Circuit breaker delay test platform

Abstract

The invention relates to the technical field of circuit breaker testing, and discloses a circuit breaker delay testing platform which comprises a mounting table, a clamping platform is fixedly arranged on the mounting table, a distance sensor is arranged on one side of the clamping platform, a positioning table is arranged at the bottom of the opposite side of the clamping platform, a pressing assembly is arranged above the clamping platform, and a conductive sliding rod is slidably assembled on the mounting table. One end of the conductive sliding rod is in contact with a circuit breaker joint, the other end of the conductive sliding rod is connected with an end piece connected with a power supply, a vertical positioning rod is slidably assembled below the positioning table, the upper end of the positioning rod penetrates through the positioning table and is connected with the bottom of the circuit breaker, and the lower end of the positioning rod is connected with a motor driving the positioning rod to rotate; according to the invention, cooperative positioning can be carried out on the circuit breaker in the clamping stage, a distance sensor is combined to trigger a test process, multi-degree-of-freedom clamping and accurate positioning of the circuit breaker are realized, and the problems of large manual operation error and high safety risk in a traditional test are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breaker testing, and particularly to a circuit breaker delay testing platform. Background Art

[0002] Circuit breaker delay refers to the characteristic that the circuit breaker does not immediately execute the action after receiving the opening or closing command, but completes the contact opening or closing after a preset time. This delay can be divided into two categories. The first category is that during overload or short - circuit faults, the circuit breaker decides whether to delay tripping according to the magnitude and duration of the current. The second category is that after the circuit breaker is closed, it delays for a certain time before outputting current to avoid problems such as voltage displacement and over - voltage caused by non - simultaneous closing of three phases.

[0003] At present, the testing of circuit breaker delay characteristics mainly relies on manually building a temporary circuit in cooperation with a timing device, which has problems such as poor versatility of the testing platform and low automation. The testing platform device lacks a standardized clamping structure. For circuit breakers of different specifications, the mechanical positioning components need to be repeatedly adjusted, resulting in low clamping efficiency and difficulty in ensuring the consistency of contact pressure. Moreover, during the testing process, manual operation is required to turn on and off the power supply and physically connect the circuit breaker contacts. This not only has cumbersome and time - consuming operation steps, but also poses a risk of high - voltage electric shock. At the same time, the existing equipment lacks an intelligent detection mechanism for contact status. After the testing is completed, the power supply cannot be automatically cut off and the physical connection cannot be released. When the tester misjudges the equipment status and performs live disassembly, it is easy to cause contact arcing and discharge phenomena. During the measurement process, the testing system cannot achieve synchronous and accurate measurement of the overload current gradient and the delay time. When relying on manual recording, there is a timing error of at least ±15 ms, which seriously affects the drawing accuracy of the circuit breaker protection characteristic curve. Summary of the Invention

[0004] (1) Technical problems to be solved: Aiming at the deficiencies of the prior art, the present invention provides a circuit breaker delay testing platform, which has the advantages of being flexibly adaptable to different circuit breakers and having a safe testing process, and solves the problems of poor versatility of traditional testing devices, cumbersome measurement, low efficiency, and operation risks.

[0005] (2) Technical solution: To achieve the purpose of flexibly adapting to different circuit breakers and ensuring the safety of the test process, the present invention provides the following technical solution: A circuit breaker delay test platform, including a mounting table, on which a clamping platform is fixedly arranged. A distance sensor is arranged on one side of the clamping platform, and a positioning table is arranged at the bottom of the opposite side. A pressing component is arranged above the clamping platform, and a space for clamping the circuit breaker is formed between the pressing component and the positioning table; The mounting table is provided with two groups of through holes penetrating its surface, and conductive sliding rods are slidably assembled in the through holes. One end of the conductive sliding rod contacts the circuit breaker joint, and the other end of the conductive sliding rod is connected with a terminal piece connected to the power supply; A telescopic cylinder is fixedly arranged at the rear side of the mounting table, and the telescopic end of the telescopic cylinder is connected with a pressing plate. The conductive sliding rod is fixedly connected with the pressing plate and can be telescoped synchronously; A vertical positioning rod is slidably assembled below the positioning table. The upper end of the positioning rod penetrates the positioning table and is connected with the bottom of the circuit breaker, and the lower end of the positioning rod is connected with a motor for driving its rotation.

