Simulation model for the propagation of second mode streamers in dielectric liquids using the Townsend-Meek criterion

A simulation model for second mode positive streamers in dielectric liquids is presented. Initiation and propagation is modeled by an electron-avalanche mechanism and the Townsend–Meek criterion. The electric breakdown is simulated in a point-plane gap, using cyclohexane as a model liquid. Electrons...

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Bibliographic Details
Main Authors: Madshaven, Inge, Åstrand, Per-Olof, Hestad, Øystein, Ingebrigtsen, Stian, Unge, Mikael, Hjortstam, Olof
Format: Article
Language:English
Online Access:Request full text
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Summary:A simulation model for second mode positive streamers in dielectric liquids is presented. Initiation and propagation is modeled by an electron-avalanche mechanism and the Townsend–Meek criterion. The electric breakdown is simulated in a point-plane gap, using cyclohexane as a model liquid. Electrons move in a Laplacian electric field arising from the electrodes and streamer structure, and turn into electron avalanches in high-field regions. The Townsend–Meek criterion determines when an avalanche is regarded as a part of the streamer structure. The results show that an avalanche-driven breakdown is possible, however, the inception voltage is relatively high. Parameter variations are included to investigate how the parameter values affect the model.