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Cross-linked polyethylene (XLPE) and silicone rubber (SIR) are commonly used insulation materials for high-voltage direct current cables and reinforced insulation materials for accessories at present. The composite insulation composed of the two will age under long-term thermal stress. To investigate the charge transport characteristics of XLPE/SIR composite insulation with different ageing degrees, XLPE/SIR samples with different ageing degrees were prepared and subjected to simultaneous measurement of space charge and isothermal relaxation current. At the same time, by combining Fourier transform infrared spectroscopy (FTIR) testing and quantum chemical computation (QCC), an energy band model of XLPE/SIR system before and after ageing was constructed, and the charge transport behavior of XLPE/SIR was explored. The results show that negative charges always accumulate at the XLPE/SIR interface, and the amount of charge increases with ageing time. There are always homopolar charges accumulating near the cathode and anode, and the distribution range decreases with ageing time. After ageing, the depth of charge traps in SIR does not change much, while deeper charge traps appear in XLPE. The negative charge accumulation at the interface between the unaged XLPE/SIR is mainly caused by Maxwell-Wagner polarization, while the increase of negative charge accumulation at the interface of the aged samples is mainly related to the introduction of shallow electron traps in SIR and deep electron traps in XLPE.
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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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