Abstract
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.
Highlights
Introduction to streamersDielectric liquids are widely used for insulation of high power equipment, such as transformers, since liquid insulation has good cooling properties, high electrical withstand strength, and recovers from an electrical discharge within short time [1]
The model is built on the assumption that electron avalanches occur in the liquid phase, and that these govern the propagation of 2nd mode, positive streamers [40]
With this formulation, electron multiplication is more dependent on the electric field, implying that the electron avalanches become shorter, are closer to the streamer heads, and grow faster where the field is strong, which is illustrated in figure 29 using values for n-hexane [61]
Summary
I Madshaven, P-O Åstrand , O L Hestad, S Ingebrigtsen, M Unge and O Hjortstam. Any further distribution of A simulation model for second mode positive streamers in dielectric liquids is presented. Initiation this work must maintain and propagation is modeled by an electron-avalanche mechanism and the Townsend–Meek criterion. Attribution to the author(s) and the title of 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, the inception voltage is relatively high. Parameter variations are included to investigate how the parameter values affect the model
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