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Electrical tree is a common phenomenon in XLPE cable fault, and there may be voltage fluctuation during cable operation. However, there are few reports on the influence of voltage amplitude on the growth morphology and partial discharge characteristics after electrical tree is initiated. In this paper, the difference of growth morphology and partial discharge characteristics under different voltage amplitudes after electrical tree initiated was studied. The experimental results show that when the applied voltage is higher, the electrical tree morphology tends to develop into a cluster tree, and when the applied voltage is lower, the electrical tree morphology tends to develop into a dendritic tree or a single branched tree. The maximum partial discharge intensity test at higher voltage can be used to predict breakdown fault, but it is difficult to predict the growth of electrical tree at lower voltage through partial discharge intensity. The maximum discharge interval of electric tree becomes longer with the increase of voltage applied time, and the intermittent discharge is more obvious. The discharge interval of electric tree is closely related to the growth of electrical tree. The intermittent partial discharge occurs only when the growth of electrical tree is stagnant, and the partial discharge hardly stagnates when the electrical tree is growing.
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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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