Mechanical state evaluation method of transformer winding and related device

Abstract

The embodiment of the invention discloses a mechanical state evaluation method of a transformer winding and a related device. The method comprises the following steps: acquiring a first position of a signal generator corresponding to each sampling point in a current scanning period, a second position of a signal receiver, a reflection signal received by the signal receiver and a focus position of each focus; carrying out beam forming processing based on delay summation by using the focus position, the reflected signal under each sampling point, the generator position and the receiver position to obtain focus energy distribution under each sampling point; screening a maximum energy focus under each sampling point according to the focus energy distribution under each sampling point to obtain a maximum energy focus characteristic signal set of the current scanning period; and judging the mechanical state of the winding by using the maximum energy focus feature signal set and the last maximum energy focus feature signal set of the last scanning period. In this way, the mechanical state of the transformer winding can be visually evaluated based on the delay summation beam radar array.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer winding state evaluation, and in particular to a mechanical state evaluation method and related device for a transformer winding. Background Art

[0002] A transformer is a very important device in the power system, responsible for the transmission and distribution of electric energy. One of the main faults of a transformer is the mechanical fault of the winding. Currently, the more mainstream methods for evaluating the mechanical state of the winding include the short-circuit impedance method, the vibration frequency response method, and the vibration detection method. However, the above-mentioned methods all indirectly reflect the mechanical state of the winding through the electrical parameters and mechanical parameters of the transformer, which is not intuitive enough. Summary of the Invention

[0003] The main purpose of the present invention is to provide a mechanical state evaluation method and related device for a transformer winding, which can solve the problem that the existing mechanical state evaluation method is not intuitive enough.

[0004] To achieve the above object, the first aspect of the present invention provides a mechanical state evaluation method for a transformer winding, the method comprising:

[0005] Obtaining a scan data set of each sampling point in the current scan period, the scan data set at least including a first position of a signal generator corresponding to the sampling point, a second position of a signal receiver, a reflected signal received by the signal receiver, and a focal position of each focal point, the reflected signal being an echo of a pulse signal emitted by the signal generator and reflected by the winding of the transformer, and the focal points corresponding one-to-one to the points on the winding of the transformer;

[0006] Performing delay-and-sum beamforming processing using the focal positions, the reflected signals at each sampling point, the generator position, and the receiver position to obtain the focal energy distribution at each sampling point;

[0007] Screening the maximum energy focal points at each sampling point according to the focal energy distribution at each sampling point to obtain a set of maximum energy focal point characteristic signals for the current scan period;

[0008] Comparing the set of maximum energy focal point characteristic signals with the set of previous maximum energy focal point characteristic signals of the previous scan period to determine the mechanical state of the winding, the mechanical state being used to reflect whether the winding is deformed.

[0009] In a feasible implementation manner, the performing delay-and-sum beamforming processing using the focal positions, the reflected signals at each sampling point, the generator position, and the receiver position to obtain the focal energy distribution at each sampling point includes:

[0010] Perform time alignment processing using the focal position, the generator position and the receiver position at each sampling point, and a preset time delay algorithm to obtain the time delay of the sampling point;

[0011] According to the time delay, the reflection signals at each sampling point, and a preset focal energy algorithm, obtain a focal energy matrix at each sampling point, and the focal energy distribution includes the focal energy matrix.

[0012] In a feasible implementation manner, the maximum energy focal point feature signal set at least includes a first distance between the maximum energy focal point and the transmitter, a second distance between the maximum energy focal point and the receiver, and the maximum reflection energy corresponding to the maximum energy focal point. Then, comparing the maximum energy focal point feature signal set with the previous maximum energy focal point feature signal set in the previous scan cycle to determine the mechanical state of the winding includes:

[0013] If the percentage change of any one of the first distance, the second distance, or the maximum reflection energy corresponding to each sampling point in the current scan cycle compared to any one of the first distance, the second distance, or the maximum reflection energy corresponding to each sampling point in the previous scan cycle is higher than a preset first percentage threshold, mark the maximum energy focal point as a suspicious point of winding deformation; or,

[0014] If the sum of the percentage changes of the first distance, the second distance, and the maximum reflection energy corresponding to each sampling point in the current scan cycle compared to the first distance, the second distance, and the maximum reflection energy corresponding to each sampling point in the previous scan cycle is higher than a preset second percentage threshold, mark the maximum energy focal point as a suspicious point of winding deformation;

[0015] When the number of suspicious points of winding deformation in the current scan cycle is greater than or equal to a preset number threshold, determine that the mechanical state of the winding is a deformed state.

