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To investigate the rejuvenation effect and enhancement mechanism of the voltage stabilizer-containing rejuvenation fluid on moisture-affected XLPE/SiR interface, XLPE was sanded by sandpapers with different granularities to prepare XLPE/SiR interface samples. At first, the surface roughness of the samples was measured using a profilometer, and interfacial breakdown tests were conducted. Then, the samples were subjected to moisture tests. After that, the antioxidant 300 and ferrocene were selected as voltage stabilizers, and five rejuvenation fluids with different stabilizer content were prepared to rejuvenate the moisture-affected interfaces. The interface samples before and after rejuvenation were further analyzed by surface profilometry, Fourier transform infrared spectroscopy (FTIR), polarization-depolarization current (PDC), and interface breakdown tests. The results show that the interfacial breakdown voltage decreases with the increase of surface roughness, while the moisture exposure elevates the interfacial DC conductivity and dielectric loss factor and decreases the interfacial breakdown voltage. After the rejuvenation, the interface roughness, DC conductivity, and dielectric loss factor of the samples decrease, and the rejuvenated product can homogenize the electric field distribution between the cavity and the solid dielectrics, and significantly increase the interfacial breakdown voltage. Moreover, the addition of antioxidant 300 and ferrocene can enhance the interfacial breakdown voltage, and ferrocene has a better improvement effect on the insulation performance of the moisture-exposed interface.
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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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