A magnetic arc extinguishing device and circuit breaker based on arc and zero-crossing detection

Abstract

The utility model discloses a kind of magnetic blow arc extinguishing device and circuit breaker based on arc and zero-crossing detection, the device includes including processor, magnetic blow device, current sensor and gate switch module;Current sensor is arranged on the connection line of any contact of circuit breaker, and current sensor is connected with processor;Gate switch module is connected with movable contact of circuit breaker, for driving movable contact of circuit breaker and static contact contact or separate;Processor is connected with gate switch module and magnetic blow device respectively, for arc detection and zero-crossing detection according to current data, and according to detection result, control magnetic blow device works in advance, then control gate switch module opens gate work.The utility model can carry out magnetic blow arc extinguishing work in advance before gate work, and circuit breaker can be controlled to open gate work at zero-crossing moment, improve arc extinguishing efficiency and service life of circuit breaker.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a magnetic blowout arc extinguishing device and circuit breaker based on arc and zero-crossing point detection. Background Technology

[0002] In power systems, circuit breakers are critical protective devices used to interrupt current in abnormal situations to protect circuits and equipment. Traditional circuit breakers often generate electric arcs when interrupting large alternating currents. These arcs not only cause wear and tear on the contact materials but can also lead to electromagnetic interference and overvoltage problems.

[0003] Current magnetic blowout circuit breakers incorporate a magnetic blowout device in series. When the circuit breaker trips, the fault current flows through the magnetic blowout coil, generating a magnetic field positively correlated with the current intensity. This magnetic field exerts a Lorentz force (the force generated by the interaction of current and magnetic field) on the arc, forcing it to disperse outwards, thus achieving the magnetic blowout extinguishing function. However, current magnetic blowout circuit breakers only trigger the magnetic blowout operation after the opening arc has occurred. This means that by the time the magnetic blowout takes effect, the opening arc has already been running for some time, and by then it is quite intense, requiring a longer extinguishing time. This reduces the contact life of the circuit breaker, thereby affecting its overall service life. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a magnetic blowout arc extinguishing device and circuit breaker based on arc and zero-crossing point detection, which can perform magnetic blowout arc extinguishing in advance before the circuit breaker opens, and can control the circuit breaker to open at the zero-crossing point, thereby improving the arc extinguishing efficiency and the service life of the circuit breaker.

[0005] To address the aforementioned technical problems, this utility model provides a magnetic blowout arc extinguishing device based on arc and zero-crossing point detection, comprising a processor, a magnetic blowout device, a current sensor, and a gate switch module. The current sensor is installed on the connection line of any contact of the circuit breaker and is connected to the processor to collect current data on the connection line and send the current data to the processor. The gate switch module is connected to the moving contact of the circuit breaker and is used to drive the moving contact of the circuit breaker to contact or separate from the stationary contact. The processor is connected to both the gate switch module and the magnetic blowout device and is used to perform arc detection and zero-crossing point detection based on the current data. Based on the arc detection result, it sends a magnetic blowout control signal to the magnetic blowout device to start working in advance, and after a delay until the next zero point, it sends a gate control signal to the gate switch module to drive the gate switch module to open.

[0006] As an improvement to the above solution, the processor includes a main control module and a zero-crossing detection module, wherein the zero-crossing detection module is connected to the main control module and the current sensor respectively.

[0007] As an improvement to the above solution, the gate switch module includes a switch module and an operating mechanism of the circuit breaker: the switch module is connected to the processor and the operating mechanism respectively, and the switch module sends a drive signal to the operating mechanism according to the gate control signal, so as to drive the moving contact of the circuit breaker to separate from the stationary contact.

[0008] As an improvement to the above solution, the switching module includes a switching transistor or a relay.

[0009] As an improvement to the above solution, a voltage regulator module is also included. The voltage regulator module is connected to the processor and the external power supply respectively, and is used to convert the external power supply into DC operating power and output it to the processor to power the processor.

[0010] As an improvement to the above solution, the voltage regulation power supply module includes a rectifier module and a step-down module. The rectifier module is connected to the external power supply and the step-down module, and is used to rectify the external AC power supply into DC power supply and output it to the step-down module. The step-down module is connected to the main control module and is used to step down the DC power supply into DC working power supply and output it to the processor to power the processor.

[0011] As an improvement to the above solution, the current sensor is a current transformer, and the wires of the connecting line pass through the circular hole of the current transformer.

[0012] As an improvement to the above solution, the main control module includes a timer.

[0013] As an improvement to the above solution, the main control module is an MCU module.

[0014] This utility model provides a circuit breaker, including a circuit breaker body and the aforementioned magnetic blowout arc extinguishing device, wherein the magnetic blowout arc extinguishing device is disposed in the circuit breaker body.

