7
Type VFI, Fluid-insulated Switchgear
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
MN285006EN March 2018
3.
Perform the following inspectionse:
●
Check fluid level
– refer to the
Fuid fill guidelines
in
this manual if fluid levels are low.
otee:
N
When the switchgear is installed on a level
surface, the ball float in the fluid level indicator
sight gauge on the front plate will be at the top
of the site glass when fluid temperatures are
68 ºF (20 ºC) or higher. Colder temperatures
and/or an uneven pad will result in the gauge
indicating less than maximum fluid levels.
●
Inspect tank cover
– the tank cover should be free of
chipped paint and corrosion. If a crack or hole is found,
obtain a fluid sample and check moisture content and
dielectric strength immediately. If a replacement cover
or cover gasket is needed, refer to the
Replacement
parts
section of this manual.
●
Inspect tank exterior for fluid leaks
– there should
be no fluid staining on or near the tank seals at the
bushings, visible break windows and other gasketed
seals on the front plates. If fluid stains are present,
check the fluid level, and see the
Fuid fill guidelines
if more fluid is required. Bushing leaks may be sealed
by re-applying torque to the bushing clamp hardware
(5 to 6 ft-lbs). Do NOT tighten visible break window
hardware. First check for cracks in the window. If
found, order replacement window kit. If no cracks,
tighten hardware (95 to 105 in-lbs).
●
Check bushing and elbow conditions
– elbow
connections should be secure and free from
unusual wear. Record abnormalities and contact the
manufacturer with any concerns.
●
Inspect tank and cabinets for corrosion or unusual
signs of wear
– contact the manufacturer with any
concerns.
●
Functionality check
– verify that cabinet doors close
and lock properly. Verify manual operation of each
switch and VFI. Contact the manufacturer with any
concerns.
●
Record any other unusual wear/abnormalities
–
contact the manufacturer with any concerns.
Internal inspection and repair
If internal damage is suspected or if the switchgear must
be opened for inspection, the following procedure is
recommended.
1.
De-energize and ground switchgear .
2.
Draw a fluid sample .
Use the drain plug with sampler
at the bottom of the tank. If moisture is found in the
tank, refill with clean, dry insulating fluid.
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
3.
Clean off tank cover .
Take appropriate precautions
to keep dirt, moisture, and other foreign matter from
entering tank and contaminating the insulating fluid.
4.
Remove tank cover .
5.
Inspect for internal damage .
Check inside the
switchgear for broken leads or loose parts. If any
bushings or interrupters are damaged, repair as
required.
6.
Bushing repairs .
The bushings can be changed with
the tank cover removed.
A. Lower the fluid level as needed to make repairs.
Store the drained fluid according to locally approved
procedures and in a sealed, clean and dry container.
B. Disconnect the internal cables and leads.
C. Unbolt external steel clamps from the front plate
and replace any damaged bushings or bushing
wells with new parts and a new gasket. Be sure to
position gasket so it will seal properly
7.
Interrupter repairs .
Contact your local Eaton
representative for additional information and ordering
procedures.
8.
Replace the tank cover .
New gaskets should be used
when re-installing the cover. Refer to the
section of
this manual for further instructions.
9.
Refill with insulating fluid .
Refer to the
Fluid
sampling guidelines
and
Fluid testing
sections of this
manual, and make sure that the unit is properly filled to
the 68 °F (20 °C) fluid fill level with clean, dry insulating
fluid.
10.
Close and lock doors .
After repairs are completed,
close and lock switchgear doors in order to prevent
unauthorized access and accidental contact with high
voltage lines.
Insulating fluid maintenance
WARNING
This equipment relies on dielectric fluid to provide
electrical insulation between components . The dielec-
tric strength and moisture content of the fluid must be
checked on a regular basis, as part of the routine main-
tenance inspection, to ensure that it is at or above mini-
mum 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
