A wireless communication transformer winding deformation frequency response detection calculation system and method

Abstract

The invention discloses a transformer winding deformation frequency response method detection operation system and method with wireless communication, the system comprising: a host computer control unit and a lower computer detection unit; the host computer control unit comprises a host computer instruction module and a host computer wireless communication module; the lower computer detection unit comprises a lower computer wireless communication module, a sweep signal generation module, a signal processing module and a signal calculation module; the host computer instruction module is converted into a host computer instruction according to user requirements; the host computer instruction is sent to the lower computer detection unit through wireless communication; the lower computer detection unit is connected to the transformer winding load to be detected, the lower computer detection unit has a detection operation function, collects and calculates the load output signal, and uploads it to the host computer for detection and analysis; the system and method avoid long-distance wiring, and avoid the problems of low detection accuracy and consistency and low detection efficiency in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and more specifically, to a wireless communication transformer winding deformation frequency response method detection calculation system and method. Background Art

[0002] Power transformers are key core equipment in the power system, and the equipment is installed and used in a huge amount in the power grid system. Its operating reliability is directly related to the power supply safety of the power system. However, in recent years, transformer winding deformation failures have occurred frequently, ranking first among transformer failures. According to incomplete statistics, transformer winding deformation failures account for 33.8% of all transformer failures. Frequent transformer winding deformation failures have led to great concerns about equipment reliability, especially as the scale of power systems becomes larger and larger, the capacity becomes higher and higher, and the system short-circuit current level increases year by year. The hidden dangers of transformer winding deformation failures are more prominent. After the system is short-circuited, how to quickly and effectively detect whether the transformer winding is deformed and avoid transformer failure and damage has become a key issue for operation and maintenance units and needs to be solved urgently.

[0003] The frequency response method is currently recognized as the most effective technical means to detect winding deformation, and has achieved good application results in offline detection of transformer winding deformation. However, the existing application of the frequency response method has the following problems:

[0004] (1) The detection accuracy and consistency are low. In the existing technology, the distance between the signal generation and collection point and the test point of the transformer under test is too large, usually a spatial distance of 10 meters to 20 meters. The two are connected by a long coaxial line, and the coaxial line shielding layer is connected to the grounding point through a long-distance grounding wire. Since high-frequency signals are greatly affected by spatial coupling interference when propagating in long-distance transmission lines, the measured high-frequency signals are severely attenuated and distorted, affecting the accuracy of the calculation results. At the same time, the on-site wiring environment is relatively complex. It is difficult to ensure that the direction and position of the signal connection are completely consistent for each test of the same test product. The effect of stray parameters on the test results is different in each test, resulting in low test consistency.

[0005] (2) Low detection efficiency. Existing detection technologies require a large number of long-distance cables and power supply systems. The system structure is complex and the wiring is cumbersome, which results in excessive time spent on wiring and disconnecting during the detection process, seriously reducing the detection efficiency.

[0006] (3) The detection range is difficult to expand. The existing detection technology concentrates the algorithm on the host computer and the detection circuit on the slave computer. The algorithm is separated from the detection circuit, and all the original detection data must be uploaded to the host computer for unified calculation. This model leads to excessive redundancy of detection data, and the detection range of a single machine is difficult to expand. Summary of the invention

[0007] In order to solve the problems of complicated wiring, low detection accuracy and consistency, low detection efficiency, etc. in the field application of the existing detection methods and devices in the background technology, the present invention provides a wireless communication transformer winding deformation frequency response method detection operation system and method, the system and method realize the interaction between the field detection device and the host computer control unit through a wireless network, sink the detection operation to the hardware detection circuit, so that signal acquisition, data processing and calculation are all realized on site, the wireless communication transformer winding deformation frequency response method detection operation system comprises:

[0008] A host computer control unit and a lower computer detection unit; the host computer control unit includes a host computer instruction module and a host computer wireless communication module; the lower computer detection unit includes a lower computer wireless communication module, a sweep signal generation module, a signal processing module and a signal calculation module;

[0009] The host computer instruction module is used to receive the user's control requirement information and convert it into a preset host computer instruction; the host computer instruction unit is connected to the host computer wireless communication module; the host computer instruction module sends the host computer instruction to the lower computer detection unit through the host computer wireless communication module; the host computer instruction includes sweep frequency signal information;

[0010] The upper computer wireless communication module and the lower computer wireless communication module are used to establish a communication channel for data transmission through a preset wireless communication protocol;

[0011] The output end of the frequency sweep signal generating module is connected to the input end of the transformer winding load to be detected; the input end of the signal processing module is connected to the output end of the transformer winding load to be detected;

[0012] The sweep frequency signal generating module obtains the sweep frequency signal information in the upper computer instruction through the lower computer wireless communication module, generates a sweep frequency signal according to the sweep frequency signal information, and outputs the sweep frequency signal to the transformer winding load;

[0013] The signal processing module has two input terminals, which are respectively connected to the two output terminals of the transformer winding load to be detected;

[0014] The signal processing module is used to pre-process the two output signals of the transformer winding load to be detected according to a preset rule, and transmit the two output signals after pre-processing to the input end of the signal calculation module;

[0015] The signal calculation module is used to calculate and obtain detection parameters according to the two input signals and preset rules, and upload the detection parameters to the upper computer control unit through the lower computer wireless communication module;

[0016] The host computer control unit is used to analyze the detection parameters according to a preset analysis method to obtain the transformer winding deformation detection result.

