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Structural stochastic reliability of testing transformers with impulse current under short-circuit condition based on the magnetic field-circuit coupling
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Zhiwei CHEN, Xuefeng WU, Xiaowei LI, Zhongda PAN, Xuyang WU
Journal of Mechanical Strength | 2025, 47(4) : 131 - 138
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Journal of Mechanical Strength | 2025, 47(4): 131-138
• ∙Optimization∙Reliability∙ •
Structural stochastic reliability of testing transformers with impulse current under short-circuit condition based on the magnetic field-circuit coupling
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Zhiwei CHEN, Xuefeng WU, Xiaowei LI, Zhongda PAN, Xuyang WU
Affiliations
  • State Grid Zhejiang Electric Power Co, Ltd Jinhua Power Supply Company, Jinhua 321000, China
Published: 2025-04-15 doi: 10.16579/j.issn.1001.9669.2025.04.016
Outline
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Impulse current under short-circuit condition is the key factor for the structural reliability of the testing transformer. Therefore, the structural reliability analysis model of transformers was proposed based on the probability density evolution theory. Firstly, the basic principle of probability density evolution theory was introduced, and the analysis method of electromagnetic force field for windings was given considering the coupling effects of magnetic and electric fields. On the basis，the numerical analysis model of transformers structure was constructed by using the Abaqus software finite element analysis method. Taking an AGF 20 kV testing transformer as an example, the above model was validated. The longitudinal Mises stress of windings was chosen as the control variable, and the stress distribution and probability density evolution characteristics were given. Then, the structural reliability index was calculated, and the extreme mechanical response and the corresponding distribution zones of windings and iron cores were discussed. The results show that the stress of windings increases significantly under the action of short-circuit impulse current. The maximum value of windings’stress reaches 82%of the threshold, and plays the key role in structural reliability, the increase of impedance has obvious influence on the reliability of transformers.

Testing transformer  /  Structural reliability  /  Winding  /  Probability density evolution  /  Short-circuit
Zhiwei CHEN, Xuefeng WU, Xiaowei LI, Zhongda PAN, Xuyang WU. Structural stochastic reliability of testing transformers with impulse current under short-circuit condition based on the magnetic field-circuit coupling[J]. Journal of Mechanical Strength, 2025 , 47 (4) : 131 -138 . DOI: 10.16579/j.issn.1001.9669.2025.04.016
Funding
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  • National Natural Science Foundation of China(51777119)
  • State Grid Zhejiang Electric Power Co., Ltd. Technology Project(CF058713002022002)
Appendix
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Year 2025 volume 47 Issue 4
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Article Info
doi: 10.16579/j.issn.1001.9669.2025.04.016
  • Receive Date：2023-08-31
  • Online Date：2026-03-20
  • Published：2025-04-15
Article Data
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History
  • Received：2023-08-31
  • Revised：2023-09-28
Funding
National Natural Science Foundation of China(51777119)
State Grid Zhejiang Electric Power Co., Ltd. Technology Project(CF058713002022002)
Affiliations
    State Grid Zhejiang Electric Power Co, Ltd Jinhua Power Supply Company, Jinhua 321000, China

Corresponding:

CHEN Zhiwei, E-mail：
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表12种不同金属材料的力学参数
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Number of
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Number of
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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