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P A N E L D E S I G N A N D E Q U I P M E N T
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3 Panel design and equipment
3.1 Basic structure and variants
The UniGear ZS1 panel uses insertion technology
for the incoming/outgoing feeder panel with a
vacuum circuit-breaker. Each UniGear panel
consists of three high-voltage compartments -
busbar, circuit-breaker and cable connection -
while a control cabinet houses the secondary
equipment. Apart from this, variants are possible
for all operating needs.
Figure 2 shows example of possible panel
configuration, including electrical equipment.
For busbar sectioning, two panels are necessary: a
coupling panel with the withdrawable circuit-
breaker part and a bus-riser panel (optional with
busbar metering and earthing).
Further details about installation and switchgear
equipment can be ordered from the manufacturer.
3.2 Enclosure and partitioning
A typical panel enclosure is made of 2 mm thick
high quality galvanized steel sheets. The internal
partitions consist of 2 mm thick high quality
galvanized steel or stainless steel sheets. The
materials used protect the panel against rust
and oxidation under adverse circumstances.
The three high-voltage compartments are
equipped with top-mounted and secured
pressure-relief flaps which are opened (by a
shockwave) to release the pressure and gas
buildup caused by an internal arc fault. The
pressure-relief flaps are secured with steel screws
on one longitudinal side and plastic screws on
the other side. The internal overpressure causes
the plastic screws to rupture.
The front of the panel is closed off by pressure
resistant doors. The cable and circuit-breaker
compartments have their own doors. Neighboring
panels are separated from one another by the side
walls of each panel, and an air cushion remains
between these walls when the panels are jointed
together.
Limiting, or even avoiding the end effects of an
internal arc fault is dependent on ceiling height,
and in individual situations, some special protection
measures are needed.
•
The mounting of a pressure relief duct on the
top of the switchgear, with further channels
leading out of the switchgear room in a form
appropriate to the design of the building. The
shock wave and arc discharge are channeled
off in ducts
•
A switchgear internal arc causes the air pressure
inside a compartment to rise. Meanwhile the
doors are closed and sealed, causing the high
air pressure to burst through the pressure
release plate and out through the top of the
switchgear
•
Steel plates are used to separate the low-and
high-voltage compartments
•
The switchgear end covers are designed not
only for aesthetic purposes but their mechanical
and electro-caloric properties provide good
protection when an internal fault arc occurs
7
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