lapping can be achieved to ensure effective connection. Compared with the existing method of lapping through a whole block structure, this embodiment does not require high processing and assembly processes, thus greatly reducing the installation and processing difficulty of parts.

[0047] The moving blade assembly 12 further includes a double-point disc spring 121. The double-point disc spring 121 is fixedly arranged on the moving blade 120 and close to the segmented contacts 1200. The double-point disc spring 121 is distributed along the width direction of the moving blade 120. The existing single-point disc spring is used. The position of the single-point disc spring from the contact point is far, and the moving blade is too large, resulting in the weakening of the force transmission to the edge of the moving blade. In this application, the double-point disc spring can effectively provide the contact stability of the edge contacts and provide independent contact pressure for the segmented contacts.

[0048] The moving blade 120 of this application has an unconventional wrapped structure, which is beneficial to heat dissipation.

[0049] Both ends of the moving blade 120 are set as a fixed end 1203 and a free end 1204. The segmented contacts 1200 are arranged at the free end 1204. The fixed end 1203 is rotatably connected to the moving blade seat 122.

[0050] The moving blade 120 and the moving blade seat 122 are connected through a spring contact seat 123. Specifically, the spring contact seat 123 includes a pin rod 1231 and a spring 1232. The moving blade 120 is provided with a convex hull 1201. The moving blade seat 122 is provided with a recess 1221. The convex hull 1201 is fitted with the recess 1221. The pin rod 1231 passes through the moving blade 120 and the moving blade seat 122 to rotatably connect the two. The spring 1232 is arranged between the moving blade 120 and the end face of the pin rod 1231.

[0051] The pin rod 1231 uses a conventional structure to realize the rotational connection between the moving blade 120 and the moving blade seat 122, which will not be elaborated here.

[0052] The convex hull 1201 structure of the moving blade 120 effectively increases the contact area compared with the existing plane. When the convex hull 1201 is fitted and installed with the recess 1221, the moving blade 120 is lapped with the moving blade seat 122, thereby effectively increasing the number of contact points between the moving blade 120 and the moving blade seat 122. At the same time, the fitting of the convex hull and the recess 1221 is relatively flexible and has a movable space. In the closed state, it can prevent ineffective lap joints caused by the deflection of the moving blade, ensuring the lap effectiveness when there is an allowable angular offset between the installation plane of the moving blade and the moving blade seat.

[0053] An inner groove 1202 is provided on the end face of the moving blade 120 away from the moving blade seat 122, and the end face of the pin rod 1231 and the spring 1232 are located in the inner groove 1202.

[0054] The moving blade seat 122 is provided with a T-shaped structure, including a connecting end 1221 and an installation end 1222. The connecting end 1221 is fixedly arranged on the installation end 1222 to form a T-shaped structure. The connecting end 1221 is connected to the moving blade 120. Compared with the existing round rod-shaped moving blade seat, the connecting end 1221 of the present application is a flat plate structure, effectively increasing the heat dissipation area.

[0055] Four installation holes 1223 are provided on the installation end 1222. The four installation holes 1223 are symmetrically distributed in pairs with the connecting end 1221 as the center. The static end 211 of the vacuum interrupter 21 is provided with fixing points 2111 opposite to the four installation holes 1223. Fasteners such as screws and bolts connect the installation holes 1223 and the fixing points 2111 to firmly connect the installation end 1222 and the vacuum interrupter 21. The symmetrical structure of the installation holes 1223 and the fixing points 2111 can reduce the lateral width of the main circuit, facilitating the subsequent expansion of the lower isolation structure and the reduction of the overall height.

[0056] The disconnecting switch 1 further includes a disconnecting switch frame 11, a disconnecting switch static contact 13, a disconnecting switch transmission component 14, a disconnecting switch main shaft 15 and a grounding static contact 16. The disconnecting switch main shaft 15 is rotatably connected to the disconnecting switch frame 11. The disconnecting switch transmission component 14 is connected to the disconnecting switch main shaft 15. The moving blade 120 is connected to the disconnecting switch transmission component 14. The moving blade 120 contacts the disconnecting switch static contact 13 or the grounding static contact 16.

