Circuit breaker and ring main unit

Abstract

The present application provides a circuit breaker (200) and a ring main unit (300). The circuit breaker (200) comprises pole bodies (1), movable end shielding seats (2), movable conductive rods (3), transmission crank arms (4), insulating pull rods (5), and crank arm shafts (6); a movable end of each pole body (1) is provided with a movable end shielding seat (2); two protruding columns (21) are formed on each movable end shielding seat (2); the two protruding columns (21) are each provided with a first connection hole (202); one end of each movable conductive rod (3) passes through the bottom of the corresponding movable end shielding seat (2) and extends into a vacuum arc-extinguishing chamber (101) of the pole body (1); each transmission crank arm (4) comprises a central portion (41) and a first end (42) and a second end (43) located at two ends of the central portion (41); the first end (42) of the transmission crank arm (4) is transmittingly connected to the other end of the corresponding movable conductive rod (3); each insulating pull rod (5) is connected to the second end (43) of the corresponding transmission crank arm (4); each crank arm shaft (6) passes through the central portion (41) of the corresponding transmission crank arm (4); the portions of two axial ends of the crank arm shaft (6) extending beyond outer sides of the transmission crank arm (4) are locked by connection members inserted into the two first connection holes (202) of the movable end shielding seat (2). In this way, damage to the uniformity of the pole bodies (1) caused by forming holes on the pole bodies (1) can be avoided, thereby enhancing the insulation performance and reliability of the circuit breaker (200).

Description

Circuit breakers and ring main units

[0001] This application claims priority to Chinese patent application No. 2024212209356, filed on May 30, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of switchgear, and mainly to a circuit breaker and a ring main unit. Background Technology

[0003] In switchgear, SF6 gas is commonly used for electrical insulation of switchgear due to its excellent insulation and arc-extinguishing properties. For example, SF6 gas is filled into the switchgear's gas chamber. However, SF6 is a greenhouse gas, and its use is detrimental to the environment. In existing technologies, dry air can be used directly as the insulating gas to produce more economical and environmentally friendly switchgear. However, air has lower insulation properties than SF6 gas, thus existing switchgear is limited by the insulation performance of air, resulting in a larger size and higher construction costs for air-insulated ring main units. In practical applications of switchgear, due to limited installation space, large air-insulated ring main units may not be widely adopted, while reducing the size of the ring main unit would result in it failing to meet insulation performance requirements. Summary of the Invention

[0004] This application provides a circuit breaker and a ring main unit, which can improve the insulation performance of the ring main unit.

[0005] The following technical solution is adopted in this disclosure:

[0006] According to one aspect of this application, a circuit breaker is provided, comprising a pole body, a moving end of the pole body having a moving end shielding seat, an opening at the bottom of the moving end shielding seat, two protrusions formed on the moving end shielding seat, each of the two protrusions having a first connecting hole located within a cavity enclosed by the moving end shielding seat; a moving conductive rod, one end of which passes through the opening and extends into the vacuum interrupter chamber of the pole body, and the moving conductive rod is capable of moving up and down within the opening; a transmission crank arm, the transmission crank arm including a middle portion and a first end and a second end located at both ends of the middle portion, the first end of the transmission crank arm being drively connected to the other end of the moving conductive rod to drive the moving conductive rod to move; an insulating pull rod connected to the second end of the transmission crank arm; and a crank arm shaft, the crank arm shaft passing through the middle portion of the transmission crank arm, the portions of the crank arm shaft extending axially to the outside of the transmission crank arm being locked by being inserted into the two first connecting holes of the moving end shielding seat via connectors.

[0007] According to another aspect of this application, a ring main unit is proposed, including a cabinet and a circuit breaker as described above disposed in the cabinet, wherein the terminal body of the circuit breaker is fixed to the cabinet.

[0008] This application discloses a circuit breaker and a ring main unit. The circuit breaker includes a pole body, a moving end shielding seat, a moving conductive rod, a transmission crank arm, an insulating tie rod, and a crank arm shaft. By providing a moving end shielding seat at the moving end of the pole body, the transmission connection structure between the moving conductive rod and the transmission crank arm is located within the cavity enclosed by the moving end shielding seat, thereby providing electrical isolation between the electrical connection point of the moving end of the pole body and the external environment, and achieving a uniform electric field. Furthermore, a protruding post is provided on the moving end shielding seat, and a first connecting hole is provided on the protruding post. The first connecting hole allows a connector to pass through so that the crank arm shaft is fixed to the moving end shielding seat. Compared with the conventional technology that requires process holes to be opened in the pole body for fixing the connecting pin of the transmission crank arm, the moving end transmission structure of the circuit breaker in this application avoids opening holes in the pole body, thus avoiding disruption of the pole body's consistency and reducing the likelihood of breakdown due to the location of the opening. This improves the insulation performance and reliability of the pole body, making the circuit breaker suitable for miniaturized ring main units and meeting their high insulation performance requirements. Attached Figure Description