[0016] In a feasible implementation manner, the pulse signal includes a UWB short pulse wave. Then, obtaining the scan data set at each sampling point in the current scan cycle at least includes:

[0017] Using the size data of the transformer to calculate the estimated time for the UWB short pulse wave to be reflected by the transformer winding;

[0018] Determine the time window for data acquisition according to the estimated time;

[0019] Collect the reflection signals within the time window to obtain the reflection signals at each sampling point.

[0020] In a feasible implementation manner, the time delay algorithm includes the following mathematical expression:

[0021]

[0022] where n i (r o ) is the time delay of the sampling point i relative to the focal position r o , Δt is the sampling interval, r iT is the generator position of the sampling point i, r iR is the receiver position of the sampling point i, r o is the focal position, and c is the speed of light.

[0023] In a feasible implementation, the focal energy algorithm includes the following mathematical expression:

[0024]

[0025] where is the focal energy matrix of the sampling point i, L is the moving distance of the radar generator in one scanning period, M is the total number of sampling points, y i is the UWB short pulse wave signal collected by the radar signal receiver at the sampling point i, is the time delay of the sampling point i relative to the focal position r o .

[0026] To achieve the above object, a second aspect of the present invention provides a mechanical state evaluation device for a transformer winding, and the device includes:

[0027] Data acquisition module: used to acquire the scanning data sets of each sampling point in the current scanning period, and the scanning data sets at least include the first position of the signal generator corresponding to the sampling point, the second position of the signal receiver, the reflected signal received by the signal receiver, and the focal positions of each focal point. The reflected signal is the echo of the pulse signal emitted by the signal generator and reflected by the winding of the transformer, and the focal points correspond one-to-one with the points on the winding of the transformer;

[0028] Energy determination module: used to perform delay-sum beamforming processing based on the focal position, the reflected signals at each sampling point, the generator position, and the receiver position to obtain the focal energy distribution at each sampling point;

[0029] Energy screening module: used to screen the maximum energy focal points at each sampling point according to the focal energy distribution at each sampling point to obtain the maximum energy focal point characteristic signal set of the current scanning period;

[0030] The state judgment module is configured to compare the maximum energy focus feature signal set with the previous maximum energy focus feature signal set in the previous scanning period to judge the mechanical state of the winding, and the mechanical state is used to reflect whether the winding is deformed.

[0031] To achieve the above object, a third aspect of the present invention provides a mechanical state evaluation system for a transformer winding. The system includes a radar module and a main control device. The radar module includes a radar signal generator and a radar signal receiver. Both the radar signal generator and the radar signal receiver are installed on the transformer, and there is a communication connection between both the radar signal generator and the radar signal receiver and the main control device;

[0032] The main control device is configured to drive the radar signal generator to emit a pulse signal to scan the winding of the transformer; and obtain the reflected signal of the pulse signal received by the radar signal receiver; the main control device is further configured to execute the steps as shown in the first aspect and any feasible implementation manner.

[0033] To achieve the above object, a fourth aspect 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 processor is caused to execute the steps as shown in the first aspect and any feasible implementation manner.

[0034] To achieve the above object, a fifth aspect of the present invention provides a computer device including a memory and a processor. The memory stores a computer program, and when the computer program is executed by the processor, the processor is caused to execute the steps as shown in the first aspect and any feasible implementation manner.

