Method and device for determining anti-short-circuit strength of transformer, medium and equipment
By determining the loss and stress parameters of the transformer, calculating the temperature and displacement parameters, accurately determining the short-circuit resistance of the transformer, the problem of inaccurate results in the prior art is solved, and accurate strength determination is achieved.
Patent Information
- Application Number
- CN202411528582.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-03-14
AI Technical Summary
The prior art cannot accurately determine the short-circuit resistance strength of the transformer, resulting in inaccurate results.
By determining the loss parameters and stress parameters of the target transformer, the temperature parameters and winding displacement of each target part are calculated based on these parameters, so as to accurately determine the short-circuit resistance of the transformer.
Accurate determination of the transformer's short-circuit strength is achieved, and the problem of inaccurate results in the prior art is solved.
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Figure CN119619920A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of power electronic devices, and in particular to a method, device, medium and equipment for determining the short-circuit strength of a transformer. Background Art
[0002] During the use of the transformer, its temperature will rise, and the temperature increase will lead to a decrease in the stability of the winding, which will cause a short circuit. Therefore, it is very important to determine the short-circuit strength of the transformer. However, the existing method for determining the short-circuit strength of the transformer has the problem of inaccurate results.
[0003] Therefore, a method for determining the short-circuit strength of a transformer is urgently needed to solve the problem that the short-circuit strength of the transformer cannot be accurately determined in the prior art. Summary of the invention
[0004] In view of this, the present invention provides a method, device medium, and equipment for determining the short-circuit strength of a transformer, the main purpose of which is to solve the current problem that the short-circuit strength of a transformer cannot be accurately determined.
[0005] In order to solve the above problems, the present application provides a method for determining the short-circuit strength of a transformer, comprising:
[0006] Determine the loss parameters of the target transformer;
[0007] Determine the stress parameters of the target transformer;
[0008] Determining temperature parameters of several target parts of the target transformer based on the loss parameters of the target transformer;
[0009] Based on the stress parameters and the temperature parameters of each target part, a target winding displacement of the target transformer is determined, so as to determine a target short-circuit strength of the target transformer based on the target winding displacement.
[0010] Optionally, the loss parameters include no-load loss and load loss;
[0011] The obtaining of loss parameters of the target transformer includes:
[0012] Determine the hysteresis loss and the first eddy current loss of the target transformer in a no-load operation state;
[0013] Determine the DC resistance loss and the second eddy current loss of the target transformer under load operation state;
[0014] determining a no-load loss based at least on the hysteresis loss and the first eddy current loss;
[0015] A load loss is determined based on the DC resistance loss and the second eddy current loss.
[0016] Optionally, the determining of the stress parameters of the target transformer specifically includes:
[0017] The radial electromagnetic force and the axial electromagnetic force of the target transformer in the short-circuit state are determined to obtain the force parameters.
[0018] Optionally, determining the temperature parameters of several target parts of the target transformer based on the loss parameters of the target transformer specifically includes:
[0019] Dividing the target transformer into regions to obtain a number of grid units;
[0020] Based on the loss parameters of the target transformer and the location information of each grid unit in the target transformer, determine the temperature of the location object corresponding to each grid unit;
[0021] Based on the temperature of each of the object parts, the temperature parameters of each of the target parts of the target transformer are determined.
[0022] Optionally, the part information includes location information and component parameters of a component object, and the component object includes any one or more of the following: an iron core, a spacer, a stay, a high-voltage winding, and a medium-voltage winding.
[0023] Optionally, determining a target winding displacement of the target transformer based on the stress parameter and the temperature parameter of each target part, so as to determine a target short-circuit strength of the target transformer based on the target winding displacement, specifically includes:
[0024] Determining the initial winding displacement of each target part based on the force parameter and the temperature parameter of each target part;
[0025] Based on the initial winding displacement of each target position, a target winding displacement of the target transformer is determined, so as to determine a target short-circuit strength of the target transformer based on the target winding displacement.
[0026] Optionally, determining a target short-circuit strength of the target transformer based on the target winding displacement specifically includes:
[0027] Based on the target winding displacement and the preset corresponding relationship between each winding displacement and each short-circuit resistance strength, the target short-circuit resistance strength corresponding to the target winding displacement is determined.
