Environmentally friendly gas-insulated ring main units and their line-side three-position switches and circuit breaker modules

Abstract

This utility model relates to a switchgear enclosed in a housing, and more particularly to an environmentally friendly gas-insulated ring main unit and its line-side three-position switch and circuit breaker module. This utility model improves upon existing ring main units by employing a novel three-position switch. The three-position switch utilizes a circuit breaker module with all three phase solid-sealed poles cast into an insulating housing as a single unit. This results in better overall integrity of the three-phase solid-sealed poles, greater structural strength and rigidity, effective control of bounce, excellent short-circuit making capability, uniform and reliable switching electric field, improved insulation performance, and a compact overall structure with smaller dimensions, thus reducing the overall size of the ring main unit.

Description

Technical Field

[0001] This utility model relates to a switchgear enclosed in a housing, and more particularly to an environmentally friendly gas-insulated ring main unit and its line-side three-position switch and circuit breaker module. Background Technology

[0002] Environmentally friendly gas-insulated ring main units (RMMs) offer advantages such as reliable power supply and good economy, and are widely used in medium-voltage urban distribution networks. The integrated primary and secondary ring main units explicitly require environmentally friendly gas-insulated RMMs to adopt a three-position scheme on the line side. However, because environmentally friendly RMMs lack SF6 gas as an arc-quenching medium to ensure good insulation, the cabinet size of existing environmentally friendly gas-insulated RMMs cannot be as compact as that of SF6 RMMs, resulting in larger RMM sizes that cannot meet the special requirements of some operating environments. Furthermore, when the three-position line-side switches within the RMM directly close the short-circuit fault current of the cable outlet using the isolating grounding switch, the arc burning generated during pre-breakdown must be overcome, thus requiring a very fast closing speed. Existing RMMs often employ complex frame structures to fix the three-phase circuit breakers separately to improve product rigidity and control bounce, but this method also results in a larger RMM size. Utility Model Content

[0003] The purpose of this invention is to provide an environmentally friendly gas-insulated ring main unit with a three-position switch on the line side, to solve the problems of existing three-position switches on the line side being complex in structure and large in size in order to ensure insulation capacity and structural stability. Simultaneously, this invention also provides an environmentally friendly gas-insulated ring main unit that incorporates the aforementioned three-position switch into a circuit breaker module, thereby solving the same problem.

[0004] The three-position switch on the line side of the environmentally friendly gas-insulated ring main unit of this utility model adopts the following technical solution: The environmentally friendly gas-insulated ring main unit's line-side three-position switch includes a switch bracket, on which a circuit breaker module is fixedly mounted. The circuit breaker module includes three-phase solid-sealed poles cast as a single integral structure. The stationary ends of the three-phase solid-sealed poles form isolating stationary blades. An isolating main shaft is also mounted on the switch bracket. The isolating main shaft is rotatably mounted on the switch bracket along a rotation axis parallel to the arrangement direction of the three-phase solid-sealed poles. Isolating moving blades corresponding to the three-phase solid-sealed poles are mounted on the isolating main shaft. A grounding main conductor parallel to the isolating main shaft is also mounted on the switch bracket. Grounding stationary blades are set at positions corresponding to the isolating moving blades. Within the rotation stroke of the isolating main shaft, there are four positions: a grounding position where the isolating moving blade and the grounding stationary blade are combined; an open position where the isolating moving blade and the grounding stationary blade, as well as the isolating stationary blade, are separated; and a closed position where the isolating moving blade and the grounding stationary blade are combined.

[0005] Furthermore, the circuit breaker module includes a cast-in-place main beam, three-phase solid-sealed poles perpendicular to the main beam and evenly spaced along the length of the main beam, and transverse reinforcing ribs extending laterally between the main beam and the solid-sealed poles.

[0006] Furthermore, a circumferential reinforcing rib extending around the main crossbeam is provided on the side of the fixed end post, and the circumferential reinforcing rib intersects with the transverse reinforcing rib.

[0007] Furthermore, the switch bracket includes bracket side plates arranged opposite each other, and the two ends of the main crossbeam are fixedly connected to the bracket side plates at the corresponding ends.