[0035] Adopting the embodiments of the present invention has the following beneficial effects:

[0036] The present invention provides a method for evaluating the mechanical state of a transformer winding. The method includes: obtaining a scan data set of each sampling point in the current scan cycle. The scan data set at least includes the first position of the signal generator corresponding to the sampling point, the second position of the signal receiver, the reflected signal received by the signal receiver, and the focal positions of each focus. The reflected signal is the echo of the pulse signal emitted by the signal generator and reflected by the winding of the transformer. The foci are in one-to-one correspondence with the points on the winding of the transformer; performing delay-sum beamforming processing using the focal positions, the reflected signals at each sampling point, the generator position, and the receiver position to obtain the focal energy distribution at each sampling point; screening the maximum energy foci at each sampling point according to the focal energy distribution at each sampling point to obtain the maximum energy focus characteristic signal set of the current scan cycle; comparing the maximum energy focus characteristic signal set with the previous maximum energy focus characteristic signal set of the previous scan cycle to determine the mechanical state of the winding. The mechanical state is used to reflect whether the winding is deformed. Through the above method, the mechanical state of the transformer winding can be intuitively evaluated based on a delay-sum beam radar array. Description of the Drawings

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0038] Among them:

[0039] Figure 1 is an application environment diagram of a method for evaluating the mechanical state of a transformer winding in an embodiment of the present invention;

[0040] Figure 2 is a flowchart of a method for evaluating the mechanical state of a transformer winding in an embodiment of the present invention;

[0041] Figure 3 is a structural block diagram of a device for evaluating the mechanical state of a transformer winding in an embodiment of the present invention;

[0042] Figure 4 is a structural block diagram of a computer device in an embodiment of the present invention. Detailed Embodiments

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] Please refer to Figure 1 , Figure 1 which is an application environment diagram of a method for evaluating the mechanical state of a transformer winding in an embodiment of the present invention. The method shown in this application is applied to a mechanical state evaluation system 100 of a transformer winding. The system includes a radar module and a main control device. Among them, the radar module is installed on the transformer, specifically on the surface of the transformer oil tank 101, and is disposed opposite to each phase winding of the transformer. The radar module includes a radar signal generator 102 and a radar signal receiver 103. Both the radar signal generator and the radar signal receiver are installed on the transformer, and a guide rail 104 is provided for each generator so that the generator can move along the guide rail. The moving direction can be the direction from top to bottom along the winding. Among them, an insulation detection window 105 can be opened at the position where each phase winding faces the surface of the oil tank 101. The radar module is arranged on the transformer according to this window. Specifically, on the transformer oil tank, a rectangular part is cut out at the position facing the winding, and it is filled with a non-conductive insulating material to form an insulation detection window. A guide rail is arranged behind the insulation detection window, and a radar signal generator is installed on the guide rail, and a radar signal receiver is installed at the middle position of the insulation window. It can be understood that for a three-phase transformer, three insulation detection windows are formed in total, and three sets of radar modules (radar signal transceiver devices) are installed to form a radar array, which can simultaneously detect the mechanical states of the three-phase windings.

[0045] Furthermore, there is a communication connection between both the radar signal generator and the radar signal receiver and the main control device; the main control device is used to drive the radar signal generator to emit pulse signals to scan the windings of the transformer; and obtain the reflected signals of the pulse signals received by the radar signal receiver; the main control device is also used to execute the steps of the method shown in this application to achieve the evaluation of the mechanical state of the windings. Among them, the main control device can be a terminal or a server. The terminal can specifically be a desktop terminal or a mobile terminal, and the mobile terminal can specifically be at least one of a mobile phone, a tablet computer, a notebook computer, etc. The server can be implemented by an independent server or a server cluster composed of multiple servers. In this embodiment, the terminal is taken as an example for illustration.

[0046] Exemplarily, the radar module may be a UWB radar. Among them, the radar signal generator 102 is used to emit a UWB short pulse wave of a specific frequency, and the radar signal receiver 103 is used to receive the echo (i.e., the reflected signal) of the UWB short pulse wave.

[0047] Among them, the generator generates a UWB short pulse wave of a specific frequency and propagates in the environment. When the transmitted signal reaches the target (such as the winding or the inner wall of the fuel tank), a small part of its energy will be reflected back to the receiver. The received signal includes a UWB short pulse corresponding to a specific frequency, and its delay is proportional to the distance between the transmitter, the target, and the receiver. In the radar array, the UWB short pulse waves generated by the three signal generators have different frequencies, so the corresponding signal receivers only collect the corresponding specific frequencies to avoid signal interference between the radar arrays.

