WO2021217991A1 - Procédé et appareil de compensation de signal, et support de stockage - Google Patents

Procédé et appareil de compensation de signal, et support de stockage Download PDF

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Publication number
WO2021217991A1
WO2021217991A1 PCT/CN2020/113276 CN2020113276W WO2021217991A1 WO 2021217991 A1 WO2021217991 A1 WO 2021217991A1 CN 2020113276 W CN2020113276 W CN 2020113276W WO 2021217991 A1 WO2021217991 A1 WO 2021217991A1
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WO
WIPO (PCT)
Prior art keywords
signal
line
value
amplitude
preset
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PCT/CN2020/113276
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English (en)
Chinese (zh)
Inventor
叶紫权
吕颜
陈金玲
吕新伟
郑小平
刘新润
Original Assignee
威胜集团有限公司
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Publication of WO2021217991A1 publication Critical patent/WO2021217991A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks

Definitions

  • This application relates to the field of electrical safety, and in particular to a signal compensation method, device and storage medium.
  • Arc fault is a very important cause of electrical fire. Therefore, it is necessary to detect arc fault during circuit operation.
  • the existing arc fault detection mainly adopts high-frequency current detection methods, that is, when there is a fault arc, a high-frequency signal will appear in the line current. Because the amplitude of the high-frequency signal is very low, the high-frequency signal needs to be compensated for after the input
  • the detection device performs sampling, and the detection device analyzes the sampling result to determine whether there is a fault arc.
  • the existing arc fault detection methods the problem of high-frequency signal transmission attenuation caused by line impedance is not considered. If the current line has strong suppression of high-frequency signals, the amplitude attenuation of the high-frequency signals when transmitted to the detection device is large, resulting in Below the detection threshold, it will cause false negatives. Since the transmission impedance of the line changes dynamically, setting a fixed gain to compensate for high-frequency signals also has drawbacks. A fixed gain setting too high will introduce noise interference and cause false alarms of the detection device; a fixed gain setting too low may cause detection failures. ; Therefore, the existing arc fault detection methods cannot accurately compensate high-frequency signals, resulting in inaccurate arc fault detection results.
  • the main purpose of this application is to provide a signal compensation method, device and storage medium, aiming to solve the technical problem that the existing arc fault detection methods cannot accurately compensate high-frequency signals, resulting in inaccurate arc fault detection results .
  • the present application provides a signal compensation method, which is applied to a fault arc detection device, the fault arc detection device includes a detection chip, a signal output module, and a dynamic gain module.
  • the method includes the following steps:
  • the output of the dynamic gain module is adjusted.
  • the method before the step in the case where there is no arc fault in the first line, the method further includes:
  • the current signal in the first line is acquired every preset first period, and the current difference value of the low-frequency component of the current signal in the adjacent preset period is calculated, and the current difference with the largest value is calculated. Value as the maximum value of the sudden change;
  • the step of judging whether there is a fault arc on the first line according to the maximum amplitude and the maximum abrupt change includes:
  • the method further includes:
  • the method further includes:
  • the step of sending the analog arc signal of the first amplitude to the second line through the signal output module includes:
  • the step of sending a detection signal to the signal output module includes:
  • a detection signal is sent to the signal output module.
  • the step of adjusting the output of the dynamic gain module according to the magnitude of the difference and the preset error value includes:
  • the present application also provides a signal compensation device, the signal compensation device includes: a memory, a processor, and a signal compensation program stored in the memory and running on the processor, so When the signal compensation program is executed by the processor, the steps of the signal compensation method described above are implemented.
  • the present application also provides a computer-readable storage medium having a signal compensation program stored on the computer-readable storage medium, and when the signal compensation program is executed by a processor, the above-mentioned signal compensation method is implemented. A step of.
  • This application discloses a signal compensation method, device and storage medium.
  • a signal output module sends a first amplitude analog arc signal to the second line to make the simulation
  • the arc signal flows to the first circuit through the external load; the analog arc signal is obtained again in the first circuit, and the second amplitude of the analog arc signal is obtained; finally, the expected value of the first amplitude is calculated, and the expected value and the second amplitude are calculated Difference: Adjust the output of the dynamic gain module according to the difference and the preset error value.
  • the detection chip in this application sends the analog arc signal of the first amplitude to the second circuit, and then obtains the analog arc signal of the second amplitude from the first circuit. Since the analog arc signal is attenuated during the transmission process, it passes Calculate the difference between the expected value of the first amplitude and the second amplitude, and adjust the output of the dynamic gain module according to the difference and the preset error value to achieve precise compensation for the attenuation of the high-frequency signal due to line impedance suppression , So that the detection result of the fault arc is more accurate.
