PDF
Full
Outline
Converter transformer is the key equipment in high-voltage direct current (HVDC) transmission system, and its valve-side windings are subjected to complex composite voltage waveforms during operation. The existing researches primarily focus on partial discharge characteristics under single voltage form or AC-DC composite voltages. However, due to the influence of power electronic devices such as converter valves, converter transformers also endure pulsating voltages. In this paper, the impact of positive polarity DC pulsating voltage on partial discharge of oil-paper insulation under actual operating conditions was studied, and the partial discharge characteristics of two typical oil-paper insulation defects, needle tips discharge in oil and surface discharges on oil-paper boards, were obtained under DC pulsating voltage. The results show that the DC component only changes the frequency and amplitude of partial discharge, and has same effect on the two types of defects. As the amplitude of the pulsating component increases, the discharge pulses of the two types of defects increase gradually, forming pulse clusters and exhibiting significant polarity effects. The pulse clusters for needle tips discharge in oil are concentrated on the rising edge, while those for surface discharges on oil-paper boards are concentrated on the falling edge.
PDF
154
73
| 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
