在役含缺陷棒形悬式瓷绝缘子的非破坏性可靠性评定  

Nondestructive Evaluation of Reliability with Creeping Wave for Porcelain Rod Suspension Insulator Served

作　　者：徐连勇[1] 荆洪阳[1] 霍立兴[1] 樊利国[1] 

机构地区：[1]天津大学材料科学与工程学院,天津300072

出　　处：《天津大学学报》2006年第10期1258-1263,共6页Journal of Tianjin University(Science and Technology)

基　　金：国家自然科学基金资助项目(50275107);霍英东青年教师基金资助项目(81045)

摘　　要：分析了超声爬波检测瓷绝缘子的可行性,加工制作了爬波检测专用试块.通过试验对比了单晶爬波探头与双晶爬波探头检测瓷绝缘子的优缺点.采用ANSYS有限元分析软件分析了绝缘子胶装部位(易断裂部位)的温度及结构应力.分析结果表明,沥青缓冲层显著降低了胶装部位的应力大小,改变了该部位的应力分布.根据有限元分析结果找出承受最大应力的部位,应用断裂力学方法计算出该应力下的最小临界裂纹尺寸,为瓷绝缘子无损检测提供了一定的理论指导.The feasibility of examining electrical porcelain insulator （EPI） with creeping wave probe was studied, and a special test block was made for the experiment. The finite element method （FEM） was adopted to analyze temperature-structural stress in the EPI. The result shows that the stress was significantly reduced and the distribution of the stress was changed owing to the existence of asphalt buffer layer. The maximum stress was found according to the result of FEM. Therefore, the minimum critical crack size can be computed using the fracture mechanics approach, which can serve as guidance for nondestructive examination of the EPI.

关 键 词：瓷绝缘子 缓冲层 温度结构应力 无损检测 爬波探头 有限元方法 

分 类 号：TG115.28[金属学及工艺—物理冶金]