Siemens 8DB10 Installation And Operating Instructions Manual page 86

Installation
Evacuating the busbar run
with the vacuum pump
Filling the busbar run
with an SF gas cyclinder
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➭ Determine the size of the desiccant bags required for each busbar housing and
place the originally packed desiccant bags at the corresponding covers.
➭ Take the desiccant bags out of the packings and lay them completely into the associated
holder in the covers.
➭ Put the busbar covers with the bags into position. Observe that no part of the bags is
jammed in the contact surfaces in order to prevent leaks.
➭ Bolt the covers tight crosswise. Tightening torque: 20 Nm.
Before filling SF gas in, the air must be removed from the busbar run to be filled with gas
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(evacuation). One of the covers next to the right and left end panel of the switchgear contains
the pressure indicators and gas filling valves for all busbar runs.
Evacuating a five-panel busbar run takes about 30 to 40 minutes.
Fig. 86: Gas pressure manometers and
gas filling valves at the switchgear front
➭ Undo the locking cap of the gas filling valve ② for the completely closed busbar run.
➭ Connect the vacuum pump to the valve of the busbar run ② . Use short tubes with
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 valve in the gas filling valve closes automatically.
➭ Determine the filling pressure required according to the rating plate
(see page 48, "Rating plates") and the data given in Section "Insulating gas SF
(see page 44, "Insulating gas SF
➭ Connect the SF gas cylinder to the gas filling valve of the evacuated busbar run.
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➭ Fill SF into the busbar run until the necessary pressure is reached. Check the filling pressure
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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 gas filling valve.
The gas filling valve closes automatically.
Revision 06 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DB10 • 864-5091.9
① Manometers of the SF
compartments for busbars L1, L2, L3 of
busbar system 1
②
Manometers of the SF
compartments for busbars L1, L2, L3 of
busbar system 2
③ Manometer for three-position
disconnector housing in busbar system 2
④ Manometer for circuit-breaker housing
⑤
Manometer for three-position
disconnector housing in busbar system 1
"). The pressure depends on the gas temperature.
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gas
6
gas
6
"
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