Siemens 8DA10 Series Installation And Operating Instructions Manual page 102

Installation
Replacing desiccant bags
in the circuit-breaker
housings
Evacuating the circuit-
breaker housings with the
vacuum pump
102/214
The desiccant bags are located behind the bursting disc cover at the side of the circuit-breaker
housing. The cover has the inscription "Filter" ① .
Fig. 122: Bursting disc cover on circuit-breaker housing
In the ambient air, the desiccant bags lose their effectiveness rapidly
The formation of condensation can lead to corrosion of switchgear parts.
High air humidity can lead to creepage distances.
➭ If a gas compartment has been open for more than 30 minutes, replace all desiccant bags.
➭ Do not open the packing of the desiccant bags until right before putting them into the
panel.
➭ Use only desiccant bags whose packing is not damaged and whose humidity indicators in
the packing are blue.
➭ If the humidity indicators are pink, do not use the desiccant bags.
➭ If the desiccant bags have been exposed to the air for more than 30 minutes, do not use
the desiccant bags anymore.
➭ After opening the packings, mount the desiccant bags in the gas compartment within
30 minutes.
➭ Close the gas compartment hermetically with sealing rings (O-rings).
➭ Evacuate the gas compartment immediately.
➭ Remove the lateral bursting disc cover with the "Filter" inscription on one circuit-breaker
housing.
➭ Unpack 2 new desiccant bags of 250 g each per pole, and lay them completely into the
holder.
➭ Clean the sealing surfaces of the bursting disc cover with a lint-free paper, and apply a thin
film of Polylub GLY 801 mounting paste.
➭ Lay a new sealing ring (O-ring) into the groove of the bursting disc cover.
➭ Put the bursting disc covers with the inserted bags into position. Observe that no part of the
bags is jammed in the sealing surfaces in order to prevent leaks.
➭ Bolt the bursting disc 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
The circuit-breaker housings of one panel form a common gas compartment. Before filling SF
gas in, the air must be removed from the circuit-breaker housings (evacuation).
The manometer and the gas filling valve for the circuit-breaker housings of one panel are
located on the right side of the housing front.
Revision 11 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DA10 • 861-9601.9
WARNING
gas.
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