13
4. Panel design and equipment
4.1 Switchgear construction features
UniGear 500R is a medium voltage switchgear for
indoor applications with metal enclosure. Each cubicle
is divided into the following segregated compartments
(Figure 23)(Figure 24):
A: Low voltage compartment
B: Busbar compartment
C: Circuit-breaker and cable compartment
D: Gas duct channel
According to IEC 62271-200 Standard, the switchgear
is classified LSC2-PM.
In IEC version, the switchgear is provided with a
pressure relief duct, fitted on the roof of the
switchgear (see par. 4.3.4.). The cubicles are all
factory-wired. Installation only requires external power
and auxiliary connections and the wiring between the
various sections.
The switchgear features a single busbar system and
one circuit-breaker compartment per cubicle. Each
circuit-breaker compartment is equipped with a
removable circuit-breaker.
WARNING
Before performing any maintenance and
replacement of spare parts, take care to
deenergise the switchgear.
4.2 Internal arc clasification
UniGear 500R switchgear is guaranteed to withstand
an internal arc according to IEC 62271-200 Standard
(criteria 1 to 5) and ENA 41-36 (for ENA version only).
Accessibility to the switchgear varies according to the
type of intervention and the version.
Internal arc classification
IEC version (IAC AFLR)
All the operations (normal service operations,
maintenance, replacement of spare parts) can be
performed either from the switchgear front or rear
(unless the switchgear is not installed against the
wall).
Figure 23: Example of IEC version panel.
ENA version (IAC AF)
Normal operations are performed from the switchgear
front only. Maintenance and replacement of spare
parts can be performed either from the switchgear
front or rear (only when switchgear is deenergised).
Note:
To enable effective relief of internal arc gasses, the
switchgear must be mounted at a minimum distance of
600 mm from the rear wall.
Figure 24: Example of ENA version panel.
To Next Page
Loading...
