PDF
Full
Outline
To reduce the errors of the ageing state evaluation method based on the extended Debye model in describing the degradation process and explaining the ageing mechanism of oil-paper insulation, the polarization-depolarization (PDC) curves of oil-paper insulation samples with different ageing degrees were tested and analyzed in this paper. A distributed Debye model considering the relaxation branches with probability distribution was established, and an accurate evaluation method for the ageing state of oil-paper insulation bushing was finally proposed by solving through regularization method. The results show that with the increase of ageing degree, the polarization current overall shifts towards the direction of increasing the depolarization current and decreasing the relaxation time, and the time for the curve to reach a stable value is shortened. The distributed Debye model can effectively describe the multiple relaxation processes of the aged oil-paper insulation samples, and the regularization method can effectively solve the system ill-posed problems encountered when solving ill-conditioned linear equation. As the ageing degree increases, the probability density of the relaxation time distribution function corresponding to the main relaxation peak of sample increases, and the most probable relaxation time constant gradually decreases. The ageing state evaluation model constructed in this paper has high evaluation accuracy, whose error is less than 1.37%.
PDF
184
88
| 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
