Arc fault detection method, apparatus and device, storage medium, and electronic device

Abstract

The application discloses an arc fault detection method, device and equipment, a storage medium and an electronic device. The device comprises an arc detection module connected with a power grid and a load respectively, and configured to detect whether a fault arc occurs according to a voltage on the power grid side and a voltage on the load side; a tripper connected between the power grid and the load and connected with the arc detection module, and configured to disconnect the connection between the load and the power grid in the case of the fault arc. Thus, a series type arc fault detection scheme suitable for household appliances such as air conditioners is provided, the fault arc is sensitive and has the ability of direct tripping, and the technical problem of poor safety of an existing fault arc protector can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric safety, in particular to an arc fault detection method, device and equipment, storage medium and electronic equipment. BACKGROUND

[0002] The maximum current of a household air conditioner line load during operation can reach 25A, which is much larger than that of other household appliances. If the air conditioner in operation has poor wiring, damaged wires, or a plug that is not properly plugged in, it may produce a fault arc (commonly known as "firing"). The current during the occurrence of a fault arc is much smaller than that during a short circuit, but it can cause a very high arc temperature. A high-temperature arc is enough to ignite the surrounding combustible materials and cause a fire.

[0003] Existing fault arc protectors are generally suitable for buildings, and the fault arc detection effect is poor (not sensitive, and there is a misoperation of the power grid load), so they are basically in the form of alarms and are only used as reminders.

[0004] In view of the poor safety of the existing fault arc protector, an effective solution has not yet been proposed. SUMMARY

[0005] The purpose of the present application is to overcome the above technical deficiencies and provide an arc fault detection method, device and equipment, storage medium and electronic equipment to at least solve the technical problem of poor safety of existing fault arc protectors.

[0006] To achieve the above technical purpose, the present application adopts the following technical solutions:

[0007] According to an aspect of an embodiment of the present application, an arc fault detection device is provided, comprising: an arc detection module connected to a power grid and a load, respectively, for detecting whether a fault arc occurs according to a power grid side voltage and a load side voltage; a trip connected between the power grid and the load, connected to the arc detection module, for disconnecting the connection between the load and the power grid in the case of a fault arc.

[0008] Optionally, the arc fault detection device further comprises a filter, one end of the filter being connected to a first node with a live wire of the power grid, the other end of the filter being connected to a second node with a neutral wire of the power grid, and the filter being used for filtering.

[0009] Optionally, the arc detection module includes: two voltage sampling modules, one of which is connected to the live wire of the power grid at a third node, and the other of which is connected to the live wire of the power grid at a fourth node; the first node is located between the third node and the fourth node, and the two voltage sampling modules are used to collect the grid-side voltage before filtering and the load-side voltage after filtering.

[0010] Optionally, each voltage sampling module includes: a voltage sampling circuit for acquiring the grid-side voltage before filtering or the load-side voltage after filtering; a bandpass filter circuit connected to the voltage sampling circuit for filtering the sampled voltage of the voltage sampling circuit; an operational amplifier circuit connected to the bandpass filter circuit for operational amplifier processing of the output of the bandpass filter circuit; a voltage comparison circuit connected to the operational amplifier circuit for comparing the output of the operational amplifier circuit with a reference voltage; and a judgment circuit connected to the voltage comparison circuit for determining whether a fault arc has occurred based on the output of the voltage comparison circuit.

[0011] Optionally, the arc fault detection device further includes: a switching power supply, connected to the power grid and the arc detection module respectively, for stepping down the voltage of the power grid to supply power to the arc detection module; terminals for connecting to the power grid and the load; and a switch housing in which the terminals, the arc detection module, the switching power supply, and the trip unit are installed.

[0012] According to another aspect of the embodiments of this application, an arc fault detection method is provided, comprising: acquiring grid-side voltage near the power grid and load-side voltage near the load; detecting whether a fault arc has occurred based on the grid-side voltage and the load-side voltage; and disconnecting the connection between the load and the power grid if a fault arc is detected.

