Intermittent Discharge Monitoring, Capture, Trend Analysis Method and System for Gas-insulated Switchgear

Abstract

The present invention relates to the technical field of intermittent discharge detection, and particularly to a method and system for monitoring, capturing and trend analysis of intermittent discharge in a combined electrical apparatus. By loading a carrier wave on the combined electrical apparatus and analyzing the carrier wave, the method of the present invention can effectively monitor and quickly capture intermittent discharge, and at the same time accurately locate the moment when the intermittent discharge occurs. After determining the existence of intermittent discharge, the discharge characteristics included in the intermittent discharge are determined by means of iterative calculation of the established discharge sample superposition model. Finally, the discharge development trend is judged according to the discharge characteristics. The present invention realizes functions such as accurate monitoring, rapid capture, precise positioning of the occurrence moment, and determination of discharge characteristics of intermittent discharge. On the basis of the above functions, by comparing the discharge characteristics with historical data, the discharge trend can be judged and predicted, ensuring the effective diagnosis of intermittent discharge in the combined electrical apparatus and the safe and reliable operation of the equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of intermittent discharge detection, and particularly to a method and system for monitoring, capturing and trend analysis of intermittent discharge in composite electrical apparatus. Background Art

[0002] A composite apparatus is a device that combines two or more electrical appliances into a whole according to wiring requirements, and each electrical appliance still maintains its original performance. It has a compact structure, small overall dimensions and installation size, is convenient to use, and the performance of each electrical appliance can be better coordinated. It can be divided into low-voltage composite apparatus and high-voltage composite apparatus according to the voltage level.

[0003] Taking GIS as an example, GIS (Gas Insulated Switchgear) is a combined switchgear that encloses various devices such as circuit breakers, disconnectors, earthing switches, and busbars in a metal shell filled with sulfur hexafluoride gas. GIS is a key device in high-voltage power transmission and transformation projects. Once a fault occurs, it may cause major power grid accidents. Insulation degradation is the main cause of GIS equipment failures. Online partial discharge detection of GIS can effectively monitor the internal insulation status of GIS and prevent power grid accidents caused by insulation failures and tripping of GIS.

[0004] During the operation of UHV GIS, serious discharge signals are monitored, but no obvious discharge defects are found after disassembly and inspection, resulting in waste of manpower, material resources and financial resources. On the other hand, maintenance personnel monitor intermittent discharge signals of UHV GIS. In most cases, the discharge signals disappear after continuous observation, but in some working conditions, breakdown occurs during continuous observation, making it difficult for maintenance personnel to make decisions and leaving equipment managers without support for post-processing of abnormal signals. Therefore, it is urgent to carry out research on GIS discharge fault detection to ensure effective diagnosis and safe and reliable operation of UHV GIS discharge faults.

[0005] Based on this, it is necessary to develop and design a method for monitoring, capturing and trend analysis of intermittent discharge in composite electrical apparatus. Summary of the Invention

[0006] Embodiments of the present invention provide a method and system for monitoring, capturing and trend analysis of intermittent discharge in composite electrical apparatus, which are used to solve the problem that intermittent discharge problems in the prior art are not easy to capture and analyze.

[0007] In a first aspect, embodiments of the present invention provide a method for monitoring, capturing and trend analysis of intermittent discharge in composite electrical apparatus, including:

[0008] Obtain a carrier waveform, multiple discharge samples, a historical discharge record, and a superposition model, where the multiple discharge samples are used to characterize multiple discharge characteristics, and the carrier is an electrical signal under a predetermined condition loaded onto the combined electrical apparatus;

[0009] Perform discharge analysis on the carrier waveform. If there is a discharge, intercept the intermittent discharge waveform according to the carrier waveform;

[0010] Process the intermittent discharge waveform to obtain multiple high-order harmonics, where the multiple high-order harmonics are the harmonics generated by the intermittent discharge;

[0011] Input the multiple discharge samples into the superposition model to obtain multiple discharge characteristics corresponding to the multiple high-order harmonics as the current discharge characteristics;

[0012] Determine whether there is a tendency for the intermittent discharge to worsen based on the current discharge characteristics and the historical discharge record.