  • FIG. 1 is a schematic diagram of a device structure of a hardware operating environment involved in a solution of an embodiment of the present application
  • FIG. 2 is a schematic flowchart of an embodiment of a signal compensation method according to the present application.
  • FIG. 3 is a schematic diagram of the module structure of an embodiment of the signal compensation device of the present application.
  • FIG. 4 is a schematic flowchart of another embodiment of a signal compensation method according to the present application.
  • FIG. 1 is a schematic diagram of a terminal structure of a hardware operating environment involved in a solution of an embodiment of the present application.
  • the terminal of this application is a signal compensation device, and the terminal can also be other terminal devices with storage functions.
  • the terminal may include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005.
  • the communication bus 1002 is used to implement connection and communication between these components.
  • the user interface 1003 may include a display screen (Display) and an input unit such as a keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface and a wireless interface.
  • the network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a WI-FI interface).
  • the memory 1005 may be a high-speed RAM memory, or a stable memory (non-volatile memory), such as a magnetic disk memory.
  • the memory 1005 may also be a storage device independent of the aforementioned processor 1001.
  • the terminal may also include a camera, a Wi-Fi module, etc., which will not be repeated here.
  • terminal structure shown in FIG. 1 does not constitute a limitation on the terminal, and may include more or less components than shown in the figure, or combine some components, or arrange different components.
  • the network interface 1004 is mainly used to connect to a back-end server and communicate with the back-end server;
  • the user interface 1003 mainly includes an input unit such as a keyboard.
  • the keyboard includes a wireless keyboard and a wired keyboard for connecting to a client.
  • Perform data communication with the client; and the processor 1001 can be used to call the signal compensation program stored in the memory 1005 and perform the following operations:
  • the output of the dynamic gain module is adjusted.
  • processor 1001 may call the signal compensation program stored in the memory 1005, and also perform the following operations:
  • the current signal in the first line is acquired every preset first period, and the current difference value of the low-frequency component of the current signal in the adjacent preset period is calculated, and the current difference with the largest value is calculated. Value as the maximum value of the sudden change;
  • processor 1001 may call the signal compensation program stored in the memory 1005, and also perform the following operations:
  • processor 1001 may call the signal compensation program stored in the memory 1005, and also perform the following operations:
  • processor 1001 may call the signal compensation program stored in the memory 1005, and also perform the following operations:
  • processor 1001 may call the signal compensation program stored in the memory 1005, and also perform the following operations:
  • processor 1001 may call the signal compensation program stored in the memory 1005, and also perform the following operations:
  • a detection signal is sent to the signal output module.
  • processor 1001 may call the signal compensation program stored in the memory 1005, and also perform the following operations:
  • the specific embodiments of the signal compensation device are basically the same as the following embodiments of the signal compensation method, and will not be repeated here.
  • FIG. 2 is a schematic flowchart of an embodiment of a signal compensation method according to the present application.
  • the signal compensation method provided in this embodiment includes the following steps:
  • Step S10 in the case that there is no arc fault in the first line, send the analog arc signal of the first amplitude to the second line through the signal output module, so that the analog arc signal flows to the first line through the external load ;
  • the signal compensation method provided in this embodiment can be applied to a signal compensation device, and can also be applied to other arc fault detection devices.
  • FIG. 3 is a schematic diagram of the module structure of an embodiment of the signal compensation device of this application.
  • the first line is the live line L
  • the second line is the neutral line N. It should be understood that when the first line is the neutral line, the second line is set as the live line, and the first line and the second line need to be Two different lines.
  • the detection chip In the case that there is no arc fault on the first line, the detection chip outputs a detection signal to the signal output module, and the signal output module sends an analog arc signal to the second line. , Set the current amplitude of the analog arc signal to a fixed first amplitude.
  • Step S20 Obtain the analog arc signal again in the first line, and obtain the second amplitude of the analog arc signal;
  • the analog arc signal of the second circuit flows into the first circuit via the external load, and is acquired by the detection chip again. At this time, the detection chip obtains the second amplitude of the analog arc signal acquired again. It is easy to understand that the signal attenuation occurs during the transmission of the analog arc signal. The degree of signal attenuation is related to the transmission distance and the type of load connected to the line. Therefore, the value of the second amplitude should be less than the value of the first amplitude. .
  • Step S30 Calculate the expected value of the first amplitude, and calculate the difference between the expected value and the second amplitude.
  • Step S40 Adjust the output of the dynamic gain module according to the magnitude of the difference and the preset error value.
