A circuit breaker gas blowout arc extinguishing system and method
By designing the circuit breaker air blowing arc extinguishing system, using the pressure-regulating air supply device and arc extinguishing switch device, combined with signal acquisition and zero crossing detection algorithm, efficient arc extinguishing is achieved, solving the problem of low arc extinguishing efficiency of traditional circuit breakers, and improving the reliability and safety of circuit breakers.
Patent Information
- Application Number
- CN202411656054.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-04-04
AI Technical Summary
When a traditional circuit breaker is cut off, a large AC current is often accompanied by an arc, resulting in contact material loss, electromagnetic interference and overvoltage problems. How to effectively extinguish the arc has become the key to improving the performance of the circuit breaker.
A circuit breaker air blowing arc extinguishing system is designed, including a pressure-regulating gas supply device, an arc extinguishing switch device, a signal acquisition device and a main control device. By collecting circuit signals in real time, the arc extinguishing switch device is controlled using a zero-crossing point detection algorithm to spray arc extinguishing gas into the active area between the dynamic and static contacts, achieving high-precision arc extinguishing work.
Improves arc extinguishing efficiency, reduces contact wear and electromagnetic interference, thereby improving the reliability and safety of the circuit breaker.
Smart Images
Figure CN119764136A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of circuit breakers, and in particular to a circuit breaker gas blowout arc extinguishing system and method. Background Art
[0002] In the power system, the circuit breaker is a key protection device used to cut off the current in abnormal situations to protect the circuit and equipment. When traditional circuit breakers interrupt large AC currents, arcs are often generated. The arcs not only cause the loss of contact materials, but also may cause electromagnetic interference and overvoltage problems. Therefore, how to effectively extinguish the arc is the key to improving the performance of circuit breakers. Summary of the invention
[0003] The technical problem to be solved by the present invention is to provide a circuit breaker gas blowing arc extinguishing system and method, which can realize gas blowing arc extinguishing work, have high arc extinguishing efficiency, and improve the reliability and safety of the circuit breaker.
[0004] In order to solve the above technical problems, the present invention provides a circuit breaker gas blow arc extinguishing system, including a pressure regulating gas supply device, an arc extinguishing switch device, a signal acquisition device and a main control device; the pressure regulating gas supply device is connected to the air inlet end of the arc extinguishing switch device, and is used to output arc extinguishing gas to the arc extinguishing switch device; the air outlet end of the arc extinguishing switch device corresponds to the active area between the moving and static contacts of the circuit breaker, and is used to spray the arc extinguishing gas to the active area; the signal acquisition device is connected to the power supply line of the moving and static contacts, and is used to collect the voltage signal and / or current signal of the circuit breaker; the main control device is respectively connected to the signal acquisition device and the arc extinguishing switch device, and is used to control the switching state of the arc extinguishing switch device according to the voltage signal and / or current signal sent by the voltage power supply detection device.
[0005] As an improvement of the above-mentioned scheme, the pressure regulating gas supply device includes a gas storage device and a pressure regulating device, and the gas storage device stores arc extinguishing gas; the two ends of the pressure regulating device are respectively connected to the gas storage device and the arc extinguishing switch device, for adjusting the gas pressure of the arc extinguishing gas and outputting the arc extinguishing gas after pressure regulation to the arc extinguishing switch device.
[0006] As an improvement of the above-mentioned scheme, the pressure regulating device includes a pressure reducing valve and a pressure controller, and the two ends of the pressure reducing valve are respectively connected to the gas storage device and the pressure controller, and are used to reduce the pressure of the arc extinguishing gas output by the gas storage device and output the reduced-pressure arc extinguishing gas to the pressure controller; the pressure controller is connected to the arc extinguishing switch device, and is used to output arc extinguishing gas with stable pressure to the arc extinguishing switch device.
[0007] As an improvement of the above solution, the arc extinguishing switch device is a high-frequency solenoid valve.
[0008] As an improvement of the above solution, the signal acquisition device includes a current acquisition sensor and / or a voltage acquisition sensor.
[0009] As an improvement of the above solution, the main control device includes an MCU module.
[0010] As an improvement of the above solution, the gas storage device is a high-pressure gas cylinder.
[0011] Correspondingly, the present invention also provides a circuit breaker gas blowout arc extinguishing method, which is applied to the above-mentioned circuit breaker gas blowout arc extinguishing system, including: real-time acquisition of the voltage signal and / or current signal of the circuit breaker; performing signal initialization processing on the acquired voltage signal and / or current signal to obtain the initialized voltage signal and / or current signal; using a zero-crossing detection algorithm to perform zero-crossing detection on the initialized voltage signal and / or current signal to obtain a zero-crossing detection result; and controlling the arc-extinguishing switch state of the arc-extinguishing switch device according to the zero-crossing detection result. .