[0009] The above and / or additional aspects and features of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0010] Figure 1 is a schematic diagram of the structure of a ring main unit according to some embodiments of this application;

[0011] Figure 2 is a perspective view of a circuit breaker according to some embodiments of this application;

[0012] Figure 3 is a magnified view of part A in Figure 2;

[0013] Figure 4 is a cross-sectional view of a circuit breaker according to some embodiments of this application;

[0014] Figure 5 is a magnified view of part B in Figure 4;

[0015] Figure 6 is a perspective view of the moving end shielding seat of some embodiments of this application.

[0016] Implementation of this disclosure

[0017] The embodiments of this application are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary.

[0018] To improve power supply reliability and allow users to obtain power from two directions, the power grid is typically connected in a ring, also known as a ring network power supply system. This power supply method is simply called ring power supply. The high-voltage switchgear used in a ring network power supply system is generally referred to as a ring main unit.

[0019] Traditional ring main units typically use SF6 gas insulation. While SF6 gas has excellent insulation and arc-quenching properties, it is a strong greenhouse gas, which is detrimental to environmental protection. Therefore, using air insulation in existing ring main units is more in line with the concept of green and environmentally friendly development.

[0020] Those skilled in the art will understand that the smaller the size of a ring main unit, the weaker its insulation. In particular, during the miniaturization design of ring main units that use dry air as the insulating gas, it is necessary to maintain the insulation performance of the unit while reducing its size.

[0021] Therefore, for small-sized ring main units, especially medium- and high-voltage ring main units, it is necessary to further improve the insulation performance within the cabinet. In particular, since the circuit breaker terminals are key structures in the switchgear responsible for current transmission and distribution, poor insulation performance can lead to excessively high electric field strength, causing partial discharge or breakdown. This application improves the insulation performance of the ring main unit by optimizing the electric field design of the transmission connection structure in the circuit breaker.

[0022] As shown in Figure 1, this application discloses a ring main unit (300). A circuit breaker 200 is installed inside the cabinet 100 of the ring main unit (300), and the pole body 1 of the circuit breaker 200 is fixed on the cabinet 100.

[0023] As shown in Figures 2 to 6, the circuit breaker 200 includes a pole body 1, a moving end shielding seat 2, a moving conductive rod 3, a transmission crank arm 4, an insulating pull rod 5, and a crank arm shaft 6.

[0024] As shown in Figure 4, the pole body 1 is provided with a vacuum interrupter 101, and the pole body 1 has a moving end and a stationary end.

[0025] The moving end of the pole body 1 is equipped with a moving conductive rod 3, and the stationary end of the pole body 1 is equipped with a stationary conductive rod that is connected and disconnected with the moving conductive rod 3. The ring main unit (300) is also equipped with a circuit breaker operating mechanism 210 for operating the circuit breaker 200. The circuit breaker operating mechanism 210 can drive the moving conductive rod 3 to move, thereby realizing the opening and closing functions of the circuit breaker 200.

[0026] As shown in Figures 2 and 6, the moving end of the pole body 1 is provided with a moving end shielding seat 2. The bottom of the moving end shielding seat 2 is provided with an opening 201. One end of the moving conductive rod 3 passes through the opening 201 and extends into the vacuum interrupter chamber 101 of the pole body 1. The moving conductive rod 3 can move up and down in the opening 201. In this way, the moving conductive rod 3 can engage or disengage with the stationary conductive rod located in the vacuum interrupter chamber 101 by moving up and down in the opening 201.

[0027] The other end of the moving conductive rod 3 is located inside the cavity 203 of the moving end shielding seat 2. The first end 42 of the transmission crank arm 4 is connected to the other end of the moving conductive rod 3 to drive the moving conductive rod 3 to move. By providing the moving end shielding seat 2 on the moving end of the pole body 1, the cavity 203 formed by the moving end shielding seat 2 can cover the transmission structure connecting the moving conductive rod 3 and the transmission crank arm 4, and electrically isolate the connection between the moving conductive rod 3 and the transmission crank arm 4, reducing the influence of the electric field on the electric field of adjacent phases.

