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I draw these for work!
I’m no engineer but SF6 works really well as an insulator to allow the circuit breaker to break the circuit in a smaller piece of equipment.
I believe the long canister below the bushings holds the SF6 and the part that breaks the circuit. I believe it is a shaft that pretty much explosively retracts in a split second to break the circuit when activated.
Again. I’m just a drafter (wannabe designer) and all I do is place these in physical drawings for substation construction. I could easily be understanding things wrong.