Arcing detection system
The arc detection system, composed of current sampling devices and filtering circuits, solves the problem of arc detection in photovoltaic power generation systems, enables timely identification and early warning of arcing, and improves system safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-30
- Publication Date
- 2026-03-10
AI Technical Summary
In photovoltaic power generation systems, poor contact in the DC circuit can easily cause arcing, leading to fires, and existing technologies lack effective detection methods.
An arc detection system, consisting of a current sampling device, a bandpass filter circuit, and a computational circuit, identifies the AC component signal in a specified frequency band and determines whether arcing exists in the line by acquiring current signals, filtering and performing calculations.
It enables timely detection of arcing in photovoltaic power generation systems, avoids fire risks, and improves circuit safety.
Smart Images
Figure CN121633731A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of circuit testing technology, and in particular to an arc detection system. Background Technology
[0002] With the development of photovoltaic technology, photovoltaic power stations are now widely installed in residential areas, industrial parks, and other locations. Photovoltaic power systems operate at high voltages and have numerous circuit connection points. If a connection point experiences poor contact, arcing can occur. Because photovoltaic power systems operate on direct current without a zero-crossing point, once an arc forms, it is difficult to extinguish on its own and can ignite electrical equipment, causing a fire.
[0003] Therefore, there is an urgent need for a system that can detect arcing in circuits, detect it early, and cut off the faulty circuit in time. Summary of the Invention
[0004] This application provides an arcing detection system capable of detecting arcing in power lines. The technical solution is as follows:
[0005] An arcing detection system is provided, comprising a current sampling device, a bandpass filter circuit, a signal generation circuit, and a processing circuit, wherein:
[0006] The sampling terminal of the current sampling device is connected to the circuit to be tested, and the output terminal of the current sampling device is connected to the input terminal of the bandpass filter circuit.
[0007] The output terminal of the bandpass filter circuit is connected to the first input terminal of the arithmetic circuit.
[0008] The output terminal of the signal generation circuit is connected to the second input terminal of the arithmetic circuit, and the signal generation circuit is used to output a reference AC component signal.
[0009] The arithmetic circuit is used to subtract the AC component signal input at the first input terminal from the reference AC component signal input at the second input terminal, and outputs the subtraction result through the output terminal of the arithmetic circuit. The subtraction result is used to indicate whether there is arcing in the line to be detected.
[0010] In one possible implementation, the bandpass filter circuit includes a first high-pass filter, a first low-pass filter, and a first signal amplifier, wherein:
[0011] The input terminal of the first high-pass filter is connected to the output terminal of the current sampling device, and the output terminal of the first high-pass filter is connected to the input terminal of the first low-pass filter.
[0012] The output terminal of the first low-pass filter is connected to the input terminal of the first signal amplifier;
[0013] The output terminal of the first signal amplifier is connected to the first input terminal of the operational circuit.
[0014] In one possible implementation, the cutoff frequency of the first high-pass filter is less than the cutoff frequency of the first low-pass filter.
[0015] In one possible implementation, the bandpass filter circuit further includes a second high-pass filter, a second low-pass filter, and a second signal amplifier, wherein:
[0016] The input terminal of the second high-pass filter is connected to the output terminal of the first high-pass filter;
[0017] The output of the second high-pass filter is connected to the input of the second low-pass filter;
[0018] The output of the second low-pass filter is connected to the input of the second signal amplifier;
[0019] The output terminal of the second signal amplifier is connected to the first input terminal of the operational circuit. The operational circuit is used to add the AC component signals input at the first input terminal, subtract the summed signal from the reference AC component signal input at the second input terminal, and output the subtraction result through the output terminal of the operational circuit.
[0020] In one possible implementation, the cutoff frequency of the first low-pass filter is less than the cutoff frequency of the second high-pass filter, and the cutoff frequency of the second high-pass filter is less than the cutoff frequency of the second low-pass filter.
[0021] In one possible implementation, the bandpass filter circuit further includes a third high-pass filter, a third low-pass filter, and a third signal amplifier, wherein:
[0022] The input terminal of the third high-pass filter is connected to the output terminal of the second high-pass filter;
[0023] The output of the third high-pass filter is connected to the input of the third low-pass filter;
[0024] The output terminal of the third low-pass filter is connected to the input terminal of the third signal amplifier;
[0025] The output terminal of the third signal amplifier is connected to the first input terminal of the operational circuit.