[0017] Furthermore, the frequency sweep signal information includes the signal peak value, the frequency sweep start frequency, the frequency sweep end frequency, the frequency sweep mode and the number of frequency sweep points;

[0018] The signal peak value, the frequency sweep start frequency, the frequency sweep mode and the frequency sweep cutoff frequency are determined by receiving control requirement information determined by the user within a corresponding preset parameter range.

[0019] Furthermore, the frequency sweeping mode includes a linear frequency sweeping mode and a logarithmic frequency sweeping mode;

[0020] The host computer instruction module is used to determine the frequency array according to the frequency sweep start frequency, frequency sweep end frequency, frequency sweep mode and frequency sweep point number;

[0021] The frequency sweep signal generating module generates the frequency sweep signal in sequence according to the frequency values ​​in the frequency array;

[0022] When the frequency sweep mode is a linear frequency sweep mode, the frequency array is calculated as follows:

[0023]

[0024] When the frequency sweep mode is a logarithmic frequency sweep mode, the frequency array is calculated as follows:

[0025]

[0026] Wherein, f2 is the sweep cutoff frequency, f1 is the sweep start frequency, N is the number of sweep points, i is the number of sweeps, i=0,1,2…N-1.

[0027] Furthermore, the signal processing module includes a bandpass filtering submodule and an AD acquisition submodule;

[0028] The bandpass filter submodule is used to filter the two output signals of the transformer winding load to be detected according to one or more preset filter frequency bands to obtain the two output signals after filtering;

[0029] The AD acquisition submodule is used to perform AD conversion on the filtered output signal to obtain two digital output signals.

[0030] Furthermore, the host computer instruction includes filtering control information; the bandpass filtering submodule is used to determine whether to perform bandpass filtering according to the filtering control information; if it is determined not to perform bandpass filtering, the original two-way output signal is transmitted to the AD acquisition submodule.

[0031] Furthermore, the signal processing module also includes a range adjustment submodule;

[0032] The range adjustment submodule is used to determine whether the acquisition range of the search output signal needs to be adjusted according to a preset judgment method;

[0033] The preset judgment method includes comparing the signal peak value of the currently collected output signal with the current range. If the signal peak value is within the preset proportion range of the current range, no range adjustment is required; if the signal peak value is higher than the preset proportion range of the current range, the range is increased according to the preset proportion; if the signal peak value is lower than the preset proportion range of the current range, the range is decreased according to the preset proportion.

[0034] Furthermore, the signal calculation module calculates the detection parameters including amplitude-frequency parameters and phase-frequency parameters;

[0035] The calculation formula of the amplitude-frequency parameter H is:

[0036] H=20lg(V2 / V1)

[0037] The calculation formula of the phase-frequency parameter C is:

[0038] C=θ2-θ1

[0039] Among them, H is the amplitude-frequency parameter; V1 is the peak-to-peak value of the waveform collected by the first channel; V2 is the peak-to-peak value of the waveform collected by the second channel; C is the phase-frequency parameter; θ1 is the initial phase of the waveform collected by the first channel; θ2 is the initial phase of the waveform collected by the second channel.

[0040] Furthermore, the lower computer detection unit also includes a storage module and a process control module;

[0041] The storage module is used to associate and store the detection parameters calculated by the signal calculation module and the current frequency;

[0042] The process control module is used to determine whether the frequency sweep process is completed according to the current frequency and the frequency sweep cut-off frequency; when it is determined that the frequency sweep process is completed, the multiple groups of detection parameters stored in the storage module are uploaded to the host computer control unit;

[0043] The process control module is used to generate a process instruction after calculating each set of detection parameters; when the frequency sweep process is not completed, the process instruction includes the current frequency value; when the frequency sweep process is completed, the process instruction is a preset process instruction representing the completion of the frequency sweep;

[0044] After receiving the process instruction representing the end of the frequency sweep, the host computer control unit receives multiple groups of inspection parameters.

[0045] The wireless communication transformer winding deformation frequency response method detection calculation method comprises:

[0046] Receive control request information from the user and generate host computer instructions; the host computer instructions include frequency sweep signal information;

[0047] The host computer command is transmitted to the lower computer detection unit through a wireless communication method; a sweep frequency signal is generated through the sweep frequency signal information of the host computer command and output to the transformer winding load;

[0048] Collecting two output signals of the transformer winding load to be detected, preprocessing the two output signals to obtain the two output signals after preprocessing;

[0049] Calculate and obtain detection parameters based on the two output signals after preprocessing and preset rules;

[0050] The detection parameters are uploaded to a host computer control unit through a wireless communication method; the detection parameters are analyzed according to a preset analysis method to obtain the transformer winding deformation detection result.

