PDF
Full
Outline
In order to investigate the effects of degassing treatment on the electrical tree growth and discharge evolution in DC cable insulation, and to clarify the affecting mechanism of degassing treatment in the critical breakdown process of electrical tree, taking cross-linked polyethylene (XLPE) samples with different degassing time as research objects, on the basis of partial discharge (PD) experiment data, the dynamic evolution processes of electrical tree growth rate and discharge magnitude were quantified by combining derivative analysis and adaptive threshold method, and the critical breakdown characteristics were identified by counting mutation point. The results show that degassing treatment can significantly delay electrical tree growth, reduce discharge activity, and increase the breakdown threshold. In short-time degassed samples, charges tend to accumulate more rapidly and trigger electrical tree expansion immediately, and the electrical tree growth and the discharge evolution are synchronous. However, when degassing is sufficient, the processes of trap capturing charges and energy accumulation become more prominent, and the discharge shows significant lag in driving electrical tree propagation, and drives the rapid evolution close to breakdown through phased accumulation–release mode. The proposed analytical method can effectively improve the identification accuracy of breakdown point, providing a theoretical basis for the insulation optimization and health monitoring of DC cables.
PDF
63
36
| 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 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