[0006] Preferably, two or more sets of telescopic cylinders are installed.

[0007] Preferably, an arc-shaped positioning groove is formed at the front end of the clamping platform, and two sets of tightening blocks are further arranged at the front end of the clamping platform. The two sets of tightening blocks are respectively installed at the upper and lower ends of the arc-shaped positioning groove, and the tightening blocks tighten the front end face of the circuit breaker.

[0008] Preferably, a telescopic piston for controlling the height of the positioning rod is arranged between the motor and the positioning rod; The positioning rod includes an outer rod and an inner rod, and a gas channel is arranged between the inner rod and the outer rod. The gas channel is communicated with the telescopic piston, and a one-way valve is arranged between the gas channel and the telescopic piston. When the telescopic piston continuously telescopes, the exhaust pressure of the one-way valve is less than the gas pressure during the telescoping process of the telescopic piston, so that the gas in the telescopic piston enters the gas channel through the one-way valve.

[0009] Preferably, the conductive sliding rod includes a sliding rod and a pressure sensing head. The pressure sensing head is fixedly installed at the front end of the sliding rod. The sliding rod is slidably connected with the mounting table and a return spring is arranged between the sliding rod and the pressing plate. The spring is coaxially installed on the sliding rod, and an electric core is arranged in the sliding rod. One end of the electric core is communicated with the pressure sensing head, and the other end of the electric core is communicated with the terminal piece.

[0010] Preferably, the pressure-sensitive contact head includes a fixed contact head and a telescopic contact head that can axially expand and contract. The fixed contact head is fixedly connected to the sliding rod and forms an electrical conduction path with the internal battery cell; the telescopic contact head is connected to the fixed contact head through an elastic telescopic rod. A conductive surface for contacting the circuit breaker joint is provided at the front end of the telescopic contact head, and a moving contact interlock ring is fixedly connected to the rear end of the telescopic contact head; when the front end of the telescopic contact head contacts the circuit breaker joint, the sliding rod continuously moves axially to compress the telescopic rod, so that the moving contact interlock ring contacts the fixed contact head to form an electrical conduction path.

[0011] Preferably, two or more groups of the telescopic rods are equidistantly arranged in an array along the circumferential direction of the telescopic contact head.

[0012] Preferably, a stator coil is coaxially connected to the moving contact interlock ring, and a ring-shaped safety ring is rotatably connected to the outer circumference of the fixed contact head. A plurality of magnets are equidistantly embedded along the circumferential direction on the inner wall of the safety ring; when the moving contact interlock ring is in electrical contact with the fixed contact head, the stator coil is energized to generate a rotating magnetic field, and the magnets drive the safety ring to rotate around the axis of the fixed contact head under the action of the magnetic field.

[0013] Preferably, the axial length of the magnet is the same as the axial length of the stator coil, and the end face of the magnet and the end face of the fixed contact head are located in the same plane.

[0014] Preferably, an air pipe is provided on the mounting table, and the air pipe is connected to the air cylinder and the telescopic piston.

[0015] Preferably, the safety ring and the telescopic rod are made of non-conductive arc extinguishing materials.

