Method, device, equipment, readable storage medium and program product for identifying connection state of current-carrying loop between transformer winding and bushing

Abstract

The application relates to a transformer winding and sleeve inter-circuit connection state recognition method and device, computer equipment, a computer readable storage medium and a computer program product, and relates to the technical field of power systems, and can improve the recognition accuracy of the transformer winding and sleeve inter-circuit connection state. The method comprises the following steps: acquiring a vibration frequency spectrum corresponding to a vibration signal in a preset range of a current-carrying circuit between a transformer winding and a sleeve; determining a plurality of actual center frequencies corresponding to the vibration frequency of the transformer in the vibration frequency spectrum; searching for symmetrical frequencies in a preset search range of each actual center frequency; acquiring a first vibration power of each group of symmetrical frequencies and a second vibration power of the vibration frequency spectrum, and obtaining a vibration power ratio according to the ratio of the first vibration power and the second vibration power; and determining a connection state recognition result of the current-carrying circuit between the transformer winding and the sleeve according to the vibration power ratio.

Description

Technical Field

[0001] This application relates to the field of power system technology, and in particular to a method, apparatus, computer equipment, computer-readable storage medium, and computer program product for identifying the connection status of the current-carrying circuit between transformer windings and bushings. Background Technology

[0002] With the development of power technology, a great deal of research has been conducted on transformer winding mechanical condition detection technology in order to more accurately detect transformer winding faults.

[0003] In related technologies, for faults caused by poor connection of the current-carrying circuit between transformer windings and bushings, a 100Hz / 200Hz amplitude ratio identification method is adopted for fault identification after studying the loosening fault characteristics of the connection area between the transformer winding leads and bushings.

[0004] However, in practical applications, real-time changes in transformer load and harmonic components in voltage and current signals directly affect the amplitude ratio, leading to misjudgments or missed judgments. Therefore, the accuracy of related technologies for identifying the current-carrying circuit connection between transformer windings and bushings still needs improvement. Summary of the Invention

[0005] Based on this, it is necessary to provide a method, apparatus, computer equipment, computer-readable storage medium, and computer program product for identifying the connection status of the current-carrying circuit between transformer windings and bushings, in order to address the above-mentioned technical problems.

[0006] In a first aspect, this application provides a method for identifying the connection status of the current-carrying circuit between a transformer winding and a bushing, including:

[0007] Obtain the vibration spectrum corresponding to the vibration signal within a preset range of the current-carrying circuit between the transformer winding and the bushing;

[0008] In the vibration spectrum, determine a plurality of actual center frequencies corresponding to the vibration frequency of the transformer;

[0009] A symmetrical frequency is searched within a preset search range of each actual center frequency; two frequencies in each group of symmetrical frequencies are respectively on both sides of the actual center frequency, and the difference between each of the two frequencies and the actual center frequency is matched.

[0010] Obtain the first vibration power of each group of symmetrical frequencies and the second vibration power of the vibration spectrum, and obtain the vibration power ratio based on the ratio of the first vibration power to the second vibration power;

[0011] Based on the vibration power ratio, the connection status identification result of the current-carrying circuit between the transformer winding and the bushing is determined.

[0012] In one embodiment, searching for symmetrical frequencies within a preset search range for each actual center frequency includes:

[0013] For each actual center frequency, a preset frequency range is used as the search radius to determine multiple first local extremum frequencies on one side of the actual center frequency and multiple second local extremum frequencies on the other side.

[0014] Pair multiple first local extremum point frequencies and multiple second local extremum point frequencies to obtain each pair of first local extremum point frequencies and second local extremum point frequencies.

[0015] The symmetrical frequency is determined based on the first local extremum frequency and the second local extremum frequency of each pair.

[0016] In one embodiment, pairing multiple first local extremum frequency points and multiple second local extremum frequency points to obtain each pair of paired first local extremum frequency points and second local extremum frequency points includes:

[0017] Based on the actual center frequency corresponding to the first local extreme point frequency, determine the desired symmetrical frequency that is symmetrical to the first local extreme point frequency.

[0018] The desired symmetrical frequency is matched with multiple second local extremum frequency, and the successfully matched second local extremum frequency is paired with the first local extremum frequency.

[0019] In one embodiment, determining multiple first local extremum frequencies on one side of the actual center frequency and multiple second local extremum frequencies on the other side, using a preset frequency range as the search radius, includes:

[0020] Using a preset frequency range as the search radius, determine the amplitude of local extreme points located on both sides of the actual center frequency; the amplitude of the local extreme points is greater than or equal to the vibration amplitude corresponding to the frequency within the preset range of the amplitude of the local extreme points.

[0021] Based on the frequencies corresponding to the amplitudes of each local extremum point, multiple first local extremum point frequencies and multiple second local extremum point frequencies on the other side are obtained.

[0022] In one embodiment, determining the symmetrical frequency based on the paired first local extremum frequency and the second local extremum frequency includes:

[0023] Obtain the first average amplitude of the multiple actual center frequencies;

[0024] For each pair of first local extreme point frequencies and second local extreme point frequencies, a second average amplitude of the first local extreme point frequencies and the second local extreme point frequencies is obtained, and when the amplitude ratio of the second average amplitude to the first average amplitude is greater than a preset threshold, the pair of first local extreme point frequencies and second local extreme point frequencies are taken as symmetrical frequencies.

[0025] In one embodiment, determining a plurality of actual center frequencies corresponding to the vibration frequency of the transformer in the vibration spectrum includes:

[0026] In the vibration spectrum, a plurality of preset center frequencies corresponding to the vibration frequency of the transformer are determined;

[0027] The search range for each preset center frequency is determined based on the preset center frequency search tolerance.

[0028] The maximum amplitude of the vibration component within the search range of each preset center frequency is determined, and the frequency corresponding to the maximum amplitude of the vibration component is taken as the actual center frequency.