[0008] Furthermore, each isolating stationary knife is equipped with a stationary knife shield. The opening of the stationary knife shield faces the closing rotation direction of the isolating moving knife to avoid the isolating moving knife. The stationary knife shield is integrally cast with the circuit breaker module and has metal shielding components cast inside.

[0009] Furthermore, the stationary knife shielding cover surrounds the stationary knife on three sides, enclosing it inside to ensure shielding between adjacent stationary knives.

[0010] Furthermore, the moving end of the back-isolation main shaft of the solid-sealed pole is equipped with a drive main shaft. The drive main shaft is connected to each moving end through a drive cam and drives the moving ends to open and close. The circuit breaker module also includes an integrally cast moving end shield. The moving end shield is set one-to-one with each moving end. The drive main shaft can rotate through the moving end shield. The drive cam is located inside each moving end shield. Metal shielding components are cast inside the moving end shield.

[0011] Furthermore, the moving end shield includes a pair of shielding plates arranged opposite each other in the transverse direction. The two sides of the shielding plates are inward to form a surrounding structure, and a clearance interval is formed between the two pairs of shielding plates to avoid the rotation of the drive cam.

[0012] Furthermore, the isolating blade is a clamp-type blade switch, and the back sides of the two opposing blades of the clamp-type blade switch are provided with smooth metal shields.

[0013] This utility model provides a novel three-position switch, which adopts a circuit breaker module in which all three phase solid-sealed poles are cast into an insulating shell to form an integral structure. This results in better overall integrity of the three phase solid-sealed poles, greater structural strength and rigidity, effective control of bounce, excellent short-circuit making capability, uniform and reliable switch electric field, improved insulation performance, and a compact overall structure with small size, which can reduce the overall size of the ring main unit.

[0014] The circuit breaker module of this utility model adopts the following technical solution: The circuit breaker module includes a cast-in-place main beam and three-phase solid-sealed poles cast as an integral structure with the main beam. The three-phase solid-sealed poles are perpendicular to the main beam and are evenly spaced along the length of the main beam. Both ends of the main beam are provided with connection structures for fixed connection with the switch bracket of the three-position switch.

[0015] Furthermore, transverse reinforcing ribs extending laterally are formed between the main crossbeam and the fixed end post.

[0016] Furthermore, a circumferential reinforcing rib extending around the main crossbeam is provided on the side of the fixed end post, and the circumferential reinforcing rib intersects with the transverse reinforcing rib.

[0017] Furthermore, each isolating stationary knife is equipped with a stationary knife shield. The opening of the stationary knife shield faces the closing rotation direction of the isolating moving knife to avoid the isolating moving knife. The stationary knife shield is integrally cast with the circuit breaker module and has metal shielding components cast inside.

[0018] Furthermore, the stationary knife shielding cover surrounds the stationary knife on three sides, enclosing it inside to ensure shielding between adjacent stationary knives.

[0019] Furthermore, the moving end of the solid-sealed pole is equipped with a drive spindle. The drive spindle is connected to each moving end through a drive cam and drives the moving end to open and close. The circuit breaker module also includes an integrally cast moving end shield. The moving end shield is set one-to-one with each moving end. The drive spindle can rotate through the moving end shield. The drive cam is located inside each moving end shield. Metal shielding components are cast inside the moving end shield.

[0020] Furthermore, the moving end shield includes a pair of shielding plates arranged opposite each other in the transverse direction. The two sides of the shielding plates are inward to form a surrounding structure, and a clearance interval is formed between the two pairs of shielding plates to avoid the rotation of the drive cam.

[0021] This utility model provides a novel circuit breaker module, which integrates three-phase solid-sealed poles into an insulating shell to form a single structure. This results in better overall integrity of the three-phase solid-sealed poles, greater structural strength and rigidity, effective control of bouncing, excellent short-circuit making capability, uniform and reliable switching electric field, improved insulation performance, and a compact overall structure with small size, which can reduce the overall size of the ring main unit.