[0013] Optionally, detecting whether a fault arc has occurred based on the grid-side voltage and the load-side voltage includes: acquiring a load-side high-frequency count value P obtained by adjusting the load-side voltage. 内 and the rate of change C; if the load-side high-frequency count value P of the current time period 内 If the value of the load-side high-frequency count P is not greater than the corresponding first threshold and / or the rate of change C is not greater than the corresponding second threshold, then it is determined that no fault arc has occurred; if the current time period's load-side high-frequency count value P 内 If the value is greater than the corresponding first threshold and the rate of change C is greater than the corresponding second threshold, then A is counted over k consecutive periods. 计数值 and A 变化率 A 计数值 The high-frequency count value P on the load side over k consecutive cycles内 The number of times A is greater than the corresponding first threshold 变化率 The number of times the rate of change C is greater than the corresponding second threshold within k consecutive periods, where the current time period is the last time period; if A 计数值 Not greater than the third threshold and / or A 变化率 If the value is not greater than the fourth threshold, then it is determined that no fault arc has occurred; if A 计数值 Greater than the third threshold and A 变化率 If the value is greater than the fourth threshold, a suspected fault arc is identified, and the grid-side high-frequency count value P, obtained by adjusting the grid-side voltage, is acquired. 外 If the high-frequency count value P on the load side within k consecutive cycles 内 With the high-frequency count value P on the grid side 外 If the average difference between the values ​​does not exceed the fifth threshold, it is determined that no fault arc has occurred; if the high-frequency count value P on the load side exceeds the threshold for k consecutive cycles, it is determined that no fault arc has occurred. 内 With the high-frequency count value P on the grid side 外 If the average of the differences between them exceeds the fifth threshold, a fault arc is determined to have occurred.

[0014] According to another aspect of the embodiments of this application, an arc fault detection device is also provided, comprising: a data acquisition unit for acquiring grid-side voltage near the power grid and load-side voltage near the load; a detection unit for detecting whether a fault arc has occurred based on the grid-side voltage and the load-side voltage; and a protection unit for disconnecting the connection between the load and the power grid when a fault arc is detected.

[0015] Optionally, the detection unit is further configured to: acquire the load-side high-frequency count value P obtained by adjusting the load-side voltage. 内 and the rate of change C; if the load-side high-frequency count value P of the current time period 内 If the value of the load-side high-frequency count P is not greater than the corresponding first threshold and / or the rate of change C is not greater than the corresponding second threshold, then it is determined that no fault arc has occurred; if the current time period's load-side high-frequency count value P 内 If the value is greater than the corresponding first threshold and the rate of change C is greater than the corresponding second threshold, then A is counted over k consecutive periods. 计数值 and A 变化率 A 计数值 The high-frequency count value P on the load side over k consecutive cycles 内 The number of times A exceeds the corresponding first threshold 变化率 The number of times the rate of change C is greater than the corresponding second threshold within k consecutive periods, where the current time period is the last time period; if A 计数值 Not greater than the third threshold and / or A 变化率 If the value is not greater than the fourth threshold, then it is determined that no fault arc has occurred; if A计数值 Greater than the third threshold and A 变化率 If the value is greater than the fourth threshold, a suspected fault arc is identified, and the grid-side high-frequency count value P, obtained by adjusting the grid-side voltage, is acquired. 外 If the high-frequency count value P on the load side within k consecutive cycles 内 With the high-frequency count value P on the grid side 外 If the average difference between the values ​​does not exceed the fifth threshold, it is determined that no fault arc has occurred; if the high-frequency count value P on the load side exceeds the threshold for k consecutive cycles, it is determined that no fault arc has occurred. 内 With the high-frequency count value P on the grid side 外 If the average of the differences between them exceeds the fifth threshold, a fault arc is determined to have occurred.

[0016] According to another aspect of the embodiments of this application, the present invention also provides an electronic device, including: a processor and a memory; the memory stores a computer-readable program that can be executed by the processor; when the processor executes the computer-readable program, it implements the steps in the above-described method.

[0017] According to another aspect of the embodiments of this application, the present invention also provides a computer-readable storage medium storing one or more programs that can be executed by one or more processors to implement the steps in the above-described method.

