Premium
Comparisons of direct‐current breakdown characteristics in dry air and SF 6 gaps using a parallel‐plane arrangement with variable height protrusion
Author(s) -
Nishijima Kiyoto,
Tsuneyasu Itaru
Publication year - 1992
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.4391120705
Subject(s) - breakdown voltage , corona (planetary geology) , corona discharge , air gap (plumbing) , voltage , electrode , electric field , materials science , direct current , mechanics , plane (geometry) , atmospheric pressure , electrical engineering , composite material , physics , geometry , engineering , mathematics , meteorology , quantum mechanics , astrobiology , venus
Breakdown voltages in uniform and quasi‐uniform field gaps are sensitive to the presence of small protrusion on the electrode surface in SF 6 at high pressures. The aim of the present work is to study direct breakdown and corona stabilized breakdown for the transitive region from uniform to nonuniform gap in dry air and SF 6 at low pressures up to a critical pressure when direct breakdown takes place by a leader discharge crossing the gap in SF 6 . In a parallel‐plane gap with a variable‐height protrusion subjected to the dc voltage, corona onset voltage is remarkably controlled by the protrusion height. The present electrode arrangement has the advantage of directly measuring the minimum critical guiding field strength for the propagation of a streamer discharge at corona onset. The experimental observations have been explained qualitatively on the basis of a streamer model and precise electric field calculations of gap.