[0022] The environmentally friendly gas-insulated ring main unit of this utility model adopts the following technical solution: An environmentally friendly gas-insulated ring main unit includes a cabinet and a line-side three-position switch installed inside the cabinet. The line-side three-position switch includes a switch bracket, on which a circuit breaker module is fixedly mounted. The circuit breaker module includes three-phase solid-sealed poles cast as a single integral structure. The stationary ends of the three-phase solid-sealed poles form isolating stationary blades. An isolating spindle is also mounted on the switch bracket. The isolating spindle is rotatably mounted on the switch bracket along a rotation axis parallel to the arrangement direction of the three-phase solid-sealed poles. Isolating moving blades corresponding to the three-phase solid-sealed poles are mounted on the isolating spindle. A grounding main conductor parallel to the isolating spindle is also mounted on the switch bracket. Grounding stationary blades are set at positions corresponding to the isolating moving blades. Within the rotation stroke of the isolating spindle, there are three positions: a grounding position where the isolating moving blade and the grounding stationary blade are combined; an open position where the isolating moving blade and the grounding stationary blade are separated; and a closed position where the isolating moving blade and the grounding stationary blade are combined.

[0023] Furthermore, the circuit breaker module includes a cast-in-place main beam, three-phase solid-sealed poles perpendicular to the main beam and evenly spaced along the length of the main beam, and transverse reinforcing ribs extending laterally between the main beam and the solid-sealed poles.

[0024] Furthermore, a circumferential reinforcing rib extending around the main crossbeam is provided on the side of the fixed end post, and the circumferential reinforcing rib intersects with the transverse reinforcing rib.

[0025] Furthermore, the switch bracket includes bracket side plates arranged opposite each other, and the two ends of the main crossbeam are fixedly connected to the bracket side plates at the corresponding ends.

[0026] Furthermore, each isolating stationary knife is equipped with a stationary knife shield. The opening of the stationary knife shield faces the closing rotation direction of the isolating moving knife to avoid the isolating moving knife. The stationary knife shield is integrally cast with the circuit breaker module and has metal shielding components cast inside.

[0027] Furthermore, the stationary knife shielding cover surrounds the stationary knife on three sides, enclosing it inside to ensure shielding between adjacent stationary knives.

[0028] Furthermore, the moving end of the back-isolation main shaft of the solid-sealed pole is equipped with a drive main shaft. The drive main shaft is connected to each moving end through a drive cam and drives the moving ends to open and close. The circuit breaker module also includes an integrally cast moving end shield. The moving end shield is set one-to-one with each moving end. The drive main shaft can rotate through the moving end shield. The drive cam is located inside each moving end shield. Metal shielding components are cast inside the moving end shield.

[0029] Furthermore, the moving end shield includes a pair of shielding plates arranged opposite each other in the transverse direction. The two sides of the shielding plates are inward to form a surrounding structure, and a clearance interval is formed between the two pairs of shielding plates to avoid the rotation of the drive cam.

[0030] Furthermore, the isolating blade is a clamp-type blade switch, and the back sides of the two opposing blades of the clamp-type blade switch are provided with smooth metal shields.

[0031] This utility model improves upon existing ring main units, particularly by employing a novel three-position switch. This three-position switch utilizes a circuit breaker module in which all three phase solid-sealed poles are cast into an insulating shell to form a single integrated structure. This results in better overall integrity of the three-phase solid-sealed poles, greater structural strength and rigidity, effective control of bounce, excellent short-circuit making capability, uniform and reliable switch electric field, improved insulation performance, and a compact overall structure with small size, thus reducing the overall size of the ring main unit. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the implementation method of the three-position switch on the line side of the environmentally friendly gas-insulated ring main unit of this utility model; Figure 2 for Figure 1 A schematic diagram of the circuit breaker module; Figure 3 for Figure 1 A schematic diagram of the structure of the central isolation spindle.