[0016] (III) Beneficial effects: Compared with the prior art, the present invention provides a circuit breaker delay test platform, which has the following beneficial effects: 1. In this circuit breaker delay test platform, through the combined use of the clamping platform structure and the positioning table structure, collaborative positioning can be carried out during the clamping stage. Combining with the distance sensor to trigger the test process, multi-degree-of-freedom clamping and precise positioning of the circuit breaker are realized. After triggering the test process, the conductive sliding rod is driven by the air cylinder to automatically dock with the circuit breaker contact to form an electrical connection. At the same time, the automatic tightening and fixing of the bottom of the circuit breaker is realized through the linkage of the positioning rod and the motor. Cooperating with the dynamic contact detection of the pressure-sensitive contact head and the automatic loading of the overload signal, a closed-loop test system is formed. After the circuit breaker is clamped, all test actions are driven by the sensor signal to the actuator to complete according to the preset logical sequence, without manual intervention in the circuit connection, signal loading and safety monitoring links. Therefore, full-process automatic operation is realized on the premise of ensuring the test accuracy, eliminating the cumbersome steps of repeatedly adjusting the equipment, manually wiring and manually recording data in the traditional test, greatly improving the test efficiency and reducing the labor and time costs, and solving the problems of large manual operation errors and high safety risks in the traditional test.

[0017] 2. The breaker delay test platform, through the combined use of the fixed contact structure and the telescopic contact structure, realizes the progressive loading of the contact pressure and the dynamic compensation of the contact gap during the docking process between the breaker contacts and the pressure-sensitive contacts. This not only avoids damage to the contact surface caused by rigid impact but also ensures the establishment of the conductive path after the physical contact is stable through the delay power-on mechanism. Combined with the physical isolation effect of the safety ring, the possibility of arc discharge at the moment of contact is eliminated, greatly improving the safety of the test.

[0018] 3. The breaker delay test platform, through the combined use of the safety ring structure and the stator coil structure, forms a dynamic rotating magnetic field between the moving contact interlock ring and the fixed contact. Using the Lorentz force to confine the arc plasma, the arc is restricted within the magnetic field range and the radial dispersion of the plasma is achieved by means of the centrifugal effect. Combined with the annular air flow barrier generated by the rotation of the safety ring, the aggregation of arc energy is effectively inhibited and the composite process with the insulating medium is accelerated. At the same time, the safety ring can form a visual motion warning during rotation, and the energized working condition of the equipment can be intuitively reflected through the rotation state of the safety ring, thus solving the risks of equipment damage and personnel electric shock caused by arc leakage in the traditional test platform and effectively preventing the live disassembly accidents caused by the misjudgment of the equipment state by the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the breaker delay test platform in the present invention for installing a breaker.

[0020] Figure 2 It is a three-dimensional structural schematic diagram of the breaker delay test platform in the present invention.

[0021] Figure 3 It is a front view of the structure of the breaker delay test platform in the present invention.

[0022] Figure 4 It is a rear view of the structure of the breaker delay test platform in the present invention.

[0023] Figure 5 It is Figure 4 a cross-sectional view taken along the line A-A in

[0024] Figure 6 It is a rear three-dimensional structural schematic diagram of the breaker delay test platform in the present invention.

[0025] Figure 7 It is Figure 5 a partial enlarged view of the B pressure-sensitive contact structure in

[0026] Figure 8 It is a schematic diagram of the pressure-sensitive contact structure in the present invention after installing a breaker.