[0048] Furthermore, the main control device will record data: the signal generator moves along the guide rail and emits pulse signals every time it moves a certain distance. It is required to set the emission interval according to the center distance between each turn of the transformer winding. The distance interval for emitting pulse signals is not greater than 1 / n of the center distance between each turn of the winding (the measurement points for each turn of the winding are n), and n should be greater than or equal to 4 to ensure that each turn of the winding is scanned. The bandwidth of the transmitted pulse is the same as the distance interval for emitting pulse signals. Then the total number of signal emission points and sampling points is both M.

[0049] In this way, the scan data sets of each sampling point in each scan cycle can be obtained through the recorded data, and the method shown in this application can be executed to implement a method for evaluating the mechanical state of a transformer winding based on a delay-sum beam radar array. For the method shown in this application, please refer to the following content.

[0050] Please refer to Figure 2 , Figure 2 which is a flowchart of a method for evaluating the mechanical state of a transformer winding in an embodiment of the present invention. As Figure 2 shown, the method includes the following steps:

[0051] 201. Obtain the scan data sets of each sampling point in the current scan cycle. The scan data sets at least include the first position of the signal generator corresponding to the sampling point, the second position of the signal receiver, the reflected signal received by the signal receiver, and the focus positions of each focus. The reflected signal is the echo of the pulse signal emitted by the signal generator and reflected by the winding of the transformer. The focus corresponds one-to-one with the point on the winding of the transformer;

[0052] It can be understood that the scanning of the winding by the pulse signal of the radar is carried out in real time according to the scanning period. Therefore, the present application can judge the current mechanical state of the winding in real time and online. Specifically, by obtaining the scanning data sets of each sampling point in the current scanning period, where the scanning data set at least includes the first position of the signal generator corresponding to the sampling point, the second position of the signal receiver, the reflected signal received by the signal receiver, and the focal positions of each focus. The reflected signal is the echo of the pulse signal emitted by the signal generator and reflected by the winding of the transformer, and the focus corresponds one-to-one with the point on the winding of the transformer. Among them, different scanning data sets can be obtained according to different sampling points in one scanning period to analyze the mechanical state of the winding.

[0053] In a feasible implementation manner, the pulse signal includes UWB short pulse waves. Then, obtaining the scanning data sets of each sampling point in the current scanning period at least includes the following steps A01 to A03:

[0054] A01. Using the size data of the transformer, calculate the estimated time for the UWB short pulse wave to be reflected by the transformer winding;

[0055] A02. Determine the time window for data acquisition according to the estimated time;

[0056] A03. Collect the reflected signals within the time window to obtain the reflected signals of each sampling point.

[0057] It should be noted that when the pulse signal encounters an obstacle, it will be reflected and received by the receiver. Therefore, the reflected signal may be reflected by the winding or other obstacles. In order to obtain an accurate scanning data set, at least the reflected signal needs to be screened to remove the reflected signals other than those reflected by the winding, including but not limited to the reflected signals on the inner wall of the fuel tank. Therefore, signal preprocessing needs to be performed on the reflected signal, specifically as follows:

[0058] In addition to being reflected by the winding, the UWB short pulse wave signal emitted by the signal generator will also be reflected by the transformer fuel tank wall and finally received by the receiver. However, the size of the high-voltage transformer is about meters, and there is a large path difference between the signals reflected by the fuel tank wall and the winding, and the time difference for the signals to be reflected to the receiver is relatively large. Therefore, through the transformer size data, the approximate time for the UWB short pulse wave to be reflected by the winding can be calculated in advance, and a suitable data time window can be selected. By only collecting the reflected signals within the time window, the reflection of the winding can be distinguished from the fuel tank reflection and extracted.

