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

Abstract

The invention relates to a transformer winding deformation condition searching method and device, computer equipment and a medium. The method comprises the steps of setting a current winding deformation condition in a finite element model of a target transformer to obtain circuit model parameters and construct a corresponding current circuit model, performing frequency sweep simulation on the current circuit model to obtain a simulation frequency sweep result, obtaining a similarity degree between the simulation frequency sweep result and an actual frequency sweep result, and calculating a current winding deformation condition according to the similarity degree. And when the similarity degree is greater than a pre-recorded maximum similarity degree, recording the similarity degree as a new maximum similarity degree, and when the traversal is not completed, taking any non-traversed winding deformation condition as a new current winding deformation condition, and returning to execute the step of setting the current winding deformation condition until the traversal is completed. And under the condition that traversal is completed, taking the winding deformation condition corresponding to the maximum similarity degree as the winding deformation condition of the target transformer. And 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 search method, device, computer equipment, computer-readable storage medium and computer program product. Background Art

[0002] Transformers are vital core equipment in power systems, and their safe and stable operation is the cornerstone of reliable operation of new power systems. Transformer winding deformation refers to irreversible changes in the size or shape of the winding under the action of electrodynamic and mechanical forces. As the deformation of the winding intensifies, its tolerance decreases, so it is easy to deform slightly in the case of overcurrent. Slight deformation of the winding will cause local damage to its insulation, local discharge, and further aggravate insulation aging. As the slight deformation of the winding and insulation aging continue to intensify, once a serious external short circuit occurs, the winding may be severely deformed, directly damaging the transformer, and may even cause the transformer to stop operating, resulting in large-scale power outages. At present, after the transformer is subjected to the impact of short-circuit current, a hanging cover is usually used to check whether the winding is deformed and the pads are loose.

[0003] However, the current method of detecting hanging covers has the risk of secondary damage. Summary of the invention

[0004] Based on this, it is necessary to provide a method, device, computer equipment, computer-readable storage medium and computer program product for searching transformer winding deformation conditions to avoid secondary damage in order to solve the above technical problems.

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

[0006] Obtaining the 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 matching 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 is constructed, and a frequency sweep simulation is performed on the current winding circuit model to obtain a simulation frequency sweep result of the current winding circuit model;

[0008] Obtaining the similarity between the simulated frequency sweep result and the actual frequency sweep result of the target transformer, and if the similarity is greater than the maximum similarity recorded in advance, recording the similarity as a new maximum similarity;

[0009] In the case that the deformation conditions of each transformer winding have not been traversed, any deformation condition of the transformer winding that has not been traversed is used as a new current deformation condition of the transformer winding, and the step of setting the current transformer winding deformation condition in the finite element model of the pre-constructed target transformer is returned to execute until the deformation conditions of each transformer winding are traversed;

[0010] When the traversal of the deformation conditions of each transformer winding is completed, the transformer winding deformation condition corresponding to the maximum similarity degree recorded is used as the transformer winding deformation condition of the target transformer.

[0011] In one embodiment, the circuit model parameters include equal-value longitudinal capacitance, capacitance to ground, and inductance;

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

[0013] Constructing multiple sub-windings according to equal longitudinal capacitance, capacitance to ground and inductance;

[0014] Obtaining the electromagnetic connection relationship between each sub-winding, as well as the input voltage, input resistance and output resistance;

[0015] The sub-windings are connected using electromagnetic connection relationships, and the input voltage, input resistance, and output resistance are combined to construct a current winding circuit model corresponding to the current transformer winding deformation.

