S&C Vista - Operation; Manual Switch Operation Procedures

12 S&C Instruction Sheet 682-510
Operation
Figure 12� The window cover lifts for viewing of switch or
fault-interrupter blade positions�
Figure 10� The internal SF
6
-gas pressure gauge�
Manually Opening, Closing, or
Grounding a Way
WARNING
Do not operate this switchgear if the SF
6
-gas
pressure gauge is in the Red zone� Failure to follow
this precaution can result in a flashover, injury, and
equipment damage�
Make sure the insulating-gas pressure gauge is in the
Green zone (or the Green-and-Yellow striped zone) by lifting
the viewing window cover on way one. See Figures 10 and 11.
Note: If the SF
6
-gas pressure gauge is in the Green-and-
Yellow striped zone, the switch gear can be operated but
the tank must be repaired (if necessary) and relled with
SF
6
gas as soon as possible.
Note: If the Vista Green switchgear gas is in the
Green-and-Yellow striped zone, the switchgear
can be operated but must be serviced. Contact
S&C for assistance.
STEP 1� Open the viewing window cover and conrm
the position of the load-interrupter switch or the
three-pole fault interrupter by visually observing
the position of the blades. SeeFig ures12 and
13 on page 13.
Also, inspect the current-carrying components
inside the tank for any signs of abnormalities
but specifically for disconnect blade alignment,
contact finger position, and dislodged hardware.
WARNING
DO NOT operate the energized load interrupter
switch or fault interrupter if it has dislodged
hardware, or obvious signs of arcing or
blade misalignment� Failure to follow this
precaution can result in an injury or
equipment damage�
Figure 11� The internal gas-pressure gauge for Vista Green
switchgear models, “-GRN” catalog numbers�
OK TO
OPERATE
D
T
A
R
E
P
O
T
O
N
O
E
3
1
6
S
S
T
U
B
E
A
N
D
C
O
N
N
E
C
T
I
O
N
GAS
PRESSURE
CONFIRM OPERATE
CONTACT S&C