[0026] In one possible implementation, the cutoff frequency of the second low-pass filter is less than the cutoff frequency of the third high-pass filter, and the cutoff frequency of the third high-pass filter is less than the cutoff frequency of the third low-pass filter.
[0027] In one possible implementation, the bandpass filter circuit includes a first bandpass filter, a second bandpass filter, a third bandpass filter, a first signal amplifier, a second signal amplifier, and a third signal amplifier, wherein:
[0028] The input terminal of the first bandpass filter is connected to the output terminal of the current sampling device, and the output terminal of the first bandpass filter is connected to the input terminal of the first signal amplifier.
[0029] The input terminal of the second bandpass filter is connected to the output terminal of the current sampling device, and the output terminal of the second bandpass filter is connected to the input terminal of the second signal amplifier.
[0030] The input terminal of the third bandpass filter is connected to the output terminal of the current sampling device, and the output terminal of the third bandpass filter is connected to the input terminal of the third signal amplifier.
[0031] The output terminals of the first signal amplifier, the second signal amplifier, and the third signal amplifier are respectively connected to the first input terminal of the operational circuit.
[0032] In one possible implementation, there is no overlap between the passbands of the first bandpass filter, the second bandpass filter, and the third bandpass filter.
[0033] In one possible implementation, the arc detection system further includes a fourth low-pass filter, a signal scaling device, and a processor, wherein:
[0034] The input terminal of the fourth low-pass filter is connected to the output terminal of the current sampling device, and the output terminal of the fourth low-pass filter is connected to the input terminal of the signal scaling device (34).
[0035] The output terminal of the signal scaling device is connected to the processor;
[0036] The output terminal of the arithmetic circuit is connected to the processor, which is used to determine whether the line under test has arcing based on the DC component signal output from the output terminal and the subtraction result.
[0037] In one possible implementation, the cutoff frequency of the fourth low-pass filter (33) is less than the lower frequency limit of the passband of the band-pass filter circuit (2).
[0038] The beneficial effects of the technical solution provided in this application are:
[0039] In the technical solution provided in this application, a current signal in the circuit under test is acquired by a current sampling device. Then, the current signal is filtered by a bandpass filter circuit to obtain an AC component signal of a specified frequency band. Because the AC component signal of the specified frequency band has obvious characteristics when arcing occurs, the acquired AC component signal can be subtracted from a reference AC component signal by a calculation circuit. The subtraction result can then indicate whether arcing exists in the circuit under test. Attached Figure Description
[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0041] Figure 1 This is a schematic diagram of the structure of an arc detection system provided in an embodiment of this application;
[0042] Figure 2 This is a schematic diagram of the structure of an arc detection system provided in an embodiment of this application;
[0043] Figure 3 This is a schematic diagram of the structure of an arc detection system provided in an embodiment of this application;
[0044] Figure 4 This is a schematic diagram of the structure of an arc detection system provided in an embodiment of this application;
[0045] Figure 5 This is a schematic diagram of the structure of an arc detection system provided in an embodiment of this application;
[0046] Figure 6 This is a schematic diagram of the structure of an arc detection system provided in an embodiment of this application. Detailed Implementation
[0047] To facilitate understanding of the embodiments of this application, some terms involved in the embodiments of this application will be explained below.
[0048] I. Arc
[0049] Arcing is a phenomenon that generates high temperature and high energy through electric arc discharge. Its principle involves applying a sufficient voltage between two electrodes, causing electrons to accelerate under the influence of the electric field. When the electrons reach sufficiently high speeds, they collide with atoms or molecules, causing them to lose electrons and form ions. These ions continue to accelerate under the influence of the electric field, eventually forming an electric arc.
[0050] II. Hall Current Sensor
[0051] Hall current sensors are based on the magnetic balance Hall principle. According to the Hall effect principle, when a current is passed through the control current terminal of the Hall element and a magnetic field is applied in the normal direction of the plane of the Hall element, an electric potential will be generated in the direction perpendicular to the current and the magnetic field. This potential is called the Hall potential and its magnitude is proportional to the control current.
