CN115863028A - Magnetic shielding device of transformer and optimization method thereof - Google Patents
Magnetic shielding device of transformer and optimization method thereof Download PDFInfo
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- CN115863028A CN115863028A CN202211355527.7A CN202211355527A CN115863028A CN 115863028 A CN115863028 A CN 115863028A CN 202211355527 A CN202211355527 A CN 202211355527A CN 115863028 A CN115863028 A CN 115863028A
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Abstract
The invention relates to a magnetic shielding device of a transformer and an optimization method thereof, wherein the magnetic shielding device is arranged close to the inner side wall of an oil tank of the transformer, and comprises the following components: the transformer comprises a plurality of tile-shaped metal sheets which are arranged in a stacked mode, wherein the tile-shaped metal sheets are located on one side of a winding of the transformer, and two ends of each tile-shaped metal sheet are turned up to form two bent shielding parts in a mode of deviating from the inner side wall of an oil tank; the tile-shaped metal sheet further comprises a flat magnetic shielding part, and the two bent shielding parts are symmetrically arranged relative to the flat magnetic shielding part; the flat magnetic shielding parts are located right below the winding, and the two bent magnetic shielding parts are located on two sides of the winding respectively. The eddy current loss of the mounting surface can be obviously reduced, the magnetic field of the rest surface of the oil tank can be optimized, and the safety performance of the transformer is improved.
Description
Technical Field
The invention relates to the technical field of transformer shielding, in particular to a magnetic shielding device of a transformer and an optimization method thereof.
Background
The capacity and volume of the power transformer are increasing with the development of the power industry, but the volume of the power transformer cannot be increased continuously according to the requirement of the electromagnetic design due to the limitation of the industrial capability at the present stage, so that a higher electromagnetic load density is required in the power transformer. In the transformer with higher electromagnetic load density and higher capacity, the proportion of the generated leakage magnetic flux is increased, so that the density of eddy current induced by the leakage magnetic field in the metal structural part of the transformer is increased, and the stray loss in the internal structural part of the transformer is increased. Studies have shown that for every 20% increase in the intensity of the leakage field, the stray losses induced by the alternating leakage field increase by 40%. The leakage magnetic field in the transformer is too large, which causes the stray loss on the metal structural member to be too large or the distribution to be excessively concentrated to form local hot spots, thus causing the abnormal operation of the power transformer.
The stray loss is mainly distributed in parts such as a transformer oil tank, a pulling plate, a limb plate, a clamping piece and the like, wherein the proportion of the oil tank is the largest, and the distribution of the stray loss is extremely unbalanced, so that the phenomenon of local overheating of some parts of the oil tank due to concentrated loss is easily caused.
Disclosure of Invention
Therefore, the invention aims to solve the technical problems that the transformer oil tank in the prior art is easy to wear, local overheating is generated, and potential safety hazards are caused.
In order to solve the above technical problem, the present invention provides a magnetic shielding device for a transformer, which is disposed to be closely attached to an inner sidewall of an oil tank of the transformer, the magnetic shielding device comprising:
the transformer comprises a plurality of tile-shaped metal sheets which are arranged in a stacked mode, wherein the tile-shaped metal sheets are located on one side of a winding of the transformer, and two ends of each tile-shaped metal sheet are turned up to form two bent shielding parts in a mode of deviating from the inner side wall of an oil tank; the tile-shaped metal sheet further comprises a flat magnetic shielding part, and the two bent shielding parts are symmetrically arranged relative to the flat magnetic shielding part;
the flat magnetic shielding parts are located right below the winding, and the two bent magnetic shielding parts are located on two sides of the winding respectively.
Preferably, the flat plate shielding part is formed by sequentially arranging a plurality of magnetic shielding strips.
Preferably, the tile-shaped metal sheet is a silicon steel material.
Preferably, the tile-shaped metal sheet is coated with an insulating paint or an insulating oxide on the surface.
Preferably, the width of the tile-shaped metal sheet is greater than the width of the winding.
Preferably, the height of the tile-shaped metal sheet is flush with the lower end of the winding.
Preferably, the magnetic shield device has two, and two magnetic shield devices are symmetrically arranged with respect to the winding.
