Arcing detection system

Abstract

The utility model discloses an arc discharge detection system, and belongs to the technical field of circuit detection. The system comprises a current sampling device, a band-pass filter circuit, a signal generation circuit and an operational circuit, the sampling end of the current sampling device is connected with a line to be detected, and the output end of the current sampling device is connected with the input end of the band-pass filter circuit; the output end of the band-pass filter circuit is connected with the first input end of the operational circuit; the output end of the signal generation circuit is connected with the second input end of the operational circuit, and the signal generation circuit is used for outputting a reference AC component signal; the operational circuit is used for subtracting the AC component signal input by the first input end from the reference AC component signal input by the second input end, a subtraction result is output through the output end of the operational circuit, and the subtraction result is used for indicating whether arc discharge exists in the line to be detected or not. And arc discharge detection of the circuit can be realized.

Description

Technical Field

[0001] This application relates to the field of circuit detection technology, and particularly to an arc detection system. Background Art

[0002] With the development of photovoltaic technology, currently, a large number of photovoltaic power stations are installed in places such as residential areas and industrial parks. The photovoltaic power generation system of a photovoltaic power station has a high voltage and many circuit connection points. If a connection point has poor contact, an arc will occur. Since the photovoltaic power generation system is direct current without a zero crossing, once an arc is formed, it is very difficult to extinguish itself, which may ignite electrical equipment and cause a fire.

[0003] Therefore, there is an urgent need for a system that can detect arcs in a circuit to detect arcs early and cut off the faulty circuit in time. Utility Model Content

[0004] The embodiments of this application provide an arc detection system that can detect arcs in a line. The technical solution is as follows:

[0005] An arc detection system is provided. The arc detection system includes a current sampling device, a band-pass filter circuit, a signal generation circuit, and an arithmetic circuit, where:

[0006] The sampling end of the current sampling device is connected to the line to be detected, and the output end of the current sampling device is connected to the input end of the band-pass filter circuit;

[0007] The output end of the band-pass filter circuit is connected to the first input end of the arithmetic circuit;

[0008] The output end of the signal generation circuit is connected to the second input end 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 from the first input end from the reference AC component signal input from the second input end, and output the subtraction result through the output end of the arithmetic circuit. The subtraction result is used to indicate whether there is an arc in the line to be detected.

[0010] In a possible implementation, the band-pass filter circuit includes a first high-pass filter, a first low-pass filter, and a first signal amplifier, where:

[0011] The input end of the first high-pass filter is connected to the output end of the current sampling device, and the output end of the first high-pass filter is connected to the input end of the first low-pass filter;

[0012] The output end of the first low-pass filter is connected to the input end of the first signal amplifier;

[0013] The output terminal of the first signal amplifier is connected to the first input terminal of the arithmetic circuit.

[0014] In a possible implementation, the cut-off frequency of the first high-pass filter is less than the cut-off frequency of the first low-pass filter.

[0015] In a possible implementation, the band-pass filter circuit further includes a second high-pass filter, a second low-pass filter, and a second signal amplifier, where:

[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 terminal of the second high-pass filter is connected to the input terminal of the second low-pass filter;

[0018] The output terminal of the second low-pass filter is connected to the input terminal of the second signal amplifier;

[0019] The output terminal of the second signal amplifier is connected to the first input terminal of the arithmetic circuit, and the arithmetic circuit is configured to add the AC component signals input at the first input terminal, and subtract the added signal from the reference AC component signal input at the second input terminal, and output the subtraction result through the output terminal of the arithmetic circuit.

[0020] In a possible implementation, the cut-off frequency of the first low-pass filter is less than the cut-off frequency of the second high-pass filter, and the cut-off frequency of the second high-pass filter is less than the cut-off frequency of the second low-pass filter.

[0021] In a possible implementation, the band-pass filter circuit further includes a third high-pass filter, a third low-pass filter, and a third signal amplifier, where:

[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 terminal of the third high-pass filter is connected to the input terminal 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 arithmetic circuit.

