An electronic trip unit for a reclosing circuit breaker

Abstract

The utility model relates to an electronic tripping mechanism of reclosing circuit breaker, including the electronic tripping assembly and operating mechanism subassembly installed in circuit breaker, electronic tripping assembly includes support, apron, outer compression spring, push rod, moving iron core, static iron core, baffle and permanent magnet, static iron core, baffle and permanent magnet array connection are established on support, and moving iron core and inner compression spring are inserted into apron, and the outer pipe body of push rod is covered in the outside of apron, and the inner pipe body of push rod is inserted into apron and is covered on the rear end of moving iron core, and outer compression spring is covered in push rod and is connected between apron and the outer pipe body of push rod, operating mechanism subassembly is connected between the switching handle of circuit breaker and push rod and carries out the cooperation transmission, has realized the elastic energy storage type structure design of using outer compression spring when again buckling, and pushes static iron core and permanent magnet array connection and moving iron core attraction, makes the structure design of electronic tripping assembly more compact, and the volume is small, and the outer compression spring releases the energy storage when tripping, has sufficient tripping power, and tripping action is reliable.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to an electronic tripping mechanism for a reclosing circuit breaker. Background Technology

[0002] A circuit breaker is a power distribution device used in a power grid. It can connect, carry, and disconnect current under normal circuit conditions, and also connect, carry, and disconnect current for a certain time under specified abnormal conditions, such as overload, short circuit, leakage, undervoltage, and single-phase grounding faults. With the development of the power industry, the operating mechanism of molded case circuit breakers has gradually become the mainstream of current development, with designs moving towards miniaturization and intelligence. Automatic reclosing mechanisms are specialized accessories for molded case circuit breakers. When used with the circuit breaker, they can remotely and electrically close, open, and re-tie the circuit breaker to achieve centralized and automatic control of the transmission and distribution network. The existing electronic tripping mechanism in reclosing residual current protection circuit breakers has an unreasonable structural design, occupies a large amount of internal space, and is difficult to install modularly. This results in poor versatility of the existing electronic tripping mechanism for circuit breakers with different internal structures, making modular assembly impossible in different circuit breakers. Therefore, designing an electronic tripping mechanism for reclosing circuit breakers that allows for a compact tripping assembly and reliable tripping action has become an urgent technical problem to be solved. Summary of the Invention

[0003] To solve the above problems, this utility model provides an electronic tripping mechanism for a reclosing circuit breaker.

[0004] The technical solution of this utility model is an electronic tripping mechanism for a reclosing circuit breaker, comprising an electronic tripping assembly and an operating mechanism assembly installed inside the circuit breaker. The electronic tripping assembly includes a coil frame, a bracket, a cover plate, an outer pressure spring, a push rod, a moving iron core, an inner pressure spring, and a stationary iron core. The bracket is fixedly connected to the front and left and right sides of the coil frame. A partition and a permanent magnet are provided on the front side of the coil frame. A coil is nested in the outer wall of the coil frame. The stationary iron core, the partition, and the permanent magnet pass through the inside of the coil frame and are arranged from back to front. The circuit breaker is connected to the bracket, and the rear side of the bracket is provided with a riveting boss for riveting to the cover plate. The moving iron core and the inner pressure spring pass through the cover plate. The push rod has a double tube structure. The outer tube of the push rod is sleeved on the outside of the cover plate, and the inner tube of the push rod passes through the cover plate and is sleeved on the rear end of the moving iron core. The outer pressure spring is sleeved on the outside of the push rod and is connected between the cover plate and the outer tube of the push rod. The inner pressure spring is sleeved on the rear end of the moving iron core and is connected between the inner tube of the push rod and the moving iron core. The operating mechanism assembly is connected between the circuit breaker's opening and closing handle and the push rod for transmission.

