Modeling streamers in transformer oil: The transitional fast 3rd mode streamer
Name
Hwang-2009-Modeling streamers in transformer oil The transitional fast 3rd mode streamer.pdf
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1.79 MB
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Author(s)
Hwang, J. George
Zahn, Markus
Pettersson, Leif A. A.
Hjortstam, Olof
Liu, Rongsheng
Date Issued
September 2009
Journal
IEEE 9th International Conference on the Properties and Applications of Dielectric Materials, 2009. ICPADM 2009.
Publisher
Institute of Electrical and Electronics Engineers
Citation
Hwang, J.G. et al. “Modeling streamers in transformer oil: The transitional fast 3rd mode streamer.” Properties and Applications of Dielectric Materials, 2009. ICPADM 2009. IEEE 9th International Conference on the. 2009. 573-578. © 2009 IEEE
Version
Final published version
Abstract
This paper presents an electro-thermal hydrodynamic model that explains the development of different streamer modes in transformer oil. The focus is on the difference between the slow 2nd and fast 3rd mode streamers discussed in the literature. Through the use of numerical methods the model demonstrates that streamer modes arise in transformer oil due to the electric field dependent molecular ionization of different families of hydrocarbon molecules (i.e., aromatic, naphthenic, and paraffinic) at increasing electric field levels (or applied voltages). Ionization of the low number density aromatic molecules, that generally have lower ionization energies than naphthenic/paraffinic molecules, leads to the propagation of 2nd mode streamers with velocities on the order of 1 km/s. As the applied voltage is increased, the ionization of the main hydrocarbon molecules in transformer oil, high number density naphthenic/paraffinic molecules, dominates producing high electric field levels and space charge at the streamer tip. This ultimately leads to the propagation of the 3rd mode streamer with velocities on the order of 10 km/s.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Laboratory for Electromagnetic and Electronic Systems
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
http://dx.doi.org/10.1109/ICPADM.2009.5252362
