Arc fault detection method and device and computer equipment

Abstract

The invention relates to the technical field of reliability of electrical equipment, and discloses an arc fault detection method and device and computer equipment, the method is applied to an arc fault circuit breaker, and the method comprises the following steps: according to a preset load type accessed by the arc fault circuit breaker and a preset standard power consumption scene, determining an arc fault according to the preset load type and the preset standard power consumption scene; setting different gears and arc fault detection sensitivities corresponding to the different gears for the arc fault circuit breaker; when a load is connected to the arc fault circuit breaker and the arc fault circuit breaker works at an initial gear, judging whether the arc fault circuit breaker malfunctions or not when it is confirmed that the arc fault does not occur; and when the arc fault circuit breaker malfunctions, selecting a corresponding gear different from the initial gear according to the type of the load connected to the arc fault circuit breaker to adjust the arc fault detection sensitivity of the arc fault circuit breaker, and detecting the arc fault based on the adjusted arc fault detection sensitivity. According to the method, the operation reliability of the arc fault circuit breaker is improved, and the purpose that the AFDD standard is matched with the actual working condition is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of the reliability of electrical equipment, and particularly to an arc fault detection method, device, and computer equipment. Background Art

[0002] In the current rapidly developing field of power and automation technologies, the reliability and safety of electrical equipment have become important indicators for measuring system performance. Among them, AFDD (Arc Fault Detection Device, hereinafter referred to as AFDD, arc fault circuit breaker), also known as an arc fault detection device, is a new type of protective electrical appliance. The AFDD arc fault circuit breaker can detect arc faults in electrical circuits and cut off the circuit before an electrical fire is caused, effectively preventing electrical fires caused by arc faults, and is widely used in residential, commercial buildings, and industrial facilities to effectively prevent electrical fires and electric shock accidents and ensure the safe and stable power supply.

[0003] However, with the increasing complexity and diversification of power systems, especially in new environments such as the access of new energy sources, the popularization of smart homes, and the wide application of high-power electronic devices, the limitations of traditional AFDD standards have gradually emerged. Specifically, when the existing AFDD standards were formulated, the special requirements of emerging load characteristics and new power network environments (such as distributed generation systems, smart grids) were not fully considered, resulting in frequent misoperations of AFDD devices in actual applications. These misoperations not only affect the normal power consumption experience of users but also may cause unnecessary power outages, bringing many inconveniences to daily life and industrial production, and even causing economic losses. With the improvement of users' safety awareness and the enhancement of their rights protection awareness, the misoperation problem of AFDD will become one of the hotspots of consumer complaints.

[0004] Therefore, there is an urgent need for an effective detection method to prevent the misoperation of AFDD. Summary of the Invention

[0005] In view of this, the present invention provides an arc fault detection method, device, and computer equipment to solve the problem that the current AFDD standards cannot match the actual working conditions.

[0006] In a first aspect, the present invention provides an arc fault detection method applied to an arc fault circuit breaker, and the method includes:

[0007] According to the preset load type and the preset standard power consumption scenario accessed by the arc fault circuit breaker, different gears and the corresponding arc fault detection sensitivities for different gears are set for the arc fault circuit breaker;

[0008] When a load is connected to the arc fault circuit breaker and it is operating in the initial gear, it is determined whether the arc fault circuit breaker malfunctions when it is confirmed that no arc fault has occurred.

[0009] When the arc fault circuit breaker malfunctions, select a corresponding gear different from the initial gear according to the type of load connected to the arc fault circuit breaker to adjust the arc fault detection sensitivity of the arc fault circuit breaker, and detect the arc fault based on the adjusted arc fault detection sensitivity.

[0010] An arc fault detection method provided by the present invention sets different gears and the corresponding arc fault detection sensitivities for different gears. When the arc fault circuit breaker malfunctions, select a corresponding gear different from the initial gear according to the type of load connected to the arc fault circuit breaker to adjust the arc fault detection sensitivity of the arc fault circuit breaker, and detect the arc fault based on the adjusted arc fault detection sensitivity. It gives the user the freedom to set the action sensitivity of the arc fault circuit breaker, can enhance the adaptability of the arc fault circuit breaker to different working scenarios, improve the reliability of the operation of the arc fault circuit breaker, achieve the purpose of matching the AFDD standard with the actual working conditions, enhance the environmental adaptability of the arc fault circuit breaker, reduce the occurrence of malfunctions, and thus provide more safe and reliable power protection for users, solving the problem that the current AFDD standard cannot match the actual working conditions.

[0011] In an optional embodiment, the preset load types include known loads and unknown loads;

[0012] When the preset load type connected is a known load and it meets the preset standard for the power usage scenario, set the working gear of the arc fault circuit breaker to the standard gear, set the arc fault detection sensitivity corresponding to the standard gear to the sensitivity for the preset standard power usage scenario, and at the same time set the standard gear as the initial gear of the arc fault circuit breaker;

[0013] When the preset load type connected is a known load and it does not meet the preset standard for the power usage scenario, set the working gear of the arc fault circuit breaker to the AUTO gear, and set the arc fault detection sensitivity of the arc fault circuit breaker in the AUTO gear according to the known load;

[0014] When the preset load type connected is an unknown load, set the working gear of the arc fault circuit breaker to the learning gear, and set the arc fault detection sensitivity of the arc fault circuit breaker in the learning gear according to the unknown load and the learning result;

[0015] When the preset load type connected is a known load, and the working gear for setting the arc fault detection sensitivity based on the preset standard of the power usage scenario and user requirements is set to the first protection gear and the second protection gear of the arc fault circuit breaker, where the arc fault detection sensitivity of the first protection gear is less than that of the standard gear, and the arc fault detection sensitivity of the second protection gear is less than that of the second protection gear.

[0016] An arc fault detection method provided by the present invention sets the standard gear, AUTO gear, learning gear, first protection gear, and second protection gear of the arc fault circuit breaker through the preset load type and the preset standard of the power usage scenario, enabling the arc fault circuit breaker to detect and learn arc faults using different standards, providing conditions for subsequent judgment of misoperation of the arc fault circuit breaker and adjustment of the arc fault detection sensitivity under different working conditions.

[0017] In an alternative embodiment, when a load is connected to the arc fault circuit breaker and it is operating in the initial gear, determining whether the arc fault circuit breaker misoperates when it is confirmed that no arc fault has occurred includes:

[0018] When a load is connected to the arc fault circuit breaker and it is operating in the standard gear, arc fault detection is performed on the actual working condition of the arc fault circuit breaker according to the preset standard of the power usage scenario and the arc fault detection sensitivity corresponding to the standard gear;

[0019] When no arc fault has occurred, determining whether the arc fault circuit breaker misoperates.