[0052] In this embodiment of the application, the Hall current sensor can be installed on the cable of the circuit to be tested to sample the current signal in the circuit.
[0053] III. Low-pass filter
[0054] A low-pass filter is an electronic filter that allows signals below the cutoff frequency to pass through, but blocks signals above the cutoff frequency.
[0055] IV. High-pass filter
[0056] A high-pass filter is an electronic filter that allows signals above the cutoff frequency to pass through, but blocks signals below the cutoff frequency.
[0057] V. Bandpass Filter
[0058] A bandpass filter is an electronic filtering device that allows signals within a specified frequency range to pass through, but blocks signals outside that range. The frequency range within which the bandpass filter allows signals to pass is called the passband.
[0059] The arc detection system provided in the embodiments of this application will be described below with reference to the accompanying drawings.
[0060] The arc detection system provided in this application embodiment can detect DC arcing and can be applied to various power generation systems such as photovoltaic power generation systems, wind power generation systems, and hydropower generation systems. In the power supply circuit of the power generation system, the voltage is high and there are many circuit connection points. If a connection point has poor contact, arcing will occur. Since DC power is transmitted, and DC power does not have a zero crossing point, once arcing is formed, it is difficult to extinguish itself and may ignite electrical equipment, causing a fire.
[0061] The technical solution provided in this application involves acquiring the current signal in the circuit under test through a current sampling device, then filtering the current signal through a bandpass filter circuit to obtain the AC component signal of a specified frequency band. Furthermore, the acquired AC component signal is subtracted from the reference AC component signal through a calculation circuit, and the subtraction result can indicate whether there is arcing in the circuit under test.
[0062] See Figure 1 The diagram shows a structural schematic of an arc detection system provided in an embodiment of this application. Figure 1As shown, the arc detection system includes a current sampling device 1, a bandpass filter circuit 2, a signal generation circuit 3, and a computational circuit 4. The sampling terminal 1A of the current sampling device 1 is connected to the line under test, and the output terminal 1B of the current sampling device 1 is connected to the input terminal of the bandpass filter circuit 2. The output terminal of the bandpass filter circuit 2 is connected to the first input terminal 4A of the computational circuit 4. The output terminal of the signal generation circuit 3 is connected to the second input terminal 4B of the computational circuit 4. The signal generation circuit 3 is used to output a reference AC component signal, which can be collected by relevant personnel under conditions where there is no arcing on the line under test, and then simulated and output by the signal generation circuit 3.
[0063] In this circuit, the current sampling device 1 can be a Hall current sensor. The sampling terminal 1A of the current sampling device 1 is connected to the circuit under test to sample the current of the circuit. The sampled current signal is output through the output terminal 1B to the input terminal of the bandpass filter circuit 2, which filters the input current signal. Because the AC component signal of a specified frequency band in the current signal has distinct characteristics when there is arcing in the circuit, the bandpass filter circuit 2 can be configured to filter the current signal and output the AC component signal of the specified frequency band. The AC component signal of the specified frequency band output by the output terminal of the bandpass filter circuit 2 is input to the first input terminal 4A of the arithmetic circuit 4. Furthermore, the output terminal of the signal generation circuit 3 is connected to the second input terminal 4B of the arithmetic circuit 4, and the signal generation circuit 3 inputs a reference AC component signal to the second input terminal 4B of the arithmetic circuit 4.
[0064] The arithmetic circuit 4 is configured to add the signal input to the first input terminal 4A, subtract the signal input to the second input terminal 4B from the signal input to the first input terminal 4A, and output the subtraction result through the output terminal 4C of the arithmetic circuit 4. Specifically, the arithmetic circuit 4 subtracts the AC component signal of the specified frequency band input to the first input terminal 4A from the reference AC component signal input to the second input terminal 4B to obtain the subtraction result, which is used to indicate whether arcing exists in the line under test.
[0065] In one example, the AC component signal of a specified frequency band input at the first input terminal 4A is subtracted from the reference AC component signal input at the second input terminal 4B. The subtraction result can be one of two cases.
[0066] Case 1: If the subtraction result is 1, it indicates that the amplitude of the AC component signal in the specified frequency band is greater than the amplitude of the reference AC component signal, and therefore it is considered that there is arcing in the line under test.
