Circuit breaker single-phase radiation electromagnetic wave signal detection method, system, medium and equipment

Abstract

The embodiment of the invention discloses a circuit breaker single-phase radiation electromagnetic wave signal detection method, system, medium and equipment, and the method comprises the steps: enabling an antenna covered with an anisotropic wave-absorbing material to directly face any phase of a to-be-detected circuit breaker, and obtaining a receiving signal; receiving signals are collected, the frequency domain component of each frame of the receiving signals is denoised, and the denoised receiving signals are obtained; selecting a starting and ending point identification threshold from the short-time energy diagram of the denoised received signal; and front and back searching is carried out on the denoised receiving signals on the starting and ending point identification thresholds, and the final position of the single-phase radiation electromagnetic wave signal is determined. According to the circuit breaker single-phase radiation electromagnetic wave signal detection method, the requirement for the sampling rate is low, processing and separation of three-phase mixed signals through an algorithm are not needed, the single-phase state of the circuit breaker can be directly judged, and the detection and maintenance efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, and in particular to a method, system, medium and equipment for detecting single-phase radiated electromagnetic wave signals of a circuit breaker. Background Art

[0002] Circuit breakers are the most numerous electrical equipment in the power grid, playing a control and protection role. Once a failure occurs, it will not only directly lead to power grid accidents, but also cause the expansion of existing accidents, bringing huge negative impacts on the national economy and social stability.

[0003] The state of the contacts in the arc extinguishing chamber directly affects the arc extinguishing ability of the circuit breaker. During the circuit breaker opening and closing process, the radiated electromagnetic wave signal emitted by the contacts in the arc extinguishing chamber can reflect the state of the arc extinguishing chamber. When the state of the circuit breaker contacts deteriorates, the electromagnetic wave signal radiated by them will be distorted, which is called the arc extinguishing chamber signal. During the circuit breaker opening and closing process, the arc extinguishing chambers corresponding to the three phases will all emit electromagnetic wave signals. The existing antenna measurement range for detecting electromagnetic wave radiation of circuit breakers is relatively wide, and the measured signal is a three-phase mixed signal, which can only be used to characterize the overall state of the three phases of the circuit breaker, and cannot determine the state of each phase. Realizing the detection of single-phase electromagnetic wave radiation signals of circuit breakers has become an urgent problem to be solved. Summary of the invention

[0004] Based on this, it is necessary to propose a method, system, medium and equipment for detecting single-phase radiation electromagnetic wave signals of circuit breaker to address the above problems.

[0005] A method for detecting a single-phase radiated electromagnetic wave signal of a circuit breaker, the method comprising:

[0006] The antenna covered with anisotropic absorbing material is pointed at any phase of the circuit breaker to be tested to obtain the receiving signal.

[0007] The received signal is collected, and the frequency domain component of each frame of the received signal is denoised to obtain the denoised received signal.

[0008] The start and end point identification thresholds are selected in the short-time energy diagram of the received signal after denoising.

[0009] The de-noised received signal is searched forward and backward respectively at the start and end point recognition thresholds to determine the final position of the single-phase radiated electromagnetic wave signal.

[0010] The collecting of the received signal, denoising the frequency domain component of each frame of the received signal, and obtaining the denoised received signal specifically includes:

[0011] After the received signal is subjected to windowing and framing processing, a discrete Fourier transform is performed on each frame of the received signal subjected to the windowing and framing processing to determine a frequency domain component of each frame of the received signal.

[0012] The average energy of the received signal after the windowing and framing process is calculated to obtain the noise average energy.

[0013] The frequency domain component of the received signal of each frame is subtracted from the noise average energy to obtain the received signal amplitude.

[0014] The received signal amplitude is combined with the phase angle of the frequency component, and the received signal after denoising is obtained by using inverse fast Fourier transform.