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

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

[0018] The inter-turn capacitance, inter-panel capacitance and geometric capacitance of each sub-winding matching the current transformer winding deformation are obtained through the electric field module of the finite element model. The equivalent longitudinal capacitance of each sub-winding is obtained based on the inter-turn capacitance and inter-panel capacitance, and the capacitance to ground 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, obtaining the similarity between the simulated frequency sweep result and the actual frequency sweep result of the target transformer includes:

[0021] Obtaining the similarity between the peaks of the simulated frequency sweep result and the peaks of the actual frequency sweep result, the similarity between the troughs of the simulated frequency sweep result and the troughs of the actual frequency sweep result, and the similarity between the rest of the simulated frequency sweep result and the rest of the actual frequency sweep result;

[0022] Obtaining a first weight corresponding to a preset peak similarity, a second weight corresponding to a preset trough similarity, and a third weight corresponding to a preset partial similarity;

[0023] The peak similarity, the trough similarity and the partial similarity are weighted according to the first weight, the second weight and the third weight to obtain the similarity.

[0024] In an exemplary embodiment, after obtaining the similarity between the simulated frequency sweep result and the actual frequency sweep result of the target transformer, the method further includes:

[0025] In the 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.

[0026] In one embodiment, before the transformer winding deformation occurs in the target transformer, the method includes:

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

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

[0029] 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 the transformer winding deformation condition.

[0030] In a second aspect, the present application also provides a transformer winding deformation condition searching device, comprising:

[0031] A first acquisition module is used to acquire the 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 matching the current transformer winding deformation condition;

[0032] A frequency sweep module is used 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;

[0033] A second acquisition module is used to obtain the similarity between the simulated frequency sweep result and the actual frequency sweep result of the target transformer, and when the similarity is greater than the pre-recorded maximum similarity, the similarity is recorded as a new maximum similarity;

[0034] A traversal module, used for, when the traversal of the deformation conditions of each transformer winding 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 pre-built target transformer until the traversal of the deformation conditions of each transformer winding is completed;

[0035] 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 transformer winding deformation conditions is completed.

[0036] In a third aspect, the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0037] Obtaining the 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 matching the current transformer winding deformation condition;

[0038] According to the circuit model parameters, a current winding circuit model corresponding to the current transformer winding deformation is constructed, and a frequency sweep simulation is performed on the current winding circuit model to obtain a simulation frequency sweep result of the current winding circuit model;

[0039] Obtaining the similarity between the simulated frequency sweep result and the actual frequency sweep result of the target transformer, and if the similarity is greater than the maximum similarity recorded in advance, recording the similarity as a new maximum similarity;

[0040] In the case that the deformation conditions of each transformer winding have not been traversed, any deformation condition of the transformer winding that has not been traversed is used as a new current deformation condition of the transformer winding, and the step of setting the current transformer winding deformation condition in the finite element model of the pre-constructed target transformer is returned to execute until the deformation conditions of each transformer winding are traversed;

[0041] When the traversal of the deformation conditions of each transformer winding is completed, the transformer winding deformation condition corresponding to the maximum similarity degree recorded is used 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 having a computer program stored thereon, and when the computer program is executed by a processor, the following steps are implemented:

[0043] Obtaining the 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 matching the current transformer winding deformation condition;

[0044] According to the circuit model parameters, a current winding circuit model corresponding to the current transformer winding deformation is constructed, and a frequency sweep simulation is performed on the current winding circuit model to obtain a simulation frequency sweep result of the current winding circuit model;

[0045] Obtaining the similarity between the simulated frequency sweep result and the actual frequency sweep result of the target transformer, and if the similarity is greater than the maximum similarity recorded in advance, recording the similarity as a new maximum similarity;

[0046] In the case that the deformation conditions of each transformer winding have not been traversed, any deformation condition of the transformer winding that has not been traversed is used as a new current deformation condition of the transformer winding, and the step of setting the current transformer winding deformation condition in the finite element model of the pre-constructed target transformer is returned to execute until the deformation conditions of each transformer winding are traversed;

[0047] When the traversal of the deformation conditions of each transformer winding is completed, the transformer winding deformation condition corresponding to the maximum similarity degree recorded is used as the transformer winding deformation condition of the target transformer.