[0027] In the figure: 1, mounting table; 2, clamping platform; 21, distance sensor; 22, positioning table; 23, pressing component; 24, arc-shaped positioning groove; 25, jacking block; 3, conductive sliding rod; 31, pressure touch head; 311, fixed contact; 312, telescopic contact; 313, telescopic rod; 314, moving contact interlocking ring; 315, stator coil; 316, safety ring; 317, magnet; 32, end piece; 33, sliding rod; 34, spring; 4, air cylinder; 5, pressing plate; 6, positioning rod; 61, outer rod; 62, inner rod; 7, motor; 8, telescopic piston; 9, circuit breaker. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Please refer to Figures 1-4, a circuit breaker delay test platform, comprising a mounting table 1, on which a clamping platform 2 is fixedly arranged. A distance sensor 21 is provided on one side of the clamping platform 2, and a positioning table 22 is provided at the bottom of the opposite side. Above the clamping platform 2, a pressing component 23 is arranged. A space for clamping the circuit breaker 9 is formed between the pressing component 23 and the positioning table 22. The setting of the distance sensor 21 can detect whether the circuit breaker 9 is correctly placed on the clamping platform 2 and trigger the subsequent test process. When the side of the circuit breaker 9 is closely attached to the side of the clamping platform 2, the distance sensor 21 can sense this state, thereby starting the automated operation of the test platform. The positioning table 22 and the pressing component 23 respectively fix the circuit breaker 9 from the bottom and above, ensuring the stability and accuracy of the circuit breaker 9 during the test. This collaborative clamping method can adapt to circuit breakers 9 of different specifications and sizes, improving the versatility of the test platform. At the same time, since the clamping process is completed by a mechanical structure, the risk of high-voltage electric shock caused by manual operation can be avoided, improving the safety of the test; The mounting table 1 is provided with two groups of through holes penetrating its surface. Conductive sliding rods 3 are slidably assembled in the through holes. One end of the conductive sliding rod 3 contacts the joint of the circuit breaker 9, and the other end of the conductive sliding rod 3 is connected to an end piece 32 connected to the power supply. The design of the conductive sliding rod 3 enables automatic contact with the joint of the circuit breaker 9 after the circuit breaker 9 is clamped, forming an electrical connection. This automatic electrical connection method avoids errors and risks caused by manual wiring, improving the accuracy and safety of the test. And through the sliding assembly method, the conductive sliding rod 3 can be adjusted according to the joint position of different circuit breakers 9 to adapt to different test requirements; A telescopic cylinder 4 is fixedly arranged at the rear of the mounting table 1. The telescopic end of the cylinder 4 is connected to a pressing plate 5. The conductive sliding rod 3 is fixedly connected to the pressing plate 5 and can expand and contract synchronously. By fixing and controlling the expansion and contraction of the conductive sliding rod 3 through the pressing plate 5, the stable contact between the conductive sliding rod 3 and the joint of the circuit breaker 9 can be ensured, avoiding test errors caused by poor contact; A vertical positioning rod 6 is slidably assembled below the positioning table 22. The upper end of the positioning rod 6 penetrates the positioning table 22 and is connected to the bottom of the circuit breaker 9. The design of the vertical positioning rod 6 enables it to automatically insert into the bottom of the circuit breaker 9 and be fixed during the clamping process of the circuit breaker 9. The lower end of the positioning rod 6 is connected to a motor 7 that drives its rotation.

[0030] Please refer to Figure 1 , Figure 2 , Figure 6, two or more sets of cylinders 4 are installed. Installing two or more sets of cylinders 4 can ensure that during the test, the compression of the circuit breaker 9 and the drive of the conductive slide bar 3 are more stable and reliable. The combined action of multiple cylinders 4 can disperse the load, reduce the failure risk of a single cylinder 4, and thus improve the stability and reliability of the entire test platform. An arc-shaped positioning groove 24 is provided at the front end of the clamping platform 2. The design of the arc-shaped positioning groove 24 can match the switch position of the circuit breaker 9 to ensure that the circuit breaker 9 can be conveniently opened and closed. Two sets of tightening blocks 25 are also provided at the front end of the clamping platform 2. The two sets of tightening blocks 25 are respectively installed at the upper and lower ends of the arc-shaped positioning groove 24, and the tightening block 25 presses against the front end face of the circuit breaker 9. The tightening block 25 further fixes the front end face of the circuit breaker 9 to prevent it from moving or deflecting during the test. An air pipe is provided on the installation platform 1. The air pipe is connected to the cylinder 4 and the telescopic piston 8. The air pipe is not shown in the figure.