[0015] Among them, after the received signal is subjected to windowing and framing processing, a discrete Fourier transform is performed on each frame of the received signal after the windowing and framing processing to determine the frequency domain component of each frame of the received signal, which specifically includes:

[0016] After windowing and framing the received signal,

[0017] k=0,1,…,N-1 determine the frequency domain component of the received signal of each frame, where x i (m) is the i-th frame received signal obtained after windowing and framing, N is the frame length, j is the imaginary unit, and k is the sample number of each frame of the measured signal, that is, signal X i The k-th frame sample in the image, i is the frame number, m is the sample number in each frame, X i (k) is the frequency domain component of the received signal of each frame.

[0018] The step of performing average energy calculation on the received signal after the windowing and framing process to obtain noise average energy specifically includes:

[0019] according to Get the average noise energy, where D(k) is the average noise energy, N IS is the number of frames corresponding to the duration of the pure noise segment signal, IS is the duration of the pure noise segment signal, X i (k) is the frequency domain component of the received signal in each frame, i is the frame number, and k is the sample number of each frame of the measured signal, that is, signal X i The k-th frame sample in .

[0020] The step of subtracting the frequency domain component of the received signal of each frame from the noise average energy to obtain the received signal amplitude specifically includes:

[0021] according to Get the received signal amplitude, where: is the received signal amplitude, Xi (k) is the frequency domain component of the received signal of each frame, a is the over-subtraction factor, b is the gain compensation factor, and D(k) is the average noise energy.

[0022] The step of selecting the start and end point identification thresholds in the short-time energy diagram of the received signal after denoising specifically includes:

[0023] A first energy threshold is selected from the short-time energy diagram of the received signal after denoising to determine the initial position of the single-phase radiated electromagnetic wave signal.

[0024] A second energy threshold is selected from the short-time energy map of the received signal after denoising, and the second energy threshold is used as a start and end point identification threshold.

[0025] Among them, selecting the start and end point identification thresholds in the short-time energy diagram of the received signal after denoising specifically includes:

[0026] The first energy threshold is determined according to T1=a0*max(E), where T1 is the first energy threshold, a0 is the actual data on site, and max(E) is the maximum short-time energy value;

[0027] The second energy threshold is based on T2=E mean +3σ E Determine, where T2 is the second energy threshold, E mean is the average value of short-time energy, σ E is the standard deviation of the received signal after denoising.

[0028] The step of performing forward and backward searches on the denoised received signal at the start and end point recognition thresholds to determine the final position of the single-phase radiated electromagnetic wave signal specifically includes:

[0029] The two received signal energy points on the first energy threshold are used as index points.

[0030] Starting from the index point, the de-noised received signal is searched forward and backward according to the preset search positions on the start and end point recognition thresholds to determine the final position of the single-phase radiated electromagnetic wave signal.

[0031] A circuit breaker single-phase radiation electromagnetic wave signal detection system, the system comprising:

[0032] The receiving signal acquisition module is used to place the antenna covered with anisotropic absorbing material directly at any phase of the circuit breaker to be tested to acquire the receiving signal.

[0033] The denoising module is used to collect the received signal and denoise the frequency domain representation of each frame of the received signal.

[0034] The start and end point identification threshold selection module is used to select the start and end point identification thresholds in the short-time energy diagram of the received signal after denoising.

[0035] The final position determination module of the single-phase radiated electromagnetic wave signal is used to perform forward and backward searches on the denoised received signal at the start and end point recognition thresholds to determine the final position of the single-phase radiated electromagnetic wave signal.

[0036] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processor executes the steps of the method described above.

[0037] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the above method.

