Transformer winding deformation situation searching method and device, computer equipment and medium

Abstract

The application relates to a transformer winding deformation condition searching method and device, computer equipment and a medium. The method comprises the following steps: setting a current winding deformation condition in a finite element model of a target transformer, obtaining circuit model parameters and constructing a corresponding current circuit model, performing frequency sweep simulation on the current circuit model, obtaining simulation frequency sweep results, obtaining the similarity between the simulation frequency sweep results and actual frequency sweep results, recording the similarity as a new maximum similarity degree when the similarity is greater than a pre-recorded maximum similarity degree, taking any untraversed winding deformation condition as a new current winding deformation condition when the traversal is not completed, returning to the step of setting the current winding deformation condition until the traversal is completed, and taking the winding deformation condition corresponding to the maximum similarity degree as the winding deformation condition of the target transformer. The risk of secondary damage to the transformer is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transformer winding deformation, and in particular to a transformer winding deformation condition searching method and device, computer equipment, computer readable storage medium and computer program product. BACKGROUND

[0002] The transformer is a core device in the power system, and its safe and stable operation is the cornerstone of the reliable operation of the new power system. Transformer winding deformation refers to irreversible changes in the size or shape of the winding under the action of electric force and mechanical force. As the winding deformation intensifies, its tolerance decreases, so it is easy to cause slight deformation under overcurrent. The slight deformation of the winding will cause partial damage to its insulation and cause partial discharge, further accelerating the aging of the insulation. As the winding slight deformation and insulation aging intensify, once a serious external short circuit occurs, the winding may be severely deformed, directly damaging the transformer, and even causing the transformer to shut down, resulting in a large area power outage. Currently, after the transformer withstands the short-circuit current impact, the hanging cover is usually used to check whether the winding is deformed and the pad is loose.

[0003] However, the current hanging cover detection method has the risk of secondary damage. SUMMARY

[0004] Therefore, it is necessary to provide a transformer winding deformation condition searching method, device, computer equipment, computer readable storage medium and computer program product to avoid secondary damage.

[0005] In a first aspect, the present application provides a transformer winding deformation condition searching method, comprising:

[0006] obtaining the current transformer winding deformation condition, and setting the current transformer winding deformation condition in the pre-constructed finite element model of the target transformer to obtain the circuit model parameters matched with the current transformer winding deformation condition;

[0007] According to the circuit model parameters, a current winding circuit model corresponding to the current transformer winding deformation condition is constructed, and the current winding circuit model is swept frequency simulated to obtain the simulation sweep frequency result of the current winding circuit model;

[0008] obtaining the similarity degree between the simulation sweep frequency result and the actual sweep frequency result of the target transformer, and recording the similarity degree as a new maximum similarity degree in the case that the similarity degree is greater than the pre-recorded maximum similarity degree;

[0009] In the case where the transformer winding deformation conditions are not traversed, any untraversed transformer winding deformation condition is taken as a new current transformer winding deformation condition, and the step of setting the current transformer winding deformation condition in the pre-constructed finite element model of the target transformer is returned to execute until the traversal of each transformer winding deformation condition is completed.

[0010] In the case where the traversal of each transformer winding deformation condition is completed, the transformer winding deformation condition corresponding to the recorded maximum similarity degree is taken as the transformer winding deformation condition of the target transformer.

[0011] In one embodiment, the circuit model parameters include equivalent longitudinal capacitance, ground capacitance, and inductance.

[0012] According to the circuit model parameters, a current winding circuit model corresponding to the current transformer winding deformation condition is constructed, including:

[0013] According to the equivalent longitudinal capacitance, the ground capacitance, and the inductance, a plurality of sub-windings are constructed.

[0014] The electromagnetic connection relationship between each sub-winding, as well as the input voltage, input resistance, and output resistance, is obtained.

[0015] The electromagnetic connection relationship is used to connect each sub-winding, and the input voltage, input resistance, and output resistance are combined to construct the current winding circuit model corresponding to the current transformer winding deformation condition.

[0016] In one embodiment, the finite element model includes an electric field module and a magnetic field module.

[0017] In the pre-constructed finite element model of the target transformer, the current transformer winding deformation condition is set to obtain the circuit model parameters matching the current transformer winding deformation condition, including:

[0018] The turn-to-turn capacitance, pie-to-pie capacitance, and geometric capacitance of each sub-winding matching the current transformer winding deformation condition are obtained through the electric field module of the finite element model, the equivalent longitudinal capacitance of each sub-winding is obtained according to the turn-to-turn capacitance and pie-to-pie capacitance, and the ground capacitance of each sub-winding is obtained based on the geometric capacitance.

[0019] The inductance of each sub-winding is obtained through the magnetic field module of the finite element model.

[0020] In one embodiment, the similarity between the simulation sweep frequency result and the actual sweep frequency result of the target transformer is obtained, including:

[0021] obtaining a peak similarity degree between a peak of the simulation sweep result and a peak of the actual sweep result, a valley similarity degree between a valley of the simulation sweep result and a valley of the actual sweep result, and a partial similarity degree between a remaining part of the simulation sweep result and a remaining part of the actual sweep result;

[0022] obtaining a first weight corresponding to the pre-set peak similarity degree, a second weight corresponding to the pre-set valley similarity degree, and a third weight corresponding to the pre-set partial similarity degree;

[0023] weighting the peak similarity degree, the valley similarity degree and the partial similarity degree according to the first weight, the second weight and the third weight to obtain the similarity degree.

[0024] In an exemplary embodiment, after obtaining the similarity degree between the simulation sweep result and the actual sweep result of the target transformer, the method further comprises:

[0025] In the case that the similarity degree is not greater than the pre-recorded maximum similarity degree, the similarity degree is not recorded as a new maximum similarity degree.

