CN112989599B - Winding structure improvement method for improving short circuit resistance of transformer - Google Patents
Winding structure improvement method for improving short circuit resistance of transformer Download PDFInfo
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- CN112989599B CN112989599B CN202110263387.XA CN202110263387A CN112989599B CN 112989599 B CN112989599 B CN 112989599B CN 202110263387 A CN202110263387 A CN 202110263387A CN 112989599 B CN112989599 B CN 112989599B
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- H—ELECTRICITY
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
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Abstract
The application provides a winding structure improvement method for improving the short circuit resistance of a transformer, which comprises the following steps: parameters of a transformer model are obtained, and a mathematical model of a three-dimensional field coupling electromagnetic field of the transformer is established; calculating the electromagnetic field of the electromagnetic field mathematical model to obtain an electromagnetic field result; taking the electromagnetic field result as a load, and calculating the stress and strain of the electromagnetic field mathematical model at the moment of short-circuit impact; analyzing the position of deformation of the electromagnetic field mathematical model at the time of short circuit; and replacing the deformed position with a heat-resistant self-adhesive transposed conductor. The winding structure improvement method for improving the short circuit resistance of the transformer can be applied to transformer windings in different forms, and has important significance in improving the short circuit resistance of the transformer and improving the stability of a power system.
Description
Technical Field
The application relates to the technical field of electric power, in particular to a winding structure improvement method for improving short circuit resistance of a transformer.
Background
With the background of the gradual perfection of the power system, the technical development of the electrical equipment is gradually approaching to maturity. Transformers are important electrical devices in electrical power systems, and stable operation of transformers is critical in order to ensure safe and stable operation of the electrical power system.
Short-circuit faults of transformers are easy to occur in electrical accidents, so that improving the short-circuit resistance of transformers is always a hot spot field of research of expert students in the transformer industry. At present, the strength of a winding is enhanced in the simplest and effective mode, and the aim of enhancing the strength of the winding is achieved by using a self-adhesive transposed conductor, wherein the self-adhesive transposed conductor is a novel conductor, and enameled flat wires are mutually adhered to form a coil with rigidity, so that the coil can bear larger bending stress. But its stiffness and degree of adhesion are inversely related to temperature.
Disclosure of Invention
The application provides an improved winding structure method for improving the short circuit resistance of a transformer, which aims to solve the problem of low strength of a transformer winding under short circuit impact.
The application provides a winding structure improvement method for improving the short circuit resistance of a transformer, which comprises the following steps:
s1: parameters of a transformer model are obtained, and a mathematical model of a three-dimensional field coupling electromagnetic field of the transformer is established;
s2: calculating the electromagnetic field of the electromagnetic field mathematical model to obtain an electromagnetic field result;
s3: taking the electromagnetic field result as a load, and calculating the stress and strain of the winding at the moment of short circuit impact;
s4: analyzing the position of the winding which generates deformation at the moment of short circuit;
s5: and replacing the original wire with a heat-resistant self-adhesive transposed wire at the deformed position. Optionally, S1 comprises the step of establishing a transformation simplified three-dimensional model through Solidworks, and introducing the model into a Maxwell electromagnetic field.
Optionally, the electromagnetic field for which the electromagnetic field mathematical model is calculated in S2 includes boundary condition settings, meshing, excitation adding, and solver settings.
Optionally, both ends of the self-adhesive transposed conductor are connected by butt welding.
According to the technical scheme, the application provides a winding structure improvement method for improving the short circuit resistance of a transformer, which comprises the following steps: parameters of a transformer model are obtained, and a mathematical model of a three-dimensional field coupling electromagnetic field of the transformer is established; calculating the electromagnetic field of the electromagnetic field mathematical model to obtain an electromagnetic field result; taking the electromagnetic field result as a load, and calculating the stress and strain of the electromagnetic field mathematical model at the moment of short-circuit impact; analyzing the position of deformation of the electromagnetic field mathematical model at the time of short circuit; and replacing the deformed position with a heat-resistant self-adhesive transposed conductor. The winding structure improvement method for improving the short circuit resistance of the transformer can be applied to transformer windings in different forms, and has important significance in improving the short circuit resistance of the transformer and improving the stability of a power system.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a flow chart of a winding structure improvement method for improving the short circuit resistance of a transformer;
FIG. 2 is a schematic diagram of a three-phase short circuit simulation model of the simulink transformer of the present application;
FIG. 3 is a waveform of a short-circuit current of a low-voltage winding of the transformer of the present application;
FIG. 4 is a cloud chart of electromagnetic force distribution of the present application;
FIG. 5 is a deformation profile of the high voltage winding under a short circuit impact of the present application;
fig. 6 is a stress distribution of the high voltage winding under the short circuit impact of the present application.