[0067] Case 1: If the subtraction result is 0, it indicates that the amplitude of the AC component signal in the specified frequency band is less than the amplitude of the reference AC component signal, and therefore it is considered that there is no arcing in the line under test.
[0068] In one example, see Figure 2 The bandpass filter circuit 2 may include a first high-pass filter 21, a first low-pass filter 2, and a first signal amplifier 23. The input terminal 21A of the first high-pass filter 21 is connected to the output terminal 1B of the current sampling device 1, and the output terminal 21B of the first high-pass filter 21 is connected to the input terminal 22A of the first low-pass filter 22. The output terminal 22B of the first low-pass filter 22 is connected to the input terminal 23A of the first signal amplifier 23. The output terminal 23B of the first signal amplifier 23 is connected to the first input terminal 4A of the operational circuit 4.
[0069] In order to achieve the function of bandpass filtering, the cutoff frequency of the first high-pass filter 21 is lower than the cutoff frequency of the first low-pass filter 22.
[0070] The first high-pass filter 21 performs high-pass filtering on the input current signal, outputting a high-frequency AC component signal. This high-pass filtered AC component signal is then input to the first low-pass filter 22, which performs low-pass filtering, outputting an AC component signal with a frequency band between the cutoff frequencies of the first high-pass filter 21 and the first low-pass filter 22. This low-pass filtered AC component signal is then input to the first signal amplifier 23, which amplifies the input AC component signal and inputs the amplified AC component signal to the first input terminal 4A of the operational circuit 4. The amplification factor of the first signal amplifier 23 can be configured by relevant personnel according to actual conditions. For example, the amplification factor of the first signal amplifier 23 can be 50 times, the cutoff frequency of the first high-pass filter 21 can be 15kHz, and the cutoff frequency of the first low-pass filter 22 can be 25kHz.
[0071] In one example, see Figure 3 The bandpass filter circuit 2 may further include a second high-pass filter 24, a second low-pass filter 25, and a second signal amplifier 26. The input terminal 24A of the second high-pass filter 24 is connected to the output terminal 21B of the first high-pass filter 21, and the output terminal 24B of the second high-pass filter 24 is connected to the input terminal 25A of the second low-pass filter 25. The output terminal 25B of the second low-pass filter 25 is connected to the input terminal 26A of the second signal amplifier 26. The output terminal 26B of the second signal amplifier 26 is connected to the first input terminal 4A of the operational circuit 4.
[0072] To improve the accuracy of arc detection, an additional frequency band of AC component signal can be added to participate in the arc detection. Accordingly, the cutoff frequency of the first low-pass filter 22 can be lower than the cutoff frequency of the second high-pass filter 24, and the cutoff frequency of the second high-pass filter 24 can be lower than the cutoff frequency of the second low-pass filter 25.
[0073] The first high-pass filter 21 performs high-pass filtering on the input current signal, outputting a high-frequency AC component signal. This high-pass filtered AC component signal is then input to the first low-pass filter 22 and the second high-pass filter 24. The second high-pass filter 24 performs high-pass filtering on the input AC component signal again, and this filtered AC component signal is then input to the second low-pass filter 25. The second low-pass filter 25 performs low-pass filtering, outputting an AC component signal with a frequency band between the cutoff frequencies of the second high-pass filter 24 and the second low-pass filter 25. This low-pass filtered AC component signal is then input to the second signal amplifier 26, which amplifies the input AC component signal. The amplified AC component signal is then input to the first input terminal 4A of the operational circuit 4. The operational circuit 4 adds the AC component signals input from the first signal amplifier 23 and the second signal amplifier 26 to the first input terminal 4A, subtracts the summed signal from the reference AC component signal input to the second input terminal 4B, and outputs the subtraction result through the output terminal 4C of the operational circuit 4. The amplification factor of the second signal amplifier 26 can be configured by relevant personnel according to the actual situation. For example, the amplification factor of the second signal amplifier 26 can be 50 times, the cutoff frequency of the second high-pass filter 24 can be 35kHz, and the cutoff frequency of the second low-pass filter 25 can be 45kHz.
