S&C Instruction Sheet 766-540 9
Figure 3. Opening and closing the interrupters with a hookstick.
Ready position
Interrupters
open and are
mechanically
blocked from
closing
Momentary
command to
electrically
close
Operating Levers and Indicators
Figure 4. The interrupters locked open.
Figure 5. The 15.5-kV and 27-kV interrupter OPEN/CLOSED indicator, one at each pole.
Indicator showing
pole closed
Indicator showing
pole open
Figure 6. The 38-kV interrupter OPEN/CLOSED indicator, one at each pole.
Indicator showing
pole closed
Indicator showing
pole open
Interrupters open and
locked, mechanically
blocked from closing