[0031] Please refer to Figure 1 、 Figure 5 , a telescopic piston 8 for controlling the height of the positioning rod 6 is provided between the motor 7 and the positioning rod 6. Through the telescopic piston 8, the height of the positioning rod 6 can be accurately controlled to adapt to the bottom structure of circuit breakers 9 of different specifications; the positioning rod 6 includes an outer rod 61 and an inner rod 62. A gas channel is provided between the inner rod 62 and the outer rod 61. The gas channel is connected to the telescopic piston 8, and a one-way valve is provided between the gas channel and the telescopic piston 8. When the telescopic piston 8 continuously expands and contracts, the exhaust pressure of the one-way valve is less than the gas pressure during the expansion and contraction of the telescopic piston 8, so that the gas in the telescopic piston 8 enters the gas channel through the one-way valve and enters the circuit breaker 9 through the gas channel, improving the gas circulation inside the circuit breaker 9.

[0032] Please refer to Figure 5 、 Figure 7 and Figure 8 , the conductive slide bar 3 includes a sliding bar 33 and a pressure-sensitive contact 31. The pressure-sensitive contact 31 is fixedly installed at the front end of the sliding bar 33. Fixing the pressure-sensitive contact 31 at the front end of the sliding bar 33 can ensure that during the test, the pressure-sensitive contact 31 can stably contact the joint of the circuit breaker 9. The sliding bar 33 is slidably connected to the installation platform 1 and a return spring 34 is provided between the sliding bar 33 and the pressing plate 5. The spring 34 is coaxially installed on the sliding bar 33. The setting of the return spring 34 enables the sliding bar 33 to automatically reset after being subjected to an external force, and also provides a certain elastic buffer during the contact process, avoiding damage to the joint of the circuit breaker 9 and the pressure-sensitive contact 31 caused by rigid impact. A battery core is provided inside the sliding bar 33. One end of the battery core is connected to the pressure-sensitive contact 31, and the other end of the battery core is connected to the end piece 32. The pressure-sensitive contact 31 includes a fixed contact 311 and an axially telescopic telescopic contact 312. The fixed contact 311 is fixedly connected to the sliding bar 33 and forms an electrical conduction path with the internal battery core, as Figure 8As shown in the figure; the telescopic contact 312 is connected to the fixed contact 311 through an elastic telescopic rod 313, enabling the telescopic contact 312 to expand and contract when subjected to an external force. The front end of the telescopic contact 312 is provided with a conductive surface that contacts the joint of the circuit breaker 9. The rear end of the telescopic contact 312 is fixedly connected with a moving contact interlock ring 314; when the front end of the telescopic contact 312 contacts the joint of the circuit breaker 9, the sliding rod 33 continuously moves axially to compress the telescopic rod 313, causing the moving contact interlock ring 314 to contact the fixed contact 311 to form a conductive path. Through the continuous axial movement of the sliding rod 33, the telescopic rod 313 can be gradually compressed, forming a stable conductive path between the moving contact interlock ring 314 and the fixed contact 311. This design can ensure that during the test process, electrical signals can be stably transmitted, avoiding test errors caused by poor contact. There are two or more groups of telescopic rods 313 arranged equidistantly in the circumferential direction of the telescopic contact 312. The multiple groups of telescopic rods 313 arranged equidistantly in the circumferential direction of the telescopic contact 312 can provide support and contact force in multiple directions, making the telescopic contact 312 more stable when contacting the joint of the circuit breaker 9.