[0013] In a possible implementation manner, the performing discharge analysis on the carrier waveform includes:

[0014] Determine whether there is a discharge in the combined electrical apparatus by analyzing the phase, frequency, and / or amplitude of the carrier;

[0015] Wherein, the determining whether there is a discharge in the combined electrical apparatus by analyzing the frequency of the carrier includes:

[0016] Determine an integral value according to the frequency of the carrier and a first formula. If the absolute value of the integral value is greater than a threshold, there is a discharge. The first formula is:

[0017]

[0018] In the formula, Δ is the integral value, T is the period of the carrier, m and n are both positive integers, and W(t) is the carrier waveform.

[0019] In a possible implementation manner, the superposition model includes:

[0020] Multiple input nodes, multiple weight nodes, an accumulator node, and an output node; the inputs of the weight nodes are connected to the input nodes in one-to-one correspondence, the input of the accumulator node is connected to the outputs of the multiple weight nodes, and the output of the accumulator node is connected to the input of the output node;

[0021] The number of input nodes is the same as the number of discharge samples; each weight node includes a weight calculator, and the accumulator node is used to accumulate according to the outputs of the multiple weight nodes;

[0022] The output node is used to calculate a residual according to the multiple high-order harmonics and the output of the accumulation node.

[0023] In a possible implementation manner, the inputting the multiple discharge samples into the superimposed model to obtain multiple discharge features corresponding to the multiple high-order harmonics as the current discharge features includes:

[0024] Obtain multiple weights, where the multiple weights correspond to the multiple discharge samples;

[0025] Sample input step: Input the multiple discharge samples into the multiple input nodes;

[0026] Determine a residual according to the multiple weights, the multiple discharge samples, and the multiple high-order harmonics;

[0027] If the residual is greater than a threshold, adjust the multiple weights according to the residual and jump to the sample input step;

[0028] If the residual is less than or equal to the threshold, use the discharge features represented by the discharge samples corresponding to the non-zero weights as the current discharge features.

[0029] In a possible implementation manner, the historical discharge record includes multiple discharge samples, and determining whether there is a tendency for the intermittent discharge to worsen according to the current discharge features and the historical discharge record includes:

[0030] Obtain multiple weights corresponding to the multiple discharge samples in the current discharge features;

[0031] Obtain multiple weights corresponding to the multiple discharge samples in the historical discharge record;

[0032] For each of the discharge samples, perform the following steps:

[0033] Compare the first weight with the second weight. If the first weight is greater than the second weight, the discharge sample corresponding to the current discharge feature has a tendency to worsen, where the first weight is the weight corresponding to the discharge sample in the current discharge feature, and the second weight is the weight corresponding to the discharge sample in the historical discharge record.

[0034] In a possible implementation manner, processing the intermittent discharge waveform to obtain multiple high-order harmonics, where the multiple high-order harmonics are the harmonics generated by the intermittent discharge, includes:

[0035] Obtain multiple high-order harmonics for the intermittent discharge waveform through a transformation algorithm, where the transformation algorithm includes at least one of the following: Fourier transform, wavelet transform, S transform, Z transform, and Laplace transform.

[0036] In a second aspect, an intermittent discharge monitoring, capturing and trend analysis device for a combined electrical apparatus according to an embodiment of the present invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the method described in the first aspect above are implemented.

[0037] In a possible implementation manner, the intermittent discharge monitoring, capturing and trend analysis device for the combined electrical apparatus further includes: a signal acquisition unit and a waveform recording unit, and the signal acquisition unit and the waveform recording unit are respectively electrically connected to the processor;

[0038] The signal acquisition unit is used to acquire the carrier wave on the combined electrical apparatus, and the waveform recording unit is used to store the waveform of the carrier wave.