[0026] In an embodiment, before the target transformer appears transformer winding deformation, the method comprises:

[0027] obtaining a circuit model parameter of the target transformer, and constructing a circuit model of the target transformer according to the circuit model parameter;

[0028] performing sweep simulation on the circuit model to obtain a first simulation sweep result of the circuit model;

[0029] obtaining a similarity degree between the first simulation sweep result and the actual sweep result, and determining that the target transformer passes the search condition test of the transformer winding deformation condition search in the case that the similarity degree is greater than a pre-set similarity degree threshold.

[0030] In a second aspect, the application further provides a transformer winding deformation condition search device, comprising:

[0031] a first obtaining module, configured to obtain a current transformer winding deformation condition, and set the current transformer winding deformation condition in a pre-constructed finite element model of a target transformer to obtain a circuit model parameter matched with the current transformer winding deformation condition;

[0032] a sweep module, configured to construct a current winding circuit model corresponding to the current transformer winding deformation condition according to the circuit model parameter, and perform sweep simulation on the current winding circuit model to obtain a simulation sweep result of the current winding circuit model;

[0033] a second obtaining module, configured to obtain a similarity degree between the simulation sweep result and an actual sweep result of the target transformer, and record the similarity degree as a new maximum similarity degree if the similarity degree is greater than a previously recorded maximum similarity degree;

[0034] a traversal module, configured to, if the traversal of the transformer winding deformation conditions is not completed, take any untraversed transformer winding deformation condition as a new current transformer winding deformation condition, and return to execute the step of setting the current transformer winding deformation condition in the previously constructed finite element model of the target transformer, until the traversal of the transformer winding deformation conditions is completed;

[0035] an output module, configured to, if the traversal of the transformer winding deformation conditions is completed, take the transformer winding deformation condition corresponding to the recorded maximum similarity degree as the transformer winding deformation condition of the target transformer.

[0036] In a third aspect, the present application further provides a computer device, comprising a memory and a processor, the memory stores a computer program, and the processor implements the following steps when executing the computer program:

[0037] obtaining a current transformer winding deformation condition, and setting the current transformer winding deformation condition in a previously constructed finite element model of a target transformer, to obtain a circuit model parameter matched with the current transformer winding deformation condition;

[0038] constructing a current winding circuit model corresponding to the current transformer winding deformation condition according to the circuit model parameter, and performing sweep simulation on the current winding circuit model to obtain a simulation sweep result of the current winding circuit model;

[0039] obtaining a similarity degree between the simulation sweep result and an actual sweep result of the target transformer, and recording the similarity degree as a new maximum similarity degree if the similarity degree is greater than a previously recorded maximum similarity degree;

[0040] if the traversal of the transformer winding deformation conditions is not completed, taking any untraversed transformer winding deformation condition as a new current transformer winding deformation condition, and returning to execute the step of setting the current transformer winding deformation condition in the previously constructed finite element model of the target transformer, until the traversal of the transformer winding deformation conditions is completed;

[0041] if the traversal of the transformer winding deformation conditions is completed, taking the transformer winding deformation condition corresponding to the recorded maximum similarity degree as the transformer winding deformation condition of the target transformer.

[0042] In a fourth aspect, the present application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the following steps:

[0043] obtaining a current transformer winding deformation condition, and setting the current transformer winding deformation condition in a pre-constructed finite element model of a target transformer to obtain circuit model parameters matched with the current transformer winding deformation condition;

[0044] constructing a current winding circuit model corresponding to the current transformer winding deformation condition according to the circuit model parameters, and performing sweep frequency simulation on the current winding circuit model to obtain a simulation sweep frequency result of the current winding circuit model;

[0045] obtaining a similarity degree between the simulation sweep frequency result and an actual sweep frequency result of the target transformer, and recording the similarity degree as a new maximum similarity degree in a case where the similarity degree is greater than a pre-recorded maximum similarity degree;

[0046] in a case where the transformer winding deformation conditions are not traversed completely, taking any untraversed transformer winding deformation condition as a new current transformer winding deformation condition, and returning to execute the step of setting the current transformer winding deformation condition in the pre-constructed finite element model of the target transformer until the transformer winding deformation conditions are traversed completely;

[0047] in a case where the transformer winding deformation conditions are traversed completely, taking a transformer winding deformation condition corresponding to the recorded maximum similarity degree as a transformer winding deformation condition of the target transformer.

[0048] In a fifth aspect, the present application further provides a computer program product comprising a computer program which, when executed by a processor, implements the following steps:

[0049] obtaining a current transformer winding deformation condition, and setting the current transformer winding deformation condition in a pre-constructed finite element model of a target transformer to obtain circuit model parameters matched with the current transformer winding deformation condition;

[0050] constructing a current winding circuit model corresponding to the current transformer winding deformation condition according to the circuit model parameters, and performing sweep frequency simulation on the current winding circuit model to obtain a simulation sweep frequency result of the current winding circuit model;

[0051] obtaining a similarity degree between the simulation sweep frequency result and an actual sweep frequency result of the target transformer, and recording the similarity degree as a new maximum similarity degree in a case where the similarity degree is greater than a pre-recorded maximum similarity degree;

[0052] In a case where the transformer winding deformation conditions are not traversed, taking any untraversed transformer winding deformation condition as a new current transformer winding deformation condition, and returning to execute the step of setting the current transformer winding deformation condition in the pre-constructed finite element model of the target transformer until the transformer winding deformation conditions are traversed;

[0053] In a case where the transformer winding deformation conditions are traversed, taking the transformer winding deformation condition corresponding to the recorded maximum similarity degree as the transformer winding deformation condition of the target transformer.

