Siemens 8DA Installation Instructions Manual page 35

Replacing desiccant bags
in the circuit-breaker hous-
ings
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!
Repeat the above work operations for all other panel connections in the same panel.
The desiccant bags are located behind the cover of the rupture diaphragm at the side of
the circuit-breaker housing. The cover has the inscription "Filter".
Fig. 25: Cover of rupture diaphragm on circuit-breaker
housing
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 the lateral cover of the rupture diaphragm with the "Filter" inscription on
one circuit-breaker housing.
!
Unpack two new desiccant bags of 250 g each per pole, and put them completely
into the holder.
!
Prepare the housing flange for assembly (see Section "Preparing the flanges of the
busbar housings", Page 24).
!
Clean the contact surfaces of the cover of the rupture diaphragm with a lint-free
paper, and apply a thin film of grease.
!
Put the cover of the rupture diaphragm with the bags into position, observing 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.
!
Repeat the above work operations for all circuit-breaker housings on the same panel
where the desiccant bags must also be fitted.
!
After completing the replacement of desiccant agent in the panel, evacuate the
circuit-breaker housings and fill them with SF
a
Cover of rupture diaphragm
-gas (see below).
6
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35