[0039] In a third aspect, an intermittent discharge monitoring, capturing and trend analysis system for a combined electrical apparatus according to an embodiment of the present invention includes: a signal generator and the intermittent discharge monitoring, capturing and trend analysis device described in the second aspect, and the signal generator is signal-connected to the intermittent discharge monitoring, capturing and trend analysis device for the combined electrical apparatus;

[0040] The signal generator is used to generate an electrical signal with a predetermined frequency and a predetermined amplitude, and couple the electrical signal to the combined electrical apparatus as the carrier wave.

[0041] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the steps of the method described in any possible implementation manner of the first aspect above are implemented.

[0042] The beneficial effects of the embodiment of the present invention compared with the prior art are as follows:

[0043] By loading a carrier wave on the combined electrical apparatus and analyzing the carrier wave, the method of the present invention can effectively monitor and quickly capture intermittent discharges, and at the same time accurately locate the moment when the intermittent discharge occurs; after determining the existence of intermittent discharges, the discharge characteristics included in the intermittent discharges are determined by means of iterative calculation of the established discharge sample superposition model, and finally the discharge development trend is judged according to the discharge characteristics. The present invention realizes the functions of accurately monitoring and quickly capturing intermittent discharges, accurately locating the moment when the discharge occurs, and determining the discharge characteristics included in the intermittent discharges, and on the basis of the above functions, by comparing the discharge characteristics with historical data, the discharge trend can be judged and predicted, ensuring the effective diagnosis of intermittent discharge faults of the combined electrical apparatus and the safe and reliable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0045] Figure 1 is a flowchart of a method for monitoring and capturing intermittent discharges and trend analysis of a combined electrical apparatus provided by an embodiment of the present invention;

[0046] Figure 2 is a typical sample atlas during partial discharge of GIS provided by an embodiment of the present invention;

[0047] Figure 3 is a typical atlas of interference signals provided by an embodiment of the present invention;

[0048] Figure 4 is a superimposed model topology diagram provided by an embodiment of the present invention;

[0049] Figure 5 is a functional block diagram of a device for monitoring and capturing intermittent discharges and trend analysis of a combined electrical apparatus provided by an embodiment of the present invention;

[0050] Figure 6 is a functional block diagram of a system for monitoring and capturing intermittent discharges and trend analysis of a combined electrical apparatus provided by an embodiment of the present invention. Specific Embodiments

[0051] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. However, those skilled in the art should clearly understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, and methods are omitted to avoid unnecessary details from interfering with the description of the present invention.

[0052] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will be described through specific embodiments in conjunction with the drawings.

[0053] The following will provide a detailed description of the embodiments of the present invention. This example is implemented on the premise of the technical solution of the present invention, and detailed implementation manners and specific operation processes are given. However, the protection scope of the present invention is not limited to the following embodiments.

[0054] Figure 1 is a flowchart of a method for monitoring and capturing intermittent discharges and trend analysis of a combined electrical apparatus provided by an embodiment of the present invention.

[0055] AsFigure 1 As shown, it shows the implementation flowchart of the intermittent discharge monitoring and capture and trend analysis method for combined electrical appliances provided by the embodiments of the present invention, which is described in detail as follows:

[0056] In step 101, a carrier waveform, a plurality of discharge samples, historical discharge records, and a superposition model are obtained, where the plurality of discharge samples are used to characterize a plurality of discharge characteristics, and the carrier is an electrical signal under a predetermined condition loaded onto the combined electrical appliance.

[0057] In some embodiments, the superposition model includes:

[0058] A plurality of input nodes, a plurality of weight nodes, an accumulator node, and an output node; the inputs of the weight nodes are connected to the input nodes in one-to-one correspondence, the input of the accumulator node is connected to the outputs of the plurality of weight nodes, and the output of the accumulator node is connected to the input of the output node;

[0059] The number of input nodes is the same as the number of discharge samples; each of the weight nodes includes a weight calculator, and the accumulator node is used to accumulate according to the outputs of the plurality of weight nodes;

[0060] The output node is used to calculate the residual according to the plurality of high-order harmonics and the output of the accumulator node.