[0057] The disconnecting switch frame 11 includes a disconnecting switch frame front plate 111, a disconnecting switch frame rear plate 112, a grounding cross beam 113 and an insulating cross beam 114. The disconnecting switch frame front plate 111 and the disconnecting switch frame rear plate 112 are arranged in parallel. The grounding cross beam 113 and the insulating cross beam 114 are arranged in parallel. The two ends of the grounding cross beam 113 and the insulating cross beam 114 are fixedly connected to the disconnecting switch frame front plate 111 and the disconnecting switch frame rear plate 112 respectively.

[0058] Specifically for the connection between the insulating crossbeam 114 and the front plate 111 and the rear plate 112 of the disconnector frame, the front plate 111 of the disconnector frame is provided with a first bent plate, the rear plate 112 of the disconnector frame is provided with a second bent plate, and both ends of the insulating crossbeam 114 are fixedly connected to the first bent plate and the second bent plate by bolts.

[0059] Specifically for the connection between the grounding crossbeam 113 and the front plate 111 and the rear plate 112 of the disconnector frame, both ends of the grounding crossbeam 113 are provided with a third bent plate and a fourth bent plate. The third bent plate is fixedly connected to the front plate 111 of the disconnector frame by bolts, and the fourth bent plate is fixedly connected to the rear plate 112 of the disconnector frame by bolts.

[0060] The static contact 13 of the disconnector is fixedly connected to the insulating crossbeam 114 through the main busbar 31. The main busbar 31 is made of a flexible copper foil. The copper foil is a thin sheet structure. Compared with the existing main busbar with a copper bar structure, for the same volume of copper bar and copper foil, the copper foil has a larger surface area and stronger heat dissipation capacity.

[0061] The grounding static contact 16 is fixedly arranged on the grounding crossbeam 113 through the grounding bar.

[0062] The moving blade 120 is connected to the disconnector main shaft 15 through the disconnector transmission component 14. The disconnector main shaft 15 transmits the motion to the moving blade 120 through the disconnector transmission component 14. The moving blade 120 changes the grounding, isolation or closing position, thereby realizing the grounding, opening and closing states of the disconnector 2.

[0063] The disconnector transmission component 14 includes two groups of symmetrically arranged isolation crank arms 141 and two groups of symmetrically arranged moving blade tie rods 142. The fixed end of the isolation crank arm 141 is fixedly connected to the disconnector main shaft 15. The disconnector main shaft 15 drives the isolation crank arm 141 to rotate synchronously. The free end of the isolation crank arm 141 is rotatably connected to the two groups of moving blade tie rods 142 through pins. The moving blade 120 is located between the two groups of moving blade tie rods 142 and is rotatably connected through pins.

[0064] The disconnector main shaft 15 is fixedly provided with a limit pin. The limit pin is located on both sides of the isolation crank arm 141 to limit the isolation crank arm 141 and prevent the isolation crank arm 141 from moving axially along the disconnector main shaft 15.

[0065] The output end of the disconnector main shaft 15 is rotatably connected to the rear plate 112 of the disconnector frame. The input end of the disconnector main shaft 15 penetrates through the front plate 111 of the disconnector frame and is dynamically sealedly connected to the front plate 111 of the disconnector frame.

[0066] In this embodiment, the disconnector can be used alone in existing equipment. Structures of the disconnector not described adopt existing components and will not be elaborated here.

[0067] The circuit breaker structure 2 further includes a circuit breaker frame 20, a circuit breaker transmission component 22, a circuit breaker main shaft 23, a mounting component 24, and a branch copper bus 25. The circuit breaker main shaft 23 is rotatably connected to the circuit breaker frame 20. The circuit breaker transmission component 22 is connected to the circuit breaker main shaft 23 and the vacuum interrupter 21. The circuit breaker main shaft 23 transmits the motion to the moving end of the vacuum interrupter 21 through the circuit breaker transmission component 22 to realize the release or separation of the moving contact and the static contact. The mounting component 24 supports the vacuum interrupter 21, and the branch copper bus 25 is provided with a flexible connection structure.