[0018] In this embodiment, the arc fault detection device includes: an arc detection module connected to both the power grid and the load, used to detect whether an arc fault has occurred based on the grid-side voltage and the load-side voltage; and a trip unit connected between the power grid and the load, and connected to the arc detection module, used to disconnect the load from the power grid in the event of an arc fault. This provides a series-type arc fault detection solution suitable for household appliances such as air conditioners, which is sensitive to arc faults and has the ability to directly trip, thus solving the technical problem of poor safety in existing arc fault protectors. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an optional arc fault detection device according to an embodiment of this application;

[0020] Figure 2 This is a flowchart of an optional arc fault detection method according to an embodiment of this application;

[0021] Figure 3 This is a schematic diagram of an optional voltage sampling module according to an embodiment of this application;

[0022] Figure 4 This is a schematic diagram of an optional arc fault detection scheme according to an embodiment of this application;

[0023] Figure 5 This is a schematic diagram of an optional arc fault detection device according to an embodiment of this application;

[0024] Figure 6 This is a structural block diagram of a terminal according to an embodiment of this application. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0026] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0027] After analyzing relevant technologies, the inventors realized that air conditioners have a relatively simple load, and traditional fault arc detection methods are not very effective, mainly because they are not sensitive to fault arcs (e.g., they cannot be detected under low current conditions such as standby, fan operation, and low-frequency operation). In addition, traditional fault arc detection is based on current signals, which requires current transformers, which are large in size, have complex circuit designs, and have complex current characteristic judgment models.

[0028] Based on the stable electrical signals during normal operation of an air conditioner and the strong commonalities of arc fault signals, according to one aspect of this application, an embodiment of an arc fault detection device is provided. This arc fault detection device can exist in the form of products such as AFDD protection panel switches. Figure 1 As shown, it includes:

[0029] The arc detection module is connected to the power grid and the load respectively, and is used to detect whether a fault arc has occurred based on the voltage on the power grid side and the voltage on the load side.

[0030] A trip unit, connected between the power grid and the load, and connected to the arc detection module, is used to disconnect the load from the power grid in the event of a fault arc.

[0031] In the technical solution of this application, the arc fault detection device includes: an arc detection module, connected to both the power grid and the load, used to detect whether an arc fault has occurred based on the voltage on the power grid side and the voltage on the load side; and a trip unit, connected between the power grid and the load, and connected to the arc detection module, used to disconnect the connection between the load and the power grid in the event of an arc fault. This provides a series-type arc fault detection solution suitable for household appliances such as air conditioners, which is sensitive to arc faults and has the ability to directly trip, thus solving the technical problem of poor safety in existing arc fault protectors.

[0032] Optionally, the arc fault detection device may further include: a filter, one end of which is connected to the live wire of the power grid at a first node J1, and the other end of which is connected to the neutral wire of the power grid at a second node J2, the filter being used for filtering; a switching power supply, connected to both the power grid and the arc detection module, for stepping down the voltage of the power grid to supply power to the arc detection module; terminals for connecting to the power grid and the load; and a switch housing, in which the terminals, the arc detection module, the switching power supply, and the trip unit are installed.

[0033] The aforementioned arc detection module includes: two voltage sampling modules, one of which is connected to the live wire of the power grid at a third node J3, and the other of which is connected to the live wire of the power grid at a fourth node J4; the first node is located between the third node and the fourth node, and the two voltage sampling modules are used to collect the grid-side voltage before filtering and the load-side voltage after filtering.

[0034] Optionally, each voltage sampling module includes: a voltage sampling circuit for acquiring the grid-side voltage before filtering or the load-side voltage after filtering; a bandpass filter circuit connected to the voltage sampling circuit for filtering the sampled voltage of the voltage sampling circuit; an operational amplifier circuit connected to the bandpass filter circuit for operational amplifier processing of the output of the bandpass filter circuit; a voltage comparison circuit connected to the operational amplifier circuit for comparing the output of the operational amplifier circuit with a reference voltage; and a judgment circuit connected to the voltage comparison circuit for determining whether a fault arc has occurred based on the output of the voltage comparison circuit.

[0035] To address the issues of insensitivity and complex signal processing in traditional current-based arc fault detection, this application provides an arc fault detection device that is small in size, has a simple hardware design, and is characterized by sensitive operation and ease of implementation. It is suitable for household appliances such as air conditioners.

[0036] According to another aspect of the embodiments of this application, an embodiment of an arc fault detection method is also provided. Figure 2 This is a flowchart of an optional arc fault detection method according to an embodiment of this application, such as... Figure 2 As shown, the method may include the following steps:

[0037] Step S1: Collect the grid-side voltage near the power grid and the load-side voltage near the load.

