Magnetic quenching control device and method and circuit breaker

Abstract

The invention discloses a magnetic blow-out arc extinguishing control device and method and a circuit breaker. The device comprises a main control module, a power supply module, a magnetic blow-out device and a switch module which are arranged in the circuit breaker. The switch module is respectively connected with a moving contact of the circuit breaker and one power supply end of an external power supply, the moving contact is movably connected with a static contact, the static contact is connected with the other power supply end of the external power supply, and the switch module is used for controlling the on-off state between the moving contact and the external power supply; the power supply module is respectively connected with the main control module and an external power supply and is used for converting the external power supply into a direct-current power supply and outputting the direct-current power supply to the main control module to supply power to the main control module; the main control module is connected with the switch module, the magnetic blow-out device and the gate switch, and is used for controlling the magnetic blow-out device to work according to the switching signal of the gate switch, and controlling the on-off state of the switch module in a delayed manner, thereby controlling the on-off operation of the circuit breaker. Arc extinguishing work can be started before the circuit breaker is switched on / off, and the arc extinguishing efficiency and effect are good.

Description

Technical Field

[0001] The present invention relates to the technical field of arc extinguishing, and in particular to a magnetic blowout arc extinguishing control device, method and circuit breaker. Background Art

[0002] In power systems, circuit breakers are critical protective devices, used to cut off current in abnormal situations to protect circuits and equipment. Traditional circuit breakers often generate arcs when interrupting high AC currents. This arcing not only causes contact material loss but can also cause electromagnetic interference and overvoltage issues.

[0003] Current magnetic blowout circuit breakers are equipped with a magnetic blowout device in series. When the device opens, the fault current flows through the magnetic blowout coil in the device, generating a magnetic field that is positively correlated with the current intensity. This magnetic field acts on the arc through the Lorentz force (the force generated by the interaction of current and magnetic field), forcing the arc to disperse outward, thus achieving the arc extinguishing function. However, current magnetic blowout devices only start magnetic blowout after the arc is generated. As a result, the arc has already been generated for some time by the time the magnetic blowout takes effect, making it impossible to quickly extinguish the arc, resulting in poor arc extinguishing effect. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a magnetic blow-out arc extinguishing control device, method and circuit breaker, which can realize gas blow-out arc extinguishing operation with high arc extinguishing efficiency and improve the reliability and safety of the circuit breaker.

[0005] In order to solve the above technical problems, the present invention provides a magnetic blowout arc extinguishing control device, comprising a main control module, a power supply module, a magnetic blowout device and a switch module arranged in a circuit breaker; the switch module is respectively connected to the moving contact of the circuit breaker and one power extreme of an external power supply, the moving contact is movably connected to the static contact, and the static contact is connected to the other power extreme of the external power supply, and the switch module is used to control the on-off state between the moving contact and the external power supply; the power supply module is respectively connected to the main control module and the external power supply, and is used to convert the external power supply into a DC power supply and output it to the main control module to power the main control module; the main control module is respectively connected to the switch module, the magnetic blowout device and the gate switch, and is used to control the operation of the magnetic blowout device according to the switching signal of the gate switch, and delay control of the on-off state of the switch module, thereby controlling the switching operation of the circuit breaker.

[0006] As an improvement of the above scheme, the main control module includes a controller and a timer, and the controller is respectively connected to the power supply module, switch module, magnetic blowing device and gate switch; the controller is also connected to the timer, and is used to control the timing of the timer according to the switching signal of the gate switch and receive the delay signal returned by the timer, thereby controlling the working state of the switch module according to the delay signal.

[0007] As an improvement to the above scheme, the 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 input AC power supply into a 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 power supply and output it to the main control module to power the main control module.

[0008] As an improvement of the above scheme, the control end of the switch module is connected to the main control module, and the two connection ends of the switch module are respectively connected to one end of the moving and static heads and one power extreme end of the external power supply, and are used to control the on and off state between the moving contact and the external power supply according to the control signal output by the controller.

[0009] As an improvement to the above solution, the switch module is a MOS tube.

[0010] As an improvement to the above solution, the switch module is a relay.

[0011] As an improvement to the above solution, the controller includes an MCU module.

