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High sensitivity defect detection technology is urgently needed to evaluate the health status of gas insulated metal enclosed switchgear (GIS) insulator. In this paper, a defect detection method for GIS basin insulator based on ultrasonic scanning frequency signal injection was proposed. The propagation law of scanning frequency ultrasonic signals on clean/defective basin insulators were investigated by simulation and experiment, and three defects including internal bubbles, surface cracks, and surface metal particle attachment were considered. In the simulation and experiment, the ultrasonic emission and reception probes were located opposite the flange of the basin insulator. The ultrasonic scanning signal was a frequency conversion sine wave with an amplitude of 1 V and a frequency range of 0.5-1 MHz, which was energized by the transmitting probe and injected into the basin insulator through a flange, and the ultrasonic signal was received by the receiving probe on the opposite side. The results show that the ultrasonic signal directly propagates through the basin insulator to the receiving piezoelectric probe, and the amplitude of the time-domain ultrasonic signal received on the defective insulator is higher than that on the clean insulator, but it is still difficult to be used as a basis for evaluating the health status of the insulator. The main frequency of ultrasonic signals propagated through detective insulators is lower than that propagated through clean insulators. The main frequency signals propagated through clean, crack containing, metal particle defective, and bubble defective insulators are 24.00, 14.83, 10.51, and 12.13 kHz, respectively, which can be used as the basis for defect detection of GIS basin 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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