6
Type VFI, Fluid-insulated Switchgear
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
MN285006EN March 2018
WARNING
Do not operate this equipment if energized parts are not
immersed in dielectric fluid . Operation when parts are
not properly immersed in dielectric fluid may result in
internal flashovers that will damage the equipment and
can cause death or severe personal injury .
G104 .4
Application
This switchgear must only be applied within its specified
ratings. At no time should the continuous total load exceed
the ratings shown on the nameplate.
This switchgear must always be filled to the correct level
with mineral oil, Envirotemp™ E200 or Envirotemp™ FR3™
fluid.
Vacuum fault interrupters
The vacuum fault interrupter push/pull operating handles
(shown in
Figure 3
and
Figure 4
) are located on the
switchgear front plates. A hotstick must be used to operate
the handles of the vacuum fault interrupters.
WARNING
Hazardous Voltage . Always use a shotgun stick when
working with this equipment . Failure to do so could
result in contact with high voltage, which will cause
death or severe personal injury .
G108 .0
Opening interrupter
The vacuum fault interrupter is opened by pulling the
operating handle down to the open position. The handle
may be padlocked in the open position to prevent accidental
closure.
Resetting the vacuum fault interrupter
After the vacuum fault interrupter mechanism has tripped,
as the result of a fault condition, the mechanism must be
reset before it can be closed. To reset the mechanism,
firmly pull the operating handle down toward the ground
until the latch resets. After the latch has been successfully
reset, the vacuum fault interrupter mechanism can be
closed normally.
Closing the interrupter
The vacuum fault interrupter is closed by briskly pushing the
handle up, into the closed position.
otee:
N
In many configurations, a Type RVAC switch is
integrated within the VFI switchgear. Refer to the
Operation section of
MN285005EN Type RVAC Fluid-
Insulated Vacuum Switchgear; Installation, Operation,
and Maintenance Instructions
for operation
information for the RVAC switch.
Loadbreak switch
In most configurations, a Type RVAC loadbreak switch is
integrated within the VFI switchgear. The switch’s push-to-
close/ pull-to-open handle is operated with a clampstick.
The switch can be padlocked in either position, and a key
interlock is available for added security.
Maintenance information
WARNING
This equipment relies on dielectric fluid to provide
electrical insulation between components . The dielectric
strength and moisture content of the fluid must be
checked on a regular basis, as part of the routine
maintenance inspection, to ensure that it is at or
above minimum dielectric requirements and below the
maximum moisture content . Use of this equipment
with dielectric fluid that does not meet requirements
can result in internal flashovers that will damage the
equipment and can result in death or serious injury .
G107 .3
CAUTION
This equipment requires routine inspection and
maintenance to ensure proper operation . If it is not
maintained it can fail to operate properly . Improper
operation can cause equipment damage and possible
personal injury .
G105 .1
The Type VFI switchgear is a deadfront design. All live parts
are contained within the sealed tank enclosure. A routine
maintenance inspection program is required to ensure
proper operation.
It is necessary to establish and maintain a regular schedule
for sampling and testing the insulating fluid to ensure proper
dielectric strength, moisture content and fluid levels in the
switchgear.
Maintenance inspection procedure
The Type VFI switchgear must be de-energized, grounded,
and removed from service before conducting any
maintenance, fluid processing or fluid-filling procedures.
WARNING
Hazardous voltage . This equipment must be
de-energized and grounded prior to conducting any
maintenance, dielectric fluid processing or dielectric
fluid filling procedures . Failure to comply can result in
death or severe personal injury .
T239 .2
1.
De-energize and ground switchgear .
2.
Reduce internal tank pressure to 0 PSIG .
The
switchgear is equipped with a pressure relief valve
that opens at 5 PSIG and closes at 3 PSIG. To relieve
internal tank pressure, pull the ring on the pressure
relief valve.
