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In order to study the influence of semi-conductive shielding materials on the charge transport behavior in insulation, we selected three different types of semi-conductive shielding materials made in and out of China to cooperate with the same insulation, and trial-produce a shield-insulation-shield sandwich structure sample by simulating the actual cable structure, and conducted high-field conductance tests and space charge measurements. The results show that the introduction of the shielding layer changes the conduction mode inside the insulation. Compared with the pure insulation sample, the charge injection of the insulation sample with shielding layer increases significantly. The insulation-shielding interface of the imported shielding material sample has a stronger ability to inhibit charge injection, and the charge injection degree is weaker. The measurement of the space charge of each sample shows the impact of charge injection on the degree of space charge accumulation inside the insulation, the space charge accumulation of the shielding material sample made in China is more serious, while that of the imported sample is lower. It is needed to concern the impedance mismatch problem caused by the particularity of the sample structure in the measurement of space charge.
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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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