[0028] In order to solve the above problems, the present application provides a device for determining the short-circuit strength of a transformer, comprising:
[0029] A first determination module, used to determine the loss parameters of the target transformer;
[0030] A second determination module is used to determine the stress parameters of the target transformer;
[0031] A third determination module is used to determine temperature parameters of several target parts of the target transformer;
[0032] A determination module is used to determine a target winding displacement of the target transformer based on the stress parameter and the temperature parameters of each target part, so as to determine a target short-circuit strength of the target transformer based on the target winding displacement.
[0033] In order to solve the above problems, the present application provides a storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the steps of any of the above methods for determining the short-circuit strength of a transformer are implemented.
[0034] To solve the above problems, the present application provides an electronic device, comprising at least a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of any of the above-mentioned methods for determining the short-circuit strength of a transformer when executing the computer program on the memory.
[0035] The present application discloses a method, device, medium and equipment for determining the short-circuit strength of a transformer. By determining the temperature parameters of each target part based on the loss parameters, and then combining the force parameters of the target transformer, the winding displacement corresponding to each part can be accurately determined, so that the target winding displacement can be determined from each winding displacement, and then the short-circuit strength of the target transformer can be accurately determined according to the target winding displacement, which solves the problem of inaccurate results in determining the short-circuit strength of the transformer in the prior art.
[0036] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS
[0037] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:
[0038] Figure 1 This is a flow chart of a method for determining the short-circuit strength of a transformer according to an embodiment of the present application;
[0039] Figure 2 This is a structural block diagram of a device for determining the short-circuit strength of a transformer according to another embodiment of the present application;
[0040] Figure 3A structural block diagram of an electronic device is provided for another embodiment of the present application. DETAILED DESCRIPTION
[0041] Various aspects and features of the present application are described herein with reference to the accompanying drawings.
[0042] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of an embodiment. Other modifications within the scope and spirit of the present application will occur to those skilled in the art.
[0043] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.
[0044] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.
[0045] It should also be understood that although the present application has been described with reference to some specific examples, those skilled in the art will be able to readily implement many other equivalent forms of the present application.
[0046] The above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.
[0047] Specific embodiments of the present application are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments applied for are merely examples of the present application, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that obscure the present application. Therefore, the specific structural and functional details applied for herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any suitable detailed structure.
[0048] This specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present application.
[0049] The present application embodiment provides a method for determining the short-circuit strength of a transformer, which can be specifically applied to electronic devices such as terminals and servers, such as Figure 1 As shown, the method in this embodiment includes the following steps:
[0050] Step S101, determining the loss parameters of the target transformer;
[0051] In the specific implementation process of this step, the loss parameters include no-load loss and load loss;
[0052] Step S102, determining the stress parameters of the target transformer;
[0053] During the specific implementation of this step, the force parameters include radial electromagnetic force and axial electromagnetic force.
[0054] Step S103, determining temperature parameters of several target parts of the target transformer based on the loss parameters of the target transformer;
[0055] In this step, the target part can be the iron core, pad, stay, high-voltage winding, medium-voltage winding and other parts of the transformer. Specifically, the transformer can be divided into several grid units by gridding, and then the transformer part corresponding to each grid unit is used as the target part, or the transformer parts corresponding to several adjacent grid units are used as the target part. Then, the temperature of each part is determined by combining the location information of each part, the component object and the loss parameter and other parameter information, that is, the uneven temperature of the target transformer is obtained by coupling.
[0056] Step S104, determining a target winding displacement of the target transformer based on the stress parameters and the temperature parameters of each target part, so as to determine a target short-circuit strength of the target transformer based on the target winding displacement.
[0057] In this step, by determining the temperature parameters of each target part based on the loss parameters and then combining them with the force parameters of the target transformer, the winding displacement corresponding to each part can be accurately determined, thereby determining the maximum displacement from each winding displacement as the target winding displacement, so that the short-circuit strength of the target transformer can be determined according to the target winding displacement.
[0058] The method of this embodiment can accurately determine the winding displacement corresponding to each part by determining the temperature parameters of each target part based on the loss parameters and then combining the force parameters of the target transformer, so that the target winding displacement can be determined from each winding displacement, and then the short-circuit strength of the target transformer can be accurately determined according to the target winding displacement, which solves the problem of inaccurate determination results of the short-circuit strength of the transformer in the prior art.
