Siemens 8DA Installation Instructions Manual page 33

Filling the busbar run with
an SF -gas cyclinder
6
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Fig. 23: Pressure indicators and maintenance valves at
the switchgear front
!
Undo the locking cap of the maintenance valve
run.
!
Connect the vacuum pump to the valve of the busbar run
the largest inside diameter possible.
!
Evacuate the housings down to a pressure of less than 2 kPa. Manometer indication:
-100 kPa. Measure the pressure with the vacuum pump locked.
!
Depending on the inside diameter and length of the vacuum pump tube, let the
pump operate for another 5 to 15 minutes.
!
Remove the pump tube. The maintenance valve closes automatically.
!
Determine the filling pressure required according to the rating plate and the data
given in Section "Technical data" (see "Description" 14.4, Page 22). The pressure
depends on the gas temperature.
!
Connect the SF -gas cylinder to the maintenance valve of the evacuated busbar run.
6
!
Fill SF into the busbar run until the necessary pressure is reached. Check the filling
6
pressure on the pressure indicator of the busbar run and on the pressure indicator of
the gas filling equipment.
!
Remove the connecting tube of the gas cylinder from the maintenance valve. The
maintenance valve closes automatically.
!
Refit the locking cap of the maintenance valve.
a Pressure indicator for busbar housings
(number according to design of busbar sys-
tem)
s
Gas filling socket for busbar housings (num-
ber according to design of busbar system)
d
Pressure indicator for circuit-breaker hou-
sing
f
Gas filling socket for circuit-breaker housing
s
for the completely closed busbar
s
. Use short tubes with
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33