- Journal Article
Rights / licenseIn Copyright - Non-Commercial Use Permitted
We measure mixtures of SF6 and HFO1234ze(E) (C3H2F4) and determine the critical electric field strength (E/N)crit in a Pulsed Townsend experiment. HFO1234ze(E) is an environmentally friendly alternative to SF6 for electrical insulation, since contrary to SF6 its global warming potential is negligible. While SF6 is unsurpassed in its electron attachment efficiency of thermal electrons, HFO1234ze(E) appears to moderate electron energies very efficiently. The electron attachment, on the other hand, is much weaker. We find a positive synergism in SF6/HFO1234ze(E) mixtures in the sense that the mixture of both compounds has a higher electric field strength than each gas separately. A maximum (E/N)crit of 425 Td is reached for a mixture of 40% SF6 and 60% HFO1234ze(E). A mixture of 90% HFO1234ze(E) and 10% SF6 has a critical electric field of 360 Td, similar to pure SF6. We attribute this effect to the high efficiency of HFO1234ze(E) in moderating down the electron energies, which enhances electron attachment to SF6 and reduces electron impact ionization. Show more
Journal / seriesIEEE Transactions on Dielectrics and Electrical Insulation
Pages / Article No.
SubjectGas discharges; Gas insulation; SF6; Alternative gases
Organisational unit03869 - Franck, Christian / Franck, Christian
NotesErratum: Legend of Figure 1 (black squares) should be "breakdown in SF6/C3F6 "
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