Transformer anti-short-circuit force evaluation report generation method and device

Abstract

The invention discloses a transformer anti-short-circuit force evaluation report generation method and device, and relates to the technical field of transformers. The method comprises the following steps: acquiring a calculated value of an anti-short-circuit force index of a target transformer; the calculated value of the anti-short-circuit force index is evaluated according to the anti-short-circuit force index threshold value, and an evaluation result is obtained and used for representing whether the anti-short-circuit force index is normal or not; and generating an anti-short-circuit force evaluation report of the target transformer according to the calculated value and the evaluation result of the anti-short-circuit force index. According to the embodiment of the invention, the method can automatically generate the anti-short-circuit force evaluation report of the target transformer, simplifies the generation process of the anti-short-circuit force evaluation report of the transformer, and improves the timeliness of the anti-short-circuit force evaluation report.

Description

Technical Field

[0001] The present application belongs to the technical field of transformers, and specifically relates to a method and device for generating a transformer short-circuit resistance assessment report. Background Art

[0002] Calculating the short-circuit resistance of a transformer is crucial for the transformer. From a design perspective, it can guide the optimization of the transformer structure, making the winding support more reasonable, the core clamping more firmly, the mechanical stability stronger, and reducing the risk of deformation and damage during short circuit. From the perspective of material selection, the short-circuit resistance calculation can provide a basis for selecting materials with high mechanical strength, good insulation and heat resistance, ensuring that the transformer material is reliable under short-circuit impact. At the same time, as an important means of performance evaluation, it can accurately determine the transformer's short-circuit resistance, control product quality, and improve performance.

[0003] At present, transformer short-circuit capacity assessment reports are often prepared by professional verification personnel through various calculations to obtain the transformer short-circuit capacity assessment data, and manually input the short-circuit capacity assessment report according to different user requirements. The generation process is complicated and tedious, and the output report cycle is long. Summary of the invention

[0004] The technical problem to be solved by the present application is to provide a method and device for generating a transformer short-circuit resistance evaluation report in view of the above-mentioned deficiencies in the prior art. By using this method, a short-circuit resistance evaluation report of a target transformer can be automatically generated, thereby simplifying the generation process of the transformer short-circuit resistance evaluation report and improving the timeliness of the short-circuit resistance evaluation report.

[0005] In a first aspect, an embodiment of the present application provides a method for generating a transformer short-circuit resistance evaluation report, comprising: obtaining a calculated value of a short-circuit resistance index of a target transformer; evaluating the calculated value of the short-circuit resistance index according to a short-circuit resistance index threshold to obtain an evaluation result, and the evaluation result is used to characterize whether the short-circuit resistance index is normal; generating a short-circuit resistance evaluation report of the target transformer according to the calculated value of the short-circuit resistance index and the evaluation result.

[0006] In some embodiments of the first aspect, the evaluation results include normal indicators, over-standard indicators and seriously over-standard indicators; the calculated value of the anti-short-circuit force index is evaluated according to the anti-short-circuit force index threshold to obtain the evaluation results, including: when the calculated value of the anti-short-circuit force index is less than or equal to the anti-short-circuit force index threshold, the evaluation result is determined to be a normal indicator; or, when the calculated value of the anti-short-circuit force index is greater than the anti-short-circuit force index threshold and less than or equal to the product of a preset coefficient and the anti-short-circuit force index threshold, the evaluation result is determined to be an over-standard indicator; or, when the calculated value of the anti-short-circuit force index is greater than the product of the preset coefficient and the anti-short-circuit force index threshold, the evaluation result is determined to be a seriously over-standard indicator.

[0007] In some embodiments of the first aspect, when the evaluation result is an over-standard indicator, the method also includes: putting the calculated value of the short-circuit resistance indicator into an over-standard list; or, when the evaluation result is a seriously over-standard indicator, the method also includes: putting the calculated value of the short-circuit resistance indicator into an over-standard list, and setting a seriously over-standard mark at the position where the calculated value of the short-circuit resistance indicator is located.

[0008] In some embodiments of the first aspect, a short-circuit resistance evaluation report of a target transformer is generated according to the calculated value and evaluation result of the short-circuit resistance index, including: obtaining a target output template; filling the calculated value and evaluation result of the short-circuit resistance index into corresponding positions in the target output template to generate the short-circuit resistance evaluation report of the target transformer; or, obtaining the target output template and a first type of data, the first type of data being used to characterize the design parameters of the target transformer; filling the calculated value, evaluation result and first type of data of the short-circuit resistance index into corresponding positions in the target output template to generate the short-circuit resistance evaluation report of the target transformer.

[0009] In some embodiments of the first aspect, obtaining a calculated value of a short-circuit resistance index of a target transformer includes: obtaining first data and a coil type of the target transformer, the first data including first-category data and second-category data, the first-category data being used to characterize design parameters of the target transformer, and the second-category data being used to characterize calculation data of an electromagnetic calculation sheet of the target transformer; constructing a target short-circuit model according to the first data and the coil type, the target short-circuit model including a three-phase symmetrical short-circuit model and a single-phase short-circuit model, or including a three-phase symmetrical short-circuit model; the short-circuit resistance index output by the three-phase symmetrical short-circuit model and the single-phase short-circuit model is the same; and using the target short-circuit model to determine the calculated value of the short-circuit resistance index of the target transformer.

[0010] In some embodiments of the first aspect, a target short-circuit model is constructed according to the first data and the coil type, including: obtaining a target type of a target transformer; standardizing the second type of data according to the target type to obtain second data; and constructing a target short-circuit model according to the second data, the first type of data and the coil type.

[0011] In some embodiments of the first aspect, the second type of data is standardized according to the target type to obtain the second data, including: determining the target transformer general model from multiple transformer general models according to the target type and the first mapping relationship, the transformer general model includes the transformer type, whether axial splitting, whether medium voltage regulation, basic data module, core module and coil module; different transformer types correspond to different type marks; the first mapping relationship is the correspondence between multiple transformer types and multiple transformer general models; the second type of data is filled into the corresponding position of the target transformer general model to complete the standardization of the second type of data to obtain the second data.

[0012] In some embodiments of the first aspect, a target short-circuit model is constructed according to the second data, the first category of data and the coil type, including: when the coil type includes a voltage stabilizing coil, a three-phase symmetrical short-circuit model and a single-phase short-circuit model are constructed according to the second data and the first category of data; when the coil type does not include a voltage stabilizing coil, a three-phase symmetrical short-circuit model is constructed according to the second data and the first category of data.

[0013] In some embodiments of the first aspect, the three-phase symmetrical short-circuit model includes a first sub-model and a second sub-model; when the target short-circuit model includes a three-phase symmetrical short-circuit model, the target short-circuit model is used to determine the calculated value of the short-circuit resistance index of the target transformer, including: obtaining the short-circuit impedance and the current operating current of the target coil in the target transformer; using the first sub-model to process the short-circuit impedance and the current operating current to obtain the target short-circuit current of the target coil; using the second sub-model to process the target short-circuit current to obtain the calculated value of the short-circuit resistance index of the target transformer.

[0014] In some embodiments of the first aspect, the single-phase short-circuit model includes a second sub-model and a third sub-model; when the target short-circuit model includes a single-phase short-circuit model, the target short-circuit model is used to determine the calculated value of the short-circuit resistance index of the target transformer, including: obtaining the coil system impedance and coil impedance of the target coil in the target transformer; using the third sub-model to process the coil system impedance and the coil impedance to obtain the target short-circuit current of the target coil; using the second sub-model to process the target short-circuit current to obtain the calculated value of the short-circuit resistance index of the target transformer.

[0015] In some implementations of the first aspect, the target short-circuit current is processed using the second sub-model to obtain a calculated value of the short-circuit resistance index of the target transformer, including:

[0016] The target coil information of the target coil is obtained, and the target coil information includes at least one of the coil name, coil position, system impedance, system zero-sequence impedance, neutral point grounding resistance, rated phase voltage, rated phase current, rated grounding impedance, number of turns, number of pads, pad width, number of stays, stay width, conductor elastic modulus, coil form, conductor shape, conductor form and conductor yield strength; the target short-circuit current and the target coil information are processed by the second sub-model to obtain the calculated value of the short-circuit resistance index of the target transformer, and the calculated value of the short-circuit resistance index includes at least one of the calculated value of the radial bending safety factor, radial circumferential compression safety factor, axial bending safety factor, axial circumferential tensile safety factor, end insulation compression safety factor and winding temperature after short circuit of the target coil.