[0026] In a possible implementation, the cut-off frequency of the second low-pass filter is less than the cut-off frequency of the third high-pass filter, and the cut-off frequency of the third high-pass filter is less than the cut-off frequency of the third low-pass filter.

[0027] In a possible implementation, the band-pass filter circuit includes a first band-pass filter, a second band-pass filter, a third band-pass filter, a first signal amplifier, a second signal amplifier, and a third signal amplifier, where:

[0028] The input end of the first band-pass filter is connected to the output end of the current sampling device, and the output end of the first band-pass filter is connected to the input end of the first signal amplifier;

[0029] The input end of the second band-pass filter is connected to the output end of the current sampling device, and the output end of the second band-pass filter is connected to the input end of the second signal amplifier;

[0030] The input end of the third band-pass filter is connected to the output end of the current sampling device, and the output end of the third band-pass filter is connected to the input end of the third signal amplifier;

[0031] The output ends of the first signal amplifier, the second signal amplifier, and the third signal amplifier are respectively connected to the first input end of the arithmetic circuit.

[0032] In a possible implementation, there is no intersection between the passbands of the first band-pass filter, the second band-pass filter, and the third band-pass filter.

[0033] In a possible implementation, the arc detection system further includes a fourth low-pass filter, a signal scaling device, and a processor, where:

[0034] The input end of the fourth low-pass filter is connected to the output end of the current sampling device, and the output end of the fourth low-pass filter is connected to the input end of the signal scaling device (34);

[0035] The output end of the signal scaling device is connected to the processor;

[0036] The output end of the arithmetic circuit is connected to the processor, and the processor is configured to determine whether there is an arc in the line to be detected based on the DC component signal output from the output end and the subtraction result.

[0037] In a possible implementation, the cut-off 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 brought by the technical solution provided by this application are:

[0039] In the technical solution provided by this application, a current sampling device is used to collect the current signal in the line to be detected. Then, a band-pass filter circuit is used to filter the current signal to obtain an AC component signal in a specified frequency band. Since there is an obvious characteristic in the AC component signal in the specified frequency band when arcing occurs, the collected AC component signal can be subtracted from the reference AC component signal through an arithmetic circuit, and the subtraction result can indicate whether there is arcing in the line to be detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0041] Figure 1 is a schematic structural diagram of an arcing detection system provided by an embodiment of this application;

[0042] Figure 2 is a schematic structural diagram of an arcing detection system provided by an embodiment of this application;

[0043] Figure 3 is a schematic structural diagram of an arcing detection system provided by an embodiment of this application;

[0044] Figure 4 is a schematic structural diagram of an arcing detection system provided by an embodiment of this application;

[0045] Figure 5 is a schematic structural diagram of an arcing detection system provided by an embodiment of this application;

[0046] Figure 6 is a schematic structural diagram of an arcing detection system provided by an embodiment of this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0047] To facilitate the understanding of the embodiments of this application, the following first explains some terms related to the embodiments of this application.

[0048] I. Arcing

[0049] Arcing is a phenomenon that generates high temperature and high energy through arc discharge. Its principle is to apply a sufficient voltage between two electrodes, so that electrons accelerate under the action of the electric field. When the electron speed is fast enough, they will collide with atoms or molecules, causing them to lose electrons and form ions. These ions continue to accelerate under the action of the electric field and finally form an arc.

[0050] II. Hall current sensor

[0051] The Hall current sensor is based on the magnetic balance Hall principle. According to the Hall effect principle, 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. Then, a potential difference, called the Hall potential difference, will be generated in the direction perpendicular to the current and the magnetic field, and its magnitude is proportional to the control current.

[0052] In the embodiment of the present application, the Hall current sensor can be installed on the cable of the circuit to be detected to sample the current signal in the circuit.