[0029] Secondly, this application also provides a device for identifying the connection status of the current-carrying circuit between a transformer winding and a bushing, comprising:

[0030] The spectrum acquisition module is used to acquire the vibration spectrum corresponding to the vibration signal within a preset range of the current-carrying circuit between the transformer winding and the bushing.

[0031] The actual center frequency determination module is used to determine multiple actual center frequencies in the vibration spectrum that correspond to the vibration frequency of the transformer.

[0032] The symmetrical frequency determination module is used to search for symmetrical frequencies within a preset search range of each actual center frequency; two frequencies in each group of symmetrical frequencies are respectively on both sides of the actual center frequency, and the difference between each of the two frequencies and the actual center frequency is matched.

[0033] The ratio acquisition module is used to acquire the first vibration power of each group of symmetrical frequencies and the second vibration power of the vibration spectrum, and to obtain the vibration power ratio based on the ratio of the first vibration power to the second vibration power.

[0034] The connection status identification module is used to determine the connection status identification result of the current-carrying circuit between the transformer winding and the bushing based on the vibration power ratio.

[0035] Thirdly, this application also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0036] Obtain the vibration spectrum corresponding to the vibration signal within a preset range of the current-carrying circuit between the transformer winding and the bushing;

[0037] In the vibration spectrum, determine a plurality of actual center frequencies corresponding to the vibration frequency of the transformer;

[0038] A symmetrical frequency is searched within a preset search range of each actual center frequency; two frequencies in each group of symmetrical frequencies are respectively on both sides of the actual center frequency, and the difference between each of the two frequencies and the actual center frequency is matched.

[0039] Obtain the first vibration power of each group of symmetrical frequencies and the second vibration power of the vibration spectrum, and obtain the vibration power ratio based on the ratio of the first vibration power to the second vibration power;

[0040] Based on the vibration power ratio, the connection status identification result of the current-carrying circuit between the transformer winding and the bushing is determined.

[0041] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the following steps:

[0042] Obtain the vibration spectrum corresponding to the vibration signal within a preset range of the current-carrying circuit between the transformer winding and the bushing;

[0043] In the vibration spectrum, determine a plurality of actual center frequencies corresponding to the vibration frequency of the transformer;

[0044] A symmetrical frequency is searched within a preset search range of each actual center frequency; two frequencies in each group of symmetrical frequencies are respectively on both sides of the actual center frequency, and the difference between each of the two frequencies and the actual center frequency is matched.

[0045] Obtain the first vibration power of each group of symmetrical frequencies and the second vibration power of the vibration spectrum, and obtain the vibration power ratio based on the ratio of the first vibration power to the second vibration power;

[0046] Based on the vibration power ratio, the connection status identification result of the current-carrying circuit between the transformer winding and the bushing is determined.

[0047] Fifthly, this application also provides a computer program product, including a computer program that, when executed by a processor, performs the following steps:

[0048] Obtain the vibration spectrum corresponding to the vibration signal within a preset range of the current-carrying circuit between the transformer winding and the bushing;

[0049] In the vibration spectrum, determine a plurality of actual center frequencies corresponding to the vibration frequency of the transformer;

[0050] A symmetrical frequency is searched within a preset search range of each actual center frequency; two frequencies in each group of symmetrical frequencies are respectively on both sides of the actual center frequency, and the difference between each of the two frequencies and the actual center frequency is matched.

[0051] Obtain the first vibration power of each group of symmetrical frequencies and the second vibration power of the vibration spectrum, and obtain the vibration power ratio based on the ratio of the first vibration power to the second vibration power;

[0052] Based on the vibration power ratio, the connection status identification result of the current-carrying circuit between the transformer winding and the bushing is determined.

[0053] The aforementioned method, apparatus, computer equipment, computer-readable storage medium, and computer program product for identifying the connection status of the current-carrying circuit between the transformer winding and the bushing can acquire the vibration spectrum corresponding to the vibration signal within a preset range of the current-carrying circuit between the transformer winding and the bushing. Multiple actual center frequencies corresponding to the transformer's vibration frequency are determined from the vibration spectrum. Symmetrical frequencies are searched within a preset search range of each actual center frequency. Two frequencies in each group of symmetrical frequencies are located on either side of the actual center frequency, and the difference between each frequency and the actual center frequency is matched. Then, the first vibration power of each group of symmetrical frequencies and the second vibration power of the vibration spectrum can be acquired. A vibration power ratio is obtained based on the ratio of the first vibration power to the second vibration power. Finally, the connection status identification result of the current-carrying circuit between the transformer winding and the bushing is determined based on the vibration power ratio. This application theoretically demonstrates that the appearance of symmetrical frequencies on both sides of the main vibration frequency of the transformer is an important characteristic of poor connection of the current-carrying circuit between the transformer winding and the bushing. At the same time, by calculating the first vibration power corresponding to the symmetrical frequency and the second vibration power of the vibration spectrum, the connection status identification result is determined based on their vibration power ratio. This effectively reduces the interference of system operating conditions such as transformer load, harmonics, and DC bias on the identification result, and has stronger robustness. It improves the accuracy and reliability of the identification of the connection status of the current-carrying circuit between the transformer winding and the bushing, and effectively improves the fault identification accuracy. Attached Figure Description

[0054] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0055] Figure 1 This is a flowchart illustrating a method for identifying the connection status of the current-carrying circuit between a transformer winding and a bushing in one embodiment.

[0056] Figure 2 This is a flowchart illustrating another method for identifying the connection status of the current-carrying circuit between a transformer winding and a bushing in one embodiment.

[0057] Figure 3 This is a structural block diagram of a device for identifying the connection status of the current-carrying circuit between a transformer winding and a bushing, as described in one embodiment.