[0074] In one example, see Figure 4 The bandpass filter circuit 2 may further include a third high-pass filter 27, a third low-pass filter 28, and a third signal amplifier 29. The input terminal 27A of the third high-pass filter 27 is connected to the output terminal 24B of the second high-pass filter 24, and the output terminal 27B of the third high-pass filter 27 is connected to the input terminal 28A of the third low-pass filter 28. The output terminal 28B of the third low-pass filter 28 is connected to the input terminal 29A of the third signal amplifier 29. The output terminal 29B of the third signal amplifier 29 is connected to the first input terminal 4A of the operational circuit 4.
[0075] To further improve the accuracy of arc detection, an additional frequency band of AC component signal can be added to participate in arc detection. The cutoff frequency of the second low-pass filter 25 is lower than that of the third high-pass filter 27, and the cutoff frequency of the third high-pass filter 27 is lower than that of the third low-pass filter 28.
[0076] The first high-pass filter 21 performs high-pass filtering on the input current signal, outputting a high-frequency AC component signal. This high-pass filtered AC component signal is then input to the first low-pass filter 22, the second high-pass filter 24, and the third high-pass filter 27, respectively. The third high-pass filter 27 performs high-pass filtering on the input AC component signal again, and this high-pass filtered AC component signal is input to the second low-pass filter 25. The third low-pass filter 28 performs low-pass filtering, outputting an AC component signal with a frequency band between the cutoff frequencies of the third high-pass filter 27 and the third low-pass filter 28. This low-pass filtered AC component signal is then input to the third signal amplifier 29, which amplifies the input AC component signal and inputs the amplified AC component signal to the first input terminal 4A of the operational circuit 4. The operational circuit 4 adds the AC component signals input from the first signal amplifier 23, the second signal amplifier 26, and the third signal amplifier 29 respectively at the first input terminal 4A, and subtracts the summed signal from the reference AC component signal input at the second input terminal 4B. The subtraction result is output through the output terminal 4C of the operational circuit 4. The amplification factor of the third signal amplifier 29 can be configured by relevant personnel according to actual conditions. For example, the amplification factor of the third signal amplifier 29 can be 100 times, the cutoff frequency of the third high-pass filter 27 can be 75kHz, and the cutoff frequency of the third low-pass filter 28 can be 85kHz.
[0077] In one example, at least one of the following three filtering combinations—the combination of the first high-pass filter 21 and the first low-pass filter 22, the combination of the second high-pass filter 24 and the second low-pass filter 25, and the combination of the third high-pass filter 27 and the third low-pass filter 28—can be replaced by a band-pass filter with the same band-pass filtering function. See [link to relevant documentation] Figure 5 , showing in Figure 3Based on this, all three filter combinations are replaced with corresponding bandpass filters. Specifically, the bandpass filter circuit 2 includes a first bandpass filter 30, a second bandpass filter 31, a third bandpass filter 32, a first signal amplifier 23, a second signal amplifier 26, and a third signal amplifier 29. The input terminal 30A of the first bandpass filter 30 is connected to the output terminal 1B of the current sampling device 1, and the output terminal 30B of the first bandpass filter 30 is connected to the input terminal 23A of the first signal amplifier 23. The input terminal 31A of the second bandpass filter 31 is connected to the output terminal 1B of the current sampling device 1, and the output terminal 31B of the second bandpass filter 31 is connected to the input terminal 26A of the second signal amplifier 26. The input terminal 32A of the third bandpass filter 32 is connected to the output terminal 1B of the current sampling device 1, and the output terminal 32B of the third bandpass filter 32 is connected to the input terminal 29A of the third signal amplifier 29. The output terminals 23B of the first signal amplifier 23, 26B of the second signal amplifier 26, and 29B of the third signal amplifier 29 are respectively connected to the first input terminal 4A of the operational circuit 4.
[0078] The passbands of the first bandpass filter 30, the second bandpass filter 31, and the third bandpass filter 32 do not overlap. The passband refers to the frequency range of signals that a bandpass filter allows to pass through. For example, the lower frequency limit of the passband of the first bandpass filter 30 is 15kHz, and the upper frequency limit is 25kHz; the lower frequency limit of the passband of the second bandpass filter 31 is 35kHz, and the upper frequency limit is 45kHz; and the lower frequency limit of the passband of the third bandpass filter 32 is 75kHz, and the upper frequency limit is 85kHz.