[0038] Step S2: Detect whether a fault arc has occurred based on the grid-side voltage and the load-side voltage.

[0039] Step S2 above can be achieved in the following way:

[0040] Obtain the load-side high-frequency count value P obtained by adjusting the load-side voltage. 内 and the rate of change C;

[0041] If the load-side high-frequency count value P in the current time period 内 If the value is not greater than the corresponding first threshold and / or the rate of change C is not greater than the corresponding second threshold, then it is determined that no fault arc has occurred.

[0042] If the load-side high-frequency count value P in the current time period 内 If the value is greater than the corresponding first threshold and the rate of change C is greater than the corresponding second threshold, then A is counted over k consecutive periods. 计数值 and A 变化率 A 计数值 The high-frequency count value P on the load side over k consecutive cycles 内 The number of times A exceeds the corresponding first threshold 变化率 The number of times the rate of change C is greater than the corresponding second threshold within k consecutive periods, wherein the current time period is the last time period;

[0043] If A 计数值 Not greater than the third threshold and / or A 变化率 If the value is not greater than the fourth threshold, then it is determined that no fault arc has occurred;

[0044] If A 计数值 Greater than the third threshold and A 变化率 If the value is greater than the fourth threshold, a suspected fault arc is identified, and the grid-side high-frequency count value P, obtained by adjusting the grid-side voltage, is acquired. 外 ;

[0045] If the high-frequency count value P on the load side within k consecutive cycles 内 With the high-frequency count value P on the grid side 外 If the average of the differences between them does not exceed the fifth threshold, it is determined that no fault arc has occurred;

[0046] If the high-frequency count value P on the load side within k consecutive cycles 内 With the high-frequency count value P on the grid side 外 If the average of the differences between them exceeds the fifth threshold, a fault arc is determined to have occurred.

[0047] Step S3: If a fault arc is detected, disconnect the load from the power grid.

[0048] As an optional embodiment, the technical solution of this application is further described in detail below with reference to specific implementation methods.

[0049] The protector product of this application can be an 86-type wall panel switch (or other forms as needed), mainly including: a switch housing, a fault arc detection module, a trip unit, a switching power supply circuit board, and terminals. The fault arc detection module, switching power supply circuit board, trip unit, and terminals are all installed in the switch housing. The switching power supply circuit board supplies power to the fault arc detection board. The main circuit diagram is shown below. Figure 1 As shown.

[0050] (1) Switching power supply (i.e., switching power supply module or switching power supply circuit board): Converts 220V mains power to 5V or 3.3V to power the fault arc detection module.

[0051] (2) Pre-stage filter: The power grid input side uses filter capacitors (0.8uF-2uF) or inductors to filter, in order to reduce high-frequency noise generated by power grid disturbances (i.e., unstable bypass loads) and avoid false alarms in fault arc detection.

[0052] (3) Tripping device: The tripping is performed by an electromagnetic coil and is controlled by the fault arc detection module.

[0053] (4) Fault Arc Detection Module: This module consists of two voltage signal sampling stages, one before and one after the filter (i.e., two voltage sampling modules). The first stage primarily collects the voltage signal from the unfiltered grid side, while the second stage primarily collects the filtered load-side voltage signal. Each stage includes a voltage sampling circuit, a bandpass filter circuit, an operational amplifier circuit, a voltage comparison circuit, and an accumulation counting unit (i.e., a judgment circuit). Figure 3 As shown, the two signals are processed and sent to the main control unit for arc detection. The specific circuit descriptions of each unit are as follows:

[0054] Voltage sampling circuit: Implemented through a resistor-divided voltage sampling circuit;

[0055] Bandpass filter circuit: First-order or second-order filter, the bandpass filter selects the 10K-100K frequency band, and the obtained after filtering is the high-frequency component of the main circuit voltage. Considering the wide frequency range of the high-frequency signal of the fault arc, while the high-frequency energy of the voltage signal of the main load high-frequency device of the air conditioner is small, the bandpass filter selects the 10K-100K frequency band, which can reasonably avoid the influence of the air conditioner switching device, and form a differentiation by the high high-frequency energy of the arc when it occurs in this band.