[0058] Figure 4 This is an internal structural diagram of a computer device in one embodiment;

[0059] Figure 5 This is an internal structural diagram of another computer device in one embodiment. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0061] To enable those skilled in the art to better understand this application, the relevant technologies are first introduced below.

[0062] With the development of power technology, extensive research has been conducted on transformer winding mechanical condition detection technology to more accurately detect transformer winding faults. Current research mainly focuses on fault modes such as winding deformation and decreased winding clamping force. Methods include extracting the time-domain waveform envelope of vibration signals, using phase information from the 100Hz vibration component, and obtaining modal frequencies from transient vibration signals during power outages to detect and diagnose overall mechanical conditions such as winding deformation and decreased clamping force.

[0063] For fault modes involving poor connection of the current-carrying circuit between transformer windings and bushings, vibration analysis methods are rarely used for detection and early warning. While some related technologies have conducted experimental tests on simulated fixtures for the electrical connection structure of winding leads, they do not address the detection and early warning of vibration signals.

[0064] In other related technologies, although vibration methods are used to study the loosening fault characteristics of the connection area between the winding lead and the bushing, the main method is to identify loosening faults in the bushing riser area using a fixed amplitude ratio of 100Hz / 200Hz.

[0065] However, in practical applications, real-time changes in transformer load and harmonic components in voltage and current signals directly affect the final calculated amplitude ratio, leading to misjudgments or missed judgments. Furthermore, this method does not fundamentally address the cause of significant changes in transformer tank wall vibration signals due to poor winding lead connections, lacking theoretical support and making it difficult to determine the reliability of the detection results.

[0066] Based on this, it is necessary to provide a method, apparatus, computer equipment, computer-readable storage medium, and computer program product for identifying the connection status of the current-carrying circuit between transformer windings and bushings, in order to address the above-mentioned technical problems.

[0067] In one embodiment, such as Figure 1 As shown, a method for identifying the connection status of the current-carrying circuit between a transformer winding and a bushing is provided. This embodiment illustrates the application of this method to a terminal. It is understood that this method can also be applied to a server, and further to a system including both a terminal and a server, and implemented through interaction between the terminal and the server. In this embodiment, the method includes the following steps:

[0068] S101, obtain the vibration spectrum corresponding to the vibration signal within the preset range of the current-carrying circuit between the transformer winding and the bushing.

[0069] In practical implementation, the vibration dynamics equation of the transformer winding can be expressed as shown in equation (1) below:

[0070] (1)

[0071] Where t is time, m is winding mass, x is winding displacement, c is damping coefficient, k is overall winding stiffness, F is electromagnetic force, and ω0 is electromagnetic force frequency, which can be 50Hz as determined by empirical information.

[0072] From the above equation, it can be seen that the vibration frequency of the winding displacement x will be affected by the electromagnetic force F, and the relationship shown in equation (2) can be obtained:

[0073] (2)

[0074] Where A is the vibration amplitude.

[0075] In practice, it has been found that when the current-carrying circuit between the transformer winding and the bushing is well connected, the current-carrying circuit in this area will vibrate at the same frequency as the winding; when the current-carrying circuit between the winding and the bushing is poorly connected, such as when some connecting parts in the current-carrying circuit are deformed, loosened or slipped, or the connecting bolts are loose, a local periodic contact and separation will occur at the poorly connected part, causing the local stiffness of the current-carrying circuit to change dynamically. At this time, the vibration dynamics equation can be expressed as shown in the following equation (3):

[0076] (3)

[0077] Where Δk represents the dynamic change stiffness amplitude of the loose component in the current-carrying circuit, and Ω represents the periodic contact and separation frequency of the loose component. As can be seen from equation (3), as the loose component periodically contacts and separates, its local stiffness will also periodically increase or decrease.

[0078] At this time, the vibration frequency of the winding displacement x is affected not only by the frequency of the electromagnetic force F, but also by the frequency Ω, as shown in equation (4):

[0079] (4)

[0080] After performing a trigonometric transformation on equation (4), we can obtain equation (5) as shown below:

[0081] (5)

[0082] According to equation (5), at this time, the vibration frequency of displacement x will be superimposed with ±Ω frequency components on the basis of the original main vibration frequency ω0.

[0083] Based on the above theoretical analysis and derivation, this application proposes a method for identifying the connection status of the current-carrying circuit between the transformer winding and the bushing, which can provide early warning of poor connection of the current-carrying circuit between the transformer winding and the bushing based on vibration signals.

[0084] In this step, vibration signals within a preset range of the current-carrying circuit between the transformer winding and the bushing can be collected, and the corresponding vibration spectrum can be obtained based on the collected vibration signals.

[0085] In some exemplary embodiments, vibration sensors can be arranged on the tank wall near the current-carrying circuit between the transformer winding and the bushing, for example, within a preset range of the current-carrying circuit between the transformer winding and the bushing. The vibration signals collected by the sensors are then subjected to a Fast Fourier Transform to obtain the vibration spectrum. In one example, considering frequency resolution accuracy, the vibration signal acquisition time is greater than a time threshold (e.g., not less than 1 second), and the sampling rate is greater than a frequency threshold (e.g., not less than 8 kHz).

[0086] S102, determine multiple actual center frequencies corresponding to the vibration frequency of the transformer in the vibration spectrum.

[0087] In this step, the transformer's vibration frequency can be determined. This frequency can be an empirical value or a measured value. Then, the vibration spectrum can be analyzed to identify multiple actual center frequencies corresponding to the transformer's vibration frequency.

[0088] Among them, the actual center frequency corresponding to the transformer vibration frequency can be the true peak frequency that is searched near the theoretical vibration frequency and dynamically determined by combining the actual signal amplitude distribution.

[0089] S103, search for symmetrical frequencies within a preset search range of each actual center frequency; the two frequencies in each group of symmetrical frequencies are located on either side of the actual center frequency, and the difference between each of the two frequencies and the actual center frequency is matched.