[0053] III. Low-pass filter

[0054] A low-pass filter is an electronic filtering device that allows signals below the cut-off frequency to pass through, but does not allow signals above the cut-off frequency to pass through.

[0055] IV. High-pass filter

[0056] A high-pass filter is an electronic filtering device that allows signals above the cut-off frequency to pass through, but does not allow signals below the cut-off frequency to pass through.

[0057] V. Band-pass filter

[0058] A band-pass filter is an electronic filtering device that allows signals within a specified frequency range to pass through, but does not allow signals outside the specified frequency range to pass through. Among them, the frequency range within which the band-pass filter allows signals to pass through is called the passband.

[0059] The arc-detection system provided by the embodiment of the present application will be described below with reference to the accompanying drawings.

[0060] The arc-detection system provided by the embodiment of the present application can detect DC arcs and can be applied to various power generation systems such as photovoltaic power generation systems, wind power generation systems, and hydroelectric power generation systems. In the power supply circuit of the power generation system, the voltage is high and there are many circuit connection points. If there is poor contact at a certain connection point, an arc will occur. Since there is direct current being transmitted and direct current has no zero-crossing point, once the arc is formed, it is very difficult to extinguish itself, which may ignite electrical equipment and cause a fire.

[0061] The technical solution provided by the embodiment of the present application is to collect the current signal in the circuit to be detected through a current sampling device, and then filter the current signal through a band-pass filter circuit to obtain the AC component signal in the specified frequency band. Further, the collected AC component signal is subtracted from the reference AC component signal through an arithmetic circuit, and the subtraction result can indicate whether there is an arc in the circuit to be detected.

[0062] See Figure 1 , which shows the structural schematic diagram of an arc-detection system provided by the embodiment of the present application. As Figure 1As shown in the figure, the arc striking detection system includes a current sampling device 1, a band-pass filter circuit 2, a signal generation circuit 3, and an arithmetic circuit 4. The sampling terminal 1A of the current sampling device 1 is connected to the line to be detected, and the output terminal 1B of the current sampling device 1 is connected to the input terminal of the band-pass filter circuit 2. The output terminal of the band-pass filter circuit 2 is connected to the first input terminal 4A of the arithmetic circuit 4. The output terminal of the signal generation circuit 3 is connected to the second input terminal 4B of the arithmetic circuit 4. The signal generation circuit 3 is used to output a reference AC component signal, which can be collected by relevant personnel when there is no arc striking in the line to be detected and is analog output through the signal generation circuit 3.

[0063] Among them, 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 line to be detected to sample the current of the line to be detected, and the sampled current signal is output to the input terminal of the band-pass filter circuit 2 through the output terminal 1B. The band-pass filter circuit 2 filters the input current signal. Because when there is an arc striking in the line, the AC component signal in a specified frequency band in the current signal has obvious characteristics, the band-pass filter circuit 2 can be configured to filter the current signal and output the AC component signal in the specified frequency band. The AC component signal in the specified frequency band output from the output terminal of the band-pass filter circuit 2 is input to the first input terminal 4A of the arithmetic circuit 4. In addition, 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 signals input to the first input terminal 4A, subtract the signals input to the second input terminal 4B from the signals 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 reference AC component signal input to the second input terminal 4B from the AC component signal in the specified frequency band input to the first input terminal 4A to obtain a subtraction result, and the subtraction result is used to indicate whether there is an arc striking in the line to be detected.

[0065] In one example, subtracting the reference AC component signal input to the second input terminal 4B from the AC component signal in the specified frequency band input to the first input terminal 4A may result in two cases for the obtained subtraction result.

[0066] Case 1: The subtraction result is 1, indicating that the amplitude of the AC component signal in the specified frequency band is greater than the amplitude of the reference AC component signal, then it is considered that there is an arc striking in the line to be detected.