Detailed Description
Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the examples below do not represent all embodiments consistent with the present application. Merely as examples of systems and methods consistent with some aspects of the present application as detailed in the claims.
Referring to fig. 1, a flowchart of a winding structure improvement method for improving the short-circuit resistance of a transformer is provided. The winding structure improvement method for improving the short circuit resistance of the transformer comprises the following steps:
s1: parameters of a transformer model are obtained, and a mathematical model of a three-dimensional field coupling electromagnetic field of the transformer is established;
s2: calculating the electromagnetic field of the electromagnetic field mathematical model to obtain an electromagnetic field result;
s3: taking the electromagnetic field result as a load, and calculating the stress and strain of the winding at the moment of short circuit impact;
s4: analyzing the position of the winding which generates deformation at the moment of short circuit;
s5: and replacing the original wire with a heat-resistant self-adhesive transposed wire at the deformed position.
Specifically, a transformer field path coupling electromagnetic field analysis model is built. Parameters of a transformer model are obtained, a distribution-transformation-simplified three-dimensional model is built through solidworks, and the model is introduced into a Maxwell electromagnetic field. Further, referring to fig. 2, a short-circuit fault simulation model with a transformer as a core is built on a simulink platform, a transformer short-circuit current waveform is obtained through simulation calculation, and is shown in fig. 3, and then a field-path sequential coupling mode is adopted to take the short-circuit current as an excitation source for solving an electromagnetic field.
Further, electromagnetic field calculation is performed on the transformer model. And carrying out electromagnetic field calculation on the transformer based on a Maxwell finite element calculation platform, wherein the electromagnetic field calculation comprises boundary condition setting, grid division, excitation adding, solver setting and the like, and the short-circuit electromagnetic force distribution is calculated and obtained as shown in figure 4. And the short-circuit electromagnetic force is used as a load to be led into a structural field, and the stress deformation of the transformer winding at the short-circuit impact moment is solved as shown in fig. 5 and 6.
Further, the positions of the windings which deform at the moment of the short circuit are analyzed, including the positions which deform most easily. According to fig. 5 and 6, the maximum deformation position and the maximum stress position of the winding under short-circuit impact can be obtained, and the weak point under short-circuit impact is analyzed by comparing the yield strength of the lead under national standards. Finally, a high-strength self-adhesive transposed conductor is adopted to replace the original common winding which is easy to generate plastic deformation.
Further, the influences of various factors are comprehensively considered, for example, the difference of temperatures of the upper part and the lower part of the oil tank is considered, the upper part and the lower part of the winding are respectively provided with heat-resistant and common self-adhesive transposed conductors, so that the strength is ensured, and meanwhile, the cost is reduced. Considering that the joint of the transposed conductor and the common conductor has lower structural rigidity, a butt welding mode is needed.
The application provides a winding structure improvement method for improving the short circuit resistance of a transformer, which comprises the following steps: parameters of a transformer model are obtained, and a mathematical model of a three-dimensional field coupling electromagnetic field of the transformer is established; calculating the electromagnetic field of the electromagnetic field mathematical model to obtain an electromagnetic field result; taking the electromagnetic field result as a load, and calculating the stress and strain of the electromagnetic field mathematical model at the moment of short-circuit impact; analyzing the position of deformation of the electromagnetic field mathematical model at the time of short circuit; and replacing the deformed position with a heat-resistant self-adhesive transposed conductor. The winding structure improvement method for improving the short circuit resistance of the transformer can be applied to transformer windings in different forms, and has important significance in improving the short circuit resistance of the transformer and improving the stability of a power system.
The foregoing detailed description of the embodiments is merely illustrative of the general principles of the present application and should not be taken in any way as limiting the scope of the invention. Any other embodiments developed in accordance with the present application without inventive effort are within the scope of the present application for those skilled in the art.