[0059] Based on the above embodiments, another embodiment of the present application provides a method for determining the short-circuit strength of a transformer, which specifically includes the following steps:
[0060] Step S201, obtaining loss parameters of a target transformer;
[0061] In this step, the loss parameters include no-load loss and load loss. In the specific implementation process, it specifically includes:
[0062] Step S201-1, determining the hysteresis loss P of the target transformer in the no-load operation state h And the first eddy current loss P e ; Determine the no-load loss based at least on the hysteresis loss and the first eddy current loss.
[0063] Among them, the hysteresis loss P h The calculation formula is as follows:
[0064]
[0065] The first eddy current loss P e The calculation formula is as follows:
[0066]
[0067] Where C1 and C2 are the correlation coefficients of the core hysteresis loss and the first eddy current loss material properties; V is the core volume, m 3 ; B m is the maximum magnetic induction intensity, T; f is the frequency of the external power supply current, Hz; d is the thickness of a single layer of silicon steel sheet, mm. Hysteresis loss and eddy current loss are the main factors that cause the operating temperature rise of the transformer core. Therefore, the target transformer temperature can be determined based on hysteresis loss and eddy current loss. Hysteresis loss is the loss caused by the hysteresis phenomenon of the core caused by the periodic change of current, and eddy current loss is the loss caused by the circulating effect caused by the electromagnetic induction phenomenon.
[0068] The calculation formula of no-load loss P0 is as follows:
[0069] P0=P h +P e +P s (3)
[0070] Among them, P0 is the no-load loss; P h is the hysteresis loss; P e is the eddy current loss; P s is the additional loss, W.
[0071] Step S201-2, determining the DC resistance loss and the second eddy current loss of the target transformer under load operation; based on the DC resistance loss P D And the second eddy current loss P W , determine the load loss P L .
[0072] Among them, the DC resistance loss P D The calculation formula is as follows:
[0073]
[0074] Among them, the second eddy current loss P W The calculation formula is as follows:
[0075]
[0076] Among them, P Whi , P Wri is the longitudinal and transverse eddy current loss of each winding, W; R i is the distance from each winding to the center axis of the core, m; σ is the conductivity, S / m; ω is the angular frequency, rad / s; a and b are the thickness and width of the wire, m; S i is the conductor area, m 2 ; B hi , B ri are the longitudinal and transverse magnetic flux densities within the i-th unit, T.
[0077] Load loss P L The calculation formula is as follows:
[0078] P L =P D +P W (8)
[0079] Where P L is the load loss; P D is the DC resistance loss; P W is the eddy current loss, W.
[0080] Step S202, determining the stress parameters of the target transformer;
[0081] In this step, the force parameters include radial electromagnetic force and axial electromagnetic force. In the specific implementation process, the following steps are included:
[0082] Step S202-1, determining the radial electromagnetic force of the target transformer in a short-circuit state;
[0083] The calculation formula of the radial electromagnetic force in this step is as follows:
[0084] F r =B zave I dmax l ave W (9)
[0085]
[0086] In the formula, B zave is the average axial flux density, B zave =B m / 2, T; I dmax is the maximum short-circuit current amplitude, A; l ave is the average circumference of each turn of wire, m; kch is the short-circuit current impulse coefficient, B m is the maximum magnetic leakage, H k is the reactance height; W represents the number of winding turns; ρ s Represents the Rockwell coefficient.
[0087] Step S202-2, determining the axial electromagnetic force of the target transformer in a short-circuit state;
[0088] The calculation formula of the axial electromagnetic force in this step is as follows:
[0089]
[0090] In the formula, ρ s represents the transverse Rockwell coefficient, λ represents the axial height of the leakage flux, cm; I dmax is the maximum short-circuit current amplitude; R pj It represents the average radius of the winding, m; W represents the number of turns of the winding.
[0091] Step S203, divide the target transformer into regions to obtain a plurality of grid units; determine the temperature of the part object corresponding to each grid unit based on the loss parameter of the target transformer and the part information of the target transformer where each grid unit is located; determine the temperature parameter of each target part of the target transformer based on the temperature of each part object.
[0092] In this step, the part information includes position information and component parameters of the component object, and the component object includes any one or more of the following: iron core, spacer, stay, high voltage winding, medium voltage winding. The component parameters can be the diameter of the core column, the height of the core window, the width of the spacer, the width of the stay, the number of turns of the high / medium voltage winding, the electrical density of the high voltage winding, the electrical density of the medium voltage winding, etc.