[0017] In a second aspect, an embodiment of the present application provides a transformer short-circuit resistance evaluation report generation device, comprising: a first acquisition module, used to obtain the calculated value of the short-circuit resistance index of the target transformer; an evaluation module, connected to the first acquisition module, used to evaluate the calculated value of the short-circuit resistance index according to a short-circuit resistance index threshold to obtain an evaluation result, and the evaluation result is used to characterize whether the short-circuit resistance index is normal; a generation module, connected to the evaluation module, generates a short-circuit resistance evaluation report of the target transformer according to the calculated value of the short-circuit resistance index and the evaluation result.

[0018] In some embodiments of the second aspect, the evaluation results include normal indicators, over-standard indicators and seriously over-standard indicators; the evaluation module is specifically used to: when the calculated value of the short-circuit resistance index is less than or equal to the short-circuit resistance index threshold, determine that the evaluation result is a normal indicator; or, when the calculated value of the short-circuit resistance index is greater than the short-circuit resistance index threshold and less than or equal to the product of a preset coefficient and the short-circuit resistance index threshold, determine that the evaluation result is an over-standard indicator; or, when the calculated value of the short-circuit resistance index is greater than the product of the preset coefficient and the short-circuit resistance index threshold, determine that the evaluation result is a seriously over-standard indicator.

[0019] In some embodiments of the second aspect, the generation module is specifically used to: obtain a target output template; fill the calculated value and evaluation result of the short-circuit resistance index into the corresponding positions in the target output template to generate a short-circuit resistance evaluation report for the target transformer; or, obtain the target output template and a first type of data, the first type of data being used to characterize the design parameters of the target transformer; fill the calculated value, evaluation result and first type of data of the short-circuit resistance index into the corresponding positions in the target output template to generate a short-circuit resistance evaluation report for the target transformer.

[0020] In some embodiments of the second aspect, the first acquisition module is specifically used to: acquire first data and a coil type of a target transformer, the first data including first-category data and second-category data, the first-category data being used to characterize design parameters of the target transformer, and the second-category data being used to characterize calculation data of an electromagnetic calculation unit of the target transformer; construct a target short-circuit model based on the first data and the coil type, the target short-circuit model including a three-phase symmetrical short-circuit model and a single-phase short-circuit model, or including a three-phase symmetrical short-circuit model; the short-circuit resistance index output by the three-phase symmetrical short-circuit model and the single-phase short-circuit model is the same; and use the target short-circuit model to determine the calculated value of the short-circuit resistance index of the target transformer.

[0021] According to the transformer short-circuit resistance evaluation report generation method and device provided in the embodiment of the present application, the calculated value of the short-circuit resistance index of the target transformer is first obtained, and then the calculated value of the short-circuit resistance index is evaluated according to the short-circuit resistance index threshold to obtain the evaluation result, and then according to the calculated value of the short-circuit resistance index and the evaluation result, the short-circuit resistance evaluation report of the target transformer can be automatically generated, simplifying the generation process of the transformer short-circuit resistance evaluation report, improving the timeliness of the short-circuit resistance evaluation report, and in the design process of the transformer, using the transformer short-circuit resistance evaluation report generation method to calculate and evaluate the short-circuit resistance can provide a reference for the design to improve the direction. In addition, the transformer short-circuit resistance evaluation report generation method standardizes the calculation process of the evaluation report, improves or solves the problem of inconsistent report data caused by human factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram showing a flow chart of a method for generating a transformer short-circuit resistance assessment report provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram showing a three-phase symmetrical short-circuit condition of a coil provided in an embodiment of the present application;

[0024] Figure 3-1 A partial schematic diagram showing a single-phase short-circuit to ground operating condition provided by an embodiment of the present application;

[0025] Figure 3-2 Another partial schematic diagram showing a single-phase short-circuit to ground operating condition provided by an embodiment of the present application;

[0026] Figure 4 Another flowchart of the method for generating a transformer short-circuit resistance assessment report provided in an embodiment of the present application is shown;

[0027] Figure 5 A structural schematic diagram of a transformer short-circuit resistance assessment report generation device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below with reference to the accompanying drawings and embodiments.

[0029] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present application and are not configured to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0030] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0031] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0032] Example 1

[0033] The transformer short-circuit resistance evaluation report generation method provided in the embodiment of the present application can be applied to the transformer design stage, transformer selection stage, transformer manufacturing and testing, power system analysis and other processes. The transformer short-circuit resistance evaluation report generation method can be executed by a transformer short-circuit resistance evaluation report generation device and an electronic device. The following is an example of the transformer short-circuit resistance evaluation report generation method being executed by an electronic device.

[0034] like Figure 1 As shown, the method for generating a transformer short-circuit resistance assessment report provided in an embodiment of the present application may include steps S110 to S130.

[0035] S110. Obtain a calculated value of a short-circuit resistance index of a target transformer.

[0036] S120, evaluating the calculated value of the short-circuit resistance index according to the short-circuit resistance index threshold value to obtain an evaluation result, where the evaluation result is used to indicate whether the short-circuit resistance index is normal.

[0037] S130: Generate a short-circuit resistance evaluation report of the target transformer according to the calculated value and evaluation result of the short-circuit resistance index.

[0038] According to the transformer short-circuit resistance evaluation report generation method provided by the embodiment of the present application, the calculated value of the short-circuit resistance index of the target transformer is first obtained, and then the calculated value of the short-circuit resistance index is evaluated according to the short-circuit resistance index threshold to obtain the evaluation result, and then according to the calculated value of the short-circuit resistance index and the evaluation result, the short-circuit resistance evaluation report of the target transformer can be automatically generated, simplifying the generation process of the transformer short-circuit resistance evaluation report, improving the timeliness of the short-circuit resistance evaluation report, and in the design process of the transformer, using the transformer short-circuit resistance evaluation report generation method to calculate and evaluate the short-circuit resistance, can provide a reference for the improvement direction of the design. In addition, the transformer short-circuit resistance evaluation report generation method standardizes the calculation process of the evaluation report, improves or solves the problem of inconsistent report data caused by human factors.

[0039] The specific implementation methods of the above steps are introduced below.

[0040] In step S110, in some implementations, obtaining a calculated value of a short-circuit resistance index of a target transformer includes:

[0041] Acquire first data and a coil type of a target transformer, wherein the first data includes first-category data and second-category data, wherein the first-category data is used to characterize design parameters of the target transformer, and the second-category data is used to characterize calculation data of an electromagnetic calculation sheet of the target transformer;

[0042] According to the first data and the coil type, a target short-circuit model is constructed, wherein the target short-circuit model includes a three-phase symmetrical short-circuit model and a single-phase short-circuit model, or includes a three-phase symmetrical short-circuit model; the three-phase symmetrical short-circuit model and the single-phase short-circuit model have the same short-circuit resistance index output;

[0043] The target short-circuit model is used to determine the calculated value of the short-circuit resistance index of the target transformer.

[0044] The target transformer may be any transformer for which a calculated value of a short-circuit resistance index needs to be determined.

[0045] Exemplarily, the first type of data is used to characterize the design parameters of the target transformer. The first type of data may include at least one of the following: transformer manufacturer, short circuit duration, wire axial self-bonding coefficient, plate material, plate area, wire material of each coil, neutral point grounding method, grounding resistance, maximum short circuit current, etc. For example, the first type of data may include transformer manufacturer; for another example, the first type of data may include transformer manufacturer and short circuit duration; for another example, the first type of data may include transformer manufacturer, short circuit duration, wire axial self-bonding coefficient, plate material, plate area, wire material of each coil, neutral point grounding method, grounding resistance, and maximum short circuit current. Exemplarily, coil types may include voltage-stabilizing coils and non-voltage-stabilizing coils.