[0020] An arc fault detection method provided by the present invention, when a load is connected to the arc fault circuit breaker and it is operating in the initial gear, determines whether the arc fault circuit breaker misoperates when it is confirmed that no arc fault has occurred, performs arc fault detection according to the standard gear of the preset standard, can meet the needs of most user power usage scenarios, and lays a foundation for switching to other gears different from the standard gear when the arc fault circuit breaker misoperates when it is confirmed that no arc fault has occurred.

[0021] In an alternative embodiment, when the arc fault circuit breaker misoperates, selecting a corresponding gear different from the initial gear according to the load type connected to the arc fault circuit breaker to adjust the arc fault detection sensitivity of the arc fault circuit breaker, and performing arc fault detection based on the adjusted arc fault detection sensitivity, includes:

[0022] When the arc fault circuit breaker misoperates, if the load type is a known load, then select the AUTO gear to adjust the arc fault detection sensitivity of the arc fault circuit breaker based on the known load, and perform arc fault detection based on the adjusted arc fault detection sensitivity;

[0023] When the arc fault circuit breaker malfunctions, if the load type is an unknown load, select the learning mode to perform self-learning based on the operating conditions of each malfunction, and adjust the arc fault detection sensitivity of the arc fault circuit breaker based on the results of each self-learning and the unknown load. Detect the arc fault based on the adjusted arc fault detection sensitivity.

[0024] An arc fault detection method provided by the present invention selects the AUTO mode and the learning mode respectively to adjust the arc fault detection sensitivity of the arc fault circuit breaker for known loads or unknown loads, can detect and learn arc faults using different load standards, and realizes the automatic adjustment of the arc fault detection sensitivity under different load conditions.

[0025] In an optional embodiment, when the arc fault circuit breaker malfunctions, select a corresponding gear different from the initial gear according to the load type connected to the arc fault circuit breaker to adjust the arc fault detection sensitivity of the arc fault circuit breaker, and detect the arc fault based on the adjusted arc fault detection sensitivity. It also includes:

[0026] When the arc fault circuit breaker malfunctions, if the load type is a known load, select Protection Gear One or Protection Gear Two according to user requirements, and directly detect the arc fault using the set arc fault detection sensitivity of Protection Gear One or Protection Gear Two.

[0027] An arc fault detection method provided by the present invention, when the arc fault circuit breaker malfunctions, if the load type is a known load, select Protection Gear One or Protection Gear Two according to user requirements, and directly detect the arc fault using the set arc fault detection sensitivity of Protection Gear One or Protection Gear Two, enabling the user to select the protection gear by adjusting the sensitivity handle on the arc fault circuit breaker product according to the actual operating conditions, which can reduce the malfunction of the arc fault circuit breaker.

[0028] In an optional embodiment, before selecting the AUTO mode to adjust the arc fault detection sensitivity of the arc fault circuit breaker based on a known load, the arc detection method further includes:

[0029] Detect the current signal before the malfunction and the current signal after the malfunction when the known load is connected to the arc fault circuit breaker;

[0030] Determine the current signal characteristic threshold when the known load has an arc fault based on the current signal before the malfunction and the current signal after the malfunction, and save the current signal characteristic threshold when the known load has an arc fault in the preset load library.

[0031] In an alternative embodiment, selecting the AUTO gear to adjust the arc fault detection sensitivity of the arc fault circuit breaker based on a known load includes:

[0032] Using the AUTO gear to identify the known load, and matching the corresponding known load and the current signal characteristic threshold when an arc fault occurs in a preset load library;

[0033] Adjusting the arc fault detection sensitivity of the arc fault circuit breaker in the AUTO gear based on the current signal characteristic threshold when an arc fault occurs in the known load in the preset load library.

[0034] For an arc fault detection method provided by the present invention, the AUTO gear can perform load detection and identification. If the known load contains the arc fault information of the current load in the preset load library, the sensitivity of the arc fault detection algorithm is automatically adjusted according to the currently connected load, realizing the automatic adjustment of the arc fault detection sensitivity under different load conditions, and avoiding frequent false operations caused by sensitive loads.

[0035] In an alternative embodiment, selecting the learning gear to perform self-learning based on the working conditions of each false operation, and adjusting the arc fault detection sensitivity of the arc fault circuit breaker based on the results of each self-learning and the unknown load, includes:

[0036] Collecting the current signal of each false operation when the unknown load is connected to the arc fault circuit breaker, and inputting it into a pre-trained deep learning neural network in the learning gear to identify the load type, converting the unknown load into a known load and storing it in the preset load library;

[0037] Matching the corresponding known load and the current signal characteristic threshold when an arc fault occurs in the preset load library;

[0038] Adjusting the arc fault detection sensitivity of the arc fault circuit breaker in the learning gear based on the current signal characteristic threshold when an arc fault occurs in the known load in the preset load library.

[0039] For an arc fault detection method provided by the present invention, for an unknown load that is relatively sensitive to the arc fault detection algorithm, when the user knows there is no risk, the learning gear is turned on, and the arc fault circuit breaker starts to record the arc current data of the current false operation, and uses a deep learning algorithm to learn this data, realizing the automatic adjustment of the arc fault detection sensitivity under the working conditions of unknown sensitive loads, and avoiding frequent false operations caused by unknown loads.

[0040] In a second aspect, the present invention provides an arc fault detection device, which is applied to an arc fault circuit breaker, and the device includes:

[0041] A gear position and sensitivity setting module is configured to set different gear positions and the corresponding arc fault detection sensitivities for an arc fault circuit breaker according to a preset load type and a preset standard power consumption scenario to which the arc fault circuit breaker is connected;

[0042] A malfunction judgment module is configured to judge whether the arc fault circuit breaker malfunctions when it is confirmed that no arc fault occurs while a load is connected to the arc fault circuit breaker and operates in the initial gear position;

[0043] A sensitivity adjustment and arc fault detection module is configured to, when the arc fault circuit breaker malfunctions, select a corresponding gear position different from the initial gear position according to the load type connected to the arc fault circuit breaker to adjust the arc fault detection sensitivity of the arc fault circuit breaker, and detect the arc fault based on the adjusted arc fault detection sensitivity.

[0044] In a third aspect, the present invention provides a computer device, including: a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to execute the arc fault detection method according to the first aspect or any corresponding embodiment thereof.

