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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.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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