[0012] The present invention also discloses a magnetic blowout arc extinguishing control method, which is applied to the above-mentioned magnetic blowout arc extinguishing control device, and the method includes: obtaining a gate switch signal of a circuit breaker; controlling the magnetic blowout device to perform magnetic blowout operation according to the gate switch signal, and timing to obtain a first delay time; judging whether the first delay time reaches a first preset delay threshold, and if so, driving the switch module to control the on-off state between the moving contact and the external power supply, thereby controlling the switch operation of the circuit breaker, and timing to obtain a second delay time; judging whether the second delay time reaches a second preset delay threshold, and if so, controlling the magnetic blowout device to stop working.

[0013] As an improvement to the above scheme, it also includes: obtaining a first delay time setting value and a second delay time setting value input by the user, and using the first delay time setting value as a first preset delay threshold and using the second delay time setting value as a second preset delay threshold; wherein, the second preset delay threshold is greater than the first delay time threshold.

[0014] The present invention also discloses a circuit breaker, comprising a circuit breaker body and the above-mentioned magnetic arc extinguishing control device, wherein the magnetic arc extinguishing control device is arranged in the circuit breaker body, and the main control module in the magnetic arc extinguishing control device implements the steps of the above-mentioned magnetic arc extinguishing control method when executing the computer program.

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

[0016] The present invention can control the magnetic blowing device to perform magnetic blowing in advance according to the switching signal of the gate switch of the circuit breaker, thereby improving the arc extinguishing effect and efficiency, and drive the switch module to control the on-off state between the moving contact and the external power supply after a predetermined delay time, thereby controlling the switching operation of the circuit breaker, and then automatically realizing the opening / closing and opening / closing arc extinguishing functions of the circuit breaker through a soft connection control method, with good arc extinguishing efficiency and effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the magnetic blowout arc control device of the present invention;

[0018] Figure 2 This is a structural diagram of the practical main control module;

[0019] Figure 3 It is a structural diagram of the switch module of the present invention;

[0020] Figure 4 It is a structural diagram of the power supply module of the present invention;

[0021] Figure 5 It is a flow chart of the magnetic blowout arc control method of the present invention. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that any directional terms such as "up," "down," "left," "right," "front," "back," "inside," and "outside" that appear or will appear herein are based solely on the accompanying drawings and are not intended to limit the present invention.

[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 being referred to. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0024] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or mutual communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0025] like Figure 1 As shown, the present invention provides a magnetic blowout arc extinguishing control device, comprising a main control module 1, a power supply module 2, a magnetic blowout device 3, and a switch module 4, which are disposed in a circuit breaker. The switch module 4 is respectively connected to the circuit breaker's movable contact 5 and one power supply terminal of an external power supply 6. The movable contact 5 is movably connected to a stationary contact 7, which is connected to the other power supply terminal of the external power supply 6. The switch module 4 is used to control the on / off state between the movable contact 5 and the external power supply 6, thereby controlling the contact or separation of the movable contact 5 and the stationary contact 7, thereby realizing the on / off state of the circuit breaker. The external power supply 6 is an AC power supply.

[0026] The power supply module 2 is connected to the main control module 1 and the external power supply 6 respectively, and is used to convert the external power supply 6 into a DC power supply and output it to the main control module 1 to power the main control module 1 and ensure the stable operation of the main control module 1. The main control module 1 is connected to the switch module 4, the magnetic blowing device 3 and the gate switch 8 respectively, and is used to control the magnetic blowing device 3 to perform magnetic blowing according to the switch signal (such as the level change signal) input by the gate switch 8, and drive the switch module 4 to control the on / off state between the moving contact 5 and the external power supply 6 after a predetermined delay time, thereby controlling the contact or separation of the moving contact 5 and the static contact 7, and then controlling the opening / closing operation of the circuit breaker. At this time, when the circuit breaker is opened / closed, the arc that may be generated will be quickly extinguished by the magnetic blowing device 3 that has already been working, thereby improving the arc extinguishing efficiency and effect.