[0033] Please refer to Figure 5 , Figure 7 and Figure 8 , a stator coil 315 is coaxially connected to the moving contact interlock ring 314, and a ring-shaped safety ring 316 is rotatably connected to the outer periphery of the fixed contact 311. A number of magnets 317 are equidistantly embedded in the inner wall of the safety ring 316 along the circumferential direction, and the stator coil 315 can generate a rotating magnetic field after being energized. This rotating magnetic field interacts with the magnets 317 embedded in the inner wall of the safety ring 316, which can drive the safety ring 316 to rotate around the axis of the fixed contact 311, realizing the automatic rotation of the safety ring 316. The rotation of the safety ring 316 can generate a ring-shaped air flow barrier between the contacts, effectively suppressing the aggregation of arc energy, accelerating the arc extinction, thereby eliminating the risk of arc leakage and improving the safety of the test process, as Figure 8 shown. The axial length of the magnet 317 is the same as the axial length of the stator coil 315, and the end face of the magnet 317 and the end face of the fixed contact 311 are located in the same plane. The same axial length of the magnet 317 and the stator coil 315 can ensure the uniform distribution of the rotating magnetic field in the axial direction, improving the constraint effect of the magnetic field on the arc plasma. The safety ring 316 and the telescopic rod 313 are made of non-conductive arc extinguishing materials. The non-conductive arc extinguishing materials can effectively prevent the arc from breaking down on the surfaces of the safety ring 316 and the telescopic rod 313, protecting these components from arc damage. At the same time, the arc extinguishing material has good arc extinguishing performance, which can accelerate the arc extinguishing process and reduce the impact of the arc on the test platform. The non-conductive arc extinguishing material is specifically made of non-glass fiber reinforced plastic or polytetrafluoroethylene.

[0034] Working principle: Place the circuit breaker 9 to be tested on the positioning table 22, and adjust the pressing assembly 23 so that the upper and lower ends of the circuit breaker 9 are clamped by the pressing assembly 23 and the positioning table 22 respectively, and at the same time adjust the circuit breaker 9 so that its front end closely abuts against the abutting block 25. Then push the circuit breaker 9 inward in a direction perpendicular to the clamping platform 2, so that the side of the circuit breaker 9 closely abuts against the side of the clamping platform 2, and at the same time start the test platform. The distance sensor 21 will start the test by judging whether the side of the circuit breaker 9 closely abuts against the side of the clamping platform 2. When the distance sensor 21 senses that the side of the circuit breaker 9 closely abuts against the side of the clamping platform 2, first, the telescopic piston 8 starts, so that the positioning rod 6 is inserted into the bottom of the circuit breaker 9, and at the same time, the positioning rod 6 is driven to rotate by an electric appliance, so that the inner rod 62 is inserted into the bottom screw hole of the circuit breaker 9. And when the internal temperature of the circuit breaker 9 rises abnormally due to overload or short circuit during the test, the gas filled in the telescopic piston 8 rises to increase the internal gas pressure; when the gas pressure exceeds the opening threshold of the one-way valve, the high-pressure gas is injected into the internal cavity of the circuit breaker 9 through the gas channel, forming a forced convection air flow, which not only accelerates the recovery speed of the insulating medium in the contact area after the arc is extinguished, but also takes away the heat accumulated inside the circuit breaker 9 through the directional air flow, and can avoid the risk of secondary breakdown caused by local temperature rise in traditional tests. When the positioning rod 6 completes the positioning of the circuit breaker 9, the telescopic cylinder 4 will start and drive the pressing plate 5 and the conductive sliding rod 3 to move towards the contact of the circuit breaker 9, and make the pressure contact head 31 communicate with the contact of the circuit breaker 9. Apply a modulated voltage and current signal through the power supply to simulate the actual working condition, synchronously trigger the circuit breaker 9 to perform opening and closing actions, and the delay time is measured by the time difference between the moment when the pressure contact head 31 is energized and overloaded and the current signal generated when the circuit breaker 9 is powered off. At the same time, trigger the protection mechanism of the circuit breaker 9 to act by grading and loading the overload current, and monitor the response process of the circuit breaker 9 from the occurrence of overload to the complete cut-off of the circuit in real time, so as to realize the integrated and accurate test of the mechanical delay and electrical protection delay of the circuit breaker 9 under different working modes. During the use of the present invention, only the circuit breaker 9 needs to be clamped and installed, and the subsequent test process is fully automated, which greatly improves the efficiency of the delay test of the circuit breaker 9 and reduces the cost of the delay test of the circuit breaker 9.

