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In this study, a method of using ultrasonic technology to detect the internal defects of composite insulator silicone rubber for high-voltage transmission lines was proposed. Taking composite insulator silicone rubber samples with different internal defects as the research object, a phased array ultrasonic probe with 1/4 wavelength of sound transmission layer thickness was selected, and the samples were conducted multi-angle scanning and non-destructive testing by direct contact method. A two-dimensional cross-section finite element model of samples was constructed by ANSYS software to analyze the defects. Then, the detection accuracy of internal defects of composite insulator silicone rubber was improved by reducing the influence of blind spots and sidelobes and improving the resolution ratio. The results show that the ultrasonic waveforms of defective silicone rubber samples differ greatly from that of normal silicone rubber sample. The internal damage or structural penetration defects of composite insulator silicone rubber can be effectively detected by the ultrasonic technology, and the location of defects can be accurately located. The metal fittings on composite insulators will affect the accuracy of ultrasonic detection.
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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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