[0045] In a fourth aspect, the present invention provides a computer-readable storage medium, on which computer instructions are stored. The computer instructions are used to cause a computer to execute the arc fault detection method according to the first aspect or any corresponding embodiment thereof.

[0046] In a fifth aspect, the present invention provides a computer program product, including computer instructions, which are used to cause a computer to execute the arc fault detection method according to the first aspect or any corresponding embodiment thereof. Description of the Drawings

[0047] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0048] Figure 1 is a schematic flowchart of an arc fault detection method according to an embodiment of the present invention;

[0049] Figure 2 is a schematic flowchart of another arc fault detection method according to an embodiment of the present invention;

[0050] Figure 3 is a schematic flowchart of yet another arc fault detection method according to an embodiment of the present invention;

[0051] Figure 4 is a schematic structural diagram of a multi - gear arc - fault circuit breaker according to an embodiment of the present invention;

[0052] Figure 5 is a block diagram of the structure of an arc - fault detection device according to an embodiment of the present invention;

[0053] Figure 6 is a schematic hardware structure diagram of a computer device according to an embodiment of the present invention. Detailed implementation manners

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

[0055] The design of the AFDD aims to accurately and quickly detect a fault arc and perform a tripping operation. According to the relevant regulations of the national standard GB / T31143, the AFDD has different operation - time requirements under different current levels, different load conditions, and different arc types, that is, when an arc fault occurs in the corresponding working condition, the AFDD needs to complete the operation within the specified time to cut off the line where the detected arc is located in time, avoiding the occurrence of more serious electrical faults or even electrical fires.

[0056] During the research and development and the inspection of the AFDD, due to the arc - detection algorithm in the circuit breaker being too sensitive, the current electrical signal is judged as an arc signal when there is no arc fault, which causes misoperation, and this is not allowed in arc - fault detection. Misoperation will have a great adverse impact on the power - consumption reliability of users. The problem of misoperation of the current AFDD generally exists in various complex - load power - consumption scenarios. For example, the influence of new electrical loads and smart grids often leads to the misoperation of the AFDD. This is because during the production and research and development of the AFDD, tests are carried out according to the existing AFDD - related standards, and the existing AFDD standards lack regulations on the operation time under more load conditions. Especially with the continuous application of new electrical loads, the mismatch between the AFDD standards and the actual arc - occurrence scenarios in production and life has been exacerbated.

[0057] Since the application scenarios of current arc-fault circuit breakers (hereinafter referred to as AFDDs) are extremely complex and often face special requirements of a large number of new power network environments such as distributed generation systems and smart grids, while the existing AFDD standards often neglect these emerging load characteristics during formulation, it is extremely easy for the fault arc circuit breakers designed based on the existing AFDD standards to malfunction when facing the power consumption scenarios of emerging loads, which has an adverse impact on the reliability of power consumption and the safe and stable operation of the power system. Therefore, based on the current situation that the existing AFDD standards cannot match the actual working conditions, the embodiments of the present invention provide an arc-fault detection method, which flexibly adjusts the arc-fault detection sensitivity by setting multiple gears for the AFDD, achieving the effect of matching the existing AFDD standards with the actual working conditions.

[0058] According to an embodiment of the present invention, an embodiment of an arc-fault detection method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0059] In this embodiment, an arc-fault detection method is provided, which can be used for an arc-fault circuit breaker. Figure 1 It is a flowchart of the arc-fault detection method according to an embodiment of the present invention, as Figure 1 shown, and this process includes the following steps:

[0060] Step S101, according to the preset load type and the power consumption scenario of the preset standard accessed by the arc-fault circuit breaker, set different gears and the corresponding arc-fault detection sensitivities for different gears of the arc-fault circuit breaker.

[0061] Specifically, the preset standard in this embodiment refers to the national standard GB / T 31143, that is, the general requirements for arc-fault circuit breakers (AFDDs). The preset load type can be the loads that typically apply the national standard in the family, such as common known load types like vacuum cleaners, switch circuits, air compressors, dimming lights, halogen lights, hand-held power stations, resistive loads, and fluorescent lights. The preset load type can also be other available unknown load types, such as electric welders and electric drills.

[0062] According to the different loads accessed by the arc-fault circuit breaker and the national standard GB / T 31143, the power consumption scenarios that meet the national standard GB / T 31143 are set as the standard gear, and the power consumption scenarios other than the standard gear are set as other different gears, so as to achieve the purpose of flexibly adjusting the arc-fault detection sensitivity.

[0063] Step S102, when a load is connected to the arc fault circuit breaker and it is operating in the initial gear, determine whether the arc fault circuit breaker malfunctions when it is confirmed that no arc fault has occurred.

[0064] Specifically, when a load is connected to the arc fault circuit breaker and the arc fault circuit breaker is operating in the initial gear, for example, using the standard gear as the initial gear, at this time, confirm that no arc fault has occurred in the current power usage scenario. At this time, determine whether the arc fault circuit breaker malfunctions frequently. If it malfunctions frequently, it indicates that the arc fault detection sensitivity at this time does not conform to the actual power usage scenario at this time, and it is necessary to switch to other gears to adjust the arc fault detection sensitivity; if it does not malfunction frequently, it indicates that the arc fault detection sensitivity at this time conforms to the actual power usage scenario at this time, and there is no need to switch to other gears.

[0065] Step S103, when the arc fault circuit breaker malfunctions, select a corresponding gear different from the initial gear according to the type of load connected to the arc fault circuit breaker to adjust the arc fault detection sensitivity of the arc fault circuit breaker, and detect the arc fault based on the adjusted arc fault detection sensitivity.

[0066] Specifically, when the arc fault circuit breaker malfunctions, it indicates that the arc fault detection sensitivity at this time does not conform to the actual power usage scenario at this time. Select a corresponding gear different from the initial gear according to the type of load connected to the arc fault circuit breaker to adjust the arc fault detection sensitivity of the arc fault circuit breaker, so as to realize the adjustment of the arc fault detection sensitivity of the arc fault circuit breaker for known and unknown loads in different power usage scenarios, avoid frequent malfunctions caused by sensitive loads or unknown sensitive loads, and detect the arc fault in the current corresponding power usage scenario based on the adjusted arc fault detection sensitivity.