  • the expected value of the first amplitude is calculated. It is easy to understand that after the simulated arc signal of the first amplitude is sent on the second line, it flows into the detection chip 10, There is a corresponding amplifying circuit to amplify the analog arc signal, the expected value of the first amplitude, that is, in the ideal state, the analog arc signal of the first amplitude is transmitted from the second line to the first line, the analog arc signal The amplitude of the signal amplified by a fixed gain without attenuation. The value of the expected value minus the second amplitude value is the difference value. In this embodiment, an error value is also preset, the difference value is compared with the preset error value, and the dynamic gain module 20 is adjusted according to the comparison result. Output.
  • the detection chip in this embodiment sends the analog arc signal of the first amplitude to the second circuit, and then obtains the analog arc signal of the second amplitude from the first circuit. Since the analog arc signal is attenuated during transmission, By calculating the difference between the expected value of the first amplitude and the second amplitude, and adjusting the output of the dynamic gain module according to the difference and the preset error value, the accuracy of the attenuation of the high-frequency signal caused by the suppression of the line impedance is achieved. Compensation, so that the detection result of the fault arc is more accurate.
  • step S10 when there is no arc fault in the first line, the method further includes:
  • Step S50 within a preset detection time, obtain the current signal in the first line at a preset first period every interval, and calculate the current difference between the low-frequency components of the current signal in the adjacent preset period, and set the value to the maximum
  • the current difference is regarded as the maximum value of the sudden change
  • Step S60 Obtain the maximum amplitude of the high-frequency component of the specific frequency band of the current signal within a preset detection time, and use the maximum amplitude as the maximum amplitude;
  • Step S70 judging whether there is a fault arc on the first line according to the maximum value of the amplitude and the maximum value of the sudden change.
  • the method of detecting the arc fault in this embodiment is to obtain the current signal in the first line every preset first cycle, and calculate the difference between the current signals of adjacent cycles to obtain the current difference with the largest value. .
  • the current amplitude of the high-frequency component of the specific frequency band of the current signal during the preset detection time is obtained, and the maximum current amplitude is taken as the maximum amplitude.
  • the maximum value of the sudden change and the maximum value of the amplitude that can reflect the current change in the first line are obtained in the above-mentioned manner, so as to accurately determine whether there is a fault arc according to the actual working condition of the first line.
  • the step of judging whether there is a fault arc in the first line according to the maximum value of the amplitude and the maximum value of the sudden change includes:
  • Step S71 when the maximum value of the amplitude is higher than the preset first threshold value and the maximum value of the sudden change is higher than the preset second threshold value, it is determined that there is a fault arc in the first line;
  • Step S72 When the maximum amplitude value is not higher than the preset first threshold value, and/or the sudden change maximum value is not higher than the preset second threshold value, it is determined that there is no arc fault in the first line.
  • a first threshold and a second threshold are also preset, where the first threshold is a value set corresponding to the maximum value of the amplitude, and the second threshold value is a value set corresponding to the maximum value of the sudden change. If the value of the maximum value of the amplitude is high The preset first threshold value indicates that the current amplitude is too high. If the value of the maximum value of the sudden change is higher than the preset second threshold value, it indicates that the current has a sudden change. When the maximum amplitude is higher than the preset first threshold, and the maximum value of the sudden change is higher than the second preset threshold, that is, the current amplitude is too high and the current sends a sudden change, it means that there is a fault arc in the first line. , As long as the value of the maximum amplitude is not higher than the preset first threshold, or the value of the sudden change maximum is not higher than the preset second threshold, it indicates that there is no arc fault in the first line.
  • This embodiment presets a first threshold and a second threshold, and compares the maximum amplitude and the maximum abrupt value with the first and second thresholds respectively to determine whether there is excessive circuit amplitude and current abrupt changes in the first line , So as to accurately determine whether there is a fault arc in the first line.
  • step S71 determines that there is a fault arc in the first line
  • the method further includes:
  • step S73 when there is a fault arc in the first line, an alarm information is output to the outside.
  • the signal compensation device of this embodiment is also provided with an alarm module, and the alarm module is connected to the detection chip. If there is an arc fault in the first line, the detection chip outputs an alarm signal value to the alarm module, and the alarm module can send out an alarm by sounding an alarm, so that the technician can eliminate the arc fault in the line in time.
  • the method further includes:
  • Step S80 amplify the current signal
  • Step S90 Obtain low-frequency components in the amplified current signal, and obtain high-frequency signals in a specific frequency band in the amplified current signal.
