Journal ArticleDOI
AC Corona and Breakdown Characteristics for Rod Gaps in Compressed Hydrogen, SF6 AND Hydrogen-SF6 Mixtures
Alan H. Cookson,Roy E. Wootton +1 more
TLDR
In this article, the ac corona onset and breakdown voltages have been measured for rod-plane and rod-rod gaps in hydrogen, SF6, and hydrogen-SF6 mixtures for pressures between 1 and 5 bar, with gaps up to 14 cm, and voltages up to 250 kV rms.Abstract:
The ac corona onset and breakdown voltages have been measured for rod-plane and rod-rod gaps in hydrogen, SF6, and hydrogen-SF6 mixtures for pressures between 1 and 5 bar, with gaps up to 14 cm, and voltages up to 250 kV rms. The addition to hydrogen of quantities of SF6 as low as 0.002% by volume resulted in a substantial increase in breakdown voltage of typically 70%. The corona onset voltage of the hydrogen was only increased by large additions of SF6 above 1%. With the mixtures for rod-rod gaps, breakdown values were obtained up to 70% higher than for SF6 alone, and there was no maximum in the breakdown voltage-pressure characteristic in contrast to the case for SF6. Very intense, stable glow currents of up to 20 mA were recorded. The characteristics and mechanisms of the various corona modes are discussed.read more
Citations
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Journal ArticleDOI
A Review of Electrical Breakdown in Mixtures of SF6 and Other Gases
Nazar H. Malik,A. H. Qureshi +1 more
TL;DR: In this article, the breakdown and pre-breakdown behavior of sulphur-hexafluoride (SF6) mixtures with other electron attaching and non-attaching gases is discussed.
Book ChapterDOI
Electric strength of some gases and gas mixtures
TL;DR: In this article, the authors report the results of experimental determinations of the 60 Hz electric strength in quasi-uniform fields of approximately thirty gases at 0.15 MPa.
Journal ArticleDOI
Static Field Breakdown of SF6-N2 Mixtures in Rod-Plane Gaps
TL;DR: In this article, the static field breakdown and corona characteristics of SF6-N2 mixtures in non-uniform field gaps for applied voltages of positive and negative polarities are discussed.
Journal ArticleDOI
Research status of replacement gases for SF6 in power industry
Shuangshuang Tian,Xiaoxing Zhang,Yann Cressault,Juntai Hu,Bo Wang,Song Xiao,Yi Li,Narjisse Kabbaj +7 more
TL;DR: In this paper, the current status and existing problems of SF6 are summarized, and the future development trend of alternative gas for SF6 in the electrical industry is proposed, as well as the existing research results of the natural gas, SF6 mixed gas, perfluorocarbons, and CnFmX gas are summarized.
Journal ArticleDOI
Impulse Breakdown Behavior of Negative Rod-Plane Gaps in SF6-N2, SF6-Air and SF6-C02 Mixtures
TL;DR: In this article, the breakdown behavior of a 50 mm negative rodplane gap is investigated for N2, air, CO2 and their binary mixtures with SF6 for pressures of up to 0.5 MPa using rod of 0.794 mm radius and impulse voltages of 2/50
References
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Journal ArticleDOI
Static field anode corona characteristics in sulphur hexafluoride
TL;DR: In this paper, the static field anode corona characteristics in SF 6 over a wide range of gas pressures and field non-uniformities were investigated and the theoretical streamer onset voltages of the various test gap geometry-pressure configurations were calculated and compared with the experimentally determined breakdown voltages and onset levels of various stages of prebreakdown current activity.
Journal ArticleDOI
Der elektrische Durchschlag verschiedener Gase unter hohem Druck
TL;DR: In this article, Uber Durchschlagmessungen in Stickstoff, Kohlendioxyd, Luft and Wasserstoff im homogenen Feld bis zu 2 cm Schlagweite, and im Feld konzentrischer Zylinder bis vereinhaltigt.
Journal ArticleDOI
Impulse breakdown of positive rod-plane gaps in hydrogen and hydrogen-SF 6 mixtures
TL;DR: In this paper, the negative rod-plane gaps in hydrogen and in H2/SF6 mixtures for pressures in the range 0.5-3.0 bar and electrode spacings up to 0.25m were measured.
Journal ArticleDOI
Some experiments on positive point-to-plane corona and spark breakdown of compressed gases
TL;DR: In this article, the electrical insulating properties of compressed air, nitrogen, dichlorodifluoromethane (commercially known as Freon 12 or Arcton 6) and sulphur hexafluoride, as well as certain mixtures of these gases, are compared; a hemispherically-tipped point-to-plane electrode configuration and direct voltages were used.
Journal ArticleDOI
Dielectric breakdown of sulphur hexafluoride
C. N. Works,T. W. Dakin +1 more
TL;DR: In this paper, the authors present some anomalies in the dielectric breakdown of sulphur hexafluoride as functions of pressure and electrode separation in a nonuniform field.
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