Velatia Ormazabal cgm.3, Руководство по эксплуатации

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Safety locking facilities and interlocking Operation instructions
cgm. 3
ENA type
IG-235-EN version 02
3 Safety locking facilities and interlocking
3.1 Mechanical interlocking
cgm. 3 ENA type switchgear incorporates safety
mechanical locking required to ensure the following
conditions:
The switch-disconnector and the earthing switch cannot
both be in closed position at the same time.
The switchgears have a safety interlock which prevents
access to the medium voltage cable compartment while the
earthing switch is not closed. In normal operation, this
earthing switch cannot be opened if the cable compartment
access cover is not in place.
The circuit breaker must be open firstly to open the switch -
disconnector, however the switch - disconnector can be
closed independently, except at "EF" units.
3.2 Safety locking facilities
3.2.1 Locking with a padlock
The switchgears are supplied with an independent padlock
interlock for both the switch-disconnector, in its closed or
open positions, and the earthing switch, in its closed or
open positions. Padlocks with ring diameters of between 4
and 7 mm can be used.
Fig. 3.1: Interlocking in
cgm. 3-l
switchgear using padlock
and keys
3.2.2 Locking with a key lock (optional)
Both the switch-disconnector and the earthing switches
can have an optional locking interlock device, which allows
its operation to be key-locking in both the open and closed
positions.
Fig. 3.2: Interlocking in cgm. 3-l switchgear using keys