[0093] In the specific implementation process of this step, the computational domain (target transformer) is divided into many small control volumes (similar to the units in the finite element method, but based on the finite volume method) using finite elements. For the energy equation, discretization is performed on each control volume.
[0094] For the division of the grid, due to the transformer winding structure, the struts, spacers, core and other structural parts are relatively regular, so the paving method is adopted. First, the surface is scanned two-dimensionally, and the grid units are laid layer by layer from the outside to the inside on the same two-dimensional surface until the entire analysis area is completely filled, forming its basic execution framework.
[0095] First, perform mesh control of points and two-dimensional surfaces. After completing the two-dimensional surface segmentation, it is necessary to define the thickness, height and other geometric information of the three-dimensional object to expand the two-dimensional surface into a three-dimensional body. This can be achieved by specifying the size of the three-dimensional object in the direction perpendicular to the two-dimensional surface. The transformer body is a relatively uniform object. For example, the core is stacked by laminations, and the windings are uniform rings. Therefore, using this method for mesh segmentation is conducive to improving the calculation speed.
[0096] The paving method starts from the edge of the area and gradually lays out the grid units from the outside to the inside until the entire analysis area is completely covered, thereby constructing a basic execution framework. In this process, the algorithm will carefully detect and process the intersection of the grid units. Once overlap occurs, an appropriate processing strategy will be used to generate valid grid units. The grid generated by this method is not only compact and perpendicular to the boundary, but also can form an approximately square shape, while achieving precise control of the unit size. In summary, the paving method shows extremely high adaptability in dealing with complex boundary shapes, and also demonstrates significant effectiveness in finite element mesh generation.
[0097] The starting point of the paving method is one or more groups of closed node rings arranged in an orderly manner, regardless of the pre-arranged internal nodes. During the mesh generation process, the nodes and mesh cells in the area will be automatically created and configured. The generation of mesh cells follows the counterclockwise direction of the external boundary and the clockwise direction of the internal boundary. In the case of the intersection of the internal and external boundaries, a new external paving boundary is formed by intersection processing. The filling of each layer of cells starts with selecting the node with the smallest internal angle, and ensures that the nodes on the fixed boundary do not change during the filling process. It is usually required that each filled boundary contains an even number of nodes, the purpose of which is to ensure that the subsequent quadrilateral mesh is a full quadrilateral topology. In a two-dimensional grid, the node spacing on the fixed boundary initially determines the size of the unit, and this spacing is kept as unchanged as possible during the filling process. The unit size of the entire grid can be flexibly controlled by adjusting the node spacing on the boundary, and the generation of internal grid nodes is transitive.
[0098] By using the equivalent thermal network method, the global temperature field of each structural component of the equivalent transformer is divided using orthogonal grids.
[0099] The outer side of the magnetic wire of the oil-immersed transformer winding is usually wrapped with 2-3 layers of insulating paper. The heat generated by the magnetic wire penetrates multiple layers of insulating paper and multiple contact surfaces. Due to the body thermal resistance of the insulating paper and the contact thermal resistance of the contact surface, multiple obvious temperature drops are formed on the heat transfer path. The contact gap of the oil-immersed insulating paper is filled with transformer oil. Since the natural convection boundary layer cannot develop, in the analysis of the heat transfer performance of the insulating paper-insulating paper and insulating paper-copper contact surfaces, only the heat conduction in the actual contact point and the gap insulating oil is considered by heat conduction. Based on the "parallel" relationship between the contact point thermal resistance Rcom and the gap thermal resistance Rgap, and the "series" relationship between the contact thermal resistance Rtcr and the body thermal resistance Rbod, the winding heat transfer process can be equivalent to the figure.
[0100] Based on the one-dimensional Fourier steady-state heat conduction law, where P is the heating power, L is the temperature measurement point between the evaporation section and the condensation section, A is the heat transfer area, and ΔT is the average temperature difference between the evaporation section and the condensation section.
[0101]
[0102] Thermal resistance test was performed using the heat flow meter method.
[0103] A material with a known thermal conductivity λ0 is selected as a heat flow meter, and the sample to be tested is placed between the upper and lower heat flow meters. A heating end and a cooling system are respectively set at both ends of the heat flow meter. When heat is transferred from the hot end to the cold end, a temperature gradient is formed in the heat flow meter. The end surface temperature of the heat flow meter can be deduced from the temperature gradient of the heat flow meter, and the temperature difference ΔT between the upper and lower surfaces of the sample to be tested can also be calculated. The thermal parameters of the wire are determined by calculating the temperature difference ΔT, and the formula coefficients are determined.