[0054] The transformer winding deformation condition searching method, device, computer equipment, computer readable storage medium and computer program product, by obtaining the current transformer winding deformation condition, setting the current transformer winding deformation condition in the pre-constructed finite element model of the target transformer, obtaining the circuit model parameters matched with the current transformer winding deformation condition, constructing the current winding circuit model corresponding to the current transformer winding deformation condition according to the circuit model parameters, performing the frequency sweep simulation on the current winding circuit model, obtaining the simulation frequency sweep result of the current winding circuit model, obtaining the similarity degree between the simulation frequency sweep result and the actual frequency sweep result of the target transformer, recording the similarity degree as a new maximum similarity degree in a case where the similarity degree is greater than the pre-recorded maximum similarity degree, taking any untraversed transformer winding deformation condition as a new current transformer winding deformation condition in a case where the transformer winding deformation conditions are not traversed, and returning to execute the step of setting the current transformer winding deformation condition in the pre-constructed finite element model of the target transformer until the transformer winding deformation conditions are traversed, taking the transformer winding deformation condition corresponding to the recorded maximum similarity degree as the transformer winding deformation condition of the target transformer in a case where the transformer winding deformation conditions are traversed. The winding deformation condition of the transformer is determined by constructing the current winding circuit model, without disassembling the transformer to check the winding deformation condition, thereby avoiding the risk of secondary damage to the transformer. BRIEF DESCRIPTION OF DRAWINGS

[0055] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings needed to be used in the description of the embodiments of the present application or the related art will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other related drawings can be obtained by those skilled in the art without creative labor.

[0056] Figure 1 The application environment diagram of the transformer winding deformation condition searching method in an embodiment;

[0057] Figure 2 a flowchart of a transformer winding deformation searching method in an embodiment;

[0058] Figure 3 a flowchart of a current winding circuit model constructing method in an embodiment;

[0059] Figure 4 a flowchart of a transformer winding deformation searching method in another embodiment;

[0060] Figure 5 a structure diagram of a current winding circuit model in an embodiment;

[0061] Figure 6 a structure block diagram of a transformer winding deformation searching device in an embodiment;

[0062] Figure 7 an internal structure diagram of a computer device in an embodiment. DETAILED DESCRIPTION

[0063] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0064] The transformer winding deformation searching method provided by the embodiments of the present application can be applied to, for example, Figure 1The application environment shown. Among them, the target transformer 102 communicates with the server 104 through the network. The data storage system can store the data required by the server 104 to process. The data storage system can be integrated on the server 104, or placed on the cloud or other network servers. The server 104 obtains the current transformer winding deformation condition, and sets the current transformer winding deformation condition in the pre-constructed finite element model of the target transformer to obtain the circuit model parameters matched with the current transformer winding deformation condition. According to the circuit model parameters, the current winding circuit model corresponding to the current transformer winding deformation condition is constructed, and the current winding circuit model is swept frequency simulation to obtain the simulation sweep frequency result of the current winding circuit model. The similarity between the simulation sweep frequency result and the actual sweep frequency result of the target transformer is obtained, and in the case that the similarity is greater than the maximum similarity recorded in advance, the similarity is recorded as a new maximum similarity. In the case that each transformer winding deformation condition is not traversed, any untraversed transformer winding deformation condition is taken as a new current transformer winding deformation condition, and the step of setting the current transformer winding deformation condition in the pre-constructed finite element model of the target transformer is returned to execute. Until each transformer winding deformation condition is traversed, finally, in the case that each transformer winding deformation condition is traversed, the transformer winding deformation condition corresponding to the recorded maximum similarity is taken as the transformer winding deformation condition of the target transformer. Among them, the server 104 can be an independent physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server providing cloud computing services.

[0065] In an exemplary embodiment, as shown in Figure 2 , a transformer winding deformation condition search method is provided, which is applied to the server 104 in Figure 1 for example, including the following steps S201 to S205. Among them:

[0066] Step S201, obtaining the current transformer winding deformation condition, and setting the current transformer winding deformation condition in the pre-constructed finite element model of the target transformer to obtain the circuit model parameters matched with the current transformer winding deformation condition.

[0067] Among them, the transformer winding deformation condition can be understood as the change of the winding geometry caused by factors such as current, temperature, environment and mechanical stress during the operation of the transformer. The current transformer winding deformation condition can be understood as the change condition of the transformer winding geometry simulated by the server itself, rather than the actual change condition. The finite element model can be understood as a numerical calculation model for analyzing and simulating the performance of the transformer, which is an analysis model formed by using the related software inside the server. The circuit model parameters can be understood as the capacitance parameters and inductance parameters of the winding.

[0068] Optionally, the server 104 obtains the current transformer winding deformation condition simulated by itself, and sets the current transformer winding deformation condition in the pre-constructed finite element model of the target transformer 102 to obtain the circuit model parameters matched with the current transformer winding deformation condition. By setting the current transformer winding deformation condition in the finite element model of the target transformer 102, the circuit model parameters under multiple deformation conditions can be obtained, which lays a data foundation for subsequent construction of the corresponding current winding circuit model according to the circuit model parameters.

[0069] Step S202, according to the circuit model parameters, a current winding circuit model corresponding to the current transformer winding deformation condition is constructed, and the current winding circuit model is swept frequency simulated to obtain the simulation sweep frequency result of the current winding circuit model.