[0028] Furthermore, the other end of the moving conductive rod 3 is provided with a first groove 301 with the opening facing upward.

[0029] The first transmission pin 7 passes through the first end 42 of the transmission crank arm 4 and is installed inside the moving conductive rod 3. The connecting cover plate 8 is placed over the first groove 301 and installed on the moving conductive rod 3. In this way, the first transmission pin 7 can be prevented from coming out of the first groove 301, so that the first transmission pin 7 is confined within the first groove 301.

[0030] As shown in Figures 3 and 5, the first transmission pin 7, which passes through the transmission crank arm 4, is first embedded into the other end of the moving conductive rod 3 through the first groove 301. Then, a connecting cover plate 8 is placed over the first groove 301 and installed on the other end of the moving conductive rod 3. The connecting cover plate 8 is positioned vertically opposite to the other end of the moving conductive rod 3, thus covering the opening of the first groove 301 and confining the first transmission pin 7 within the groove 301. When the transmission crank arm 4 is driven by the circuit breaker operating mechanism 210 to perform opening and closing operations, the first end 42 of the transmission crank arm 4 transmits power to the moving conductive rod 3 through the first transmission pin 7, thereby causing the moving conductive rod 3 to move up and down along the opening 201.

[0031] As shown in Figure 5, the movable conductive rod 3 is provided with two third connecting holes 302 located on the outside of the first groove 301. The openings of the third connecting holes 302 are set upwards, and the two third connecting holes 302 are arranged opposite to each other on both sides of the first groove 301. The two ends of the connecting cover plate 8 are respectively provided with fourth connecting holes corresponding to the third connecting holes 302, so that the connector 11 passes through the fourth connecting holes and the third connecting holes 302 to lock the connecting cover plate 8 and the movable conductive rod 3.

[0032] By providing a fourth connection hole on the connecting cover plate 8 and a corresponding third connection hole 302 on the other end of the moving conductive rod 3, it is possible to avoid drilling holes on the pole body 1 as connection holes, thus avoiding disruption of the consistency of the pole body 1, reducing potential breakdown points, and lowering the risk of breakdown due to the location of the opening 201, thereby improving the overall insulation performance of the circuit breaker 200.

[0033] In some embodiments, after the connector 11 passes through the fourth connecting hole of the connecting cover plate 8 and the third connecting hole 302 of the moving conductive rod 3 in sequence, the connecting cover plate 8 and the moving conductive rod 3 are locked together, thereby fixing the first end 42 of the transmission crank arm 4 to the moving conductive rod 3 by the first transmission pin 7. This connection method is simple, and the connecting cover plate 8 can cover the electrical connection between the moving conductive rod 3 and the transmission crank arm 4, which can reduce the exposed electrical connection parts. This reduces the problem of electric field concentration caused by the sharp point formed by the transmission connection with the transmission crank arm 4, and improves the insulation performance of the transmission connection structure of the pole body 1.

[0034] As shown in Figures 3 and 4, the first end 42 of the transmission crank arm 4 is provided with a second groove 401, and the other end of the moving conductive rod 3 and the connecting cover plate 8 are both embedded in the second groove 401. This makes the transmission connection structure between the moving conductive rod 3 and the transmission crank arm 4 more compact and stable, and also improves the exposure of the electrical connection between the moving conductive rod 3 and the transmission crank arm 4. Simultaneously, under the electrical isolation of the moving end shielding seat 2, the electric field distribution at the transmission connection between the moving conductive rod 3 and the transmission crank arm 4 can be effectively improved.

[0035] As shown in Figure 4, one end of the flexible connector 12 is connected to the moving end of the pole body 1 through the fixing member 13, and the other end of the flexible connector 12 is used to connect the conductive circuit. One end of the moving conductive rod 3 passes through the flexible connector 12 and extends into the interior of the pole body 1.

[0036] The movable conductive rod 3 passes through one end of the flexible connection 12 and extends into the vacuum interrupter 101 inside the pole body 1. A fixing member 13 is connected to the movable conductive rod 3, which fixes the flexible connection 12 to the movable end of the pole body 1. The other end of the flexible connection 12 extends upward through the opening at the top of the movable end shielding seat 2 and is connected to the conductive circuit.

