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Measurement of sparkover voltage and time lag characteristics in CF 3 I–N 2 and CF 3 I– air gas mixtures by using steep‐front square voltage
Author(s) -
Toyota Hiroyuki,
Matsuoka Shigeyasu,
Hidaka Kunihiko
Publication year - 2006
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.20325
Subject(s) - microsecond , voltage , rise time , analytical chemistry (journal) , overvoltage , square (algebra) , electrical engineering , dielectric , range (aeronautics) , dielectric strength , gas pressure , chemistry , materials science , mechanics , physics , optics , engineering , mathematics , composite material , geometry , chromatography , petroleum engineering
A square pulse voltage is useful for studying electrical discharge physics or very fast transient overvoltage issues. This paper describes sparkover voltages and time lag ( V – t ) characteristics of CF 3 I gas, which has very low environmental effects and high dielectric strength, and its mixtures with nitrogen gas or air in a very short time range below a microsecond. They are measured by using a steep‐front square voltage with a rise time of 16 ns and a peak value of 200 kV. Pure CF 3 I gas has 20% higher dielectric strength than SF 6 gas. The V – t characteristics of CF 3 I–N 2 or CF 3 I– air gas mixtures, which contain 60% CF 3 I gas, are equivalent to those of pure SF 6 gas at the same total pressure. A quantitative evaluation of V – t characteristics by the equal‐area criterion is also performed. The equal‐area parameter which is obtained by applying a voltage high enough to make the formative time lag dominant should be chosen. © 2006 Wiley Periodicals, Inc. Electr Eng Jpn, 157(2): 1–7, 2006; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20325