[0070] Step S203, the similarity between the simulation sweep frequency result and the actual sweep frequency result of the target transformer is obtained, and in the case that the similarity is greater than the maximum similarity degree recorded in advance, the similarity is recorded as a new maximum similarity degree.

[0071] Wherein, the winding circuit model can be understood as a conventional circuit model containing the winding, and the sweep frequency simulation can be understood as gradually changing the frequency of the input signal within a certain frequency range, and recording the output response of the system.

[0072] For example, the server 104 constructs a current winding circuit model corresponding to the current transformer winding deformation condition according to the circuit model parameters, and performs sweep frequency simulation on the current winding circuit model to obtain the simulation sweep frequency result of the current winding circuit model, and obtains the similarity between the simulation sweep frequency result and the actual sweep frequency result of the target transformer 102, and in the case that the similarity is greater than the maximum similarity degree recorded in advance, the similarity is recorded as a new maximum similarity degree. By obtaining the similarity between the simulation sweep frequency result and the actual sweep frequency result, and in the case that the similarity obtained this time is greater than the maximum similarity degree recorded in advance, the similarity this time is recorded as a new maximum similarity degree, which ensures the timely updating of the maximum similarity degree and further ensures the determination accuracy of the transformer winding deformation condition.

[0073] Step S204, in the case that the transformer winding deformation conditions are not traversed, any untraversed transformer winding deformation condition is taken as a new current transformer winding deformation condition, and the step of setting the current transformer winding deformation condition in the pre-constructed finite element model of the target transformer is returned to be executed until the traversal of the transformer winding deformation conditions is completed.

[0074] Step S205, in the case where the traversal of each transformer winding deformation condition is completed, the transformer winding deformation condition corresponding to the recorded maximum similarity degree is taken as the transformer winding deformation condition of the target transformer.

[0075] For example, in the case where the traversal of each transformer winding deformation condition is not completed, any untraversed transformer winding deformation condition is taken as a new current transformer winding deformation condition, and the step of setting the current transformer winding deformation condition in the pre-constructed finite element model of the target transformer 102 is executed again until the traversal of each transformer winding deformation condition is completed. In the case where the traversal of each transformer winding deformation condition is completed, the transformer winding deformation condition corresponding to the recorded maximum similarity degree is taken as the transformer winding deformation condition of the target transformer. The traversal of all possible transformer winding deformation conditions of the transformer is required to avoid the omission of any transformer winding deformation condition, which may result in the maximum similarity degree determined not being the maximum similarity degree, thereby improving the determination accuracy of the transformer winding deformation condition of the target transformer.

[0076] In the above transformer winding deformation condition searching method, the current transformer winding deformation condition is obtained, and the current transformer winding deformation condition is set in the pre-constructed finite element model of the target transformer to obtain circuit model parameters matched with the current transformer winding deformation condition. According to the circuit model parameters, a current winding circuit model corresponding to the current transformer winding deformation condition is constructed, and the current winding circuit model is swept and simulated to obtain a simulation swept frequency result of the current winding circuit model. The similarity degree between the simulation swept frequency result and the actual swept frequency result of the target transformer is obtained. In the case where the similarity degree is greater than a pre-recorded maximum similarity degree, the similarity degree is recorded as a new maximum similarity degree. In the case where the traversal of each transformer winding deformation condition is not completed, any untraversed transformer winding deformation condition is taken as a new current transformer winding deformation condition, and the step of setting the current transformer winding deformation condition in the pre-constructed finite element model of the target transformer is executed again until the traversal of each transformer winding deformation condition is completed. In the case where the traversal of each transformer winding deformation condition is completed, the transformer winding deformation condition corresponding to the recorded maximum similarity degree is taken as the transformer winding deformation condition of the target transformer. The traversal of the winding deformation condition of the transformer is achieved by constructing the current winding circuit model, without disassembling the transformer to check the winding deformation condition, thereby avoiding the risk of secondary damage to the transformer.

[0077] In an exemplary embodiment, the circuit model parameters include equivalent longitudinal capacitance, ground capacitance, and inductance, as shown in the following formula: Figure 3As shown, according to the circuit model parameters, a current winding circuit model corresponding to the current transformer winding deformation condition is constructed, including steps S301 to S303. Among them:

[0078] Step S301, according to the equivalent longitudinal capacitance, the ground capacitance and the inductance, a plurality of sub-windings are constructed.

[0079] Step S302, the electromagnetic connection relationship between each sub-winding, and the input voltage, the input resistance and the output resistance are obtained.

[0080] Among them, the equivalent longitudinal capacitance can be understood as the capacitive effect existing between the windings or between the winding and the core, which is formed due to the existence of insulating materials, the geometric shape of the winding, and the distribution of voltage; the ground capacitance can be understood as the ability of the conductor to store charge; the electromagnetic connection relationship can be understood as the connection relationship of the capacitance and the head-tail connection relationship of the capacitance.

[0081] Optionally, the server 104 constructs a plurality of sub-windings by using the equivalent longitudinal capacitance, the ground capacitance and the inductance, and obtains the electromagnetic connection relationship between each sub-winding, and the input voltage, the input resistance and the output resistance which jointly constitute the current winding circuit model, laying a data foundation for subsequent construction of the current winding circuit model.

[0082] Step S303, using the electromagnetic connection relationship to connect each sub-winding, and combining the input voltage, the input resistance and the output resistance, a current winding circuit model corresponding to the current transformer winding deformation condition is constructed.

[0083] For example, the server 104 connects the head and tail of each sub-winding by using the electromagnetic connection relationship, and inputs the input voltage, the input resistance and the output resistance, to construct a current winding circuit model corresponding to the current transformer winding deformation condition. By separating each sub-winding independently, it is easy to adjust the circuit model parameters of each winding when the transformer winding deformation condition changes, reducing the operation complexity of the experiment.

