The influence of small amounts of N2 in SF6 on prebreakdown discharges

Nielsen, Shawn & Reynders, Jan (1999) The influence of small amounts of N2 in SF6 on prebreakdown discharges. In 11th International Symposium on High-Voltage Engineering (ISH 99), IEEE (Institute of Electrical and Electronics Engineers), London, UK, pp. 100-103.

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Abstract

Pre-breakdown discharge activity in SF6 and SF6 +2% N2 at 1 bar absolute has been investigated to assess the feasibility of adding small amounts of N2 to SF6 to improve the luminosity of the pre-breakdown discharges. It has been shown that small amounts of N2 does not significantly alter the breakdown strength of the mixture but will have a profound influence on the pre-breakdown discharge activity under 50 Hz voltages and lightning impulse voltages. This influence is attributed to the following three mechanisms: 1. The increased availability of free electrons due to the lower ionisation potential of the N2 compared to SF6 2. The removal of high energy electrons from the discharge by electron scattering due to negative ion resonance in N2, thus effectively increasing the attachment of SF6. 3. The creation of longer lived SF6- ions by the attachment of the scattered low energy electrons from N2 thus effectively enhancing the negative ion space charge.

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ID Code: 86675
Item Type: Conference Paper
Refereed: No
Additional Information: (Conf. Publ. No. 467)
Keywords: SF6, Discharge Activity, Luminosity, Partial Discharge
DOI: 10.1049/cp:19990709
ISBN: 9780852967195
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 1999 Please consult the author.
Deposited On: 20 Aug 2015 05:25
Last Modified: 23 Aug 2015 11:40

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