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

[0049] Obtaining the 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 matching the current transformer winding deformation condition;

[0050] According to the circuit model parameters, a current winding circuit model corresponding to the current transformer winding deformation is constructed, and a frequency sweep simulation is performed on the current winding circuit model to obtain a simulation frequency sweep result of the current winding circuit model;

[0051] Obtaining the similarity between the simulated frequency sweep result and the actual frequency sweep result of the target transformer, and if the similarity is greater than the maximum similarity recorded in advance, recording the similarity as a new maximum similarity;

[0052] In the case that the deformation conditions of each transformer winding have not been traversed, any deformation condition of the transformer winding that has not been traversed is used as a new current deformation condition of the transformer winding, and the step of setting the current transformer winding deformation condition in the finite element model of the pre-constructed target transformer is returned to execute until the deformation conditions of each transformer winding are traversed;

[0053] When the traversal of the deformation conditions of each transformer winding is completed, the transformer winding deformation condition corresponding to the maximum similarity degree recorded is used as the transformer winding deformation condition of the target transformer.

[0054] The transformer winding deformation condition search method, device, computer equipment, computer-readable storage medium and computer program product obtain the current transformer winding deformation condition and set the current transformer winding deformation condition in a pre-constructed finite element model of the target transformer to obtain circuit model parameters matching 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 a frequency sweep simulation is performed on the current winding circuit model to obtain a simulation frequency sweep result of the current winding circuit model. The degree of similarity between the simulation frequency sweep result and the actual frequency sweep result of the target transformer is obtained, and when the degree of similarity is greater than the maximum similarity recorded in advance, the degree of similarity is recorded as a new maximum similarity. When the deformation conditions of each transformer winding have not been traversed, any transformer winding deformation condition that has not been traversed is used as the 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 deformation conditions of each transformer winding are traversed. When the deformation conditions of each transformer winding are traversed, the transformer winding deformation condition corresponding to the recorded maximum similarity is used as the transformer winding deformation condition of the target transformer. By constructing the current winding circuit model to traverse and search to finally determine the winding deformation of the transformer, there is no need to dismantle the transformer to check the winding deformation, thereby avoiding the risk of secondary damage to the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0056] FIG1 is an application environment diagram of a transformer winding deformation condition searching method in one embodiment;

[0057] FIG2 is a schematic flow chart of a method for searching for transformer winding deformation conditions in one embodiment;

[0058] FIG3 is a schematic diagram of a process of constructing a current winding circuit model in one embodiment;

[0059] FIG4 is a schematic flow chart of a transformer winding deformation search method in another embodiment;

[0060] FIG5 is a schematic diagram of the structure of a current winding circuit model in one embodiment;

[0061] FIG6 is a structural block diagram of a transformer winding deformation searching device in one embodiment;

[0062] FIG. 7 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0064] The transformer winding deformation search method provided in the embodiment of the present application can be applied in the application environment shown in FIG1. ​​The target transformer 102 communicates with the server 104 via a network. The data storage system can store data that the server 104 needs to process. The data storage system can be integrated on the server 104, or it can be 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 a pre-constructed finite element model of the target transformer to obtain a circuit model parameter matching the current transformer winding deformation condition, constructs a current winding circuit model corresponding to the current transformer winding deformation condition according to the circuit model parameter, performs a frequency sweep simulation on the current winding circuit model, obtains a simulation frequency sweep result of the current winding circuit model, obtains a similarity between the simulation frequency sweep result and an actual frequency sweep result of the target transformer, and when the similarity is greater than a pre-recorded maximum similarity, records the similarity as a new maximum similarity, and when the traversal of each transformer winding deformation condition is not completed, any transformer winding deformation condition that has not been traversed is used as a new current transformer winding deformation condition, and returns 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 each transformer winding deformation condition is completed, and finally, when the traversal of each transformer winding deformation condition is completed, the transformer winding deformation condition corresponding to the recorded maximum similarity is used as the transformer winding deformation condition of the target transformer. The server 104 may be an independent physical server, a server cluster or a distributed system composed of multiple physical servers, or a cloud server that provides cloud computing services.