The invention discloses an optimization method of a magnetic shielding device of a transformer, which is based on the magnetic shielding device of the transformer and comprises the following steps:
s1, obtaining a loss function and an eddy current density function of a transformer, and selecting the shielding thickness, the shielding height, the shielding width and the bending degree of a bent magnetic shielding part of a magnetic shielding device as optimization variables;
s2, establishing a variable model by using a Latin supersampling optimization variable;
s3, carrying out finite element solution on the variable model by using a surface resistance method, establishing a loss response surface model by using a Gaussian process method, and establishing a maximum eddy current density model by using various approximate displacement methods;
s4, constructing a magnetic shielding initial model according to the loss response surface model and the maximum eddy current density model;
s5, verifying the initial model of the magnetic shield, entering the next step if the initial model passes the verification, and returning to S2 if the initial model passes the verification;
and S6, solving the verified magnetic shielding initial model through a particle swarm algorithm to obtain an optimal solution of the shielding thickness, the shielding height, the shielding width and the curvature of the bent magnetic shielding part.
Preferably, the S6 includes:
s61, detecting the fitness of the particles, and updating the speed and the position of the particles;
s62, detecting the fitness of the particles, and updating the historical optimal adaptive value and position of the population;
and S63, judging whether the updated group history optimal adaptive value and the updated position meet the preset convergence condition or not according to the preset convergence condition, if not, entering S61, and if so, obtaining the optimal results of the shielding thickness, the shielding height, the shielding width and the curvature of the bent magnetic shielding part.
Compared with the prior art, the technical scheme of the invention has the following advantages:
1. the tile-shaped metal sheet rolls up the shielding layer on the edge side of the oil tank according to the transverse magnetic flux leakage distribution of the winding to enable the shielding layer to be tightly attached to the winding, and the structure has the same shadow area with the flat-plate type magnetic shielding device on the oil tank, so that the effective area inside the transformer is not influenced.
2. The use of tile type sheetmetal compares traditional strip magnetic screen, and the oil tank receives the leakage magnetic field to influence eddy current loss littleer, and magnetic flux density is lower, and eddy current density is lower.
3. The loss that traditional magnetism shield installation only influenced the oil tank face of installation magnetic shield does not influence the loss of the remaining face, compares under, uses tile type sheetmetal in combination, not only shows the eddy current loss that reduces the installation face, optimizes the magnetic field of the remaining face of oil tank moreover to reduce the eddy current loss of the remaining face.
4. The silicon steel sheet is a bottom-layer-free self-bonding oriented silicon steel material with high magnetic conductivity, and the magnesium silicate bottom layer of the traditional oriented silicon steel is removed from the surface of the silicon steel sheet, so that the problems of slag falling, wire drawing, mold damage and the like easily caused in the blanking process of the silicon steel sheet are avoided. In addition, the self-bonding can form a whole between the sheets, reduce the crack and the shearing stress, effectively reduce the loss of the magnetic shielding and simultaneously reduce the noise caused by magnetostriction when the oriented silicon steel sheets are magnetized.
5. In the invention, the transformer shielding realizes multi-target improved particle swarm optimization, the algorithm has no cross and variation operation, the search is completed by depending on the particle speed, and only the most particles transmit information to other particles in iterative evolution, so the search speed is high; meanwhile, the algorithm has memorability, and the historical best position of the particle group can be memorized and transmitted to other particles; the parameters needing to be adjusted are few, the structure is simple, and the engineering realization is easy.
Drawings
FIG. 1 is a schematic diagram of a shielding device disposed on one side of a winding according to the present invention;
FIG. 2 is a schematic view of a shielding device;
FIG. 3 is a front view of a side of the winding with a shield;
fig. 4 is a flowchart of an optimization method of the magnetic shield device.