[0015] The present invention has the following beneficial effects:

[0016] This invention can determine the arc and zero-crossing point status in real time based on the current data in the circuit. When an abnormal arc occurs in the circuit, the processor can control the magnetic blow-out device to perform magnetic blow-out arc extinguishing in advance, and control the gate switch module to work at the next zero-crossing point, automatically realizing the circuit breaker's zero-crossing opening operation, thereby improving the arc extinguishing efficiency, reducing the arc duration between contacts, extending the service life of moving and stationary contacts, and thus improving the service life of the circuit breaker. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the first embodiment of the magnetic blowout arc extinguishing device based on arc and zero-crossing detection of this utility model;

[0018] Figure 2 This is a schematic diagram of the processor of this utility model;

[0019] Figure 3 This is a schematic diagram of the gate switch module of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the second embodiment of the magnetic blowout arc extinguishing device based on arc and zero-crossing point detection of this utility model;

[0021] Figure 5 This is a structural schematic diagram of the voltage stabilization power supply module of this utility model. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the following will describe this utility model in further detail with reference to the accompanying drawings. It is hereby declared that any use of terms such as "up," "down," "left," "right," "front," "back," "inner," and "outer" in this document is based solely on the accompanying drawings and is not intended to limit the scope of this utility model.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] like Figure 1 As shown, Figure 1The diagram shows a first embodiment of a magnetic blowout arc extinguishing device based on arc and zero-crossing detection according to the present invention. It includes a processor 1, a magnetic blowout device 2, a current sensor 3, and a gate switch module 4. The current sensor 3 is installed on the connection line of the stationary contact 5 of the circuit breaker. The current sensor 3 is connected to the processor 1 and is used to collect current data on the connection line and send the current data to the processor 1.

[0026] The gate switch module 4 is connected to the moving contact 6 of the circuit breaker and is used to drive the moving contact 6 of the circuit breaker to contact or separate from the stationary contact 5. The processor 1 is connected to the gate switch module 4 and the magnetic blow-out device 2 respectively and is used to perform arc detection and zero-crossing detection based on the current data to obtain arc detection results and zero-crossing signals. When the arc detection result is abnormal, it indicates that an abnormal arc has occurred in the circuit. At this time, the processor 1 can send a magnetic blow-out control signal to the magnetic blow-out device 2 according to the abnormal situation, so that the magnetic blow-out device 2 can start working in advance. Moreover, the processor 1 can determine the next zero-crossing time based on the zero-crossing signal, so as to send a gate control signal to the gate switch module 4 at the next zero-crossing time to drive the gate switch module 4 to open at the zero-crossing time, thereby reducing the arc intensity generated when opening. At the same time, the fully opened magnetic blow-out device 2 performs rapid arc extinguishing, which can improve the arc extinguishing efficiency, reduce the arc duration between contacts, extend the service life of the moving and stationary contacts, and thus improve the service life of the circuit breaker. Moreover, the operation is simple. In addition, since the electric arc energy is lowest at the zero point, this invention can significantly reduce the probability of contact metal evaporation and welding by precisely controlling the circuit breaker to open at the zero point, thereby further improving the mechanical life of the circuit breaker and meeting users' demand for long service life of the circuit breaker.

[0027] It should be noted that processor 1 can perform arc feature analysis and extraction on the acquired current signal and determine whether an arc fault has occurred. When an abnormal arc is detected in the circuit, a magnetic blow-out control signal can be issued to control the operation of magnetic blow-out device 2. The arc feature analysis and extraction method used is an existing arc detection algorithm, which is existing technology and will not be described in detail here.

[0028] Furthermore, such as Figures 1 to 2 As shown, the processor 1 includes a main control module 11 and a zero-crossing detection module 12. The zero-crossing detection module 12 is connected to both the main control module 11 and the current sensor 3. The zero-crossing detection module 12 detects zero-crossing signals and sends them to the processor 1, which then determines the next zero-crossing time based on the signal and performs zero-crossing gate opening. The zero-crossing detection module 12 is existing technology, and its hardware structure and detection principle will not be described in detail here.

[0029] Furthermore, such as Figure 3 As shown, the gate switch module 4 includes a switch module 41 and a circuit breaker operating mechanism 42. The switch module 41 is connected to the processor 1 and the operating mechanism 42 respectively. The switch module 41 sends a drive signal to the operating mechanism 42 according to the gate control signal, so that the operating mechanism 42 drives the moving contact 6 of the circuit breaker to separate from the stationary contact 5. The automatic gate opening function is realized through soft control, which is convenient to operate and has a simple structure.

[0030] Preferably, the switching module 41 includes a switching transistor or a relay, wherein the switching transistor is preferably a MOSFET, but is not limited thereto.

[0031] Furthermore, the main control module 11 includes a timer. By setting this timer, an advance time threshold can be set before the next zero crossing point. When the advance time is reached, the main control module 11 can send a magnetic blow control signal to the magnetic blow device 2 before the gate opening operation, automatically realizing the advance magnetic blow arc extinguishing operation. The main control module 11 is an MCU module.

[0032] Preferably, the current sensor 3 is a current transformer, but it is not limited thereto. By passing the wires of the connecting line through the circular hole of the current transformer, the current transformer can monitor the current data of the circuit in real time.