[0033] In the diagram: 1. Switch bracket; 2. Circuit breaker module; 20. Main crossbeam; 21. Circular reinforcing rib; 22. Transverse reinforcing rib; 23. Drive spindle; 24. Moving end shield; 25. Connecting screw hole; 26. Isolating stationary knife; 27. Stationary knife shield; 3. Isolating spindle; 30. Insulating skirt; 31. Reinforcing rib; 32. Isolating moving knife; 33. Metal shield; 40. Grounding main body; 41. Grounding stationary knife. Detailed Implementation

[0034] This utility model relates to an improvement of medium-voltage switchgear, specifically involving the research and application of improvements to a 12kV compact environmentally friendly gas-insulated ring main unit and a 1250A environmentally friendly gas-insulated ring main unit for switchyards. The improvement addresses the specific application requirements of this medium-voltage environmentally friendly gas-insulated ring main unit, where the line-side three-position switch needs to directly close the cable outgoing line short-circuit fault current via an isolating grounding switch, requiring rapid closing speed, and minimizing structural dimensions while ensuring electrical insulation requirements.

[0035] The present invention will be described below through different embodiments of the environmentally friendly gas-insulated ring main unit.

[0036] In one specific embodiment, the environmentally friendly gas-insulated ring main unit includes a cabinet, which is a gas-tight cabinet with an inner cavity for forming an environmentally friendly gas chamber. A line-side three-position switch is installed within this inner cavity. The line-side three-position switch includes a switch bracket, on which the main components constituting the three-position switch, namely a circuit breaker and an isolating grounding switch, are fixedly mounted. The entire three-position switch is then fixedly mounted to the cabinet as a whole via the switch bracket.

[0037] like Figure 1-3 As shown, the switch bracket 1 mainly includes two bracket side plates that are arranged at relative intervals. The main part of the three-position switch is bridged between the two bracket side plates, thus forming an integral frame structure together with the two bracket side plates, and the structure is relatively stable.

[0038] like Figure 1-2 As shown, the circuit breaker of the three-position switch on the line side has a modular structure, namely circuit breaker module 2. Circuit breaker module 2 includes a cast-in-place main beam 20 and three-phase solid-sealed poles cast integrally with the main beam 20. The three-phase solid-sealed poles are perpendicular to the main beam 20 and evenly spaced along the length of the main beam 20. (See diagram for details.) Figure 2 As shown, the main crossbeam 20 has a rectangular cross-sectional shape. The moving end and stationary end of the sealing pole are located on both sides of the thickness direction of the main crossbeam 20, respectively. A row of connecting screw holes 25 is provided at each end of the main crossbeam 20. The main crossbeam 20 is fixedly connected to the corresponding support side plate through the connecting screw holes 25 at both ends. Of course, in other embodiments, the cross-sectional shape of the main crossbeam 20 can also be other shapes, such as a regular hexagon, circle, or ellipse, etc., and the corresponding connecting screw holes 25 at the ends of the main crossbeam 20 can also be arranged in a ring or elliptical pattern.

[0039] To improve the overall structural strength and rigidity of circuit breaker module 2, enhance its impact resistance, and control switch bounce, transverse reinforcing ribs 22 are formed between the main crossbeam 20 and the fixed-phase poles. These transverse reinforcing ribs 22 are located on both sides of the main crossbeam 20 in the thickness direction and in the middle of the main crossbeam 20 in the width direction. The transverse reinforcing ribs 22 extend intermittently from one end of the main crossbeam 20 to the other, with the interruption points corresponding to the positions occupied by each fixed-phase pole. Adjacent fixed-phase poles are also connected by transverse reinforcing ribs 22. The transverse reinforcing ribs 22 improve the bonding strength between the main crossbeam 20 and each phase fixed-phase pole, as well as the bonding strength between adjacent fixed-phase poles.

[0040] More preferably, the main crossbeam 20 also has a circumferential reinforcing rib 21 extending around the main crossbeam 20 on the side of the sealing pole. The circumferential reinforcing rib 21 intersects with the transverse reinforcing rib 22, forming a cross-sectional reinforcing structure. Figure 2As shown, there are four reinforcing ribs 21 to ensure that each sealing pole has reinforcing ribs 21 on both sides in the transverse direction. The reinforcing ribs 21 shown in the figure surround three sides of the main crossbeam 20. In other embodiments, the reinforcing ribs 21 may also completely surround all four sides of the main crossbeam 20. In addition, reinforcing ribs are also provided on both sides in the width direction of the main crossbeam 20. The reinforcing ribs extend laterally and are arranged side by side in the thickness direction. The reinforcing ribs 21 also intersect with the reinforcing ribs.

