A method for calculating equivalent conductivity of transformer core and related equipment

Abstract

The embodiment of the present invention discloses a method for calculating the equivalent conductivity of a transformer core and related equipment, the method comprising: obtaining basic data of the target transformer, the basic data comprising structural data of the core, coil and box of the transformer, and the number of coil turns, coil material parameters, oil material parameters and rated voltage of the transformer; constructing a three-dimensional magnetic field calculation model of the target transformer according to the basic data of the target transformer, the three-dimensional magnetic field calculation model being a finite element calculation model; substituting a preset transformer core equivalent conductivity into the three-dimensional magnetic field calculation model to obtain an initial core magnetic flux density value; if the initial core magnetic flux density value meets a preset condition, using the preset transformer core equivalent conductivity as the core equivalent conductivity of the target transformer; if the initial core magnetic flux density value does not meet the preset condition, adjusting the preset transformer core equivalent conductivity until the initial core magnetic flux density value meets the preset condition.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission and transformation, and in particular to a method for calculating equivalent conductivity of a transformer core and related equipment. Background Art

[0002] The simulation calculation of the transformer temperature field under different working conditions has important physical significance for the daily operation and maintenance of the transformer, especially the calculation of the transformer temperature field under overload has important engineering value for the life prediction and insulation analysis of the transformer. However, since the calculation of the temperature field requires the conductivity of the transformer core, only the iron loss curve of the transformer core is available during the transformer design process, which is not conducive to the calculation of the transformer temperature field under different working conditions, and thus makes the life prediction and insulation analysis of the transformer inaccurate. Summary of the invention

[0003] In view of this, the present invention provides a method for calculating the equivalent conductivity of a transformer core and related equipment, which is used to solve the problem that in the prior art, only the iron loss curve of the transformer core is available during the transformer design process, but the conductivity of the transformer core cannot be obtained, and solve the problem of rapid convergence of the temperature field calculation under natural convection of the disconnector. In order to achieve one or part or all of the above purposes or other purposes, the present invention proposes a method for calculating the equivalent conductivity of a transformer core, the method comprising:

[0004] Acquire basic data of the target transformer, wherein the basic data includes structural data of the iron core, coil and box of the transformer, as well as the number of coil turns, coil material parameters, oil material parameters and rated voltage of the transformer;

[0005] Constructing a three-dimensional magnetic field calculation model of the target transformer according to the basic data of the target transformer, wherein the three-dimensional magnetic field calculation model is a finite element calculation model;

[0006] The preset transformer core equivalent conductivity is combined with the three-dimensional magnetic field calculation model to obtain an initial core magnetic flux density value;

[0007] Matching the initial core magnetic density value with the preset core magnetic density value, determining whether the initial core magnetic density value meets the preset condition, and if the initial core magnetic density value meets the preset condition, using the preset transformer core equivalent conductivity as the core equivalent conductivity of the target transformer;

[0008] If the initial core magnetic flux density value does not meet the preset condition, the preset transformer core equivalent conductivity is adjusted until the initial core magnetic flux density value meets the preset condition.

[0009] Optionally, the step of matching the initial core magnetic density value with a preset core magnetic density value and determining whether the initial core magnetic density value meets a preset condition includes:

[0010] Calculating the uncertainty of the initial core magnetic flux density value and the preset core magnetic flux density value;

[0011] If the uncertainty is less than or equal to the target threshold, it is judged that the initial core magnetic flux density value meets the preset condition;

[0012] If the uncertainty is greater than the target threshold, it is determined that the initial core magnetic flux density value does not meet the preset condition.

[0013] Optionally, the step of constructing a three-dimensional magnetic field calculation model of the target transformer according to the basic data of the target transformer includes:

[0014] Establishing a multi-physics field simulation coupling calculation model according to the geometric structure, material parameters and rated current of the disconnector in the target transformer;

[0015] A three-dimensional magnetic field calculation model of the target transformer is constructed based on the multi-physical field simulation coupling calculation model and the basic data of the target transformer.

