15
!
SAFETY
FOR LIFE
Initial Operation
With the sectionalizer connected into the system and the
source-side high-voltage lines energized, the sectional-
izer can be placed into service. Follow approved local
practices, which may involve closing the line disconnect
switches, closing the sectionalizer, and then opening the
bypass circuit.
Routine Operation
Under normal operating conditions, the sectionalizer
counts overcurrent interruptions of the backup protective
device and automatically opens if the counts registered
exceed the control setting. Once open, the sectionalizer
will remain open until manually closed. In addition, the
sectionalizer can be opened manually by one operation
of the yellow pullring of the manual trip rod.
To close the sectionalizer, after either a manual or auto-
matic trip, the gray manual-closing pullring must be oper-
ated approximately 10 to 12 times. (When the sectional-
izer closes, the resistance on the pullring is eliminated.)
This is the only means of closing the sectionalizer.
Automatic Return to Zero Count
A switch operated by the tripping linkage of the section-
alizer mechanism will automatically erase any accumu-
lated counts every time the sectionalizer opens either man-
ually or automatically.
One-Count-to-Open
As an added safety precaution during downline hot-line
work, the sectionalizer can be programmed for one-
count-to-open without opening the operator mechanism
housing and disturbing the normal operating settings.
The one-count-to-open lever overrides the COUNTS-
TO-OPEN SELECTOR switch to provide the capability
of opening the sectionalizer on the first overcurrent inter-
ruption. The hookstick-operated lever locks into position
when pulled down and must be manually reset.
CT PROTECTOR BOARD
Should the control be removed, the CT protector board,
shown in Figure 16, will automatically protect the current
sensing CTs. This is done by limiting the open-circuit
voltages to non-destructive levels.
15
S270-20-3
OPERATING INSTRUCTIONS
Figure 16.
Control Circuitry.
84577KMA
CT
Protector Board
Voltage
Charging Board
Heater
WARNING:
This equipment is not intended to
protect human life. Follow all locally approved
procedures and safety practices when installing or
operating this equipment. Failure to comply can result
in death, severe personal injury, and equipment dam-
age.
G102.1
!
WARNING:
Do not rely on the open position of
the yellow operating handle; it does not ensure
that the line has been de-energized. Always establish
a visible disconnect. Failure to follow proper safety
practices can result in contact with high voltage, which
will cause death or severe personal injury.
G116.0
!
WARNING:
Always use a hotstick when work-
ing with this equipment. Failure to do so could
result in contact with high voltage, which will cause
death or severe personal injury.
G108.1
!