[0079] The current sampling device 1 samples the current of the circuit under test and outputs the sampled current signal through output terminal 1B to the first bandpass filter 30, the second bandpass filter 31, and the third bandpass filter 32, respectively. The first bandpass filter 30, the second bandpass filter 31, and the third bandpass filter 32 filter the input current signal and output AC component signals of a specified frequency band. The first bandpass filter 30 inputs the filtered AC component signal to the first signal amplifier 23, which amplifies the input AC component signal and inputs the amplified AC component signal to the first input terminal 4A of the operational circuit 4. The second bandpass filter 31 inputs the filtered AC component signal to the second signal amplifier 26, which amplifies the input AC component signal and inputs the amplified AC component signal to the first input terminal 4A of the operational circuit 4. The third bandpass filter 32 inputs the filtered AC component signal to the third signal amplifier 29, which amplifies the input AC component signal and then inputs the amplified AC component signal to the first input terminal 4A of the operational circuit 4.
[0080] In one example, see Figure 6 The arc detection system also includes a fourth low-pass filter 33, a signal scaling device 34, and a processor 35. The input terminal 33A of the fourth low-pass filter 33 is connected to the output terminal 1B of the current sampling device 1, the output terminal 33B of the fourth low-pass filter 33 is connected to the input terminal 34A of the signal scaling device 34, and the output terminal 34B of the signal scaling device 34 is connected to the processor 35. The output terminal 4C of the arithmetic circuit 4 is connected to the processor 35.
[0081] To avoid misinterpreting DC switch operation as arcing, a DC component acquisition circuit can be configured in the arcing detection system. Current sampling device 1 samples the current of the circuit under test, and the sampled current signal is input to bandpass filter circuit 2 and fourth low-pass filter 33. Fourth low-pass filter 33 performs low-pass filtering on the input current signal, removing high-frequency AC components and outputting the DC component signal. The fourth low-pass filter 33 inputs the low-pass filtered DC component signal to signal scaling device 34. Signal scaling device 34 reduces or amplifies the input DC component signal before inputting it to processor 35 for processing. In addition, the subtraction result output by arithmetic circuit 4 is also input to processor 35. Processor 35 uses the DC component signal input from signal scaling device 34 and the subtraction result to determine whether arcing exists in the circuit under test and performs a re-inspection.
[0082] Here, the signal scaling device 34 amplifies or reduces the DC component signal to meet the processor's processing requirements. Specifically, if the amplitude of the DC component signal output by the low-pass filter is greater than the signal amplitude that the processor can process, then the signal scaling device 34 is a signal reduction device; if the amplitude of the DC component signal output by the low-pass filter is less than the signal amplitude that the processor can process, then the signal scaling device 34 is a signal amplification device. The cutoff frequency of the fourth low-pass filter 33 is less than the lower frequency limit of the passband of the band-pass filter circuit 2. For example, the cutoff frequency of the fourth low-pass filter 33 is 10kHz.
[0083] Processor 35 may include one or more processing cores, such as a quad-core processor, an octa-core processor, etc. Processor 35 may be implemented using at least one hardware form selected from DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), and PLA (Programmable Logic Array). Processor 35 may also include a main processor and a coprocessor. The main processor, also known as a CPU (Central Processing Unit), is used to process data in the wake-up state; the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, processor 35 may integrate a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content required to be displayed on the screen. In some examples, processor 35 may also include an AI (Artificial Intelligence) processor, which is used to handle computational operations related to machine learning.
