Open AccessAnalysis on Stress Corrosion Cracking of Brass Connecting Nut Utilized in Pneumatic Mechanism for 500kV Tank Circuit Breaker
Author(s) -
Hao Chen,
Tao Zhang,
Yingjun Wang,
Jianjun Zheng
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1676/1/012240
Subject(s) - brass , circuit breaker , corrosion , fracture (geology) , materials science , stress (linguistics) , cracking , stress corrosion cracking , metallurgy , nut , structural engineering , head (geology) , composite material , engineering , mechanical engineering , geology , linguistics , philosophy , geomorphology , copper
Circuit breaker is an on-load device that can interrupt load or short-circuit current. Recently, failure of component used in circuit breaker occurs frequently, thus the safety and stability of power grids is severely affected. In this paper, the fracture cause of a brass connecting nut of tank circuit breaker for 500 kV substation was investigated by means of macro-morphology inspection, chemical composition analysis, microstructure analysis, fracture morphology analysis, numerical simulation and energy spectrum analysis. The result showed that the fracture of the brass connecting nut was mainly caused by stress corrosion and stress concentration. Meanwhile the poor mechanical properties due to improper manufacture process, accelerated the development of the stress corrosion cracking of the brass connecting nut.