[0090] Among them, the symmetrical frequency includes two frequencies, which are located on both sides of the actual center frequency. That is, there are two frequencies in the symmetrical frequency, one of which is greater than the actual center frequency and the other is less than the actual center frequency. At the same time, the difference between each of the two frequencies and the actual center frequency is matched.

[0091] Specifically, after obtaining multiple actual center frequencies, a preset search range can be determined for each actual center frequency. The preset search range can be understood as a frequency range that includes the corresponding actual center frequency. The preset search ranges are different for different actual center frequencies. The preset search range is the frequency range where symmetrical frequencies may appear. That is, within the preset search range, the symmetrical frequency of the actual center frequency can be searched.

[0092] Furthermore, for each actual center frequency, a preset search range can be established, within which a symmetrical frequency search can be performed. Based on the search results for each actual center frequency within its preset search range, at least one set of symmetrical frequencies can be obtained. In some examples, after determining the preset search range, the amplitudes corresponding to multiple frequencies within the range can be compared, and the symmetrical frequency can be determined based on the amplitude comparison results.

[0093] S104, obtain the first vibration power of each group of symmetrical frequencies and the second vibration power of the vibration spectrum, and obtain the vibration power ratio based on the ratio of the first vibration power to the second vibration power.

[0094] After obtaining the symmetrical frequencies, the vibration power can be calculated based on the amplitudes of multiple sets of symmetrical frequencies, as well as the vibration power based on the amplitudes of each frequency across the entire frequency spectrum. For ease of distinction, the vibration power calculated based on the amplitudes of multiple sets of symmetrical frequencies is referred to as the first vibration power, and the vibration power at the vibration frequency is referred to as the second vibration power. Then, the ratio of the first vibration power to the second vibration power can be obtained and used as the vibration power ratio.

[0095] In one example, taking a vibration spectrum ranging from 1 to 2000 Hz as an example, the vibration power ratio can be calculated according to the following equation (6). :

[0096] (6)

[0097] in, , Let each frequency be an amplitude of a set of symmetrical frequencies. It represents the amplitude corresponding to frequency x on the vibration spectrum.

[0098] S105, based on the vibration power ratio, determine the connection status identification result of the current-carrying circuit between the transformer winding and the bushing.

[0099] After obtaining the vibration power ratio, the connection status of the current-carrying circuit between the transformer winding and the bushing can be determined by comparing this ratio with multiple preset thresholds, thus obtaining the connection status identification result. Based on this method, suitable hardware and software devices can be developed to achieve real-time monitoring and early warning based on the connection status identification result, such as executing the transformer winding and bushing current-carrying circuit connection status identification method provided in this application at preset time intervals.

[0100] By obtaining the vibration power ratio, the characteristic quantity can be transformed from the "absolute amplitude" of the symmetrical frequency into a "relative energy proportion," reducing the sensitivity of the indicator to interferences such as load fluctuations, voltage / current harmonics, and DC bias, and improving the robustness of the subsequent connection status identification results. For example, when the load increases and causes the overall vibration amplitude to double, the power of the symmetrical frequency and the full spectrum increases synchronously, and the ratio remains stable; while during harmonic pollution, the stray frequency energy is dispersed throughout the full spectrum, and the relative power proportion of the symmetrical frequency can still highlight the fault characteristics.

[0101] In some examples, the mechanical condition of the current-carrying circuit connecting the transformer winding leads and bushings can be detected and warned based on the vibration power ratio. Specifically, when 0 ≤ vibration power ratio < first threshold α, it is determined that the connection of the current-carrying circuit connecting the transformer winding leads and bushings is good; when the first threshold α ≤ vibration power ratio ≤ second threshold β, it is determined that the connection condition of the current-carrying circuit connecting the transformer winding leads and bushings has deteriorated; when the vibration power ratio > β, it can be determined that the current-carrying circuit connecting the transformer winding leads and bushings is in a poor connection condition.

[0102] In the above-mentioned method for identifying the connection status of the current-carrying circuit between the transformer winding and the bushing, the vibration spectrum corresponding to the vibration signal within a preset range of the current-carrying circuit between the transformer winding and the bushing can be obtained. Multiple actual center frequencies corresponding to the transformer's vibration frequency are determined from the vibration spectrum. Symmetrical frequencies are searched within a preset search range of each actual center frequency. Two frequencies in each group of symmetrical frequencies are located on either side of the actual center frequency, and the difference between each frequency and the actual center frequency is matched. Then, the first vibration power of each group of symmetrical frequencies and the second vibration power of the vibration spectrum can be obtained. Based on the ratio of the first vibration power to the second vibration power, a vibration power ratio is obtained. Finally, based on the vibration power ratio, the identification result of the connection status of the current-carrying circuit between the transformer winding and the bushing is determined. This application theoretically demonstrates that the appearance of symmetrical frequencies on both sides of the main vibration frequency of the transformer is an important characteristic of poor connection of the current-carrying circuit between the transformer winding and the bushing. At the same time, by calculating the first vibration power corresponding to the symmetrical frequency and the second vibration power of the vibration spectrum, the connection status identification result is determined based on their vibration power ratio. This effectively reduces the interference of system operating conditions such as transformer load, harmonics, and DC bias on the identification result, and has stronger robustness. It improves the accuracy and reliability of the identification of the connection status of the current-carrying circuit between the transformer winding and the bushing, and effectively improves the fault identification accuracy.

[0103] In one embodiment, step S102, determining multiple actual center frequencies corresponding to the transformer's vibration frequency in the vibration spectrum, may include the following steps:

[0104] In the vibration spectrum, determine multiple preset center frequencies corresponding to the vibration frequency of the transformer; based on the preset center frequency search tolerance, determine the search range of each preset center frequency; determine the maximum amplitude of the vibration component within the search range of each preset center frequency, and take the frequency corresponding to the maximum amplitude of the vibration component as the actual center frequency.