[0012] As an improvement of the above scheme, before the step of real-time acquisition of the voltage and current values of the circuit breaker, the step also includes: initializing the pressure regulating gas supply device to obtain arc extinguishing gas of the required pressure and delivering it to the arc extinguishing switch device.
[0013] As an improvement of the above-mentioned scheme, the pressure-regulating gas supply device includes a gas storage device, a pressure reducing valve and a pressure controller connected in sequence, and the pressure controller is connected to the arc extinguishing switch device. The step of initializing the pressure-regulating gas supply device includes: setting the pressure of the gas storage device to a first specified air pressure value, and outputting arc extinguishing gas of the first specified air pressure to the pressure reducing valve; reducing the pressure of the arc extinguishing gas of the first specified air pressure value to a second specified air pressure value through the pressure reducing valve and outputting it to the pressure control valve; stabilizing the arc extinguishing gas of the second specified air pressure value to a required air pressure value through the pressure controller and outputting it to the arc extinguishing switch device.
[0014] The implementation of the present invention has the following beneficial effects:
[0015] The present invention can collect circuit signals of the circuit breaker in real time, and can control the switching state of the arc extinguishing switch device at the optimal time point according to the circuit zero-crossing point detection result, and can timely spray arc extinguishing gas to the active area between the moving and static contacts of the circuit breaker, and close the arc extinguishing switch device after the arc is extinguished, so as to realize high-precision arc extinguishing work, effectively improve the arc extinguishing efficiency, reduce contact wear and electromagnetic interference, and thus improve the reliability and safety of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 The structure of the gas blow-out arc extinguishing system of the circuit breaker of the present invention is shown in FIG. Figure 1 ;
[0017] Figure 2 The structure of the gas blow-out arc extinguishing system of the circuit breaker of the present invention is shown in FIG. Figure 2 ;
[0018] Figure 3 The present invention is a flow chart of the circuit breaker gas blowing arc extinguishing method. DETAILED DESCRIPTION
[0019] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that the directional terms such as up, down, left, right, front, back, inside, outside, etc. that appear or will appear in the text of the present invention are only based on the accompanying drawings of the present invention, and are not specific limitations of the present invention.
[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0022] like Figure 1 As shown, the present invention provides a gas-blowing arc-extinguishing system for a circuit breaker, comprising a pressure-regulating gas supply device 1, an arc-extinguishing switch device 2, a signal acquisition device 3 and a main control device 4; the pressure-regulating gas supply device 1 is connected to the air inlet end of the arc-extinguishing switch device 2 through a pipeline, and is used to output arc-extinguishing gas to the arc-extinguishing switch device 2; the air outlet end of the arc-extinguishing switch device 2 corresponds to the active area 6 between the moving and static contacts 5 of the circuit breaker, and is used to spray the arc-extinguishing gas to the active area 6; the signal acquisition device 3 is connected to the power supply line of the moving and static contacts 5, and is used to collect the voltage signal or current signal of the circuit breaker; the main control device 4 is respectively connected to the signal acquisition device 3 and the arc-extinguishing switch device 2, and is used to control the switching state of the arc-extinguishing switch device 2 according to the voltage signal or current signal sent by the voltage power supply detection device.
[0023] The main control device 4 of the present invention can perform signal zero-crossing detection processing according to the collected voltage signal or current signal of the circuit breaker, and can control the switching state of the arc extinguishing switch device 2 at the optimal time point according to the circuit zero-crossing detection result, and timely issue an arc extinguishing control instruction to the arc extinguishing switch device 2, thereby controlling the arc extinguishing switch device 2 to open at the optimal time. At this time, the arc extinguishing gas is blown to the active area 6 between the moving and static contacts 5 of the circuit breaker, and the arc that may be generated in the active area 6 is extinguished by gas blowing through the arc extinguishing gas. Moreover, the arc extinguishing switch device is closed after the arc is extinguished, thereby realizing high-precision arc extinguishing work, which can effectively improve the arc extinguishing efficiency, reduce contact wear and electromagnetic interference, and thus improve the reliability and safety of the circuit breaker.
[0024] In other embodiments, voltage and current signals can be collected simultaneously, and the arc extinguishing function can be triggered by multiple detection trigger conditions. For example, when the voltage and current signals pass through zero, the main control device 4 controls the arc extinguishing switch device 2 to perform air blowing arc extinguishing, thereby improving the arc extinguishing control accuracy and efficiency.