[0056] Comparison circuit: By comparing with a reference voltage signal, which is the upper limit voltage obtained when the air conditioner is operating normally under various conditions, the high-frequency part of the air conditioner's normal operation is filtered out, reducing the influence of background noise signal. When there is a fault arc, the high-frequency noise of the voltage signal will increase and exceed the reference voltage, so a high level will be output.

[0057] Accumulator Counting Unit: The accumulator counting unit is implemented through the main control software. The main control unit acquires the comparison results from the comparison circuit, and collects N high-level data points N times per power frequency cycle (e.g., 20ms) and accumulates the count P (denoted as the high-frequency accumulator count value). N takes a value between 10000 and 100000. At the end of each power frequency cycle, the accumulated count is reset to zero and the counting restarts. The accumulator count values ​​for k consecutive cycles are acquired and denoted as: P1, P2, P3, P4, ... P k .

[0058] Main control unit: The fault arc detection principle is achieved by analyzing the high-frequency energy and randomness of the preset frequency band of the main circuit. The main control unit uses the cumulative count value P generated by the internal and external voltage signals to evaluate the high-frequency energy; and calculates it using the three-cycle method C. 变化率 =(P k-1 +P k+1 ) / P k Or the previous and subsequent period calculation method C 变化率 =P k-1 / P k To calculate the randomness of high-frequency signals.

[0059] The fault arc detection process, such as Figure 4 As shown, the steps are as follows:

[0060] (1) The main control unit acquires the accumulated high-frequency count value P of the internal voltage signal adjustment and processing. 内 and the rate of change C 变化率 .

[0061] (2) Determine the high-frequency count value P 内 And whether the rate of change C exceeds the threshold.

[0062] (3) If the threshold is exceeded, then the high-frequency count value P for k consecutive cycles is further counted. 内And the number of periods A in which the rate of change C exceeds the threshold. 计数 A 变化率 .

[0063] (4) Determine the number of cycles A 计数值 A 变化率 Is it greater than the threshold?

[0064] (5) If the threshold is exceeded, mark the suspected arc state. Further obtain the high-frequency count value P of the outer voltage signal. 外 .

[0065] (6) Determine the high-frequency count value P over k cycles 内 With P 外 Does the average of the differences exceed a preset threshold?

[0066] (7) If the threshold is exceeded, it is determined that a fault arc has occurred on the inner side and tripping protection is performed.

[0067] This application designs a wall-mounted panel switch that integrates a fault arc detection module and a trip unit to provide protection when an arc fault occurs inside the air conditioner. A filter is used to filter noise from the main circuit on the power grid side to avoid grid interference. Voltage samples at both ends of the filter acquire the high-frequency components of the inner voltage (i.e., the load-side voltage) and the outer high-frequency components (i.e., the grid-side voltage), respectively. The energy and randomness of the high-frequency signals, as well as the difference between the inner and outer high-frequency signals, are used to determine whether an arc fault has occurred on the load side of the air conditioner.

[0068] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0069] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0070] According to another aspect of the embodiments of this application, an arc fault detection device for implementing the above-described arc fault detection method is also provided. Figure 5 This is a schematic diagram of an optional arc fault detection device according to an embodiment of this application, as shown below. Figure 5 As shown, the device may include:

[0071] The acquisition unit 51 is used to acquire the grid-side voltage near the power grid and the load-side voltage near the load; the detection unit 53 is used to detect whether a fault arc has occurred based on the grid-side voltage and the load-side voltage; the protection unit 55 is used to disconnect the connection between the load and the power grid when a fault arc is detected.