The specification reference numbers indicate: 1. a winding; 2. a magnetic shielding device; 3. the inner wall of the oil tank; 4. a flat plate shielding part; 5. the shield portion is bent.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Referring to fig. 1-2, the present invention discloses a magnetic shield apparatus 2 of a transformer, which is disposed closely to an inner sidewall of a tank of the transformer, the magnetic shield apparatus 2 comprising: a plurality of tile-shaped metal sheets which are arranged in a stacked mode and are located on one side of a winding 1 of the transformer, and two ends of each tile-shaped metal sheet are turned up to form two bent shielding parts 5 in a mode of deviating from the inner side wall of the oil tank; the tile-shaped metal sheet further comprises a flat magnetic shielding part, and the two bent shielding parts 5 are symmetrically arranged relative to the flat magnetic shielding part; the flat magnetic shielding parts are located right below the winding 1, and the two bent magnetic shielding parts are located on two sides of the winding 1 respectively.
The working principle of the invention is as follows: the magnetic shielding principle is to place different magnetic conductivity materials in the same magnetic field, and the magnetic induction intensity can take place the sudden change on the material interface, and the magnetic shielding is close to the oil tank protective surface more, and its effect is better, consequently, hugs closely oil tank inner wall 3 with magnetic shielding device 2. Before the magnetic shielding device 2 is installed in the oil tank, magnetic leakage flux mainly forms a closed loop through the oil tank and the winding 1, and after the magnetic shielding device 2 is installed, the magnetic leakage flux generated by the transformer is attracted by the magnetic shielding device 2 due to high magnetic conductivity of the magnetic shielding device, so that the magnetic leakage flux entering the oil tank is reduced, and the transformer is protected. In the invention, a plurality of tile-shaped metal sheets are stacked, so that a higher magnetic shielding effect can be achieved, and because a single tile-shaped metal sheet is provided with two bent magnetic shielding parts, and the two bent shielding parts 5 are positioned on two sides of the winding 1, the magnetic shielding effect can be further improved, so that local overheating is prevented, the stability is good, and the safety performance is improved.
The flat plate shielding part 4 is formed by arranging a plurality of magnetic shielding strips in sequence. A plurality of shielding strips also can set up at interval, so, when not influencing magnetic screen effect, can lighten weight, save material.
In another embodiment, the tile-shaped metal sheet is a silicon steel material. The reason for using silicon steel material is that the eddy current loss is small, the magnetic shielding is made by laminating silicon steel sheets, the surfaces of the sheets are coated with insulating varnish or insulating oxide, when magnetic flux passes through the narrow cross section of the sheets, the eddy current is limited to flow along some narrow loops in each sheet, the net electromotive force in the loops is small, the length of the loops is large, and the electrical resistivity of the sheet material is large, so the eddy current loss can be obviously reduced.
The width of the tile-shaped metal sheet is greater than that of the winding 1. The height of the tile-shaped metal sheet is flush with the lower end of the winding 1. By the design in this way, the magnetic shield apparatus 2 is made more compact in structure and does not occupy a large space.
The magnetic shield devices 2 have two, and two of the magnetic shield devices 2 are symmetrically arranged with respect to the winding 1. For example, in the figure, the magnetic shield device 2 is located at the lower side of the winding 1, and similarly, one magnetic shield device 2 is symmetrically arranged at the upper side of the winding 1, so that the stability is better.
In the present invention, the magnetic flux density is concentrated on the tank cap, and the magnetic flux density is higher on the side corresponding to the winding 1 than on the other positions, so that the magnetic shield is mainly attached to the side corresponding to the tank cap.
The used silicon steel sheets are formed by arranging 22 independent magnetic shielding strips at certain intervals and are sequentially arranged on the rear wall of the oil tank.
When the thickness of the magnetic shield is 10mm, the eddy current loss and the magnetic flux density of the main oil tank are obviously reduced through calculation, so the thickness of the magnetic shield influences the shielding effect.
The invention also discloses a transformer which comprises the magnetic shielding device.