[0037] As shown in Figure 3, the transmission crank arm 4 includes a middle part 41 and a first end 42 and a second end 43 located at both ends of the middle part 41. The first end 42 of the transmission crank arm 4 is connected to the other end of the moving conductive rod 3 to drive the moving conductive rod 3 to move. The second end 43 of the transmission crank arm 4 is connected to the insulating pull rod 5. The middle part 41 of the transmission crank arm 4 is fixed to the moving end shielding seat 2 by a crank arm shaft 6 passing through it.

[0038] Understandably, the middle part 41 of the transmission crank arm 4 forms the fulcrum of the lever, and the second end 43 of the transmission crank arm 4 is connected to the insulating pull rod 5. The second end 43 of the transmission crank arm 4 serves as the power input end. When the insulating pull rod 5 drives the transmission crank arm 4 to rotate around its middle part 41 under the drive of the circuit breaker operating mechanism 210, the force will be transmitted to the first end 42 through the transmission crank arm 4. The first end 42 of the transmission crank arm 4 serves as the power output end, which can drive the moving conductive rod 3 to move, thereby realizing the opening and closing functions of the circuit breaker 200.

[0039] An opening 204 is formed between the two shielding plates 23 in the moving end shielding seat 2, so that the transmission crank arm 4 can be connected to the moving conductive rod 3 through the part of the part of the transmission crank arm 4 that extends into the cavity 203 through the opening 204, which facilitates installation. Moreover, the connection part of the transmission crank arm 4 with the pole body 1 and the moving conductive rod 3 is located inside the cavity 203, which reduces the mutual influence of the electric fields of adjacent phases in the circuit breaker 200 and optimizes the electric field distribution.

[0040] As shown in Figure 3, the first end 42 of the transmission crank arm 4 is provided with a second groove 401. The first end 42 of the transmission crank arm 4 has a first side arm 411 and a second side arm 412 arranged opposite to each other. The second groove 401 is formed between the first side arm 411 and the second side arm 412. The other end of the moving conductive rod 3 and the connecting cover plate 8 are both embedded in the second groove 401. In this way, the other end of the moving conductive rod 3 and the connecting cover plate 8 are embedded in the second groove 401, and the first side arm 411, the second side arm 412 of the transmission crank arm 4, and the connecting cover plate 8 can wrap around the other end of the moving conductive rod 3, reducing the exposed electrical connection parts and further optimizing the electric field distribution on the moving end side of the pole body 1.

[0041] The first side arm 411 and the second side arm 412 are respectively provided with corresponding fifth connecting holes 402. The fifth connecting holes 402 are used for the first transmission pin 7 to pass through. The first transmission pin 7 is at least partially located in the second groove 401.

[0042] The middle part 41 of the transmission crank arm 4 is provided with a crank arm shaft 6. Two protrusions 21 are formed on the moving end shield seat 2. The two protrusions 21 are respectively provided with first connecting holes 202. The axial ends of the crank arm shaft 6 extending to the outside of the transmission crank arm 4 are inserted into the two first connecting holes 202 of the moving end shield seat 2 through the connector 11 and locked.

[0043] In this way, the transmission crank arm 4 and the moving end shield seat 2 are connected through the crank arm shaft 6 and the connector 11, instead of directly opening through holes or process holes on the pole body 1 for pin connection. This avoids drilling holes in the pole body 1, thereby maintaining the consistency of the pole body 1, effectively reducing potential insulation breakdown points, and improving the insulation performance of the pole body 1.

[0044] On the other hand, since there is no need to open through holes or process holes on the pole body 1, the manufacturing process of the circuit breaker 200 is simplified, and the assembly process of the circuit breaker 200 is also simpler, which is conducive to improving assembly efficiency.

[0045] The first connecting hole 202 is located inside the cavity 203 formed by the moving end shielding seat 2, so that the fixed connection point of the middle part 41 of the transmission crank arm 4 can be located inside the cavity 203. The moving end shielding seat 2 provides electrical isolation for the fixed connection end of the transmission crank arm 4, thereby improving the insulation level.

[0046] As shown in Figures 2 and 4, it also includes a second transmission pin 9, which passes through the second end 43 of the transmission crank arm 4. One end of the insulating pull rod 5 is connected to the transmission crank arm 4 through the second transmission pin 9, thereby forming a fixed connection between the second end 43 of the crank arm and the insulating pull rod 5.