[0025] It should be noted that other existing arc detection algorithms may be used to detect arc conditions based on the collected circuit signals, so as to accurately control the arc extinguishing switch device 2 to perform air blowing arc extinguishing work according to the detection results.
[0026] In order to avoid the arc extinguishing gas pressure being too high or too low affecting the normal operation and safety of the circuit breaker. Figure 2 As shown, the pressure regulating gas supply device 1 includes a gas storage device 11 and a pressure regulating device 12, wherein the gas storage device 11 stores arc extinguishing gas of a specified pressure; the two ends of the pressure regulating device 12 are respectively connected to the gas storage device 11 and the arc extinguishing switch device 2 through pipelines, and are used to adjust the pressure of the arc extinguishing gas and output the arc extinguishing gas after pressure regulation to the arc extinguishing switch device 2, so as to ensure that the pressure of the arc extinguishing gas in the circuit breaker is not too high or too low, and ensure the normal operation and safety of the circuit breaker. If the pressure of the arc extinguishing gas is too high, it may cause excessive pressure inside the circuit breaker, increasing the risk of mechanical wear and electrical breakdown; if the pressure of the arc extinguishing gas is too low, it may affect its arc extinguishing performance, and even the arc extinguishing function of the circuit breaker may fail.
[0027] Among them, the pressure regulating device 12 includes a pressure reducing valve 121 and a pressure controller 122. The two ends of the pressure reducing valve 121 are respectively connected to the gas storage device 11 and the pressure controller 122 through pipelines. The pressure reducing valve 121 is used to reduce the pressure of the arc extinguishing gas output by the gas storage device 11, and output the reduced-pressure arc extinguishing gas to the pressure controller 122; the pressure controller 122 is connected to the arc extinguishing switch device 2, and is used to output arc extinguishing gas with stable pressure to the arc extinguishing switch device 2. The arc extinguishing work can be better achieved through the arc extinguishing gas with stable pressure.
[0028] In this embodiment, the gas storage pressure of the gas storage device 11 is set to 6MPa, the pressure reducing valve 121 is used to reduce the pressure of the arc extinguishing gas of 6MPa to 1.5MPa, and the pressure controller 122 is used to stably adjust the pressure of the arc extinguishing gas of 1.5MPa to 0.5MPa; when the arc extinguishing switch device 2 is turned on, due to the pressure difference, the arc extinguishing gas will blow to the active area 6 between the moving and static contacts 5 to extinguish the arc that may be generated in the active area 6. It should be noted that the above-mentioned pressure values are not limited to this, and can be adjusted according to the actual design environment of the circuit breaker to ensure the normal operation and safety of the circuit breaker.
[0029] Preferably, the arc extinguishing switch device 2 is a high frequency electromagnetic valve to reduce the switch response time, thereby improving the arc extinguishing efficiency. In this embodiment, the response time of the high frequency electromagnetic valve used is less than 3ms, but not limited thereto.
[0030] Preferably, the signal acquisition device 3 includes a current acquisition sensor 31 and / or a voltage acquisition sensor 32 .
[0031] Preferably, the main control device 4 includes an MCU module, and a memory is provided in the MCU module to store and process the collected circuit signals.
[0032] Preferably, the gas storage device 11 is a high-pressure gas cylinder, but not limited thereto.
[0033] like Figure 3 As shown, the present invention also provides a circuit breaker gas blowout arc extinguishing method, which is applied to the above-mentioned circuit breaker gas blowout arc extinguishing system, comprising:
[0034] S101, collecting voltage signals and / or current signals of the circuit breaker in real time;
[0035] Specifically, the voltage signal and / or current signal of the circuit breaker can be accurately collected by the signal collection device, so as to facilitate subsequent processing of the circuit signal with high precision to obtain accurate processing results.
[0036] S102, performing signal initialization processing on the collected voltage signal and / or the current signal to obtain the initialized voltage signal and / or the current signal;
[0037] It should be noted that the steps of signal initialization processing include:
[0038] Step 1: performing a discrete Fourier transform on the collected voltage signal and / or the current signal to obtain a corresponding circuit frequency domain signal (i.e., a voltage frequency domain signal and / or the current frequency domain signal);
[0039] Step 2: filtering the signals outside the preset frequency range in the circuit frequency domain signal through a filter to obtain the circuit frequency domain signal within the preset frequency range;
[0040] Step 3: Perform an inverse discrete Fourier transform on the circuit frequency domain signal to obtain an initialized circuit signal.