[0059] 202. Perform delay-sum beamforming processing using the focal positions, the reflected signals at each sampling point, the generator position, and the receiver position to obtain the focal energy distribution at each sampling point;

[0060] Further, based on the delay-and-sum beamforming method, the energy of the UWB short pulse wave collected by the signal receiver is used to form a reflected signal focus energy matrix based on the energy distribution. The delay-and-sum beamforming process can be performed using the focus position, the reflected signals at each sampling point, the generator position, and the receiver position to obtain the focus energy distribution at each sampling point. Among them, step 202 includes steps B01 to B02:

[0061] B01. Perform time alignment processing using the focus position, the generator positions at each sampling point, the receiver position, and a preset time delay algorithm to obtain the time delay of the sampling point;

[0062] It should be noted that the received signals have different time delays because the paths between the signal transmitter and each focus (the point where there is reflected energy when the signal receiver samples each time) are different. Therefore, each received and preprocessed signal must be time-aligned relative to each focus. The time shift required to align the signal relative to each focus (at position r0) is given by the following equation (1):

[0063] Exemplarily, the time delay algorithm includes the following mathematical expression:

[0064]

[0065] In the formula, formula (1) can be regarded as the time delay algorithm, n i (r o ) is the time delay of sampling point i relative to the focus position r o , Δt is the sampling interval, r iT is the generator position of sampling point i, r iR is the receiver position of sampling point i, r o is the focus position, c is the speed of light, represents rounding down, that is, rounding to the largest integer less than x, ||x|| represents the Euclidean norm, c is the approximate speed of microwave propagation in vacuum, usually taking the speed of light, △t is the sampling interval, r iT , r iR are the positions of the signal generator and the signal receiver respectively.

[0066] B02. According to the time delay, the reflected signals at each sampling point, and a preset focus energy algorithm, obtain the focus energy matrix at each sampling point, and the focus energy distribution includes the focus energy matrix.

[0067] Further, after time alignment, the signals are coherently processed, and the energy distribution of each focus is calculated by integrating the signals obtained by summing the time-aligned signals, forming a reflection signal focus energy matrix, which represents the magnitude of the reflection energy corresponding to each focus. The focus energy calculation refers to the following formula (2):

[0068]

[0069] In formula (2), formula (2) can be regarded as a focus energy algorithm, is the focus energy matrix of sampling point i, L is the moving distance of the radar generator in one scanning period, M is the total number of sampling points, and y i is the UWB short pulse wave signal collected by the radar signal receiver at sampling point i, is the time delay of sampling point i relative to the focus position r o Among them, y i is the UWB short pulse wave signal collected by the receiver at each sampling point, is the time delay for alignment calculation, i represents the directory number of the signal generator and signal receiver measurement points, M is the total number of measurement points, and L is the moving distance in one scanning period.

[0070] 203. Screen the maximum energy focus under each sampling point according to the focus energy distribution under each sampling point to obtain the maximum energy focus characteristic signal set of the current scanning period;

[0071] Further, based on the focus energy distribution, further screening is performed to screen the maximum energy focus under each sampling point to obtain the maximum energy focus characteristic signal set of the current scanning period.

[0072] First, based on the reflection signal focus energy matrix, screen the maximum energy focus of the reflection signal at each sampling point of the signal receiver, as shown in formula (3):

[0073]

[0074] Second, supplement the coordinate information of the maximum energy focus of the reflection signal to form the maximum energy focus characteristic signal set [I max of a certain scanning process:

[0075]

[0076] Through this set, it can characterize the distances of the maximum energy focus from the transmitter and receiver at each signal sampling point during one scan, as well as the magnitude of the reflection energy of the UWB short pulse wave signal. That is, the maximum energy focus characteristic signal set [I max at least includes the first distance between the maximum energy focus of sampling point i and the transmitter The second distance between the maximum energy focus and the receiver and the maximum reflected energy I corresponding to the maximum energy focus imax .

[0077] 204. Compare the set of maximum energy focus characteristic signals with the set of previous maximum energy focus characteristic signals in the previous scan cycle to determine the mechanical state of the winding, where the mechanical state is used to reflect whether the winding is deformed.

[0078] Furthermore, by comparing the characteristic information of the maximum energy focus of each reflection signal in a certain scan and the previous scan, it is possible to determine whether the winding is deformed. During real-time judgment, that is, by comparing the characteristic information of the maximum energy focus of each reflection signal in the current scan and the previous scan, it is possible to determine whether the winding is currently deformed.