[0046] Exemplarily, the second type of data is used to characterize the calculation data of the target transformer electromagnetic calculation sheet. The second type of data may include at least one of the following: drawing number, product model, rated capacity, connection group, frequency, altitude, voltage regulation mode of the transformer, inner diameter, outer diameter, radial direction, coil form, rated voltage, rated capacity, rated current, most positive tap, most negative tap, tap ratio, number of gears, pad width, reactance height, specific data of the wire gauge used (wire width, thickness, turn insulation, number of parallel windings), etc. For example, the second type of data may include the rated capacity; for another example, the second type of data may include the drawing number, product model, rated capacity, connection group, frequency, altitude, voltage regulation mode of the transformer; for another example, the second type of data may include the inner diameter, outer diameter, radial direction, coil form, rated voltage, rated capacity, rated current, most positive tap, most negative tap, tap ratio, number of gears, pad width, reactance height, specific data of the wire gauge used (wire width, thickness, turn insulation, number of parallel windings), etc. Among them, the voltage regulation method can be a method of adjusting the output voltage through the design and operation of the transformer. The voltage regulation method may include on-load voltage regulation, no-load voltage regulation, automatic voltage regulation, ratio adjustment and other voltage regulation methods; the connection group refers to the connection method of the transformer winding, including star connection, triangle connection, zero-sequence connection, etc.

[0047] For example, the electronic device may pre-store a transformer electromagnetic calculation sheet of the target transformer, and the transformer electromagnetic calculation sheet includes the second type of data, so that the second type of data can be directly obtained from the transformer electromagnetic calculation sheet later. In addition, the electronic device may also pre-store coil types for subsequent direct call. The first type of data can be obtained by interface input.

[0048] Exemplarily, the target short-circuit model may be a model capable of determining a calculated value of a short-circuit resistance index of a target transformer.

[0049] In some implementations, constructing a target short-circuit model according to the first data and the coil type includes:

[0050] Get the target type of the target transformer;

[0051] According to the target type, the second type of data is standardized to obtain second data;

[0052] A target short-circuit model is constructed according to the second data, the first type of data and the coil type.

[0053] In this embodiment, the second data is obtained by performing standardization processing on the second type of data according to the target type, so that the second data can meet the needs of short-circuit resistance calculation.

[0054] Exemplarily, the second data may be the second type of data after standardization, and the second data may meet the need for short-circuit resistance calculation.

[0055] Exemplarily, the target type may be any one of a conventional power transformer, an autotransformer, a split transformer, etc. For example, the target type may be a conventional power transformer; for another example, the target type may be an autotransformer; for another example, the target type may be a split transformer.

[0056] Exemplarily, the target type of the target transformer may be pre-stored in the electronic device for subsequent direct call.

[0057] In some examples, the second type of data is standardized according to the target type to obtain the second data, including:

[0058] According to the target type and the first mapping relationship, a target transformer general model is determined from multiple transformer general models, the transformer general model includes transformer type, whether axial splitting, whether medium voltage regulation, basic data module, core module and coil module; different transformer types correspond to different type tags; the first mapping relationship is the correspondence between multiple transformer types and multiple transformer general models;

[0059] The second type of data is filled into the corresponding position of the target transformer general model to complete the standardization of the second type of data and obtain the second data.

[0060] In this implementation, the target transformer general model can be determined quickly and accurately from a plurality of transformer general models through the first mapping relationship.

[0061] That is to say, when reading the second type of data of different transformers, in order to solve the problem of the number of different types of transformer data and the inconsistency of variable names, different mapping relationships are established to correspond them with the transformer general model data, so as to facilitate the next step of data standardization. The parameters of different transformers will be different, which is inconsistent with the data variables in the transformer general model. The first mapping relationship matches these two types of data one by one.

[0062] Exemplarily, the first mapping relationship may be stored in the form of a mapping table.

[0063] Exemplarily, the target transformer general model may be a transformer general model corresponding to the target type, which may integrate the first type of data and the second type of data into one object data, which may be used for subsequent calculation of short-circuit resistance.

[0064] Exemplarily, the basic data module is a module that stores public, basic transformer overall data; the core module only contains relevant data such as the core type, core diameter, and core height of the core, and a transformer has only one core; the coil module includes multiple coil definitions in high-voltage coil, low-voltage coil, medium-voltage coil, high-adjustment coil, medium-adjustment coil, low-voltage 1 coil, low-voltage 2 coil, and excitation coil; the core can be the heart of the transformer, and the coil is the blood vessel and nerve of the transformer. The basic data module, core module, and coil module are in parallel.

[0065] Exemplarily, filling the second type of data into the corresponding position of the target transformer general model may include: writing the second type of data into the corresponding position of the basic data module; for the same type of transformer, the corresponding data of the coil is filled into the corresponding coil definition in the coil module; according to the relative relationship between the inner and outer diameters of the coil, the physical position of each coil is determined, and the position information of the coil is set according to the physical position of the coil, and the position information of the non-existent coil is set to 0; the data of the core type in the second type of data is filled into the core module, and different coefficients are set according to the different values ​​of the data of the core type in the second type of data. In this way, when calculating the short-circuit resistance later, relevant calculations can be performed based on the second data.

[0066] More specifically, the core module includes the core type, silicon steel sheet grade, diameter, and the number of columns, yokes, side columns, and side yokes; the values ​​of the first three variables can be determined according to the data of the electromagnetic calculation sheet (i.e., the second type of data); the specific value of the fourth parameter (i.e., the number of columns, the number of yokes, the number of side columns, and the number of side yokes) can be determined according to the core type; according to the number of coils in the calculation sheet (i.e., the second type of data), first determine which coils exist, and then put the data read in the electromagnetic calculation sheet (i.e., the second type of data) in the corresponding defined coil module, and the coil position determines the relative position relationship (0, 1, 2, 3, 4, 5, etc.) according to the size of the coil radius, and some values ​​that need to be calculated, such as the maximum outer limit thickness and width of the wire gauge, are relatively calculated according to the wire calculation standard. Among them, at least one of the number of columns, the number of yokes, the number of side columns, and the number of side yokes can be 0.

[0067] It should be noted that the different arrangements of the coils of the transformer have a great impact on the calculation of the short-circuit resistance. Therefore, when performing standardization, it is necessary to mark the position of each coil in the transformer arrangement, that is, different types of transformers correspond to different types of marks; in later calculations and evaluations, the insulation structure of the transformer can be determined according to the coil position, so as to calculate the short-circuit resistance.

[0068] That is to say, in an embodiment of the present application, the standardization processing of the second type of data of the target transformer includes the following steps: establishing a general model of the transformer, the general model of the transformer includes the type of transformer, whether it is axially split, whether it is medium voltage regulation, basic data module, core module and coil module; matching the electromagnetic calculation single data of transformers of different types and structures (i.e., the second type of data) with the data in the transformer model (i.e., the general model of the target transformer); standardizing the coil data related data (i.e., the second type of data) and converting it into the data and structure required for the short-circuit calculation coil.

[0069] Exemplarily, the coil data-related data is standardized and converted into the data and structure required for the short-circuit calculation coil, including: basic coil data->short-circuit coil basic data->short-circuit coil data under working conditions.

[0070] Among them, the basic data of the coil is obtained from the calculation sheet (i.e. the electromagnetic calculation sheet) or is relatively calculated based on the calculation relationship, and is the basic data in the electromagnetic calculation sheet. The definition of the short-circuit coil (i.e. the basic data of the short-circuit coil) is exactly the same as the short-circuit coil under working conditions (i.e. the short-circuit coil data under working conditions); the short-circuit coil is a coil under various calculations under short-circuit conditions, and compared with the basic data of the coil, it will have more forces and corresponding safety factors for the short-circuit resistance assessment; the relevant basic data obtained from the basic data of the coil is used as the basic data of the short-circuit coil for short-circuit force calculation; the calculation of various values ​​in the short-circuit coil is mainly related to the operating current and the maximum short-circuit current, and the data of other parameters from the basic data of the coil is basically unchanged.

[0071] The short-circuit coil data under working conditions is the short-circuit coil value calculated specifically under each working condition. The operating current and maximum short-circuit current of this part of data have specific values, and all the required parameters can be calculated. The operating current and maximum short-circuit current of the same coil under different working conditions are different, so the calculated value of the short-circuit coil under each working condition is different.

