5
Type VFI, Fluid-insulated Switchgear
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
MN285006EN March 2018
NOTICE
The use of Envirotemp™ FR3™ dielectric fluid is
limited to a minimum operating temperature of 0 °C
(32 °F) . Failure to comply can result in equipment mis-
operation .
T374 .0
A. In new equipment, the insulating fluid must have
a minimum dielectric strength of 26 kV. If the
dielectric strength of the fluid is less than 26 kV,
process or replace the fluid to restore its dielectric
strength to an acceptable minimum level.
B. Refer to the
Fluid testing
section of this manual for
service recommendations based on the moisture
content of the fluid.
C. For additional information on fluid specifications
and tests, refer to Reference Data TD280022EN;
Reclosers, Sectionalizers, Switches and to the
Fluid
testing
procedures section of this manual.
3.
Check the nameplate ratings .
Make sure the ratings
on the switchgear nameplate are correct for the
planned installation.
WARNING
Falling equipment . Use the lifting lugs provided and
follow all locally approved safety practices when lifting
and mounting the equipment . Lift the unit smoothly
and do not allow the unit to shift . Improper lifting
can result in severe personal injury, death, and/or
equipment damage .
G106 .3
NOTICE
Equipment damage . Never place jacks, tackle or
other attachments under the unit for the purpose of
lifting . Failure to comply will result in damage to the
equipment .
T240 .0
4.
Mount switchgear on concrete pad .
A. The switchgear must be installed on a level concrete
pad or structure that has been designed to support
the size and weight of the unit.
B. The switchgear must be hoisted only by the
recessed lifting provisions provided at the four
corners of the tank. Suitable lifting straps must be
used to prevent damaging the switchgear housing.
WARNING
Hazardous voltage . Solidly ground all equipment . Failure
to comply can result in death, severe personal injury,
and equipment damage .
T223 .2
5.
Ground switchgear .
Switchgear must be adequately
grounded. Install a permanent, low-resistance ground
connection to the switchgear tank. Grounding
provisions are provided near the bottom of the tank.
6.
Make high-voltage line connections .
A. Prior to making connections, make sure that the
source-side and tap-side cable elbows are correctly
identified and that the switchgear unit is oriented
correctly for the installation. The source leads must
connect to the source bushings; tap leads must
connect to the tap bushings of the unit.
B. Refer to the operation one-line diagram located
inside the doors of the switchgear, and make only
those elbow connections shown. The voltage and
current ratings shown on the nameplate must be
correct for the planned installation.
C. All cables not in use must be properly isolated from
all other leads. Unused leads must be parked on
standoff insulators or properly grounded using an
elbow grounding kit.
IMPORTANT
Do not use the red shipping covers on unused bushings .
They are not designed for permanent use on energized
equipment .
D. All bushings not in use must be insulated with
properly rated isolation cap. It is also recommended
that bushing elbow studs be pre-installed for future
use. The studs must be torqued into place, and this
is best done before the equipment is energized.
WARNING
Hazardous voltage . Switchgear doors must be closed
and padlocked at all times when unattended . Failure to
comply can result in death, severe personal injury, and
equipment damage .
G168 .1
7.
Close the door and apply a padlock to secure the
switchgear from unauthorized access .
Operation
DANGER
Hazardous voltage . Contact with hazardous voltage will
cause death or severe personal injury . Follow all locally
approved safety procedures when working around high
and low voltage lines and equipment .
G103 .3
WARNING
Hazardous voltage . Never rely on the open position of
the operating handle or the contact position indicator;
it does not ensure that the line is de-energized . Follow
all locally approved safety practices . Failure to comply
can result in contact with high voltage, which will cause
death or severe personal injury .
G123 .1