[0027] For example, when the circuit breaker is in closed operation and the user operates the gate switch 8 to open the gate, a corresponding opening signal will be triggered to the main control module 1, such as a conventional push-button switch circuit. When the push-button switch is disconnected, a high / low level signal will be triggered to the main control module 1, etc.; when the main control module 1 receives the opening signal, it first sends a trigger signal to control the magnetic blowing device 3 to perform magnetic blowing at the position of the moving contact 5 and the static contact 7, and then sends a control signal after a predetermined delay to drive the switch module 4 to disconnect, so that the moving contact 5 is disconnected from the external power supply 6. At this time, the moving contact 5 will be separated from the static contact 7, the circuit will be disconnected, and an arc may be generated between the moving contact 5 and the static contact 7. The magnetic blowing device 3, which has been in working state for a long time, will quickly extinguish the arc, thereby improving the arc extinguishing efficiency and effect. Accordingly, when the circuit breaker is in the disconnected state and the user operates the gate switch 8 to close the gate, a corresponding closing signal will be triggered to the main control module 1. The main control module 1 first controls the magnetic blowing device 3 to operate according to the closing signal, and then sends a control signal to drive the switch module 4 to close after a predetermined delay, so that the moving contact 5 is closed to the external power supply 6. At this time, the moving contact 5 will contact the static contact 7, and the circuit will be conductive. An arc may be generated between the moving contact 5 and the static contact 7. The magnetic blowing device 3, which has already been in the working state, will quickly extinguish the arc, thereby improving the arc extinguishing efficiency and effect. Therefore, the present invention can automatically realize the opening / closing and opening / closing arc extinguishing functions of the circuit breaker through the soft connection control method, with good arc extinguishing efficiency and effect, and the overall operation and structure are simple and low cost.

[0028] Specifically, if Figures 1 to 2 As shown, the main control module 1 includes a controller 11 and a timer 12. The controller 11 is respectively connected to the power supply module 2, the switch module 4, the magnetic blowout device 3, and the gate switch 8; the controller 11 is also connected to the timer 12. When the controller 11 receives an on / off signal from the gate switch 8, it controls the operation of the magnetic blowout device 3 and the start of the timing operation of the timer 12 to obtain the required delay signal. When the delay time reaches the predetermined delay time, the controller 11 controls the on / off state of the switch module 4 according to the delay signal returned by the timer, thereby controlling the on / off state between the moving contact 5 and the external power supply 6, thereby controlling the on / off state of the circuit breaker, realizing the circuit breaker on / off and on / off arc extinguishing functions.

[0029] Secondly, when the circuit breaker performs the arc extinguishing operation by opening / closing the switch, that is, when the controller 11 controls the on / off state of the switch module 4, it also controls the timer 12 to perform arc extinguishing timing to obtain the arc extinguishing working time; when the arc extinguishing working time reaches the preset arc extinguishing time, it means that the generated arc has been completely processed, and at this time the magnetic blowing device 3 is controlled to stop working.

[0030] Preferably, the controller 11 includes an MCU module.

[0031] Preferably, in other embodiments, the timer 12 may be a timing device built into the MCU module to further reduce the device structure and cost.

[0032] Further, if Figure 1 and Figure 3 As shown, the control end of the switch module 4 is connected to the main control module 1, and the two connection ends of the switch module 4 are respectively connected to one end of the movable and static heads and one power extreme end of the external power supply 6, and are used to control the on-off state between the movable contact 5 and the external power supply 6 according to the control signal output by the controller 11. For example, when the controller 11 receives the opening signal of the gate switch 8, the controller 11 sends a control signal to the control end of the switch module 4 after a delay, so that the switch module 4 is turned off, and the movable contact 5 is disconnected from the external power supply 6, realizing the circuit breaker opening function. Correspondingly, when the controller 11 receives the closing signal of the gate switch 8, it can control the switch module 4 to conduct after a delay, so that the movable contact 5 is connected to the external power supply 6, realizing the circuit breaker opening function.

[0033] In this embodiment, the switch module 4 is preferably a relay 41. The controller 11 sends a control signal to control the relay 41 to operate, thereby connecting or disconnecting the movable contact 5 from the external power supply 6. In other embodiments, other switch modules 4 with circuit on / off control functions, such as MOS transistors, can be selected according to actual needs, and this is not too restrictive.