[0051] Furthermore, the frequency sweep signal information includes the signal peak value, the frequency sweep start frequency, the frequency sweep end frequency, the frequency sweep mode and the number of frequency sweep points;

[0052] The signal peak value, the frequency sweep start frequency, the frequency sweep mode and the frequency sweep cutoff frequency are determined by receiving control requirement information determined by the user within a corresponding preset parameter range.

[0053] Further, the frequency array is determined according to the frequency sweep start frequency, the frequency sweep end frequency, the frequency sweep mode and the number of frequency sweep points; the frequency sweep mode includes a linear frequency sweep mode and a logarithmic frequency sweep mode;

[0054] Generating frequency sweep signals in sequence according to the frequency values ​​in the frequency array;

[0055] When the frequency sweep mode is a linear frequency sweep mode, the frequency array is calculated as follows:

[0056]

[0057] When the frequency sweep mode is a logarithmic frequency sweep mode, the frequency array is calculated as follows:

[0058]

[0059] Wherein, f2 is the sweep cutoff frequency, f1 is the sweep start frequency, N is the number of sweep points, i is the number of sweeps, i=0,1,2…N-1.

[0060] Further, the two output signals are preprocessed to obtain the two output signals after preprocessing, including:

[0061] The bandpass filter submodule is used to filter the two output signals of the transformer winding load to be detected according to one or more preset filter frequency bands to obtain the two output signals after filtering;

[0062] The AD acquisition submodule is used to perform AD conversion on the filtered output signal to obtain two digital output signals.

[0063] Furthermore, preprocessing the two output signals further includes:

[0064] The host computer instruction includes filtering control information;

[0065] Determine whether to perform bandpass filtering according to the filtering control information; if it is determined not to perform bandpass filtering, replace the filtered two-way output signals with the original two-way output signals.

[0066] Further, judging whether the acquisition range of the search output signal needs to be adjusted according to a preset judgment method;

[0067] The preset judgment method includes comparing the signal peak value of the currently collected output signal with the current range. If the signal peak value is within the preset proportion range of the current range, no range adjustment is required; if the signal peak value is higher than the preset proportion range of the current range, the range is increased according to the preset proportion; if the signal peak value is lower than the preset proportion range of the current range, the range is decreased according to the preset proportion.

[0068] Furthermore, the detection parameters include amplitude-frequency parameters and phase-frequency parameters;

[0069] The calculation formula of the amplitude-frequency parameter H is:

[0070] H=20lg(V2 / V1)

[0071] The calculation formula of the phase-frequency parameter C is:

[0072] C=θ2-θ1

[0073] Among them, H is the amplitude-frequency parameter; V1 is the peak-to-peak value of the waveform collected by the first channel; V2 is the peak-to-peak value of the waveform collected by the second channel; C is the phase-frequency parameter; θ1 is the initial phase of the waveform collected by the first channel; θ2 is the initial phase of the waveform collected by the second channel.

[0074] Furthermore, the detection parameters calculated by the signal calculation module and the current frequency are stored in association;

[0075] Determine whether the frequency sweep process is finished according to the current frequency and the frequency sweep cut-off frequency; when it is determined that the frequency sweep process is finished, upload the multiple groups of detection parameters stored in the storage module to the host computer control unit;

[0076] A process instruction is generated after each set of detection parameters is calculated; when the frequency sweep process is not completed, the process instruction includes the current frequency value; when the frequency sweep process is completed, the process instruction is a preset process instruction representing the completion of the frequency sweep.

[0077] The beneficial effects of the present invention are as follows: the technical solution of the present invention provides a wireless communication transformer winding deformation frequency response method detection operation system and method, the system and method realize the interaction between the on-site detection device and the host computer control unit through a wireless network, sink the detection operation to the hardware detection circuit, so that signal acquisition, data processing and calculation are all realized on-site; the system and method avoid long-distance wiring, avoid the problems of low detection accuracy and consistency, and low detection efficiency in the prior art, and at the same time can form an edge computing network consisting of a host computer and multiple slave computers, greatly expanding the detection range. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0079] Figure 1 It is a structural diagram of a transformer winding deformation frequency response method detection operation system for wireless communication according to a specific embodiment of the present invention;

[0080] Figure 2 The present invention is a flowchart of a method for detecting transformer winding deformation using a frequency response method for wireless communication according to a specific implementation of the present invention. DETAILED DESCRIPTION

[0081] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0082] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0083] Figure 1 FIG. 1 is a structural diagram of a transformer winding deformation frequency response method detection operation system for wireless communication according to a specific embodiment of the present invention; Figure 1 As shown, the system comprises:

[0084] A host computer control unit 110 and a lower computer detection unit 120; the host computer control unit 110 includes a host computer instruction module 111 and a host computer wireless communication module 112; the lower computer detection unit 120 includes a lower computer wireless communication module 121, a sweep signal generating module 122, a signal processing module 123 and a signal calculation module 124;

[0085] In order to avoid the problem of signal attenuation and distortion caused by excessive signal wired transmission distance, the accuracy of the signal is ensured by wireless communication between the upper computer and the lower computer. In this embodiment, the detection unit 120 of the lower computer is connected to the transformer winding load to be detected, and information exchange is realized with the upper computer through wireless communication, thereby solving the detection accuracy problem of the prior art.

