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4.1.1 Enclosure and partitioning
The enclosure and internal partitions of
UniGear ZS2 are made of 2 mm thick high quality
Aluminium Zinc coated steel sheets. Three high
voltage compartments (viz: busbar compartment,
circuit breaker compartment and cable
compartment) are equipped with top mounted
pressure relief flaps fixed with steel bolts on one
longitudinal side and breakable nylon bolt on the
other side. These pressure relief flaps open; when
over pressure happens in an event of any internal
arc fault. Pressure relief flaps are made of sheet
steel with wire mesh or plain sheet steel
according to the rated branch conductor current.
The circuit breaker compartment door is of
pressure resistant design for internal arc fault
and is also padlockable. It is provided with
security glass for inspection purposes which is
also tested for Internal arc. Sidewalls of each
switchgear serve as partition between adjacent
switchgears.
Please refer table below for cable and Busbars
access in FRCB & Cassette type structures
Access for
FRCB
Structure
Cable compartment
Rear
Busbar compartment
Rear & Top
The low voltage compartment for secondary
equipment is completely protected from the high
voltage area.
Compartmentalization is made by the following
internal partitioning: (Refer Fig. 14)
•
The rear wall of the busbars compartment
•
Intermediate wall between cable and circuit
breaker
•
Mounting plate with metallic shutters
•
Horizontal partition
The internal partitioning makes safe access to
circuit breaker and cable compartments possible
even when bus bars are live (LSC2B-PM).
End covers at lateral sides ensure good
appearance and are arc fault proof both
mechanically and thermally, in the event of an
internal arc fault at end switchgears.
Doors, end covers and rear covers are made of
high quality steel sheets, which undergo
thorough cleaning through 7 tank process before
powder coating. The finishing coat is of standard
RAL 7035 color shade. (Special color shades on
request and by mutual agreement).
The circuit breaker compartment and cable
connection compartment doors are pressure
resistant and has manual closing system or can
be fitted with screws respectively.
4.1.1.1 Ventilation of the switchgears
Ventilation is ensured in the switchgear through
pressure relief flaps, which offers IP4X degree of
protection. For use of UniGear ZS2 switchgear for
ambient temperatures above 40°C systems,
additional ventilation system is to be provided.
4.2. Compartments in UniGearZS2
4.2.1 Busbar Compartment
The busbar compartment has three copper
busbars of tubular cross-section laid in sections
Cassette
Structure
between switchgears. They are held in place by
Front & Rear
tubular branch conductors. Diameter and
thickness of busbars vary according to the
Rear & Top
current rating.
Busbars and branch conductors are insulated and
connections are shrouded.
—
Figure 15A - Busbar compartment top view without top sheet
—
Figure 15B - Interpanel Busbar assembly
11
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