[0038] The embodiments of the present invention have the following beneficial effects:

[0039] The present invention uses an antenna covered with anisotropic absorbing materials, which can efficiently absorb specific frequencies and directions, reduce interference from environmental noise and other non-target signals, and significantly improve the accuracy and anti-interference ability of signal reception. By performing frequency domain analysis on each frame of the received signal, the frequency domain components of each frame of the received signal are obtained, and denoised, thereby improving the signal-to-noise ratio of the received signal after denoising. Furthermore, through the short-time energy diagram of the received signal after denoising, the distribution of signal energy can be intuitively observed, so as to select appropriate start and end point identification thresholds, and accurately locate the start and end positions of the single-phase radiated electromagnetic wave signal by forward and backward searching, thereby realizing the detection of the single-phase radiated electromagnetic wave signal of the circuit breaker, which is conducive to reducing the calculation amount of signal processing and improving signal recognition efficiency. The circuit breaker single-phase radiated electromagnetic wave signal detection method provided by the present invention has low sampling rate requirements and does not require the algorithm to separate the processing of the three-phase mixed signal, and can directly judge the single-phase state of the circuit breaker, thereby improving the efficiency of detection and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] in:

[0042] Figure 1 A schematic diagram of a flow chart of an embodiment of a method for detecting a single-phase radiated electromagnetic wave signal of a circuit breaker provided by the present invention;

[0043] Figure 2 A short-time energy diagram of a received signal after denoising provided by the present invention;

[0044] Figure 3 A schematic diagram of a flow chart of an embodiment of a method for detecting a single-phase radiated electromagnetic wave signal of a circuit breaker provided by the present invention;

[0045] Figure 4 A schematic structural diagram of an embodiment of a circuit breaker single-phase radiation electromagnetic wave signal detection system provided by the present invention;

[0046] Figure 5 A schematic structural diagram of an embodiment of the device provided by the present invention;

[0047] Figure 6 A schematic structural diagram of an embodiment of the medium provided by the present invention. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] like Figure 1 As shown, Figure 1 A schematic diagram of a flow chart of an embodiment of a method for detecting a single-phase electromagnetic wave signal radiated by a circuit breaker provided by the present invention. A method for detecting a single-phase electromagnetic wave signal radiated by a circuit breaker, the method comprising:

[0050] S101: An antenna covered with anisotropic absorbing material is placed directly at any phase of a circuit breaker to be tested to obtain a received signal.

[0051] For example, on the basis of the existing circuit breaker antenna, the signal receiving range of the antenna is controlled by adding a layer of anisotropic absorbing material shell. Since the anisotropic absorbing material has different absorption characteristics of electromagnetic waves in different directions, considering the relative positions of the three phases of the circuit breaker, an absorbing material is prepared that absorbs less electromagnetic waves incident from the front and more electromagnetic waves incident from the side. Therefore, the material can be covered on the outside of the existing antenna, so that the antenna only has a greater reception intensity for electromagnetic wave signals within a certain direction range, and obtains the received signal in this direction.

[0052] S102: Collect received signals, denoise the frequency domain components of each frame of received signals, and obtain denoised received signals.

[0053] Exemplarily, the received signal is collected by a signal collector, denoised and stored in a storage module. When the received signal is denoised, the received signal is first subjected to windowing and framing processing, and then a discrete Fourier transform is performed on each frame of the received signal after the windowing and framing processing to determine the frequency domain component of each frame of the received signal. Further, the received signal after the windowing and framing processing is subjected to average energy calculation to obtain the noise average energy. Further, the frequency domain component of each frame of the received signal is subtracted from the noise average energy to obtain the received signal amplitude. Finally, the received signal amplitude is combined with the phase angle of the frequency component, and the denoised received signal is obtained using an inverse fast Fourier transform.

[0054] S103: Selecting start and end point identification thresholds in the short-time energy diagram of the received signal after denoising.

[0055] For example, Figure 2 As shown, Figure 2 The short-time energy diagram of the denoised received signal provided by the present invention. First, the short-time energy of the denoised received signal is determined according to the formula shown below, and the short-time energy diagram is drawn:

[0056]

[0057] Among them, E n is the short-time energy of the received signal after denoising, n is the sampling point, n sampling points are 1 frame, and x(i) is the received signal after denoising of the i-th frame.

