摘要
高压断路器瓷套的断裂故障会对电力系统的安全稳定运行带来严重危害,而裂纹临界尺寸是瓷套断裂的重要判定参数。基于裂纹应力强度因子的数值计算方法及三维裂纹实体建模法,结合高压断路器瓷套的基本结构及运行情况,建立了瓷套热-结构耦合有限元计算模型及裂纹临界尺寸计算模型,计算分析了不同位置、不同长深比和不同弯曲载荷下的裂纹临界尺寸大小,获得了瓷套裂纹临界尺寸的最小值和分布位置及其随裂纹位置、裂纹长深比、弯曲载荷的变化规律。本文研究成果可为高压断路器瓷套无损探伤灵敏度的确定及瓷套运行状况的评估提供有效的理论参考和技术支持。
The fracture failure of high voltage circuit breaker porcelain bushing have a serious impact on the safe and stable operation of the power system,and the critical crack size is an important judgment parameter for the fracture of porcelain bushing. Based on the numerical calculation method of the stress intensity factor and the three-dimensional crack entity modeling method,combined with the basic structure and the operation situation of the high voltage circuit breaker porcelain bushing,the thermal-structure coupling finite element calculation model and critical crack size calculation model of the porcelain bushing was established,and make a calculation and analysis of the critical size of the crack under different position,different length-to-depth ratio and different bending load,obtained the minimum critical crack size and its distribution location of the porcelain bushing and the changing rule of critical crack size with the position of crack,crack length-to-depth ratio and the bending load. The research results provide the determination of nondestructive flaw detection sensitivity and the theoretical basis and technical support for the performance evaluation of the porcelain bushing.
作者
杨飞
耿超
YANG Fei;GENG Chao(State Grid Xuyi Power Supply Company,Xuyi 211700,China;State Grid Huaian Power Supply Company,Huaian 223001,China)
出处
《电瓷避雷器》
CAS
北大核心
2018年第6期198-203,209,共7页
Insulators and Surge Arresters
关键词
断路器瓷套
裂纹
应力强度因子
有限元
裂纹临界尺寸
circuit breaker porcelain bushing
crack
stress intensity factor
finite element
critical cracksize
