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The interfacial characteristic between the shielding layer and insulation layer is a key factor determining the service life and operational reliability of the high-voltage cables. This study focused on the regulation of the dispersion of conductive carbon black (CB), and investigated the impact of interfacial characteristics between the shielding layer and cross-linked polyethylene (XLPE) insulation layer. The semi-conductive shielding materials with two different formulations were prepared, and an imported semi-conductive shielding material was selected as a comparison sample, then the mechanical, thermal, and electrical compatibility between the shielding materials and insulation layer were comprehensively evaluated. The results show that the introduction of polymer dispersant polyvinylpyrrolidone (PVP) into the matrix resin significantly improves the dispersibility of CB. The mechanical compatibility between the shielding layer and insulation layer is predominantly influenced by crosslinking, and an optimal crosslinking compatibility can enhance the interfacial adhesion and prevent delamination. The PVP-modified shielding layers exhibit better thermal compatibility with the insulation layer in terms of the coefficient of thermal expansion, and show superior thermal conductivity compared to the imported shielding material. Furthermore, the improved CB dispersion optimizes electrical compatibility between shielding layer and insulation layer, elevating the AC electrical strength at the shield-insulation 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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