[0058] Furthermore, a first energy threshold T1 is selected from the short-time energy diagram of the received signal after denoising to determine the initial position of the single-phase radiated electromagnetic wave signal, and a second energy threshold T2 is selected from the short-time energy diagram of the received signal after denoising, and the second energy threshold T2 is used as the start and end point identification threshold.

[0059] The first energy threshold is determined according to the following formula:

[0060] T1 = a0*max(E);

[0061] Wherein, T1 is the first energy threshold, a0 is the actual data on site, and max(E) is the maximum short-time energy value.

[0062] The second energy threshold is determined according to the following formula:

[0063] T2=E mean +3σ E ;

[0064] Among them, T2 is the second energy threshold, E mean is the average value of short-time energy, σ E is the standard deviation of the received signal after denoising.

[0065] S104: Perform forward and backward searches on the denoised received signal at the start and end point recognition thresholds to determine the final position of the single-phase radiated electromagnetic wave signal.

[0066] For example, referring to Figure 2 , the two received signal energy points b and c on the first energy threshold are used as index points. Starting from index point b, search along the start and end point identification threshold to the left, and starting from index point c, search along the start and end point identification threshold to the right to find the starting point a and end point d of the pulse body respectively. The position interval between the starting point a and the end point d is the final position of the single-phase radiation electromagnetic wave signal.

[0067] It can be seen from the above description that the present invention uses an antenna covered with anisotropic absorbing materials, which can efficiently absorb specific frequencies and directions, reduce interference from environmental noise and other non-target signals, and significantly improve the accuracy and anti-interference ability of signal reception. By performing frequency domain analysis on each frame of the received signal, the frequency domain components of each frame of the received signal are obtained, and denoised, thereby improving the signal-to-noise ratio of the received signal after denoising. Furthermore, through the short-time energy diagram of the denoised received signal, the distribution of signal energy can be intuitively observed, so as to select appropriate start and end point identification thresholds, and accurately locate the start and end positions of the single-phase radiated electromagnetic wave signal by forward and backward searching, thereby realizing the detection of the single-phase radiated electromagnetic wave signal of the circuit breaker. The circuit breaker single-phase radiated electromagnetic wave signal detection method provided by the present invention has low sampling rate requirements and does not require the algorithm to separate the processing of the three-phase mixed signal, and can directly judge the single-phase state of the circuit breaker, thereby improving the efficiency of detection and maintenance.

[0068] like Figure 3 As shown, Figure 3 A schematic diagram of a flow chart of an embodiment of a method for detecting a single-phase electromagnetic wave signal radiated by a circuit breaker provided by the present invention. A method for detecting a single-phase electromagnetic wave signal radiated by a circuit breaker, the method comprising:

[0069] S201: An antenna covered with anisotropic absorbing material is placed directly at any phase of the circuit breaker to be tested to obtain a received signal.

[0070] It should be noted that step S201 Figure 1 This has been discussed in detail in the implementation scenario shown and will not be repeated here.

[0071] S202: After performing windowing and framing processing on the received signal, a discrete Fourier transform is performed on each frame of the received signal after the windowing and framing processing to determine a frequency domain component of each frame of the received signal.

[0072] Exemplarily, after the received signal is subjected to windowing and framing processing, a discrete Fourier transform is performed on each frame of the received signal after the windowing and framing processing, and the frequency domain component of each frame of the received signal is determined according to the following formula:

[0073]

[0074] Among them, x i (m) is the i-th frame received signal obtained after windowing and framing, N is the frame length, j is the imaginary unit, and k is the sample number of each frame of the measured signal, that is, signal X i The k-th frame sample in the image, i is the frame number, m is the sample number in each frame, X i (k) is the frequency domain component of the received signal of each frame.

[0075] S203: Calculate the average energy of the received signal after the windowing and framing process to obtain the noise average energy.

