Enclosure And Partitioning; Ventilation Of The Cubicles - ABB Uniswitch Operation And Maintenance Manual

3.3 Enclosure and partitioning

Material
High-voltage
compartments

3.4 Ventilation of the cubicles

Ventilation openings
ABB
Uniswitc h Operation and
Maintenanc e Manual
The enclosure and internal partitions of the cubicles are made of 2 mm
thick high-quality aluminum-zinc coated steel sheet.
Doors and end plates are thoroughly cleaned and treated against
corrosion before receiving a high-quality coating of paint. The finishing
coat is in the standard RAL 7035 colour (special colours by agreement).
The doors of the cable compartments are pressure resistant and are
equipped with inspection windows.
The low-voltage compartment for secondary equipment is completely
protected from the high-voltage area, thanks to its steel-sheet partition.
The two high-voltage compartments (busbar compartment, circuit-
breaker & cable connection compartment) are equipped with inspection
windows. Neighbouring cubicles are partitioned from one another by the
side walls of each cubicle.
The front of the cubicle is closed off by a pressure-resistant removable
door. The door of the high-voltage compartment is pressure resistant.
On the end cubicle sides, cover plates ensure good appearance and are
mechanically and thermally arc fault-proof (should such an event occur
in the end cubicle).
Figure 3.7
Removable ventilated top element of the withdrawable type cubicle.
Openings in the outer enclosure are needed for the purpose of
ventilation in the case of 1250 A -rated currents in the busbars and
branch bars. The ventilation openings are located on the back wall and
on the top of the withdrawable type cubicle.
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UNI S14GB 05-02