[0067] The arc fault detection method provided in this embodiment sets different gears and the corresponding arc fault detection sensitivities for different gears. When the arc fault circuit breaker malfunctions, select a corresponding gear different from the initial gear according to the type of load connected to the arc fault circuit breaker to adjust the arc fault detection sensitivity of the arc fault circuit breaker, and detect the arc fault based on the adjusted arc fault detection sensitivity. It gives the user the freedom to set the action sensitivity of the arc fault circuit breaker, can enhance the adaptability of the arc fault circuit breaker to different working scenarios, improve the reliability of the operation of the arc fault circuit breaker, achieve the purpose of matching the AFDD standard with the actual working conditions, enhance the environmental adaptability of the arc fault circuit breaker, reduce the occurrence of malfunctions, and thus provide more safe and reliable power protection for users, solving the problem that the current AFDD standard cannot match the actual working conditions.

[0068] In this embodiment, an arc fault detection method is provided, which can be used for an arc fault circuit breaker.Figure 2 is a flowchart of an arc fault detection method according to an embodiment of the present invention. As Figure 2 shown, the process includes the following steps:

[0069] Step S201: Set different gears and the corresponding arc fault detection sensitivities for the arc fault circuit breaker according to the preset load type and the preset standard power consumption scenario accessed by the arc fault circuit breaker.

[0070] Specifically, the preset load types include known loads and unknown loads; the above step S201 includes:

[0071] Step S2011: When the preset load type accessed is a known load and meets the preset standard power consumption scenario, set the working gear of the arc fault circuit breaker to the standard gear, set the arc fault detection sensitivity corresponding to the standard gear to the sensitivity of the preset standard power consumption scenario, and at the same time set the standard gear as the initial gear of the arc fault circuit breaker.

[0072] Specifically, as Figure 4 shown, when the accessed load is a known load such as a vacuum cleaner, a switching circuit, an air compressor, a dimmable lamp, a halogen lamp, a portable power station, a resistive load, and a fluorescent lamp, and meets the power consumption scenario of the national standard GB / T31143, set the working gear of the arc fault circuit breaker to the standard gear, set the arc fault detection sensitivity corresponding to the standard gear to the sensitivity of the preset standard power consumption scenario, and set the standard gear as the initial gear for the operation of the arc fault circuit breaker.

[0073] Step S2012: When the preset load type accessed is a known load and does not meet the preset standard power consumption scenario, set the working gear of the arc fault circuit breaker to the AUTO gear, and set the arc fault detection sensitivity of the arc fault circuit breaker in the AUTO gear according to the known load.

[0074] Specifically, as Figure 4 shown, when the accessed load is a known load such as a vacuum cleaner, a switching circuit, an air compressor, a dimmable lamp, a halogen lamp, a portable power station, a resistive load, and a fluorescent lamp, but does not meet the power consumption scenario of the national standard GB / T 31143, set the working gear of the arc fault circuit breaker to the AUTO gear (also called the automatic gear). The AUTO gear can perform load detection and identification of the accessed load and automatically adjust the arc fault detection sensitivity according to the currently accessed load.

[0075] Step S2013: When the preset load type accessed is an unknown load, set the working gear of the arc fault circuit breaker to the learning gear, and set the arc fault detection sensitivity of the arc fault circuit breaker in the learning gear according to the unknown load and the learning result.

[0076] Specifically, asFigure 4 As shown, when the preset load types connected are unknown loads such as electric welders and electric drills, set the operating gear of the arc fault circuit breaker to the learning gear. The learning gear can define the unknown load as a known load through deep learning, and set the arc fault detection sensitivity of the arc fault circuit breaker in the learning gear based on the unknown load and the learning result, so as to adapt to new loads and reduce frequent false operations.

[0077] Step S2014, when the preset load type connected is a known load, and the operating gears for setting the arc fault detection sensitivity based on the preset standard's power usage scenarios and user requirements are set to the first protection gear and the second protection gear of the arc fault circuit breaker. Among them, the arc fault detection sensitivity of the first protection gear is less than that of the standard gear, and the arc fault detection sensitivity of the second protection gear is less than that of the second protection gear.

[0078] Specifically, as Figure 4 shown, when the preset load types connected are known loads such as vacuum cleaners, switch circuits, air compressors, dimmable lights, halogen lights, portable power stations, resistive loads, and fluorescent lights, and the operating gears for setting the arc fault detection sensitivity based on the power usage scenarios and user requirements of the national standard GB / T 31143 are set to the first protection gear and the second protection gear of the arc fault circuit breaker, which is applicable to estimating the arc fault detection sensitivity in household electrical circuits or directly applying to household electrical circuits. Among them, the arc fault detection sensitivity of the first protection gear is less than that of the standard gear, and the arc fault detection sensitivity of the second protection gear is less than that of the second protection gear. Therefore, when the standard gear has frequent false operations, the first protection gear or the second protection gear can also be directly used to quickly adapt to the current power usage scenario.

[0079] Step S202, when a load is connected to the arc fault circuit breaker and it is operating in the initial gear, determine whether the arc fault circuit breaker has a false operation when it is confirmed that no arc fault has occurred.

[0080] Specifically, the above step S202 includes:

[0081] Step S2021, when a load is connected to the arc fault circuit breaker and it is operating in the standard gear, perform arc fault detection on the actual working conditions of the arc fault circuit breaker according to the power usage scenarios of the preset standard and the arc fault detection sensitivity corresponding to the standard gear.

[0082] Specifically, when a load is connected to the arc fault circuit breaker and it is operating in the standard gear, perform arc fault detection on the actual working conditions of the arc fault circuit breaker according to the power usage scenarios of the national standard GB / T31143 and the arc fault detection sensitivity corresponding to the standard gear.

[0083] Step S2022: When no arc fault occurs, determine whether the arc fault circuit breaker malfunctions

[0084] Step S203: When the arc fault circuit breaker malfunctions, select a corresponding gear different from the initial gear according to the load type connected to the arc fault circuit breaker to adjust the arc fault detection sensitivity of the arc fault circuit breaker, and detect the arc fault based on the adjusted arc fault detection sensitivity. For details, please refer to Figure 1 Step S103 of the embodiment shown, which will not be elaborated here

[0085] The arc fault detection method provided in this embodiment, through preset load types and preset standard power usage scenarios, sets the standard gear, AUTO gear, learning gear, protection gear one, and protection gear two of the arc fault circuit breaker, enabling the arc fault circuit breaker to detect and learn arc faults using different standards. When a load is connected to the arc fault circuit breaker and operates in the initial gear, it is determined whether the arc fault circuit breaker malfunctions when it is confirmed that no arc fault occurs, and arc fault detection is performed according to the standard gear of the preset standard, which can meet the needs of most user power usage scenarios. When the arc fault circuit breaker malfunctions when it is confirmed that no arc fault occurs, it lays the foundation for switching to other gears different from the standard gear

