摘要
某变电站GIS设备黄铜三通阀法兰出现大批量的断裂或开裂现象,易导致SF 6气体泄漏,存在严重安全隐患。文中通过对失效三通阀的宏观形貌、化学成分、金相组织、结构等多方面进行分析、研究,明确了三通阀的开裂原因并提出改进措施。结果表明三通阀法兰材质为铅黄铜,因结构设计及装配方式不当受到较大的周向拉应力,在周围环境含有氧、硫元素的腐蚀性作用下,沿法兰的应力集中区域发生应力腐蚀开裂。
A large number of fractures or cracks occurs in brass three-way valve flange of GIS equipment in a substation,which is easy to cause SF 6 gas leakage and has serious safety hazards.Through the analysis and research on macroscopic appearance,chemical composition,metallographic structure,structure of the failed three-way valve,the reasons for the cracking of three-way valve are clarified and the improvement measures are put forward.Results show that the flange of three-way valve is lead brass and subjected to large circumferential tensile stress due to improper structural design and assembly method.Under the action of surrounding corrosive environment containing oxygen and sulfur elements,stress corrosion cracking occurs along the stress concentration area of the flange.
作者
赵兴虹
陈家慧
冯杰
彭倩
王方强
ZHAO Xinghong;CHEN Jiahui;FENG Jie;PENG Qian;WANG Fangqiang(Gaoxin District Branch of Sichuan Shuneng Electric Power Co.,Ltd.,Chengdu 610041,Sichuan,China;State Grid Sichuan Electric Power Research Institute,Chengdu 610041,Sichuan,China)
出处
《四川电力技术》
2023年第3期81-84,共4页
Sichuan Electric Power Technology
基金
国网四川省电力公司科技项目(5219972000311)。
关键词
GIS
黄铜
三通阀
应力腐蚀
开裂
GIS
brass
three-way valve
stress corrosion
cracking