[0072] The basic data of the coil is assigned to the basic data of the short-circuit coil, and the basic data of the short-circuit coil is used for basic calculations (i.e., calculations of data that have nothing to do with the operating current and the maximum short-circuit current), and then used as public data; for each working condition, a copy of the basic data of the short-circuit coil becomes the short-circuit coil of the short-circuit coil data under the working condition, and then relevant calculations are performed based on the operating current and the maximum short-circuit current under the working condition.

[0073] In some examples, constructing a target short-circuit model according to the second data, the first type of data, and the coil type includes:

[0074] In the case where the coil type includes a voltage stabilizing coil, a three-phase symmetrical short-circuit model and a single-phase short-circuit model are constructed according to the second data and the first type of data;

[0075] When the coil type does not include a voltage stabilizing coil, a three-phase symmetrical short-circuit model is constructed according to the second data and the first type of data.

[0076] In this embodiment, different target short-circuit models are constructed according to different coil types, which provides a basis for subsequently determining the calculated value of the short-circuit resistance index of the target transformer according to different target short-circuit models, thereby improving the accuracy of the subsequent calculated value of the short-circuit resistance index of the target transformer.

[0077] The coil type does not include a voltage-stabilizing coil, that is, the coil type is a non-voltage-stabilizing coil.

[0078] Exemplarily, according to the coil type and the number of coils in the second data, a model is constructed for calculating the short-circuit resistance under all working conditions to obtain a three-phase symmetrical short-circuit model and a single-phase short-circuit model.

[0079] Specifically, according to the second data and the first type of data, a three-phase symmetrical short-circuit model is constructed, including: determining the three-phase symmetrical short-circuit working condition from the second data and the first type of data, and constructing a first sub-model and a second sub-model based on the three-phase symmetrical short-circuit working condition, the first sub-model includes short-circuit current = short-circuit impedance * current operating current; the second sub-model includes coil name, coil position, system impedance, system zero-sequence impedance, neutral point grounding resistance, rated phase voltage, rated phase current, rated grounding impedance, number of turns, number of pads, pad width, number of struts, strut width, conductor elastic modulus, coil form, conductor shape, conductor form, conductor yield strength, Parameters including axial bending stress, axial bending safety factor, protruding cross-sectional area, pad area, pad compression stress, pad compression safety factor, end insulation pad area, end insulation stress, end insulation compression safety factor, distortion coefficient, dynamic tilt coefficient, tilt force, allowable value of axial tilt force, end pressure, bottom pressure, annular tensile stress, annular compressive stress, maximum axial compression force, radial electromotive force, radial bending stress, radial bending safety factor, annular compression safety factor, protruding thrust, axial stability safety factor, thermally stable short-circuit current, winding temperature after short circuit, etc.; the first sub-model and the second sub-model are summarized into a three-phase symmetrical short-circuit model.

[0080] Exemplarily, the three-phase symmetrical short-circuit working condition requires calculation of various indices of the short-circuit resistance of the participating coils under each working condition (i.e., the short-circuit resistance index); the three-phase symmetrical short-circuit model is used to calculate the calculated value of the short-circuit resistance index of each coil under the three-phase symmetrical short-circuit condition under various working conditions. The parameters of the three-phase symmetrical short-circuit model may include at least one of the working condition name, calculated impedance, coil impedance, main coil short-circuit coil group, and auxiliary coil short-circuit coil group. The list of three-phase symmetrical short-circuit working conditions is as follows: Figure 2 As shown, the three-phase symmetrical short-circuit working conditions include HR-MR, HX-MR, HN-MR, HR-MX, HX-MX, HN-MX, HR-MN, HX-MN, HN-MN, HR-LR, HX-LR, HN-LR, MR-LR, MX-LR, MN-LR, HR-L1R, HX-L1R, HN-L1R, HR-L2R, HX-L2R and HN-L2R; among which H represents high-voltage coil; M represents medium-voltage coil; L represents Low-voltage coil; W represents voltage-stabilizing coil; L1 represents low-voltage coil 1 (dedicated to split transformer); L2 represents low-voltage coil 2 (dedicated to split transformer); R represents rated tap; X represents the most positive tap; N represents the most negative tap; for example, HR-MR refers to the operating condition high-voltage rated and medium-voltage rated operation, and the coils involved are high-voltage coil and medium-voltage coil; for another example, HX-MR: the operating condition high-voltage most positive and medium-voltage rated operation, and the coils involved in the operation are high-voltage coil, medium-voltage coil, and high-profile coil, and others are similar.

[0081] It should be noted that due to the different transformer types and the number of coils, the actual calculation Figure 2 One or more of these may occur in all operating conditions.

[0082] It can be understood that the calculation methods of the three-phase symmetrical short-circuit model and the single-phase short-circuit model for calculating the short-circuit resistance index are different, that is, the three-phase symmetrical short-circuit model and the single-phase short-circuit model are obtained according to the calculation form of the short-circuit resistance value.

[0083] Specifically, according to the second data and the first type of data, a single-phase short-circuit model is constructed, including: determining the single-phase short-circuit condition from the second data and the first type of data, and constructing the second sub-model and the third sub-model based on the single-phase short-circuit condition, the second sub-model includes the coil name, coil position, system impedance, system zero-sequence impedance, neutral point grounding resistance, rated phase voltage, rated phase current, rated grounding impedance, number of turns, number of pads, pad width, number of stays, stay width, conductor elastic modulus, coil form, conductor shape, conductor form, conductor yield strength, axial bending stress, axial bending safety factor, protruding cross-sectional area, pad area, pad compression stress force, block compression safety factor, end insulation block area, end insulation stress, end insulation compression safety factor, torsion coefficient, dynamic tilt coefficient, tilt force, allowable value of axial tilt force, end pressure, bottom pressure, annular tensile stress, annular compressive stress, maximum axial compression force, radial electromotive force, radial bending stress, radial bending safety factor, annular compression safety factor, protruding thrust, axial stability safety factor, thermally stable short-circuit current, winding temperature after short circuit and other parameters; the third sub-model can process the coil system impedance and coil impedance to obtain the target short-circuit current; the second sub-model and the third sub-model are summarized into a three-phase symmetrical short-circuit model.

[0084] Exemplarily, the single-phase to ground short-circuit condition (i.e., single-phase short-circuit condition) requires calculation of various indicators of short-circuit resistance (i.e., short-circuit resistance indicators) when two coils are short-circuited under the same condition. The parameters of the single-phase short-circuit model include at least one of the coil name, calculation phase current, system impedance, zero-sequence system impedance, short-circuit impedance under condition, zero-sequence impedance under condition, positive-sequence calculation data group, zero-sequence calculation data group, short-circuit current group, system-side calculation data group, transformer-side calculation data group, short-circuit coil group, and sequence mark of short-circuit coil.

