基于振动模态的复合绝缘子酥朽检测与诊断方法  

Detection and diagnosis method for decay-like of composite insulator based on vibration mode

作　　者：刘志超 郑书生[1] 陈闽江 关安旭 LIU Zhichao;ZHENG Shusheng;CHEN Minjiang;GUAN Anxu(State Key Laboratory of Alternate Electric Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;State Grid Fujian Electric Power Research Institute,Fuzhou 350007,China;BYD Company Limited,Shenzhen 518118,China)

机构地区：[1]华北电力大学新能源电力系统全国重点实验室,北京102206 [2]国网福建省电力有限公司电力科学研究院,福建福州350007 [3]比亚迪股份有限公司,广东深圳518118

出　　处：《绝缘材料》2025年第2期110-120,共11页Insulating Materials

摘　　要：首先对芯棒酥朽试样的理化特征进行分析,并研究芯棒酥朽对其力学性能的影响,然后利用仿真对复合绝缘子芯棒的振动模态进行分析,研究特征频率与酥朽程度的关系,最后针对酥朽复合绝缘子提出了一种振动激励检测方法,并对存在不同程度酥朽缺陷的110 kV复合绝缘子芯棒的振动模态特征频率进行测量分析。结果表明:芯棒中环氧树脂的完全降解以及玻璃纤维的水解、粉化使酥朽区域丧失力学性能,导致芯棒整体刚度、抗拉伸性能、抗形变性能降低;与完好芯棒相比,酥朽芯棒3~5阶振动模态的特征频率降低了2.8%~14.3%,高阶振动模态的特征频率降幅更明显,降幅随酥朽程度增大而增大。基于振动模态的酥朽检测方法可以对复合绝缘子的酥朽程度进行诊断,同时可以反映其力学性能变化,适用于复合绝缘子酥朽的无损检测。Firstly,the physico-chemical characteristics of the decay-like core rod were analyzed,and the effect of decay-like on the mechanical properties of the core rod was studied.And then,the vibration modes of composite insulator core rods were analyzed by simulation,and the relationship between characteristic frequency and the decay-like degree was studied.Finally,a vibration excitation detection method was proposed for decay-like composite insulator,and the characteristic frequencies of the 110 kV composite insulators with different degrees of decay-like defects were measured and analyzed.The results show that the complete degradation of epoxy resin and the hydrolysis and pulverization of glass fibers in the core rod make the decay-like region loss mechanical properties,leading to the decrease in the overall stiffness,tensile resistance,and deformation resistance of the core rod.Compared with the intact core rod,the characteristic frequencies of 3-5 order vibration mode of decay-like core rod decrease by 2.8%-14.3%,the decreasing range of characteristic frequencies of higher order vibration modes decrease more obvious,and the decreasing range increases with the increase of decay-like degree.The decay-like detection method based on vibration mode can diagnose the decay-like degree of composite insulator,and also can reflect the changes of its mechanical properties,which is suitable for non-destructive detection of decay-like in composite insulators.

关 键 词：复合绝缘子 酥朽检测 力学性能 振动模态 特征频率 

分 类 号：TM216[一般工业技术—材料科学与工程]