[0016] Optionally, the basic data of the target transformer constructs a three-dimensional magnetic field calculation model of the target transformer, including a box calculation model of the target transformer, a core calculation model of the target transformer, a low-voltage coil calculation model of the target transformer, and a high-voltage coil calculation model of the target transformer.

[0017] Optionally, the step of matching the initial core magnetic flux density value with a preset core magnetic flux density value includes:

[0018] The average value of the core magnetic density of the coil-covered part obtained based on the three-dimensional magnetic field calculation model of the target transformer is matched with the magnetic density distribution value of the preset core magnetic density, and the initial core magnetic density value is the average value of the core magnetic density of the coil-covered part.

[0019] Optionally, the step of obtaining the average value of the core magnetic flux density of the coil-covered part based on the three-dimensional magnetic field calculation model of the target transformer includes:

[0020] The average value of the core magnetic flux density of the coil-covered part is obtained based on the three-dimensional magnetic field calculation model of the target transformer using the electromagnetic field equation group of the magnetic quasi-static field.

[0021] Optionally, the step of obtaining the average value of the core magnetic flux density of the coil-covered part based on the three-dimensional magnetic field calculation model of the target transformer includes:

[0022] Calculate the average magnetic flux density B of the core covered by the coil (平均值) :

[0023]

[0024] Where σ is the initial core magnetic flux density.

[0025] On the other hand, the present application provides a transformer core equivalent conductivity calculation device, comprising:

[0026] A data acquisition module, used to obtain basic data of the target transformer, wherein the basic data includes structural data of the iron core, coil and box of the transformer, as well as the number of coil turns, coil material parameters, oil material parameters and rated voltage of the transformer;

[0027] A construction module, used to construct a three-dimensional magnetic field calculation model of the target transformer according to the basic data of the target transformer, wherein the three-dimensional magnetic field calculation model is a finite element calculation model;

[0028] A calculation module, used to combine a preset transformer core equivalent conductivity with the three-dimensional magnetic field calculation model to obtain an initial core magnetic flux density value;

[0029] A matching module, used to match the initial core magnetic density value with a preset core magnetic density value, and determine whether the initial core magnetic density value meets a preset condition;

[0030] A value-taking module is used to, if the initial core magnetic density value meets the preset conditions, use the preset transformer core equivalent conductivity as the core equivalent conductivity of the target transformer; if the initial core magnetic density value does not meet the preset conditions, adjust the preset transformer core equivalent conductivity until the initial core magnetic density value meets the preset conditions.

[0031] In a third aspect, an embodiment of the present application provides an electronic device, comprising: a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate through the bus, and when the machine-readable instructions are executed by the processor, the steps of the method for calculating the equivalent conductivity of the transformer core are performed as described above.

[0032] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the transformer core equivalent conductivity calculation method as described above are executed.

[0033] Implementing the embodiments of the present invention will have the following beneficial effects:

[0034] By acquiring basic data of the target transformer, the basic data includes structural data of the iron core, coil and box of the transformer, as well as the number of coil turns, coil material parameters, oil material parameters and rated voltage of the transformer; constructing a three-dimensional magnetic field calculation model of the target transformer according to the basic data of the target transformer, the three-dimensional magnetic field calculation model is a finite element calculation model; combining a preset transformer iron core equivalent conductivity with the three-dimensional magnetic field calculation model to obtain an initial iron core magnetic density value; matching the initial iron core magnetic density value with the preset iron core magnetic density value to determine whether the initial iron core magnetic density value meets the preset conditions; if the initial iron core magnetic density value meets the preset conditions, the preset transformer iron core equivalent conductivity is used as the iron core equivalent conductivity of the target transformer; if the initial iron core magnetic density value does not meet the preset conditions, adjusting the preset transformer iron core equivalent conductivity until the initial iron core magnetic density value meets the preset conditions. The equivalent conductivity of the iron core of the target transformer is quickly determined, which solves the problem that in the prior art, only the iron loss curve of the transformer core is available during the transformer design process, but the conductivity of the transformer core cannot be obtained, thereby solving the problem of rapid convergence of the temperature field calculation under natural convection of the disconnector. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] in:

[0037] Figure 1 It is a flow chart of a method for calculating equivalent conductivity of a transformer core provided in an embodiment of the present application;