[0072] Optionally, the detection unit is further configured to: acquire the load-side high-frequency count value P obtained by adjusting the load-side voltage. 内 and the rate of change C; if the load-side high-frequency count value P of the current time period 内 If the value of the load-side high-frequency count P is not greater than the corresponding first threshold and / or the rate of change C is not greater than the corresponding second threshold, then it is determined that no fault arc has occurred; if the current time period's load-side high-frequency count value P 内 If the value is greater than the corresponding first threshold and the rate of change C is greater than the corresponding second threshold, then A is counted over k consecutive periods. 计数值 and A 变化率 A 计数值 The high-frequency count value P on the load side over k consecutive cycles 内 The number of times A exceeds the corresponding first threshold 变化率 The number of times the rate of change C is greater than the corresponding second threshold within k consecutive periods, where the current time period is the last time period; if A 计数值 Not greater than the third threshold and / or A 变化率 If the value is not greater than the fourth threshold, then it is determined that no fault arc has occurred; if A 计数值 Greater than the third threshold and A 变化率 If the value is greater than the fourth threshold, a suspected fault arc is identified, and the grid-side high-frequency count value P, obtained by adjusting the grid-side voltage, is acquired. 外 If the high-frequency count value P on the load side within k consecutive cycles 内 With the high-frequency count value P on the grid side 外 If the average difference between the values ​​does not exceed the fifth threshold, it is determined that no fault arc has occurred; if the high-frequency count value P on the load side exceeds the threshold for k consecutive cycles, it is determined that no fault arc has occurred. 内 With the high-frequency count value P on the grid side 外 If the average of the differences between them exceeds the fifth threshold, a fault arc is determined to have occurred.

[0073] It should be noted that the examples and application scenarios implemented by the above modules and corresponding steps are the same, but are not limited to the content disclosed in the above embodiments. It should also be noted that the above modules, as part of the device, can run in a corresponding hardware environment, and can be implemented through software or hardware, wherein the hardware environment includes a network environment.

[0074] According to another aspect of the embodiments of this application, a server or terminal for implementing the above-described arc fault detection method is also provided.

[0075] Figure 6 This is a structural block diagram of a terminal according to an embodiment of this application, such as... Figure 6 As shown, the terminal may include: one or more (only one is shown) processors 601, memory 603, and transmission devices 605, such as... Figure 6 As shown, the terminal may also include input / output devices 607.

[0076] The memory 603 can be used to store software programs and modules, such as the program instructions / modules corresponding to the arc fault detection method and device in this embodiment. The processor 601 executes various functional applications and data processing by running the software programs and modules stored in the memory 603, thereby realizing the aforementioned arc fault detection method. The memory 603 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 603 may further include memory remotely located relative to the processor 601, and these remote memories can be connected to the terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0077] The aforementioned transmission device 605 is used to receive or send data via a network, and can also be used for data transfer between the processor and memory. Specific examples of the network described above may include wired networks and wireless networks. In one example, the transmission device 605 includes a Network Interface Controller (NIC), which can be connected to other network devices and a router via a network cable to communicate with the Internet or a local area network. In another example, the transmission device 605 is a radio frequency (RF) module used for wireless communication with the Internet.

[0078] Specifically, memory 603 is used to store application programs.

[0079] The processor 601 can invoke the application program stored in the memory 603 via the transmission device 605 to perform the following steps:

[0080] Collect the grid-side voltage near the power grid and the load-side voltage near the load; detect whether a fault arc has occurred based on the grid-side voltage and the load-side voltage; if a fault arc is detected, disconnect the load from the power grid.

[0081] Processor 601 is also used to perform the following steps:

[0082] Obtain the load-side high-frequency count value P obtained by adjusting the load-side voltage. 内 and the rate of change C; if the load-side high-frequency count value P of the current time period 内 If the value of the load-side high-frequency count P is not greater than the corresponding first threshold and / or the rate of change C is not greater than the corresponding second threshold, then it is determined that no fault arc has occurred; if the current time period's load-side high-frequency count value P 内 If the value is greater than the corresponding first threshold and the rate of change C is greater than the corresponding second threshold, then A is counted over k consecutive periods. 计数值 and A 变化率 A 计数值 The high-frequency count value P on the load side over k consecutive cycles 内 The number of times A exceeds the corresponding first threshold 变化率 The number of times the rate of change C is greater than the corresponding second threshold within k consecutive periods, where the current time period is the last time period; if A 计数值 Not greater than the third threshold and / or A 变化率 If the value is not greater than the fourth threshold, then it is determined that no fault arc has occurred; if A 计数值 Greater than the third threshold and A 变化率 If the value is greater than the fourth threshold, a suspected fault arc is identified, and the grid-side high-frequency count value P, obtained by adjusting the grid-side voltage, is acquired. 外 If the high-frequency count value P on the load side within k consecutive cycles 内 With the high-frequency count value P on the grid side 外 If the average difference between the values ​​does not exceed the fifth threshold, it is determined that no fault arc has occurred; if the high-frequency count value P on the load side exceeds the threshold for k consecutive cycles, it is determined that no fault arc has occurred. 内 With the high-frequency count value P on the grid side 外 If the average of the differences between them exceeds the fifth threshold, a fault arc is determined to have occurred.