[0067] Case 2: The subtraction result is 0, indicating that the amplitude of the AC component signal in the specified frequency band is less than the amplitude of the reference AC component signal, then it is considered that there is no arc striking in the line to be detected.

[0068] In one example, refer toFigure 2 , the band-pass filter circuit 2 may include a first high-pass filter 21, a first low-pass filter 22, 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 arithmetic circuit 4.

[0069] Among them, in order to achieve the function of band-pass filtering, the cut-off frequency of the first high-pass filter 21 is less than the cut-off frequency of the first low-pass filter 22.

[0070] The first high-pass filter 21 performs high-pass filtering on the input current signal, outputs a high-frequency AC component signal, inputs the AC component signal after high-pass filtering to the first low-pass filter 22, the first low-pass filter 22 performs low-pass filtering, outputs an AC component signal with a frequency band between the cut-off frequency of the first high-pass filter 21 and the cut-off frequency of the first low-pass filter 22, and inputs the AC component signal after low-pass filtering to the first signal amplifier 23. The first signal amplifier 23 amplifies the input AC component signal, and inputs the AC component signal after signal amplification processing to the first input terminal 4A of the arithmetic circuit 4. Among them, the amplification factor of the first signal amplifier 23 can be configured by relevant personnel according to the actual situation. Exemplarily, the amplification factor of the first signal amplifier 23 can be 50 times, the cut-off frequency of the first high-pass filter 21 can be 15 kHz, and the cut-off frequency of the first low-pass filter 22 can be 25 kHz.

[0071] In one example, see Figure 3 , the band-pass 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 arithmetic circuit 4.

[0072] Among them, in order to improve the accuracy of arc strike detection, an AC component signal of another frequency band can be added to participate in the arc strike detection. Correspondingly, the cut-off frequency of the first low-pass filter 22 can be less than the cut-off frequency of the second high-pass filter 24, and the cut-off frequency of the second high-pass filter 24 can be less than the cut-off frequency of the second low-pass filter 25.

[0073] The first high-pass filter 21 performs high-pass filtering on the input current signal and outputs a high-frequency AC component signal. The AC component signal after high-pass filtering is respectively 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 inputs the AC component signal after high-pass filtering to the second low-pass filter 25. The second low-pass filter 25 performs low-pass filtering and outputs an AC component signal with a frequency band between the cut-off frequency of the second high-pass filter 24 and the cut-off frequency of the second low-pass filter 25, and inputs the AC component signal after low-pass filtering to the second signal amplifier 26. The second signal amplifier 26 amplifies the input AC component signal, and inputs the AC component signal after signal amplification processing to the first input terminal 4A of the arithmetic circuit 4. The arithmetic circuit 4 adds the AC component signals respectively input from the first signal amplifier 23 and the second signal amplifier 26 at the first input terminal 4A, subtracts the added signal from the reference AC component signal input at the second input terminal 4B, and outputs the subtraction result through the output terminal 4C of the arithmetic circuit 4. Among them, the amplification factor of the second signal amplifier 26 can be configured by relevant personnel according to the actual situation. Exemplarily, the amplification factor of the second signal amplifier 26 can be 50 times, the cut-off frequency of the second high-pass filter 24 can be 35 kHz, and the cut-off frequency of the second low-pass filter 25 can be 45 kHz.

[0074] In one example, referring to Figure 4 , the band-pass 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 arithmetic circuit 4.

[0075] Among them, in order to further improve the accuracy of arc strike detection, an AC component signal of another frequency band can be added to participate in the arc strike detection. Correspondingly, the cut-off frequency of the second low-pass filter 25 is less than the cut-off frequency of the third high-pass filter 27, and the cut-off frequency of the third high-pass filter 27 is less than the cut-off frequency of the third low-pass filter 28.