Referring to fig. 3 to 4, in order to improve the magnetic shielding effect and adapt to transformers of different styles, the invention further discloses an optimization method of a magnetic shielding device of a transformer, which is based on the magnetic shielding device of the transformer and comprises the following steps:
the method comprises the following steps of firstly, obtaining a loss function and an eddy current density function of a transformer, and selecting the shielding thickness, the shielding height, the shielding width and the bending degree of a bent magnetic shielding part of a magnetic shielding device as optimization variables;
secondly, establishing a variable model by using a Latin supersampling optimization variable;
step three, carrying out finite element solution on the variable model by using a surface resistance method, establishing a loss response surface model by using a Gaussian process method, and establishing a maximum eddy current density model by using various approximate displacement methods;
fourthly, constructing a magnetic shielding initial model according to the loss response surface model and the maximum eddy current density model;
step five, verifying the initial model of the magnetic shield, if the initial model passes the verification, entering the next step, and if not, returning to the step one;
solving the verified magnetic shield initial model through a particle swarm algorithm to obtain an optimal solution of the shielding thickness, the shielding height, the shielding width and the curvature of the bent magnetic shield part, and specifically comprises the following steps:
s61, detecting the fitness of the particles, and updating the speed and the position of the particles;
s62, detecting the fitness of the particles, and updating the historical optimal adaptive value and position of the population;
and S63, judging whether the updated group history optimal adaptive value and position meet the preset value convergence condition or not according to the preset convergence condition, if not, entering S61, and if so, obtaining the optimal results of the shielding thickness, the shielding height, the shielding width and the curvature of the bent magnetic shielding part.
The optimization method of the present invention will be further explained and explained with reference to the following embodiments.
The embodiment provides a multi-objective improved particle swarm optimization algorithm based on a surface impedance method, and optimization variables comprise: the shielding thickness, the shielding height, the shielding width and the shielding curvature, and the objective function is the oil tank surface loss and the maximum magnetic flux density of the oil tank;
the oil tank surface loss function P and the oil tank maximum magnetic flux density function B are objective functions;
performing Latin hypercube sampling on the optimized variable screen wall thickness t, the shielding height h, the shielding width l and the shielding curvature c, performing finite element solution based on a surface impedance method on sample data under different variables according to the result of the Latin hypercube sampling, and respectively establishing a loss response surface model and a maximum magnetic flux density response surface model by combining the finite element result of the solution;
respectively establishing a loss response surface model and a maximum magnetic flux density response surface model by adopting a Gaussian process method and an anisotropic Crick method, and ensuring that the response surface model is consistent with an actual transformer loss and magnetic flux density target function; the Gaussian process method has advantages in the aspects of precision and flexibility, and can better quantize data, the anisotropic kriging method considers the relative importance degree between controllable variables and the influence of different variable changes on the variation of estimated values during fitting, and the method can reduce the anisotropy of sample data although the anisotropy of the sample data cannot be eliminated;
then, the established response surface model is checked and trained, so that the response surface model result and the finite element result are in the allowable goodness-of-fit range R 2 In which, among others,
in the formula, y i For the result obtained by the finite element method,
the result output by the response surface model built for AK is evaluated>
Obtaining the average value of the results by the finite element method;
then, optimizing the established response surface model through an improved particle swarm algorithm to obtain a final shielding optimization result;
the solving process of the particle swarm optimization is a non-constrained optimization process, the value range of the transformer shielding optimization design variable is determined by constraint conditions in the optimization design, and the constraint conditions are implicit expressions of the optimization variables and have the characteristics of nonlinearity and strong coupling. Here, the function g will be constrained i (X) is introduced into the program of the particle swarm algorithm as a penalty function. The introduction of penalty function comprises an objective function min F (X) and a constraint condition g i (X) is more than or equal to 0 and fused into an augmented objective function, any trend of violating constraints is punished, the unconstrained optimization is forced to approach a feasible region, and finally the constrained optimization problem of the transformer design is adjusted to be the unconstrained optimization design problem of the augmented objective function;
the augmented objective function is:
x is an optimization variable X 1～4 = (shield thickness t, shield height h, shield curvature c, shield width I), g i (X) is a constraint function, g 1 (X) = tank level loss, g 2 (X) is the maximum magnetic field density of the oil tank, m is the number of constraint functions, C i Is a restricted range, wherein C 1 ＝5kW，C 2 ＝1T；
The particle swarm algorithm is applied to the processed optimization design problem, and the flow chart is shown in fig. 4. The concrete implementation steps are as follows:
(1) And selecting the value range of the optimized design variable according to the technical parameters given by the transformer, and determining the search area and the flight speed of the particles.
(2) And initializing the particles within the value range of the optimized variable, so that each particle can become a feasible design scheme of the transformer shield.
