Wet Snow Flashover Characteristics of 500-kV AC Insulator Strings with Different Arrangements

Applied Sciences. 2019;9(5):930 DOI 10.3390/app9050930

 

Journal Homepage

Journal Title: Applied Sciences

ISSN: 2076-3417 (Print)

Publisher: MDPI AG

LCC Subject Category: Technology: Engineering (General). Civil engineering (General) | Science: Biology (General) | Science: Physics | Science: Chemistry

Country of publisher: Switzerland

Language of fulltext: English

Full-text formats available: PDF, HTML

 

AUTHORS

Jingwei Xu (Engineering Laboratory of Power Equipment Reliability in Complicated Coastal Environment, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China)
Fanghui Yin (Engineering Laboratory of Power Equipment Reliability in Complicated Coastal Environment, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China)
Longji Li (Electric Power Research Institute of State Grid Tianjin Electric Power Company, Tianjin 300000, China)
Qingfeng Wen (Electric Power Research Institute of State Grid Tianjin Electric Power Company, Tianjin 300000, China)
Hao Wang (Electric Power Research Institute of State Grid Tianjin Electric Power Company, Tianjin 300000, China)
Shunnan Liu (Engineering Laboratory of Power Equipment Reliability in Complicated Coastal Environment, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China)
Zhidong Jia (Engineering Laboratory of Power Equipment Reliability in Complicated Coastal Environment, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China)
Masoud Farzaneh (Department of Applied Sciences, Université du Québec à Chicoutimi, Chicoutimi, QC G7H 2B1, Canada)

EDITORIAL INFORMATION

Blind peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 11 weeks

 

Abstract | Full Text

In order to study the wet snow flashover characteristics of 500-kV AC insulator strings under different arrangements, wet snow flashover tests were carried out in the large climate chamber of China Electric Power Research Institute (CEPRI). The wet snow flashover voltages were obtained by the even-rising method and the flashovers were filmed by a camera. The test results showed that the installation of an anti-icing shed of large diameter could increase the wet snow flashover voltage. The distance between the two insulators was a key parameter that influenced the discharge process and the flashover voltage. Under Λ-string arrangement, for common insulators, the flashover performance of iced insulators increased with the connection angle; for anti-icing insulators, the flashover performance increased at first and then decreased with the connection angle. In wet snow conditions, when the connection angle was at the commonly adopted angle of 60°, the flashover performance of the common insulators under the V-string and Λ-string arrangements was almost the same. For anti-icing insulators, however, the V-string arrangement was recommended according to the tests. The results obtained in this study can provide a reference for external insulation design in wet snow conditions.