The pillar porcelain insulator is an important protection device that is related to the safety of the entire power grid. Small damage of it may even cause a disaster. Nonlinear output frequency response functions (NOFRFs) can well reflect the nonlinear characteristics of early damage in the system. This paper uses the NOFRF entropy-based harmonic excitation detection method to detect the damage of the structure. Its effect has been verified by using metal specimens. Then, the pulse hammer detection and harmonic detection are carried out to detect the early-stage damage of the pillar porcelain insulator, and they achieve a good result, which verifies that the harmonic detection method can detect the early-stage damage in the pillar porcelain insulator as well. In addition, the orthogonal test of the simulated breathing crack model is used to search the greatest influence of the parameters of crack on the detection index. Through the orthogonal analysis, the results show that among the lengths, positions, and angles of the crack, the length of crack is the main factor that affects the detection index.

中文翻译：

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基于NOFRF熵的柱状瓷绝缘子早期损伤检测方法的研究

支柱瓷绝缘子是重要的保护装置，关系到整个电网的安全。小小的损坏甚至可能会造成灾难。非线性输出频率响应函数（NOFRF）可以很好地反映系统中早期损坏的非线性特征。本文使用基于NOFRF熵的谐波激励检测方法来检测结构的损伤。其效果已通过使用金属标本进行了验证。然后，通过脉冲锤检测和谐波检测对支柱瓷绝缘子的早期损伤进行检测，取得了良好的效果，验证了谐波检测方法可以对支柱瓷绝缘子的早期损伤进行检测。绝缘子。此外，通过模拟呼吸裂纹模型的正交试验，寻找裂纹参数对检测指标的最大影响。通过正交分析，结果表明，在裂纹的长度，位置和角度中，裂纹的长度是影响检测指标的主要因素。