[0086] In this embodiment, an arc fault detection method is provided, which can be used for an arc fault circuit breaker Figure 3 It is a flowchart of the arc fault detection method according to an embodiment of the present invention. As Figure 3 shown, the process includes the following steps:

[0087] Step S301: According to the preset load type connected to the arc fault circuit breaker and the preset standard power usage scenario, set different gears and the corresponding arc fault detection sensitivities for different gears of the arc fault circuit breaker. For details, please refer to Figure 2 Step S201 of the embodiment shown, which will not be elaborated here

[0088] Step S302: When a load is connected to the arc fault circuit breaker and operates in the initial gear, determine whether the arc fault circuit breaker malfunctions when it is confirmed that no arc fault occurs. For details, please refer to Figure 2 Step S202 of the embodiment shown, which will not be elaborated here

[0089] Step S303: When the arc fault circuit breaker malfunctions, select a corresponding gear different from the initial gear according to the load type connected to the arc fault circuit breaker to adjust the arc fault detection sensitivity of the arc fault circuit breaker, and detect the arc fault based on the adjusted arc fault detection sensitivity

[0090] Specifically, the above step S303 includes:

[0091] Step S3031, when the arc fault circuit breaker malfunctions, if the load type is a known load, select the AUTO gear to adjust the arc fault detection sensitivity of the arc fault circuit breaker based on the known load, and detect the arc fault based on the adjusted arc fault detection sensitivity.

[0092] In some optional embodiments, the above step S3031 includes:

[0093] Step a1, detect the current signal before the malfunction of the known load connected to the arc fault circuit breaker and the current signal after the malfunction; determine the current signal characteristic threshold when the known load has an arc fault based on the current signal before the malfunction and the current signal after the malfunction, and save the current signal characteristic threshold when the known load has an arc fault in the preset load library.

[0094] Specifically, the preset load library is a database set on the arc fault circuit breaker for storing information of each load, such as information of known loads like vacuum cleaners, switch circuits, air compressors, dimmable lights, halogen lights, portable power stations, resistive loads, and fluorescent lights.

[0095] Step a2, use the AUTO gear to identify the known load, and match the corresponding known load and the corresponding current signal characteristic threshold when an arc fault occurs in the preset load library.

[0096] Specifically, the current signal characteristic threshold is the arc fault detection sensitivity corresponding to the load when an arc fault occurs. Use the AUTO gear to identify the specific type of the known load, such as specifically a vacuum cleaner, a switch circuit, an air compressor, a dimmable light, a halogen light, a portable power station, a resistive load, or a fluorescent light, and find the corresponding load that matches it in the preset load library, as well as the current signal characteristic threshold corresponding to the corresponding load, that is, the arc fault detection sensitivity.

[0097] Exemplarily, as Figure 4 shown, after starting the AUTO gear, the AFDD collects the current signal of the current circuit and inputs it into a pre-trained CNN-LSTM-Attention (Convolutional Neural Networks-Long Short-Term Memory-Attention) model. Through the load recognition algorithm, the purpose of separating and recognizing the load current is achieved, and the unknown load is recognized. If the preset load library of the AFDD contains information of the newly connected load (i.e., the recognized unknown load), the arc fault detection sensitivity is automatically adjusted according to the currently connected load.

[0098] Step a3, adjust the arc fault detection sensitivity of the arc fault circuit breaker in AUTO gear based on the current signal characteristic threshold when an arc fault occurs for the known loads in the preset load library.

[0099] Specifically, the current signal is processed in AUTO gear, and the change in the current signal characteristic value before and after the occurrence of the arc is compared to determine the current signal characteristic threshold when an arc fault occurs. When an arc occurs for different loads, their current signal characteristic thresholds are also different. The AUTO gear automatically adjusts the determined current signal characteristic threshold by identifying the specific type of the load and referring to the information of the corresponding load in the preset load library, so as to change the arc fault detection sensitivity of the AFDD.

[0100] For the arc fault detection method provided by the present invention, the AUTO gear can perform load detection and identification. If the known load contains the arc fault information of the current load in the preset load library, the sensitivity of the arc fault detection algorithm is automatically adjusted according to the currently connected load, so as to realize the automatic adjustment of the arc fault detection sensitivity under different load conditions, and avoid frequent misoperations caused by sensitive loads.

[0101] Step S3032, when the arc fault circuit breaker malfunctions, if the load type is an unknown load, select the learning gear to perform self-learning based on the working conditions of each malfunction, and adjust the arc fault detection sensitivity of the arc fault circuit breaker based on the results of each self-learning and the unknown load, and detect the arc fault based on the adjusted arc fault detection sensitivity.

[0102] Specifically, when an unknown load is connected to the arc fault circuit breaker, if it is a relatively sensitive load, that is, its arc detection sensitivity is in a relatively sensitive data range, which refers to several types of loads that are prone to malfunction based on the AFDD detection standard. Since the time-frequency domain characteristics of the current of an alternating current arc are often similar to those of some loads in the time-frequency domain, it is very easy to judge its normal working state as an arc fault. Such loads are relatively sensitive load types. When the user is using electricity normally, based on their own common sense of safe electricity use, it is judged that the current load is not on fire. After investigation, no arc phenomenon appears, and the load is in a normal working state, which is the risk-free state judged by the user.

[0103] In some optional embodiments, the above step S3032 includes:

[0104] Step b1, collect the current signals of each malfunction when the unknown load is connected to the arc fault circuit breaker, and input them into the pre-trained deep learning neural network in the learning gear to identify the load type, convert the unknown load into a known load, and store it in the preset load library.

[0105] Step b2, match the corresponding known load and the corresponding current signal characteristic threshold when an arc fault occurs in the preset load library.

[0106] Step b3: Adjust the arc fault detection sensitivity of the arc fault circuit breaker in the learning mode based on the current signal feature threshold when an arc fault occurs for the known loads in the preset load library.

[0107] Specifically, after starting the learning mode, the AFDD collects the current signal of the current circuit and inputs it into the pre-trained deep learning neural network model. Through the deep learning algorithm, the load current is separated and identified, and the unknown load is identified. If the information of the newly connected load (i.e., the identified unknown load) is included in the AFDD preset load library, the arc fault detection sensitivity is automatically adjusted according to the currently connected load.