[0038] Figure 2 It is a box calculation model diagram of a target transformer described in a method for calculating equivalent conductivity of a transformer core provided in an embodiment of the present application;

[0039] Figure 3 It is a calculation model diagram of the iron core of the target transformer in a method for calculating equivalent conductivity of the iron core of a transformer provided in an embodiment of the present application;

[0040] Figure 4 It is a calculation model of the low-voltage coil of the target transformer in a method for calculating equivalent conductivity of a transformer core provided in an embodiment of the present application;

[0041] Figure 5 It is a high-voltage coil calculation model of a target transformer in a transformer core equivalent conductivity calculation method provided in an embodiment of the present application;

[0042] Figure 6 It is a structural schematic diagram of a transformer core equivalent conductivity calculation device provided in an embodiment of the present application;

[0043] Figure 7 It is a structural schematic diagram of an electronic device provided in an embodiment of the present application;

[0044] Figure 8 It is a structural schematic diagram of a storage medium provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] like Figure 1 As shown, an embodiment of the present application provides a method for calculating the equivalent conductivity of a transformer core, the method comprising:

[0047] S101, acquiring basic data of the target transformer, wherein the basic data includes structural data of the iron core, coil and box of the transformer, and the number of coil turns, coil material parameters, oil material parameters and rated voltage of the transformer;

[0048] S102, constructing a three-dimensional magnetic field calculation model of the target transformer according to basic data of the target transformer, wherein the three-dimensional magnetic field calculation model is a finite element calculation model;

[0049] Exemplarily, a three-dimensional finite element electromagnetic field simulation model of the transformer is established according to the actual structure of the transformer. Three-dimensional modeling software, such as Inventor and other software, can be used to establish the three-dimensional finite element electromagnetic field simulation model of the transformer according to the actual structural dimensions of the original parts such as the transformer's windings, cores, clamps, pull plates and oil tanks, that is, basic data.

[0050] S103, combining the preset transformer core equivalent conductivity with the three-dimensional magnetic field calculation model to obtain an initial core magnetic flux density value;

[0051] Exemplarily, based on the three-dimensional finite element magnetic field model, the transient current value and dynamic inductance value of the transformer winding are obtained through circuit calculation; based on the three-dimensional finite element magnetic field model, the excitation current value and magnetic flux density distribution of the transformer core, that is, the initial core magnetic density value, are obtained through magnetic field calculation.

[0052] S104, matching the initial core magnetic density value with a preset core magnetic density value, and determining whether the initial core magnetic density value meets a preset condition;

[0053] S105. If the initial core magnetic density value meets the preset conditions, the preset transformer core equivalent conductivity is used as the core equivalent conductivity of the target transformer; if the initial core magnetic density value does not meet the preset conditions, the preset transformer core equivalent conductivity is adjusted until the initial core magnetic density value meets the preset conditions.

[0054] In a possible implementation manner, the step of matching the initial core magnetic flux density value with a preset core magnetic flux density value and determining whether the initial core magnetic flux density value meets a preset condition includes:

[0055] Calculating the uncertainty of the initial core magnetic flux density value and the preset core magnetic flux density value;

[0056] If the uncertainty is less than or equal to the target threshold, it is judged that the initial core magnetic flux density value meets the preset condition;

[0057] If the uncertainty is greater than the target threshold, it is determined that the initial core magnetic flux density value does not meet the preset condition.

[0058] For example, by changing the parameter value, the transformer three-dimensional magnetic field finite element calculation obtains the average magnetic flux density B of the core covered by the coil (平均值) Approximately equal to the designed core magnetic flux value B (预设值) (uncertainty is less than or equal to 0.02%), the parameter σ0 at this time is the equivalent conductivity σ0 of the transformer core.