[0085] For example, the short-circuit resistance index can be used to characterize the ability of the transformer to withstand mechanical forces under a short-circuit fault. Figure 3-1 and Figure 3-2As shown. Single-phase short-circuit conditions include HV single-phase to ground rating, HV single-phase to ground most positive, HV single-phase to ground most negative, MV single-phase to ground rating, MV single-phase to ground most positive, MV single-phase to ground most negative, LV single-phase to ground rating, LV1 single-phase to ground rating and LV2 single-phase to ground rating. HV single-phase to ground rating includes HRLRWR, HRMRWR, HRMXWR, HRMNWR, HRL1RWR, HRL2RWR; HV single-phase to ground most positive includes HXLRWR, HXL1RWR, HXL2RWR, HXMRWR, HXMXWR and HXMNWR; HV single-phase to ground most negative includes HNLRWR, HNL1RWR, HNL2RWR, HNMRWR, HNMXWR and HNMNWR; MV single-phase to ground rating includes MRLRWR, HRMRWR, HXMRWR and HNMRWR MV single-phase most positive to ground includes MXLRWR, HRMXWR, HXMXWR and HNMXWR; MV single-phase most negative to ground includes MNLRWR, HRMNLR, HXMNWR and HNMNWR; LV single-phase to ground rating includes HRLRWR, HXLRWR, HNLRWR, MRLRWR, MXLRWR and MNLRWR; LV1 single-phase to ground rating includes HRL1RWR, HXL1RWR and HNL1RWR; LV2 single-phase to ground rating includes HRL2RWR, HXL2RWR and HNL2RWR. Among them, H represents high-voltage coil; M represents medium-voltage coil; L represents low-voltage coil; W represents voltage-stabilizing coil; L1 represents low-voltage coil 1 (dedicated to split transformer); L2 represents low-voltage coil 2 (dedicated to split transformer); R represents rated tap; X represents the most positive tap; N represents the most negative tap; single-phase short-circuit condition is only calculated when there is a voltage-stabilizing coil. It is the operation with the voltage-stabilizing coil added under three-phase symmetrical conditions. For example, HRLRWR refers to the operation of high-voltage rated and low-voltage rated with voltage stabilization (there is no voltage regulating coil for voltage stabilization, so all voltage stabilization is WR). At this time, the coils involved are high-voltage coils, low-voltage coils, and voltage stabilization coils; when one of the coils is short-circuited, such as when the high voltage is short-circuited to the ground, it is the case that the high-voltage coil is short-circuited, and the operating current and short-circuit current of the coils involved in the operation. The single-phase working condition is to calculate the maximum value of the respective short-circuit force data when the coil is short-circuited under various working conditions. Therefore, all possible situations need to be calculated, and then the maximum value is selected in the calculation result. HRMRWR refers to the operation of high-voltage rated and medium-voltage rated with voltage stabilization. At this time, the coils involved are high-voltage coils, medium-voltage coils, and voltage stabilization coils.

[0086] It should be noted that Figure 3-1 and Figure 3-2 A complete list of single-phase short-circuit conditions is formed. The three-phase symmetrical short-circuit model and the single-phase short-circuit model can exist in the form of a list.

[0087] In some embodiments, the three-phase symmetrical short-circuit model includes a first sub-model and a second sub-model;

[0088] When the target short-circuit model includes a three-phase symmetrical short-circuit model, the target short-circuit model is used to determine the calculated value of the short-circuit resistance index of the target transformer, including:

[0089] Obtaining the short-circuit impedance and current operating current of the target coil in the target transformer;

[0090] The first sub-model is used to process the short-circuit impedance and the current operating current to obtain the target short-circuit current of the target coil;

[0091] The second sub-model is used to process the target short-circuit current to obtain a calculated value of the short-circuit resistance index of the target transformer.

[0092] Exemplarily, the first sub-model may be a model that can process the short-circuit impedance and the current operating current to obtain the target short-circuit current of the target coil; the second sub-model may be a model that can process the target short circuit to obtain the calculated value of the short-circuit resistance index of the target transformer.

[0093] Exemplarily, in this embodiment, the target coil may be any short-circuit coil in the target transformer; the target short-circuit current may be the maximum short-circuit current, and the target short-circuit current is a specific value.

[0094] Exemplarily, the short-circuit impedance and current operating current of the target coil are pre-stored in the electronic device for subsequent direct retrieval.

[0095] Exemplarily, the first sub-model uses the product of the short-circuit impedance and the current operating current as the target short-circuit current of the target coil.

[0096] In some examples, the target short-circuit current is processed using the second sub-model to obtain a calculated value of the short-circuit resistance index of the target transformer, including:

[0097] Obtain target coil information of the target coil, the target coil information including at least one of coil name, coil position, system impedance, system zero-sequence impedance, neutral point grounding resistance, rated phase voltage, rated phase current, rated grounding impedance, number of turns, number of pads, pad width, number of stays, stay width, conductor elastic modulus, coil form, conductor shape, conductor form, and conductor yield strength;

[0098] The second sub-model is used to process the target short-circuit current and the target coil information to obtain the calculated value of the short-circuit resistance index of the target transformer. The calculated value of the short-circuit resistance index includes the calculated value of at least one of the radial bending safety factor, radial circumferential compression safety factor, axial bending safety factor, axial circumferential tensile safety factor, end insulation compression safety factor and winding temperature after short circuit of the target coil.

[0099] For example, the target coil information may include the coil name; for another example, the target coil information may include the coil name and the coil position; for another example, the target coil information may include the coil name, the coil position, the system impedance, the system zero-sequence impedance, the neutral point grounding resistance, the rated phase voltage, the rated phase current, the rated grounding impedance, the number of turns, the number of pads, the pad width, the number of struts, the strut width, the conductor elastic modulus, the coil form, the conductor shape, the conductor form and the conductor yield strength.

[0100] For example, the calculated value of the short-circuit resistance index includes the calculated value of the radial bending safety factor of the target coil; for another example, the calculated value of the short-circuit resistance index includes the calculated values ​​corresponding to the radial bending safety factor of the target coil and the winding temperature after short circuit; for another example, the calculated value of the short-circuit resistance index includes the calculated values ​​of each of the radial bending safety factor, radial circumferential compression safety factor, axial bending safety factor, axial circumferential tensile safety factor, end insulation compression safety factor and winding temperature after short circuit of the target coil.

[0101] Exemplarily, the target coil information is pre-stored in the electronic device for subsequent direct call.

[0102] Exemplarily, the second sub-model obtains the calculated value of the short-circuit resistance index of the target transformer by performing linear operations on the target coil information and the target short-circuit current. The specific linear operation process can be calculated according to material-related standards, national standards or IEC standards, which belongs to the prior art and will not be repeated here.

[0103] Exemplarily, the second sub-model includes coil name, coil position, system impedance, system zero-sequence impedance, neutral point grounding resistance, rated phase voltage, rated phase current, rated grounding impedance, number of turns, number of pads, pad width, number of stays, stay width, conductor elastic modulus, coil form, conductor shape, conductor form, conductor yield strength, axial bending stress, axial bending safety factor, protruding cross-sectional area, pad area, pad compression stress, pad compression safety factor, end insulation pad area, end insulation stress, end insulation compression safety factor, distortion coefficient, dynamic tilt coefficient, tilt force, allowable value of axial tilt force, end pressure, bottom pressure, annular tensile stress, annular compressive stress, maximum axial compressive force, radial electrodynamic force, radial bending stress, radial bending safety factor, annular compression safety factor, protruding thrust, axial stability safety factor, thermally stable short-circuit current, winding temperature after short circuit and other parameters.

[0104] Among them, in the calculation of transformer short-circuit force, the dynamic tilt coefficient is a coefficient used to consider the dynamic response characteristics of the transformer winding when it is short-circuited. When a transformer short-circuit fault occurs, the winding will be subjected to a huge electromagnetic force, and its dynamic characteristics are different from those in the static situation. The dynamic tilt coefficient is mainly used to measure the magnification of the dynamic deformation degree of the winding under the short-circuit impact relative to the static deformation degree.

[0105] In a transformer, the tilting force mainly refers to the force acting on the transformer winding to cause it to tilt and deform. When a short circuit occurs in the transformer, the short circuit current will generate huge electromagnetic forces in the winding. These electromagnetic forces include axial forces and radial forces. The tilting force can be regarded as the component of the combined force of these forces in a certain direction, which makes the winding tend to tilt in space.

[0106] The allowable value of axial tilt force refers to the maximum value of the axial tilt force allowed during the design and operation of the transformer. When the transformer winding is subjected to axial force, it may tilt and deform. In order to ensure the safe operation of the transformer, it is necessary to stipulate a reasonable upper limit of the axial tilt force, which is the allowable value of the axial tilt force. The allowable value of the axial tilt force is also the threshold value of the axial tilt force.

[0107] Annular tensile stress refers to the stress that acts on the circumferential direction of an annular object (such as a ring or a component of an annular structure), causing the annular object to have a tendency to stretch and deform. Imagine a ring. When an outward force is applied in the circumferential direction of the ring, the ring will produce tensile stress. From a microscopic point of view, this will cause the distance between atoms inside the annular material to tend to increase in the circumferential direction.

[0108] Annular compressive stress refers to the stress that acts on the circumference of an annular object and causes the annular object to have a tendency to compress and deform. In contrast to tensile stress, annular compressive stress is generated when an inward force is applied in the circumferential direction of the ring. This stress will cause the interatomic distance inside the annular material to tend to decrease in the circumferential direction.