[0005] With the above structure, when the circuit breaker is in the re-clamping state, the circuit breaker's opening and closing handle will drive the operating mechanism assembly to move towards the electronic tripping assembly. The operating mechanism assembly will press against the push rod of the electronic tripping assembly, causing the external pressure spring to compress along its set direction. The push rod moves into the cover plate, and through the elastic transmission between the push rod and the moving iron core by the internal pressure spring, it pushes the moving iron core closer to the stationary iron core and the permanent magnet, relying on magnetic force to achieve attraction and complete the circuit breaker's closing. When the circuit breaker experiences a fault current, the electronic tripping assembly receives the tripping unlocking command current issued by the circuit breaker, and the line... When the coil is energized, it overcomes the magnetic force that the moving iron core was originally subjected to. Under the elastic force of the external pressure spring, the moving iron core is pushed, and the attraction between the moving iron core, the stationary iron core, and the permanent magnet is released, so that the push rod and the moving iron core return to the state before re-clamping, completing the tripping and power disconnection of the circuit breaker. The elastic energy storage structure design of the external pressure spring is used to push the stationary iron core and the permanent magnet to connect and attract the moving iron core during re-clamping. This makes the structure design of the electronic tripping assembly more compact and smaller in size, and does not occupy a lot of space in the circuit breaker. During tripping, the external pressure spring quickly releases the stored energy, which has sufficient tripping power and reliable tripping action.

[0006] As a further improvement of this utility model, the operating mechanism assembly includes a lever, a rocker arm, a traction rod, and a pair of clamps. The clamps are arranged on the left and right sides of the operating mechanism assembly and fixed inside the circuit breaker. A first rivet shaft and a second rivet shaft are axially connected between the clamps. The lever and the traction rod are axially connected to the clamps. The top of the lever is connected to the circuit breaker's opening and closing handle for linkage. The rocker arm is connected to the second rivet shaft. A torsion spring is sleeved on the first rivet shaft. The front side of the lever is provided with a lever push rod aligned with the rear side of the rocker arm. The front side of the rocker arm is aligned with the rear side of the traction rod, and there is a free travel gap between them. The front side of the traction rod is attached to the rear side of the push rod. The torsion spring has a short torsion spring leg connected to the rocker arm and a long torsion spring leg connected to the traction rod.

[0007] With the above structure, when the circuit breaker is re-clamped, as the opening and closing handle is pulled, the lever rotates forward around the bottom pivot joint. The lever push rod on the lever moves forward, pushing the rocker arm. The rocker arm rotates forward around the second rivet shaft. The front side of the rocker arm passes through the empty travel gap and approaches the rear side of the traction rod. The rotation of the rocker arm also drives the short leg of the torsion spring. Through the torsion spring transmission, it drives the long leg of the torsion spring to rotate forward and downward. The long leg of the torsion spring pulls the traction rod, causing it to rotate backward and downward. This causes the rocker arm, passing through the empty travel gap, to abut against the traction rod, and the torsion spring... Under the elastic pull, it remains in a contact state. As the rocker arm pushes the traction rod to rotate forward around the rivet shaft, the traction rod pushes the push rod to move the moving iron core and attract it to the stationary iron core. At the same time, the torsion spring further twists and accumulates elastic force. When a trip occurs, the opening and closing handle trips and moves in the opposite direction, causing the lever to reverse and return to its original position. At this time, the rocker arm loses the push of the lever push rod, and the torsion spring releases the accumulated elastic force, pushing the rocker arm and the traction rod to reverse and separate. Combined with the external pressure spring, the push rod pushes the traction rod backward, causing the rocker arm and the traction rod to return to their original positions.

[0008] As a further improvement of this utility model, the rear side of the rocker arm is provided with a feature surface one for aligning with the lever push rod, the front side of the traction rod is provided with a feature surface two, and the rear side of the push rod is provided with a feature surface three for aligning with feature surface two; the bottom of the rocker arm is provided with a limiting groove one and a boss, the rear side of the traction rod is provided with a limiting groove two, the short leg of the torsion spring is inserted into the limiting groove one for limiting engagement, the long leg of the torsion spring is inserted into the limiting groove two for limiting engagement, and the position of the boss corresponds to the short leg of the torsion spring; the traction rod is provided with a groove located on the rear side of feature surface two, and the front side of the rocker arm is aligned with the groove.