[0076] Exemplarily, the average energy of the received signal after windowing and framing is calculated, and the noise average energy is obtained according to the following formula:

[0077]

[0078] Where D(k) is the average noise energy, N IS is the number of frames corresponding to the duration of the pure noise segment signal, IS is the duration of the pure noise segment signal, X i (k) is the frequency domain component of the received signal in each frame, i is the frame number, and k is the sample number of each frame of the measured signal, that is, signal X I The k-th frame sample in .

[0079] S204: Subtract the frequency domain component of each frame of the received signal from the noise average energy to obtain the received signal amplitude.

[0080] Exemplarily, the frequency domain component of each frame of the received signal is subtracted from the noise average energy, and the received signal amplitude is obtained according to the following formula:

[0081]

[0082] in, is the received signal amplitude, X i (k) is the frequency domain component of the received signal of the i-th frame, a is the over-subtraction factor, b is the gain compensation factor, and D(k) is the average noise energy.

[0083] S205: Combine the received signal amplitude with the phase angle of the frequency component and use inverse fast Fourier transform to obtain a denoised received signal.

[0084] Exemplarily, the phase angle of the frequency domain component of each frame of received signal is as shown in the following formula:

[0085]

[0086] in, is the phase angle of the frequency domain component of the received signal of the i-th frame, X i (k) is the frequency domain component of the received signal of the i-th frame, lm() is the imaginary part of the frequency domain component of the received signal of the i-th frame, and Re() is the real part of the frequency domain component of the received signal of the i-th frame.

[0087] Furthermore, the received signal amplitude is combined with the phase angle of the frequency component, and the received signal after denoising is obtained using inverse fast Fourier transform. The over-subtraction factor a is set to 24, and the gain compensation factor b is set to 0.001.

[0088] S206: Selecting a first energy threshold from the short-time energy diagram of the received signal after denoising to determine an initial position of the single-phase radiated electromagnetic wave signal.

[0089] S207: Selecting a second energy threshold from the short-time energy graph of the received signal after denoising, and using the second energy threshold as a start and end point identification threshold.

[0090] S208: Two received signal energy points on the first energy threshold are used as index points.

[0091] S209: Starting from the index point, searching the denoised received signal forward and backward at the start and end point recognition thresholds according to preset search positions to determine the final position of the single-phase radiated electromagnetic wave signal.

[0092] like Figure 4 As shown, Figure 4 A schematic diagram of a circuit breaker single-phase radiation electromagnetic wave signal detection system according to an embodiment of the present invention. A circuit breaker single-phase radiation electromagnetic wave signal detection system 10 includes:

[0093] The receiving signal acquisition module 11 is used to place the antenna covered with anisotropic absorbing material directly at any phase of the circuit breaker to be tested to acquire the receiving signal.

[0094] The denoising module 12 is used to collect the received signal, denoise the frequency domain component of each frame of the received signal, and obtain the denoised received signal.

[0095] The start and end point identification threshold selection module 13 is used to select the start and end point identification thresholds in the short-time energy diagram of the received signal after denoising.

[0096] The single-phase radiated electromagnetic wave signal final position determination module 14 is used to perform forward and backward searches on the denoised received signal at the start and end point recognition thresholds to determine the final position of the single-phase radiated electromagnetic wave signal.

[0097] Exemplarily, in the receiving signal acquisition module 11, an antenna covered with anisotropic absorbing material is placed directly at any phase of the circuit breaker to be tested to acquire the receiving signal. In the denoising module 12, after the received signal is windowed and framed, a discrete Fourier transform is performed on each frame of the received signal after the windowing and framing process to determine the frequency domain component of each frame of the received signal; the average energy of the received signal after the windowing and framing process is calculated to obtain the noise average energy; the frequency domain component of each frame of the received signal is subtracted from the noise average energy to obtain the amplitude of the received signal; the amplitude of the received signal is combined with the phase angle of the frequency component, and the denoised received signal is obtained using the inverse fast Fourier transform. In the start-end point recognition threshold selection module 13, a first energy threshold is selected from the short-time energy diagram of the denoised received signal to determine the initial position of the single-phase radiated electromagnetic wave signal; a second energy threshold is selected from the short-time energy diagram of the denoised received signal, and the second energy threshold is used as the start-end point recognition threshold. In the single-phase radiation electromagnetic wave signal final position determination module 14, the two received signal energy points on the first energy threshold are used as index points; starting from the index points, the denoised received signals are searched forward and backward according to the preset search positions on the start and end point recognition thresholds to determine the final position of the single-phase radiation electromagnetic wave signal.