[0079] Among them, the comparing the set of maximum energy focus characteristic signals with the set of previous maximum energy focus characteristic signals in the previous scan cycle to determine the mechanical state of the winding includes steps C01, C02 and C03:

[0080] C01. If the percentage change of any one of the first distance, the second distance or the maximum reflected energy corresponding to each sampling point in the current scan cycle compared to any one of the first distance, the second distance or the maximum reflected energy corresponding to each sampling point in the previous scan cycle is higher than a preset first percentage threshold, then mark the maximum energy focus as a suspicious point of winding deformation; or

[0081] C02. If the sum of the percentage changes of the first distance, the second distance and the maximum reflected energy corresponding to each sampling point in the current scan cycle compared to the first distance, the second distance and the maximum reflected energy corresponding to each sampling point in the previous scan cycle is higher than a preset second percentage threshold, then mark the maximum energy focus as a suspicious point of winding deformation;

[0082] C03. When the number of suspicious points of winding deformation in the current scan cycle is greater than or equal to a preset number threshold, then determine the mechanical state of the winding as a deformed state.

[0083] Exemplarily, the preset first percentage threshold can be 10%, the preset second percentage threshold can be 15%, and the preset number threshold can be n. If in a certain scan and the previous scan I imax the percentage change of a certain item exceeds 10%, or I imax the sum of the percentage changes of the three items exceeds 15%, then count this point as a suspicious point of winding deformation.

[0084] If the number of suspicious points of winding deformation in a certain scan is greater than or equal to n, it can be determined that the winding deformation has occurred in one turn or more turns of the winding, and the winding deformation of the main transformer has been determined.

[0085] The present invention provides a method for evaluating the mechanical state of a transformer winding. The method includes: obtaining a scan data set of each sampling point in the current scan period, where the scan data set at least includes the first position of the signal generator corresponding to the sampling point, the second position of the signal receiver, the reflected signal received by the signal receiver, and the focal position of each focal point. The reflected signal is the echo of the pulse signal emitted by the signal generator and reflected by the winding of the transformer, and the focal points correspond one-to-one with the points on the winding of the transformer; performing delay-sum beamforming processing using the focal position, the reflected signal at each sampling point, the generator position, and the receiver position to obtain the focal energy distribution at each sampling point; screening the maximum energy focal point at each sampling point according to the focal energy distribution at each sampling point to obtain the maximum energy focal point characteristic signal set of the current scan period; comparing the maximum energy focal point characteristic signal set and the previous maximum energy focal point characteristic signal set of the previous scan period to judge the mechanical state of the winding, and the mechanical state is used to reflect whether the winding is deformed. Through the above method, the mechanical state of the transformer winding can be intuitively evaluated based on the delay-sum beam radar array.

[0086] Please refer to Figure 3 , Figure 3 which is the structural block diagram of a device for evaluating the mechanical state of a transformer winding in an embodiment of the present invention. As Figure 3 shown, the device includes:

[0087] A data acquisition module 301: configured to obtain a scan data set of each sampling point in the current scan period. The scan data set at least includes the first position of the signal generator corresponding to the sampling point, the second position of the signal receiver, the reflected signal received by the signal receiver, and the focal position of each focal point. The reflected signal is the echo of the pulse signal emitted by the signal generator and reflected by the winding of the transformer, and the focal points correspond one-to-one with the points on the winding of the transformer;

[0088] An energy determination module 302: configured to perform delay-sum beamforming processing using the focal position, the reflected signal at each sampling point, the generator position, and the receiver position to obtain the focal energy distribution at each sampling point;

[0089] An energy screening module 303: configured to screen the maximum energy focal point at each sampling point according to the focal energy distribution at each sampling point to obtain the maximum energy focal point characteristic signal set of the current scan period;

[0090] State judgment module 304: configured to compare the maximum energy focus feature signal set with the previous maximum energy focus feature signal set in the previous scan period to judge the mechanical state of the winding, where the mechanical state is used to reflect whether the winding is deformed.