[0059] By acquiring basic data of the target transformer, the basic data includes structural data of the iron core, coil and box of the transformer, as well as the number of coil turns, coil material parameters, oil material parameters and rated voltage of the transformer; constructing a three-dimensional magnetic field calculation model of the target transformer according to the basic data of the target transformer, the three-dimensional magnetic field calculation model is a finite element calculation model; combining a preset transformer iron core equivalent conductivity with the three-dimensional magnetic field calculation model to obtain an initial iron core magnetic density value; matching the initial iron core magnetic density value with the preset iron core magnetic density value to determine whether the initial iron core magnetic density value meets the preset conditions; if the initial iron core magnetic density value meets the preset conditions, the preset transformer iron core equivalent conductivity is used as the iron core equivalent conductivity of the target transformer; if the initial iron core magnetic density value does not meet the preset conditions, adjusting the preset transformer iron core equivalent conductivity until the initial iron core magnetic density value meets the preset conditions. The equivalent conductivity of the iron core of the target transformer is quickly determined, which solves the problem that in the prior art, only the iron loss curve of the transformer core is available during the transformer design process, but the conductivity of the transformer core cannot be obtained, thereby solving the problem of rapid convergence of the temperature field calculation under natural convection of the disconnector.

[0060] In a possible implementation manner, the step of constructing a three-dimensional magnetic field calculation model of the target transformer according to the basic data of the target transformer includes:

[0061] Establishing a multi-physics field simulation coupling calculation model according to the geometric structure, material parameters and rated current of the disconnector in the target transformer;

[0062] A three-dimensional magnetic field calculation model of the target transformer is constructed based on the multi-physical field simulation coupling calculation model and the basic data of the target transformer.

[0063] In a possible implementation, Figure 2-Figure 5 As shown, the basic data of the target transformer constructs the three-dimensional magnetic field calculation model of the target transformer, including the box calculation model of the target transformer, the core calculation model of the target transformer, the low-voltage coil calculation model of the target transformer and the high-voltage coil calculation model of the target transformer.

[0064] For example,

[0065] In a possible implementation manner, the step of matching the initial core magnetic flux density value with a preset core magnetic flux density value includes:

[0066] The average value of the core magnetic density of the coil-covered part obtained based on the three-dimensional magnetic field calculation model of the target transformer is matched with the magnetic density distribution value of the preset core magnetic density, and the initial core magnetic density value is the average value of the core magnetic density of the coil-covered part.

[0067] Exemplarily, the three-dimensional magnetic field finite element calculation of the transformer obtains a magnetic density distribution in which the average magnetic density of the core covered by the coil is equal to the designed magnetic density value of the core, and the magnetic density distribution of the designed magnetic density value of the core is the magnetic density distribution value of the preset core magnetic density.

[0068] In a possible implementation manner, the step of obtaining the average value of the core magnetic flux density of the coil-covered portion based on the three-dimensional magnetic field calculation model of the target transformer includes:

[0069] The average value of the core magnetic flux density of the coil-covered part is obtained based on the three-dimensional magnetic field calculation model of the target transformer using the electromagnetic field equation group of the magnetic quasi-static field.

[0070] Exemplarily, the electromagnetic field equations of the magnetic quasistatic field are:

[0071]

[0072]

[0073] in, Magnetic vector potential, Magnetic field strength, The current density is 50 Hz and the Lorentz standard condition is adopted. The voltage or current frequency in the coil is 50 Hz.

[0074] In a possible implementation manner, the step of obtaining the average value of the core magnetic density of the coil-covered portion based on the three-dimensional magnetic field calculation model of the target transformer includes:

[0075] Calculate the average magnetic flux density B of the core covered by the coil (平均值) :

[0076]

[0077] Where σ is the initial core magnetic flux density.

[0078] In a possible implementation, the present application provides a transformer core equivalent conductivity calculation device, such as Figure 6 As shown, including:

[0079] The data acquisition module 201 is used to obtain basic data of the target transformer, wherein the basic data includes structural data of the iron core, coil and box of the transformer, as well as the number of coil turns, coil material parameters, oil material parameters and rated voltage of the transformer;

[0080] A construction module 202 is used to construct a three-dimensional magnetic field calculation model of the target transformer according to the basic data of the target transformer, and the three-dimensional magnetic field calculation model is a finite element calculation model;

[0081] A calculation module 203 is used to combine the preset transformer core equivalent conductivity with the three-dimensional magnetic field calculation model to obtain an initial core magnetic flux density value;

[0082] A matching module 204 is used to match the initial core magnetic density value with a preset core magnetic density value, and determine whether the initial core magnetic density value meets a preset condition;

[0083] The value taking module 205 is used to, if the initial core magnetic density value meets the preset conditions, use the preset transformer core equivalent conductivity as the core equivalent conductivity of the target transformer; if the initial core magnetic density value does not meet the preset conditions, adjust the preset transformer core equivalent conductivity until the initial core magnetic density value meets the preset conditions.

