Discharge Behavior and Morphological Characteristics of Suspended Water-Drop on Shed Edge during Rain Flashover of Polluted Large-Diameter Post Insulator
Rain is one of the dominant meteorological factors threatening the outdoor insulation performance of ultra-high voltage (UHV) power stations. Discharge occurring on the polluted surface of post insulators in rain has always been a major concern of power stations. Previous studies have shown that sus...
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/14/6/1652 |
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| author | Yifan Liao Qiao Wang Lin Yang Zhiqiang Kuang Yanpeng Hao Chuyan Zhang |
| author_facet | Yifan Liao Qiao Wang Lin Yang Zhiqiang Kuang Yanpeng Hao Chuyan Zhang |
| author_sort | Yifan Liao |
| collection | DOAJ |
| description | Rain is one of the dominant meteorological factors threatening the outdoor insulation performance of ultra-high voltage (UHV) power stations. Discharge occurring on the polluted surface of post insulators in rain has always been a major concern of power stations. Previous studies have shown that suspended water droplets on the shed edge play an important role in the rain flashover process. In this work, artificial contamination rain flashover tests were carried out in a laboratory on a UHV DC (Ultra-High Voltage Direct Current) large-diameter composite post insulator, which had a rod diameter of 625 mm and alternating sheds (105 mm and 75 mm for larger and smaller shed overhang, respectively). The discharge mechanism was analyzed base on the observation of discharge phenomenon of suspended water-drops on the shed edge. Moreover, simulation models by COMSOL Multiphysics were established to investigate the electric field around sheds and suspended water-drops, as well as the shape change of water droplets on the insulation surface, especially at the edge of the shed. Results show that the shape parameters of water-droplets changed continuously under the combined action of gravity, surface tension, and capillary tension. Suspended water-droplets on the shed edge showed a great influence on the electric field distribution, and the resulting discharge lead to the bridging between sheds. This work paves a new way to revealing the contamination rain flashover mechanism on post insulators and provides critical knowledge for power stations on preventing flashover accidents. |
| first_indexed | 2024-03-10T13:10:54Z |
| format | Article |
| id | doaj.art-78e4a8ff73844f28bdb1a1814b7d6aa0 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T13:10:54Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-78e4a8ff73844f28bdb1a1814b7d6aa02023-11-21T10:46:31ZengMDPI AGEnergies1996-10732021-03-01146165210.3390/en14061652Discharge Behavior and Morphological Characteristics of Suspended Water-Drop on Shed Edge during Rain Flashover of Polluted Large-Diameter Post InsulatorYifan Liao0Qiao Wang1Lin Yang2Zhiqiang Kuang3Yanpeng Hao4Chuyan Zhang5School of Electric Power, South China University of Technology, Guangzhou 510640, ChinaSchool of Information Engineering, China University of Geosciences (Beijing), Beijing 100083, ChinaSchool of Electric Power, South China University of Technology, Guangzhou 510640, ChinaSchool of Electric Power, South China University of Technology, Guangzhou 510640, ChinaSchool of Electric Power, South China University of Technology, Guangzhou 510640, ChinaSchool of Information Engineering, China University of Geosciences (Beijing), Beijing 100083, ChinaRain is one of the dominant meteorological factors threatening the outdoor insulation performance of ultra-high voltage (UHV) power stations. Discharge occurring on the polluted surface of post insulators in rain has always been a major concern of power stations. Previous studies have shown that suspended water droplets on the shed edge play an important role in the rain flashover process. In this work, artificial contamination rain flashover tests were carried out in a laboratory on a UHV DC (Ultra-High Voltage Direct Current) large-diameter composite post insulator, which had a rod diameter of 625 mm and alternating sheds (105 mm and 75 mm for larger and smaller shed overhang, respectively). The discharge mechanism was analyzed base on the observation of discharge phenomenon of suspended water-drops on the shed edge. Moreover, simulation models by COMSOL Multiphysics were established to investigate the electric field around sheds and suspended water-drops, as well as the shape change of water droplets on the insulation surface, especially at the edge of the shed. Results show that the shape parameters of water-droplets changed continuously under the combined action of gravity, surface tension, and capillary tension. Suspended water-droplets on the shed edge showed a great influence on the electric field distribution, and the resulting discharge lead to the bridging between sheds. This work paves a new way to revealing the contamination rain flashover mechanism on post insulators and provides critical knowledge for power stations on preventing flashover accidents.https://www.mdpi.com/1996-1073/14/6/1652contamination rain flashoverpower station post insulatordischarge behaviorsuspended water-drop |
| spellingShingle | Yifan Liao Qiao Wang Lin Yang Zhiqiang Kuang Yanpeng Hao Chuyan Zhang Discharge Behavior and Morphological Characteristics of Suspended Water-Drop on Shed Edge during Rain Flashover of Polluted Large-Diameter Post Insulator Energies contamination rain flashover power station post insulator discharge behavior suspended water-drop |
| title | Discharge Behavior and Morphological Characteristics of Suspended Water-Drop on Shed Edge during Rain Flashover of Polluted Large-Diameter Post Insulator |
| title_full | Discharge Behavior and Morphological Characteristics of Suspended Water-Drop on Shed Edge during Rain Flashover of Polluted Large-Diameter Post Insulator |
| title_fullStr | Discharge Behavior and Morphological Characteristics of Suspended Water-Drop on Shed Edge during Rain Flashover of Polluted Large-Diameter Post Insulator |
| title_full_unstemmed | Discharge Behavior and Morphological Characteristics of Suspended Water-Drop on Shed Edge during Rain Flashover of Polluted Large-Diameter Post Insulator |
| title_short | Discharge Behavior and Morphological Characteristics of Suspended Water-Drop on Shed Edge during Rain Flashover of Polluted Large-Diameter Post Insulator |
| title_sort | discharge behavior and morphological characteristics of suspended water drop on shed edge during rain flashover of polluted large diameter post insulator |
| topic | contamination rain flashover power station post insulator discharge behavior suspended water-drop |
| url | https://www.mdpi.com/1996-1073/14/6/1652 |
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