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The insulation resistance of the outer sheath of high-voltage cables is an important parameter for measuring the insulation state of high-voltage cables. In this paper, an online monitoring method based on metal sheath circulation current was proposed to evaluate the insulation resistance of the outer sheath of high-voltage cables, so as to realize the real-time monitoring of the insulation state of high-voltage cables. The formation of mental sheath circulation current and its relationship with the insulation resistance of outer sheath were analyzed, and a calculation model was derived. Then the online monitoring of high-voltage cable with single-end grounding and cross-linked grounding have been carried out. The results show that the error between the online monitoring method and the offline measurement method is less than 20%, and the measurement effect of the method is significantly better in the cross-linked grounding segments than in the two-sided cable segments, which is of great significance for the condition monitoring and fault location of the metal sheath of high-voltage cables.
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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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