[0061] Exemplarily, the carrier is an electrical signal loaded onto the combined electrical appliance, and the frequency of this electrical signal is much higher than the power frequency, so it can be clearly distinguished from the high-order harmonics of the power frequency current. In a specific application scenario, the frequency and amplitude of the carrier are both set.

[0062] The plurality of discharge samples refer to the frequencies and / or amplitudes of electrical signals corresponding to different discharge attributes. For example, in an application scenario, the discharge caused by defect A includes an electrical signal with an amplitude of B and a frequency of C and an electrical signal with an amplitude of D and a frequency of E. That is to say, the discharge sample is the correspondence between the electrical signal frequency and / or amplitude and the defect, and it is a spectral manifestation during discharge.

[0063] Specifically in practical applications, taking the ultra-high frequency monitoring technology as an example, the discharge samples include: free particle discharge, floating potential body discharge, internal air gap discharge of insulating parts, surface discharge of insulating parts, and metal tip discharge. As Figure 2 shown, this figure shows the typical sample atlas during partial discharge of GIS. In this figure, the column of the typical discharge waveform corresponds to the power frequency voltage, which is the time domain diagram of different discharge samples. The column of the typical discharge atlas is the time-frequency diagram of different discharge samples, which can be regarded as for different discharge samples, each discharge can correspondingly transform into discharge signals with different amplitudes and different frequencies.

[0064] A discharge sample in practical applications may also include interference signals (interference signals generated from the outside that may be included in the collected signals), such as: mobile phone signals, radar signals, fluorescent lamp interference, and engine interference. As Figure 3 shown, the figure shows a typical spectrum of interference signals. In this figure, one column of typical interference waveforms corresponds to the power frequency voltage, which may be the generated interference time domain diagram. One column of typical interference spectra is the time-frequency diagram of different interference samples, which can be regarded as samples corresponding to each interference signal. Each interference signal can be transformed to obtain discharge signals with different amplitudes and different frequencies.

[0065] Those skilled in the art should understand that the above examples of discharge samples in specific practical applications are examples provided for easy understanding, rather than limitations.

[0066] Historical discharge records refer to the discharge defects that occurred in different historical periods and the electrical signal characteristics corresponding to these defects (such as the frequency and / or amplitude of the electrical signals as described above).

[0067] As Figure 2 shown, the figure provides a superimposed model. The superimposed model includes four layers of structure. The leftmost is the input layer, which corresponds to inputting each discharge sample. The data input by the input layer is multiplied by the weights on the weight side to obtain intermediate data with coefficients. The intermediate data is then accumulated by the accumulation node and finally sent to the output node. The output node calculates the deviation between the accumulated result of the intermediate data and each high-order harmonic as the residual.

[0068] The residual is used to guide the improvement of the weights of the weight layer, and finally achieve the purpose of fitting each high-order harmonic with the discharge sample.

[0069] In step 102, perform discharge analysis on the carrier waveform. If there is a discharge, intercept the intermittent discharge waveform according to the carrier waveform.

[0070] In some embodiments, the performing discharge analysis on the carrier waveform includes:

[0071] Determine whether there is a discharge in the combined electrical apparatus by analyzing the phase, frequency, and / or amplitude of the carrier;

[0072] Among them, the determining whether there is a discharge in the combined electrical apparatus by analyzing the frequency of the carrier includes:

[0073] Determine the integral value according to the frequency of the carrier and the first formula. If the absolute value of the integral value is greater than the threshold, there is a discharge. The first formula is:

[0074]

[0075] Wherein, Δ is the integral value, T is the period of the carrier wave, m and n are both positive integers, and W(t) is the carrier wave form.

[0076] Exemplarily, there are various ways to analyze the carrier wave form. For example, whether the carrier wave is distorted due to discharge interference can be analyzed through phase, frequency, and / or amplitude.

[0077] In one application scenario, it is carried out according to the frequency of the carrier wave.