[0104] Under the same temperature, pressure load and contact conditions, the functional relationship between the unit area thermal resistance and thickness can be fitted by measuring the unit area thermal resistance of samples of different thicknesses. The unit area thermal resistance when the sample thickness is zero is the contact thermal resistance formed between the sample and the heat flow meter, which realizes the separation of the sample body thermal resistance and the contact thermal resistance. By determining the thermal resistance, the thermal network model can be planned, and the thermal network determines the temperature of the network structure. With the same nodes, the temperature results can be directly coupled.
[0105] The oil flow in the transformer winding has boundary layer characteristics. The oil flow boundary layer in the vertical oil channel is formed near the lower edge of the winding coil. Under the interaction of viscous force and inertial force, the boundary layer moves along the coil surface to the upper edge of the coil, merges with the horizontal oil channel boundary layer at the upper edge of the coil, and separates at a certain distance.
[0106] The heat flux of any microelement in the temperature field is conserved. Based on the similarity between heat transfer and electricity, an RCT thermal circuit model similar to the RC circuit model is constructed. According to the thermoelectric analogy principle, the heat generated by the magnetic wire and the iron core is equivalent to a DC current source, and the corresponding temperature is the average temperature T of the magnetic wire. The transverse and longitudinal heat transfer thermal resistance Re is equivalent to a resistor.
[0107] The “node heat flow equation” in the spatial thermal circuit model of the oil-immersed transformer is listed. The following equation can be established by selecting the i-th node of the high-voltage winding in the thermal circuit model:
[0108]
[0109] Spatial thermal circuit model of oil-immersed transformer, Φ H,i T represents the loss of each segment of each segment winding, the subscripts LH represent the high and low voltage windings respectively, YOU represents the transformer oil, and s, x, z, and y represent the upper, lower, left, and right sides of the winding unit in contact with the transformer oil. H,i is the conductor node temperature. The high and low voltage windings are composed of N winding sections respectively.
[0110]
[0111] The subscript TX represents the transformer core, and t and b represent the top and bottom layers of the transformer.
[0112]
[0113] By using the above formula, according to the material corresponding to each grid point (core, spacer, stay, high-voltage winding, medium-voltage winding, etc.), the temperature parameter corresponding to each point / grid unit can be calculated.
[0114] By using the equivalent thermal network method, orthogonal grids are used to divide the global temperature field of each structural part of the transformer (obtaining grid units). It is divided into windings, insulation, struts, pads, heat dissipation and other parts, and each separation is independently performed with thermal resistance. The temperature results obtained by the solution are calculated with the corresponding nodes, especially the transformer body, using consistent grid division, so as to realize the finite element analysis of the transformer winding strength considering the temperature. The advantage is the custom control of the grid, which maintains the consistency of the finite element nodes and prevents the occurrence of multiple different parameters in the same node. The split error caused by the appearance of multiple different parameters, at the same time, the thermal circuit model has a small amount of calculation. Considering the complexity of the electromagnetic-temperature-structure multi-physics field coupling, it can effectively shorten the calculation time. At the same time, according to different operating conditions of the transformer, the parameters can be adaptively adjusted to achieve fast calculation.
[0115] Step S204, determining a target winding displacement of the target transformer based on the stress parameters and the temperature parameters of each target part, so as to determine a target short-circuit strength of the target transformer based on the target winding displacement.
[0116] In this step, by determining the temperature parameters of each target part based on the loss parameters and then combining them with the force parameters of the target transformer, the winding displacement corresponding to each part can be accurately determined, thereby determining the maximum displacement from each winding displacement as the target winding displacement, so that the short-circuit strength of the target transformer can be determined according to the target winding displacement.
[0117] In this embodiment, the greater the winding displacement, the smaller the short-circuit strength, so the corresponding relationship between each winding displacement and each short-circuit strength can be established in advance. Therefore, after obtaining the target winding displacement, the corresponding relationship can be searched to determine the target short-circuit strength corresponding to the target winding displacement.