[0091] It should be noted that, as Figure 3 shown, the content of each module in the device is similar to Figure 1 the content of each step in the method shown. To avoid repetition, it will not be elaborated here. Specifically, reference can be made to Figure 1 the content of each step in the method shown.

[0092] The present invention provides a device for evaluating the mechanical state of a transformer winding. The device includes: a data acquisition module: configured to acquire a scan data set of each sampling point in the current scan period. The scan data set at least includes the first position of the signal generator corresponding to the sampling point, the second position of the signal receiver, the reflected signal received by the signal receiver, and the focus position of each focus. The reflected signal is the echo of the pulse signal emitted by the signal generator and reflected by the winding of the transformer. The focus corresponds one-to-one with the point on the winding of the transformer; an energy determination module: configured to perform delay-and-sum beamforming processing using the focus position, the reflected signal at each sampling point, the generator position, and the receiver position to obtain the focus energy distribution at each sampling point; an energy screening module: configured to screen the maximum energy focus at each sampling point according to the focus energy distribution at each sampling point to obtain the maximum energy focus feature signal set in the current scan period; a state judgment module: configured to compare the maximum energy focus feature signal set with the previous maximum energy focus feature signal set in the previous scan period to judge the mechanical state of the winding, where the mechanical state is used to reflect whether the winding is deformed. Through the above method, the mechanical state of the transformer winding can be visually evaluated based on the delay-and-sum beam radar array.

[0093] Figure 4 shows the internal structure diagram of a computer device in an embodiment. The computer device can specifically be a terminal or a server. As Figure 4 shown, the computer device includes a processor, a memory, and a network interface connected through a system bus. Among them, the memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium of the computer device stores an operating system and can also store a computer program. When the computer program is executed by the processor, the processor can implement the above method. The internal memory can also store a computer program. When the computer program is executed by the processor, the processor can execute the above method. Those skilled in the art can understand, Figure 4The structure shown is only a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements.

[0094] In one embodiment, a computer device is provided, including a memory and a processor. The memory stores a computer program. When the computer program is executed by the processor, the processor is caused to execute as Figure 2 the steps shown.

[0095] In one embodiment, a computer-readable storage medium is provided, storing a computer program. When the computer program is executed by a processor, the processor is caused to execute as Figure 2 the steps shown.

[0096] Those of ordinary skill in the art can understand that all or part of the processes of implementing the methods in the above embodiments can be completed by instructing relevant hardware through a computer program. The program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it may include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the various embodiments provided in this application may include non-volatile and / or volatile memories. Non-volatile memories may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memories may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0097] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0098] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A method for evaluating the mechanical state of a transformer winding, characterized in that The method includes: Obtaining a scan data set of each sampling point in the current scan cycle, where the scan data set at least includes the first position of a signal generator corresponding to the sampling point, the second position of a signal receiver, the reflected signal received by the signal receiver, and the focus positions of each focus. The reflected signal is the echo of a pulse signal emitted by the signal generator and reflected by the winding of the transformer, and the focus corresponds one-to-one with the point on the winding of the transformer; Performing delay-sum beamforming processing using the focus positions, the reflected signals at each sampling point, the generator position, and the receiver position to obtain the focus energy distribution at each sampling point; Screening the maximum energy focus at each sampling point according to the focus energy distribution at each sampling point to obtain a set of maximum energy focus characteristic signals for the current scan cycle; Comparing the set of maximum energy focus characteristic signals with the set of previous maximum energy focus characteristic signals in the previous scan cycle to determine the mechanical state of the winding, where the mechanical state is used to reflect whether the winding is deformed.

2. The method according to claim 1, wherein The performing delay-sum beamforming processing using the focus positions, the reflected signals at each sampling point, the generator position, and the receiver position to obtain the focus energy distribution at each sampling point includes: Performing time alignment processing using the focus positions, the generator positions at each sampling point, the receiver positions, and a preset time delay algorithm to obtain the time delay of the sampling point; According to the time delay, the reflected signals at each sampling point, and a preset focus energy algorithm, obtaining a focus energy matrix at each sampling point, where the focus energy distribution includes the focus energy matrix.

