A speed-adjustable vacuum circuit breaker

Abstract

A speed-adjustable vacuum circuit breaker includes a controller, a drive mechanism, a current sensor, a supporting insulator, an insulating pull rod, a moving-end conductor, a vacuum interrupter, a static-end conductor, and a main cable. When the main circuit current of the circuit breaker passes through the main cable, the current sensor transmits the detected main circuit current value to the controller. The controller analyzes and determines the input main circuit current value. When the main circuit current value is less than the set value, the controller inputs a small-value tripping control current to the drive mechanism of the circuit breaker. At this time, the drive mechanism drives the circuit breaker to perform a slow tripping movement, thereby reducing mechanical impact. When the main circuit current value is greater than or equal to the set value N, the controller inputs a large-value tripping control current to the drive mechanism of the circuit breaker. At this time, the drive mechanism drives the circuit breaker to perform a fast tripping movement. The present invention solves the problems of short service life and high failure rate of traditional circuit breakers, while reducing the operating power consumption of the circuit breaker and achieving energy saving.

Description

Technical Field

[0001] The present invention relates to the technical field of power switchgear circuit breakers, and more particularly to a speed-adjustable vacuum circuit breaker. Background Art

[0002] The vacuum circuit breakers currently used in the power equipment industry do not have a speed regulation function. In order to ensure that the circuit breaker can successfully interrupt the short-circuit current, a relatively fast opening speed is required for each opening of the circuit breaker. A relatively fast speed will cause a large mechanical impact between the mechanical transmission parts of the circuit breaker, which is prone to mechanical failure and will reduce the reliability and mechanical life of the circuit breaker. The short-circuit current is generally between 15,000A and 25,000A, and the current passing through the circuit breaker is less than 1,000A in most cases. The probability that the main circuit current is a short-circuit current each time the circuit breaker is operated is less than one in a thousand. For non-short-circuit current circuit breakers, a relatively slow speed is required to successfully complete the opening operation. The present invention provides a vacuum circuit breaker equipped with a current sensor, which has the ability to select a fast or slow action mode according to the size of the main circuit current. This circuit breaker has greatly improved reliability and mechanical life compared to traditional circuit breakers. Summary of the Invention

[0003] The purpose of the present invention is to provide a speed-adjustable vacuum circuit breaker in order to solve the above technical problems.

[0004] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0005] A speed-adjustable vacuum circuit breaker, characterized in that it includes a controller, a driving mechanism, a current sensor, a support insulator, an insulating rod, a moving end conductor, a vacuum interrupter, a static end conductor, and a main cable, wherein the current sensor is arranged at the input end of the main cable, the vacuum interrupter is arranged at one end of the support insulator, the driving mechanism and the current sensor are both electrically connected to the controller, the main cable extends into the support insulator and is connected to the moving end conductor, one end of the moving end conductor extends into the vacuum interrupter, one end of the insulating rod is connected to the moving end conductor in the inner cavity of the support insulator, the driving mechanism is controlled by the controller to drive the insulating rod to move back and forth along the inner cavity of the support insulator, and the insulating rod drives the The moving end conductor moves back and forth in the vacuum interrupter, and one end of the static end conductor also extends into the vacuum interrupter and is located within the moving trajectory of the moving end conductor end. The controller; when the main circuit current of the circuit breaker passes through the main cable 9, the current sensor 3 transmits the detected main circuit current value to the controller. After receiving the opening operation instruction, the controller analyzes and judges the input main circuit current value. When the main circuit current value is less than the set value N, the controller inputs a small value opening control current to the driving mechanism of the circuit breaker, and at this time the driving mechanism drives the circuit breaker to perform a slow opening movement; when the main circuit current value is greater than or equal to the set value N, the controller inputs a large value opening control current to the driving mechanism of the circuit breaker, and at this time the driving mechanism drives the circuit breaker to perform a fast opening movement.