[0065] In an exemplary embodiment, as shown in FIG2 , a transformer winding deformation condition search method is provided, and the method is applied to the server 104 in FIG1 as an example for description, 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 a pre-built finite element model of a target transformer to obtain circuit model parameters matching the current transformer winding deformation condition.

[0067] Among them, the deformation of the transformer winding can be understood as the change in 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 can be understood as the change in the transformer winding geometry simulated by the server itself, rather than the actual change; the finite element model can be understood as a numerical calculation model used to analyze and simulate transformer performance, which is an analysis model formed by 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-built finite element model of the target transformer 102 to obtain circuit model parameters that match the current transformer winding deformation condition. By setting the current transformer winding deformation condition in the finite element model of the target transformer 102, circuit model parameters under various deformation conditions can be obtained, laying a data foundation for subsequently constructing a corresponding current winding circuit model according to the circuit model parameters.

[0069] Step S202: 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.

[0070] Step S203, obtaining the similarity between the simulation frequency sweep result and the actual frequency sweep result of the target transformer, and if the similarity is greater than the pre-recorded maximum similarity, recording the similarity as a new maximum similarity.

[0071] The winding circuit model can be understood as a conventional circuit model including windings, and the frequency sweep 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 according to the circuit model parameters, and performs a frequency sweep simulation on the current winding circuit model to obtain the simulation frequency sweep result of the current winding circuit model, and obtains the similarity between the simulation frequency sweep result and the actual frequency sweep result of the target transformer 102, and records the similarity as the new maximum similarity when the similarity is greater than the pre-recorded maximum similarity. By obtaining the similarity between the simulation frequency sweep result and the actual frequency sweep result, and recording the current similarity as the new maximum similarity when the similarity obtained this time is greater than the pre-recorded maximum similarity, the timely update of the maximum similarity is ensured, and the accuracy of determining the transformer winding deformation is further ensured.

[0073] Step S204, when the traversal of the deformation conditions of each transformer winding is not completed, any transformer winding deformation condition that has not been traversed is used as the 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 each transformer winding is completed.

[0074] Step S205, 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.

[0075] For example, when the traversal of the deformation conditions of each transformer winding is not completed, any transformer winding deformation condition that has not been traversed is used as the new current transformer winding deformation condition, and the step of setting the current transformer winding deformation condition in the finite element model of the pre-built target transformer 102 is returned to execute until the traversal of the deformation conditions of each transformer winding is completed. Secondly, when the traversal of the deformation conditions of each transformer winding is completed, the transformer winding deformation condition corresponding to the maximum similarity recorded is used as the transformer winding deformation condition of the target transformer. All possible transformer winding deformation conditions of the transformer need to be traversed to avoid the omission of any transformer winding deformation condition, which results in the maximum similarity finally determined not being the maximum similarity, thereby improving the accuracy of determining the transformer winding deformation condition of the target transformer.

[0076] In the above transformer winding deformation search method, the current transformer winding deformation is obtained and the current transformer winding deformation is set in the pre-constructed finite element model of the target transformer to obtain circuit model parameters matching the current transformer winding deformation. According to the circuit model parameters, a current winding circuit model corresponding to the current transformer winding deformation is constructed, and a frequency sweep simulation is performed on the current winding circuit model to obtain a simulation frequency sweep result of the current winding circuit model. The similarity between the simulation frequency sweep result and the actual frequency sweep result of the target transformer is obtained, and when the similarity is greater than the pre-recorded maximum similarity, the similarity is recorded as a new maximum similarity. When the traversal of each transformer winding deformation is not completed, any transformer winding deformation that has not been traversed is used as the new current transformer winding deformation, and the step of setting the current transformer winding deformation in the pre-constructed finite element model of the target transformer is returned to execute until the traversal of each transformer winding deformation is completed. When the traversal of each transformer winding deformation is completed, the transformer winding deformation corresponding to the recorded maximum similarity is used as the transformer winding deformation of the target transformer. By constructing the current winding circuit model to traverse and search to finally determine the winding deformation of the transformer, there is no need to dismantle the transformer to check the winding deformation, thereby avoiding the risk of secondary damage to the transformer.

