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P: Fachverband Plasmaphysik

P 9: Atmospheric Pressure Plasmas II

P 9.2: Vortrag

Dienstag, 6. März 2018, 14:30–14:45, A 0.112

Decomposition of Gaseous Dielectrics in Gas Insulated Switchgears (GIS) and Lines (GIL) — •Thomas Hammer, Martin Ise, Robert Fleck, Florian Kessler, Thomas Rettenmaier, and Wiebke Sarfert-Gast — Siemens AG, Corporate Technology, Erlangen

Currently substantial efforts are taken to develop climate friendly gaseous dielectrics having the potential for substituting SF₆ in gas insulated medium voltage and high voltage equipment. Recently 3M^TM Novec^TM 5110 Insulating Gas (heptafluoro-3-(trifluoromethyl)-2-butanone: C5-FK) and 3M^TM Novec^TM 4710 Insulating Gas (tetrafluoro-2-(trifluoromethyl)propane-nitrile: C4-FN) buffered with air like compounds such as N₂ and CO₂ were suggested for GIS application. Both partial discharges (PD) and switching arcs may irreversibly decompose these compounds. Thus laboratory experiments simulating the lifetime exposure of C5-FK and C4-FN mixtures with N₂ and CO₂ to PD and arcs were performed. Major decomposition products analyzed by means of GC/MS were CF₄, C₂F₆, C₃F₈, C₃F₆, and C₃HF₇. Less than 1% of the initial amounts of the dielectric fluids were decomposed. Specific energies of arc decomposition were around 250 kJ/mol for C4-FN/N₂, 193 kJ/mol for C4-FN/CO₂, and around 100 kJ/mol for C5-FK/N₂. Specific energies of PD decomposition were six times larger.

The authors gratefully acknowledge support of this work by the German Federal Ministry for Economic Affairs and Energy (Funding Code 03ET7551).