[0084] In one embodiment, the finite element model includes an electric field module and a magnetic field module, and the current transformer winding deformation condition is set in the pre-constructed finite element model of the target transformer to obtain circuit model parameters matched with the current transformer winding deformation condition, including: obtaining the inter-turn capacitance, the inter-pie capacitance and the geometric capacitance of each sub-winding matched with the current transformer winding deformation condition through the electric field module of the finite element model, obtaining the equivalent longitudinal capacitance of each sub-winding according to the inter-turn capacitance and the inter-pie capacitance, and obtaining the ground capacitance of each sub-winding based on the geometric capacitance; obtaining the inductance of each sub-winding through the magnetic field module of the finite element model.

[0085] The inter-turn capacitance can be understood as the capacitance between the turns of the conductors adjacent to each other in the winding of the inductor or transformer, the inter-disk capacitance can be understood as the capacitance between different layers or different disks, and the geometric capacitance can be understood as the geometric capacitance between high-voltage and low-voltage, high-voltage and oil tank, etc.

[0086] Optionally, the server 104 obtains the inter-turn capacitance, the inter-disk capacitance and the geometric capacitance of each sub-winding matched with the current transformer winding deformation condition through the electric field module of the finite element model, obtains the equivalent longitudinal capacitance of each sub-winding according to the inter-turn capacitance and the inter-disk capacitance, obtains the ground capacitance of each sub-winding based on the geometric capacitance, and obtains the inductance of each sub-winding by using the magnetic field module of the finite element model. The circuit model parameters of the current winding circuit model are obtained by the finite element model, which greatly reduces the technical difficulty of obtaining the related circuit model parameters.

[0087] In one of the embodiments, the similarity between the simulation sweep frequency result and the actual sweep frequency result of the target transformer is obtained by: obtaining the peak similarity between the peaks of the simulation sweep frequency result and the peaks of the actual sweep frequency result, the valley similarity between the valleys of the simulation sweep frequency result and the valleys of the actual sweep frequency result, and the partial similarity between the remaining part of the simulation sweep frequency result and the remaining part of the actual sweep frequency result; obtaining the first weight corresponding to the pre-set peak similarity, the second weight corresponding to the pre-set valley similarity, and the third weight corresponding to the pre-set partial similarity; and weighting the peak similarity, the valley similarity and the partial similarity according to the first weight, the second weight and the third weight to obtain the similarity.

[0088] For example, the server 104 obtains the peak similarity between the peaks of the simulation sweep frequency result and the peaks of the actual sweep frequency result, the valley similarity between the valleys of the simulation sweep frequency result and the valleys of the actual sweep frequency result, and the partial similarity between the remaining part of the simulation sweep frequency result and the remaining part of the actual sweep frequency result, continues to obtain the first weight corresponding to the pre-set peak similarity, the second weight corresponding to the pre-set valley similarity, and the third weight corresponding to the pre-set partial similarity, and finally weights the peak similarity, the valley similarity and the partial similarity according to the first weight, the second weight and the third weight to obtain the similarity. By weighting the peak similarity, the valley similarity and the partial similarity, a more comprehensive similarity can be obtained, which can better reflect the similarity between the simulation sweep frequency result and the actual sweep frequency result, and through such calculation, the resource cost of the inspection can be saved, and the inspection accuracy for the hidden faults can be improved.

[0089] In an exemplary embodiment, after obtaining the similarity degree between the simulation sweep frequency result and the actual sweep frequency result of the target transformer, further comprising: in the case that the similarity degree is not greater than the pre-recorded maximum similarity degree, canceling recording the similarity degree as a new maximum similarity degree.

[0090] Optionally, in the case that the similarity degree is not greater than the pre-recorded maximum similarity degree, canceling recording the similarity degree as a new maximum similarity degree, in the case that the traversal of each transformer winding deformation condition is not completed, taking any untraversed transformer winding deformation condition as a new current transformer winding deformation condition, and returning to execute the step of setting the current transformer winding deformation condition in the finite element model of the target transformer 102 pre-constructed until the traversal of each transformer winding deformation condition is completed, in the case that the traversal of each transformer winding deformation condition is completed, taking the transformer winding deformation condition corresponding to the maximum similarity degree as the transformer winding deformation condition of the target transformer. Effectively traversing each transformer winding deformation condition avoids omission, and taking the transformer winding deformation condition corresponding to the maximum similarity degree as the transformer winding deformation condition of the target transformer 102 improves the output credibility of the transformer winding deformation condition of the target transformer.

[0091] In an embodiment, before the target transformer appears transformer winding deformation, comprising: obtaining the circuit model parameters of the target transformer, and constructing a circuit model of the target transformer according to the circuit model parameters; performing sweep frequency simulation on the circuit model to obtain a first simulation sweep frequency result of the circuit model; obtaining a similarity degree between the first simulation sweep frequency result and an actual sweep frequency result, and in the case that the similarity degree is greater than a preset similarity degree threshold, determining that the target transformer passes the search condition test by performing transformer winding deformation condition search.

[0092] For example, before the server 104 obtains the current transformer winding deformation condition, the server 104 first obtains the circuit model parameters of the target transformer, constructs the circuit model of the target transformer according to the circuit model parameters, performs sweep frequency simulation on the circuit model, obtains the first simulation sweep frequency result of the circuit model, and finally obtains the similarity between the first simulation sweep frequency result and the actual sweep frequency result. When the similarity is greater than the preset similarity threshold, that is, the similarity between the circuit model after modeling and the actual transformer meets the accuracy requirement, and the above test process is performed when the target transformer 102 is in the state of no winding change, the transformer winding deformation condition of the target transformer 102 can be determined by setting the transformer winding deformation condition in the finite element model of the target transformer 102. In the normal state of the target transformer, the modeling and sweep frequency performance test are performed, which avoids the defect that the performance test cannot be performed when the transformer winding deformation of the target transformer occurs, and saves the subsequent modeling and search cost.