[0077] In an exemplary embodiment, the circuit model parameters include equal longitudinal capacitance, capacitance to ground and inductance, as shown in FIG3 , according to the circuit model parameters, a current winding circuit model corresponding to the current transformer winding deformation is constructed, including steps S301 to S303. Wherein:

[0078] Step S301 , constructing a plurality of sub-windings according to equal longitudinal capacitance, capacitance to ground and inductance.

[0079] Step S302, obtaining the electromagnetic connection relationship between the sub-windings, as well as the input voltage, input resistance and output resistance.

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

[0081] Optionally, the server 104 constructs multiple sub-windings using equal longitudinal capacitance, capacitance to ground and inductance, and obtains the electromagnetic connection relationship between the sub-windings, as well as the input voltage, input resistance and output resistance that together constitute the current winding circuit model, laying a data foundation for the subsequent construction of the current winding circuit model.

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

[0083] For example, the server 104 uses an electromagnetic connection relationship to connect the ends of each sub-winding, and connects the input voltage, input resistance and output resistance to construct a current winding circuit model corresponding to the current transformer winding deformation. By separating each sub-winding independently, it is convenient to adjust the circuit model parameters of each winding when the transformer winding deformation changes, thereby reducing the operational 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 is set in the pre-constructed finite element model of the target transformer to obtain circuit model parameters matching the current transformer winding deformation, including: obtaining the turn-to-turn capacitance, pancake capacitance and geometric capacitance of each sub-winding matching the current transformer winding deformation through the electric field module of the finite element model, obtaining the equivalent longitudinal capacitance of each sub-winding according to the turn-to-turn capacitance and pancake capacitance, and obtaining the capacitance to ground 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] Among them, the inter-turn capacitance can be understood as the capacitance formed between adjacent conductor turns in the winding of an inductor or transformer, the inter-cake capacitance can be understood as the capacitance formed between different layers or different cakes, and the geometric capacitance can be understood as geometric capacitance such as high voltage-low voltage, high voltage-oil tank, etc.

[0086] Optionally, the server 104 obtains the turn-to-turn capacitance, pancake capacitance, and geometric capacitance of each sub-winding that matches the current transformer winding deformation through the electric field module of the finite element model, obtains the equivalent longitudinal capacitance of each sub-winding based on the turn-to-turn capacitance and the pancake capacitance, and obtains the capacitance to ground of each sub-winding based on the geometric capacitance, and simultaneously obtains the inductance of each sub-winding using the magnetic field module of the finite element model. Obtaining the circuit model parameters for constructing the current winding circuit model through the finite element model greatly reduces the technical difficulty of obtaining the relevant circuit model parameters.

[0087] In one embodiment, obtaining the similarity between the simulated frequency sweep result and the actual frequency sweep result of the target transformer includes: obtaining the peak similarity between the peak of the simulated frequency sweep result and the peak of the actual frequency sweep result, the trough similarity between the trough of the simulated frequency sweep result and the trough of the actual frequency sweep result, and the partial similarity between the rest of the simulated frequency sweep result and the rest of the actual frequency sweep result; obtaining a first weight corresponding to a preset peak similarity, a second weight corresponding to a preset trough similarity, and a third weight corresponding to a preset 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 the similarity.

[0088] For example, the server 104 obtains the peak similarity between the peak of the simulated frequency sweep result and the peak of the actual frequency sweep result, as well as the trough similarity between the trough of the simulated frequency sweep result and the trough of the actual frequency sweep result, and the partial similarity between the rest of the simulated frequency sweep result and the rest of the actual frequency sweep result, and continues to obtain the first weight corresponding to the preset peak similarity, the second weight corresponding to the preset trough similarity, and the third weight corresponding to the preset partial similarity, and finally weights the peak similarity, the trough similarity and the partial similarity according to the first weight, the second weight and the third weight to obtain the similarity. By weighted calculation of the peak similarity, the trough similarity and the partial similarity, a more comprehensive similarity can be obtained, which can better reflect the similarity between the simulated frequency sweep result and the actual frequency sweep result, and such calculation can save the resource cost of inspection and improve the inspection accuracy of hidden faults.

