500 kV变电站断路器导气管接头开裂原因  

Cracking causes for airway joint of circuit breaker in 500 kV substation

作　　者：黄蓉 王军 谢亿 冯超 HUANG Rong;WANG Jun;XIE Yi;FENG Chao(Hunan Xiangdian Test&-Research Institute Co.,Ltd.,Changsha 410004,China;Power Science Research Institute,State Grid Hunan Electric Power Co.,Ltd.,Changsha 410007,China)

机构地区：[1]湖南省湘电试验研究院有限公司,长沙410004 [2]国网湖南省电力公司电力科学研究院,长沙410007

出　　处：《理化检验（物理分册）》2022年第5期30-33,39,共5页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：某500 kV变电站高压六氟化硫断路器导气管接头开裂导致泄压故障,采用宏观观察、化学成分分析、硬度测试、金相检验、氨熏试验、扫描电镜和能谱分析等方法,对断路器导气管接头开裂的原因进行了分析。结果表明:导气管接头的显微组织异常,铅元素的宏观偏析,加工、热处理和安装过程产生的内应力以及腐蚀介质的存在,导致接头因应力腐蚀而开裂失效。Cracking airway joint of high voltage sulfur hexafluoride circuit breaker in 500 kV substation was analyzed by using macroscopic observation,chemical composition analysis,hardness test,metallographic examination,ammonia fumigation test,scanning electron microscopy and energy spectrum analysis.The experimental results show that the abnormal metallographic structure and the macroscopic segregation of lead elements,the internal stress generated during processing,heat treatment and installation and the existence of corrosive media,which led to the cracking failure of the joint due to stress corrosion.

关 键 词：高压六氟化硫断路器 导气管接头 宏观偏析 应力腐蚀开裂 

分 类 号：TG115.2[金属学及工艺—物理冶金]