[0078] As we know, when the combined electrical apparatus operates normally, the integral of the carrier wave within one period (usually the carrier wave is a sine wave) is 0. When the combined electrical apparatus generates discharge, the carrier wave is affected by the discharge and includes multiple high-frequency harmonics within the original carrier wave frequency. If these high-frequency harmonics are integrated within one period of the original carrier wave frequency, the original carrier wave frequency will be filtered out, and the high-order harmonics will be retained, that is, the separation of the original carrier wave frequency is achieved.

[0079] In some application scenarios, the discharge is intermittent. If the waveforms of each period are integrated, obviously, the computational burden is large and it seems unnecessary. Therefore, in order to improve the processing speed, generally, the integration is carried out for several periods corresponding to the original frequency of the carrier wave. That is to say, the integration is carried out for multiple continuous waveforms. If there are high-order harmonics in the multiple continuous waveforms, then the integral value cannot be ignored.

[0080] The above process is expressed by the formula as follows:

[0081]

[0082] Wherein, Δ is the integral value, T is the period of the carrier wave, m and n are both positive integers, and W(t) is the carrier wave form.

[0083] In step 103, the intermittent discharge waveform is processed to obtain multiple high-order harmonics, and the multiple high-order harmonics are the harmonics generated by the intermittent discharge.

[0084] In some embodiments, step 103 includes:

[0085] Multiple high-order harmonics are obtained from the intermittent discharge waveform through a transformation algorithm, and the transformation algorithm includes at least one of the following: Fourier transform, wavelet transform, S transform, Z transform, and Laplace transform.

[0086] Exemplarily, as we know, when performing a Fourier transform on the fundamental wave containing the discharge waveform, the transformation from the time domain to the frequency domain can be achieved, and multiple waveforms corresponding to different frequencies, different amplitudes, and different phases can be separated.

[0087] The waveforms of each frequency transformed by the transformation algorithm of the discharge waveform may include the fundamental wave. As can be seen from the above analysis, the fundamental wave is the carrier wave. For the analysis of partial discharge, the higher harmonics should be analyzed. Therefore, the fundamental wave obtained by transformation should be discarded.

[0088] In step 104, the multiple discharge samples are input into the superposition model, and multiple discharge characteristics corresponding to the multiple higher harmonics are obtained as the current discharge characteristics.

[0089] In some embodiments, step 104 includes:

[0090] Obtain multiple weights, where the multiple weights correspond to the multiple discharge samples;

[0091] Sample input step: Input the multiple discharge samples into the multiple input nodes;

[0092] Determine the residual according to the multiple weights, the multiple discharge samples, and the multiple higher harmonics;

[0093] If the residual is greater than the threshold, adjust the multiple weights according to the residual and jump to the sample input step;

[0094] If the residual is less than or equal to the threshold, use the discharge characteristics represented by the discharge samples with non-zero weights as the current discharge characteristics.

[0095] Exemplarily, the harmonic characteristics corresponding to multiple discharge samples may be included in the higher harmonics. If harmonic analysis is performed on the higher harmonics, the discharge samples that the higher harmonics may contain can be determined.

[0096] Therefore, the present invention uses the superposition model to perform harmonic analysis on the higher harmonics by means of sample harmonic weight iteration. First, predict the weights corresponding to different discharge samples, and then send them into the superposition model mentioned above to obtain the superimposed waveform, calculate the residual with the higher harmonics. If the residual is positive (the residual is the difference between each higher harmonic and the superimposed waveform), the weights are weighted, and conversely, if the residual is negative, the weights are de-weighted.

[0097] For example, in an application scenario, the formula of the waveform after superposition is:

[0098] W(t) = aW 1 (t) + bW 2 (t) + cW 3 (t)

[0099] In the formula, W(t) is the superimposed waveform, W 1 (t), W 2 (t), W 3(t) is the harmonic wave of each frequency.

[0100] The waveform formula of the high-order harmonic is:

[0101] W'(t) = a'W 1 '(t) + b'W 2 '(t) + c'W 3 '(t)

[0102] In the formula, W'(t) is the high-order harmonic, and W 1 '(t), W 2 '(t), W 3 '(t) are the harmonic waves of each frequency.

