Impulse breakdown of a point/plane gap in mixtures of SF 6 with selected buffer gases (air, CO 2 and N 2 ) has been studied. It has been found that the minimum impulse breakdown voltage of these SF 6 mixtures can be higher than or comparable with that of pure SF 6 . This finding is discussed in terms of the change of ion mobility and ionization energy in the mixtures. Some degree of immunity from the breakdown initiated by filamentary conducting particles in the system was observed using the mixtures.

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