[0105] In some examples, since the transformer's vibration frequency is typically a preset frequency value and its harmonics, such as 100Hz and its harmonics, 100Hz and its integer harmonics can be selected as the preset center frequency within the 1~2000Hz frequency range. The preset center frequency can be represented by ω.c_i This indicates that i = 100, 200...2000.

[0106] Considering factors such as sampling errors in the data acquisition device, the preset center frequency ω is... c_i The actual center frequency ω real_i Possibly relative to the preset center frequency ω c_i An offset occurs, but this offset is usually small; therefore, the center frequency search tolerance ω can be preset. r Then, the tolerance ω is searched based on the center frequency. r Determine the search range for each preset center frequency; for example, the search range can be determined as [ω]. c_i -ω r ω c_i +ω r ].

[0107] Furthermore, within the search range [ω] c_i -ω r ω c_i +ω r Within [the search area], find the maximum amplitude A of the vibration component. max_i And the maximum amplitude A of the vibration component max_i The corresponding frequency is taken as the actual center frequency ω. real_i For example, the actual center frequency. It can be determined as shown in the following formula (7):

[0108] (7)

[0109] Where max represents finding the maximum amplitude within a given frequency range; argmax represents the frequency at which the amplitude reaches its maximum value.

[0110] Although the vibration frequency of a transformer theoretically follows a specific pattern, in actual operation, due to various factors, the actual vibration frequency may deviate from the theoretical value. In this embodiment, by determining the search range of each preset center frequency based on the preset center frequency search tolerance, and using the frequency corresponding to the maximum amplitude of the vibration component within the search range as the actual center frequency, the actual vibration frequency of the transformer can be accurately captured. Furthermore, based on this actual vibration frequency, the symmetrical frequencies related to the fault can be accurately searched and identified on both sides, effectively assessing the transformer's operating status and fault conditions, and improving the accuracy and reliability of fault diagnosis.

[0111] In one embodiment, in step S103, searching for symmetrical frequencies within a preset search range for each actual center frequency may include:

[0112] For each actual center frequency, using a preset frequency range as the search radius, multiple first local extremum frequencies on one side of the actual center frequency and multiple second local extremum frequencies on the other side are determined; the multiple first local extremum frequencies and multiple second local extremum frequencies are paired to obtain each pair of paired first local extremum frequencies and second local extremum frequencies; based on each pair of paired first local extremum frequencies and second local extremum frequencies, the symmetrical frequency is determined.

[0113] Determining the actual center frequency ω real_i Then, at the actual center frequency ω real_i On both sides, search for the presence of a symmetrical frequency component Ω. Specifically, the search frequency radius can be determined based on a preset frequency range R, and then [ω] can be extracted. real_i -R, ω real_i The frequencies of local extrema points located on either side of the actual center frequency within the preset search range determined by +R] are defined as follows: The local extrema point frequencies are the frequencies corresponding to the local extrema points within the aforementioned search range in the vibration spectrum. For ease of distinction, the frequencies corresponding to the local extrema points located on one side of the actual center frequency are referred to as the first local extrema point frequencies, and the frequencies corresponding to the local extrema points located on the other side of the actual center frequency are referred to as the second local extrema point frequencies.

[0114] Then, multiple first local extremum frequencies and multiple second local extremum frequencies can be paired; that is, one of the multiple first local extremum frequencies can be paired with one of the multiple second local extremum frequencies, thereby obtaining each pair of paired first local extremum frequencies and second local extremum frequencies. Furthermore, based on each pair of paired first local extremum frequencies and second local extremum frequencies, symmetrical frequencies can be determined. Each pair of symmetrical frequencies contains one first local extremum frequency and one second local extremum frequency. Different pairs of symmetrical frequencies contain different local extremum frequencies.

[0115] In this embodiment, on the one hand, by screening local extreme points according to the search radius, relatively significant local peak points within the preset range of the actual center frequency can be retained, which helps to eliminate smooth fluctuation frequencies caused by noise. On the other hand, by pairing the first local extreme point frequencies and the second local extreme point frequencies on both sides, it is possible to ensure that the frequency pairs found are caused by periodic contact separation due to poor connection, rather than accidental noise, based on the theory that poor connection leads to the superposition of ±Ω frequency components on both sides of the main vibration frequency, thus providing an accurate and reliable reference for subsequent identification of connection status.

[0116] In one embodiment, using a preset frequency range as the search radius, determining multiple first local extremum frequencies on one side of the actual center frequency and multiple second local extremum frequencies on the other side includes:

[0117] Using a preset frequency range as the search radius, determine the amplitude of local extreme points located on both sides of the actual center frequency; the amplitude of the local extreme points is greater than or equal to the vibration amplitude corresponding to the frequency within the preset range of the local extreme point amplitude; based on the frequency corresponding to each local extreme point amplitude, obtain multiple first local extreme point frequencies and multiple second local extreme point frequencies on the other side.

[0118] In specific implementation, the search frequency radius can be determined based on a preset frequency range R, and [ω] can be extracted. real_i -R, ω real_i The amplitude of the vibration component A at each frequency within +R] R_j , where j represents [ω real_i -R, ω real_i The number of frequencies within the range of +R]. Then, within [ω] real_i -R, ω real_i Within the range of ω, find the local extreme points. real_i ω real_i Within the range of +R], local extrema are also found. For ease of distinction, in some examples, the local extrema on both sides can be referred to as the first local extrema and the second local extrema, respectively.