[0076] The first high-pass filter 21 performs high-pass filtering on the input current signal and outputs a high-frequency AC component signal. The AC component signal after high-pass filtering is respectively input to the first low-pass filter 22, the second high-pass filter 24, and the third high-pass filter 27. The third high-pass filter 27 performs high-pass filtering on the input AC component signal again and inputs the AC component signal after high-pass filtering to the second low-pass filter 25. The third low-pass filter 28 performs low-pass filtering and outputs an AC component signal with a frequency band between the cut-off frequency of the third high-pass filter 27 and the cut-off frequency of the third low-pass filter 28, and inputs the AC component signal after low-pass filtering to the third signal amplifier 29. The third signal amplifier 29 amplifies the input AC component signal and inputs the AC component signal after signal amplification processing to the first input terminal 4A of the arithmetic circuit 4. The arithmetic circuit 4 adds the AC component signals respectively input from the first signal amplifier 23, the second signal amplifier 26, and the third signal amplifier 29 at the first input terminal 4A, subtracts the added signal from the reference AC component signal input at the second input terminal 4B, and outputs the subtraction result through the output terminal 4C of the arithmetic circuit 4. Among them, the amplification factor of the third signal amplifier 29 can be configured by relevant personnel according to the actual situation. Exemplarily, the amplification factor of the third signal amplifier 29 can be 100 times, the cut-off frequency of the third high-pass filter 27 can be 75 kHz, and the cut-off frequency of the third low-pass filter 28 can be 85 kHz.

[0077] In one example, for at least one of the three filtering combinations, namely, the filtering combination of the first high-pass filter 21 and the first low-pass filter 22, the filtering combination of the second high-pass filter 24 and the second low-pass filter 25, and the filtering combination of the third high-pass filter 27 and the third low-pass filter 28, a band-pass filter with the same band-pass filtering function can be used for replacement. Refer to Figure 5 , which shows in Figure 3On the basis of [description], all three filtering combinations are replaced with corresponding band - pass filters. Specifically, the band - pass filtering circuit 2 includes 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. The input terminal 30A of the first band - pass filter 30 is connected to the output terminal 1B of the current sampling device 1, and the output terminal 30B of the first band - pass filter 30 is connected to the input terminal 23A of the first signal amplifier 23. The input terminal 31A of the second band - pass filter 31 is connected to the output terminal 1B of the current sampling device 1, and the output terminal 31B of the second band - pass filter 31 is connected to the input terminal 26A of the second signal amplifier 26. The input terminal 32A of the third band - pass filter 32 is connected to the output terminal 1B of the current sampling device 1, and the output terminal 32B of the third band - pass filter 32 is connected to the input terminal 29A of the third signal amplifier 29. The output terminal 23B of the first signal amplifier 23, the output terminal 26B of the second signal amplifier 26, and the output terminal 29B of the third signal amplifier 29 are respectively connected to the first input terminal 4A of the arithmetic circuit 4.

[0078] Among them, there is no intersection between the passbands of the first band - pass filter 30, the second band - pass filter 31, and the third band - pass filter 32. The passband refers to the frequency range of the signal allowed to pass through by the band - pass filter. Exemplarily, the lower frequency limit of the passband of the first band - pass filter 30 is 15 kHz, and the upper frequency limit is 25 kHz. The lower frequency limit of the passband of the second band - pass filter 31 is 35 kHz, and the upper frequency limit is 45 kHz. The lower frequency limit of the passband of the third band - pass filter 32 is 75 kHz, and the upper frequency limit is 85 kHz.