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

[0090] Optionally, when the similarity is not greater than the maximum similarity recorded in advance, the similarity recorded as the new maximum similarity is cancelled, and when the traversal of each transformer winding deformation situation is not completed, any transformer winding deformation situation that has not been traversed is used as the new current transformer winding deformation situation, and the step of setting the current transformer winding deformation situation in the finite element model of the pre-built target transformer 102 is returned to execute until the traversal of each transformer winding deformation situation is completed. When the traversal of each transformer winding deformation situation is completed, the transformer winding deformation situation corresponding to the maximum similarity is used as the transformer winding deformation situation of the target transformer. Effectively traversing each transformer winding deformation situation to avoid omission, and using the transformer winding deformation situation corresponding to the maximum similarity as the transformer winding deformation situation of the target transformer 102, improves the output credibility of the transformer winding deformation situation of the target transformer.

[0091] In one embodiment, before the transformer winding deformation occurs in the target transformer, the method includes: obtaining 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; obtaining the degree of similarity between the first simulation frequency sweep result and the actual frequency sweep result, and determining that the target transformer passes the search condition test for searching for the transformer winding deformation condition when the degree of similarity is greater than a preset similarity threshold.

[0092] For example, before the server 104 obtains the current transformer winding deformation, the server 104 first obtains the circuit model parameters of the target transformer, and constructs the circuit model of the target transformer according to the circuit model parameters, performs frequency sweep simulation on the circuit model, obtains the first simulation frequency sweep result of the circuit model, and finally obtains the similarity between the first simulation frequency sweep result and the actual frequency sweep result, and 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 a state where no winding change occurs, thereafter, when the target transformer 102 is deformed, the transformer winding deformation condition can be set in the finite element model of the target transformer 102 to determine the transformer winding deformation condition of the target transformer 102. When the target transformer is normal, modeling and frequency sweeping are performed to test the performance, avoiding the disadvantage that the performance test cannot be performed when the transformer winding is deformed in the target transformer, saving the cost of subsequent modeling and searching.

[0093] In an exemplary embodiment, as shown in FIG4 , a flowchart of a specific implementation of searching for transformer winding deformation conditions is provided, wherein:

[0094] Step 1-Step 3 Calculate the capacitance parameters after winding deformation:

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

[0096] Step 4-Step 5 Calculate the inductance parameters after winding deformation and establish the circuit model:

[0097] Similarly, based on the finite element model, after setting the deformation on the geometric structure, the magnetic field module is used to calculate the inductance parameters of each sub-winding of the transformer. After obtaining the model parameters, based on the actual electromagnetic connection relationship of the winding, each sub-winding is connected end to end, and input voltage, input resistance and output resistance are connected to form a complete winding circuit model. The winding circuit model is shown in Figure 5, where: k represents the number of each sub-winding (k=1, 2, 3,..., n), K i is the equivalent longitudinal capacitance of the ith sub-winding, C i is the capacitance of the ith sub-winding to ground, L i is the inductance of the ith sub-winding, V in Indicates input voltage, V out Represents the output voltage, R i Represents the input resistance, R o Represents the output resistance.

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

[0099] Based on the circuit model constructed in steps 1 to 5, a frequency sweep is performed to obtain the frequency sweep result after the winding deformation. The frequency sweep result of the circuit model is compared with the frequency sweep result of the actual winding, especially the peaks and troughs, and the similarity of the two waveforms is calculated. If the similarity is higher than the deformation condition that was previously determined as the search result, the search result is updated; otherwise, it is directly determined whether all deformation conditions have been traversed. If all deformation conditions have been traversed, the search result is output; otherwise, return to step 1 to calculate the model parameters of the next winding deformation condition, construct a circuit model to perform a frequency sweep, and calculate the similarity of the frequency sweep result until all deformation conditions have been traversed.

