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During the operation of DC cable, the polarity reversal of voltage increases the space charge accumulated in the insulation, and it may damage the insulation . At the same time, the ionic charge generated by the dissociation of impurities such as cross-linking by-products introduced in the actual production process of insulating materials will aggravate the charge accumulation. Therefore, the traditional bipolar carrier transport model was improved in this paper. Considering the influence of impurity charged ions, the distribution of space charge in XLPE during the polarity reversal of voltage were simulated by using the improved transport model, and the influence mechanism of polarity reversal time and electric field intensity on charge distribution was studied. The results show that, on the basis of satisfying the mirror image distribution of space charge before and after the polarity reversal of voltage, the introduction of ionic charge increases the amount of heteropolar charge accumulated near the two electrodes in the steady state. Under the same polarity reversal time and different electric field intensity, the charge distribution law is basically the same, the higher the field strength, the more charge accumulates everywhere.
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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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