[0006] Furthermore, the driving mechanism is a bistable permanent magnet mechanism, which includes a moving iron core, a closing coil, an opening coil, a permanent magnet, a magnetic ring, an upper yoke, and a lower yoke, wherein the upper yoke and the lower yoke are arranged relative to each other, the moving iron core is arranged between the upper yoke and the lower yoke and both ends pass through, the permanent magnet is arranged between the upper yoke and the lower yoke, the closing coil and the opening coil are wound around the outer periphery of the permanent magnet, and the magnetic ring is arranged between the closing coil and the opening coil. It is characterized in that when the input closing coil is a small control current, the moving iron core moves upward slowly due to the electromagnetic force of the closing coil, and when the input closing coil is a large control current, the moving iron core moves upward quickly due to the electromagnetic force of the closing coil; when the input opening coil is a small control current, the moving iron core moves downward slowly due to the electromagnetic force of the opening coil, and when the input opening coil is a large control current, the moving iron core moves downward quickly due to the electromagnetic force of the opening coil.

[0007] Furthermore, by directly setting the parameters of the controller, the controller is set to input a small control current to the closing coil of the drive mechanism to control the slow closing movement of the circuit breaker; by directly setting the parameters of the controller, the controller is set to input a large control current to the closing coil of the drive mechanism to control the fast closing movement of the circuit breaker.

[0008] Furthermore, by directly setting the parameters of the controller, the controller is set to input a small control current to the opening coil of the drive mechanism to control the slow opening movement of the circuit breaker; by directly setting the parameters of the controller, the controller is set to input a large control current to the opening coil of the drive mechanism to control the fast opening movement of the circuit breaker.

[0009] Furthermore, when the current sensor detects that the main circuit current value through the main cable is less than the set value 1000A, the controller inputs a small-value tripping control current to the driving mechanism of the circuit breaker, and at this time the driving mechanism drives the circuit breaker to perform a slow tripping movement; when the current sensor detects that the main circuit current value through the main cable is greater than or equal to the set value 1000A, the controller inputs a large-value tripping control current to the driving mechanism of the circuit breaker, and at this time the driving mechanism drives the circuit breaker to perform a fast tripping movement.

[0010] The beneficial effects of the present invention are as follows:

[0011] 1. The current sensor is located at the main cable input end, which can monitor the main circuit current in real time and transmit the current value to the controller. This design enables the circuit breaker to operate according to the actual current value, improving the accuracy and safety of the operation. The controller inputs different trip control currents to the drive mechanism based on the current value transmitted by the current sensor. When the current value is less than the set value N, the controller inputs a small trip control current to drive the circuit breaker to perform a slow trip movement; when the current value is greater than or equal to the set value N, the controller inputs a large trip control current to drive the circuit breaker to perform a fast trip movement. This design enables the circuit breaker to automatically adjust the trip speed according to the current size, improving the adaptability and flexibility of the circuit breaker.

[0012] 2. The driving mechanism is controlled by a controller, which can automatically adjust the opening speed according to the current size, avoiding the tedious operation of manually adjusting the opening speed of traditional circuit breakers under different current conditions, thereby improving the efficiency and convenience of operation;

[0013] 3. The bi-stable permanent magnet mechanism utilizes the interaction between the permanent magnet and the coil, allowing the drive mechanism to switch between two stable states, improving the reliability and stability of the circuit breaker. By controlling the current in the closing and opening coils, the speed of the moving iron core can be precisely controlled. This design allows the circuit breaker to adjust the opening and closing speeds according to actual needs, improving operational flexibility and adaptability. Through the coordination of the current sensor and controller, the drive mechanism can respond promptly to current anomalies, reducing equipment damage or safety accidents caused by excessive current, significantly improving system safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of a speed-adjustable vacuum circuit breaker according to an embodiment of the present invention;

[0015] Figure 2 This is a schematic diagram of a speed-adjustable vacuum circuit breaker drive mechanism in an embodiment of the present invention;

[0016] Figure 3 This is a closing principle diagram of a speed-adjustable vacuum circuit breaker drive mechanism in an embodiment of the present invention;

[0017] Figure 4 This is a schematic diagram of the opening principle of a speed-adjustable vacuum circuit breaker drive mechanism in an embodiment of the present invention.

