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Influence of molecular additives on positive streamer propagation in ester liquids

Influence of molecular additives on positive streamer propagation in ester liquids

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Sammendrag
Molecular additives i.e. additives with specific molelcular propertie, has been shown to influence breakdown properties of dielectric liquids, in particular lightning impulse characteristics. In this study we investigate the propagation of streamers in a natural ester liquid with and without molecular additives in a needle plane electrode configuration with a 5 mm gap. In order to study streamer propagation, including fast events, in such a small gap, impulse voltages with 20-40 ns rise times are used. One molecular additive, dimethylaniline, has a low ionization potential and another, azobenzene, a low 1st excitation energy in comparison with the natural ester. Both additives increase the acceleration voltage with approximately 40% at a concentration of 5 w%. Different processes may be involved in the breakdown event for the different additives, which is indicated by differences in the breakdown voltage data.
Språk
Engelsk
Forfatter(e)
Institusjon(er)
  • Sverige
  • Diverse norske bedrifter og organisasjoner
  • SINTEF Energi AS / Elkraftteknologi
År
2014
Publisert i
Proceedings of IEEE International Conference on Dielectric Liquids
ISSN
2153-3725
Forlag
Curran Associates, Inc.
Bok
2014 IEEE 18th International Conference on Dielectric Liquids ICDL
Hefte nr.
2014
ISBN
9781479920655