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Installation
86/214
Revision 06 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DB10 • 864-5091.9
➭ 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.
Evacuating the busbar run
with the vacuum pump
Before filling SF
6
gas in, the air must be removed from the busbar run to be filled with gas
(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.
➭ 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.
Filling the busbar run
with an SF
6
gas cyclinder
➭ Determine the filling pressure required according to the rating plate
(see page 48, "Rating plates") and the data given in Section "Insulating gas SF
6
"
(see page 44, "Insulating gas SF
6
"). The pressure depends on the gas temperature.
➭ Connect the SF
6
gas cylinder to the gas filling valve of the evacuated busbar run.
➭ Fill SF
6
into the busbar run until the necessary pressure is reached. Check the filling 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 gas filling valve.
The gas filling valve closes automatically.
Fig. 86:
Gas pressure manometers and
gas filling valves at the switchgear front
①
Manometers of the SF
6
gas
compartments for busbars L1, L2, L3 of
busbar system 1
②
Manometers of the SF
6
gas
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