[0033] like Figures 4 to 5 As shown, Figures 4 to 5 This diagram shows a structural schematic of a second embodiment of a magnetic blowout arc extinguishing device based on arc and zero-crossing point detection according to the present invention. This embodiment is similar to... Figure 1 Unlike the first embodiment shown, this embodiment also includes a voltage regulator module 7, which is connected to the processor 1 and an external power supply respectively. The voltage regulator module 7 is used to convert the external power supply into DC operating power and output it to the processor 1 to provide the processor 1 with the required operating power and ensure that the processor 1 is powered on and working stably.

[0034] The voltage regulation power supply module 7 includes a rectifier module 71 and a step-down module 72. The rectifier module 71 is connected to the external power supply and the step-down module 72, and is used to rectify the external AC power supply into DC power supply and output it to the step-down module 72. The step-down module 72 is connected to the main control module 11, and is used to step down the DC power supply into DC working power supply and output it to the processor 1, so that the processor 1 can operate within a safe working voltage range and ensure the stability of the device.

[0035] This utility model provides a circuit breaker, including a circuit breaker body and the aforementioned magnetic blowout arc extinguishing device, wherein the magnetic blowout arc extinguishing device is disposed in the circuit breaker body. Since the aforementioned magnetic blowout arc extinguishing control device has the aforementioned technical effects, the circuit breaker including the aforementioned magnetic blowout arc extinguishing control device should also have the aforementioned technical effects, and will not be elaborated further here.

[0036] In summary, this invention can determine the arc and zero-crossing point status in real time based on the current data in the circuit. When an abnormal arc occurs in the circuit, the processor can control the magnetic blow-out device to perform the magnetic blow-out arc extinguishing operation in advance, and control the gate switch module to work at the next zero-crossing point, automatically realizing the circuit breaker's zero-crossing opening operation, thereby improving the arc extinguishing efficiency, reducing the arc duration between contacts, extending the service life of the moving and stationary contacts, and thus improving the service life of the circuit breaker.

[0037] Finally, it should be noted that the above-described embodiments are merely specific implementations of this utility model, used to illustrate the technical solution of this utility model, and not to limit it. The protection scope of this utility model is not limited thereto. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this utility model. These modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A magnetic blowout arc extinguishing device based on arc and zero-crossing point detection, characterized in that, Includes a processor, a magnetic blowout device, a current sensor, and a gate switch module; The current sensor is installed on the connection line of any contact of the circuit breaker. The current sensor is connected to the processor and is used to collect current data on the connection line and send the current data to the processor. The gate switch module is connected to the moving contact of the circuit breaker and is used to drive the moving contact of the circuit breaker to contact or separate from the stationary contact. The processor is connected to the gate switch module and the magnetic blow device respectively. It is used to perform arc detection and zero-crossing detection based on the current data. Based on the arc detection result, it sends a magnetic blow control signal to the magnetic blow device to start working in advance. After a delay until the next zero point, it sends a gate control signal to the gate switch module to drive the gate switch module to open the gate.

2. The magnetic blowout arc extinguishing device according to claim 1, characterized in that, The processor includes a main control module and a zero-crossing detection module, which is connected to both the main control module and the current sensor.

3. The magnetic blowout arc extinguishing device according to claim 1, characterized in that, The gate switch module includes a switch module and an operating mechanism for a circuit breaker: The switch module is connected to the processor and the operating mechanism respectively. The switch module sends a drive signal to the operating mechanism according to the gate control signal, so that the operating mechanism drives the moving contact of the circuit breaker to separate from the stationary contact.

4. The magnetic blowout arc extinguishing device according to claim 3, characterized in that, The switching module includes a switching transistor or a relay.

5. The magnetic blowout arc extinguishing device according to claim 2, characterized in that, It also includes a voltage regulator module, which is connected to the processor and an external power supply respectively, and is used to convert the external power supply into DC operating power and output it to the processor to power the processor.

6. The magnetic blowout arc extinguishing device according to claim 5, characterized in that, The voltage regulator module includes a rectifier module and a step-down module. The rectifier module is connected to the external power supply and the step-down module, and is used to rectify the external AC power supply into DC power supply and output it to the step-down module. The step-down module is connected to the main control module and is used to step down the DC power supply into a DC working power supply and output it to the processor to power the processor.

7. The magnetic blowout arc extinguishing device according to claim 1, characterized in that, The current sensor is a current transformer, and the wires of the connecting line pass through the circular hole of the current transformer.

8. The magnetic blowout arc extinguishing device according to claim 2, characterized in that, The main control module includes a timer.

9. The magnetic blowout arc extinguishing device according to claim 2 or 8, characterized in that, The main control module is an MCU module.

10. A circuit breaker, characterized in that, It includes a circuit breaker body and a magnetic blowout arc extinguishing device as described in any one of claims 1 to 9, wherein the magnetic blowout arc extinguishing device is disposed in the circuit breaker body.

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