[0100] The complete workflow is as follows: calculate the model parameters after winding deformation based on the finite element model, build a winding circuit model to perform frequency sweep, calculate its similarity with the actual winding frequency sweep result, and finally take the one with the highest similarity among all deformation conditions as the search result.

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

[0102] (1) A finite element model is established based on the physical structure of the transformer. The deformation calculation circuit model parameters are set in the finite element model. The search results are locked by traversing the simulation. There is no need to disassemble the equipment, which saves manpower and material resources and avoids the possibility of secondary damage.

[0103] (2) Frequency sweep simulation based on the circuit model improves simulation efficiency while ensuring accuracy compared to the finite element model.

[0104] (3) The circuit modeling method is simple and is constructed through basic components within the software. Different transformer winding deformation conditions only require changing the model parameters, and it has high versatility.

[0105] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

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

[0107] In an exemplary embodiment, as shown in FIG6 , a transformer winding deformation condition searching device is provided, comprising: a first acquisition module 601, a frequency scanning module 602, a second acquisition module 603, a traversal module 604 and an output module 605, wherein:

[0108] The first acquisition module 601 is used to acquire the current transformer winding deformation and set the current transformer winding deformation in the pre-built finite element model of the target transformer to obtain circuit model parameters matching the current transformer winding deformation;

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

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

[0111] A traversal module 604 is used for, when the traversal of the deformation conditions of each transformer winding 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 pre-constructed finite element model of the target transformer until the traversal of the deformation conditions of each transformer winding is completed;

[0112] The output module 605 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 transformer winding deformation conditions is completed.

[0113] In one embodiment, the circuit model parameters include equivalent longitudinal capacitance, capacitance to ground and inductance, and the frequency scanning module 602 is also used to construct multiple sub-windings based on the equivalent longitudinal capacitance, capacitance to ground and inductance; obtain the electromagnetic connection relationship between the sub-windings, as well as the input voltage, input resistance and output resistance; use the electromagnetic connection relationship to connect the sub-windings, and combine the input voltage, input resistance and output resistance to construct a current winding circuit model corresponding to the current transformer winding deformation condition.

[0114] In one embodiment, the finite element model includes an electric field module and a magnetic field module, and the first acquisition module 601 is also used to obtain the inter-turn capacitance, inter-pancake capacitance and geometric capacitance of each sub-winding that matches the current transformer winding deformation through the electric field module of the finite element model, obtain the equivalent longitudinal capacitance of each sub-winding based on the inter-turn capacitance and the inter-pancake capacitance, and obtain the capacitance to ground of each sub-winding based on the geometric capacitance; and obtain the inductance of each sub-winding through the magnetic field module of the finite element model.

[0115] In an exemplary embodiment, the second acquisition module 603 is also used to obtain the peak similarity between the peak of the simulated frequency sweep result and the peak of the actual frequency sweep result, the trough similarity between the simulated frequency sweep result and the trough of the actual frequency sweep result, and the partial similarity between the rest of the simulated frequency sweep result and the rest of the actual frequency sweep result; obtain a first weight corresponding to a preset peak similarity, a second weight corresponding to a preset trough similarity, and a third weight corresponding to a preset partial similarity; weight the peak similarity, trough similarity and partial similarity according to the first weight, the second weight and the third weight to obtain the similarity.

[0116] In one embodiment, the second acquisition module 603 is further configured to cancel recording the similarity degree as a new maximum similarity degree when the similarity degree is not greater than the pre-recorded maximum similarity degree.

[0117] In one of the embodiments, before the transformer winding deformation occurs in the target transformer, the transformer winding deformation condition search device also includes: a pre-test module, used to obtain circuit model parameters of the target transformer, and construct a circuit model of the target transformer based on the circuit model parameters; perform a frequency sweep simulation on the circuit model to obtain a first simulation frequency sweep result of the circuit model; obtain the similarity between the first simulation frequency sweep result and the actual frequency sweep result, and when the similarity is greater than a preset similarity threshold, determine that the target transformer passes the search condition test for searching the transformer winding deformation condition.