[0108] It should be noted that as Figure 4 shown, when the deep learning algorithm processes the arc current signal, it first preprocesses the current signal, including cleaning, normalization, and feature extraction, to remove noise and extract time-domain, frequency-domain, or time-frequency domain features. Then, according to the data characteristics, a suitable model is selected, and the error is minimized through the loss function. Combining with regularization techniques to prevent overfitting. After training, cross-validation and performance metrics are used to evaluate the model performance, and the effect is further improved through hyperparameter tuning and model integration. Among them, indicators such as accuracy and recall rate reflect the detection ability of the model for arc current. The best threshold is determined by plotting the ROC (Receiver Operating Characteristic Curve) curve, and continuous adjustment is made to achieve a better balance between false alarms and missed alarms. After continuously adjusting the threshold, the model performance is evaluated to ensure that the adjusted threshold can meet the actual application requirements. If the performance is not ideal, the model can be further optimized or the threshold can be readjusted. Through this dynamic adjustment, the arc detection system can achieve the best performance in actual applications. Through the above steps, deep learning can efficiently analyze arc current data and provide reliable fault diagnosis, prediction, and monitoring capabilities for fault arc detection.

[0109] The specific implementation content of step b2 is the same as that of the above step a2, and the specific implementation content of step b3 is the same as that of the above step a3, which will not be elaborated here.

[0110] For the unknown load that is sensitive to the arc fault detection algorithm in the arc fault detection method provided in this embodiment, when the user knows there is no risk, the learning mode is turned on, and the arc fault circuit breaker starts to record the current arc current data of misoperation, and uses the deep learning algorithm to learn this data, so as to realize the automatic adjustment of the arc fault detection sensitivity under the working conditions of unknown sensitive loads, and avoid frequent misoperation caused by unknown loads.

[0111] Step S3033: When the arc fault circuit breaker malfunctions, if the load type is a known load, select Protection Level 1 or Protection Level 2 according to user requirements, and directly use the set arc fault detection sensitivity of Protection Level 1 or the arc fault detection sensitivity of Protection Level 2 to detect arc faults.

[0112] The arc fault detection method provided in this embodiment selects the AUTO gear and the learning gear to adjust the arc fault detection sensitivity of the arc fault circuit breaker for known loads or unknown loads respectively, and can detect and learn arc faults using different load standards, realizing the automatic adjustment of the arc fault detection sensitivity under different load conditions. When the arc fault circuit breaker malfunctions, if the load type is a known load, select Protection Level 1 or Protection Level 2 according to user requirements, and directly use the set arc fault detection sensitivity of Protection Level 1 or the arc fault detection sensitivity of Protection Level 2 to detect arc faults, enabling the user to select the protection level by adjusting the sensitivity handle on the arc fault circuit breaker product according to the actual working conditions, which can reduce the malfunction of the arc fault circuit breaker.

[0113] The arc fault detection method provided in this embodiment mentions 4 different gears, namely the standard gear, the AUTO gear, the learning gear, Protection Level 1 and Protection Level 2. Among them, the standard gear and Protection Levels 1 and 2 are the arc fault detection sensitivities under different power usage scenarios set based on national standard tests. The standard gear is set completely according to the national standard test results, the sensitivity of Protection Level 1 is slightly less than that of the standard gear, and the sensitivity of Protection Level 2 is slightly less than that of Protection Level 1, facilitating free setting by users; when in a specific known load environment and it is difficult to distinguish the current characteristics of the load from the arc characteristics due to its own characteristics, the arc fault circuit breaker is prone to malfunction under the standard gear. At this time, it can be switched to the AUTO gear for load identification, and the arc fault detection sensitivity of the corresponding load set in advance is called according to the load identification result; when there is an unknown load connected to the arc fault circuit breaker, switch the gear to the learning gear, and the current load characteristics can be learned through a deep learning algorithm, and a suitable arc fault detection sensitivity is self-assigned. The above settings of different gears can significantly reduce the malfunction rate of the AFDD and improve the reliability of the AFDD.

[0114] In this embodiment, an arc fault detection device is also provided. This device is used to implement the above embodiments and preferred implementation manners, and those that have been described will not be repeated. As used below, the term "module" can be a combination of software and / or hardware that can achieve a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware is also possible and contemplated.

[0115] This embodiment provides an arc fault detection device, which is applied to an arc fault circuit breaker, asFigure 5 As shown, it includes:

[0116] A gear and sensitivity setting module 501, configured to set different gears and the corresponding arc fault detection sensitivities for different gears of the arc fault circuit breaker according to the preset load type and the preset standard power consumption scenario accessed by the arc fault circuit breaker.

[0117] A misoperation judgment module 502, configured to judge whether the arc fault circuit breaker misoperates when it is confirmed that no arc fault occurs when a load is connected to the arc fault circuit breaker and operates in the initial gear.

[0118] A sensitivity adjustment and arc fault detection module 503, configured to, when the arc fault circuit breaker misoperates, select a corresponding gear different from the initial gear according to the load type connected to the arc fault circuit breaker to adjust the arc fault detection sensitivity of the arc fault circuit breaker, and detect the arc fault based on the adjusted arc fault detection sensitivity.

[0119] In some optional embodiments, the preset load type includes known loads and unknown loads; the gear and sensitivity setting module 501 includes:

[0120] A standard gear setting unit, configured to, when the preset load type connected is a known load and meets the preset standard power consumption scenario, set the operating gear of the arc fault circuit breaker to the standard gear, set the arc fault detection sensitivity corresponding to the standard gear to the sensitivity of the preset standard power consumption scenario, and at the same time set the standard gear as the initial gear of the arc fault circuit breaker.

[0121] An AUTO gear setting unit, configured to, when the preset load type connected is a known load and does not meet the preset standard power consumption scenario, set the operating gear of the arc fault circuit breaker to the AUTO gear, and set the arc fault detection sensitivity of the arc fault circuit breaker in the AUTO gear according to the known load.

[0122] A learning gear setting unit, configured to, when the preset load type connected is an unknown load, set the operating gear of the arc fault circuit breaker to the learning gear, and set the arc fault detection sensitivity of the arc fault circuit breaker in the learning gear according to the unknown load and the learning result.

[0123] A protection first gear and protection second gear setting unit, configured to, when the preset load type connected is a known load and the operating gear for setting the arc fault detection sensitivity based on the preset standard power consumption scenario and user requirements is set to the protection first gear and protection second gear of the arc fault circuit breaker, wherein the arc fault detection sensitivity of the protection first gear is less than the arc fault detection sensitivity of the standard gear, and the arc fault detection sensitivity of the protection second gear is less than the arc fault detection sensitivity of the protection second gear.