[0118] The method of this embodiment determines the temperature parameters of each target part based on the loss parameters, and then can accurately determine the winding displacement corresponding to each part in combination with the force parameters of the target transformer, so that the target winding displacement can be determined from each winding displacement, and then the short-circuit strength of the target transformer can be accurately determined according to the target winding displacement, which solves the problem of inaccurate determination results of the short-circuit strength of the transformer in the prior art.
[0119] Another embodiment of the present application provides a device for determining the short-circuit strength of a transformer, such as Figure 2 As shown, including:
[0120] A first determination module 11 is used to determine the loss parameters of the target transformer;
[0121] A second determination module 12, used to determine the stress parameters of the target transformer;
[0122] A third determination module 13 is used to determine temperature parameters of several target parts of the target transformer based on the loss parameters of the target transformer;
[0123] The determination module 14 is used to determine the target winding displacement of the target transformer based on the stress parameter and the temperature parameters of each target part, so as to determine the target short-circuit strength of the target transformer based on the target winding displacement.
[0124] In the specific implementation process of this embodiment, the loss parameters include no-load loss and load loss; the first determination module is specifically used to: determine the hysteresis loss and the first eddy current loss of the target transformer in the no-load operation state; determine the DC resistance loss and the second eddy current loss of the target transformer in the load operation state; determine the no-load loss based on at least the hysteresis loss and the first eddy current loss; determine the load loss based on the DC resistance loss and the second eddy current loss.
[0125] In the specific implementation process of this embodiment, the second determination module is specifically used to: determine the radial electromagnetic force and the axial electromagnetic force of the target transformer in the short-circuit state to obtain the force parameters.
[0126] In the specific implementation process of this embodiment, the third determination module is specifically used to: divide the target transformer into regions to obtain a plurality of grid units; determine the temperature of the part object corresponding to each of the grid units based on the loss parameters of the target transformer and the position information of each grid unit in the target transformer; determine the temperature parameters of each of the target parts of the target transformer based on the temperature of each of the part objects.
[0127] In the specific implementation process of this embodiment, the part information includes position information and component parameters of the component object, and the component object includes any one or more of the following: iron core, spacer, stay, high voltage winding, medium voltage winding.
[0128] In the specific implementation process of this embodiment, the determination module is specifically used to: determine the initial winding displacement of each target part based on the force parameters and the temperature parameters of each target part; determine the target winding displacement of the target transformer based on the initial winding displacement of each target part, so as to determine the target short-circuit strength of the target transformer based on the target winding displacement.
[0129] In the specific implementation of this embodiment, the determination module is specifically used to determine the target short-circuit strength corresponding to the target winding displacement based on the target winding displacement and the preset corresponding relationship between each winding displacement and each short-circuit strength.
[0130] The device of this embodiment can accurately determine the winding displacement corresponding to each part by determining the temperature parameters of each target part based on the loss parameters and then combining the force parameters of the target transformer, so that the target winding displacement can be determined from each winding displacement, and then the short-circuit strength of the target transformer can be accurately determined according to the target winding displacement, which solves the problem of inaccurate determination results of the short-circuit strength of the transformer in the prior art.
[0131] Another embodiment of the present application provides a storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the following method steps are implemented:
[0132] Step 1: Determine the loss parameters of the target transformer;
[0133] Step 2: Determine the stress parameters of the target transformer;
[0134] Step 3: determining temperature parameters of several target parts of the target transformer based on the loss parameters of the target transformer;
[0135] Step 4: Determine a target winding displacement of the target transformer based on the stress parameters and the temperature parameters of each target part, so as to determine a target short-circuit strength of the target transformer based on the target winding displacement.
[0136] The specific implementation process of the above method steps can refer to the embodiments of any of the above-mentioned methods for determining the short-circuit strength of a transformer, and this embodiment will not be repeated here.
[0137] In the present application, by determining the temperature parameters of each target part based on the loss parameters, and then combining the force parameters of the target transformer, the winding displacement corresponding to each part can be accurately determined, so that the target winding displacement can be determined from each winding displacement, and then the short-circuit strength of the target transformer can be accurately determined according to the target winding displacement, which solves the problem of inaccurate determination results of the short-circuit strength of the transformer in the prior art.