[0084] In a possible implementation, Figure 7 As shown, an embodiment of the present application provides an electronic device 300, including: a memory 310, a processor 320, and a computer program 311 stored in the memory 310 and executable on the processor 320. When the processor 320 executes the computer program 311, it implements: obtaining basic data of the target transformer, the basic data including structural data of the iron core, coil, and box of the transformer, and the number of coil turns, coil material parameters, oil material parameters, and rated voltage of the transformer; constructing a three-dimensional magnetic field calculation model of the target transformer according to the basic data of the target transformer, The three-dimensional magnetic field calculation model is a finite element calculation model; the preset transformer core equivalent conductivity is combined with the three-dimensional magnetic field calculation model to obtain an initial core magnetic density value; the initial core magnetic density value is matched with the preset core magnetic density value to determine whether the initial core magnetic density value meets the preset conditions. If the initial core magnetic density value meets the preset conditions, the preset transformer core equivalent conductivity is used as the core equivalent conductivity of the target transformer; if the initial core magnetic density value does not meet the preset conditions, the preset transformer core equivalent conductivity is adjusted until the initial core magnetic density value meets the preset conditions.

[0085] In a possible implementation, Figure 8As shown, an embodiment of the present application provides a computer-readable storage medium 400, on which a computer program 411 is stored, and when the computer program 411 is executed by a processor, the following steps are implemented: obtaining basic data of the target transformer, the basic data including structural data of the iron core, coil and box of the transformer, and the number of coil turns, coil material parameters, oil material parameters and rated voltage of the transformer; constructing a three-dimensional magnetic field calculation model of the target transformer according to the basic data of the target transformer, and the three-dimensional magnetic field calculation model is a finite element calculation model; combining a preset transformer iron core equivalent conductivity with the three-dimensional magnetic field calculation model to obtain an initial iron core magnetic density value; matching the initial iron core magnetic density value with a preset iron core magnetic density value, and determining whether the initial iron core magnetic density value meets a preset condition, if the initial iron core magnetic density value meets the preset condition, using the preset transformer iron core equivalent conductivity as the iron core equivalent conductivity of the target transformer; if the initial iron core magnetic density value does not meet the preset condition, adjusting the preset transformer iron core equivalent conductivity until the initial iron core magnetic density value meets the preset condition.

[0086] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, which carry computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0087] The program code embodied on the computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0088] Computer program code for performing the operations of the present invention may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0089] It should be understood by those skilled in the art that the modules or steps of the present invention described above can be implemented by a general-purpose computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, optionally, they can be implemented by a program code executable by a computer device, so that they can be stored in a storage device and executed by the computing device, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0090] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described above, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

[0091] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A method for calculating the equivalent conductivity of a transformer core, characterized in that: include: Obtaining basic data of a target transformer, the basic data including structural data of an iron core, a coil and a housing of the transformer, and the number of coil turns, coil material parameters, oil material parameters and rated voltage of the transformer; Constructing a three-dimensional magnetic field calculation model of the target transformer according to the basic data of the target transformer, wherein the three-dimensional magnetic field calculation model is a finite element calculation model; The preset transformer core equivalent conductivity is combined with the three-dimensional magnetic field calculation model to obtain an initial core magnetic flux density value; Matching the initial core magnetic density value with the preset core magnetic density value, determining whether the initial core magnetic density value meets the preset condition, and if the initial core magnetic density value meets the preset condition, using the preset transformer core equivalent conductivity as the core equivalent conductivity of the target transformer; If the initial core magnetic flux density value does not meet the preset conditions, adjusting the preset transformer core equivalent conductivity until the initial core magnetic flux density value meets the preset conditions; The step of matching the initial core magnetic flux density value with the preset core magnetic flux density value comprises: The average value of the core magnetic density of the coil-covered part obtained based on the three-dimensional magnetic field calculation model of the target transformer is matched with the magnetic density distribution value of the preset core magnetic density, and the initial core magnetic density value is the average value of the core magnetic density of the coil-covered part.