[0103] Then the residual is:

[0104] ΔW(t) = ΔaW 1 (t) + ΔbW 2 (t) + ΔcW 3 (t)

[0105] We should adjust the weights of each sample according to Δa, Δb, and Δc. For example, one possibility is that if Δa, Δb, and Δc are all positive values, then weighting should be performed; another possibility is that if Δa, Δb, and Δc are all negative values, then de-weighting should be performed.

[0106] In step 105, according to the current discharge characteristics and the historical discharge records, determine whether there is a tendency for intermittent discharge to worsen.

[0107] In some embodiments, step 105 includes:

[0108] Obtain multiple weights corresponding to multiple discharge samples in the current discharge characteristics;

[0109] Obtain multiple weights corresponding to multiple discharge samples in the historical discharge records;

[0110] For each of the discharge samples, perform the following steps:

[0111] Compare the first weight with the second weight. If the first weight is greater than the second weight, then the corresponding discharge sample in the current discharge characteristics has a tendency to worsen, where the first weight is the weight corresponding to the discharge sample in the current discharge characteristics, and the second weight is the weight corresponding to the discharge sample in the historical discharge records.

[0112] Exemplarily, for the weights corresponding to each discharge sample in the current discharge characteristics and the weights corresponding to each discharge sample in the historical discharge records, it is obvious to compare the trends. If the weight is greater than before, it indicates a tendency to worsen.

[0113] Embodiment of the method for monitoring, capturing and trend analysis of intermittent discharge in a combined electrical apparatus of the present invention. By obtaining discharge samples and carrier waveforms, analyzing the discharge waveforms to determine whether there is a discharge. If there is a discharge, based on the existing discharge samples, the characteristics of the included discharge are determined through an iterative method, and whether the discharge has a tendency to worsen is determined according to the discharge characteristics. In the embodiment of the present invention, the discharge characteristics can be captured through the carrier, the cause of the discharge can be determined by the way of sample superposition, and the development trend of the discharge can be determined by comparing the discharge characteristics with historical data, ensuring the effective diagnosis of GIS discharge faults and safe and reliable operation.

[0114] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0115] The following is the device embodiment of the present invention. For the details not described in detail therein, reference can be made to the corresponding method embodiments above.

[0116] Figure 3 It is a functional block diagram of the device for monitoring, capturing and trend analysis of intermittent discharge in a combined electrical apparatus provided by the embodiment of the present invention. Referring to Figure 3 , the device 3 for monitoring, capturing and trend analysis of intermittent discharge in a combined electrical apparatus includes:

[0117] A memory 301, a processor 300, and a computer program 302 stored in the memory and executable on the processor. When the processor 300 executes the computer program 302, the steps of the method described in the first aspect above are implemented.

[0118] As Figure 4 shown, in some embodiments, the device for monitoring, capturing and trend analysis of intermittent discharge in a combined electrical apparatus further includes: a signal acquisition unit 304 and a waveform recording unit 303. The signal acquisition unit 304 and the waveform recording unit 303 are respectively electrically connected to the processor 300;

[0119] The signal acquisition unit 304 is used to acquire the carrier on the combined electrical apparatus, and the waveform recording unit 303 is used to store the waveform of the carrier.

[0120] Exemplarily, one embodiment of the signal acquisition unit 304 is a high-frequency current transformer and an analog-to-digital conversion circuit. The analog-to-digital conversion circuit converts the current signal collected by the high-frequency current transformer into a digital signal and sends it to the processor 300 for processing.

[0121] Figure 4 It is a functional block diagram of the system for monitoring, capturing and trend analysis of intermittent discharge in a combined electrical apparatus provided by the embodiment of the present invention. AsFigure 4 As shown, this embodiment includes: a signal generator 401 and a combined electrical apparatus intermittent discharge monitoring, capture and trend analysis device 3 as described in the second aspect. The signal generator 401 is signal-connected to the combined electrical apparatus intermittent discharge monitoring, capture and trend analysis device 3.

