Power Transformer Based on Field-circuit Coupling in Different Operating Modes Simulation Ｒesearch on Leakage Magnetic Field
In view of the change in the operation mode of the transformer，under the impact of the short-circuit current of the transformer，the magnetic field distribution characteristics of the windings are different. In this paper， a field-circuit coupling finite element simulation method is adopted. Taking a...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Harbin University of Science and Technology Publications
2021-08-01
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| Series: | Journal of Harbin University of Science and Technology |
| Subjects: | |
| Online Access: | https://hlgxb.hrbust.edu.cn/#/digest?ArticleID=1990 |
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| Summary: | In view of the change in the operation mode of the transformer，under the impact of the short-circuit current of the transformer，the magnetic field distribution characteristics of the windings are different. In this paper， a field-circuit coupling finite element simulation method is adopted. Taking a SSZ11 － 50000 /110 three-phase three-winding power transformer as the research object，a simulation model of the transformer is established. In operation mode，when a three-phase short-circuit fault occurs in the medium voltage side winding，the transient magnetic field leakage under the three conditions of maximum tap，rated tap and minimum tap of the winding is calculated，and the different windings under three different tap situations are analyzed. The distribution law of the maximum magnetic induction intensity in the axial and radial directions of the location. The simulation results show that the distribution of the leakage magnetic field of the winding in the short-circuit process is related to the operating state，time and space. When t = 0. 01 s，as the short-circuit current reaches the maximum value，the values of the transient magnetic field leakage in the axial and radial directions of the winding are both maximum， and the distribution law of the leakage magnetic field in the inner，outer，middle outer and radial directions of the winding axis The difference is obvious. At the same time，the switching of the three different tapping types has a greater impact on the distortion of the magnetic induction intensity of the high-voltage winding，and less influence on the distortion of the magnetic induction intensity of the medium-voltage winding. The above calculation results provide a theoretical reference for the design of transformer winding structure.
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| ISSN: | 1007-2683 |