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PG&E Phases Out SF6 Greenhouse Gas | T&D World Air/Vacuum Pilot. In 2006 PG&E chose to evaluate dry air/vacuum technology as an alternative to SF 6 by first testing the technology in an inexpensive DTCB application. In 2009, the utility purchased a Hitachi 72-kV, 31-kA, 2000-A dry air/vacuum breakers for the pilot at …

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