[0119] In some examples, if the vibration amplitude of a certain frequency is greater than or equal to the vibration amplitudes of the two adjacent frequencies on its left and right sides, then the point determined by that frequency and its vibration amplitude can be identified as a local extremum point. For example, the amplitude A of the local extremum point can be determined according to the following formula (8). R _ localmax :

[0120] (8)

[0121] Among them, in [ω real_i -R, ω real_i The amplitude of a local extreme point that meets the condition of equation (8) can be denoted as A_ localmax- (n), in [ω real_i ω real_i The magnitude of the local extreme point within the range +R that satisfies the condition of equation (8) can be denoted as A_ localmax+ (n), where n represents the number of local extrema. Correspondingly, the frequencies of these local extrema are denoted as Ω. _localmax- (n) and Ω _localmax+ (n), from which multiple first local extremum frequencies Ω can be obtained. _localmax- (n) and the frequencies Ω of multiple second local extrema on the other side _localmax+ (n).

[0122] When a connection failure occurs, the vibration energy at the fault point will exhibit obvious peaks at certain frequencies. The frequencies corresponding to these local extreme point amplitudes are likely to be the frequencies related to the fault. In this embodiment, a preset frequency range is used as the search radius to search for local extreme point amplitudes on both sides of the actual center frequency. This can accurately locate the frequency points where the energy is relatively concentrated, quickly determine the first and second local extreme point frequencies that may be related to the connection failure, eliminate invalid frequency interference, and provide a strong basis for subsequent accurate judgment of the connection status.

[0123] In one embodiment, pairing multiple first local extremum point frequencies and multiple second local extremum point frequencies to obtain each pair of paired first local extremum point frequencies and second local extremum point frequencies may include the following steps:

[0124] Based on the actual center frequency corresponding to the first local extremum frequency, determine the desired symmetrical frequency that is symmetrical to the first local extremum frequency; match the desired symmetrical frequency with multiple second local extremum frequencies, and pair the successfully matched second local extremum frequencies with the first local extremum frequencies.

[0125] In practice, after obtaining the first local extremum frequency and the second local extremum frequency on both sides, the local extremum frequency on one side can be used as a reference to match the local extremum frequency on the other side.

[0126] Specifically, it may be at the actual center frequency ω real_i Multiple local extrema appear on both sides, therefore matching Ω_ is required. localmax- (n) and Ω_ localmax+ (n). Specifically, for each first local extremum frequency, such as Ω_ localmax- (p), its expected symmetric frequency Ω can be calculated first. p+ This frequency, also known as the desired symmetrical frequency, can be obtained by symmetrically processing the first local extremum frequency based on the actual center frequency. Then, the desired symmetrical frequency can be obtained from a given set of multiple second local extremum frequencies Ω_ localmax+ Find the frequency Ω that is symmetric to the desired frequency in (n). p+ The closest frequency Ω_ localmax+ (q). If Ω_ p+ With Ω_ localmax+ The matching error of (q) is within the allowable tolerance Ω. tol If the match is within the specified range, then it is considered a successful match.

[0127] In some examples, the corresponding second local extremum frequency Ω_ can be obtained by matching using equation (9) as shown below. localmax+ (q).

[0128] (9)

[0129] In this embodiment, by determining the expected symmetrical frequency of the first local extremum point frequency, and then matching the expected symmetrical frequency with multiple second local extremum point frequencies, the successfully matched second local extremum point frequencies are paired with the first local extremum point frequencies. This allows for pre-screening of the expected frequencies through symmetry, reducing invalid matching attempts for the second local extremum points and effectively improving the screening efficiency of the matched second local extremum points.

[0130] In one embodiment, determining the symmetric frequency based on the first local extremum frequency and the second local extremum frequency of each pair of pairs may include the following steps:

[0131] Obtain the first average amplitude of multiple actual center frequencies; for each pair of first local extreme point frequencies and second local extreme point frequencies, obtain the second average amplitude of the first local extreme point frequencies and second local extreme point frequencies, and when the amplitude ratio of the second average amplitude to the first average amplitude is greater than a preset threshold, the paired first local extreme point frequencies and second local extreme point frequencies are taken as symmetrical frequencies.

[0132] In practical applications, for successfully matched symmetrical frequencies Ω_localmax-(p) and Ω_localmax+(q), the ratio of their average amplitude to the amplitude of the center frequency can be further calculated to determine whether the symmetrical frequency is effective. In this embodiment, on the one hand, the first average amplitude corresponding to the amplitudes of multiple actual center frequencies can be calculated; on the other hand, for each pair of paired first local extremum frequency and second local extremum frequency, the average value corresponding to the amplitudes of these two frequencies, i.e., the second average amplitude, can be calculated.

[0133] Then, the ratio between the second average amplitude and the first average amplitude, i.e., the amplitude ratio, can be calculated. When the amplitude ratio is greater than the preset threshold ratio_th, the paired first local extreme point frequency and the second local extreme point frequency can be used as the symmetrical frequency.

[0134] In some examples, it can be determined whether the first local extremum frequency and the second local extremum frequency of the pair are valid symmetric frequencies according to the following equation (10):

[0135] (10)

[0136] In this embodiment, the ratio of the second average amplitude of the pairing frequency to the first average amplitude of the actual center frequency is used to determine the pairing. This avoids relying solely on frequency symmetry and can filter out incorrect pairings caused by noise or asymmetric interference, ensuring that only physically meaningful symmetrical frequencies are retained. At the same time, by filtering by amplitude ratio, only pairings that meet the conditions are retained, reducing the computational load of invalid matches. In addition, the preset threshold can be adjusted according to the application scenario to balance recognition accuracy and computational cost.

[0137] To enable those skilled in the art to better understand the above steps, the following example illustrates the embodiments of this application, but it should be understood that the embodiments of this application are not limited thereto.

[0138] like Figure 2 As shown, this embodiment may include the following steps:

[0139] S201, obtain the vibration spectrum corresponding to the vibration signal within the preset range of the current-carrying circuit between the transformer winding and the bushing.

