PDF
Full
Outline
The insulation defects are likely to occur during operation of on-board transformers due to the harsh operating environment, resulting in the appearance of partial discharges and the degradation of oil-paper insulation, which might affect the safe and stable operation of trains. Therefore, according to the inter-turn insulation structure of on-board transformer, a three-layer oil-paper partial discharge model was designed by using aramid paper, and partial discharge simulation tests were carried out in lab. The partial discharge signal was recorded by partial discharge detector, and the dynamic change rate of discharge statistical parameters was proposed to characterize the development process of partial discharge. The results show that the discharge phase spectrograph of oil-immersed aramid insulating paper is symmetrically distributed, and the discharge magnitude rapidly increases to nC level after initial discharge. The discharge process of oil-immersed aramid insulating paper can be divided into four stages, including starting stages, development stages, dangerous stages, and breakdown stages according to the discharge phase spectrograph and dynamic change rate of discharge statistical parameters. Besides, the dynamic change rate of discharge repetition rate has an inflection point during discharge process, which can be used to evaluate the partial discharge development process of oil-immersed aramid insulating paper.
PDF
95
41
| 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
