Proceedings of the 2024 6th International Conference on Civil Engineering, Environment Resources and Energy Materials (CCESEM 2024)

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Fracture Causes of the Al-6Zn-2Cu-1Mg Alloy Transformer Bushing Cover Plate

Authors
Chao Li1, Jiacheng Li2, Chaohua Wang1, Yongfeng Zhao1, Hua Zhu1, Junli Du1, *
1Electric Power Research Institute, State Grid Henan Electric Power Company, Zhengzhou, 450052, China
2Henan Jiuyu Epri Electric Power Technology Co. LTD., Zhengzhou, 450052, China
*Corresponding author. Email: dujunlizz@163.com
Corresponding Author
Junli Du
Available Online 24 December 2024.
DOI
10.2991/978-94-6463-606-2_16How to use a DOI?
Keywords
Aluminum alloy; Transformer sealing cover plate; Corrosion; Grain boundary corrosion
Abstract

Cracking occurred on the aluminum alloy sealing cover of a transformer in a 220kV substation after three years of operation. To investigate the cause, a systematic analysis was conducted on its chemical composition, macroscopic appearance, and microscopic morphology. The results revealed that the sealing cover was made of a 7xxx series aluminum alloy with a composition of Al-6Zn-2Cu-1Mg, which does not comply with the requirements of Q/GDW11717-2023, “Technical Supervision Guidelines for Metal Equipment in Power Grids” (Section 4.4.1 states that “Series 2 and Series 7 aluminum alloys should not be used”), indicating that the material was unqualified. The Al-6Zn-2Cu-1Mg aluminum alloy contains a large number of second-phase particles at the grain boundaries, which have a significant potential difference with the matrix aluminum alloy, leading to a susceptibility to intergranular corrosion. The sealing cover underwent stress corrosion cracking in a stressful and corrosive environment.

Copyright
© 2024 The Author(s)
Open Access
Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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Volume Title
Proceedings of the 2024 6th International Conference on Civil Engineering, Environment Resources and Energy Materials (CCESEM 2024)
Series
Advances in Engineering Research
Publication Date
24 December 2024
ISBN
978-94-6463-606-2
ISSN
2352-5401
DOI
10.2991/978-94-6463-606-2_16How to use a DOI?
Copyright
© 2024 The Author(s)
Open Access
Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

Cite this article

risenwbib
TY  - CONF
AU  - Chao Li
AU  - Jiacheng Li
AU  - Chaohua Wang
AU  - Yongfeng Zhao
AU  - Hua Zhu
AU  - Junli Du
PY  - 2024
DA  - 2024/12/24
TI  - Fracture Causes of the Al-6Zn-2Cu-1Mg Alloy Transformer Bushing Cover Plate
BT  - Proceedings of the 2024 6th International Conference on Civil Engineering, Environment Resources and Energy Materials (CCESEM 2024)
PB  - Atlantis Press
SP  - 135
EP  - 144
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-606-2_16
DO  - 10.2991/978-94-6463-606-2_16
ID  - Li2024
ER  -