[0084] The following explains the process of re-checking whether arcing exists in the circuit under test by processor 35:
[0085] Method 1:
[0086] The processor 35 can be configured with an arc detection period. If all subtraction results input during the arc detection period are 0, it indicates that there is no arcing in the circuit under test, and no re-inspection is required. If there is a 1 in the subtraction results input during the arc detection period, it is determined that there may be arcing in the circuit during that arc detection period. Then, it can be determined whether the DC component signal input during the arc detection period meets the DC switch on-condition or DC switch off-condition. If the DC component signal received during the arc detection period meets the DC switch on-condition, it is determined that there is DC switch on operation in the circuit under test, and there is no arcing; if the DC component signal received during the arc detection period meets the DC switch off-condition, it is determined that there is DC switch off operation in the circuit under test, and there is no arcing; if the DC component signal received during the arc detection period does not meet either the DC switch on-condition or the DC switch off-condition, it is determined that there is arcing in the circuit under test, and there is no DC switch operation. The DC switch on-condition can be that the DC component signal received during the arc detection period changes from no signal to signal. The above-mentioned DC switch turn-off condition can be that the DC component signal received during the arc detection period changes from having a signal to having no signal.
[0087] Method 2:
[0088] A neural network model can be used for re-inspection. Specifically, the processor 35 can be configured with an arc detection cycle. If all subtraction results input within the arc detection cycle are 0, it indicates that the line under test does not have an arc, and no re-inspection is needed. If there is a 1 among the subtraction results input within the arc detection cycle, it is determined that the line may have an arc during that arc detection cycle. In this case, the processor 35 can call a pre-trained arc detection model, which is a neural network model. The DC component signal input within the arc detection cycle is input into the arc detection model, and the arc detection model outputs an inference result. If the inference result is 1, it indicates that the line has an arc; if the inference result is 0, it indicates that the line does not have an arc. Alternatively, the arc detection model outputs an arc confidence score. If the arc confidence score is greater than a threshold, it is determined that the line has an arc; if the arc confidence score is not greater than the threshold, it is determined that the line does not have an arc. The threshold can be configured by relevant personnel according to actual needs; for example, the threshold can be 95%.
[0089] In one example, the above-mentioned operational circuit 4 can be an addition and subtraction circuit.
[0090] In the technical solution provided in this application, a current signal in the circuit under test is acquired by a current sampling device. Then, the current signal is filtered by a bandpass filter circuit to obtain an AC component signal of a specified frequency band. Because the AC component signal of the specified frequency band has obvious characteristics when arcing occurs, the acquired AC component signal can be subtracted from a reference AC component signal by a calculation circuit. The subtraction result can then indicate whether arcing exists in the circuit under test.
[0091] In the description of the embodiments in this application, the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the embodiments or examples, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0092] It is understood that in this application, "multiple" refers to two or more, and other quantifiers are similar. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The singular forms "a," "the," and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.
[0093] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this application, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.
[0094] It is further understood that the terms “center,” “longitudinal,” “lateral,” “front,” “rear,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation.
[0095] It is further understood that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between the two components; they can refer to a direct connection between two components without the presence of other components, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0096] It is further understood that although the operations are described in a specific order in the accompanying drawings in the embodiments of this application, this should not be construed as requiring these operations to be performed in the specific order or serial order shown, or requiring all the operations shown to obtain the desired result. In certain environments, multitasking and parallel processing may be advantageous.
[0097] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the solutions disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this application are indicated by the scope of claims.
[0098] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.
[0099] It should be noted that all information (including but not limited to user equipment information, user personal information, etc.), data (including but not limited to data used for analysis, stored data, displayed data, etc.), and signals (including but not limited to signals transmitted between the user terminal and other devices) involved in this application have been authorized by the user or fully authorized by all parties, and the collection, use, and processing of related data must comply with the relevant laws, regulations, and standards of the relevant countries and regions. For example, the current signals, DC component signals, and AC component signals involved in this application were all obtained with full authorization.
[0100] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. An arc draw detection system, characterized by, The arc detection system comprises a current sampling device (1), a band-pass filter circuit (2), a signal generating circuit (3) and an operation circuit (4), wherein: The sampling end (1A) of the current sampling device (1) is connected with the line to be detected, and the output end (1B) of the current sampling device (1) is connected with the input end of the band-pass filter circuit (2); The output end of the band-pass filter circuit (2) is connected with the first input end (4A) of the operation circuit (4); The output end of the signal generating circuit (3) is connected with the second input end (4B) of the operation circuit (4), and the signal generating circuit (3) is used for outputting a reference AC component signal; The operation circuit (4) is used for subtracting the reference AC component signal input through the second input end (4B) from the AC component signal input through the first input end (4A), and outputting the subtraction result through the output end (4C) of the operation circuit (4), wherein the subtraction result is used for indicating whether the line to be detected has an arc.