[0018] Figure numerals: 1. controller; 2. driving mechanism; 3. current sensor; 4. supporting insulator; 5. insulating pull rod; 6. moving end conductor; 7. vacuum interrupter; 8. static end conductor; 9. main cable; 21. moving iron core; 22. closing coil; 23. opening coil; 24. permanent magnet; 25. magnetic ring; 26. upper yoke; 27. lower yoke. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0021] Example 1

[0022] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Reference Figure 1The present invention provides an adjustable-speed vacuum circuit breaker, comprising a controller 1, a drive mechanism 2, a current sensor 3, a support insulator 4, an insulating rod 5, a moving conductor 6, a vacuum interrupter 7, a static conductor 8, and a main cable 9. The drive mechanism 2 is disposed below the support insulator 4, and the insulating rod 5 and the vacuum interrupter 7 are disposed within the support insulator 4. The drive mechanism 2 is connected to the insulating rod 5, which is in turn connected to the moving conductor 6 of the vacuum interrupter 7. When the drive mechanism 2 performs a closing operation under the control of the controller 1 in response to an operation command received by the controller, the drive mechanism 2 pushes the insulating rod 5 upward, which in turn pushes the moving conductor 6 upward. This closes the gap in the vacuum interrupter 7, and the circuit breaker closes. When the drive mechanism 2 performs an opening operation under the control of the controller 1 in response to an operation command received by the controller, the drive mechanism 2 pulls the insulating rod 5 downward, which in turn pulls the moving conductor 6 downward. This opens the gap in the vacuum interrupter 7, and the circuit breaker opens.

[0024] The main cable 9 is connected to the moving end conductor 6. The main circuit current flows through the moving end conductor 6, the vacuum interrupter 7, and flows out from the static end conductor 8. A current sensor 3 is provided on the main cable 9 to transmit the detected current parameters to the controller 1. Figure 2 .

[0025] Reference Figure 2 When the controller 1 receives the operation instruction, the controller 1 analyzes and judges the input main circuit current value. When the main circuit current value is less than the set value N, the controller 1 inputs a small value tripping control current to the drive mechanism 2 of the circuit breaker. At this time, the drive mechanism 2 drives the circuit breaker to perform a slow tripping movement; when the main circuit current value is greater than or equal to the set value N, the controller 1 inputs a large value tripping control current to the drive mechanism 2 of the circuit breaker. At this time, the drive mechanism 2 drives the circuit breaker to perform a fast tripping movement.

[0026] Reference Figure 3 and Figure 4A speed-adjustable vacuum circuit breaker, wherein the driving mechanism 2 is a bistable permanent magnet mechanism, which includes a moving iron core 21, a closing coil 22, an opening coil 23, a permanent magnet 24, a magnetic ring 25, an upper yoke 26, and a lower yoke 27. When the closing coil 22 is input to control the current, the magnetic lines of force W1 generated by the closing coil 22 pass through the magnetic ring 25, the moving iron core 21, the upper yoke 26, and the lower yoke 27, generating an upward suction force to drive the moving iron core 21 upward. When the moving iron core 21 moves to the mating surface of the upper yoke 26, the moving iron core 21 is maintained in the closing position under the magnetic force of the permanent magnet 24; when the opening coil 23 is input to control the current, the magnetic lines of force W2 generated by the opening coil 23 pass through the magnetic ring 25, the moving iron core 21, and the lower yoke 27, generating a downward suction force to drive the moving iron core 21 downward. When the moving iron core 21 moves to the mating surface of the lower yoke 27, the moving iron core 21 is maintained in the opening position under the magnetic force of the permanent magnet 24. When the input closing coil 22 is a small control current, the moving iron core 21 moves upward slowly due to the electromagnetic force of the closing coil 22. When the input closing coil 22 is a large control current, the moving iron core 21 moves upward quickly due to the electromagnetic force of the closing coil 22. When the input opening coil 23 is a small control current, the moving iron core 21 moves downward slowly due to the electromagnetic force of the opening coil 23. When the input opening coil 23 is a large control current, the moving iron core 21 moves downward quickly due to the electromagnetic force of the opening coil 23.