[0124] In some alternative embodiments, the malfunction judgment module 502 includes:

[0125] When a load is connected to the arc fault circuit breaker and operates in the standard gear, the actual working condition of the arc fault circuit breaker is detected for arc faults according to the preset standard power consumption scenario and the arc fault detection sensitivity corresponding to the standard gear.

[0126] The malfunction judgment unit is configured to judge whether the arc fault circuit breaker malfunctions when no arc fault occurs.

[0127] In some alternative embodiments, the sensitivity adjustment and arc fault detection module 503 includes:

[0128] The AUTO gear processing unit is configured to, when the arc fault circuit breaker malfunctions, if the load type is a known load, select the AUTO gear to adjust the arc fault detection sensitivity of the arc fault circuit breaker based on the known load, and detect the arc fault based on the adjusted arc fault detection sensitivity.

[0129] The learning gear processing unit is configured to, when the arc fault circuit breaker malfunctions, if the load type is an unknown load, select the learning gear to perform self-learning based on the working condition of each malfunction, and adjust the arc fault detection sensitivity of the arc fault circuit breaker based on the result of each self-learning and the unknown load, and detect the arc fault based on the adjusted arc fault detection sensitivity.

[0130] The protection first gear and protection second gear processing unit is configured to, when the arc fault circuit breaker malfunctions, if the load type is a known load, select the protection first gear or the protection second gear according to the user's requirement, and directly detect the arc fault using the set arc fault detection sensitivity of the protection first gear or the protection second gear.

[0131] In some alternative embodiments, the AUTO gear processing unit includes:

[0132] Detect the current signal before the malfunction of the known load connected to the arc fault circuit breaker and the current signal after the malfunction; determine the current signal characteristic threshold when the known load has an arc fault based on the current signal before the malfunction and the current signal after the malfunction, and store the current signal characteristic threshold when the known load has an arc fault in the preset load library.

[0133] The first matching subunit is configured to identify the known load using the AUTO gear and match the corresponding known load and the corresponding current signal characteristic threshold when an arc fault occurs in the preset load library.

[0134] The AUTO - gear sensitivity adjustment subunit is used to adjust the arc - fault detection sensitivity of the arc - fault circuit breaker in the AUTO - gear based on the current - signal feature threshold when an arc fault occurs in a known load in a preset load library.

[0135] In some alternative embodiments, the learning - gear processing unit includes:

[0136] The load - type identification subunit is used to collect the current signals of each misoperation when an unknown load is connected to the arc - fault circuit breaker, input them into the pre - trained deep - learning neural network in the learning - gear to identify the load type, convert the unknown load into a known load, and store it in the preset load library.

[0137] The second matching subunit is used to match the corresponding known load and the corresponding current - signal feature threshold when an arc fault occurs in the preset load library.

[0138] The learning - gear sensitivity adjustment subunit is used to adjust the arc - fault detection sensitivity of the arc - fault circuit breaker in the learning - gear based on the current - signal feature threshold when an arc fault occurs in a known load in the preset load library.

[0139] The further function descriptions of the above - mentioned various modules and units are the same as those in the corresponding above - mentioned embodiments, and will not be elaborated here.

[0140] The arc - fault detection device in this embodiment is presented in the form of functional units. Here, the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and a memory that execute one or more software or fixed programs, and / or other devices that can provide the above - mentioned functions.

[0141] The embodiment of the present invention also provides a computer device having the above - mentioned Figure 5 shown arc - fault detection device.

[0142] Please refer to Figure 6 , Figure 6 which is a schematic structural diagram of a computer device provided by an alternative embodiment of the present invention. As Figure 6As shown, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Each component communicates with each other using different buses and can be installed on a common motherboard or installed in other ways as needed. The processor can process instructions executed within the computer device, including instructions stored in the memory or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some alternative embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a set of blade servers, or a multi-processor system). Figure 6 In the figure, one processor 10 is taken as an example.

[0143] The processor 10 can be a central processing unit, a network processor, or a combination thereof. Among them, the processor 10 can further include a hardware chip. The above hardware chip can be an application-specific integrated circuit, a programmable logic device, or a combination thereof. The above programmable logic device can be a complex programmable logic device, a field programmable gate array, a generic array logic, or any combination thereof.

[0144] Among them, the memory 20 stores instructions executable by at least one processor 10, so that the at least one processor 10 executes the method shown in the above embodiments.

[0145] The memory 20 can include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the computer device. In addition, the memory 20 can include a high-speed random access memory and can also include a non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some alternative embodiments, the memory 20 can optionally include a memory remotely set relative to the processor 10, and these remote memories can be connected to the computer device through a network. Examples of the above network include but are not limited to the Internet, an enterprise intranet, a local area network, a mobile communication network, and combinations thereof.

[0146] The memory 20 can include a volatile memory, such as a random access memory; the memory can also include a non-volatile memory, such as a flash memory, a hard disk, or a solid-state drive; the memory 20 can also include a combination of the above types of memories.

[0147] The computer device further includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30, and the output device 40 may be connected through a bus or other means. Figure 6 Take the connection through the bus as an example.

[0148] The input device 30 can receive input digital or character information, and generate key signal inputs related to the user settings and function controls of the computer device, such as a touch screen, a keypad, a mouse, a trackpad, a touchpad, a pointing stick, one or more mouse buttons, a trackball, a joystick, etc. The output device 40 may include a display device, an auxiliary lighting device (e.g., an LED), and a haptic feedback device (e.g., a vibration motor), etc. The above display device includes but is not limited to a liquid crystal display, a light emitting diode, a display, and a plasma display. In some alternative embodiments, the display device may be a touch screen.

[0149] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or be implemented as computer code that can be recorded on a storage medium, or be implemented as computer code that is originally stored in a remote storage medium or a non-transitory machine-readable storage medium and downloaded through a network and will be stored in a local storage medium, so that the method described herein can be stored as such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium may be a magnetic disk, an optical disk, a read-only memory, a random access memory, a flash memory, a hard disk, or a solid-state drive, etc.; further, the storage medium may also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code, and when the software or computer code is accessed and executed by the computer, the processor, or the hardware, the method shown in the above embodiments is implemented.

[0150] A part of the present invention can be applied as a computer program product, such as computer program instructions, which when executed by a computer, can call or provide the method and / or technical solution according to the present invention through the operation of the computer. Those skilled in the art should be able to understand that the forms of existence of computer program instructions in a computer-readable medium include but are not limited to source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include but are not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to the computer.