[0034] Further, if Figure 1 and Figure 4 As shown, the power supply module 2 includes a rectifier module 21 and a step-down module 22. The rectifier module 21 is connected to the external power supply 6 and the step-down module 22, and is used to rectify the external AC power input into a DC power supply and output it to the step-down module 22. The step-down module 22 is connected to the main control module 1, and is used to step down the DC power supply into a DC power supply and output it to the main control module 1 to power the main control module 1 and ensure stable power-on operation of the main control module 1. Among them, the rectifier module 21 and the step-down module 22 used are both existing technologies, and the specific structure and working principle of the rectifier module 21 and the step-down module 22 will not be further described here.

[0035] like Figure 5 As shown, the present invention also discloses a magnetic blowout arc control method, which is applied to the above-mentioned magnetic blowout arc control device, and the method includes:

[0036] S101, obtaining a gate switch signal of a circuit breaker;

[0037] It should be noted that when the user operates the gate switch on the circuit breaker, such as controlling the gate switch to open or close, the main control module will obtain the corresponding gate switch signal, such as an opening signal or a closing signal.

[0038] S102, controlling the magnetic blowing device to perform magnetic blowing according to the gate switch signal, and timing to obtain a first delay time;

[0039] It should be noted that when the main control module receives an opening signal or a closing signal, it will send a trigger signal to control the operation of the magnetic blowing device and perform a first delay time to stagger the magnetic blowing operation and the opening or closing operation, so as to achieve timely arc extinguishing of the arc that may be generated when opening or closing the gate, thereby improving the arc extinguishing efficiency and effect.

[0040] S103, determining whether the first delay time reaches a first preset delay threshold; if so, driving the switch module to control the on / off state between the moving contact and the external power supply, thereby controlling the on / off operation of the circuit breaker, and timing to obtain a second delay time;

[0041] It should be noted that when the first delay time reaches the first preset delay threshold, the main control module drives the switch module to control the on / off state between the moving contact and the external power supply, thereby controlling the on / off operation of the circuit breaker. For example, when closing the circuit breaker, the main control module drives the switch module to conduct, so that the moving contact is connected to the external power supply and the moving contact contacts the static contact, achieving the circuit breaker closing operation. For example, when opening the circuit breaker, the main control module drives the switch module to disconnect, so that the moving contact is disconnected from the external power supply and the moving contact separates from the static contact, achieving the circuit breaker opening operation. At this time, when the circuit breaker is just opening or closing, an arc may be generated between the moving contact and the static contact. By controlling the magnetic blowing device to be in an active state in advance, the generated arc can be quickly extinguished, thereby improving arc extinguishing efficiency and arc extinguishing effect. At the same time, the main control module also resets the time to obtain a second delay time to prevent the magnetic blowing device from operating for a long time and affecting the stability of the working circuit.

[0042] S014: Determine whether the second delay time reaches a second preset delay threshold; if so, control the magnetic blowing device to stop working.

[0043] It should be noted that when the second delay time reaches the second preset delay threshold, it means that the generated arc has been completely processed. At this time, the magnetic blowing device is controlled to stop working, realizing the automatic arc extinguishing function of the circuit breaker opening / closing, and the arc extinguishing effect is good.

[0044] Specifically, the method of the present invention also includes: obtaining a first delay time setting value and a second delay time setting value input by the user, and using the first delay time setting value as a first preset delay threshold and using the second delay time setting value as a second preset delay threshold; in this way, the user can adjust the first delay time threshold according to actual conditions (such as circuit breakers of different types or performances) to ensure that before actually opening / closing the switch, the magnetic blowing device can be controlled to enter the optimal magnetic blowing working state, thereby improving the subsequent arc extinguishing effect; and adjusting the second preset delay threshold to ensure that the magnetic blowing device operates stably to effectively complete the arc extinguishing work.

[0045] The second preset delay threshold is greater than the first delay time threshold to ensure that the magnetic blowing device can completely extinguish the generated arc and improve the arc extinguishing effect.

[0046] The present invention also discloses a circuit breaker, comprising a circuit breaker body and the above-mentioned magnetic arc extinguishing control device, wherein the magnetic arc extinguishing control device is arranged in the circuit breaker body, and the main control module in the magnetic arc extinguishing control device implements the steps of the above-mentioned magnetic arc extinguishing control method when executing the computer program.

