AC flashover performance of different shed configurations of composite insulators under fan‐shaped non‐uniform pollution. Issue 3 (1st September 2018)

• Record Type: Journal Article
• Authors: Zhang, Zhijin; Qiao, Xinhan; Zhang, Yi; Tian, Liang; Zhang, Dongdong; Jiang, Xingliang
• Is Part Of: High voltage. Volume 3:Issue 3(2018)
• Page Start: 199
• Page End: 206
• Publication Date: 2018-09-01
• Subjects: insulator testing -- composite insulators -- flashover -- porcelain insulators -- wind power -- power transmission; composite insulator -- porcelain insulators -- glass insulators -- AC flashover performance -- shed configurations -- fan‐shaped nonuniform pollution -- transmission lines -- unidirectional wind landform -- artificial pollution tests -- flashover voltage -- salt deposit density -- creepage distance utilisation rate; High voltages -- Periodicals; 621.3191
• DOI: 10.1049/hve.2018.0002
• Languages: English
• ISSNs: 2397-7264

Abstract

Abstract : Currently, it is founded that under unidirectional wind and certain landform, composite insulators are always fan‐shaped non‐uniformly polluted. In this paper, artificial pollution tests on three types of composite insulators with different shed configurations and under various fan‐shaped non‐uniform pollution conditions were carried out. Then the flashover performances of composite insulators, porcelain insulators and glass insulators were compared. Results indicate that there is a big difference between ac flashover performance of composite insulators under non‐uninform pollution and uninform pollution. The flashover voltage of composite insulator is largely influenced by salt deposit density (SDD), the ratio of SDD of windward side to leeward side (W/L), the occupation ratio of leeward side k and the shed configurations. The relationship between SDD and U50 still meets negative power function when composite insulator is fan‐shaped non‐uninform polluted. There is a reduction of 17.8–27.6% in the flashover strength when the ratio W/L of SDD decreases from 1/1 to 1/15. The shed configurations of composite insulators have great effects on the flashover performance. Composite insulators always have better withstand property compared to glass and porcelain insulators under either uniform pollution or fan‐shaped non‐uniform pollution.