3. The method according to claim 1, characterized in that, The set of maximum energy focus characteristic signals at least includes the first distance between the maximum energy focus and the transmitter, the second distance between the maximum energy focus and the receiver, and the maximum reflected energy corresponding to the maximum energy focus. Then, the comparing the set of maximum energy focus characteristic signals with the set of previous maximum energy focus characteristic signals in the previous scan cycle to determine the mechanical state of the winding includes: If the change percentage of any one of the first distance, the second distance, or the maximum reflected energy corresponding to each sampling point in the current scan cycle compared to any one of the first distance, the second distance, or the maximum reflected energy corresponding to each sampling point in the previous scan cycle is higher than a preset first percentage threshold, then marking the maximum energy focus as a suspicious point of winding deformation; or, If the sum of the change percentages of the first distance, the second distance, and the maximum reflected energy corresponding to each sampling point in the current scan cycle compared to the first distance, the second distance, and the maximum reflected energy corresponding to each sampling point in the previous scan cycle is higher than a preset second percentage threshold, then marking the maximum energy focus as a suspicious point of winding deformation; When the number of suspicious points of winding deformation in the current scan cycle is greater than or equal to a preset number threshold, determining the mechanical state of the winding as a deformed state.

4. The method according to any one of claims 1 to 3, characterized in that, If the pulse signal includes UWB short pulse waves, then obtaining the scan data set of each sampling point in the current scan period at least includes: Calculating the estimated time for the UWB short pulse waves to be reflected by the transformer winding using the size data of the transformer; Determining the time window for data acquisition according to the estimated time; Collecting the reflected signals within the time window to obtain the reflected signals of each sampling point.

5. The method according to claim 2, wherein The time delay algorithm includes the following mathematical expression: where n i (r o ) is the time delay of the sampling point i relative to the focal position r o , Δt is the sampling interval, r iT is the generator position of the sampling point i, r iR is the receiver position of the sampling point i, r o is the focal position, and c is the speed of light.

6. The method according to claim 2, wherein The focus energy algorithm includes the following mathematical expression: In the formula, is the focus energy matrix of the sampling point i, L is the moving distance of the radar generator in one scanning period, M is the total number of sampling points, and y i is the UWB short pulse wave signal collected by the radar signal receiver at the sampling point i, is the relative focal position r of the sampling point i o is the time delay.

7. A mechanical state evaluation device for a transformer winding, characterized in that The device includes: A data acquisition module: configured to obtain the scan data set of each sampling point in the current scan period, where the scan data set at least includes the first position of the signal generator corresponding to the sampling point, the second position of the signal receiver, the reflected signal received by the signal receiver, and the focus positions of each focus, the reflected signal being the echo of the pulse signal emitted by the signal generator and reflected by the winding of the transformer, and the focus corresponding one-to-one to the points on the winding of the transformer; An energy determination module: configured to perform delay-sum beamforming processing using the focus positions, the reflected signals at each sampling point, the generator position, and the receiver position to obtain the focus energy distribution at each sampling point; An energy screening module: configured to screen the maximum energy focus at each sampling point according to the focus energy distribution at each sampling point to obtain the maximum energy focus characteristic signal set of the current scan period; A state judgment module: configured to compare the maximum energy focus characteristic signal set with the previous maximum energy focus characteristic signal set of the previous scan period to judge the mechanical state of the winding, where the mechanical state is used to reflect whether the winding is deformed.

8. A mechanical state evaluation system for a transformer winding, characterized in that, The system includes a radar module and a main control device. The radar module includes a radar signal generator and a radar signal receiver. Both the radar signal generator and the radar signal receiver are installed on the transformer, and there is a communication connection between both the radar signal generator and the radar signal receiver and the main control device; The main control device is configured to drive the radar signal generator to emit pulse signals to scan the winding of the transformer; and obtain the reflected signals of the pulse signals received by the radar signal receiver; the main control device is further configured to execute the steps of the method according to any one of claims 1 to 6.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, the processor is caused to execute the steps of the method according to any one of claims 1 to 6.

10. A computer device, comprising a memory and a processor, characterized in that, The memory stores a computer program, and when the computer program is executed by the processor, the processor is caused to execute the steps of the method according to any one of claims 1 to 6.

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