2. The arc draw detection system of claim 1, wherein, The band-pass filter circuit (2) comprises a first high-pass filter (21), a first low-pass filter (22) and a first signal amplifier (23), wherein: The input end (21A) and the output end (21B) of the first high-pass filter (21) are connected with the output end (1B) and the input end (22A) of the first low-pass filter (22), respectively; The output end (22B) of the first low-pass filter (22) is connected with the input end (23A) of the first signal amplifier (23); The output end (23B) of the first signal amplifier (23) is connected with the first input end (4A).
3. The arc draw detection system of claim 2, wherein, The band-pass filter circuit (2) further comprises a second high-pass filter (24), a second low-pass filter (25) and a second signal amplifier (26), wherein: The input end (24A) and the output end (24B) of the second high-pass filter (24) are connected with the output end (21B) and the input end (25A) of the second low-pass filter (25), respectively; The output end (25B) of the second low-pass filter (25) is connected with the input end (26A) of the second signal amplifier (26); The output end (26B) of the second signal amplifier (26) is connected with the first input end (4A).
4. The arc draw detection system of claim 3, wherein, The first cutoff frequency of the first low-pass filter (22) is less than the second cutoff frequency of the second high-pass filter (24), and the second cutoff frequency is less than the third cutoff frequency of the second low-pass filter (25).
5. The arc draw detection system of claim 4, wherein, The band-pass filter circuit (2) further comprises a third high-pass filter (27), a third low-pass filter (28) and a third signal amplifier (29), wherein: The input end (27A) and the output end (27B) of the third high-pass filter (27) are connected with the output end (24B) and the input end (28A) of the third low-pass filter (28), respectively; The output end (28B) of the third low-pass filter (28) is connected with the input end (29A) of the third signal amplifier (29); An output terminal (29B) of the third signal amplifier (29) is connected with the first input terminal (4A).
6. The arc draw detection system of claim 5, wherein, The third cutoff frequency is less than a fourth cutoff frequency of the third high-pass filter (27), and the fourth cutoff frequency is less than a fifth cutoff frequency of the third low-pass filter (28).
7. The arc draw detection system of claim 1, wherein, The band-pass filter circuit (2) comprises a first band-pass filter (30), a second band-pass filter (31), a third band-pass filter (32), a first signal amplifier (23), a second signal amplifier (26) and a third signal amplifier (29), wherein: An input terminal (30A) and an output terminal (30B) of the first band-pass filter (30) are connected with the output terminal (1B) and an input terminal (23A) of the first signal amplifier (23) respectively; An input terminal (31A) and an output terminal (31B) of the second band-pass filter (31) are connected with the output terminal (1B) and an input terminal (26A) of the second signal amplifier (26) respectively; An input terminal (32A) and an output terminal (32B) of the third band-pass filter (32) are connected with the output terminal (1B) and an input terminal (29A) of the third signal amplifier (29) respectively; An output terminal (23B) of the first signal amplifier (23), an output terminal (26B) of the second signal amplifier (26) and an output terminal (29B) of the third signal amplifier (29) are connected with the first input terminal (4A) respectively.
8. The arc draw detection system of claim 7, wherein, There is no intersection between a passband of the first band-pass filter (30), a passband of the second band-pass filter (31) and a passband of the third band-pass filter (32).
9. The arc attraction detection system of any of claims 1-8, wherein, The arc-detecting system further comprises a fourth low-pass filter (33), a signal scaling device (34) and a processor (35), wherein: An input terminal (33A) and an output terminal (33B) of the fourth low-pass filter (33) are connected with the output terminal (1B) and an input terminal (34A) of the signal scaling device (34) respectively; An output terminal (34B) of the signal scaling device (34) is connected with the processor (35); The output terminal (4C) is connected with the processor (35), and the processor (35) is configured to determine whether the to-be-detected line has the arc based on a direct current component signal output by the output terminal (34B) and the subtraction result.
10. The arc draw detection system of claim 9, wherein, A cutoff frequency of the fourth low-pass filter (33) is less than a lower limit of a frequency of a passband of the band-pass filter circuit (2).