[0041] The above steps can filter out the clutter and interference signals in the original circuit signal to obtain a circuit signal with higher accuracy, ensuring that there is at most one zero-crossing point in the half cycle of the circuit signal after filtering, thereby improving the accuracy of zero-crossing point detection processing.
[0042] S103, performing zero-crossing detection on the initialized voltage signal and / or the current signal using a zero-crossing detection algorithm to obtain a zero-crossing detection result;
[0043] S104. Control the arc extinguishing switch state of the arc extinguishing switch device according to the zero-crossing point detection result.
[0044] The present invention can perform signal zero-crossing detection processing according to the collected voltage signal or current signal of the circuit breaker. The adopted zero-crossing detection algorithm is the existing technology, and its working principle will not be described in detail here. The main control device can control the switching state of the arc extinguishing switch device at the optimal time point according to the circuit zero-crossing detection result, and timely issue an arc extinguishing control instruction to the arc extinguishing switch device, so as to control the arc extinguishing switch device 2 to open at the optimal time. At this time, the arc extinguishing gas is blown to the active area between the moving and static contacts of the circuit breaker. The arc that may be generated in the active area is extinguished by the arc extinguishing gas, and the arc extinguishing switch device is closed after the arc is extinguished, so as to achieve high-precision arc extinguishing work, which can effectively improve the arc extinguishing efficiency, reduce contact wear and electromagnetic interference, and thus improve the reliability and safety of the circuit breaker.
[0045] In other embodiments, voltage and current signals can be collected simultaneously, and the arc extinguishing function can be triggered by multiple detection trigger conditions. For example, when the voltage and current signals pass through zero, the main control device controls the arc extinguishing switch device to perform air blowing arc extinguishing, thereby improving the arc extinguishing control accuracy and efficiency.
[0046] Preferably, before the step of real-time acquisition of the voltage and current values of the circuit breaker, the step also includes: initializing the pressure regulating gas supply device to obtain arc extinguishing gas of the required pressure and delivering it to the arc extinguishing switch device.
[0047] It should be noted that in order to avoid the normal operation and safety of the circuit breaker being affected by the arc extinguishing gas pressure being too high or too low, if the arc extinguishing gas pressure is too high, it may cause excessive pressure inside the circuit breaker, increasing the risk of mechanical wear and electrical breakdown; if the arc extinguishing gas pressure is too low, it may affect its arc extinguishing performance, and even the arc extinguishing function of the circuit breaker may fail. In this regard, when the circuit breaker is used at the factory, the arc extinguishing gas of the corresponding pressure will be pre-set to ensure that there is enough pressure to achieve the air blowing arc extinguishing work, to avoid the arc extinguishing gas pressure being too low to affect its arc extinguishing performance, and even the arc extinguishing function of the circuit breaker may fail, so as to improve the stability of arc extinguishing work.
[0048] Furthermore, the pressure regulating gas supply device comprises a gas storage device, a pressure reducing valve and a pressure controller connected in sequence, the pressure controller is connected to the arc extinguishing switch device, and the step of initializing the pressure regulating gas supply device comprises:
[0049] Step 1, setting the pressure of the gas storage device to a first specified pressure value, and outputting arc-extinguishing gas of the first specified pressure to the pressure reducing valve;
[0050] It should be noted that the gas storage device stores arc-extinguishing gas at a first specified gas pressure value, and the first specified gas pressure value is 6 MPa, but is not limited thereto.
[0051] Step 2, reducing the arc extinguishing gas of the first specified pressure value to a second specified pressure value through the pressure reducing valve and outputting the pressure to the pressure control valve;
[0052] It should be noted that the pressure reducing valve is used to reduce the pressure of arc extinguishing gas at 6 MPa to arc extinguishing gas at a second specified pressure value, and the second specified pressure value is 1.5 MPa, but is not limited thereto.
[0053] Step 3: Stabilize the arc-extinguishing gas of the second specified pressure value to the required pressure value through a pressure controller and output it to the arc-extinguishing switch device.
[0054] It should be noted that the pressure controller is used to stably adjust the arc extinguishing gas pressure of 1.5MPa to 0.5MPa. When the arc extinguishing switch device is turned on, due to the pressure difference, the arc extinguishing gas will blow to the active area between the moving and static contacts to extinguish the arc that may be generated in the active area. Among them, the pressure values set above are not limited to this, and can be adjusted according to the actual design environment of the circuit breaker to ensure the normal operation and safety of the circuit breaker.
