MANDATORY SPARES
Operation & Maintenance Manual
10
Vacuuming Procedure:
Plug the unit into a suitable power supply, (see nameplate for
more information).
Make sure the equipment you will be evacuating does not
contain pressure.
Connect a mechanical Torr gauge or electronic vacuum
gauge to your equipment.
Turn valve V-6 (located on the exhaust port of the vacuum
compressor) into the EXHAUST position to allow the vacuum
compressor to exhaust to atmosphere.
Connect one end of the equipment hose to Valve -VB
(as shown in gure-1) of the Switchgear equipment to vacum
the breaker comportment. (use of a shutoff valve is
recommended).
Connect the other end of the equipment hose to the
EQUIPMENT CONNECTION on the operator panel.
Turn on the main circuit breaker and the vacuum compressor
power switch. The vacuum compressor will start.
Continue to evacuate until the equipment reaches the desired
vacuum that is the pressure is zero bar (approximately
10-6 bar) as shown in gure (Figure 2B).
After it reaches that level continue to vacuum for a minimum
of 15 minutes.
Note:
the total time for vacuuming will depend on the
number panel compartments to be vacuumed.
Close shutoff valve on equipment.
Disconnect the hose from EQUIPMENT CONNECTION on the
operator panel.
Turn valve V-6 into the RECOVER position and immediately
turn off the main circuit breaker.
Note:
Same procedure shall be followed to vacuum the busbar
and disconnector switch comportment by connecting the
equipment to the valve VBD of the switchgear (As shown in
gure 1).
VBD# :
For Plugin bushing arrangement the Valve VBD shall be
present in each feeder of the switchboard. The Vaccuming for
Busbar and Disconnector compartment shall be done through
separate VBD valves present in each panel.
Gas Filling:
Plug the unit into a suitable power supply.
Close all valves.
Make sure the vacuum compressor power switch is OFF.
Connect one end of equipment hose to the equipment being
charged. ( Connect to valve VB for
lling gas in VCB
compartment and connect to valve VBD for lling gas in
Busbar and DS compartment).
Turn valve V-1 to the Charge position, (up).
Turn valve V-2 to the Charge position, (down).
Open tank valve V-3. The Suction gauge should read
approximately 30-psig/2.0 bar.
If you are charging from an external tank, connect the tank to
V-5 on the operator panel.
Open the valve on the external tank, open V-5 and open V-4.
Set the regulator to the desired pressure (1.35 bar), viewable
on the EQUIPMENT gauge.
Connect the equipment hose to the EQUIPMENT
CONNECTION on the operator panel and open the valve to
the equipment. Note that as gas ows from the GFU10-XDS
into the equipment, the reading on the Regulated gauge
will drop.
Press the START button to turn on the compressor.
Monitor pressure at the equipment on locally mounted
gauge. Note that while charging is taking place, there may be
a difference between the readings of the local gauge and the
EQUIPMENT gauge.
Once the desired pressure 1.35 bar (As shown in Figure-2C)
has been reached, turn off the valve on the equipment.
Turn V-2 into the Recover position, (up).
Close tank valve V-3. Allow the Suction gauge reading to
drop to zero or into slight vacuum.
Turn panel valve V-1 into the Recover position. Allow the
Suction gauge reading to drop to zero or into slight
vacuum.
Turn off the compressor.
Close all valves.
Remove equipment hose from GFU10-XDS and equipment.
Zero the regulator for the next use.
Note:
As the equipment pressure increases, the discharge
pressure also rises. This happens because the compressor begins
to pump faster than gas is being transferred to the equipment. If
the GFU10 shuts down on high pressure, wait a few minutes for
ANNEXURE-A