[0138] Another embodiment of the present application provides an electronic device, such as Figure 3 As shown, at least a memory 1 and a processor 2 are included, the memory 1 stores a computer program, and the processor 2 implements the following method steps when executing the computer program on the memory 1:
[0139] Step 1: Determine the loss parameters of the target transformer;
[0140] Step 2: Determine the stress parameters of the target transformer;
[0141] Step 3: determining temperature parameters of several target parts of the target transformer based on the loss parameters of the target transformer;
[0142] Step 4: Determine a target winding displacement of the target transformer based on the stress parameters and the temperature parameters of each target part, so as to determine a target short-circuit strength of the target transformer based on the target winding displacement.
[0143] The specific implementation process of the above method steps can refer to the embodiments of any of the above-mentioned methods for determining the short-circuit strength of a transformer, and this embodiment will not be repeated here.
[0144] In the present application, by determining the temperature parameters of each target part based on the loss parameters and then combining the force parameters of the target transformer, the winding displacement corresponding to each part can be accurately determined, so that the target winding displacement can be determined from each winding displacement, and then the short-circuit strength of the target transformer can be accurately determined according to the target winding displacement, which solves the problem of inaccurate determination results of the short-circuit strength of the transformer in the prior art.
[0145] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.
Claims
1. A method for determining the short-circuit strength of a transformer, characterized in that: include: Determine loss parameters of the target transformer; Determine the stress parameters of the target transformer; Determining temperature parameters of several target parts of the target transformer based on the loss parameters of the target transformer; Based on the stress parameters and the temperature parameters of each target part, a target winding displacement of the target transformer is determined, so as to determine a target short-circuit strength of the target transformer based on the target winding displacement.
2. The method according to claim 1, characterized in that The loss parameters include no-load loss and load loss; The obtaining of loss parameters of the target transformer includes: Determine the hysteresis loss and the first eddy current loss of the target transformer in a no-load operation state; Determine the DC resistance loss and the second eddy current loss of the target transformer under load operation state; determining a no-load loss based at least on the hysteresis loss and the first eddy current loss; A load loss is determined based on the DC resistance loss and the second eddy current loss.
3. The method according to claim 1, characterized in that The determining of the stress parameters of the target transformer specifically includes: The radial electromagnetic force and the axial electromagnetic force of the target transformer in the short-circuit state are determined to obtain the force parameters.
4. The method according to claim 1, characterized in that The step of determining the temperature parameters of several target parts of the target transformer based on the loss parameters of the target transformer specifically includes: Dividing the target transformer into regions to obtain a number of grid units; Based on the loss parameters of the target transformer and the location information of each grid unit in the target transformer, determine the temperature of the location object corresponding to each grid unit; Based on the temperature of each of the object parts, the temperature parameters of each of the target parts of the target transformer are determined.
5. The method according to claim 4, characterized in that The part information includes position information and component parameters of a component object, and the component object includes any one or more of the following: an iron core, a spacer, a stay, a high-voltage winding, and a medium-voltage winding.
6. The method according to claim 5, characterized in that The step of determining a target winding displacement of the target transformer based on the stress parameter and the temperature parameter of each target part, so as to determine a target short-circuit strength of the target transformer based on the target winding displacement, specifically includes: Determining the initial winding displacement of each target part based on the force parameter and the temperature parameter of each target part; Based on the initial winding displacement of each target position, a target winding displacement of the target transformer is determined, so as to determine a target short-circuit strength of the target transformer based on the target winding displacement.
7. The method according to any one of claims 1 to 6, characterized in that: Determining a target short-circuit strength of the target transformer based on the target winding displacement specifically includes: Based on the target winding displacement and the preset corresponding relationship between each winding displacement and each short-circuit resistance strength, the target short-circuit resistance strength corresponding to the target winding displacement is determined.
8. A device for determining the short-circuit strength of a transformer, characterized in that: include: A first determination module, used to determine the loss parameters of the target transformer; A second determination module is used to determine the stress parameters of the target transformer; A third determination module, configured to determine temperature parameters of several target parts of the target transformer based on the loss parameters of the target transformer; A determination module is used to determine a target winding displacement of the target transformer based on the stress parameter and the temperature parameters of each target part, so as to determine a target short-circuit strength of the target transformer based on the target winding displacement.
9. A storage medium, characterized in that: The storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for determining the short-circuit strength of a transformer as described in any one of claims 1 to 7 are implemented.
10. An electronic device, characterized in that: The method comprises at least a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the method for determining the short-circuit strength of a transformer as described in any one of claims 1 to 7 when executing the computer program on the memory.