[0086] The host computer instruction module 111 is used to receive the user's control request information and convert it into a preset host computer instruction; the host computer instruction unit is connected to the host computer wireless communication module 112; the host computer instruction module 111 sends the host computer instruction to the lower computer detection unit 120 through the host computer wireless communication module 112; the host computer instruction includes sweep frequency signal information;

[0087] In this embodiment, the frequency sweep signal information includes the signal peak value, the frequency sweep start frequency, the frequency sweep end frequency, the frequency sweep mode and the number of frequency sweep points;

[0088] The host computer instruction also includes filtering control information;

[0089] The instruction format can be:

[0090] VPP=XX,BP=T(F),F1=XXXX.X,F2=XXXX.X,N=XXXX,SM=LIN(LOG)

[0091] in:

[0092] 1) VPP is the peak-to-peak value of the output sinusoidal signal, unit: V, adjustable from 0.5V to 20V, accuracy: 1V;

[0093] 2) F1 is the starting frequency, unit: kHz, adjustable from 0.1kHz to 2000kHz;

[0094] 3) F2 is the cut-off frequency, unit: kHz, adjustable from 0.1kHz to 2000kHz;

[0095] 4) N ​​is the number of frequency sweep points, unit: piece.

[0096] 5) SM is the frequency sweep mode, including linear frequency sweep mode and logarithmic frequency sweep mode. SM=LIN is linear frequency sweep, and SM=LOG is logarithmic frequency sweep.

[0097] 6) BP is the bandpass filter function. If BP=T, the bandpass filter is turned on. If BP=F, the bandpass filter is turned off. The default setting is off.

[0098] The signal peak value, sweep start frequency, sweep mode and sweep cutoff frequency are determined by receiving control requirement information determined by the user within the corresponding preset parameter range, that is, the user can only input parameters within the preset range to generate host computer instructions.

[0099] The host computer instruction module 111 is used to determine the frequency array according to the frequency sweep start frequency, frequency sweep end frequency, frequency sweep mode and frequency sweep point number;

[0100] The frequency sweep signal generating module 122 generates frequency sweep signals in sequence according to the frequency values ​​in the frequency array;

[0101] When the frequency sweep mode is a linear frequency sweep mode, the frequency array is calculated as follows:

[0102]

[0103] When the frequency sweep mode is a logarithmic frequency sweep mode, the frequency array is calculated as follows:

[0104]

[0105] Wherein, f2 is the sweep cutoff frequency, f1 is the sweep start frequency, N is the number of sweep points, i is the number of sweeps, i=0,1,2…N-1.

[0106] For example: f1=1, f2=10, N=10, the linear sweep frequency array is: (1, 2, 3, 4, 5, 6, 7, 8, 9, 10) kHz; the logarithmic sweep frequency array is: (1, 1.3, 1.7, 2.2, 2.8, 3.6, 4.6, 6.0, 7.7, 10.0) kHz.

[0107] The upper computer wireless communication module 112 and the lower computer wireless communication module 121 are used to establish a communication channel for data transmission through a preset wireless communication protocol;

[0108] The output end of the frequency sweep signal generating module 122 is connected to the input end of the transformer winding load to be detected; the input end of the signal processing module 123 is connected to the output end of the transformer winding load to be detected;

[0109] The sweep frequency signal generating module 122 obtains the sweep frequency signal information in the upper computer instruction through the lower computer wireless communication module 121, generates a sweep frequency signal according to the sweep frequency signal information, and outputs the sweep frequency signal to the transformer winding load;

[0110] In this embodiment, the frequency sweep signal generating module 122 is used to generate a sine frequency sweep signal at each frequency point according to the frequency array, and send the signal into the load network. The parameters of the sine signal are: frequency range 100Hz-2MHz; frequency sweep step length 500Hz, the accuracy of each frequency point should be no more than 0.01%; no-load voltage peak-to-peak value: 1Vpp~20Vpp adjustable, step length 1Vpp, the absolute error between the peak-to-peak value of the voltage at each frequency point and the preset value is no more than 1% of the preset voltage peak-to-peak value; output impedance 50Ω.

[0111] The signal processing module 123 has two input terminals, which are respectively connected to the two output terminals of the transformer winding load to be detected;

[0112] The signal processing module 123 is used to pre-process the two output signals of the transformer winding load to be detected according to a preset rule, and transmit the two output signals after pre-processing to the input end of the signal calculation module;

[0113] In this embodiment, the signal processing module 123 includes a bandpass filtering submodule 1231 and an AD acquisition submodule 1232;

[0114] The bandpass filtering submodule 1231 is used to filter the two output signals of the transformer winding load to be detected according to one or more preset filtering frequency bands to obtain the two output signals after filtering;

[0115] The AD acquisition submodule 1232 is used to perform AD conversion on the filtered output signal to obtain two digital output signals.