[0140] S202, determine multiple preset center frequencies corresponding to the vibration frequency of the transformer in the vibration spectrum, determine the search range of each preset center frequency according to the preset center frequency search tolerance, determine the maximum amplitude of the vibration component within the search range of each preset center frequency, and take the frequency corresponding to the maximum amplitude of the vibration component as the actual center frequency.

[0141] S203, for each actual center frequency, using a preset frequency range as the search radius, determine the amplitude of local extreme points located on both sides of the actual center frequency; based on the frequency corresponding to each local extreme point amplitude, obtain multiple first local extreme point frequencies and multiple second local extreme point frequencies on the other side.

[0142] S204, based on the actual center frequency corresponding to the first local extremum frequency, determine the desired symmetrical frequency that is symmetrical to the first local extremum frequency; match the desired symmetrical frequency with multiple second local extremum frequencies, and pair the successfully matched second local extremum frequencies with the first local extremum frequencies.

[0143] S205, obtain the first average amplitude of each actual center frequency; for each pair of first local extreme point frequencies and second local extreme point frequencies, obtain the second average amplitude of the first local extreme point frequencies and second local extreme point frequencies, and when the amplitude ratio of the second average amplitude to the first average amplitude is greater than a preset threshold, take the pair of first local extreme point frequencies and second local extreme point frequencies as symmetrical frequencies.

[0144] S206, obtain the first vibration power of each group of symmetrical frequencies and the second vibration power of the vibration spectrum, and obtain the vibration power ratio based on the ratio of the first vibration power and the second vibration power.

[0145] S207, Based on the vibration power ratio, determine the connection status identification result of the current-carrying circuit between the transformer winding and the bushing.

[0146] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0147] Based on the same inventive concept, this application also provides a device for identifying the connection state of the current-carrying circuit between the transformer winding and the bushing, for implementing the method for identifying the connection state of the current-carrying circuit between the transformer winding and the bushing as described above. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations of one or more embodiments of the device for identifying the connection state of the current-carrying circuit between the transformer winding and the bushing provided below can be found in the limitations of the method for identifying the connection state of the current-carrying circuit between the transformer winding and the bushing described above, and will not be repeated here.

[0148] In one exemplary embodiment, such as Figure 3 As shown, a device for identifying the connection status of the current-carrying circuit between a transformer winding and a bushing is provided, comprising:

[0149] The spectrum acquisition module 301 is used to acquire the vibration spectrum corresponding to the vibration signal within a preset range of the current-carrying circuit between the transformer winding and the bushing.

[0150] The actual center frequency determination module 302 is used to determine multiple actual center frequencies in the vibration spectrum that correspond to the vibration frequency of the transformer.

[0151] The symmetrical frequency determination module 303 is used to search for symmetrical frequencies within a preset search range of each actual center frequency; two frequencies in each group of symmetrical frequencies are respectively on both sides of the actual center frequency, and the difference between each of the two frequencies and the actual center frequency is matched.

[0152] The ratio acquisition module 304 is used to acquire the first vibration power of each group of symmetrical frequencies and the second vibration power of the vibration spectrum, and to obtain the vibration power ratio based on the ratio of the first vibration power to the second vibration power.

[0153] The connection status identification module 305 is used to determine the connection status identification result of the current-carrying circuit between the transformer winding and the bushing based on the vibration power ratio.

[0154] In one embodiment, the symmetry frequency determination module 303 is used for:

[0155] For each actual center frequency, a preset frequency range is used as the search radius to determine multiple first local extremum frequencies on one side of the actual center frequency and multiple second local extremum frequencies on the other side.

[0156] Pair multiple first local extremum point frequencies and multiple second local extremum point frequencies to obtain each pair of first local extremum point frequencies and second local extremum point frequencies.

[0157] The symmetrical frequency is determined based on the first local extremum frequency and the second local extremum frequency of each pair.

[0158] In one embodiment, the symmetry frequency determination module 303 is used for:

[0159] Based on the actual center frequency corresponding to the first local extreme point frequency, determine the desired symmetrical frequency that is symmetrical to the first local extreme point frequency.

[0160] The desired symmetrical frequency is matched with multiple second local extremum frequency, and the successfully matched second local extremum frequency is paired with the first local extremum frequency.

[0161] In one embodiment, the symmetry frequency determination module 303 is used for:

[0162] Using a preset frequency range as the search radius, determine the amplitude of local extreme points located on both sides of the actual center frequency; the amplitude of the local extreme points is greater than or equal to the vibration amplitude corresponding to the frequency within the preset range of the amplitude of the local extreme points.

[0163] Based on the frequencies corresponding to the amplitudes of each local extremum point, multiple first local extremum point frequencies and multiple second local extremum point frequencies on the other side are obtained.

[0164] In one embodiment, the symmetry frequency determination module 303 is used for:

[0165] Obtain the first average amplitude of the multiple actual center frequencies;

[0166] For each pair of first local extreme point frequencies and second local extreme point frequencies, a second average amplitude of the first local extreme point frequencies and the second local extreme point frequencies is obtained, and when the amplitude ratio of the second average amplitude to the first average amplitude is greater than a preset threshold, the pair of first local extreme point frequencies and second local extreme point frequencies are taken as symmetrical frequencies.

[0167] In one embodiment, the actual center frequency determination module 302 is used for:

[0168] In the vibration spectrum, a plurality of preset center frequencies corresponding to the vibration frequency of the transformer are determined;

[0169] The search range for each preset center frequency is determined based on the preset center frequency search tolerance.

[0170] The maximum amplitude of the vibration component within the search range of each preset center frequency is determined, and the frequency corresponding to the maximum amplitude of the vibration component is taken as the actual center frequency.