[0035] During the process of the pressure-sensitive contact head 31 contacting the contact of the circuit breaker 9, the telescopic contact 312 first achieves flexible contact with the contact of the circuit breaker 9 through the pre-tightening force of the elastic telescopic rod 313. Then, as the telescopic cylinder 4 pushes the sliding rod 33 to move axially, the compression stroke of the elastic telescopic rod 313 is used to gradually eliminate the contact gap and apply a constant contact pressure to ensure stable contact of the contacts. When the sliding rod 33 continues to advance to the preset stroke, the moving contact interlock ring 314 forms a rigid contact with the fixed contact 311. At this time, the elastic telescopic rod 313 is completely compressed. This structure avoids the impact damage during the instant of rigid contact and can adaptively compensate for the deviation of the contact position during the dynamic adjustment process. And by adopting a phased conduction mechanism during the connection process, first, the telescopic contact 312 makes physical contact with the contact of the circuit breaker 9, and then the telescopic cylinder 4 drives the sliding rod 33 to move further axially, compressing the telescopic rod 313 to make the moving contact interlock ring 314 contact with the fixed contact 311 to form a conductive path. This process ensures that the current is conducted after the contact surface between the telescopic contact 312 and the contact of the circuit breaker 9 reaches a stable crimping state by delaying the power-on, thereby avoiding arc discharge caused by vibration or gaps during the instant of contact. At the same time, the safety ring 316 coaxially arranged on the fixed contact 311 can expose the arc formed when the moving contact interlock ring 314 is conducting, avoiding danger.

[0036] When the moving contact interlock ring 314 is connected to the fixed contact 311, the stator coil 315 installed on the moving contact interlock ring 314 is energized, and a rotating magnetic field generated by the energization of the stator coil 315 drives the magnet 317 to drive the safety ring 316 to rotate at a high speed around the axis of the contact, as Figure 8 shown. And the dynamic magnetic field formed between the stator coil 315 and the magnet 317 covers the contact area of the contact. This magnetic field can exert a directional confinement effect on the arc plasma through the Lorentz force. When an arc is generated between the contacts, the charged particles in the arc plasma are affected by the Lorentz force applied by the dynamic magnetic field during their movement, and their movement direction is forced to change to the tangential direction of the magnetic field rotation, so as to confine the arc within the range of the magnetic field action and prevent it from spreading out to form a free arc. At the same time, the centrifugal action generated by the rotating magnetic field stretches and disperses the confined arc plasma radially, accelerating its recombination speed with the surrounding insulating medium and suppressing the aggregation and reignition of arc energy. And since the safety ring 316 is made of a non-conductive arc extinguishing material, and the rotation of the safety ring 316 itself can form an annular air flow barrier around the contact, effectively accelerating the arc extinction, thus eliminating the risk of arc leakage and ensuring the safety of the test process. The continuous rotation state of the safety ring 316 can form a motion warning, intuitively prompting the operator of the energized state of the equipment. The design of the safety ring 316 not only actively eliminates the risk of arc leakage between the contacts, but also avoids mis-dismantling behavior during the test through dynamic visual signals, realizing the coordinated guarantee of electrical safety and operation safety.

[0037] It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0038] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A circuit breaker delay test platform, comprising a mounting table (1), a clamping platform (2) is fixedly arranged on the mounting table (1), a distance sensor (21) is arranged on one side of the clamping platform (2), and a positioning table (22) is arranged at the bottom of the opposite side, and is characterized in that: Above the clamping platform (2), a pressing component (23) is provided. A space for clamping the circuit breaker (9) is formed between the pressing component (23) and the positioning table (22). The mounting table (1) is provided with two groups of through holes penetrating its surface. A conductive sliding rod (3) is slidably assembled in the through holes. One end of the conductive sliding rod (3) is in contact with the joint of the circuit breaker (9), and the other end of the conductive sliding rod (3) is connected with a terminal piece (32) connected to the power supply. A telescopic cylinder (4) is fixedly provided at the rear side of the mounting table (1). The telescopic end of the telescopic cylinder (4) is connected with a pressing plate (5). The conductive sliding rod (3) is fixedly connected with the pressing plate (5) and can telescopically move synchronously. A vertical positioning rod (6) is slidably assembled below the positioning table (22). The upper end of the positioning rod (6) penetrates through the positioning table (22) and is connected with the bottom of the circuit breaker (9). The lower end of the positioning rod (6) is connected with a motor (7) for driving its rotation.

