Siemens 8DA Installation Instructions Manual page 32

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Evacuating the busbar run
with the vacuum pump
32
ATTENTION!
In the ambient air, the desiccant bags lose their effectiveness rapidly and cannot be
used anymore.
!
Use only desiccant bags whose packing is not damaged and whose humidity
indicators in the packing are blue.
!
Do not use desiccant bags if the humidity indicators are pink.
!
After opening the packings, mount the desiccant bags in the gas compartment
within 30 minutes and close the gas compartment hermetically.
!
Remove all covers with the "Filter" inscription from the housings of one busbar run.
!
Clean busbar housings that are dirty inside with a hand vacuum cleaner. In this case,
clean the bushing plates too with a humid rag. To moisten the rag, use water
containing a common household cleaner. Then dry the bushings with a lint-free cloth.
!
Prepare the flanges of the busbar housings for installation (see Page 21, "Preparing
busbar assembly").
!
Clean the sealing surfaces of the busbar housing covers with a lint-free paper, and
apply a thin film of grease.
!
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 cover with the bags into position, observing that no part of the bags
is jammed in the sealing 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
6
gas (evacuation). One of the metal covers next to the right and left end panel of the
switchgear contains the pressure indicators and maintenance valves for all busbar runs.
Evacuating a five-panel busbar run takes about 30 to 40 minutes.
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