[0079] The current sampling device 1 samples the current of the circuit to be detected, and outputs the sampled current signals to the first band-pass filter 30, the second band-pass filter 31, and the third band-pass filter 32 respectively through the output terminal 1B. The first band-pass filter 30, the second band-pass filter 31, and the third band-pass filter 32 filter the input current signals respectively, and output the AC component signals of the specified frequency band. The first band-pass filter 30 inputs the filtered AC component signal to the first signal amplifier 23. The first signal amplifier 23 amplifies the input AC component signal, and inputs the amplified AC component signal to the first input terminal 4A of the arithmetic circuit 4. The second band-pass filter 31 inputs the filtered AC component signal to the second signal amplifier 26. The second signal amplifier 26 amplifies the input AC component signal, and inputs the amplified AC component signal to the first input terminal 4A of the arithmetic circuit 4. The third band-pass filter 32 inputs the filtered AC component signal to the third signal amplifier 29. The third signal amplifier 29 amplifies the input AC component signal, and inputs the amplified AC component signal to the first input terminal 4A of the arithmetic circuit 4.

[0080] In one example, referring to Figure 6 , the arc striking detection system further 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. 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] Among them, in order to avoid misjudging the DC switch operation as arc striking, a DC component acquisition circuit can be configured in the arc striking detection system. The current sampling device 1 samples the current of the circuit to be detected, and inputs the sampled current signals to the band-pass filter circuit 2 and the fourth low-pass filter 33 respectively. The fourth low-pass filter 33 performs low-pass filtering on the input current signal, filters out the high-frequency AC components in the current signal, and outputs the DC component signal of the current signal. The fourth low-pass filter 33 inputs the DC component signal obtained after low-pass filtering to the signal scaling device 34. The signal scaling device 34 reduces or amplifies the input DC component signal, and then inputs it to the processor 35 for processing. In addition, the subtraction result output by the arithmetic circuit 4 is also input to the processor 35. The processor 35 is used to determine whether there is an arc strike on the circuit to be detected for re-inspection based on the DC component signal input by the signal scaling device 34 and the subtraction result.

[0082] Here, the function of the signal scaling device 34 is to amplify or reduce the DC component signal to meet the processing requirements of the processor. Specifically, if the amplitude of the DC component signal filtered by the low-pass filter is greater than the signal amplitude that the processor can process, the signal scaling device 34 is a signal reduction device; if the amplitude of the DC component signal filtered by the low-pass filter is less than the signal amplitude that the processor can process, the signal scaling device 34 is a signal amplification device. Among them, the cut-off 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. Exemplarily, the cut-off frequency of the fourth low-pass filter 33 is 10 kHz.

[0083] The processor 35 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 35 may be implemented in at least one of the following hardware forms: DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), and PLA (Programmable Logic Array). The processor &01 may also include a main processor and a coprocessor. The main processor is a processor used to process data in the wake state, also known as the CPU (Central Processing Unit); the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, the processor 35 may be integrated with a GPU (Graphics Processing Unit), and the GPU is responsible for rendering and drawing the content to be displayed on the display screen. In some examples, the processor 35 may further include an AI (Artificial Intelligence) processor, and the AI processor is used to process computational operations related to machine learning.

[0084] The following describes the process of the processor 35 rechecking whether there is arcing in the line to be detected:

[0085] Method 1:

[0086] The processor 35 can be configured with an arcing detection period. If the subtraction results input within the arcing detection period are all 0, it indicates that there is no arcing in the circuit to be detected and no recheck is required. If there is a 1 in the subtraction results input within the arcing detection period, it is determined that there may be arcing in the circuit during this arcing detection period. Then, it can be judged whether the DC component signal input within this arcing detection period meets the DC switch-on condition or the DC switch-off condition. If the DC component signal received within this arcing detection period meets the DC switch-on condition, it is determined that there is a DC switch-on operation in the circuit to be detected and there is no arcing. If the DC component signal received within this arcing detection period meets the DC switch-off condition, it is determined that there is a DC switch-off operation in the circuit to be detected and there is no arcing. If the DC component signal received within this arcing detection period does not meet the above DC switch-on condition and does not meet the above DC switch-off condition, it is determined that there is arcing in the circuit to be detected and there is no DC switch operation. The above DC switch-on condition can be that the DC component signal received within the arcing detection period changes from no signal to a signal. The above DC switch-off condition can be that the DC component signal received within the arcing detection period changes from a signal to no signal.