[0109] It should be noted that under a specific working condition, one coil in a group of coils is subjected to pressure and the other is subjected to tension; only one of the two forces can appear and they cannot exist at the same time.

[0110] It is understandable that when calculating the calculated value of the short-circuit resistance index, each coil involved in the operation of each working condition under the three-phase symmetrical short-circuit condition is subjected to short-circuit resistance calculation. Under each three-phase symmetrical short-circuit condition, the short-circuit current of the participating coils is different, and the calculation results (i.e., the calculated value of the short-circuit resistance index) are also different. Take the working condition HR-MR as an example: the operating current of the high-voltage coil at this time is the high-voltage rated current. At this time, the first sub-model determines the maximum short-circuit current of the high-voltage coil according to the maximum short-circuit current of the high-voltage coil = high-voltage operating current * impedance value under this working condition (i.e., short-circuit impedance); the operating current of the medium-voltage coil at this time is the medium-voltage rated current. At this time, the first sub-model determines the maximum short-circuit current of the medium-voltage coil according to the maximum short-circuit current of the medium-voltage coil = medium-voltage operating current * impedance value under this working condition (i.e., short-circuit impedance); the second sub-model calculates the maximum short-circuit current of the high-voltage coil and the maximum short-circuit current of the medium-voltage coil to the high-voltage short-circuit coil and the medium-voltage short-circuit coil, and calculates the relevant data of the short-circuit force (i.e., the calculated value of the short-circuit resistance index). The maximum short-circuit current of the high-voltage coil and the maximum short-circuit current of the medium-voltage coil are the target short-circuit currents.

[0111] In some other embodiments, the single-phase short-circuit model includes a second sub-model and a third sub-model;

[0112] When the target short-circuit model includes a single-phase short-circuit model, the target short-circuit model is used to determine the calculated value of the short-circuit resistance index of the target transformer, including:

[0113] obtaining a coil system impedance and a coil impedance of a target coil in a target transformer;

[0114] The coil system impedance and the coil impedance are processed by using the third sub-model to obtain the target short-circuit current of the target coil;

[0115] The second sub-model is used to process the target short-circuit current to obtain a calculated value of the short-circuit resistance index of the target transformer.

[0116] Exemplarily, the third sub-model may be a model capable of processing the coil system impedance and the coil impedance to obtain a target short-circuit current of the target coil.

[0117] For example, in this embodiment, the target short-circuit current may be a maximum short-circuit current calculated according to the operating conditions, and the target short-circuit current is a specific value. The target coil may be any short-circuit coil in the target transformer.

[0118] Exemplarily, the coil system impedance and the coil impedance are pre-stored in the electronic device for subsequent direct retrieval.

[0119] Exemplarily, the third sub-model can calculate the current proportion of each participating coil and the overall short-circuit current multiple based on the coil system impedance and coil impedance of the short-circuit coil (i.e., the target coil); then the third sub-model can determine the short-circuit current of phase A, phase B, and phase C of each short-circuit coil based on the current proportion and the overall short-circuit current multiple; calculate the maximum short-circuit current based on the operating conditions, and then calculate various indicators to obtain the calculated value of the short-circuit resistance index of the target transformer.

[0120] It should be noted that the step of "using the second sub-model to process the target short-circuit current to obtain the calculated value of the short-circuit resistance index of the target transformer" is the same as the step in the above implementation method and will not be repeated here.

[0121] It is understandable that the determination of the calculated value of the short-circuit resistance index under the single-phase short-circuit condition requires the calculation of the short-circuit resistance of a coil under various single-phase short-circuit conditions, and then select the condition with the largest short-circuit current from these single-phase short-circuit conditions as the output of the single-phase to ground short-circuit resistance index (i.e., the calculated value of the short-circuit resistance index) of this coil in the subsequent transformer short-circuit resistance evaluation report. Take the high-voltage single-phase to ground rating as an example: the possible working conditions include HRLRWR, HRMRWR, HRMXWR, HRMNWR, HRL1RWR, HRL2WR, etc. These working conditions all need to calculate the high-voltage short-circuit situation under the high-voltage coil rated condition through the third sub-model. This working condition will calculate a maximum short-circuit current, and the corresponding calculated value of the high-voltage rated short-circuit coil is calculated through the second sub-model. In the high-voltage to ground rating, the maximum short-circuit calculated value of the high-voltage rated short-circuit coil under these working conditions is taken as the value of the high-voltage single-phase to ground rating (i.e., the calculated value of the short-circuit resistance index).

[0122] It should be noted that the short-circuit resistance indicators of different types of transformers are consistent.

[0123] In step S120, after obtaining the calculated value of the short-circuit resistance index of the target transformer, the electronic device may also evaluate the calculated value of the short-circuit resistance index according to the short-circuit resistance index threshold to obtain an evaluation result.

[0124] In some embodiments, the evaluation result includes a normal index, an over-standard index, and a seriously over-standard index; evaluating the calculated value of the anti-short-circuit index according to the anti-short-circuit index threshold to obtain the evaluation result, including: when the calculated value of the anti-short-circuit index is less than or equal to the anti-short-circuit index threshold, determining that the evaluation result is a normal index;

[0125] Alternatively, when the calculated value of the short-circuit resistance index is greater than the short-circuit resistance index threshold value and is less than or equal to the product of the preset coefficient and the short-circuit resistance index threshold value, the evaluation result is determined to be an over-standard index;

[0126] Alternatively, when the calculated value of the short-circuit resistance index is greater than the product of a preset coefficient and a short-circuit resistance index threshold, the evaluation result is determined to be a seriously exceeded index.

[0127] In this embodiment, the evaluation result can be quickly determined by comparing the short-circuit resistance index threshold with the calculated value of the short-circuit resistance index.

[0128] Exemplarily, the preset coefficient may be (1+b%), where the value range of b may be b greater than 0 and less than or equal to 5. For example, b may be 5.

[0129] In some embodiments, when the evaluation result is an over-standard index, the method further comprises: placing the calculated value of the short-circuit resistance index into an over-standard list;

[0130] Alternatively, when the assessment result is that the indicator is seriously exceeded, the method also includes:

[0131] The calculated value of the short-circuit resistance index is put into the excess list, and a serious excess mark is set at the position where the calculated value of the short-circuit resistance index is located.

[0132] In this embodiment, the calculated value of the short-circuit resistance index is placed in the exceeding list so that the calculated values ​​corresponding to the exceeding index and the seriously exceeding index can be directly derived later; the calculated value of the short-circuit resistance index is placed in the exceeding list, and a seriously exceeding mark is set at the position where the calculated value of the short-circuit resistance index is located, so that the seriously exceeding index can be determined more intuitively from the exceeding list.

[0133] It should be noted that if the evaluation results show normal indicators, no processing will be performed.

[0134] That is to say, Figure 4As shown, according to the working conditions of the coil of the target transformer and the position of the coil, different calculated values ​​of various indicators of the short-circuit coil (i.e., the calculated values ​​of the short-circuit resistance index) are compared with the standard threshold (i.e., the short-circuit resistance index threshold) to evaluate whether the calculated value exceeds the corresponding threshold (i.e., the short-circuit resistance index threshold). If not, it is considered normal and no processing is performed. If it exceeds the short-circuit resistance index threshold, the name and value of this calculated value are put into the excess list; then it is judged whether the calculated value of the short-circuit resistance index exceeds the allowable deviation threshold ((1+b%)*short-circuit resistance index threshold). If yes, a serious excess mark is made on the calculated value in the excess list; if not, no processing is performed; for the data in the excess list, if there is no serious excess mark, it is assumed to be just a little exceeded; finally, the data in the excess list can be exported to the evaluation abnormal data table.

[0135] In some embodiments, before evaluating the calculated value of the short-circuit resistance index according to the short-circuit resistance index threshold and obtaining the evaluation result, the method further includes:

[0136] The short-circuit resistance index threshold is determined according to the position of the target coil under different working conditions.

[0137] Exemplarily, the corresponding coefficient can be calculated according to the coil type, wire gauge type, wire gauge shape, force position, etc., and then the calculated coefficient is multiplied by the yield strength of the wire to obtain a first value; then, each maximum safety factor is calculated based on the first value, and each maximum safety factor is determined as the short-circuit resistance index threshold.