[0116] In this embodiment, the main parameters of the AD acquisition submodule 1232 may be:

[0117] 1) The sampling rate can be adjusted automatically between 1MS / s and 20MS / s.

[0118] 2) Resolution: 12bit.

[0119] 3) Sampling storage depth: 1kHz~2MHz sinusoidal signal single sampling 4 cycles.

[0120] 4) Trigger mode: No trigger, automatic acquisition after receiving instructions.

[0121] 5) Coupling mode: AC.

[0122] Furthermore, the host computer instruction includes filtering control information; the bandpass filtering submodule 1231 is used to determine whether to perform bandpass filtering according to the filtering control information; if it is determined not to perform bandpass filtering, the original two-way output signal is transmitted to the AD acquisition submodule 1232.

[0123] As shown in the above example, BP is the bandpass filter function. If BP=T, the bandpass filter is turned on, and if BP=F, the bandpass filter is turned off. The default setting is off.

[0124] Furthermore, the signal processing module 123 also includes a range adjustment submodule 1233;

[0125] The range adjustment submodule 1233 is used to determine whether the acquisition range of the search output signal needs to be adjusted according to a preset judgment method;

[0126] The preset judgment method includes comparing the signal peak value of the currently collected output signal with the current range. If the signal peak value is within the preset proportion range of the current range, no range adjustment is required; if the signal peak value is higher than the preset proportion range of the current range, the range is increased according to the preset proportion; if the signal peak value is lower than the preset proportion range of the current range, the range is decreased according to the preset proportion.

[0127] The signal calculation module 124 is used to calculate the detection parameters according to the two input signals and the preset rules, and upload the detection parameters to the upper computer control unit 110 through the lower computer wireless communication module 121;

[0128] The signal calculation module 124 calculates the detection parameters including amplitude-frequency parameters and phase-frequency parameters;

[0129] The calculation formula of the amplitude-frequency parameter H is:

[0130] H=20lg(V2 / V1)

[0131] The calculation formula of the phase-frequency parameter C is:

[0132] C=θ2-θ1

[0133] Among them, H is the amplitude-frequency parameter; V1 is the peak-to-peak value of the waveform collected by the first channel; V2 is the peak-to-peak value of the waveform collected by the second channel; C is the phase-frequency parameter; θ1 is the initial phase of the waveform collected by the first channel; θ2 is the initial phase of the waveform collected by the second channel.

[0134] The host computer control unit 110 is used to analyze the detection parameters according to a preset analysis method to obtain the transformer winding deformation detection result.

[0135] Furthermore, the lower computer detection unit 120 also includes a storage module 125 and a process control module 126;

[0136] The storage module 125 is used to associate and store the detection parameters and the current frequency calculated by the signal calculation module 124;

[0137] The process control module 126 is used to determine whether the frequency sweep process is completed according to the current frequency and the frequency sweep cut-off frequency; when it is determined that the frequency sweep process is completed, the multiple groups of detection parameters stored in the storage module 125 are uploaded to the host computer control unit 110;

[0138] The process control module 126 is used to generate a process instruction after calculating each set of detection parameters; when the frequency sweep process is not completed, the process instruction includes the current frequency value; when the frequency sweep process is completed, the process instruction is a preset process instruction representing the completion of the frequency sweep;

[0139] In this embodiment, the process instructions may be of three types:

[0140] 1) None. The lower computer executes the process normally

[0141] 2) STOP=F. The lower computer uploads the current frequency, and the upload format is F=XXXX.X

[0142] 3) STOP = T. The frequency sweep process ends and the lower computer enters sleep mode;

[0143] In this embodiment, after determining that the cut-off frequency is reached, the host computer control unit 110 receives a process instruction representing the end of the frequency sweep and then receives multiple groups of inspection parameters. Specifically:

[0144] Upload the H and C of each frequency point stored in the memory to the host computer, and clear the memory after uploading. The upload command is: READ BUFFER, and the data format uploaded by the lower computer is H1, H2, H3...Hn; C1, C2, C3...Cn; -T(F) (H1, H2, H3...Hn is the amplitude-frequency calculation result of each frequency point. C1, C2, C3...Cn is the phase-frequency calculation result of each frequency point. -T(F) is the check code. If the signal of each frequency point does not exceed the maximum range, the check code is T; if some frequency point signals exceed the maximum range, the check code is F). If the frequency sweep process is not completed, the generation, collection, calculation and storage operations of the next frequency point signal are executed. If the host computer gives: READ BUFFER during this process, empty data is returned.