[0041] The stationary end of the three-phase solid-sealed pole forms an isolating stationary blade 26, and the moving end of the three-phase solid-sealed pole is connected to a terminal for connecting to the main circuit. The isolating grounding switch includes an isolating main shaft 3 and a grounding stationary blade 41. The isolating main shaft 3 is rotatably mounted on the switch bracket 1 along a rotation axis parallel to the arrangement direction of the three-phase solid-sealed poles, and is located below the circuit breaker module 2 (within the direction of arrangement). Figure 1 , 2 (Taking the orientation shown as an example), the isolating main shaft 3 is equipped with isolating moving blades 32 corresponding one-to-one with the three-phase solid-sealed poles. The switch bracket 1 is also equipped with a grounding main body 40 parallel to the isolating main shaft 3. The grounding main body 40 is located beside the isolating main shaft 3, and grounding stationary blades 41 are provided on the grounding main body 40 at positions corresponding one-to-one with the isolating moving blades 32. Within the rotational stroke of the isolating main shaft 3, there are four positions: a contact position where the isolating moving blades 32 and grounding stationary blades 41 are engaged; an open position where the isolating moving blades 32, grounding stationary blades 41, and isolating stationary blade 26 are all separated; and a closed position where the isolating moving blades 32 and isolating stationary blades 26 are engaged.

[0042] like Figure 2 As shown, each isolating stationary blade 26 is equipped with a stationary blade shield 27. The opening of the stationary blade shield 27 faces the closing rotation direction of the isolating moving blade 32 to avoid the isolating moving blade 32. The stationary blade shield 27 is integrally cast with the circuit breaker module 2 and has a metal shielding component cast inside. As can be seen from the figure, the stationary blade shield 27 surrounds the isolating stationary blade 26 on three sides, enclosing the isolating stationary blade 26 inside. The two side walls of the stationary blade shield 27 are parallel to each other, so that the electric field between adjacent phases is uniform, thereby ensuring shielding between adjacent isolating stationary blades 26 and reducing the phase spacing.

[0043] The moving end of the back-isolation main shaft 3 of the solid-sealed pole is equipped with a drive main shaft 23. The drive main shaft 23 is connected to each moving end through a drive cam and drives the moving ends to open and close. The drive cam is a slotted cam, and the moving end has a drive pin that slides into the cam slot. When the drive cam is rotated by the drive main shaft 23, the drive pin slides in the cam slot. The transmission connection between the drive main shaft 23 and the moving end is existing technology and will not be described in detail here. The circuit breaker module 2 also includes an integrally cast moving end shield 24. The moving end shield 24 is set one-to-one with each moving end. The drive main shaft 23 rotatably passes through the moving end shield 24, and the drive cam is located inside each moving end shield 24. The moving end shield 24 is filled with a metal shield. Figure 1-2 As can be clearly seen, the moving end shield 24 includes a pair of shielding plates arranged opposite each other in the horizontal direction. The two sides of the shielding plates are rounded inward to form a surrounding structure. Each shielding plate is provided with a clearance hole, through which the drive shaft 23 passes and can rotate freely without interference. A clearance interval is formed between the pair of shielding plates to allow the drive cam to rotate. The opposing surfaces of the pair of shielding plates are arranged parallel to each other, so that the electric field between adjacent phases is uniform, thus ensuring shielding between adjacent drive cams and reducing the phase spacing.