[0083] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0084] Those skilled in the art will understand that Figure 6The structure shown is for illustrative purposes only. The terminal can be a smartphone (such as an Android phone, an iOS phone, etc.), a tablet computer, a PDA, a mobile internet device (MID), a PAD, or other terminal devices. Figure 6 This does not limit the structure of the aforementioned electronic devices. For example, the terminal may also include components that are more... Figure 6 The more or fewer components shown (such as network interfaces, display devices, etc.), or having the same ​ The different configurations shown.

[0085] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing the hardware related to the terminal device. The program can be stored in a computer-readable storage medium, which may include: flash drive, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc.

[0086] Embodiments of this application also provide a storage medium. Optionally, in this embodiment, the storage medium can be used to execute program code for an arc fault detection method.

[0087] Optionally, in this embodiment, the storage medium may be located on at least one of the multiple network devices in the network shown in the above embodiment.

[0088] Optionally, in this embodiment, the storage medium is configured to store program code for performing the following steps:

[0089] Collect the grid-side voltage near the power grid and the load-side voltage near the load; detect whether a fault arc has occurred based on the grid-side voltage and the load-side voltage; if a fault arc is detected, disconnect the load from the power grid.

[0090] Optionally, the storage medium is also configured to store program code for performing the following steps:

[0091] Obtain the load-side high-frequency count value P obtained by adjusting the load-side voltage. 内 and the rate of change C; if the load-side high-frequency count value P of the current time period 内 If the value of the load-side high-frequency count P is not greater than the corresponding first threshold and / or the rate of change C is not greater than the corresponding second threshold, then it is determined that no fault arc has occurred; if the current time period's load-side high-frequency count value P 内 If the value is greater than the corresponding first threshold and the rate of change C is greater than the corresponding second threshold, then A is counted over k consecutive periods. 计数值 and A 变化率A 计数值 The high-frequency count value P on the load side over k consecutive cycles 内 The number of times A exceeds the corresponding first threshold 变化率 The number of times the rate of change C is greater than the corresponding second threshold within k consecutive periods, where the current time period is the last time period; if A 计数值 Not greater than the third threshold and / or A 变化率 If the value is not greater than the fourth threshold, then it is determined that no fault arc has occurred; if A 计数值 Greater than the third threshold and A 变化率 If the value is greater than the fourth threshold, a suspected fault arc is identified, and the grid-side high-frequency count value P, obtained by adjusting the grid-side voltage, is acquired. 外 If the high-frequency count value P on the load side within k consecutive cycles 内 With the high-frequency count value P on the grid side 外 If the average difference between the values ​​does not exceed the fifth threshold, it is determined that no fault arc has occurred; if the high-frequency count value P on the load side exceeds the threshold for k consecutive cycles, it is determined that no fault arc has occurred. 内 With the high-frequency count value P on the grid side 外 If the average of the differences between them exceeds the fifth threshold, a fault arc is determined to have occurred.

[0092] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0093] Optionally, in this embodiment, the storage medium may include, but is not limited to, various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0094] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0095] If the integrated units in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in the aforementioned computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause one or more computer devices (which may be personal computers, servers, or network devices, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.

[0096] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0097] In the several embodiments provided in this application, it should be understood that the disclosed client can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, indirect coupling or communication connection between units or modules, and may be electrical or other forms.