[0145] Figure 2 This is a flow chart of a method for detecting transformer winding deformation frequency response in wireless communication according to a specific embodiment of the present invention. Figure 2 As shown, the method includes:

[0146] Step 210, receiving the user's control requirement information and generating a host computer instruction; the host computer instruction includes sweep frequency signal information;

[0147] Furthermore, the frequency sweep signal information includes the signal peak value, the frequency sweep start frequency, the frequency sweep end frequency, the frequency sweep mode and the number of frequency sweep points;

[0148] The signal peak value, the frequency sweep start frequency, the frequency sweep mode and the frequency sweep cutoff frequency are determined by receiving control requirement information determined by the user within a corresponding preset parameter range.

[0149] Further, the frequency array is determined according to the frequency sweep start frequency, the frequency sweep end frequency, the frequency sweep mode and the number of frequency sweep points; the frequency sweep mode includes a linear frequency sweep mode and a logarithmic frequency sweep mode;

[0150] Generating frequency sweep signals in sequence according to the frequency values ​​in the frequency array;

[0151] When the frequency sweep mode is a linear frequency sweep mode, the frequency array is calculated as follows:

[0152]

[0153] When the frequency sweep mode is a logarithmic frequency sweep mode, the frequency array is calculated as follows:

[0154]

[0155] Wherein, f2 is the sweep cutoff frequency, f1 is the sweep start frequency, N is the number of sweep points, i is the number of sweeps, i=0,1,2…N-1.

[0156] Step 220, transmitting the host computer instruction to the lower computer detection unit through a wireless communication method; generating a sweep frequency signal according to the sweep frequency signal information of the host computer instruction and outputting it to the transformer winding load;

[0157] Step 230, collecting two output signals of the transformer winding load to be detected, preprocessing the two output signals to obtain the preprocessed two output signals;

[0158] Further, the two output signals are preprocessed to obtain the two output signals after preprocessing, including:

[0159] Filtering the two output signals of the transformer winding load to be detected according to one or more preset filtering frequency bands to obtain two filtered output signals;

[0160] The filtered output signal is subjected to AD conversion to obtain two digital output signals.

[0161] Furthermore, preprocessing the two output signals further includes:

[0162] The host computer instruction includes filtering control information;

[0163] Determine whether to perform bandpass filtering according to the filtering control information; if it is determined not to perform bandpass filtering, replace the filtered two-way output signals with the original two-way output signals.

[0164] Further, judging whether the acquisition range of the search output signal needs to be adjusted according to a preset judgment method;

[0165] The preset judgment method includes comparing the signal peak value of the currently collected output signal with the current range. If the signal peak value is within the preset proportion range of the current range, no range adjustment is required; if the signal peak value is higher than the preset proportion range of the current range, the range is increased according to the preset proportion; if the signal peak value is lower than the preset proportion range of the current range, the range is decreased according to the preset proportion.

[0166] Step 240, calculating and obtaining detection parameters according to the two output signals after the preprocessing and the preset rules;

[0167] Furthermore, the detection parameters include amplitude-frequency parameters and phase-frequency parameters;

[0168] The calculation formula of the amplitude-frequency parameter H is:

[0169] H=20lg(V2 / V1)

[0170] The calculation formula of the phase-frequency parameter C is:

[0171] C=θ2-θ1

[0172] Among them, H is the amplitude-frequency parameter; V1 is the peak-to-peak value of the waveform collected by the first channel; V2 is the peak-to-peak value of the waveform collected by the second channel; C is the phase-frequency parameter; θ1 is the initial phase of the waveform collected by the first channel; θ2 is the initial phase of the waveform collected by the second channel.

[0173] Step 250, uploading the detection parameters to a host computer control unit via a wireless communication method; analyzing the detection parameters according to a preset analysis method to obtain the transformer winding deformation detection result.

[0174] Further, the detection parameter and the current frequency are stored in association;

[0175] Determine whether the frequency sweep process is finished according to the current frequency and the frequency sweep cut-off frequency; when it is determined that the frequency sweep process is finished, upload the stored multiple sets of detection parameters to the host computer control unit;

[0176] A process instruction is generated after each set of detection parameters is calculated; when the frequency sweep process is not completed, the process instruction includes the current frequency value; when the frequency sweep process is completed, the process instruction is a preset process instruction representing the completion of the frequency sweep.

[0177] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present disclosure can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0178] Those skilled in the art will appreciate that the modules in the devices in the embodiments can be adaptively changed and set in one or more devices different from the embodiments. The modules or units or components in the embodiments can be combined into one module or unit or component, and in addition they can be divided into multiple submodules or subunits or subcomponents. Except that at least some of such features and / or processes or units are mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this manner can be combined in any combination. Unless otherwise explicitly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) can be replaced by an alternative feature that provides the same, equivalent or similar purpose. The step numbers involved in this specification are only used to distinguish the steps, and are not used to limit the time or logical relationship between the steps. Unless there is a clear definition in the text, the relationship between the steps includes various possible situations.

[0179] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present disclosure and form different embodiments. For example, any one of the embodiments claimed in the claims can be used in any combination.

[0180] The various component embodiments of the present disclosure can be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. The present disclosure can also be implemented as a device or system program (e.g., computer program and computer program product) for performing a part or all of the methods described herein. Such a program implementing the present disclosure can be stored on a computer-readable medium, or can have the form of one or more signals. Such a signal can be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.