[0171] Each module in the aforementioned device for identifying the connection status of the current-carrying circuit between the transformer winding and the bushing can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independently of the processor, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0172] In one exemplary embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 4As shown, the computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The database stores vibration signals within a preset range of the current-carrying circuit between the transformer winding and the bushing. The I / O interfaces are used for information exchange between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When executed by the processor, the computer program implements a method for identifying the connection status of the current-carrying circuit between the transformer winding and the bushing.

[0173] In one exemplary embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 5 As shown, the computer device includes a processor, memory, input / output interface, communication interface, display unit, and input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are also connected to the system bus via the input / output interface. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The input / output interface is used for exchanging information between the processor and external devices. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, Near Field Communication (NFC), or other technologies. When executed by the processor, the computer program implements a method for identifying the connection status of the current-carrying circuit between transformer windings and bushings. The display unit is used to form a visually visible image and can be a display screen, projection device, or virtual reality imaging device. The display screen can be an LCD screen or an e-ink screen. The input device of the computer device can be a touch layer covering the display screen, or buttons, trackballs, or touchpads set on the casing of the computer device, or external keyboards, touchpads, or mice, etc.

[0174] Those skilled in the art will understand that Figure 4 and Figure 5 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0175] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above-described method embodiments.

[0176] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps in the above method embodiments.

[0177] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above method embodiments.

[0178] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0179] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0180] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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, they should be considered to be within the scope of this application.

[0181] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for identifying the connection status of the current-carrying circuit between a transformer winding and a bushing, characterized in that, The method includes: Obtain the vibration spectrum corresponding to the vibration signal within a preset range of the current-carrying circuit between the transformer winding and the bushing; In the vibration spectrum, determine a plurality of actual center frequencies corresponding to the vibration frequency of the transformer; For each actual center frequency, using a preset frequency range as the search radius, the amplitudes of local extreme points located on both sides of the actual center frequency are determined. The amplitudes of these local extreme points are greater than or equal to the vibration amplitudes corresponding to frequencies within the preset range of the local extreme point amplitudes. Based on the frequencies corresponding to each local extreme point amplitude, multiple first local extreme point frequencies and multiple second local extreme point frequencies on the other side are obtained. Based on the actual center frequency corresponding to the first local extreme point frequencies, a desired symmetrical frequency symmetrical to the first local extreme point frequency is determined. This desired symmetrical frequency is matched with multiple second local extreme point frequencies, and the successfully matched second local extreme point frequencies are paired with the first local extreme point frequencies. Based on each pair of paired first and second local extreme point frequencies, a symmetrical frequency is determined. Two frequencies in each pair of symmetrical frequencies are located on both sides of the actual center frequency, and the difference between each of the two frequencies and the actual center frequency is matched. Obtain the first vibration power of each group of symmetrical frequencies and the second vibration power of the vibration spectrum, and obtain the vibration power ratio based on the ratio of the first vibration power to the second vibration power; Based on the vibration power ratio, the connection status identification result of the current-carrying circuit between the transformer winding and the bushing is determined.

2. The method according to claim 1, characterized in that, The step of determining the symmetrical frequency based on the first local extremum frequency and the second local extremum frequency of each pair includes: Obtain the first average amplitude of the multiple actual center frequencies; For each pair of first local extreme point frequencies and second local extreme point frequencies, a second average amplitude of the first local extreme point frequencies and the second local extreme point frequencies is obtained, and when the amplitude ratio of the second average amplitude to the first average amplitude is greater than a preset threshold, the pair of first local extreme point frequencies and second local extreme point frequencies are taken as symmetrical frequencies.

3. The method according to any one of claims 1 or 2, characterized in that, The determination of multiple actual center frequencies corresponding to the vibration frequency of the transformer in the vibration spectrum includes: In the vibration spectrum, a plurality of preset center frequencies corresponding to the vibration frequency of the transformer are determined; The search range for each preset center frequency is determined based on the preset center frequency search tolerance. The maximum amplitude of the vibration component within the search range of each preset center frequency is determined, and the frequency corresponding to the maximum amplitude of the vibration component is taken as the actual center frequency.

4. A device for identifying the connection status of the current-carrying circuit between a transformer winding and a bushing, characterized in that, The device includes: The spectrum acquisition module is used to acquire the vibration spectrum corresponding to the vibration signal within a preset range of the current-carrying circuit between the transformer winding and the bushing. The actual center frequency determination module is used to determine multiple actual center frequencies in the vibration spectrum that correspond to the vibration frequency of the transformer. A symmetry frequency determination module is used to determine the amplitude of local extreme points located on both sides of the actual center frequency for each actual center frequency, using a preset frequency range as the search radius. The amplitude of the local extreme points is greater than or equal to the vibration amplitude corresponding to the frequency within the preset range of the local extreme point amplitude. Based on the frequencies corresponding to the amplitudes of each local extreme point, multiple first local extreme point frequencies and multiple second local extreme point frequencies on the other side are obtained. Based on the actual center frequency corresponding to the first local extreme point frequencies, a desired symmetry frequency symmetrical to the first local extreme point frequencies is determined. The desired symmetry frequency is matched with the multiple second local extreme point frequencies, and the successfully matched second local extreme point frequencies are paired with the first local extreme point frequencies. Based on each pair of paired first local extreme point frequencies and second local extreme point frequencies, a symmetry frequency is determined. Two frequencies in each group of symmetry frequencies are located on both sides of the actual center frequency, and the difference between each of the two frequencies and the actual center frequency is matched. The ratio acquisition module is used to acquire the first vibration power of each group of symmetrical frequencies and the second vibration power of the vibration spectrum, and to obtain the vibration power ratio based on the ratio of the first vibration power to the second vibration power. The connection status identification module is used to determine the connection status identification result of the current-carrying circuit between the transformer winding and the bushing based on the vibration power ratio.

5. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 3.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 3.

7. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 3.

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