[0093] In one exemplary embodiment, as shown in Figure 4 , a flowchart of a specific implementation of transformer winding deformation condition search is provided, wherein:

[0094] Steps 1-3 calculate the capacitance parameters after winding deformation:

[0095] The analytical formula method can only calculate the capacitance parameters of the normal winding. Once the winding is deformed, it is difficult to obtain the capacitance parameters. Therefore, the electric field module based on the finite element model is used to calculate the capacitance parameters of the transformer winding. First, the inter-turn capacitance and the inter-pie capacitance of each sub-winding are calculated, and then the equivalent longitudinal capacitance is derived based on the principle of equal energy. The total ground capacitance is calculated by calculating the geometric capacitance of high-voltage-low-voltage, high-voltage-oil tank, etc.

[0096] Steps 4-5 calculate the inductance parameters after winding deformation and establish a circuit model:

[0097] Similarly, based on the finite element model, the inductance parameters of each sub-winding of the transformer are calculated by setting the deformation on the geometric structure and using the magnetic field module. After obtaining the model parameters, based on the actual electromagnetic connection relationship of the winding, each sub-winding is connected in series and connected to the input voltage, input resistance and output resistance to form a complete winding circuit model. The winding circuit model is as shown in Figure 5 , wherein: k represents the number of each sub-winding (k=1, 2, 3,..., n), K i is the equivalent longitudinal capacitance of the i-th sub-winding, C i is the ground capacitance of the i-th sub-winding, L i is the inductance of the i-th sub-winding, V inVin represents the input voltage, V out Vout represents the output voltage, R i Rin represents the input resistance, R o Rout represents the output resistance.

[0098] Step 6-Step 9: Compare the sweep frequency results of the actual winding and the circuit model:

[0099] Based on the circuit model constructed in steps 1-5, carry out sweep frequency to obtain the sweep frequency results of the winding deformation, compare the sweep frequency results of the circuit model with the sweep frequency results of the actual winding, especially the wave crest and trough, calculate the similarity of the two waveforms. If the similarity is higher than the deformation condition previously judged as the search result, update the search result; otherwise, directly judge whether all deformation conditions have been traversed. If all deformation conditions have been traversed, output the search result; otherwise, return to step 1 to calculate the model parameters of the next winding deformation condition, construct the circuit model to carry out sweep frequency, and calculate the sweep frequency result similarity, until all deformation conditions are traversed.

[0100] The complete workflow is: based on the model parameters of the winding deformation calculated by the finite element model, construct the winding circuit model to carry out sweep frequency, calculate the similarity of the sweep frequency results with the actual winding, and take the one with the highest similarity among all deformation conditions as the final search result.

[0101] Compared with the prior art, the present application has the following advantages:

[0102] (1) Based on the physical structure of the transformer, a finite element model is established, the deformation calculation circuit model parameters are set in the finite element model, and the search result is locked through traversal simulation, without the need to disassemble the device entity, saving manpower and material resources, and avoiding the possibility of secondary damage.

[0103] (2) Based on the circuit model to carry out sweep frequency simulation, compared with the finite element model, the simulation efficiency is improved under the condition of ensuring accuracy.

[0104] (3) The circuit model modeling method is simple, which is constructed by the basic elements in the software, and different transformer winding deformation conditions only need to change the model parameters, with high universality.

[0105] It should be understood that although the steps in the flowcharts involved in the embodiments described above are shown in sequence according to the arrows, the steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, the execution of the steps is not strictly limited in sequence, and the steps can be executed in other orders. Moreover, at least some of the steps in the flowcharts involved in the embodiments described above can include multiple steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of the steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least part of other steps or steps or stages in other steps.

[0106] Based on the same inventive concept, the embodiments of the present application also provide a transformer winding deformation condition searching device for implementing the above-mentioned transformer winding deformation condition searching method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, so the specific limitations in one or more transformer winding deformation condition searching device embodiments provided below can refer to the limitations of the transformer winding deformation condition searching method described above, which will not be repeated here.

[0107] In one exemplary embodiment, as shown in Figure 6 A transformer winding deformation condition searching device is provided, comprising: a first acquisition module 601, a sweep frequency module 602, a second acquisition module 603, a traversal module 604 and an output module 605, wherein:

[0108] The first acquisition module 601 is configured to acquire the current transformer winding deformation condition, and set the current transformer winding deformation condition in the pre-constructed finite element model of the target transformer to obtain circuit model parameters matched with the current transformer winding deformation condition;

[0109] The sweep frequency module 602 is configured to construct a current winding circuit model corresponding to the current transformer winding deformation condition according to the circuit model parameters, and perform sweep frequency simulation on the current winding circuit model to obtain a simulation sweep frequency result of the current winding circuit model;

[0110] The second acquisition module 603 is configured to acquire the similarity between the simulation sweep frequency result and the actual sweep frequency result of the target transformer, and record the similarity as a new maximum similarity if the similarity is greater than a pre-recorded maximum similarity;

[0111] The traversal module 604 is configured to, in a case where the traversal of the transformer winding deformation conditions is not completed, take any untraversed transformer winding deformation condition as a new current transformer winding deformation condition, and return to execute the step of setting the current transformer winding deformation condition in the pre-constructed finite element model of the target transformer until the traversal of the transformer winding deformation conditions is completed.