[0122] The signal generator 401 is used to generate an electrical signal with a predetermined frequency and a predetermined amplitude, and couple the electrical signal to the combined electrical apparatus as the carrier wave.

[0123] Exemplarily, the computer program 302 can be divided into one or more modules / units. The one or more modules / units are stored in the memory 301 and executed by the processor 300 to complete the present invention.

[0124] The combined electrical apparatus intermittent discharge monitoring, capture and trend analysis device 3 can be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The combined electrical apparatus intermittent discharge monitoring, capture and trend analysis device 3 can include, but is not limited to, a processor 300 and a memory 301. Those skilled in the art can understand that Figure 4 merely examples of the combined electrical apparatus intermittent discharge monitoring, capture and trend analysis device 3, which do not constitute a limitation to the combined electrical apparatus intermittent discharge monitoring, capture and trend analysis device 3. It may include more or fewer components than shown in the figure, or combine certain components, or different components. For example, the terminal may further include input / output devices, network access devices, buses, etc.

[0125] The so-called processor 300 may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0126] The memory 301 may be an internal storage unit of the intermittent discharge monitoring and capture, trend analysis device 3 of the combined electrical apparatus, such as the hard disk or memory of the intermittent discharge monitoring and capture, trend analysis device 3 of the combined electrical apparatus. The memory 301 may also be an external storage device of the intermittent discharge monitoring and capture, trend analysis device 3 of the combined electrical apparatus, such as a plug-in hard disk, a SmartMedia Card (SMC), a Secure Digital (SD) card, a Flash Card, etc. equipped on the intermittent discharge monitoring and capture, trend analysis device 3 of the combined electrical apparatus. Further, the memory 301 may also include both an internal storage unit of the intermittent discharge monitoring and capture, trend analysis device 3 of the combined electrical apparatus and an external storage device. The memory 301 is used to store the computer program and other programs and data required by the terminal. The memory 301 may also be used to temporarily store the data that has been output or will be output.

[0127] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above division of each functional unit and module is used as an example for illustration. In actual applications, the above functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiments can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of each functional unit and module are only for the convenience of mutual distinction and do not limit the protection scope of the present application. The specific working processes of the units and modules in the above system can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0128] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not detailed or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0129] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or by a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0130] In the embodiments provided by the present invention, it should be understood that the disclosed device / terminal and method can be implemented in other ways. For example, the device / terminal embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections between each other can be through some interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical or other forms.

[0131] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0132] In addition, each functional unit in various embodiments of the present invention can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0133] When the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, to implement all or part of the processes in the above-described embodiments of the method, it can also be completed by a computer program instructing relevant hardware. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps corresponding to the above-described intermittent discharge monitoring and capture and trend analysis methods of the combined electrical apparatus can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file, or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0134] The above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A method for monitoring, capturing and trend analysis of intermittent discharge of combined electrical appliances. It is characterized in that include: Acquire a carrier waveform, a plurality of discharge samples, a historical discharge record, and a superposition model, wherein the plurality of discharge samples are used to characterize a plurality of discharge characteristics, and the carrier is an electrical signal of a predetermined condition loaded on the combined electrical appliance; Performing a discharge analysis on the carrier waveform, and if there is discharge, intercepting an intermittent discharge waveform according to the carrier waveform; processing the intermittent discharge waveform to obtain a plurality of higher harmonics, wherein the plurality of higher harmonics are harmonics generated by the intermittent discharge; Input the multiple discharge samples into the superposition model to obtain multiple discharge features corresponding to the multiple high-order harmonics as current discharge features; determine whether the intermittent discharge has a tendency to worsen according to the current discharge features and the historical discharge records; The superposition model includes: a plurality of input nodes, a plurality of weight nodes, an accumulation node and an output node; the number of the input nodes is the same as the number of the discharge samples; the inputs of the weight nodes are connected to the input nodes in a one-to-one correspondence, and each of the weight nodes includes a weight calculator; the accumulation node is used to accumulate according to the outputs of the plurality of weight nodes, the input of the accumulation node is connected to the outputs of the plurality of weight nodes, and the output of the accumulation node is connected to the input of the output node; the output node is used to calculate the residual according to the plurality of high-order harmonics and the output of the accumulation node; The step of inputting the multiple discharge samples into the superposition model to obtain multiple discharge features corresponding to the multiple high-order harmonics as current discharge features includes: obtaining multiple weights, wherein the multiple weights correspond to the multiple discharge samples; a sample input step: inputting the multiple discharge samples into the multiple input nodes; determining residuals according to the multiple weights, the multiple discharge samples and the multiple high-order harmonics; if the residuals are greater than a threshold, adjusting the multiple weights according to the residuals and jumping to the sample input step; if the residuals are less than or equal to a threshold, taking the discharge features represented by the discharge samples corresponding to the weights not being 0 as the current discharge features.