[0068] The circuit breaker frame 20 includes a circuit breaker front plate 204, a circuit breaker rear plate 202, a circuit breaker first side plate 201, and a circuit breaker second side plate 203. The circuit breaker front plate 204 and the circuit breaker rear plate 202 are arranged in parallel. The circuit breaker first side plate 201 and the circuit breaker second side plate 203 are arranged in parallel. The circuit breaker first side plate 201 and the circuit breaker second side plate 203 are located at both ends of the circuit breaker front plate 204 and the circuit breaker rear plate 202 and are fixedly connected.

[0069] Specifically, regarding the connection between the circuit breaker first side plate 201 and the circuit breaker front plate 204 and the circuit breaker rear plate 202, fifth bending plates and sixth bending plates are provided on both sides of the circuit breaker first side plate 201. The circuit breaker front plate 204 and the fifth bending plate of the circuit breaker first side plate 201 are fixedly connected by bolts. The circuit breaker rear plate 202 and the sixth bending plate of the circuit breaker first side plate 201 are fixedly connected by bolts. The connection between the circuit breaker second side plate 203 and the circuit breaker front plate 204 and the circuit breaker rear plate 202 is the same as the above connection structure and will not be elaborated here.

[0070] The circuit breaker first side plate 201 is fixedly connected to the rear plate 112 of the disconnector frame, and the circuit breaker second side plate 203 is fixedly connected to the front plate 111 of the disconnector frame to realize the connection between the disconnector frame 11 and the circuit breaker frame 20.

[0071] The mounting component 24 includes an upper mounting plate 241 and a lower mounting plate 242. The upper mounting plate 241 and the lower mounting plate 242 are located on the upper and lower sides of the vacuum interrupter 21 to support it. The upper mounting plate 241 and the lower mounting plate 242 are clamped to the circuit breaker front plate 204 and the circuit breaker rear plate 202.

[0072] The vacuum interrupter 21 includes a static end 211 and a moving end 212. The static end 211 is connected to the moving knife seat 122 through the upper mounting plate 241, and the moving end 212 is connected to the circuit breaker transmission component 22 through the vacuum pull rod 213.

[0073] The moving knife holder 122 is connected to the vacuum interrupter 21 through the upper mounting plate 241. Specifically, a through slot 2411 and an annular groove 2413 are provided in the thickness direction of the upper mounting plate 241. The through slot 2411 and the annular groove 2413 are communicated. The upper mounting plate 241 is also provided with a plurality of through holes 2412, and the through holes 2412 are symmetrically distributed in pairs with the through slot 2411 as the center. The through holes 2412 correspond to the mounting holes 1223 and the fixing points 2111 one by one. The connecting end 1221 of the moving knife holder 122 penetrates through the through slot 2411, and the mounting end 1222 and the static end 211 are arranged in the annular groove 2413. Fasteners such as screws and bolts connect the through holes 2412, the mounting holes 1223 and the fixing points 2111 to firmly connect the upper mounting plate 241, the moving knife holder 122 and the vacuum interrupter 21.

[0074] The conventional branch copper bus is a structure combining a flexible connection and a copper bus. This structure adds a lap joint between the two, increasing the loop resistance and making it difficult to dissipate heat. In this application, the branch copper bus 25 is a whole flexible connection structure, removing the lap joint, thereby improving the heat dissipation capacity of the conductive part. In addition, the flexible connection is a copper foil structure by potting, and the surface area of the copper foil is larger, having a larger heat dissipation area, thereby effectively improving the heat dissipation efficiency.

[0075] The branch copper bus 25 is set in an L shape and is connected to the circuit breaker frame 20. Specifically, the front panel 204 and the rear panel 202 of the circuit breaker are provided with horizontal notches. The branch copper bus 25 includes a horizontal forming plate and a vertical forming plate. The horizontal forming plate passes through the horizontal notch and overlaps on the front panel 204 and the rear panel 202 of the circuit breaker. The branch copper bus 25 located between the front panel 204 and the rear panel 202 of the circuit breaker is connected to the vacuum pull rod 213, and the vertical forming plate is located outside the circuit breaker frame 20 and is fixedly connected to the circuit breaker frame 20 by bolts.