(3) And applying the particle swarm algorithm to the optimally designed mathematical model, and executing the updating iterative operation of the algorithm.
(4) And (5) ending iteration, finding the position of the optimal particle, and obtaining the value of each dimension of the particle, namely the optimal solution of all the optimal design variables.
(5) And calculating the optimal solution of all the optimized variables through a design program of the transformer to obtain an optimal design scheme and outputting the optimal design scheme.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (9)
1. A magnetic shield device of a transformer, characterized in that it is disposed closely to an inner side wall of an oil tank of the transformer, the magnetic shield device comprising:
the transformer comprises a plurality of tile-shaped metal sheets which are arranged in a stacked mode, wherein the tile-shaped metal sheets are located on one side of a winding of the transformer, and two ends of each tile-shaped metal sheet are turned up to form two bent shielding parts in a mode of deviating from the inner side wall of an oil tank; the tile-shaped metal sheet further comprises a flat magnetic shielding part, and the two bent shielding parts are symmetrically arranged relative to the flat magnetic shielding part;
the flat magnetic shielding parts are located right below the winding, and the two bent magnetic shielding parts are located on two sides of the winding respectively.
2. The magnetic shield device of a transformer according to claim 1, wherein said flat plate shield portion is composed of a plurality of magnetic shield strips arranged in sequence.
3. Magnetic shielding device for transformers according to claim 1, characterized in that said sheet metal tiles are of silicon steel material.
4. Magnetic shielding device for a transformer according to claim 1, characterized in that the tile-shaped metal sheet is surface-coated with an insulating varnish or an insulating oxide.
5. Magnetic shielding device of a transformer according to claim 1, characterized in that the width of the sheet metal tiles is larger than the width of the windings.
6. Magnetic shielding device for transformers according to claim 1, characterized in that the height of said tile-shaped metal sheets is flush with the lower end of the winding.
7. Magnetic shielding of a transformer according to claim 1, characterized in that said magnetic shielding has two, said two magnetic shielding being symmetrically arranged with respect to the winding.
8. A method for optimizing a magnetic shielding device of a transformer, based on the magnetic shielding device of a transformer according to any one of claims 1 to 7, comprising the steps of:
s1, obtaining a loss function and an eddy current density function of a transformer, and selecting the shielding thickness, the shielding height, the shielding width and the bending degree of a bent magnetic shielding part of a magnetic shielding device as optimization variables;
s2, establishing a variable model by using a Latin supersampling optimization variable;
s3, carrying out finite element solution on the variable model by using a surface resistance method, establishing a loss response surface model by using a Gaussian process method, and establishing a maximum eddy current density model by using various approximate displacement methods;
s4, constructing a magnetic shielding initial model according to the loss response surface model and the maximum eddy current density model;
s5, verifying the initial model of the magnetic shield, entering the next step if the initial model passes the verification, and returning to S2 if the initial model passes the verification;
and S6, solving the verified magnetic shielding initial model through a particle swarm algorithm to obtain an optimal solution of the shielding thickness, the shielding height, the shielding width and the curvature of the bent magnetic shielding part.
9. Method for optimization of magnetic shielding of a transformer according to claim 8, characterized in that said S6 comprises:
s61, detecting the fitness of the particles, and updating the speed and the position of the particles;
s62, detecting the fitness of the particles, and updating the historical optimal adaptive value and position of the population;
and S63, judging whether the updated group history optimal adaptive value and the updated position meet the preset convergence condition or not according to the preset convergence condition, if not, entering S61, and if so, obtaining the optimal results of the shielding thickness, the shielding height, the shielding width and the curvature of the bent magnetic shielding part.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116718862A (en) * | 2023-08-07 | 2023-09-08 | 杭州得明电子有限公司 | Shielding effect detection method for flyback transformer shielding layer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116718862A (en) * | 2023-08-07 | 2023-09-08 | 杭州得明电子有限公司 | Shielding effect detection method for flyback transformer shielding layer |
| CN116718862B (en) * | 2023-08-07 | 2023-10-27 | 杭州得明电子有限公司 | Shielding effect detection method for flyback transformer shielding layer |
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