2. A method for calculating equivalent conductivity of a transformer core according to claim 1, characterized in that: The step of matching the initial core magnetic flux density value with a preset core magnetic flux density value and determining whether the initial core magnetic flux density value meets a preset condition comprises: Calculating the uncertainty of the initial core magnetic flux density value and the preset core magnetic flux density value; If the uncertainty is less than or equal to the target threshold, it is judged that the initial core magnetic flux density value meets the preset condition; If the uncertainty is greater than the target threshold, it is determined that the initial core magnetic flux density value does not meet the preset condition.

3. A method for calculating equivalent conductivity of a transformer core according to claim 1, characterized in that: The step of constructing a three-dimensional magnetic field calculation model of the target transformer according to the basic data of the target transformer comprises: Establishing a multi-physics field simulation coupling calculation model according to the geometric structure, material parameters and rated current of the disconnector in the target transformer; A three-dimensional magnetic field calculation model of the target transformer is constructed based on the multi-physical field simulation coupling calculation model and the basic data of the target transformer.

4. A method for calculating equivalent conductivity of a transformer core according to claim 1, characterized in that: The basic data of the target transformer constructs the three-dimensional magnetic field calculation model of the target transformer, including the box calculation model of the target transformer, the core calculation model of the target transformer, the low-voltage coil calculation model of the target transformer and the high-voltage coil calculation model of the target transformer.

5. A method for calculating equivalent conductivity of a transformer core according to claim 1, characterized in that: The step of obtaining the average value of the core magnetic flux density of the coil-covered part based on the three-dimensional magnetic field calculation model of the target transformer comprises: The average value of the core magnetic flux density of the coil-covered part is obtained based on the three-dimensional magnetic field calculation model of the target transformer using the electromagnetic field equation group of the magnetic quasi-static field.

6. A method for calculating equivalent conductivity of a transformer core according to claim 1, characterized in that: The step of obtaining the average value of the core magnetic flux density of the coil-covered part based on the three-dimensional magnetic field calculation model of the target transformer comprises: Calculate the average magnetic flux density of the core covered by the coil : in, is the initial core magnetic flux density value.

7. A transformer core equivalent conductivity calculation device, characterized in that: include: A data acquisition module is used to obtain basic data of the target transformer, wherein the basic data includes structural data of the iron core, coil and box of the transformer, as well as the number of coil turns, coil material parameters, oil material parameters and rated voltage of the transformer; A construction module, used to construct a three-dimensional magnetic field calculation model of the target transformer according to the basic data of the target transformer, wherein the three-dimensional magnetic field calculation model is a finite element calculation model; A calculation module, used to combine a preset transformer core equivalent conductivity with the three-dimensional magnetic field calculation model to obtain an initial core magnetic flux density value; A matching module, used to match the initial core magnetic density value with a preset core magnetic density value, and determine whether the initial core magnetic density value meets a preset condition; A value taking module, for taking a preset transformer core equivalent conductivity as the core equivalent conductivity of the target transformer if the initial core magnetic density value meets the preset conditions; and for adjusting the preset transformer core equivalent conductivity until the initial core magnetic density value meets the preset conditions if the initial core magnetic density value does not meet the preset conditions; The matching module is also used to match the average core magnetic density of the coil-covered part obtained based on the three-dimensional magnetic field calculation model of the target transformer with the magnetic density distribution value of the preset core magnetic density, and the initial core magnetic density value is the average core magnetic density of the coil-covered part.

8. An electronic device, characterized in that: include: A processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate through the bus, and when the machine-readable instructions are executed by the processor, the steps of the method for calculating the equivalent conductivity of the transformer core according to any one of claims 1 to 6 are performed.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for calculating the equivalent conductivity of the transformer core according to any one of claims 1 to 6 are executed.

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