[0098] like Figure 5 As shown, Figure 5 The device 20 includes a memory 21 and a processor 22. The memory 21 stores a computer program, and the processor 22 executes the computer program when working to implement the following. Figure 1 and Figure 3 The method shown.

[0099] The specific technical details of a circuit breaker single-phase radiation electromagnetic wave signal detection method implemented when the above-mentioned device 20 executes a computer program have been discussed in detail in the above-mentioned method steps, so they will not be repeated here.

[0100] like Figure 6 As shown, Figure 6 The structure diagram of an embodiment of the medium provided by the present invention is shown in FIG. The medium 30 stores at least one computer program 31, and the computer program 31 is executed by the processor 22 to implement the following Figure 1 and Figure 3 In one embodiment, the medium 30 may be a storage chip, a hard disk, a mobile hard disk, a USB flash drive, an optical disk, or other readable and writable storage tools, or a server, etc.

[0101] The above describes specific embodiments of the present specification, and other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily have to be performed in the specific order or sequential order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0102] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device, equipment, and non-volatile computer-readable storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0103] The apparatus, device, non-volatile computer-readable storage medium and method provided in the embodiments of this specification correspond to each other, and therefore, the apparatus, device, and non-volatile computer storage medium also have similar beneficial technical effects as the corresponding methods. Since the beneficial technical effects of the methods have been described in detail above, the beneficial technical effects of the corresponding apparatus, device, and non-volatile computer storage medium will not be repeated here.

[0104] The systems, devices, modules or units described in the above embodiments may be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, the computer may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0105] For the convenience of description, the above device is described by being divided into various units according to their functions and described separately. Of course, when implementing this specification, the functions of each unit can be implemented in one or more software and / or hardware. It should be understood by those skilled in the art that this specification embodiment can be provided as a method, system, or computer program product. Therefore, this specification embodiment can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this specification embodiment can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0106] This specification is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of this specification. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0107] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0108] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0109] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0110] The memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0111] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0112] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0113] This specification may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. This specification may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules may be located in local and remote computer storage media, including storage devices.

[0114] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0115] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A method for detecting single-phase electromagnetic wave signals radiated by a circuit breaker, characterized in that: The method comprises: Place the antenna covered with anisotropic absorbing material directly at any phase of the circuit breaker to be tested to obtain a receiving signal; Collecting the received signal, denoising the frequency domain component of each frame of the received signal, and obtaining the denoised received signal; Selecting the start and end point identification thresholds in the short-time energy diagram of the received signal after denoising; The de-noised received signal is searched forward and backward respectively at the start and end point recognition thresholds to determine the final position of the single-phase radiated electromagnetic wave signal.

2. The circuit breaker single-phase radiation electromagnetic wave signal detection method according to claim 1, characterized in that: The collecting the received signal, denoising the frequency domain component of each frame of the received signal, and obtaining the denoised received signal specifically includes: After performing windowing and framing processing on the received signal, performing discrete Fourier transform on each frame of the received signal after the windowing and framing processing to determine the frequency domain component of each frame of the received signal; Calculating the average energy of the received signal after the windowing and framing process to obtain the average noise energy; Subtracting the frequency domain component of the received signal of each frame from the noise average energy to obtain the amplitude of the received signal; The received signal amplitude is combined with the phase angle of the frequency component, and the received signal after denoising is obtained by using inverse fast Fourier transform.