[0047] The other end of the insulating pull rod 5 is connected to the input shaft 10, and the circuit breaker operating mechanism 210 is connected to the input shaft 10 to drive the moving conductive rod 3 of the pole body 1. The circuit breaker operating mechanism 210 can drive the input shaft 10 to rotate, thereby causing the insulating pull rod 5 connected to the input shaft 10 to move up and down. During this process, the second end 43 of the transmission crank arm 4, as the power input end, transmits force to the first end 42 of the transmission crank arm 4, thereby driving the first end 42 of the transmission crank arm 4 to move the moving conductive rod 3 up and down, realizing the connection and disconnection between the moving conductive rod 3 and the stationary conductive rod.

[0048] As shown in Figures 2 and 6, the moving end shielding seat 2 includes a connecting plate 22 and three shielding plates 23 extending upward from the connecting plate 22. The connecting plate 22 and the three shielding plates 23 enclose a cavity 203.

[0049] One of the shielding plates 23 is connected to one side of the other two shielding plates 23, and an opening 204 is formed between the other sides of the two shielding plates 23. The portion of the transmission crank arm 4 that extends into the cavity 203 through the opening 204 is connected to the moving conductive rod 3. In this way, the connection between the conductive rod and the transmission crank arm 4 can be installed in the moving end shielding seat 2, and the moving end shielding seat 2 can provide electrical isolation between the connection between the conductive rod and the transmission crank arm 4.

[0050] The connecting plate 22 is located on the moving end of the pole body 1. The connecting plate 22 is provided with an opening 201. The moving conductive rod 3 can extend into the vacuum interrupter chamber 101 of the pole body 1 through the opening 201 of the connecting plate 22, thereby connecting or disconnecting with the stationary conductive rod.

[0051] For example, the connecting plate 22 and the three shielding plates 23 together enclose the inner surface of the cavity 203 of the output end shielding seat 2. This inner surface can be configured as a metal surface. The metal surface has good conductivity and electromagnetic shielding effect, which can further optimize the electric field distribution at the connection between the conductive rod and the transmission crank arm 4 and improve the electrical performance of the circuit breaker 200.

[0052] In one embodiment, as shown in FIG6, the two protruding pillars 21 are located at the openings 204 formed by the two shielding plates 23.

[0053] In another embodiment, as shown in FIG2, a baffle 24 is also provided at the opening 204 formed by the two shielding plates 23, and the two protruding posts 21 are arranged adjacent to the baffle 24 and located inside the baffle 24.

[0054] As shown in Figure 6, the two protrusions 21 are located inside the cavity 203. The two ends of the crank arm shaft 6 are respectively provided with second connecting holes 601. The first connecting hole 202 is provided in correspondence with the second connecting hole 601, so that the connector 11 can be inserted from above into the second connecting hole 601 and the first connecting hole 202 to lock the crank arm shaft 6 and the protrusions 21.

[0055] In this way, the crank arm shaft 6 is fixedly connected to the protrusion 21, and the middle part 41 of the transmission crank arm 4 is provided with a through hole for the crank arm shaft 6 to pass through. Under the drive of the insulating pull rod 5, the transmission crank arm 4 can rotate relative to the crank arm shaft 6.

[0056] The first connecting hole 202 of the protruding post 21 is set upward, and the two ends of the crank arm shaft 6 are provided with through holes, so that the connecting piece 11 can lock the crank arm shaft 6 and the protruding post 21 by inserting the second connecting hole 601 and the first connecting hole 202 from above. This connection method not only enhances the connection stability between the crank arm shaft 6 and the moving end shielding seat 2, but also simplifies the connection structure at the fixed support point of the transmission crank arm 4 and the assembly process of the transmission crank arm 4.

[0057] In summary, the circuit breaker 200 disclosed in this application has a moving end shielding seat 2 at one end of the moving conductive rod 3. The moving end shielding seat 2 can cover the connection structure between the moving conductive rod 3 and the transmission crank arm 4 of the pole body 1, thereby better isolating the electrical connection of the pole body 1 from the external environment and playing a role in uniform electric field. Furthermore, by providing a protruding post 21 on the moving end shielding seat 2, and the first connecting hole 202 provided on the protruding post 21, the connecting piece 11 can pass through to fix the crank arm shaft 6 on the moving end shielding seat 2. Compared with the traditional technology that requires opening process holes in the pole body 1 to fix the connecting pin of the transmission crank arm 4, the moving end transmission structure of the circuit breaker 200 of this application avoids opening holes in the pole body 1 and thus avoids disrupting the consistency of the pole body 1, reducing the possibility of breakdown due to the opening position. This improves the insulation performance and reliability of the pole body 1, making the circuit breaker 200 suitable for miniaturized ring main units (300) and meeting their high insulation performance requirements. It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solutions and utility model concepts of this disclosure, and all such substitutions or changes should fall within the protection scope of this disclosure.