[0112] The output module 605 is configured to, in a case where the traversal of the transformer winding deformation conditions is completed, take the transformer winding deformation condition corresponding to the recorded maximum similarity degree as the transformer winding deformation condition of the target transformer.

[0113] In an embodiment, the circuit model parameters include equivalent longitudinal capacitance, ground capacitance and inductance, and the sweep module 602 is further configured to construct a plurality of sub-windings according to the equivalent longitudinal capacitance, the ground capacitance and the inductance, obtain the electromagnetic connection relationship between the sub-windings, and the input voltage, the input resistance and the output resistance, connect the sub-windings by using the electromagnetic connection relationship, and combine the input voltage, the input resistance and the output resistance to construct a current winding circuit model corresponding to the current transformer winding deformation condition.

[0114] In an embodiment, the finite element model includes an electric field module and a magnetic field module, and the first obtaining module 601 is further configured to obtain, by using the electric field module of the finite element model, the turn-to-turn capacitance, the disk-to-disk capacitance and the geometric capacitance of each sub-winding matched with the current transformer winding deformation condition, obtain the equivalent longitudinal capacitance of each sub-winding according to the turn-to-turn capacitance and the disk-to-disk capacitance, and obtain the ground capacitance of each sub-winding based on the geometric capacitance, and obtain the inductance of each sub-winding by using the magnetic field module of the finite element model.

[0115] In an embodiment, the second obtaining module 603 is further configured to obtain a peak similarity degree between the peak of the simulation sweep result and the peak of the actual sweep result, a valley similarity degree between the valley of the simulation sweep result and the valley of the actual sweep result, and a partial similarity degree between the remaining part of the simulation sweep result and the remaining part of the actual sweep result, obtain a first weight corresponding to the pre-set peak similarity degree, a second weight corresponding to the pre-set valley similarity degree, and a third weight corresponding to the pre-set partial similarity degree, and weight the peak similarity degree, the valley similarity degree and the partial similarity degree according to the first weight, the second weight and the third weight to obtain the similarity degree.

[0116] In an embodiment, the second obtaining module 603 is further configured to, in a case where the similarity degree is not greater than the pre-recorded maximum similarity degree, cancel the recording of the similarity degree as a new maximum similarity degree.

[0117] In one of the embodiments, before the transformer winding deformation occurs in the target transformer, the transformer winding deformation condition searching device further comprises a pre-test module configured to obtain circuit model parameters of the target transformer, and construct a circuit model of the target transformer according to the circuit model parameters; perform sweep simulation on the circuit model to obtain a first simulation sweep result of the circuit model; obtain a similarity degree between the first simulation sweep result and an actual sweep result, and determine that the target transformer passes the search condition test of the transformer winding deformation condition searching in a case where the similarity degree is greater than a preset similarity degree threshold.

[0118] The modules in the transformer winding deformation condition searching device described above can be implemented by software, hardware, or a combination thereof, in whole or in part. The modules described above can be embedded in or independent of a processor in a computer device in hardware form, or stored in a memory in a computer device in software form, so as to be called and executed by a processor to perform the operations corresponding to the modules.

[0119] In one exemplary embodiment, a computer device, which can be a server, is provided, and an internal structure diagram of the computer device can be as shown in Figure 7 The computer device includes a processor, a memory, an input / output interface (I / O), and a communication interface. The processor, the memory, and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operating system and the computer program in the non-volatile storage medium to run. The database of the computer device is configured to store current transformer winding deformation conditions, finite element models of target transformers, circuit model parameters, simulation sweep results, actual sweep results, and similarity degree data. The input / output interface of the computer device is configured to exchange information between the processor and external devices. The communication interface of the computer device is configured to communicate with terminals outside through a network connection. The computer program is executed by the processor to implement a transformer winding deformation condition searching method.

[0120] Those skilled in the art can understand that Figure 7 The structure shown in the above

[0121] In an example embodiment, a computer device is provided, comprising a memory and a processor, the memory storing a computer program, and the processor implementing the transformer winding deformation condition searching method of the above-mentioned embodiments when executing the computer program.

[0122] In an example embodiment, a computer readable storage medium is provided, storing a computer program, and the computer program implementing the transformer winding deformation condition searching method of the above-mentioned embodiments when executed by a processor.

[0123] In an example embodiment, a computer program product is provided, comprising a computer program, and the computer program implementing the transformer winding deformation condition searching method of the above-mentioned embodiments when executed by a processor.

[0124] It should be noted that the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of related data need to comply with relevant regulations.

[0125] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when executed, can include the processes of the above-mentioned embodiment methods. Any reference to memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. The non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. The volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration but not limitation, the RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., without being limited thereto.