[0087] Method 2:

[0088] A neural network model can be used for recheck. Specifically, the processor 35 can be configured with an arcing detection period. If the subtraction results input within the arcing detection period are all 0, it indicates that there is no arcing in the circuit to be detected and no recheck is required. If there is a 1 in the subtraction results input within the arcing detection period, it is determined that there may be arcing in the circuit during this arcing detection period. Then, the processor 35 can call a pre-trained arcing detection model, and this arcing detection model is a neural network model. The DC component signal input within this arcing detection period is input into the arcing detection model, and the arcing detection model outputs an inference result. If the inference result is 1, it indicates that there is arcing in the circuit. If the inference result is 0, it indicates that there is no arcing in the circuit. Or, the arcing detection model outputs an arcing confidence level. If the arcing confidence level is greater than the threshold, it is determined that there is arcing in the circuit. If the arcing confidence level is not greater than the threshold, it is determined that there is no arcing in the circuit. Among them, the threshold can be configured by relevant personnel according to actual needs. Exemplarily, the threshold can be 95%.

[0089] In one example, the above operation circuit 4 can be an addition and subtraction operation circuit.

[0090] In the technical solution provided by this application, a current sampling device is used to collect the current signal in the circuit to be detected. Then, a band-pass filter circuit is used to filter the current signal to obtain an AC component signal in a specified frequency band. Since there are obvious characteristics in the AC component signal in the specified frequency band when arcing occurs, the collected AC component signal can be subtracted from the reference AC component signal through an arithmetic circuit, and the subtraction result can indicate whether there is arcing in the circuit to be detected.

[0091] In the description of the embodiments of the application, the descriptions with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of this application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0092] It can be understood that "a plurality of" in this application means two or more, and other quantifiers are similar. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after. The singular forms of "a", "the", and "said" are also intended to include the plural forms unless the context clearly indicates otherwise.

[0093] Furthermore, it can be understood that the terms "first", "second", etc. are used to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other and do not indicate a specific order or importance. In fact, the expressions such as "first" and "second" can be used interchangeably. For example, without departing from the scope of this application, the first information can also be called the second information, and similarly, the second information can also be called the first information.

[0094] It can be further understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "front", "rear", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this embodiment and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation.

[0095] It can be further understood that, unless otherwise clearly specified and limited, terms such as "mounted", "connected", "connected to", "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral molding; it can be a mechanical connection, an electrical connection, or a connection that allows mutual communication; it can be a direct connection without other components between the two, or an indirect connection through an intermediate medium, and it can be the internal communication between two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0096] It can be further understood that although the operations are described in a specific order in the drawings in the embodiments of the present application, it should not be understood as requiring these operations to be performed in the specific order shown or in a serial order, or requiring all the operations shown to obtain the desired result. In a specific environment, multitasking and parallel processing may be beneficial.

[0097] Those skilled in the art will readily think of other implementation schemes of the present application after considering the specification and practicing the solutions disclosed herein. The present application is intended to cover any variations, uses, or adaptive changes of the present application, which follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and the embodiments are only regarded as exemplary, and the true scope and spirit of the present application are pointed out by the scope of the claims.

[0098] It should be understood that the present application is not limited to the precise structures already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended scope of the claims.

[0099] It should be noted that the information involved in this application (including but not limited to user device information, user personal information, etc.), data (including but not limited to data for analysis, stored data, displayed data, etc.), and signals (including but not limited to signals transmitted between user terminals and other devices, etc.) are all authorized by the user or fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with the relevant laws, regulations, and standards of relevant countries and regions. For example, the current signals, DC component signals, AC component signals, etc. involved in this application are all obtained under full authorization.