3. The method for detecting single-phase electromagnetic wave signals radiated by a circuit breaker according to claim 2, characterized in that: After the received signal is subjected to windowing and framing processing, discrete Fourier transform is performed on each frame of the received signal subjected to windowing and framing processing to determine the frequency domain component of each frame of the received signal, specifically comprising: After windowing and framing the received signal, k=0,1,…,N-1 determine the frequency domain component of the received signal of each frame, where x i (m) is the i-th frame received signal obtained after windowing and framing, N is the frame length, j is the imaginary unit, and k is the sample number of each frame of the measured signal, that is, signal X i The k-th frame sample in the image, i is the frame number, m is the sample number in each frame, X i (k) is the frequency domain component of the received signal of each frame.

4. The method for detecting single-phase electromagnetic wave signals radiated by a circuit breaker according to claim 3, characterized in that: The step of calculating the average energy of the received signal after the windowing and framing process to obtain the noise average energy specifically includes: according to Get the average noise energy, where D(k) is the average noise energy, N IS is the number of frames corresponding to the duration of the pure noise segment signal, I S is the duration of the pure noise segment signal, X i (k) is the frequency domain component of the received signal in each frame, i is the frame number, and k is the sample number of each frame of the measured signal, that is, signal X I The k-th frame sample in .

5. The circuit breaker single-phase radiation electromagnetic wave signal detection method according to claim 4, characterized in that: Subtracting the frequency domain component of the received signal of each frame from the noise average energy to obtain the received signal amplitude specifically includes: according to Get the received signal amplitude, where: is the received signal amplitude, X I (k) is the frequency domain component of the received signal of each frame, a is the over-subtraction factor, b is the gain compensation factor, and D(k) is the average noise energy.

6. The circuit breaker single-phase radiation electromagnetic wave signal detection method according to claim 2, characterized in that: The selecting the start and end point identification thresholds in the short-time energy diagram of the received signal after denoising specifically includes: Selecting a first energy threshold from the short-time energy diagram of the received signal after denoising to determine the initial position of the single-phase radiated electromagnetic wave signal; A second energy threshold is selected from the short-time energy map of the received signal after denoising, and the second energy threshold is used as a start and end point identification threshold.

7. The circuit breaker single-phase radiation electromagnetic wave signal detection method according to claim 6, characterized in that: The selecting the start and end point identification thresholds in the short-time energy diagram of the received signal after denoising specifically includes: The first energy threshold is determined according to T1=a0*max(E), where T1 is the first energy threshold, a0 is the actual data on site, and max(E) is the maximum short-time energy value; The second energy threshold is based on T2=E mean +3σ E Determine, where T2 is the second energy threshold, E mean is the average value of short-time energy, σ E is the standard deviation of the received signal after denoising.

8. The method for detecting single-phase electromagnetic wave signals radiated by a circuit breaker according to claim 6, characterized in that: The step of searching the denoised received signal forward and backward at the start and end point identification thresholds to determine the final position of the single-phase radiated electromagnetic wave signal specifically includes: Two received signal energy points on the first energy threshold are used as index points; Starting from the index point, the de-noised received signal is searched forward and backward according to the preset search positions on the start and end point recognition thresholds to determine the final position of the single-phase radiated electromagnetic wave signal.

9. A circuit breaker single-phase radiation electromagnetic wave signal detection system, characterized in that: The system comprises: A receiving signal acquisition module is used to place the antenna covered with anisotropic absorbing material directly at any phase of the circuit breaker to be tested to acquire a receiving signal; A denoising module, used for collecting the received signal and denoising the frequency domain representation of each frame of the received signal; A start and end point identification threshold selection module, used to select the start and end point identification thresholds in the short-time energy diagram of the received signal after denoising; The final position determination module of the single-phase radiated electromagnetic wave signal is used to perform forward and backward searches on the denoised received signal at the start and end point recognition thresholds to determine the final position of the single-phase radiated electromagnetic wave signal.

10. A computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, the processor is caused to perform the steps of the method according to any one of claims 1 to 8.

11. A computer device comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the method according to any one of claims 1 to 8.

Images