[0118] Each module in the above transformer winding deformation condition search device can be implemented in whole or in part by software, hardware and a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the operations corresponding to each module.

[0119] In an exemplary embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be shown in FIG7. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as 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 used 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 operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store the current transformer winding deformation, the finite element model of the target transformer, the circuit model parameters, the simulation sweep frequency results and the actual sweep frequency results and similarity data. The input / output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a transformer winding deformation search method is implemented.

[0120] Those skilled in the art will understand that the structure shown in FIG. 7 is merely a block diagram of a partial structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0121] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the transformer winding deformation condition searching method of the above embodiment is implemented.

[0122] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the transformer winding deformation condition searching method of the above embodiment is implemented.

[0123] In one embodiment, a computer program product is provided, including a computer program, which, when executed by a processor, implements the transformer winding deformation condition searching method of the above embodiment.

[0124] 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, stored data, displayed data, 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 relevant data must comply with relevant regulations.

[0125] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the 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. 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. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0126] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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.

[0127] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for searching transformer winding deformation, characterized in that: The method comprises: Acquire 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 matching the current transformer winding deformation condition; According to the circuit model parameters, a current winding circuit model corresponding to the current transformer winding deformation is constructed, and a frequency sweep simulation is performed on the current winding circuit model to obtain a simulation frequency sweep result of the current winding circuit model; Obtaining a similarity between the simulated frequency sweep result and an actual frequency sweep result of the target transformer, 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 each transformer winding is not completed, any transformer winding deformation condition that has not been traversed is used as a new current transformer winding deformation condition, and the step of setting the current transformer winding deformation condition in the finite element model of the pre-constructed target transformer is returned to execute until the traversal of the deformation conditions of each transformer winding 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 recorded is used 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 equal value 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 by utilizing 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 the pre-built finite element model of the target transformer to obtain circuit model parameters matching the current transformer winding deformation condition includes: The inter-turn capacitance, inter-pancake capacitance and geometric capacitance of each of the sub-windings matching the current transformer winding deformation are obtained through the electric field module of the finite element model, the equivalent longitudinal capacitance of each of the sub-windings is obtained according to the inter-turn capacitance and inter-pancake capacitance, and the capacitance to ground of each of the sub-windings is obtained 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, characterized in that: The obtaining of the similarity between the simulation frequency sweep result and the actual frequency sweep result of the target transformer includes: Acquire the similarity between the peaks of the simulated frequency sweep result and the peaks of the actual frequency sweep result, the similarity between the troughs of the simulated frequency sweep result and the troughs of the actual frequency sweep result, and the similarity between the rest of the simulated frequency sweep result and the rest 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; The peak similarity, the trough similarity and the partial similarity are weighted according to the first weight, the second weight and the third weight to obtain the similarity.

5. The method according to claim 1, characterized in that: 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 the 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.

6. The method according to claim 1, characterized in that Before the transformer winding deformation occurs in the target transformer, the method comprises: 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.

7. A transformer winding deformation search device, characterized in that: The device comprises: A first acquisition module is used to acquire the 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 a circuit model parameter matching the current transformer winding deformation condition; A frequency sweeping module, used to construct a current winding circuit model corresponding to the current transformer winding deformation according to the circuit model parameters, and perform a frequency sweeping simulation on the current winding circuit model to obtain a simulation frequency sweeping result of the current winding circuit model; A second acquisition module is used to obtain the similarity between the simulated frequency sweep result and the actual frequency sweep result of the target transformer, and when the similarity is greater than the pre-recorded maximum similarity, record the similarity as a new maximum similarity; A traversal module, used for, when the traversal of the deformation conditions of each transformer winding 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 pre-constructed target transformer until the traversal of the deformation conditions of each transformer winding is completed; The output module is used to, when the traversal of the deformation conditions of each transformer winding is completed, use the transformer winding deformation condition corresponding to the maximum similarity recorded as the transformer winding deformation condition of the target transformer.

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 6 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 6 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 6 are implemented.

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