[0076] The output end of the circuit breaker main shaft 23 is rotatably connected to the first side panel 201 of the circuit breaker, and the input end of the circuit breaker main shaft 23 penetrates through the second side panel 203 of the circuit breaker and is movably sealedly connected to the second side panel 203 of the circuit breaker.

[0077] The structure of the circuit breaker transmission component 22 in this embodiment adopts the structure set by the conventional circuit breaker structure, and a model based on the circuit breaker structure is selected. This application has not been improved and will not be limited and elaborated here.

[0078] In this embodiment, the circuit breaker structure can be used alone in existing equipment. The structures not described in the circuit breaker structure adopt existing components and will not be elaborated here.

[0079] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

Claims

1. A large current environmental protection ring network cabinet, characterized by: It includes an isolating switch and a circuit breaker structure. The isolating switch is located above the circuit breaker structure and the two are fixedly connected. The isolating switch includes a moving knife assembly. The moving knife assembly includes a moving knife and a moving knife seat. The moving knife and the moving knife seat are rotatably connected. The moving knife is provided with segmented contacts. The vacuum arc extinguishing chamber includes a static end, and the static end is fixedly connected to the moving knife seat.

2. The large current environmental protection ring main unit according to claim 1, characterized in that: The movable knife is provided with a convex bump, and the movable knife seat is provided with a concave bump, the convex bump is engaged with the concave bump, and the movable knife and the movable knife seat are rotationally connected through a spring contact seat.

3. The large current environmental protection ring main unit according to claim 1, characterized in that: The movable knife assembly also includes a double-point disc spring, which is fixed to the movable knife and close to the segmented contact point.

4. The large current environmental protection ring main unit according to claim 2 is characterized in that: The spring contact seat includes a pin rod and a spring. The pin rod passes through the movable knife and the movable knife seat to rotationally connect the two. The spring is arranged between the movable knife and the end face of the pin rod. The end face of the movable knife away from the movable knife seat is provided with an inner groove. The end face of the pin rod and the spring are located in the inner groove.

5. The large current environmental protection ring main unit according to claim 1 is characterized in that: The movable knife seat comprises a connecting end and a mounting end. The connecting end is fixedly arranged on the mounting end to form a T-shaped structure. The connecting end is a flat plate structure.

6. The large current environmental protection ring main unit according to claim 5, characterized in that: The static end is provided with four fixing points, and the mounting end is provided with four mounting holes. The four mounting holes are symmetrically distributed in pairs with the connecting end as the center. The fixing points are opposite to the four mounting holes. Fasteners connect the mounting holes and the fixing points to fasten the mounting end to the vacuum arc extinguishing chamber.

7. The large current environmental protection ring main unit according to claim 1, characterized in that: The isolating switch also includes an isolating switch frame, an isolating switch static contact, an isolating switch transmission component, an isolating switch main shaft and a grounding static contact. The isolating switch main shaft is rotatably connected to the isolating switch frame, the isolating switch transmission component is connected to the isolating switch main shaft, the moving knife is connected to the isolating switch transmission component, and the isolating switch static contact is fixedly connected to the insulating crossbeam of the isolating switch frame through the main busbar.

8. The large current environmental protection ring main unit according to claim 7, characterized in that: The main busbar is configured as a soft-connected copper foil.

9. The large current environmental protection ring main unit according to claim 1, characterized in that: The circuit breaker structure also includes a circuit breaker frame, a circuit breaker transmission component, a circuit breaker main shaft, a mounting assembly and a branch copper busbar. The circuit breaker main shaft is rotatably connected to the circuit breaker frame, and the circuit breaker transmission component is connected to the circuit breaker main shaft and the vacuum interrupter.

10. The large current environmental protection ring main unit according to claim 9, characterized in that: The branch copper busbar is configured as a soft connection structure.

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