[0151] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A method for detecting an arc fault, characterized in that: Applied to an arc fault circuit breaker, the method comprises: According to the preset load type and the preset standard power usage scenario connected to the arc fault circuit breaker, different gears are set for the arc fault circuit breaker and the arc fault detection sensitivity corresponding to the different gears; When a load is connected to the arc fault circuit breaker and the arc fault circuit breaker is operating in the initial gear, determining whether the arc fault circuit breaker malfunctions when it is confirmed that no arc fault occurs; When the arc fault circuit breaker malfunctions, the arc fault detection sensitivity of the arc fault circuit breaker is adjusted by selecting a corresponding gear different from an initial gear according to the load type connected to the arc fault circuit breaker, and the arc fault is detected based on the adjusted arc fault detection sensitivity.

2. The method according to claim 1, characterized in that The preset load types include known loads and unknown loads; When the connected preset load type is a known load and meets the preset standard power usage scenario, the working gear of the arc fault circuit breaker is set to the standard gear, and the arc fault detection sensitivity corresponding to the standard gear is set to the preset standard power usage scenario sensitivity, and the standard gear is used as the initial gear of the arc fault circuit breaker; When the preset load type connected is a known load and does not meet the preset standard power usage scenario, the working gear of the arc fault circuit breaker is set to AUTO gear, and the arc fault detection sensitivity of the arc fault circuit breaker in AUTO gear is set according to the known load; When the preset load type connected is an unknown load, the working gear of the arc fault circuit breaker is set to the learning gear, and the arc fault detection sensitivity of the arc fault circuit breaker in the learning gear is set according to the unknown load and the learning result; When the connected preset load type is a known load, and the working gear of the arc fault detection sensitivity is set to the first protection gear and the second protection gear of the arc fault circuit breaker based on the preset standard power usage scenario and user needs, among which, the arc fault detection sensitivity of the first protection gear is less than the arc fault detection sensitivity of the standard gear, and the arc fault detection sensitivity of the second protection gear is less than the arc fault detection sensitivity of the second protection gear.

3. The method according to claim 2, characterized in that When a load is connected to the arc fault circuit breaker and the arc fault circuit breaker is working in the initial gear, determining whether the arc fault circuit breaker malfunctions when it is confirmed that no arc fault occurs includes: When a load is connected to the arc fault circuit breaker and it is working in the standard gear, arc fault detection is performed on the actual working condition of the arc fault circuit breaker according to the preset standard power usage scenario and the arc fault detection sensitivity corresponding to the standard gear; When no arc fault occurs, it is determined whether the arc fault circuit breaker malfunctions.

4. The method according to claim 2, characterized in that: When the arc fault circuit breaker malfunctions, the arc fault detection sensitivity of the arc fault circuit breaker is adjusted by selecting a corresponding gear different from an initial gear according to a load type connected to the arc fault circuit breaker, and the arc fault is detected based on the adjusted arc fault detection sensitivity, including: When the arc fault circuit breaker malfunctions, if the load type is a known load, the AUTO gear is selected to adjust the arc fault detection sensitivity of the arc fault circuit breaker based on the known load, and the arc fault is detected based on the adjusted arc fault detection sensitivity; When the arc fault circuit breaker malfunctions, if the load type is an unknown load, the learning file is selected to perform self-learning based on the working conditions of each malfunction, and the arc fault detection sensitivity of the arc fault circuit breaker is adjusted based on the result of each self-learning and the unknown load, and the arc fault is detected based on the adjusted arc fault detection sensitivity.

5. The method according to claim 2, characterized in that: When the arc fault circuit breaker malfunctions, the arc fault detection sensitivity of the arc fault circuit breaker is adjusted by selecting a corresponding gear different from an initial gear according to a load type connected to the arc fault circuit breaker, and the arc fault is detected based on the adjusted arc fault detection sensitivity, further comprising: When the arc fault circuit breaker malfunctions, if the load type is a known load, protection level 1 or protection level 2 is selected according to user needs, and the arc fault is directly detected using the set arc fault detection sensitivity of protection level 1 or arc fault detection sensitivity of protection level 2.

6. The method according to claim 4, characterized in that Before selecting the AUTO gear to adjust the arc fault detection sensitivity of the arc fault circuit breaker based on the known load, the method further includes: Detect the current signal before and after the arc fault circuit breaker malfunctions when a known load is connected; A current signal characteristic threshold when an arc fault occurs in a known load is determined based on the current signal before the malfunction and the current signal after the malfunction, and the current signal characteristic threshold when an arc fault occurs in the known load is stored in a preset load library.

7. The method according to claim 6, characterized in that The selecting of the AUTO gear adjusts the arc fault detection sensitivity of the arc fault circuit breaker based on a known load, including: Using the AUTO gear to identify known loads, and matching the corresponding known loads and the corresponding current signal characteristic thresholds when an arc fault occurs in the preset load library; The arc fault detection sensitivity of the arc fault circuit breaker in the AUTO gear is adjusted based on the current signal characteristic threshold when an arc fault occurs in a known load in the preset load library.

8. The method according to claim 6, characterized in that Select the learning profile to perform self-learning based on the working conditions of each false operation, and adjust the arc fault detection sensitivity of the arc fault circuit breaker based on the results of each self-learning and the unknown load, including: Collect the current signal of each malfunction of the arc fault circuit breaker when an unknown load is connected, and input it into the pre-trained deep learning neural network in the learning file to identify the load type, convert the unknown load into a known load and store it in the preset load library; Matching the corresponding known load and the corresponding current signal characteristic threshold when an arc fault occurs in the preset load library; The arc fault detection sensitivity of the arc fault circuit breaker in the learning gear is adjusted based on the current signal characteristic threshold when an arc fault occurs in a known load in a preset load library.

9. An arc fault detection device, characterized in that: Applied to an arc fault circuit breaker, the device comprises: The gear and sensitivity setting module is used to set different gears for the arc fault circuit breaker and the arc fault detection sensitivity corresponding to different gears according to the preset load type and the preset standard power usage scenario connected to the arc fault circuit breaker; A malfunction judgment module, used for judging whether the arc fault circuit breaker malfunctions when a load is connected to the arc fault circuit breaker and the arc fault circuit breaker is working in the initial gear and it is confirmed that no arc fault occurs; The sensitivity adjustment and arc fault detection module is used to adjust the arc fault detection sensitivity of the arc fault circuit breaker by selecting a corresponding gear different from the initial gear according to the load type connected to the arc fault circuit breaker when the arc fault circuit breaker malfunctions, and detect the arc fault based on the adjusted arc fault detection sensitivity.

10. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the arc fault detection method according to any one of claims 1 to 7 by executing the computer instructions.

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