Mechanism and influencing factors on critical pulse width of oil-immersed polymer insulators under short pulses
| Autor: | Lei Zheng, Bin Xiong Yu, Jian Cang Su, Xi Bo Zhang, Liang Zhao, Bo Zeng, Xiaolong Wu, Jie Cheng, Rui Li, Ya Feng Pan |
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| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Physics of Plasmas. 22:042113 |
| ISSN: | 1089-7674 1070-664X |
| Popis: | The critical pulse width (τc) is a pulse width at which the surface flashover threshold (Ef) is equal to the bulk breakdown threshold (EBD) for liquid-polymer composite insulation systems, which is discovered by Zhao et al. [Annual Report Conference on Electrical Insulation and Dielectric Phenomena (IEEE Dielectrics and Electrical Insulation Society, Shenzhen, China, 2013), Vol. 2, pp. 854–857]. In this paper, the mechanism of τc is interpreted in perspective of the threshold and the time delay (td) of surface flashover and bulk breakdown, respectively. It is found that two changes appear as the pulse width decreases which are responsible for the existence of τc: (1) EBD is lower than Ef; (2) td of bulk breakdown is shorter than td of surface flashover. In addition, factors which have influences on τc are investigated, such as the dielectric type, the insulation length, the dielectric thickness, the dielectrics configuration, the pulse number, and the liquid purity. These influences of factors are general... |
| Databáze: | OpenAIRE |
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