[0009] With the above structure, the lever push rod pushes forward against the first feature surface of the rocker arm, and the second feature surface of the traction rod pushes forward against the third feature surface of the push rod. When the circuit breaker is re-clamped, the feature surfaces form a stable contact transmission, making the linkage between the operating mechanism assembly and the electronic tripping assembly more stable. The front side of the rocker arm is aligned with the groove, which is located on the rear side of the second feature surface. The rocker arm inserts into the groove while passing through the free travel gap, and finally passes forward through the groove and pushes forward against the traction rod. The left and right side walls of the groove can limit the rocker arm and prevent the front position of the rocker arm from shifting to the side. When the circuit breaker is in the re-clamping state, the boss presses down on the short leg of the torsion spring. When the circuit breaker is in the tripping state, the boss is pushed by the reaction force of the torsion spring, causing the rocker arm to reverse and reset.

[0010] As a further improvement of this utility model, the clamping plate is provided with mounting hole one and mounting hole two, the rocker arm is provided with riveting shaft hole, the riveting shaft two passes through the riveting shaft hole and its end is riveted to mounting hole one, and the end of the riveting shaft one is riveted to mounting hole two; the clamping plate is provided with limiting surface one and limiting surface two, one end of limiting surface one and limiting surface two are connected to form a limiting angle, the rocker arm is provided with a protrusion extending into the limiting angle, there is a stroke interval between the protrusion and limiting surface one or limiting surface two, the protrusion is provided with a limiting surface one facing the limiting surface one and a limiting surface two facing the limiting surface two.

[0011] With the above structure, when the circuit breaker is tripped, there is a travel interval between the protrusion and the second limiting surface. When the circuit breaker is re-clamped, the first limiting surface on the protrusion, which was originally in contact with the first limiting surface, separates from the first limiting surface. As the rocker arm moves forward, it pushes the traction rod. After the moving iron core and the stationary iron core are attracted together, the second limiting surface of the protrusion and the second limiting surface are in contact. The first limiting surface and the second limiting surface limit the rotation angle of the rocker arm, preventing the rocker arm from excessively deviating when it is pushed forward by the lever push rod or when the release of the elastic force pushes the rocker arm backward to reset. This maintains the transmission coordination accuracy between the lever, rocker arm, and traction rod, and further improves the reliability of the tripping and re-clamping actions.

[0012] As a further improvement of this utility model, it also includes a housing fixed inside the circuit breaker, and an electronic tripping assembly installed inside the housing; the housing includes an upper shell, a lower shell, and a fixing member; the lower shell is provided with a cavity for inserting the electronic tripping assembly, a compression spring and a push rod extend from the rear side of the cavity, and the bracket is provided with grooves on the top of the left and right sides; the upper shell is fastened to the lower shell and is provided with a boss that fits into the groove; the upper shell and the lower shell are provided with a corresponding connecting hole one and a connecting hole two, and the fixing member passes through the connecting hole one and the connecting hole two for threaded connection.

[0013] With the above structure, the electronic tripping assembly is housed in the cavity, and the upper shell is fastened to the lower shell to limit the electronic tripping assembly within the cavity. The external pressure spring and push rod of the electronic tripping assembly extend from the rear side of the cavity and work in conjunction with the operating mechanism assembly. By fixing the housing inside the circuit breaker, the housing has a simpler and neater shape, making it easy to install in circuit breakers with different internal spaces. This allows for more flexible placement of the electronic tripping assembly and strong versatility. Attached Figure Description

[0014] Figure 1 The diagram shown is a structural schematic of this utility model.

[0015] Figure 2 The diagram shown is a cross-sectional view of the electronic tripping assembly.

[0016] Figure 3 The diagram shows the assembly state of the housing and the electronic tripping assembly.

[0017] Figure 4 The diagram shows the disassembled structure of the upper and lower shells.

[0018] Figure 5 The diagram shown is a schematic of the rear structure of the traction rod.

[0019] Figure 6 The diagram shown is a schematic of the clamping plate structure.

[0020] Figure 7 The diagram shown is a schematic of the rocker arm structure.