[0100] The above are only optional embodiments of this application and are not intended to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. An arc striking detection system, characterized in that, The arc-detection system includes a current sampling device (1), a band-pass filter circuit (2), a signal generation circuit (3), and an arithmetic circuit (4), where: The sampling terminal (1A) of the current sampling device (1) is connected to the line to be detected, and the output terminal (1B) of the current sampling device (1) is connected to the input terminal of the band-pass filter circuit (2); The output terminal of the band-pass filter circuit (2) is connected to the first input terminal (4A) of the arithmetic circuit (4); 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) is used to output a reference AC component signal; The arithmetic circuit (4) is used to subtract the AC component signal input from the first input terminal (4A) from the reference AC component signal input from the second input terminal (4B), and output the subtraction result through the output terminal (4C) of the arithmetic circuit (4), and the subtraction result is used to indicate whether there is an arc in the line to be detected.

2. The arc striking detection system according to claim 1, wherein The band-pass filter circuit (2) includes a first high-pass filter (21), a first low-pass filter (22), and a first signal amplifier (23), where: The input terminal (21A) and the output terminal (21B) of the first high-pass filter (21) are respectively connected to the output terminal (1B) and 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).

3. The arc-pulling detection system according to claim 2, wherein The band-pass filter circuit (2) further includes a second high-pass filter (24), a second low-pass filter (25), and a second signal amplifier (26), where: The input terminal (24A) and the output terminal (24B) of the second high-pass filter (24) are respectively connected to the output terminal (21B) and 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).

4. The arc striking detection system according to claim 3, wherein The first cut-off frequency of the first low-pass filter (22) is less than the second cut-off frequency of the second high-pass filter (24), and the second cut-off frequency is less than the third cut-off frequency of the second low-pass filter (25).

5. The arc striking detection system according to claim 4, wherein The band-pass filter circuit (2) further includes a third high-pass filter (27), a third low-pass filter (28), and a third signal amplifier (29), where: The input terminal (27A) and the output terminal (27B) of the third high-pass filter (27) are respectively connected to the output terminal (24B) and 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).

6. The arc striking detection system according to claim 5, wherein, The third cut-off frequency is less than the fourth cut-off frequency of the third high-pass filter (27), and the fourth cut-off frequency is less than the fifth cut-off frequency of the third low-pass filter (28).

7. The arc starting detection system according to claim 1, characterized in that, The band-pass filter circuit (2) includes 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: The input terminal (30A) and the output terminal (30B) of the first band-pass filter (30) are respectively connected to the output terminal (1B) and the input terminal (23A) of the first signal amplifier (23); The input terminal (31A) and the output terminal (31B) of the second band-pass filter (31) are respectively connected to the output terminal (1B) and the input terminal (26A) of the second signal amplifier (26); The input terminal (32A) and the output terminal (32B) of the third band-pass filter (32) are respectively connected to the output terminal (1B) and the input terminal (29A) of the third signal amplifier (29); The output terminal (23B) of the first signal amplifier (23), the output terminal (26B) of the second signal amplifier (26), and the output terminal (29B) of the third signal amplifier (29) are respectively connected to the first input terminal (4A).

8. The arc striking detection system according to claim 7, wherein, There is no intersection between the passband of the first band-pass filter (30), the passband of the second band-pass filter (31), and the passband of the third band-pass filter (32).

9. The arc striking detection system according to any one of claims 1-8, characterized in that, The arcing detection system further includes a fourth low-pass filter (33), a signal scaling device (34) and a processor (35), wherein: The input terminal (33A) and the output terminal (33B) of the fourth low-pass filter (33) are respectively connected to the output terminal (1B) and the input terminal (34A) of the signal scaling device (34); The output terminal (34B) of the signal scaling device (34) is connected to the processor (35); The output terminal (4C) is connected to the processor (35), and the processor (35) is configured to determine whether there is arcing in the line to be detected based on the DC component signal output from the output terminal (34B) and the subtraction result.

10. The arc-drawing detection system according to claim 9, wherein The cut-off 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).

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