Jena 2013 – scientific programme

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P: Fachverband Plasmaphysik

P 4: Plasmatechnologie I

P 4.1: Invited Talk

Monday, February 25, 2013, 16:30–17:00, HS 2

An efficient procedure to identify and quantify new molecules for insulating gas mixtures — •Christian M. Franck, Dominik A. Dahl, and Mohamed Rabie — Institute for Power Systems and High Voltage Technology, ETH Zurich, Switzerland

In this contribution, a new program to systematically identify and quantify new gas molecules with low global warming potential for application in high voltage insulation as gas mixtures is presented. The main attention is on highly efficient procedures to be able to scan a large number of candidate gases.

To identify new molecules, an empirical correlation between the electric strength and certain molecular properties, like polarizability or dipole moment, which can be calculated by means of density functional theory (DFT) is derived. This correlation function is used to screen further gases from available molecule libraries. The electric strength of these pre-selected molecules in mixtures with buffer gases is then quantified using a newly set-up Pulsed Townsend (PT) experiment. In particular the transport coefficients, as well as attachment and ionization rates can be determined with high precision. The setup operates with a high degree of automation to enable systematic evaluation of different gas mixtures not to miss possible synergistic effects between buffer and attaching gas.