为消除硅橡胶复合绝缘子缺陷对电网安全运行造成的隐患，在对超声检测原理研究的基础上提出采用识别相位差异与幅值差异的方法来检测是否存在缺陷，并介绍了复合绝缘子超声检测系统研制过程中的各关键技术环节。经过实际运行证明，该系统能快速可靠地检测出复合绝缘子护套与芯棒界面间的内部缺陷，具有检测结果直观、判别准确和可视化成像等优点。

Present work aims to eliminate the danger to the safety of power caused by composite insulator defect. On the basis of ultrasonic testing principle, the NDT method is proposed to judge whether the defect exists, and all key technological aspects are introduced in the development of ultrasonic testing system for composite insulator. The actual operation proves that the system can quickly and reliably detect the internal defects of insulator between sheath and core, with the advantages of intuitive results, accurate identifying and visual imaging. And it also proves that the system has important theoretical and practical significance to the further research and development of new automatic ultrasonic defector of composite insulator.