[0181] It should be noted that the above embodiments illustrate rather than limit the present disclosure, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present disclosure may be implemented by means of hardware comprising a number of different elements and by means of a suitably programmed computer. In a unit claim enumerating a number of systems, several of these systems may be embodied by the same item of hardware.

[0182] The above description is only a specific implementation mode of the present disclosure. It should be pointed out that, for ordinary technicians in this field, several improvements, modifications, and deformations can be made without departing from the spirit of the present disclosure. These improvements, modifications, and deformations should be deemed to fall within the scope of protection of this application.

Claims

1. A wireless communication transformer winding deformation frequency response method detection operation system, characterized in that: The system comprises: A host computer control unit and a lower computer detection unit; the host computer control unit includes a host computer instruction module and a host computer wireless communication module; the lower computer detection unit includes a lower computer wireless communication module, a sweep signal generation module, a signal processing module and a signal calculation module; The host computer instruction module is used to receive the user's control requirement information and convert it into a preset host computer instruction; the host computer instruction unit is connected to the host computer wireless communication module; the host computer instruction module sends the host computer instruction to the lower computer detection unit through the host computer wireless communication module; the host computer instruction includes sweep frequency signal information; The upper computer wireless communication module and the lower computer wireless communication module are used to establish a communication channel for data transmission through a preset wireless communication protocol; The output end of the frequency sweep signal generating module is connected to the input end of the transformer winding load to be detected; the input end of the signal processing module is connected to the output end of the transformer winding load to be detected; The sweep frequency signal generating module obtains the sweep frequency signal information in the upper computer instruction through the lower computer wireless communication module, generates a sweep frequency signal according to the sweep frequency signal information, and outputs the sweep frequency signal to the transformer winding load; The signal processing module has two input terminals, which are respectively connected to the two output terminals of the transformer winding load to be detected; The signal processing module is used to pre-process the two output signals of the transformer winding load to be detected according to a preset rule, and transmit the two output signals after pre-processing to the input end of the signal calculation module; The signal calculation module is used to calculate and obtain detection parameters according to two input signals and preset rules, and upload the detection parameters to the upper computer control unit through the lower computer wireless communication module; The host computer control unit is used to analyze the detection parameters according to a preset analysis method to obtain the transformer winding deformation detection result; The frequency sweep signal information includes the signal peak value, frequency sweep start frequency, frequency sweep end frequency, frequency sweep mode and frequency sweep points; The signal peak value, the frequency sweep start frequency, the frequency sweep mode and the frequency sweep cutoff frequency are determined by receiving control requirement information determined by the user within a corresponding preset parameter range; The frequency sweeping mode includes a linear frequency sweeping mode and a logarithmic frequency sweeping mode; The host computer instruction module is used to determine the frequency array according to the frequency sweep start frequency, frequency sweep end frequency, frequency sweep mode and frequency sweep point number; The frequency sweep signal generating module generates the frequency sweep signal in sequence according to the frequency values ​​in the frequency array; When the frequency sweep mode is a linear frequency sweep mode, the frequency array is calculated as follows: When the frequency sweep mode is a logarithmic frequency sweep mode, the frequency array is calculated as follows: Wherein, f2 is the sweep cutoff frequency, f1 is the sweep start frequency, N is the number of sweep points, i is the number of sweeps, i=0,1,2…N-1.

2. The system according to claim 1, characterized in that: The signal processing module includes a bandpass filtering submodule and an AD acquisition submodule; The bandpass filter submodule is used to filter the two output signals of the transformer winding load to be detected according to one or more preset filter frequency bands to obtain the two output signals after filtering; The AD acquisition submodule is used to perform AD conversion on the filtered output signal to obtain two digital output signals.

3. The system according to claim 2, characterized in that: The host computer instruction includes filtering control information; the bandpass filtering submodule is used to determine whether to perform bandpass filtering according to the filtering control information; if it is determined not to perform bandpass filtering, the two output signals of the transformer winding load to be detected are transmitted to the AD acquisition submodule.

4. The system according to claim 2, characterized in that The signal processing module also includes a range adjustment submodule; The range adjustment submodule is used to determine whether the acquisition range of the search output signal needs to be adjusted according to a preset judgment method; The preset judgment method includes comparing the signal peak value of the currently collected output signal with the current range. If the signal peak value is within the preset proportion range of the current range, no range adjustment is required; if the signal peak value is higher than the preset proportion range of the current range, the range is increased according to the preset proportion; if the signal peak value is lower than the preset proportion range of the current range, the range is decreased according to the preset proportion.

5. The system according to claim 1, characterized in that: The signal calculation module calculates the detection parameters including amplitude-frequency parameters and phase-frequency parameters; The calculation formula of the amplitude-frequency parameter H is: H=20lg(V2 / V1) The calculation formula of the phase-frequency parameter C is: C=θ2-θ1 Among them, H is the amplitude-frequency parameter; V1 is the peak-to-peak value of the waveform collected by the first channel; V2 is the peak-to-peak value of the waveform collected by the second channel; C is the phase-frequency parameter; θ1 is the initial phase of the waveform collected by the first channel; θ2 is the initial phase of the waveform collected by the second channel.

