This paper investigates a feasible nondestructive method for micron-sized kissing defects in the composite insulators, which are commonly utilized in ultra-high voltage (UHV) power grid. In this paper, cylindrical adhesive contact model was established to describe the obvious distortion of ultrasound propagation caused by kissing defects on the polymeric interface of composite insulators. The ultrasonic nonlinearity parameter was measured for each of the kissing defective and intact specimens. Moreover, the theoretical analysis has been proved by the test results on the kissing defective samples, which indicates that the 0.7 μm kissing defects existed in the composite insulators could be successfully recognized by the nonlinear ultrasonic methods and the nonlinearity is reduced by interface roughness.

中文翻译：

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高压复合绝缘子接吻缺陷非线性超声无损检测与建模

本文研究了一种可行的非破坏性方法，用于修复超高压 (UHV) 电网中常用的复合绝缘子中的微米级接吻缺陷。本文建立了圆柱黏着接触模型来描述复合绝缘子聚合物界面上的接吻缺陷引起的超声传播的明显畸变。测量每个有缺陷和完整的接吻样品的超声非线性参数。此外，理论分析还通过对接吻缺陷样品的测试结果进行了验证，表明非线性超声方法可以成功识别复合绝缘子中存在的0.7μm的接吻缺陷，并且界面粗糙度降低了非线性。