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Cracking Analysis of a Brass Clamp Mounted on the Main Transformer in the Power Grid System

Author

Listed:
  • Jiahui Chen

    (State Grid Sichuan Electric Power Research Institute, Chengdu 610000, China)

  • Jie Feng

    (State Grid Sichuan Electric Power Research Institute, Chengdu 610000, China)

  • Fangqiang Wang

    (State Grid Sichuan Electric Power Research Institute, Chengdu 610000, China)

  • Qian Peng

    (State Grid Sichuan Electric Power Research Institute, Chengdu 610000, China)

  • Guitian Lan

    (College of Electrical Engineering, Sichuan University, Chengdu 610000, China)

  • Lihua Zhao

    (College of Electrical Engineering, Sichuan University, Chengdu 610000, China)

  • Longwen Wu

    (College of Electrical Engineering, Sichuan University, Chengdu 610000, China)

Abstract

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.

Suggested Citation

  • Jiahui Chen & Jie Feng & Fangqiang Wang & Qian Peng & Guitian Lan & Lihua Zhao & Longwen Wu, 2023. "Cracking Analysis of a Brass Clamp Mounted on the Main Transformer in the Power Grid System," Energies, MDPI, vol. 16(8), pages 1-11, April.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:8:p:3460-:d:1123914
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