[0047] To sum up, the present invention can control the magnetic blowing device to perform magnetic blowing in advance according to the switching signal of the gate switch of the circuit breaker, thereby improving the arc extinguishing effect and efficiency, and drive the switch module to control the on-off state between the moving contact and the external power supply after a predetermined delay time, thereby controlling the switching operation of the circuit breaker, and then automatically realizing the opening / closing and opening / closing arc extinguishing functions of the circuit breaker through soft connection control, with good arc extinguishing efficiency and effect.

[0048] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed by the present invention, or replace some of the technical features therein with equivalents. Such modifications, changes, or replacements do not deviate from the essence of the corresponding technical solutions within the scope of the technical solutions of the embodiments of the present invention, and should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A magnetic blowout arc control device, characterized in that: It includes a main control module, a power supply module, a magnetic blow device and a switch module arranged in the circuit breaker; The switch module is respectively connected to the moving contact of the circuit breaker and one power terminal of the external power supply, the moving contact is movably connected to the static contact, and the static contact is connected to the other power terminal of the external power supply. The switch module is used to control the on-off state between the moving contact and the external power supply; The power supply module is connected to the main control module and the external power supply respectively, and is used to convert the external power supply into a DC power supply and output it to the main control module to power the main control module; The main control module is connected to the switch module, magnetic blowing device and gate switch respectively, and is used to control the operation of the magnetic blowing device according to the switching signal of the gate switch, and delay control the on and off state of the switch module, thereby controlling the on and off operation of the circuit breaker.

2. The magnetic blowout arc control device according to claim 1, characterized in that: The main control module includes a controller and a timer, and the controller is connected to the power supply module, the switch module, the magnetic blowing device and the gate switch respectively; The controller is also connected to the timer, and is used to control the timing of the timer according to the switching signal of the gate switch and receive the delay signal returned by the timer, thereby controlling the working state of the switch module according to the delay signal.

3. The magnetic blowout arc control device according to claim 1, characterized in that: The 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 input AC power into a DC power supply and output it to the step-down module; The voltage reduction module is connected to the main control module and is used to reduce the voltage of the DC power supply into a DC power supply and output the DC power supply to the main control module to supply power to the main control module.

4. The magnetic blowout arc control device according to claim 1, characterized in that: The control end of the switch module is connected to the main control module, and the two connection ends of the switch module are respectively connected to one end of the moving and static heads and one power extreme end of the external power supply, and are used to control the on and off state between the moving contact and the external power supply according to the control signal output by the controller.

5. The magnetic blowout arc control device according to claim 4, characterized in that: The switch module is a MOS tube.

6. The magnetic blowout arc control device according to claim 4, characterized in that: The switch module is a relay.

7. The magnetic blowout arc control device according to claim 2, characterized in that: The controller includes an MCU module.

8. A magnetic blowout arc control method, characterized in that: The method is applied to the magnetic blowout arc control device according to claims 1 to 7, and the method comprises: Get the gate switch signal of the circuit breaker; controlling the magnetic blowing device to perform magnetic blowing according to the gate switch signal, and performing timing to obtain a first delay time; determining whether the first delay time reaches a first preset delay threshold; if so, driving the switch module to control the on / off state between the moving contact and the external power supply, thereby controlling the on / off operation of the circuit breaker, and timing to obtain a second delay time; It is determined whether the second delay time reaches a second preset delay threshold. If so, the magnetic blowing device is controlled to stop working.

9. The magnetic blowout arc control method according to claim 8, characterized in that: Also includes: Obtaining a first delay time setting value and a second delay time setting value input by a user, and using the first delay time setting value as a first preset delay threshold and the second delay time setting value as a second preset delay threshold; The second preset delay threshold is greater than the first delay time threshold.

10. A circuit breaker, characterized in that: The invention comprises a circuit breaker body and a magnetic arc extinguishing control device according to any one of claims 1 to 7, wherein the magnetic arc extinguishing control device is arranged in the circuit breaker body, and the main control module in the magnetic arc extinguishing control device implements the steps of the magnetic arc extinguishing control method according to any one of claims 8 to 9 when executing the computer program.

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