[0021] 1-Electronic tripping assembly; 11-Coil frame; 12-Coil; 13-Bracket; 131-Groove B; 132-Riveting boss; 14-Cover plate; 15-Outer pressure spring; 16-Push rod; 161-Feature surface three; 17-Moving iron core; 18-Inner pressure spring; 19-Stationary iron core; 110-Blocking plate; 111-Permanent magnet. 2-Operating mechanism components, 21-Lever, 211-Lever push rod, 22-Rivet shaft one, 23-Rock arm, 231-Rock arm push rod, 232-Limiting groove one, 233-Rivet shaft hole, 234-Restricted surface one, 235-Restricted surface two, 236-Boss A, 237-Feature surface one, 24-Torsion spring, 241-Torsion spring short leg, 242-Torsion spring long leg, 25-Rivet shaft two, 26-Traction rod, 261-Feature surface two, 262-Groove A, 263-Limiting groove two, 27-Clamping plate, 271-Limiting surface one, 272-Limiting surface two, 273-Mounting hole one, 274-Mounting hole two 3-Shell shell, 31-Upper shell, 311-Connecting hole one, 312-Boss B, 32-Lower shell, 321-Connecting hole two 322 - Cavity, 33 - Fixing element. Detailed Implementation

[0022] like Figures 1-7 The electronic tripping mechanism of a reclosing circuit breaker shown includes an electronic tripping assembly 1 and an operating mechanism assembly 2 installed inside the circuit breaker. The electronic tripping assembly 1 includes a coil frame 11, a bracket 13, a cover plate 14, an external pressure spring 15, a push rod 16, a moving iron core 17, an internal pressure spring 18, and a stationary iron core 19. The bracket 13 is fixedly connected to the front and left and right sides of the coil frame 11. The front side of the coil frame 11 is provided with a partition plate 110 and a permanent magnet 111. A coil 12 is nested in the outer wall of the coil frame 11. The stationary iron core 19, the partition plate 110, and the permanent magnet 111 pass through the interior of the coil frame 11 and are arranged from back to front to connect to the bracket. On the frame 13, the rear side of the bracket 13 is provided with a riveting boss 132 that is riveted to the cover plate 14. The moving iron core 17 and the inner pressure spring 18 are inserted into the cover plate 14. The push rod 16 has a double tube structure. The outer tube of the push rod 16 is sleeved on the outside of the cover plate 14, and the inner tube of the push rod 16 is inserted into the cover plate 14 and sleeved on the rear end of the moving iron core 17. The outer pressure spring 15 is sleeved on the outside of the push rod 16 and connected between the cover plate 14 and the outer tube of the push rod 16. The inner pressure spring 18 is sleeved on the rear end of the moving iron core 17 and connected between the inner tube of the push rod 16 and the moving iron core 17. The operating mechanism assembly 2 is connected between the circuit breaker's opening and closing handle and the push rod 16 for linkage.

[0023] When the circuit breaker is in the re-clamping state, the circuit breaker's opening and closing handle will drive the operating mechanism assembly 2 to move towards the electronic tripping assembly 1. The operating mechanism assembly 2 will press against the push rod 16 of the electronic tripping assembly 1, causing the outer pressure spring 15 to compress along its set direction. The push rod 16 moves into the cover plate 14, and through the elastic transmission between the push rod 16 and the moving iron core 17 via the inner pressure spring 18, it pushes the moving iron core 17 closer to the stationary iron core 19 and the permanent magnet 111, relying on magnetic force to achieve attraction and complete the circuit breaker's closing. When the circuit breaker experiences a fault current, the electronic tripping assembly 1 receives the tripping unlocking command current issued by the circuit breaker, and the coil 12 is energized to overcome the moving iron core 19. The magnetic force initially applied to the 7th element is pushed by the restoring elastic force of the external pressure spring 15, causing the attraction between the moving iron core 17, the stationary iron core 19, and the permanent magnet 111 to be released. This returns the push rod 16 and the moving iron core 17 to their pre-re-clamping state, completing the tripping and power-off of the circuit breaker. During re-clamping, the elastic energy storage structure of the external pressure spring 15 is used to push the stationary iron core 19 and the permanent magnet 111 to connect and attract the moving iron core 17. This makes the structure of the electronic tripping assembly 1 more compact and smaller in size, without occupying a large amount of space inside the circuit breaker. During tripping, the external pressure spring 15 quickly releases its stored energy, providing sufficient tripping power and ensuring reliable tripping action, unaffected by its small size.