[0098] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0099] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0100] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A method for detecting electric arc faults, characterized in that, include: Collect the grid-side voltage near the power grid and the load-side voltage near the load; Detect whether a fault arc has occurred based on the grid-side voltage and the load-side voltage; If a fault arc is detected, disconnect the load from the power grid; Detecting whether a fault arc has occurred based on the grid-side voltage and the load-side voltage includes: Obtain the load-side high-frequency count value P obtained by adjusting the load-side voltage. 内 and the rate of change C; If the load-side high-frequency count value P in the current time period 内 If the value is not greater than the corresponding first threshold and / or the rate of change C is not greater than the corresponding second threshold, then it is determined that no fault arc has occurred. If the load-side high-frequency count value P in the current time period 内 If the value is greater than the corresponding first threshold and the rate of change C is greater than the corresponding second threshold, then A is counted over k consecutive periods. 计数值 and A 变化率 A 计数值 The high-frequency count value P on the load side over k consecutive cycles 内 The number of times A exceeds the corresponding first threshold 变化率 The number of times the rate of change C is greater than the corresponding second threshold within k consecutive periods, wherein the current time period is the last time period; If A 计数值 Not greater than the third threshold and / or A 变化率 If the value is not greater than the fourth threshold, then it is determined that no fault arc has occurred; If A 计数值 Greater than the third threshold and A 变化率 If the value is greater than the fourth threshold, a suspected fault arc is identified, and the grid-side high-frequency count value P, obtained by adjusting the grid-side voltage, is acquired. 外 ; If the high-frequency count value P on the load side within k consecutive cycles 内 With the high-frequency count value P on the grid side 外 If the average of the differences between them does not exceed the fifth threshold, it is determined that no fault arc has occurred; If the high-frequency count value P on the load side within k consecutive cycles 内 With the high-frequency count value P on the grid side 外 If the average of the differences between them exceeds the fifth threshold, a fault arc is determined to have occurred.

2. An arc fault detection device, characterized in that, The arc fault detection method according to claim 1, wherein the arc fault detection device comprises: The arc detection module is connected to the power grid and the load respectively, and is used to detect whether a fault arc has occurred based on the voltage on the power grid side and the voltage on the load side. A trip unit, connected between the power grid and the load and connected to the arc detection module, is used to disconnect the load from the power grid in the event of a fault arc.

3. The arc fault detection device according to claim 2, characterized in that, The arc fault detection equipment also includes: A filter is provided, one end of which is connected to the live wire of the power grid at a first node, and the other end of which is connected to the neutral wire of the power grid at a second node. The filter is used for filtering.

4. The arc fault detection device according to claim 3, characterized in that, The arc detection module includes: Two voltage sampling modules are provided, one of which is connected to the live wire of the power grid at a third node, and the other of which is connected to the live wire of the power grid at a fourth node. The first node is located between the third node and the fourth node, and the two voltage sampling modules are used to collect the grid-side voltage before filtering and the load-side voltage after filtering.

5. The arc fault detection device according to claim 4, characterized in that, Each voltage sampling module includes: A voltage sampling circuit is used to collect the grid-side voltage before filtering or the load-side voltage after filtering. A bandpass filter circuit, connected to the voltage sampling circuit, is used to filter the sampled voltage of the voltage sampling circuit; An operational amplifier circuit, connected to the bandpass filter circuit, is used to perform operational amplifier processing on the output of the bandpass filter circuit; A voltage comparison circuit, connected to the operational amplifier circuit, is used to compare the output of the operational amplifier circuit with a reference voltage; A judgment circuit, connected to the voltage comparison circuit, is used to determine whether a fault arc has occurred based on the output of the voltage comparison circuit.

6. The arc fault detection device according to any one of claims 2 to 5, characterized in that, The arc fault detection equipment also includes: A switching power supply is connected to both the power grid and the arc detection module, and is used to step down the voltage of the power grid to supply power to the arc detection module. Terminals for connecting to the power grid and the load; The switch housing, the terminal block, the arc detection module, the switching power supply and the trip unit are installed in the switch housing.

7. An arc fault detection device, characterized in that, The arc fault detection method according to claim 1, wherein the arc fault detection device comprises: The acquisition unit is used to acquire the grid-side voltage near the power grid and the load-side voltage near the load; The detection unit is used to detect whether a fault arc has occurred based on the grid-side voltage and the load-side voltage; A protection unit is used to disconnect the load from the power grid in the event of a detected fault arc.

8. An electronic device, characterized in that, include: Processor and memory; The memory stores a computer-readable program that can be executed by the processor; When the processor executes the computer-readable program, it implements the steps of the method as described in claim 1.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores one or more programs that can be executed by one or more processors to perform the steps of the method as described in claim 1.

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