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At first, the insulation level of returned cable was analyzed by ultra-low frequency (VLF) dielectric loss test method and microscope observation method. And then, the organic-inorganic composite repair fluid was injected into the cable core through a repair system. After repairing for 24 h, the generated filler was analyzed by scanning electron microscopy (SEM) and infrared spectroscopy (IR), and the insulation level of the cable after repairing was analyzed by VLF dielectric loss test method and breakdown voltage test method. The microscopic test results show that after injecting the organic-inorganic composite repair fluid, the micropores and defects will be filled during the penetration and reaction process of repair fluid in cable insulation layer, both the number and size of micropores in repaired cable insulation are smaller than those in unrepaired sample, at the same time, the hydroxyl absorption peak is reduced significantly. The VLF dielectric loss test results show that the performance indexes of the cable after repairing is enhanced, and the breakdown voltage is improved. It is proved that the organic-inorganic composite repairing technology can improve the insulating properties of field returned cable effectively and prolong the cable insulation life.
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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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