2. The intermittent discharge monitoring, capturing and trend analysis method of combined electrical appliances according to claim 1, It is characterized in that The performing discharge analysis on the carrier waveform includes: Determining whether the combined electrical appliance is discharged by analyzing the phase, frequency and / or amplitude of the carrier; Wherein, determining whether the combined electrical appliance is discharged by analyzing the frequency of the carrier wave comprises: The integral value is determined according to the frequency of the carrier and a first formula. If the absolute value of the integral value is greater than a threshold, there is a discharge. The first formula is: In the formula, is the integral value, T is the period of the carrier, m as well as n are all positive integers, is the carrier waveform.

3. The method for monitoring, capturing and trend analysis of intermittent discharge of combined electrical appliances according to claim 1, It is characterized in that The historical discharge record includes a plurality of discharge samples, and determining whether the intermittent discharge has a tendency to increase according to the current discharge characteristics and the historical discharge record includes: Acquire multiple weights corresponding to multiple discharge samples in the current discharge feature; Acquire multiple weights corresponding to multiple discharge samples in the historical discharge record; For each of the discharge samples, the following steps are performed: Compare the first weight and the second weight. If the first weight is greater than the second weight, the discharge sample corresponding to the current discharge feature has an aggravating trend, wherein the first weight is the weight corresponding to the discharge sample in the current discharge feature, and the second weight is the weight corresponding to the discharge sample in the historical discharge record.

4. The method for monitoring, capturing and trend analysis of intermittent discharge of a combined electrical appliance according to any one of claims 1 to 3, It is characterized in that The intermittent discharge waveform is processed to obtain a plurality of higher harmonics, wherein the plurality of higher harmonics are harmonics generated by the intermittent discharge, and include: The intermittent discharge waveform is subjected to a transformation algorithm to obtain a plurality of higher harmonics, wherein the transformation algorithm comprises at least one of the following: Fourier transformation, wavelet transformation, S transformation, Z transformation and Laplace transformation.

5. A device for monitoring, capturing and analyzing intermittent discharge of a combined electrical appliance, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, It is characterized in that When the processor executes the computer program, the steps of the method according to any one of claims 1 to 4 are implemented.

6. The device for monitoring, capturing and analyzing intermittent discharge of combined electrical appliances according to claim 5, It is characterized in that The combined electrical intermittent discharge monitoring, capturing and trend analysis device further comprises: a signal acquisition unit and a wave recording unit, wherein the signal acquisition unit and the wave recording unit are electrically connected to the processor respectively; The signal acquisition unit is used for acquiring the carrier wave on the combined electrical appliance, and the waveform recording unit is used for storing the waveform of the carrier wave.

7. A system for monitoring, capturing and trend analysis of intermittent discharge of combined electrical appliances. It is characterized in that include: A signal generator and a combined electrical appliance intermittent discharge monitoring, capturing and trend analysis device as claimed in claim 5 or 6, wherein the signal generator is signal-connected to the combined electrical appliance intermittent discharge monitoring, capturing and trend analysis device; The signal generator is used to generate an electrical signal of a predetermined frequency and a predetermined amplitude, and couple the electrical signal to the combined electrical appliance as the carrier.

8. A computer-readable storage medium storing a computer program. It is characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 4 are implemented.

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