Cracking Analysis of a Brass Clamp Mounted on the Main Transformer in the Power Grid System
Cracking of conductive brass accessories in substations causes overheating or an open circuit, seriously affecting the safe and stable operation of the power grid system. A deep understanding of failure mechanisms could provide more safety, as well as lower down costs and save time for the power gri...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-04-01
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| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/16/8/3460 |
| _version_ | 1797605575691862016 |
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| author | Jiahui Chen Jie Feng Fangqiang Wang Qian Peng Guitian Lan Lihua Zhao Longwen Wu |
| author_facet | Jiahui Chen Jie Feng Fangqiang Wang Qian Peng Guitian Lan Lihua Zhao Longwen Wu |
| author_sort | Jiahui Chen |
| collection | DOAJ |
| description | Cracking of conductive brass accessories in substations causes overheating or an open circuit, seriously affecting the safe and stable operation of the power grid system. A deep understanding of failure mechanisms could provide more safety, as well as lower down costs and save time for the power grid system, which have been seldomly involved in the literature. This paper presents a cracking analysis of a brass clamp in service for seven years that is mounted on the main transformer. The fracture morphology, chemical composition, and metallographic structure of the brass clamp were systematically analyzed, and the stress conditions were obtained by finite element simulation. The clamp exhibits transgranular brittle fracture with high oxygen content in the fracture, containing a crack propagation along the Pb particle connecting pathways, and the stress concentration was confirmed at the crack position. It is concluded that the failure was a result of the stress corrosion cracking and excessive content of Pb. Suggestions were proposed to avoid malfunction of the main transformer caused by the clamp crack. |
| first_indexed | 2024-03-11T05:03:02Z |
| format | Article |
| id | doaj.art-5abd77cec0774ff1b2524fdef8d39444 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-11T05:03:02Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-5abd77cec0774ff1b2524fdef8d394442023-11-17T19:05:29ZengMDPI AGEnergies1996-10732023-04-01168346010.3390/en16083460Cracking Analysis of a Brass Clamp Mounted on the Main Transformer in the Power Grid SystemJiahui Chen0Jie Feng1Fangqiang Wang2Qian Peng3Guitian Lan4Lihua Zhao5Longwen Wu6State Grid Sichuan Electric Power Research Institute, Chengdu 610000, ChinaState Grid Sichuan Electric Power Research Institute, Chengdu 610000, ChinaState Grid Sichuan Electric Power Research Institute, Chengdu 610000, ChinaState Grid Sichuan Electric Power Research Institute, Chengdu 610000, ChinaCollege of Electrical Engineering, Sichuan University, Chengdu 610000, ChinaCollege of Electrical Engineering, Sichuan University, Chengdu 610000, ChinaCollege of Electrical Engineering, Sichuan University, Chengdu 610000, ChinaCracking of conductive brass accessories in substations causes overheating or an open circuit, seriously affecting the safe and stable operation of the power grid system. A deep understanding of failure mechanisms could provide more safety, as well as lower down costs and save time for the power grid system, which have been seldomly involved in the literature. This paper presents a cracking analysis of a brass clamp in service for seven years that is mounted on the main transformer. The fracture morphology, chemical composition, and metallographic structure of the brass clamp were systematically analyzed, and the stress conditions were obtained by finite element simulation. The clamp exhibits transgranular brittle fracture with high oxygen content in the fracture, containing a crack propagation along the Pb particle connecting pathways, and the stress concentration was confirmed at the crack position. It is concluded that the failure was a result of the stress corrosion cracking and excessive content of Pb. Suggestions were proposed to avoid malfunction of the main transformer caused by the clamp crack.https://www.mdpi.com/1996-1073/16/8/3460brass clampstress corrosion crackingfracturefailure |
| spellingShingle | Jiahui Chen Jie Feng Fangqiang Wang Qian Peng Guitian Lan Lihua Zhao Longwen Wu Cracking Analysis of a Brass Clamp Mounted on the Main Transformer in the Power Grid System Energies brass clamp stress corrosion cracking fracture failure |
| title | Cracking Analysis of a Brass Clamp Mounted on the Main Transformer in the Power Grid System |
| title_full | Cracking Analysis of a Brass Clamp Mounted on the Main Transformer in the Power Grid System |
| title_fullStr | Cracking Analysis of a Brass Clamp Mounted on the Main Transformer in the Power Grid System |
| title_full_unstemmed | Cracking Analysis of a Brass Clamp Mounted on the Main Transformer in the Power Grid System |
| title_short | Cracking Analysis of a Brass Clamp Mounted on the Main Transformer in the Power Grid System |
| title_sort | cracking analysis of a brass clamp mounted on the main transformer in the power grid system |
| topic | brass clamp stress corrosion cracking fracture failure |
| url | https://www.mdpi.com/1996-1073/16/8/3460 |
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