[0024] The operating mechanism assembly 2 includes a lever 21, a rocker arm 23, a traction rod 26, and a pair of clamping plates 27. The clamping plates 27 are located on the left and right sides of the operating mechanism assembly 2 and fixed inside the circuit breaker. A first rivet shaft 22 and a second rivet shaft 25 are axially connected between the clamping plates 27. The bottom of the lever 21 and the top of the traction rod 26 are axially connected to the clamping plates 27. The top of the lever 21 is connected to the circuit breaker's opening and closing handle for linkage. The bottom of the rocker arm 23 is connected to the second rivet shaft 25. A rivet 22 is positioned below the rocker arm 23 and the traction rod 26. A torsion spring 24 is fitted on the rivet 22. A lever push rod 211 is provided on the front side of the lever 21, which is aligned with the rear side of the rocker arm 23. The front side of the rocker arm 23 is aligned with the rear side of the traction rod 26, and there is a free travel gap between the two. The front side of the traction rod 26 is attached to the rear side of the push rod 16. The torsion spring 24 has a short torsion spring leg 241 connected to the rocker arm 23 and a long torsion spring leg 242 connected to the traction rod 26.

[0025] When the circuit breaker is re-clamped, as the opening and closing handle is pulled, lever 21 rotates forward around the bottom pivot joint. Lever push rod 211 on lever 21 moves forward, pushing rocker arm 23. Rocker arm 23 rotates forward around riveting shaft 25. The front side of rocker arm 23 passes through the free travel gap and approaches the rear side of traction rod 26. The rotation of rocker arm 23 also drives the short leg 241 of torsion spring, which, through torsion spring 24, drives the long leg 242 of torsion spring to rotate forward and downward. The long leg 242 of torsion spring pulls traction rod 26, causing it to rotate backward and downward. This causes rocker arm 23, passing through the free travel gap, to abut against traction rod 26, and under the elastic pull of torsion spring 24... While maintaining contact, as the rocker arm 23 pushes the traction rod 26 to rotate forward around the rivet shaft 22, the traction rod 26 pushes the push rod 16 to move the moving iron core 17 and engage with the stationary iron core 19. At the same time, the torsion spring 24 further twists and accumulates elastic force. When tripping occurs, the trip handle moves in the reverse direction, causing the lever 21 to reverse back to its original position. At this time, the rocker arm 23 loses the push of the lever push rod 211, and the torsion spring 24 releases the accumulated elastic force, pushing the rocker arm 23 and the traction rod 26 to reverse and separate. Combined with the external pressure spring 15, the push rod 16 pushes the traction rod 26 backward, causing the rocker arm 23 and the traction rod 26 to return to their original positions.

[0026] The rocker arm 23 has a feature surface 237 on the rear side that aligns with the lever push rod 211. The traction rod 26 includes a feature surface 261 on the front side. The push rod 16 has a feature surface 161 on the rear side that aligns with the feature surface 261. The bottom of the rocker arm 23 has a limiting groove 232 and a boss A236. The rear side of the traction rod has a limiting groove 263. The short leg 241 of the torsion spring is inserted into the limiting groove 232 for limiting engagement. The long leg 242 of the torsion spring is inserted into the limiting groove 263 for limiting engagement. The position of the boss A236 corresponds to the short leg 241 of the torsion spring. The traction rod has a groove A262 on the rear side of the feature surface 261. The front side of the rocker arm 23 is aligned with the groove A262.

[0027] The lever push rod 211 pushes forward against the feature surface 237 of the rocker arm 23, and the feature surface 261 of the traction rod 26 pushes forward against the feature surface 161 of the push rod 16. When the circuit breaker is re-clamped, the feature surfaces form a stable contact transmission, making the linkage between the operating mechanism assembly 2 and the electronic tripping assembly 1 more stable. The front side of the rocker arm 23 is aligned with the groove A262, which is located behind the feature surface 261. The rocker arm 23 is inserted into the groove A262 while passing through the empty travel gap, and finally passes forward through the groove A262 and pushes forward against the traction rod 26. The left and right side walls of the groove A262 can limit the rocker arm 23 and prevent the front position of the rocker arm 23 from shifting to the side. When the circuit breaker is in the re-clamping state, the boss A236 presses against the torsion spring short leg 241. When the circuit breaker is in the tripping state, the boss A236 is pushed by the reaction force of the torsion spring 24, so that the rocker arm 23 reverses and resets.