[0055] To sum up, the present invention can collect the circuit signal of the circuit breaker in real time, and can control the switching state of the arc extinguishing switch device at the optimal time point according to the circuit zero-crossing detection result, and can timely spray arc extinguishing gas to the active area between the moving and static contacts of the circuit breaker, and close the arc extinguishing switch device after the arc is extinguished, so as to realize high-precision arc extinguishing operation, effectively improve the arc extinguishing efficiency, reduce contact wear and electromagnetic interference, and thus improve the reliability and safety of the circuit breaker.
[0056] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-mentioned embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.
Claims
1. A circuit breaker gas blowout arc extinguishing system, characterized in that: It includes a pressure regulating gas supply device, an arc extinguishing switch device, a signal acquisition device and a main control device; The pressure regulating gas supply device is connected to the gas inlet end of the arc extinguishing switch device, and is used to output arc extinguishing gas to the arc extinguishing switch device; The gas outlet end of the arc extinguishing switch device corresponds to the active area between the moving and static contacts of the circuit breaker, and is used to spray the arc extinguishing gas to the active area; The signal acquisition device is connected to the power supply circuit of the moving and static contacts and is used to acquire the voltage signal and / or current signal of the circuit breaker; The main control device is connected to the signal acquisition device and the arc extinguishing switch device respectively, and is used to control the switching state of the arc extinguishing switch device according to the voltage signal and / or current signal sent by the voltage power supply detection device.
2. The circuit breaker gas blowout arc extinguishing system according to claim 1, characterized in that: The pressure regulating gas supply device comprises a gas storage device and a pressure regulating device, wherein the gas storage device stores arc extinguishing gas; The two ends of the pressure regulating device are respectively connected to the gas storage device and the arc extinguishing switch device, and are used to adjust the pressure of the arc extinguishing gas and output the arc extinguishing gas after pressure regulation to the arc extinguishing switch device.
3. The circuit breaker gas blowout arc extinguishing system according to claim 1, characterized in that: The pressure regulating device comprises a pressure reducing valve and a pressure controller, and the two ends of the pressure reducing valve are respectively connected to the gas storage device and the pressure controller, and are used to reduce the pressure of the arc extinguishing gas output by the gas storage device and output the reduced-pressure arc extinguishing gas to the pressure controller; The pressure controller is connected to the arc extinguishing switch device and is used to output arc extinguishing gas with stable pressure to the arc extinguishing switch device.
4. The circuit breaker gas blowout arc extinguishing system according to any one of claims 1 to 3, characterized in that: The arc extinguishing switch device is a high-frequency solenoid valve.
5. The circuit breaker gas blowout arc extinguishing system according to any one of claims 1 to 3, characterized in that: The signal acquisition device includes a current acquisition sensor and / or a voltage acquisition sensor.
6. The circuit breaker gas blowout arc extinguishing system according to any one of claims 1 to 3, characterized in that: The main control device includes an MCU module.
7. The circuit breaker gas blowout arc extinguishing system according to any one of claims 2 to 3, characterized in that: The gas storage device is a high-pressure gas cylinder.
8. A method for extinguishing arc by gas blowing of a circuit breaker, characterized in that: The circuit breaker gas blowout arc extinguishing system applied to claims 1 to 7 comprises: Collect voltage signals and / or current signals of circuit breakers in real time; Performing signal initialization processing on the collected voltage signal and / or the current signal to obtain the initialized voltage signal and / or the current signal; Performing zero-crossing detection on the initialized voltage signal and / or the current signal using a zero-crossing detection algorithm to obtain a zero-crossing detection result; The arc extinguishing switch state of the arc extinguishing switch device is controlled according to the zero-crossing point detection result.
9. The circuit breaker gas blowout arc extinguishing method according to claim 8, characterized in that: Before the step of real-time acquisition of the voltage value and current value of the circuit breaker, the following steps are also included: The pressure regulating gas supply device is initialized to obtain arc extinguishing gas of required pressure and deliver the arc extinguishing gas to the arc extinguishing switch device.
10. The circuit breaker gas blowout arc extinguishing method according to claim 8, characterized in that: The pressure regulating gas supply device comprises a gas storage device, a pressure reducing valve and a pressure controller connected in sequence, the pressure controller is connected to the arc extinguishing switch device, and the step of initializing the pressure regulating gas supply device comprises: Setting the pressure of the gas storage device to a first specified pressure value, and outputting arc-extinguishing gas of the first specified pressure to the pressure reducing valve; The arc extinguishing gas having a first specified pressure value is decompressed to a second specified pressure value through the pressure reducing valve and outputted to the pressure control valve; The arc-extinguishing gas of the second specified pressure value is stabilized to a required pressure value through a pressure controller and output to the arc-extinguishing switch device.