[0138] In other implementations, the short circuit resistance index threshold value may be pre-stored in the electronic device for subsequent direct call.

[0139] In step S130, the electronic device evaluates the calculated value of the short-circuit resistance index according to the short-circuit resistance index threshold and, after obtaining the evaluation result, can also generate a short-circuit resistance evaluation report of the target transformer according to the calculated value of the short-circuit resistance index and the evaluation result.

[0140] In some implementations, a short-circuit resistance evaluation report of a target transformer is generated according to the calculated value and evaluation result of the short-circuit resistance index, including:

[0141] Get the target output template;

[0142] The calculated value and evaluation result of the short-circuit resistance index are filled into the corresponding position in the target output template to generate a short-circuit resistance evaluation report for the target transformer.

[0143] In this implementation, the calculated value and evaluation result of the short-circuit resistance index are filled into the corresponding position in the target output template, so that the short-circuit resistance evaluation report of the target transformer can be automatically generated.

[0144] For example, the target output template can be an output template of the system default output format, or a preset Chinese standard template, a preset English standard template, or a preset Chinese and English standard template. In other words, the short-circuit resistance evaluation report of the target transformer can be three standard templates including Chinese and English, and can be expanded later as needed. According to different choices, the data format required by different templates can be output, or the standard template can be not used, and the short-circuit resistance evaluation report in the format required by the system output can be directly used.

[0145] In other embodiments, a short-circuit resistance evaluation report of a target transformer is generated based on the calculated value and evaluation result of the short-circuit resistance index, including: obtaining a target output template and a first type of data, the first type of data is used to characterize the design parameters of the target transformer, and filling the calculated value of the short-circuit resistance index, the evaluation result and the first type of data into corresponding positions in the target output template to generate a short-circuit resistance evaluation report for the target transformer.

[0146] Exemplarily, the short-circuit resistance assessment report may include basic product parameters, a summary of the short-circuit resistance calculation and analysis results, and the specific contents of the short-circuit resistance calculation and analysis. Among them, the basic product parameters may include the name of the declared category, the declared category serial number, the product model, technical parameters (such as structural form, voltage ratio, capacity, connection group, voltage regulation method and impedance voltage, etc.) and related drawings; the summary of the short-circuit resistance calculation and analysis results includes the radial stress safety factor, radial bending safety factor, axial bending safety factor, axial stability safety factor, pad compression safety factor, end insulation pressure group temperature, pressure ring compression safety factor and pull plate safety factor corresponding to at least two of the voltage stabilizing coil, low-voltage coil, medium-voltage coil, high-voltage coil, high-adjustment coil and medium-adjustment coil; the specific contents of the short-circuit resistance calculation and analysis include the parameters, calculation process and calculation results involved in the short-circuit current calculation corresponding to various conditions in the three-phase symmetrical short-circuit condition and the single-phase short-circuit condition. For example, the parameters involved in the short-circuit current calculation may include the rated current, impedance, rated capacitance and winding short-circuit current corresponding to at least one of the low voltage winding, medium voltage winding, high voltage winding, high-regulation winding and medium-regulation winding.

[0147] The embodiments of the present application have at least the following beneficial effects:

[0148] 1. The embodiment of the present application combines the electromagnetic calculation sheet with the short-circuit force calculation, and can directly realize the combination from the electromagnetic calculation sheet data to the short-circuit force calculation process, without the need for manual data input, calculation and other work in the middle, and creates a short-circuit force output model (i.e., the target short-circuit model) to meet the output of short-circuit force evaluation reports of various types of transformers and different output formats, and complete the automatic output of the short-circuit force evaluation report.

[0149] 2. The embodiments of the present application improve the efficiency of short-circuit force calculation, reduce the difficulty of short-circuit force calculation and evaluation report output, reduce manual work, reduce error rate, improve accuracy, and at the same time improve the timeliness of providing various types of anti-short-circuit evaluation reports.

[0150] 3. The embodiment of the present application standardizes the calculation process and output format of the transformer short-circuit resistance evaluation report, eliminating the occurrence of inconsistent report data due to human factors.

[0151] 4. The embodiment of the present application can not only be used to automatically generate a transformer short-circuit resistance evaluation report, but also can be used to calculate and evaluate the short-circuit force during the transformer design process, providing a reference for improvement direction of the design.

[0152] Example 4

[0153] like Figure 5 As shown, the transformer short-circuit resistance assessment report generation device provided in the embodiment of the present application may include a first acquisition module 210 , an assessment module 220 and a generation module 230 .

[0154] The first acquisition module 210 is used to obtain the calculated value of the short-circuit resistance index of the target transformer;

[0155] An evaluation module 220, connected to the first acquisition module 210, is used to evaluate the calculated value of the short-circuit resistance index according to the short-circuit resistance index threshold value to obtain an evaluation result, and the evaluation result is used to indicate whether the short-circuit resistance index is normal;

[0156] The generating module 230 is connected to the evaluating module 220, and generates a short-circuit resistance evaluation report of the target transformer according to the calculated value and evaluation result of the short-circuit resistance index.

[0157] In some embodiments, the evaluation results include normal indicators, excessive indicators, and seriously excessive indicators;

[0158] The evaluation module 220 is specifically configured to:

[0159] When the calculated value of the short-circuit resistance index is less than or equal to the short-circuit resistance index threshold, the evaluation result is determined to be a normal index;

[0160] or,

[0161] When the calculated value of the short-circuit resistance index is greater than the short-circuit resistance index threshold value and is less than or equal to the product of the preset coefficient and the short-circuit resistance index threshold value, the evaluation result is determined to be an over-standard index;

[0162] or,

[0163] When the calculated value of the short-circuit resistance index is greater than the product of the preset coefficient and the short-circuit resistance index threshold, the evaluation result is determined to be a seriously exceeded index.

[0164] In some implementations, the generating module 230 is specifically configured to:

[0165] Get the target output template;

[0166] Fill the calculated value and evaluation result of the short-circuit resistance index into the corresponding position in the target output template to generate a short-circuit resistance evaluation report of the target transformer;

[0167] or,

[0168] Obtain a target output template and first-category data, where the first-category data is used to characterize design parameters of a target transformer;

[0169] The calculated value of the short-circuit resistance index, the evaluation result and the first type of data are filled into the corresponding positions in the target output template to generate a short-circuit resistance evaluation report for the target transformer.

[0170] In some implementations, the first acquisition module 210 is specifically configured to:

[0171] Acquire first data and a coil type of a target transformer, wherein the first data includes first-category data and second-category data, wherein the first-category data is used to characterize design parameters of the target transformer, and the second-category data is used to characterize calculation data of an electromagnetic calculation sheet of the target transformer;

[0172] According to the first data and the coil type, a target short-circuit model is constructed, wherein the target short-circuit model includes a three-phase symmetrical short-circuit model and a single-phase short-circuit model, or includes a three-phase symmetrical short-circuit model; the three-phase symmetrical short-circuit model and the single-phase short-circuit model have the same short-circuit resistance index output;

[0173] The target short-circuit model is used to determine the calculated value of the short-circuit resistance index of the target transformer.

[0174] The transformer short-circuit resistance assessment report generation device provided in the embodiment of the present application can be used to execute the transformer short-circuit resistance assessment report generation method, that is, it has the beneficial effects and implementation methods of the transformer short-circuit resistance assessment report generation method provided in Example 1 of the present application. For details, please refer to the specific description of the transformer short-circuit resistance assessment report generation method in the above Example 1, which will not be repeated in this embodiment.

[0175] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present application, but the present application is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of the present application, and these modifications and improvements are also considered to be within the scope of protection of the present application.

Claims

1. A method for generating a transformer short-circuit resistance assessment report, characterized in that: include: Obtaining a calculated value of a short-circuit resistance index of a target transformer; Evaluate the calculated value of the short-circuit resistance index according to the short-circuit resistance index threshold value to obtain an evaluation result, wherein the evaluation result is used to indicate whether the short-circuit resistance index is normal; A short-circuit resistance evaluation report of the target transformer is generated according to the calculated value of the short-circuit resistance index and the evaluation result.