[0027] Reference Figure 1 and Figure 2 In some embodiments, a speed-adjustable vacuum circuit breaker can control the slow closing movement or fast closing movement of the circuit breaker by directly setting the parameters of the controller 1, combining the operating instructions received by the controller 1, and inputting a small control current or a large control current to the closing coil 22 of the drive mechanism 2; it can also control the slow opening movement or fast opening movement of the circuit breaker by directly setting the parameters of the controller 1, combining the operating instructions received by the controller 1, and inputting a small control current or a large control current to the opening coil 23 of the drive mechanism 2.

[0028] Reference Figure 1 and Figure 2 A speed-adjustable vacuum circuit breaker. When the current sensor 3 detects that the main circuit current value through the main cable 9 is less than the set value of 1000A, the controller 1 inputs a small-value tripping control current to the drive mechanism 2 of the circuit breaker. At this time, the drive mechanism 2 drives the circuit breaker to perform a slow tripping movement. When the current sensor 3 detects that the main circuit current value through the main cable 9 is greater than or equal to the set value of 1000A, the controller 1 inputs a large-value tripping control current to the drive mechanism 2 of the circuit breaker. At this time, the drive mechanism 2 drives the circuit breaker to perform a fast tripping movement.

[0029] Implementation Principle: Current sensor 3, located at the input end of main cable 9, monitors the main circuit current in real time and transmits the current value to controller 1. This design enables the circuit breaker to operate based on the actual current value, improving operational accuracy and safety. Based on the current value transmitted by current sensor 3, controller 1 inputs different trip control currents to drive mechanism 2. When the current value is less than the set value N, controller 1 inputs a small trip control current, driving the circuit breaker to open slowly. When the current value is greater than or equal to the set value N, controller 1 inputs a large trip control current, driving the circuit breaker to open quickly. This design enables the circuit breaker to automatically adjust the opening speed according to the current, thereby improving the adaptability and flexibility of the circuit breaker. The drive mechanism 2 is controlled by the controller 1 and can automatically adjust the opening speed according to the current, thereby avoiding the tedious operation of manually adjusting the opening speed under different current conditions in traditional circuit breakers, thereby improving the efficiency and convenience of operation. The setting of the bistable permanent magnet mechanism utilizes the interaction between the permanent magnet 24 and the coil, so that the drive mechanism 2 can switch between two stable states, thereby improving the reliability and stability of the circuit breaker. By controlling the current of the closing coil 22 and the opening coil 23, the movement speed of the moving iron core 21 can be accurately controlled. This design enables the circuit breaker to adjust the opening and closing speeds according to actual needs, thereby improving the flexibility and adaptability of operation. Through the cooperation of the current sensor 3 and the controller 1, the drive mechanism 2 can respond in time when the current is abnormal, thereby reducing equipment damage or safety accidents caused by excessive current, thereby significantly improving the safety of the system.