6. The system according to claim 1, characterized in that: The lower computer detection unit also includes a storage module and a process control module; The storage module is used to associate and store the detection parameters calculated by the signal calculation module and the current frequency; The process control module is used to determine whether the frequency sweep process is completed according to the current frequency and the frequency sweep cut-off frequency; when it is determined that the frequency sweep process is completed, the multiple groups of detection parameters stored in the storage module are uploaded to the host computer control unit; The process control module is used to generate a process instruction after calculating each set of detection parameters; when the frequency sweep process is not completed, the process instruction includes the current frequency value; when the frequency sweep process is completed, the process instruction is a preset process instruction representing the completion of the frequency sweep; After receiving the process instruction representing the end of the frequency sweep, the host computer control unit receives multiple groups of inspection parameters.

7. A wireless communication transformer winding deformation frequency response method detection calculation method, characterized in that: The method comprises: Receive control request information from the user and generate host computer instructions; the host computer instructions include frequency sweep signal information; The host computer command is transmitted to the lower computer detection unit through a wireless communication method; a sweep frequency signal is generated through the sweep frequency signal information of the host computer command and output to the transformer winding load; Collecting two output signals of the transformer winding load to be detected, preprocessing the two output signals to obtain the two preprocessed output signals; Calculate and obtain detection parameters based on the two output signals after preprocessing and preset rules; Uploading the detection parameters to the host computer control unit through a wireless communication method; analyzing the detection parameters according to a preset analysis method to obtain the transformer winding deformation detection result; The frequency sweep signal information includes the signal peak value, frequency sweep start frequency, frequency sweep end frequency, frequency sweep mode and frequency sweep points; The signal peak value, the frequency sweep start frequency, the frequency sweep mode and the frequency sweep cutoff frequency are determined by receiving control requirement information determined by the user within a corresponding preset parameter range; Determine the frequency array according to the frequency sweep start frequency, frequency sweep end frequency, frequency sweep mode and frequency sweep point number; the frequency sweep mode includes a linear frequency sweep mode and a logarithmic frequency sweep mode; Generating frequency sweep signals in sequence according to the frequency values ​​in the frequency array; When the frequency sweep mode is a linear frequency sweep mode, the frequency array is calculated as follows: When the frequency sweep mode is a logarithmic frequency sweep mode, the frequency array is calculated as follows: Wherein, f2 is the sweep cutoff frequency, f1 is the sweep start frequency, N is the number of sweep points, i is the number of sweeps, i=0,1,2…N-1.

8. The method according to claim 7, characterized in that Preprocessing the two output signals to obtain the two output signals after preprocessing includes: Filtering the two output signals of the transformer winding load to be detected according to one or more preset filtering frequency bands to obtain two filtered output signals; The filtered output signal is subjected to AD conversion to obtain two digital output signals.

9. The method according to claim 8, characterized in that Preprocessing the two output signals also includes: The host computer instruction includes filtering control information; Determine whether to perform bandpass filtering according to the filtering control information; if it is determined not to perform bandpass filtering, replace the two output signals after filtering with the two output signals of the transformer winding load to be detected.

10. The method according to claim 8, characterized in that: Determine whether the acquisition range of the search output signal needs to be adjusted according to a preset judgment method; The preset judgment method includes comparing the signal peak value of the currently collected output signal with the current range. If the signal peak value is within the preset proportion range of the current range, no range adjustment is required; if the signal peak value is higher than the preset proportion range of the current range, the range is increased according to the preset proportion; if the signal peak value is lower than the preset proportion range of the current range, the range is decreased according to the preset proportion.

11. The method according to claim 7, characterized in that: The detection parameters include amplitude-frequency parameters and phase-frequency parameters; The calculation formula of the amplitude-frequency parameter H is: H=20lg(V2 / V1) The calculation formula of the phase-frequency parameter C is: C=θ2-θ1 Among them, H is the amplitude-frequency parameter; V1 is the peak-to-peak value of the waveform collected by the first channel; V2 is the peak-to-peak value of the waveform collected by the second channel; C is the phase-frequency parameter; θ1 is the initial phase of the waveform collected by the first channel; θ2 is the initial phase of the waveform collected by the second channel.

12. The method according to claim 7, characterized in that: The calculated detection parameters and the current frequency are stored in association; Determine whether the frequency sweep process is finished according to the current frequency and the frequency sweep cut-off frequency; when it is determined that the frequency sweep process is finished, upload the stored multiple sets of detection parameters to the host computer control unit; A process instruction is generated after each set of detection parameters is calculated; when the frequency sweep process is not completed, the process instruction includes the current frequency value; when the frequency sweep process is completed, the process instruction is a preset process instruction representing the completion of the frequency sweep.

Images