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

TL;DR

This paper presents a simulation model for second mode positive streamers in dielectric liquids, using electron avalanches and the Townsend--Meek criterion to understand breakdown mechanisms in cyclohexane.

Contribution

The study introduces a novel simulation approach combining electron-avalanche mechanisms with the Townsend--Meek criterion for dielectric liquids, specifically modeling second mode streamer propagation.

Findings

Avalanche-driven breakdown is feasible in dielectric liquids.

Inception voltage for streamers is relatively high.

Parameter variations influence streamer propagation in the model.

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.