  • the signal compensation device in this embodiment further includes an amplifying module, a low-pass filtering module, and a band-pass filtering module. It is easy to understand that the amplitude of the current signal obtained from the first line is small, so it is necessary to set an amplifier module to amplify the obtained current signal. As shown in Figure 3, part of the amplified current signal flows into the low-pass filter. Module, the low-pass filter module obtains the low-frequency components in the current signal.
  • the low-frequency signal in this embodiment is generally a current signal of 50 Hz to 3.2 kHz; the other part of the amplified current signal flows into the band-pass filter module to filter out the specific frequency band High frequency current signal.
  • the frequency band of the current signal corresponding to the detection chip is divided into three frequency bands: 20kHz to 100kHz, 2MHz to 2.5MHz, and 8MHz to 10MHz.
  • the preferred frequency band is 8MHz to 10MHz, that is, only current signals with a frequency band of 8MHz to 10MHz can pass.
  • Band pass filter module is configured to filter the frequency band of the current signal corresponding to the detection chip.
  • the current signal is amplified and screened in the above manner to ensure that the amplified and screened current signal meets the requirements of the detection chip.
  • the step of sending the analog arc signal of the first amplitude to the second line through the signal output module includes:
  • Step S11 Send a detection signal to the signal output module, so that the signal output module sends an analog arc signal corresponding to the detection signal to the second line according to the detection signal.
  • the signal compensation device further includes a signal output module, and the signal output module includes a signal controller and a signal generator.
  • the detection chip sends the detection signal to the signal controller of the signal output module, and the signal controller obtains the signal frequency band corresponding to the detection chip according to the detection signal, and sends the detection signal to the signal generator, and the signal generator outputs the detection signal according to the detection signal.
  • the analog arc signal conforming to the frequency band of the detection chip.
  • the frequency band corresponding to the detection chip is 8MHz to 10MHz
  • the analog arc signal sent by the signal generator is a current signal in the frequency band of 8MHz to 10MHz.
  • the step of sending a detection signal to the signal output module includes:
  • Step S111 sending a detection signal to the signal output module every preset time interval, or;
  • Step S112 Obtain the current signal in the first line every preset second period, and calculate the current difference between the current signals of adjacent preset periods;
  • Step S113 When the current difference exceeds a preset difference, a detection signal is sent to the signal output module.
  • the detection chip can send the detection signal to the signal output module at a preset time interval each time.
  • the preset time is set to 1 second, that is, the detection chip interval is 1 second.
  • the detection chip can send a detection signal to the signal output module at any time within 1 second, so that the signal output module sends an analog arc signal.
  • the detection chip is detecting When the current zero-crossing point in the first line is reached, the control signal output module sends an analog arc signal to reduce the influence of interference signals.
  • the detection chip can preset a second cycle every interval, such as 10 milliseconds, acquire the current signal in the first circuit every 10 milliseconds, and calculate the current difference between current signals of adjacent preset cycles.
  • a preset difference value is also set.
  • the preset difference value is set to 3A.
  • the timing for the signal output module to send the analog arc signal is determined in the above-mentioned manner, so as to adjust the output of the dynamic gain module in time to achieve precise compensation for the attenuation of the high-frequency signal due to the suppression of the line impedance.
  • step of adjusting the output of the dynamic gain module according to the magnitude of the difference value and the preset error value includes:
  • Step S41 Calculate the value obtained by subtracting the second amplitude from the expected value, and when the value is greater than the preset error value, control the dynamic gain module to increase the gain.
  • the expected value can be subtracted from the second amplitude to obtain the corresponding value, and then compare the value with the preset error value. If it is greater than the expected value Set the error value, indicating that the attenuation of the analog arc signal is too high during the transmission process, then control the dynamic gain module to increase the compensation gain; when the difference between the expected value and the second amplitude is not greater than the preset error value, it indicates the analog arc signal If the signal attenuation during transmission is within the acceptable range, there is no need to increase the compensation gain of the dynamic gain module.
  • an embodiment of the present application also proposes a computer-readable storage medium having a signal compensation program stored on the computer-readable storage medium, and when the signal compensation program is executed by a processor, the operations of the signal compensation method described above are implemented.
  • the technical solution of this application essentially or the part that contributes to the existing technology can be embodied in the form of a software product, and the computer software product is stored in a storage medium (such as ROM/RAM, magnetic disk, The optical disc) includes several instructions to make a terminal device (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) execute the methods described in the various embodiments of the present application.
  • a terminal device which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Locating Faults (AREA)