[0028] The clamping plate 27 is provided with mounting hole 1 273 and mounting hole 274. The rocker arm 23 is provided with riveting shaft hole 233. Riveting shaft 25 passes through riveting shaft hole 233 and its end is riveted to mounting hole 1 273. The end of riveting shaft 22 is riveted to mounting hole 274. The clamping plate 27 is provided with limiting surface 1 271 and limiting surface 272. One end of limiting surface 1 271 and limiting surface 272 are connected to form a limiting angle. The rocker arm 23 is provided with a protrusion that extends into the limiting angle. When the circuit breaker is tripped, there is a travel interval between the protrusion and limiting surface 272. The protrusion is provided with limiting surface 1 234 facing limiting surface 1 271 and limiting surface 235 facing limiting surface 272.

[0029] When the circuit breaker is in the tripped state, there is a travel interval between the protrusion and the second limiting surface 272. When the circuit breaker is re-tripped, the first limiting surface 234 on the protrusion, which was originally in contact with the first limiting surface 271, separates from the first limiting surface 271. As the rocker arm 23 moves forward, it pushes the traction rod 26. After the moving iron core 17 and the stationary iron core 19 are attracted together, the second limiting surface 235 of the protrusion and the second limiting surface 272 are in contact. The first limiting surface 271 and the second limiting surface 272 limit the rotation angle of the rocker arm 23, so as to avoid excessive deviation of the rocker arm 23 when it is pushed forward by the lever push rod 211 or when the spring force is released to push the rocker arm 23 backward to reset. This maintains the transmission coordination accuracy between the lever 21, the rocker arm 23, and the traction rod 26, and further improves the reliability of the tripping and re-tripping actions.

[0030] It also includes a housing 3 fixed inside the circuit breaker, and an electronic tripping assembly 1 installed inside the housing 3. The housing 3 includes an upper housing 31, a lower housing 32, and a fixing member 33. The lower housing 32 is provided with a cavity 322 for inserting the electronic tripping assembly 1. A compression spring 15 and a push rod 16 extend from the rear side of the cavity 322. The bracket 13 is provided with a groove B131 on the top of the left and right sides. The upper housing 31 is fastened to the lower housing 32 and is provided with a boss B312 that fits into the groove B131. The upper housing 31 and the lower housing 32 are provided with a corresponding connecting hole 311 and a connecting hole 321. The fixing member 33 passes through the connecting hole 311 and the connecting hole 321 for threaded connection.

[0031] The electronic tripping assembly 1 is housed in the cavity 322. The upper shell 31 is fastened to the lower shell 32 to limit the electronic tripping assembly 1 within the cavity 322. The external pressure spring 15 and push rod 16 of the electronic tripping assembly 1 extend from the rear side of the cavity 322 and work in conjunction with the operating mechanism assembly 2. The housing 3 is fixed inside the circuit breaker. Because the housing 3 has a simpler and neater shape, it can be easily installed in circuit breakers with different internal spaces. This allows for more flexible setting of the position of the electronic tripping assembly 1, making it highly versatile.