[0044] The structure of the drive spindle 23 is as follows Figure 3 As shown, the device includes an injection-molded main shaft. Multiple insulating skirts 30, spaced apart along the length, are formed on the outer circumference of the main shaft. The insulating skirts 30 increase the creepage distance and improve electrical insulation performance. A moving blade arm extends radially outward from the main shaft. Reinforcing ribs 31 extending along the moving blade arm are formed on its outer side to improve the overall strength and rigidity of the moving blade arm. An isolating moving blade 32 is installed inside the moving blade arm. The isolating moving blade 32 is a clamp-type knife switch, with one end protruding from the end of the moving blade arm, forming an insertion space for the isolating stationary blade 26 and the grounding stationary blade 41 to enter. The isolating moving blade 32 extends along the length of the moving blade arm within it. The end of the isolating stationary blade 26 at the root of the moving blade arm has a terminal for connecting to the main circuit. Smooth metal shields 33 are provided on the back sides of the two opposing blades of the clamp-type knife switch to uniformly isolate the electric field at the moving blade 32, which helps to shorten the distance between the isolating blade and the gas box side plate.

[0045] In addition, the blade of the isolating moving blade 32 is a cold-pressed blade, specifically formed by cold extrusion in one step using a 1500T machine. This significantly increases the material density of the isolating moving blade 32, thereby increasing the conductivity of the copper blade. The hardness of the isolating moving blade 32 can reach 120HV, ensuring the short-circuit closing capability of the three-position switch.

[0046] The three-phase solid-sealed poles of circuit breaker module 2 are cast with epoxy resin to form an integral insulating shell, which has better dynamic and thermal stability than the insulating shell cast with ordinary PC material, and greatly improves the service life of the switch.

[0047] In the above embodiments, the outer surface of the main crossbeam is formed with transverse reinforcing ribs and circumferential reinforcing ribs, which intersect each other. In other embodiments, only transverse reinforcing ribs or only circumferential reinforcing ribs may be provided. In the above embodiments, the switch bracket includes two bracket side plates, and the circuit breaker module, drive spindle, and grounding main body are bridged between the two bracket side plates to form the entire three-position switch. In other embodiments, the switch bracket may include bracket side plates and connecting beams connecting the two bracket side plates, and the switch bracket forms a self-contained frame structure.

[0048] In the above embodiments, the stationary knife shield has a three-sided surrounding structure, and the two lateral shield walls are parallel to each other. In other embodiments, the stationary knife shield can be an arc-shaped shield. In the above embodiments, the moving end shield includes a pair of shielding plates. In other embodiments, the moving end shield can be a cylindrical structure, and a through-hole is provided on the cylindrical wall for the drive spindle to pass through.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. An environmentally friendly gas insulated ring main unit line side three-position switch, characterized in that, The circuit breaker module is fixedly mounted on the switch bracket. The circuit breaker module includes three-phase solid-sealed poles cast as a single integral structure. The stationary ends of the three-phase solid-sealed poles form isolation stationary blades. An isolation spindle is also mounted on the switch bracket. The isolation spindle is rotatably mounted on the switch bracket along a rotation axis parallel to the arrangement direction of the three-phase solid-sealed poles. Isolation moving blades corresponding to the three-phase solid-sealed poles are mounted on the isolation spindle. A grounding main body parallel to the isolation spindle is also mounted on the switch bracket. Grounding stationary blades are set at positions corresponding to the isolation moving blades. Within the rotation stroke of the isolation spindle, there are four positions: a grounding position where the isolation moving blade and the grounding stationary blade are combined; an open position where the isolation moving blade and the grounding stationary blade, as well as the isolation stationary blade, are separated; and a closed position where the isolation moving blade and the isolation stationary blade are combined.

2. The environmentally friendly gas insulated ring main unit line side three-position switch of claim 1, characterized in that, The circuit breaker module includes a cast-in-place main beam, three-phase solid-sealed poles perpendicular to the main beam and evenly spaced along the length of the main beam, and transverse reinforcing ribs extending laterally between the main beam and the solid-sealed poles.

3. The three-position switch on the line side of the environmentally friendly gas-insulated ring main unit according to claim 2, characterized in that, The main crossbeam is also provided with a circumferential reinforcing rib extending around the main crossbeam on the side of the fixed end post, and the circumferential reinforcing rib intersects with the transverse reinforcing rib.

4. The three-position switch on the line side of the environmentally friendly gas-insulated ring main unit according to claim 2, characterized in that, The switch bracket includes bracket side plates arranged opposite each other, and the two ends of the main crossbeam are fixedly connected to the bracket side plates at the corresponding ends.