Abstract

Procédé et appareil de compensation de signal, et support de stockage. Le procédé consiste : d'abord, lorsqu'il n'y a pas de défaut d'arc dans une première ligne, à envoyer un signal d'arc analogique d'une première amplitude à une seconde ligne au moyen d'un module de sortie de signal, de telle sorte que le signal d'arc analogique circule vers la première ligne par l'intermédiaire d'une charge externe (S10) ; à ré-obtenir le signal d'arc analogique dans la première ligne, et à obtenir la seconde amplitude du signal d'arc analogique (S20) ; enfin, à calculer la valeur attendue de la première amplitude, et à calculer la différence entre la valeur attendue et la seconde amplitude (S30) ; et à régler la sortie d'un module de gain dynamique en fonction des amplitudes de la différence et d'une valeur d'erreur prédéfinie (S40).
PCT/CN2020/113276 2020-04-29 2020-09-03 Procédé et appareil de compensation de signal, et support de stockage WO2021217991A1 (fr)

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CN202010360031.3 2020-04-29
CN202010360031.3A CN111398759A (zh) 2020-04-29 2020-04-29 信号补偿方法、装置和存储介质

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Publication number Priority date Publication date Assignee Title
CN111398759A (zh) * 2020-04-29 2020-07-10 威胜集团有限公司 信号补偿方法、装置和存储介质

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CN107370123A (zh) * 2016-05-13 2017-11-21 上海电科电器科技有限公司 电弧故障检测装置
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CN111025107A (zh) * 2019-12-31 2020-04-17 威胜集团有限公司 故障电弧检测电路、装置及工况检测方法
CN111398759A (zh) * 2020-04-29 2020-07-10 威胜集团有限公司 信号补偿方法、装置和存储介质

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8373570B2 (en) * 2010-10-26 2013-02-12 Cooper Technologies Company ARC fault detection method and apparatus
CN107370123A (zh) * 2016-05-13 2017-11-21 上海电科电器科技有限公司 电弧故障检测装置
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