Experimental research on vacuum breakdown characteristics in a long gap under microsecond pulses

Autor:	Yu Zhang, Liang Zhao, Lei Zheng, Qiu Xudong, Bo Zeng, Jie Cheng, Jiang-cang Su, Rui Li
Rok vydání:	2020
Předmět:	010302 applied physics Materials science Field (physics) chemistry.chemical_element 01 natural sciences law.invention Microsecond Magazine chemistry law Aluminium 0103 physical sciences Electrode Breakdown voltage Electrical and Electronic Engineering Atomic physics Voltage Titanium
Zdroj:	IEEE Transactions on Dielectrics and Electrical Insulation. 27:700-707
ISSN:	1558-4135 1070-9878
Popis:	By conducting vacuum breakdown experiments under 30 μs pulses with a uniform field for gap separations d ranging from 2.5 to 5.5 cm, it is found that the dependence of the breakdown voltage U b on d obeys the total voltage effect (TVE) relation U b =Cda, where a ranges from 0.76 to 0.84. By fixing d as 3.5 mm, U b for stainless steel (304C), titanium (TC4), and aluminum (LY14) electrode materials are obtained, and it is found that U b (304C) b (TC4) b (LY14). Microscopic images of the electrode surfaces show the presence of melting traces coming from the opposite electrodes. By extending Farrall's model of vacuum breakdown under microsecond pulses, an expression for the power exponent of a in the TVE is derived as a=(5 − k)/6, where k is a parameter related to the uniformity of the field. In the experiments performed here, electrodes with the Bruce configuration are used, and k is close to 0. Therefore, a is close to 0.833, which agrees with the values of the power exponents found in the experiments.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ec076e7916b7cedf9d2aa4e7edb6f64b https://doi.org/10.1109/tdei.2020.008490 Zobrazit plný text záznamu