Claims (2)
1. The winding structure improvement method for improving the short circuit resistance of the transformer is characterized by comprising the following steps of:
s1: parameters of a transformer model are obtained, and a mathematical model of a three-dimensional field coupling electromagnetic field of the transformer is established;
s2: calculating the electromagnetic field of the electromagnetic field mathematical model to obtain an electromagnetic field result;
s3: taking the electromagnetic field result as a load, and calculating the stress and strain of the winding at the moment of short circuit impact;
s4: analyzing the position of the winding which generates deformation at the moment of short circuit;
s5: replacing the original wire with a heat-resistant self-adhesive transposed wire at the deformed position;
s1, establishing a distribution transformation simplified three-dimensional model through Solidworks, and introducing the model into a Maxwell electromagnetic field;
s2, calculating an electromagnetic field of the electromagnetic field mathematical model, wherein the electromagnetic field comprises boundary condition setting, grid division, excitation adding and solver setting; building a short-circuit fault simulation model taking a transformer as a core on a simulink platform, performing simulation calculation to obtain a transformer short-circuit current waveform, and then taking the short-circuit current as an excitation source for solving an electromagnetic field by adopting a field sequential coupling mode;
s4, analyzing the deformation positions of the windings at the moment of short circuit, wherein the deformation positions comprise the most easy deformation positions. Obtaining the maximum deformation position and the maximum stress position of the winding under short-circuit impact, comparing the yield strength of the national standard lower lead, and analyzing the weak point under short-circuit impact; finally, a high-strength self-adhesive transposed conductor is adopted to replace the original common winding which is easy to generate plastic deformation.
2. The improved winding structure method for improving the short-circuit resistance of a transformer according to claim 1, wherein both ends of the self-adhesive transposed conductor are connected by butt welding.
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| CN113806974B (en) * | 2021-08-06 | 2023-10-17 | 南方电网科学研究院有限责任公司 | Stability evaluation method, device and system for electric connection of transformer bushing |
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| CN106682362A (en) * | 2017-01-18 | 2017-05-17 | 广东电网有限责任公司电力科学研究院 | Method and device for computing C-phase short-circuit electromagnetic field of 220kV three-phase transformer |
| CN107290622A (en) * | 2016-12-23 | 2017-10-24 | 沈阳工业大学 | The four-dimensional analytic approach that a kind of Transformer Winding short-circuit strength judges |
| WO2018101158A1 (en) * | 2016-12-02 | 2018-06-07 | 梨木 政行 | Motor and control device thereof |
| CN109344563A (en) * | 2018-12-21 | 2019-02-15 | 沈阳工业大学 | A kind of three dimensional analysis method of transformer winding short circuit trouble point change in shape prediction |
| CN109342875A (en) * | 2018-12-21 | 2019-02-15 | 沈阳工业大学 | A kind of transformer winding short trouble damage independent positioning method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101299380A (en) * | 2008-03-11 | 2008-11-05 | 保定天威集团有限公司 | Transformer high temperature index self-adhering transposition conductor and preparation method thereof |
| CN110955990B (en) * | 2019-11-15 | 2023-03-07 | 福州天宇电气股份有限公司 | Transformer winding transient deformation quantity calculation method based on multiple physical coupling fields |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018101158A1 (en) * | 2016-12-02 | 2018-06-07 | 梨木 政行 | Motor and control device thereof |
| CN107290622A (en) * | 2016-12-23 | 2017-10-24 | 沈阳工业大学 | The four-dimensional analytic approach that a kind of Transformer Winding short-circuit strength judges |
| CN106682362A (en) * | 2017-01-18 | 2017-05-17 | 广东电网有限责任公司电力科学研究院 | Method and device for computing C-phase short-circuit electromagnetic field of 220kV three-phase transformer |
| CN109344563A (en) * | 2018-12-21 | 2019-02-15 | 沈阳工业大学 | A kind of three dimensional analysis method of transformer winding short circuit trouble point change in shape prediction |
| CN109342875A (en) * | 2018-12-21 | 2019-02-15 | 沈阳工业大学 | A kind of transformer winding short trouble damage independent positioning method |
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