2. The circuit breaker delay test platform according to claim 1, characterized in that: An arc-shaped positioning groove (24) is formed at the front end of the clamping platform (2). Two groups of pressing blocks (25) are further provided at the front end of the clamping platform (2). The two groups of pressing blocks (25) are respectively installed at the upper and lower ends of the arc-shaped positioning groove (24). The pressing blocks (25) press against the front end face of the circuit breaker (9).

3. The circuit breaker delay test platform according to claim 1, characterized in that: A telescopic piston (8) for controlling the height of the positioning rod (6) is provided between the motor (7) and the positioning rod (6). The positioning rod (6) includes an outer rod (61) and an inner rod (62). A gas channel is provided between the inner rod (62) and the outer rod (61). The gas channel is communicated with the telescopic piston (8). A one-way valve is provided between the gas channel and the telescopic piston (8). When the telescopic piston (8) continuously telescopically moves, the exhaust pressure of the one-way valve is less than the gas pressure during the telescopic movement of the telescopic piston (8), so that the gas in the telescopic piston (8) enters the gas channel through the one-way valve.

4. A circuit breaker delay test platform according to claim 1, characterized in that: The conductive sliding rod (3) includes a sliding rod (33) and a pressure-sensitive contact head (31). The pressure-sensitive contact head (31) is fixedly installed at the front end of the sliding rod (33). The sliding rod (33) is slidably connected with the mounting table (1). A return spring (34) is provided between the sliding rod (33) and the pressing plate (5). The return spring (34) is coaxially installed on the sliding rod (33). A battery core is provided in the sliding rod (33). One end of the battery core is communicated with the pressure-sensitive contact head (31), and the other end of the battery core is communicated with the terminal piece (32).

5. A circuit breaker delay test platform according to claim 4, characterized in that: The pressure-sensitive contact head (31) includes a fixed contact head (311) and a telescopically retractable contact head (312). The fixed contact head (311) is fixedly connected to the sliding rod (33) and forms an electrical conduction path with the internal battery cell. The telescopic contact head (312) is connected to the fixed contact head (311) through an elastic telescopic rod (313). A conductive surface that contacts the joint of the circuit breaker (9) is provided at the front end of the telescopic contact head (312). A moving contact interlock ring (314) is fixedly connected to the rear end of the telescopic contact head (312). When the front end of the telescopic contact head (312) contacts the joint of the circuit breaker (9), the sliding rod (33) continuously moves axially to compress the telescopic rod (313), causing the moving contact interlock ring (314) to contact the fixed contact head (311) to form an electrical conduction path.

6. The circuit breaker delay test platform according to claim 5, characterized in that: Two or more groups of the telescopic rods (313) are arranged at equal intervals in the circumferential direction of the telescopic contact head (312).

7. A circuit breaker delay test platform according to claim 1, characterized in that: Two or more groups of the telescopic cylinders (4) are installed.

8. A circuit breaker delay test platform according to claim 5, characterized in that: A stator coil (315) is coaxially connected to the moving contact interlock ring (314). A ring-shaped safety ring (316) is rotatably connected to the outer periphery of the fixed contact head (311). A plurality of magnets (317) are equidistantly embedded in the inner wall of the safety ring (316) in the circumferential direction. When the moving contact interlock ring (314) is in electrical contact with the fixed contact head (311), the stator coil (315) is energized to generate a rotating magnetic field, and the magnets (317) drive the safety ring (316) to rotate around the axis of the fixed contact head (311) under the action of the magnetic field.

9. A circuit breaker delay test platform according to claim 8, characterized in that: The axial length of the magnet (317) is the same as the axial length of the stator coil (315), and the end face of the magnet (317) and the end face of the fixed contact head (311) are located in the same plane.

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