5. The three-position switch on the line side of the environmentally friendly gas-insulated ring main unit according to any one of claims 1-4, characterized in that, Each isolating stationary knife is equipped with a stationary knife shield. The opening of the stationary knife shield faces the closing rotation direction of the isolating moving knife to avoid the isolating moving knife. The stationary knife shield is integrally cast with the circuit breaker module and has metal shielding components cast inside.

6. The three-position switch on the line side of the environmentally friendly gas-insulated ring main unit according to claim 5, characterized in that, The stationary knife shield surrounds the stationary knife on three sides, enclosing it inside to ensure shielding between adjacent stationary knives.

7. The three-position switch on the line side of the environmentally friendly gas-insulated ring main unit according to any one of claims 1-4, characterized in that, The moving end of the back-isolation main shaft of the solid-sealed pole is equipped with a drive main shaft. The drive main shaft is connected to each moving end through the drive cam and drives the moving end to open and close. The circuit breaker module also includes an integrally cast moving end shield. The moving end shield is set one-to-one with each moving end. The drive main shaft can rotate through the moving end shield. The drive cam is located inside each moving end shield. The moving end shield is filled with a metal shield.

8. The three-position switch on the line side of the environmentally friendly gas-insulated ring main unit according to claim 7, characterized in that, The moving end shield includes a pair of shielding plates arranged opposite each other in the transverse direction. The two sides of the shielding plates are inward to form a surrounding structure, and a clearance interval is formed between the two pairs of shielding plates to avoid the rotation of the drive cam.

9. The three-position switch on the line side of the environmentally friendly gas-insulated ring main unit according to any one of claims 1-4, characterized in that, The isolating knife switch is a clamp-type knife switch, and the back sides of the two opposite blades of the clamp-type knife switch are provided with smooth metal shields.

10. A circuit breaker module, characterized in that, It includes a cast-in-place main beam and three-phase solid-sealed poles cast as an integral structure with the main beam. The three-phase solid-sealed poles are perpendicular to the main beam and are evenly spaced along the length of the main beam. Both ends of the main beam are provided with connection structures for fixed connection with the switch bracket of the three-position switch.

11. The circuit breaker module according to claim 10, characterized in that, A transverse reinforcing rib is formed between the main beam and the fixed end post.

12. The circuit breaker module according to claim 11, characterized in that, The main crossbeam is also provided with a circumferential reinforcing rib extending around the main crossbeam on the side of the fixed end post, and the circumferential reinforcing rib intersects with the transverse reinforcing rib.

13. The circuit breaker module according to any one of claims 10-12, characterized in that, Each isolating stationary knife is equipped with a stationary knife shield. The opening of the stationary knife shield faces the closing rotation direction of the isolating moving knife to avoid the isolating moving knife. The stationary knife shield is integrally cast with the circuit breaker module and has metal shielding components cast inside.

14. The circuit breaker module according to claim 13, characterized in that, The stationary knife shield surrounds the stationary knife on three sides, enclosing it inside to ensure shielding between adjacent stationary knives.

15. The circuit breaker module according to any one of claims 10-12, characterized in that, The moving end of the solid-sealed pole is equipped with a drive spindle. The drive spindle is connected to each moving end through a drive cam and drives the moving end to open and close. The circuit breaker module also includes an integrally cast moving end shield. The moving end shield is set one-to-one with each moving end. The drive spindle can rotate through the moving end shield. The drive cam is located inside each moving end shield. Metal shielding components are cast inside the moving end shield.

16. The circuit breaker module according to claim 15, characterized in that, The moving end shield includes a pair of shielding plates arranged opposite each other in the transverse direction. The two sides of the shielding plates are inward to form a surrounding structure, and a clearance interval is formed between the two pairs of shielding plates to avoid the rotation of the drive cam.

17. An environmentally friendly gas-insulated ring main unit, comprising a cabinet and a three-position switch on the line side installed inside the cabinet, characterized in that, The line-side three-position switch is the environmentally friendly gas-insulated ring main unit line-side three-position switch as described in any one of claims 1-9.

Images