Claims

1. A speed-adjustable vacuum circuit breaker, characterized in that: The invention comprises a controller (1), a driving mechanism (2), a current sensor (3), a supporting insulator (4), an insulating pull rod (5), a moving end conductor (6), a vacuum arc extinguishing chamber (7), a static end conductor (8), and a main cable (9), wherein the current sensor (3) is arranged at the input end of the main cable (9), the vacuum arc extinguishing chamber (7) is arranged at one end of the supporting insulator (4), the driving mechanism (2) and the current sensor (3) are both electrically connected to the controller (1), the main cable (9) extends into the supporting insulator (4) and is connected to the moving end conductor (6), one end of the moving end conductor (6) extends into the vacuum arc extinguishing chamber (7), and one end of the insulating pull rod (5) is connected to the supporting insulator (4) is connected to the moving end conductor (6) in the inner cavity, the driving mechanism (2) is controlled by the controller (1) to drive the insulating pull rod (5) to move back and forth along the inner cavity of the supporting insulator (4), the insulating pull rod (5) drives the moving end conductor (6) to move back and forth in the vacuum arc extinguishing chamber (7), one end of the static end conductor (8) also extends into the vacuum arc extinguishing chamber (7) and is located in the moving track of the end of the moving end conductor (6), the controller (1); when the main circuit current of the circuit breaker passes through the main cable (9), the current sensor (3) transmits the detected main circuit current value to the controller (1), and after receiving the opening operation instruction, the controller (1) analyzes and judges the input main circuit current value, When the main circuit current value is less than the set value N, the controller (1) inputs a small value opening control current to the driving mechanism (2) of the circuit breaker, and the driving mechanism (2) drives the circuit breaker to perform a slow opening movement; when the main circuit current value is greater than or equal to the set value N, the controller (1) inputs a large value opening control current to the driving mechanism (2) of the circuit breaker, and the driving mechanism (2) drives the circuit breaker to perform a fast opening movement, wherein the driving mechanism (2) is a bistable permanent magnet mechanism, which includes a moving iron core (21), a closing coil (22), an opening coil (23), a permanent magnet (24), a magnetic ring (25), an upper yoke (26), and a lower yoke (27), wherein the upper yoke (26) and the lower yoke (27) are relatively The movable iron core (21) is arranged between the upper yoke (26) and the lower yoke (27) and has both ends extending therethrough; the permanent magnet (24) is arranged between the upper yoke (26) and the lower yoke (27); the closing coil (22) and the opening coil (23) are wound around the outer periphery of the permanent magnet (24); the magnetic conductive ring (25) is arranged between the closing coil (22) and the opening coil (23); and the movable iron core (21) moves upward slowly when the input closing coil (22) is a small value control current, and moves upward quickly when the input closing coil (22) is a large value control current.When the input trip coil (23) is a small control current, the moving iron core (21) is subjected to the electromagnetic force of the trip coil (23) and moves downward slowly. When the input trip coil (23) is a large control current, the moving iron core (21) is subjected to the electromagnetic force of the trip coil (23) and moves downward quickly.

2. The adjustable speed vacuum circuit breaker according to claim 1, characterized in that: By directly setting the parameters of the controller (1), the controller (1) is set to input a small control current to the closing coil (22) of the driving mechanism (2) to control the slow closing movement of the circuit breaker; by directly setting the parameters of the controller (1), the controller (1) is set to input a large control current to the closing coil (22) of the driving mechanism (2) to control the fast closing movement of the circuit breaker.

3. The adjustable speed vacuum circuit breaker according to claim 1, characterized in that: By directly setting the parameters of the controller (1), the controller (1) is set to input a small control current to the opening coil (23) of the driving mechanism (2) to control the slow opening movement of the circuit breaker; by directly setting the parameters of the controller (1), the controller (1) is set to input a large control current to the opening coil (23) of the driving mechanism (2) to control the fast opening movement of the circuit breaker.

4. The adjustable speed vacuum circuit breaker according to claim 1, characterized in that: When the current sensor (3) detects that the main circuit current value through the main cable (9) is less than the set value 1000A, the controller (1) inputs a small value opening control current to the driving mechanism (2) of the circuit breaker, and at this time the driving mechanism (2) drives the circuit breaker to perform a slow opening movement; when the current sensor (3) detects that the main circuit current value through the main cable (9) is greater than or equal to the set value 1000A, the controller (1) inputs a large value opening control current to the driving mechanism (2) of the circuit breaker, and at this time the driving mechanism (2) drives the circuit breaker to perform a fast opening movement.

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