[0126] The technical features of the above embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0127] The above-described embodiments are merely illustrative of several embodiments of the present application, and the description is relatively specific and detailed, but should not be understood as a limitation on the scope of the patent. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A method for searching for transformer winding deformation, characterized in that: The method comprises: Obtaining a current transformer winding deformation condition, and setting the current transformer winding deformation condition in a pre-built finite element model of a target transformer to obtain circuit model parameters that match the current transformer winding deformation condition; Constructing a current winding circuit model corresponding to the current transformer winding deformation according to the circuit model parameters, and performing a frequency sweep simulation on the current winding circuit model to obtain a simulation frequency sweep result of the current winding circuit model; Obtaining a peak similarity between a peak of the simulated frequency sweep result and a peak of an actual frequency sweep result of the target transformer, a trough similarity between a trough of the simulated frequency sweep result and a trough of the actual frequency sweep result, and a partial similarity between a remaining portion of the simulated frequency sweep result and a remaining portion of the actual frequency sweep result; obtaining a preset first weight corresponding to the peak similarity, a preset second weight corresponding to the trough similarity, and a preset third weight corresponding to the partial similarity; weighting the peak similarity, the trough similarity, and the partial similarity according to the first weight, the second weight, and the third weight to obtain a similarity between the simulated frequency sweep result and the actual frequency sweep result, and if the similarity is greater than a pre-recorded maximum similarity, recording the similarity as a new maximum similarity; In the case that the traversal of the deformation conditions of the transformer windings has not been completed, any untraversed transformer winding deformation condition is used as a new current transformer winding deformation condition, and the step of setting the current transformer winding deformation condition in the pre-built finite element model of the target transformer is returned to execute until the traversal of the deformation conditions of the transformer windings is completed; When the traversal of the deformation conditions of each transformer winding is completed, the transformer winding deformation condition corresponding to the maximum similarity degree is recorded as the transformer winding deformation condition of the target transformer.

2. The method according to claim 1, characterized in that The circuit model parameters include equivalent longitudinal capacitance, capacitance to ground and inductance; The step of constructing a current winding circuit model corresponding to the current transformer winding deformation condition according to the circuit model parameters includes: constructing a plurality of sub-windings according to the equal-value longitudinal capacitance, the capacitance to ground, and the inductance; Obtaining the electromagnetic connection relationship between the sub-windings, as well as the input voltage, input resistance, and output resistance; The sub-windings are connected using the electromagnetic connection relationship, and the input voltage, the input resistance, and the output resistance are combined to construct a current winding circuit model corresponding to the current transformer winding deformation condition.

3. The method according to claim 2, characterized in that The finite element model includes an electric field module and a magnetic field module; The step of setting the current transformer winding deformation condition in a pre-built finite element model of a target transformer to obtain circuit model parameters matching the current transformer winding deformation condition includes: Obtaining, through the electric field module of the finite element model, the inter-turn capacitance, inter-panel capacitance, and geometric capacitance of each sub-winding that match the current transformer winding deformation, obtaining the equivalent longitudinal capacitance of each sub-winding based on the inter-turn capacitance and inter-panel capacitance, and obtaining the capacitance to ground of each sub-winding based on the geometric capacitance; The inductance of each sub-winding is obtained through the magnetic field module of the finite element model.

4. The method according to claim 1, wherein After obtaining the similarity between the simulation frequency sweep result and the actual frequency sweep result of the target transformer, the method further includes: In a case where the degree of similarity is not greater than the pre-recorded maximum degree of similarity, the recording of the degree of similarity as a new maximum degree of similarity is canceled.

5. The method according to claim 1, wherein Before the target transformer experiences transformer winding deformation, the method includes: Acquiring circuit model parameters of the target transformer, and constructing a circuit model of the target transformer according to the circuit model parameters; Performing a frequency sweep simulation on the circuit model to obtain a first simulation frequency sweep result of the circuit model; The similarity between the first simulation frequency sweep result and the actual frequency sweep result is obtained, and when the similarity is greater than a preset similarity threshold, it is determined that the target transformer passes the search condition test for searching for transformer winding deformation conditions.

6. A transformer winding deformation search device, characterized in that: The device comprises: A first acquisition module is used to obtain a current transformer winding deformation condition and set the current transformer winding deformation condition in a pre-built finite element model of a target transformer to obtain circuit model parameters that match the current transformer winding deformation condition; a frequency sweep module, configured to construct a current winding circuit model corresponding to the current transformer winding deformation according to the circuit model parameters, and perform a frequency sweep simulation on the current winding circuit model to obtain a simulation frequency sweep result of the current winding circuit model; a second acquisition module, configured to acquire a peak similarity between a peak of the simulated frequency sweep result and a peak of an actual frequency sweep result of the target transformer, a trough similarity between a trough of the simulated frequency sweep result and a trough of the actual frequency sweep result, and a partial similarity between a remaining portion of the simulated frequency sweep result and a remaining portion of the actual frequency sweep result; acquire a preset first weight corresponding to the peak similarity, a preset second weight corresponding to the trough similarity, and a preset third weight corresponding to the partial similarity; weight the peak similarity, the trough similarity, and the partial similarity according to the first weight, the second weight, and the third weight to obtain a similarity between the simulated frequency sweep result and the actual frequency sweep result, and if the similarity is greater than a pre-recorded maximum similarity, record the similarity as a new maximum similarity; A traversal module is used to, when the traversal of the deformation conditions of each transformer winding is not completed, use any untraversed transformer winding deformation condition as a new current transformer winding deformation condition, and return to execute the step of setting the current transformer winding deformation condition in the pre-built finite element model of the target transformer until the traversal of the deformation conditions of each transformer winding is completed; The output module is used to use the transformer winding deformation condition corresponding to the maximum similarity recorded as the transformer winding deformation condition of the target transformer when the traversal of the deformation conditions of each transformer winding is completed.

7. The device according to claim 6, characterized in that The circuit model parameters include equivalent longitudinal capacitance, capacitance to ground, and inductance; the device further includes: The frequency scanning module is further used to construct multiple sub-windings based on the equivalent longitudinal capacitance, the ground capacitance and the inductance; obtain the electromagnetic connection relationship between each of the sub-windings, as well as the input voltage, input resistance and output resistance; use the electromagnetic connection relationship to connect each of the sub-windings, and combine the input voltage, the input resistance and the output resistance to construct a current winding circuit model corresponding to the current transformer winding deformation condition.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

10. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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