2. The method according to claim 1, characterized in that: The evaluation results include normal indicators, indicators exceeding the standard and indicators seriously exceeding the standard; The calculated value of the short-circuit resistance index is evaluated according to the short-circuit resistance index threshold value to obtain an evaluation result, including: When the calculated value of the short-circuit resistance index is less than or equal to the short-circuit resistance index threshold, determining that the evaluation result is a normal index; or, When the calculated value of the short-circuit resistance index is greater than the short-circuit resistance index threshold value and is less than or equal to the product of a preset coefficient and the short-circuit resistance index threshold value, determining that the evaluation result is an over-standard index; or, When the calculated value of the short-circuit resistance index is greater than the product of the preset coefficient and the short-circuit resistance index threshold, the evaluation result is determined to be a seriously exceeded index.

3. The method according to claim 2, characterized in that When the evaluation result is an over-standard indicator, the method further includes: Putting the calculated value of the short-circuit resistance index into an excess list; or, When the evaluation result is a serious over-standard indicator, the method further includes: The calculated value of the short-circuit resistance index is put into an over-standard list, and a serious over-standard mark is set at the position where the calculated value of the short-circuit resistance index is located.

4. The method according to claim 1, characterized in that: Generating a short-circuit resistance evaluation report of the target transformer according to the calculated value of the short-circuit resistance index and the evaluation result, including: Get the target output template; Filling the calculated value of the short-circuit resistance index and the evaluation result into corresponding positions in the target output template to generate a short-circuit resistance evaluation report of the target transformer; or, Obtaining a target output template and first-category data, where the first-category data is used to characterize design parameters of the target transformer; The calculated value of the short-circuit resistance index, the evaluation result and the first type of data are filled into corresponding positions in the target output template to generate a short-circuit resistance evaluation report for the target transformer.

5. The method according to claim 1, characterized in that Obtain the calculated value of the short-circuit resistance index of the target transformer, including: Acquire first data and a coil type of a target transformer, wherein the first data includes first-category data and second-category data, wherein the first-category data is used to characterize design parameters of the target transformer, and the second-category data is used to characterize calculation data of an electromagnetic calculation sheet of the target transformer; According to the first data and the coil type, a target short-circuit model is constructed, wherein the target short-circuit model includes a three-phase symmetrical short-circuit model and a single-phase short-circuit model, or includes a three-phase symmetrical short-circuit model; the short-circuit resistance index output by the three-phase symmetrical short-circuit model and the single-phase short-circuit model is the same; The target short-circuit model is used to determine a calculated value of a short-circuit resistance index of a target transformer.

6. The method according to claim 5, characterized in that According to the first data and the coil type, a target short-circuit model is constructed, including: Get the target type of the target transformer; According to the target type, the second type of data is standardized to obtain second data; A target short-circuit model is constructed according to the second data, the first type of data and the coil type.

7. The method according to claim 6, characterized in that According to the target type, the second type of data is standardized to obtain second data, including: According to the target type and the first mapping relationship, a target transformer general model is determined from a plurality of transformer general models, wherein the transformer general model includes transformer type, whether axial splitting is performed, whether medium voltage regulation is performed, a basic data module, a core module, and a coil module; different transformer types correspond to different type tags; the first mapping relationship is a correspondence between a plurality of transformer types and a plurality of transformer general models; The second type of data is filled into the corresponding position of the target transformer general model to complete the standardization processing of the second type of data and obtain the second data.

8. The method according to claim 6, characterized in that The step of constructing a target short-circuit model according to the second data, the first type of data and the coil type includes: In the case where the coil type includes a voltage stabilizing coil, constructing a three-phase symmetrical short-circuit model and a single-phase short-circuit model according to the second data and the first type of data; When the coil type does not include a voltage stabilizing coil, a three-phase symmetrical short-circuit model is constructed according to the second data and the first type of data.

9. The method according to claim 5, characterized in that The three-phase symmetrical short-circuit model includes a first sub-model and a second sub-model; When the target short-circuit model includes a three-phase symmetrical short-circuit model, the target short-circuit model is used to determine a calculated value of the short-circuit resistance index of the target transformer, including: Obtaining the short-circuit impedance and current operating current of the target coil in the target transformer; The first sub-model is used to process the short-circuit impedance and the current operating current to obtain a target short-circuit current of the target coil; The target short-circuit current is processed using the second sub-model to obtain a calculated value of the short-circuit resistance index of the target transformer.

10. The method according to claim 5, characterized in that The single-phase short-circuit model includes a second sub-model and a third sub-model; When the target short-circuit model includes a single-phase short-circuit model, the target short-circuit model is used to determine a calculated value of the short-circuit resistance index of the target transformer, including: Obtaining a coil system impedance and the coil impedance of a target coil in a target transformer; The coil system impedance and the coil impedance are processed by using the third sub-model to obtain a target short-circuit current of the target coil; The target short-circuit current is processed using the second sub-model to obtain a calculated value of the short-circuit resistance index of the target transformer.

11. The method according to claim 9 or 10, characterized in that: The target short-circuit current is processed by the second sub-model to obtain a calculated value of the short-circuit resistance index of the target transformer, including: Obtain target coil information of the target coil, wherein the target coil information includes at least one of coil name, coil position, system impedance, system zero-sequence impedance, neutral point grounding resistance, rated phase voltage, rated phase current, rated grounding impedance, number of turns, number of pads, pad width, number of stays, stay width, conductor elastic modulus, coil form, conductor shape, conductor form, and conductor yield strength; The target short-circuit current and the target coil information are processed using the second sub-model to obtain a calculated value of the short-circuit resistance index of the target transformer, wherein the calculated value of the short-circuit resistance index includes at least one of the radial bending safety factor, radial circumferential compression safety factor, axial bending safety factor, axial circumferential tensile safety factor, end insulation compression safety factor and winding temperature after short circuit of the target coil.

12. A transformer short-circuit resistance assessment report generation device, characterized in that: include: A first acquisition module is used to obtain a calculated value of a short-circuit resistance index of a target transformer; An evaluation module, connected to the first acquisition module, for evaluating the calculated value of the short-circuit resistance index according to the short-circuit resistance index threshold value to obtain an evaluation result, wherein the evaluation result is used to indicate whether the short-circuit resistance index is normal; A generating module is connected to the evaluating module, and generates a short-circuit resistance evaluation report of the target transformer according to the calculated value of the short-circuit resistance index and the evaluation result.

13. The device according to claim 12, characterized in that The evaluation results include normal indicators, indicators exceeding the standard and indicators seriously exceeding the standard; The evaluation module is specifically used for: When the calculated value of the short-circuit resistance index is less than or equal to the short-circuit resistance index threshold, determining that the evaluation result is a normal index; or, When the calculated value of the short-circuit resistance index is greater than the short-circuit resistance index threshold value and is less than or equal to the product of a preset coefficient and the short-circuit resistance index threshold value, determining that the evaluation result is an over-standard index; or, In the case where the calculated value of the short-circuit resistance index is greater than the product of the preset coefficient and the short-circuit resistance index threshold, determining that the evaluation result is a seriously exceeded index; and / or, The generation module is specifically used for: Get the target output template; Filling the calculated value of the short-circuit resistance index and the evaluation result into corresponding positions in the target output template to generate a short-circuit resistance evaluation report of the target transformer; or, Obtaining a target output template and first-category data, where the first-category data is used to characterize design parameters of the target transformer; Filling the calculated value of the short-circuit resistance index, the evaluation result and the first type of data into corresponding positions in the target output template to generate a short-circuit resistance evaluation report of the target transformer; And / or, the first acquisition module is specifically used to: Acquire first data and a coil type of a target transformer, wherein the first data includes first-category data and second-category data, wherein the first-category data is used to characterize design parameters of the target transformer, and the second-category data is used to characterize calculation data of an electromagnetic calculation sheet of the target transformer; According to the first data and the coil type, a target short-circuit model is constructed, wherein the target short-circuit model includes a three-phase symmetrical short-circuit model and a single-phase short-circuit model, or includes a three-phase symmetrical short-circuit model; the short-circuit resistance index output by the three-phase symmetrical short-circuit model and the single-phase short-circuit model is the same; The target short-circuit model is used to determine a calculated value of a short-circuit resistance index of a target transformer.

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