Claims

1. An electronic tripping mechanism for a reclosing circuit breaker, characterized in that: The circuit breaker includes an electronic trip assembly (1) and an operating mechanism assembly (2) installed inside the circuit breaker. The electronic trip assembly (1) includes a coil frame (11), a bracket (13), a cover plate (14), an external pressure spring (15), a push rod (16), a moving iron core (17), an internal pressure spring (18), and a stationary iron core (19). The bracket (13) is fixedly connected to the front and left and right sides of the coil frame (11). The front side of the coil frame (11) is provided with a partition plate (110) and a permanent magnet (111). The outer wall of the coil frame (11) is nested with a coil (12). The stationary iron core (19), the partition plate (110), and the permanent magnet (111) pass through the coil. The skeleton (11) is arranged inside and connected to the bracket (13) from back to front. The bracket (13) has a riveting boss (132) on the rear side for riveting into the cover plate (14). The moving iron core (17) and the inner pressure spring (18) are inserted into the cover plate (14). The push rod (16) is a double tube structure. The outer tube of the push rod (16) is sleeved on the outside of the cover plate (14). The inner tube of the push rod (16) is inserted into the cover plate (14) and sleeved on the rear end of the moving iron core (17). The outer pressure spring (15) is sleeved on the outside of the push rod (16) and connected between the cover plate (14) and the outer tube of the push rod (16). The inner pressure spring (18) is sleeved on the rear end of the moving iron core (17) and connected to the cover plate (14). The inner tube of the push rod (16) is connected to the moving iron core (17); the operating mechanism assembly (2) is connected between the circuit breaker's opening and closing handle and the push rod (16) for linkage cooperation; the operating mechanism assembly (2) includes a lever (21), a rocker arm (23), a traction rod (26) and a pair of clamps (27). The clamps (27) are set on the left and right sides of the operating mechanism assembly (2) and fixed inside the circuit breaker. The clamps (27) are axially connected with a first rivet (22) and a second rivet (25). The bottom of the lever (21) and the top of the traction rod (26) are axially connected to the clamps (27). The top of the lever (21) is connected to the circuit breaker's opening and closing handle for linkage cooperation. In a coordinated manner, the bottom of the rocker arm (23) is connected to the second rivet shaft (25), the first rivet shaft (22) is located below the rocker arm (23) and the traction rod (26), and a torsion spring (24) is sleeved on the first rivet shaft (22). The front side of the lever (21) is provided with a lever push rod (211) aligned with the rear side of the rocker arm (23). The front side of the rocker arm (23) is aligned with the rear side of the traction rod (26) and there is a free stroke gap between them. The front side of the traction rod (26) is attached to the rear side of the push rod (16). The torsion spring (24) is provided with a short torsion spring leg (241) connected to the rocker arm (23) and a long torsion spring leg (242) connected to the traction rod (26).

2. The electronic tripping mechanism of a reclosing circuit breaker according to claim 1, characterized in that: The rocker arm (23) has a feature surface 1 (237) on the rear side that aligns with the lever push rod (211). The traction rod (26) includes a feature surface 2 (261) on the front side. The push rod (16) has a feature surface 3 (161) on the rear side that aligns with the feature surface 2 (261). The bottom of the rocker arm (23) has a limiting groove 1 (232) and a boss A (236). The rear side of the traction rod has a limiting groove 2 (263). The short leg (241) of the torsion spring is inserted into the limiting groove 1 (232) for limiting engagement. The long leg (242) of the torsion spring is inserted into the limiting groove 2 (263) for limiting engagement. The position of the boss A (236) corresponds to the short leg (241) of the torsion spring. The traction rod has a groove A (262) on the rear side of the feature surface 2 (261). The front side of the rocker arm (23) is aligned with the groove A (262).

3. The electronic tripping mechanism of a reclosing circuit breaker according to claim 1, characterized in that: The clamping plate (27) is provided with mounting hole 1 (273) and mounting hole 2 (274), the rocker arm (23) is provided with riveting hole (233), the second riveting shaft (25) passes through the riveting hole (233) and its end is riveted to the mounting hole 1 (273), and the end of the first riveting shaft (22) is riveted to the mounting hole 2 (274); the clamping plate (27) is provided with limiting surface 1 (271) and limiting surface 2 (272), one end of limiting surface 1 (271) and limiting surface 2 (272) are connected to form a limiting angle, the rocker arm (23) is provided with a protrusion that extends into the limiting angle, and in the circuit breaker tripped state, there is a travel interval between the protrusion and the limiting surface 2 (272), the protrusion is provided with a limiting surface 1 (234) facing the limiting surface 1 (271) and a limiting surface 2 (235) facing the limiting surface 2 (272).

4. The electronic tripping mechanism of a reclosing circuit breaker according to claim 1, characterized in that: It also includes a housing (3) fixed inside the circuit breaker, and an electronic trip assembly (1) installed inside the housing (3); the housing (3) includes an upper housing (31), a lower housing (32), and a fixing member (33); the lower housing (32) is provided with a cavity (322) for inserting the electronic trip assembly (1), a compression spring (15) and a push rod (16) extend from the rear side of the cavity (322), and the bracket (13) is provided with a groove B (131) on the top of the left and right sides, the upper housing (31) is fastened to the lower housing (32) and is provided with a boss B (312) that fits into the groove B (131); the upper housing (31) and the lower housing (32) are provided with a corresponding connection hole one (311) and a connection hole two (321), and the fixing member (33) passes through the connection hole one (311) and the connection hole two (321) for threaded connection.

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