Claims

1. A circuit breaker comprising: a pole body, a moving end of the pole body being provided with a moving end shield seat, a bottom of the moving end shield seat being provided with an opening, two protruding columns being formed on the moving end shield seat, and first connecting holes being respectively provided on the two protruding columns and located in a cavity surrounded by the moving end shield seat; a moving conducting rod, one end of the moving conducting rod penetrating through the opening and extending into a vacuum arc-extinguishing chamber of the pole body, and the moving conducting rod being capable of moving up and down in the opening; a transmission crank, the transmission crank comprising a middle part and first and second ends located at two ends of the middle part, the first end of the transmission crank being in transmission connection with the other end of the moving conducting rod to drive the moving conducting rod to act; an insulating pull rod connected with the second end of the transmission crank; and a crank shaft, the crank shaft being arranged in the middle part of the transmission crank, and portions of the crank shaft extending to the outside of the transmission crank being inserted into the first connecting holes of the moving end shield seat through connecting members to lock the crank shaft. 2.The circuit breaker according to claim 1, wherein the moving end shield seat comprises a connecting plate located on the moving end of the pole body and three shield plates upwardly extending from the connecting plate, the connecting plate being provided with the opening, and the connecting plate and the shield plates surrounding the cavity, one of the shield plates being connected with one side of the other two shield plates, and an opening being formed between the other sides of the two shield plates, the transmission crank being in transmission connection with the moving conducting rod through the portion of the transmission crank extending into the cavity through the opening. 3.The circuit breaker according to claim 2, wherein the two protruding columns are located in the cavity, second connecting holes are respectively provided at the axial ends of the crank shaft, and the first connecting holes and the second connecting holes are correspondingly arranged to allow the connecting members to be inserted into the second connecting holes and the first connecting holes from above to lock the crank shaft and the protruding columns. 4.The circuit breaker according to any one of claims 1 to 3, further comprising a first transmission pin and a connecting cover plate, the first transmission pin being arranged through the first end of the transmission crank, the other end of the moving conducting rod being provided with a first recess with an upward opening, the first transmission pin being arranged in the moving conducting rod through the first recess, and the connecting cover plate being arranged above the first recess and connected with the moving conducting rod to limit the first transmission pin in the first recess. 5.The circuit breaker according to claim 4, wherein the moving conducting rod is provided with two third connecting holes located outside the first recess, the third connecting holes being upwardly open, the two third connecting holes being oppositely arranged on the two sides of the first recess, and the connecting cover plate being provided with fourth connecting holes correspondingly to the third connecting holes at the two ends of the connecting cover plate to allow the connecting members to be inserted into the fourth connecting holes and the third connecting holes to lock the connecting cover plate and the moving conducting rod. 6.The circuit breaker according to claim 4, wherein ​ ​ The first end of the transmission crank arm is provided with a second groove, the first end of the transmission crank arm is provided with a first side arm and a second side arm arranged oppositely, the second groove is formed between the first side arm and the second side arm, and the other end of the movable conducting rod and the connecting cover plate are both embedded in the second groove. The first side arm and the second side arm are respectively provided with corresponding fifth connecting holes, the fifth connecting holes are used for allowing the first transmission pin to pass through, and the first transmission pin is at least partially located in the second groove.

7. The circuit breaker of claim 4, wherein, The soft connection is further provided, one end of the soft connection is connected with the movable end of the pole body through a fixing member, the other end of the soft connection is used for connecting a conducting loop, and one end of the movable conducting rod is inserted into the interior of the pole body through the part of the soft connection.

8. The circuit breaker of any one of claims 1 to 3, wherein, The second transmission pin is further provided, the second transmission pin is penetrated on the second end of the transmission crank arm, and one end of the insulating pull rod is connected with the transmission crank arm through the second transmission pin.

9. The circuit breaker of claim 8, wherein, The input shaft is further provided, the other end of the insulating pull rod is connected with the input shaft; and The circuit breaker operating mechanism is further provided, the circuit breaker operating mechanism is connected with the input shaft to drive the movable conducting rod of the pole body to act.

10. A ring main unit, comprising a cabinet body and the circuit breaker as claimed in any one of claims 1 to 9 arranged in the cabinet body, and the pole body of the circuit breaker is fixed on the cabinet body.

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