ABB
7
Uniswitch Operation and
Maintenance Manual
UNIS14GB 05-02
3 Design and construction
3.1 Construction of the switchgear and main components
General In the design of the Uniswitch cubicle, special attention has been paid to
increased reliability of use and improved personnel safety in the possible
event of an arc-fault. The following improvements have been made:
• The exterior parts of the cubicle are made from 2 mm aluminum-zinc
coated steel plates, and they are joined together with screws.
In order to improve personnel safety and maintainability, the cubicles are
divided into separate compartments. The compartments are designed so
that they withstand the very rapid rise in temperature and pressure
caused by a possible arc-fault condition.
3.2 Cubicle design and equipment
3.2.1 Compartments of fixed type switchgear
Figure 3.1
Compartments in fixed type switchgear.
Compartments The cubicle is divided into the following compartments (see Figure 3.1):
1) Busbar compartment
The air-insulated busbar compartment is situated in the top of the
cubicle and usually runs through the whole switchgear. A measuring or
sectionalising cubicle situated in the middle of the switchgear divides the
main busbar compartment.
The busbar compartment requires tools for opening. It is designated a
“tool-based accessible compartment”.
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