General instructions
Safety elements
IG-136-EN version 10; 23/06/2016
64
cgm.3 system
Fully SF6 gas insulated medium voltage switchgear up to 40.5 kV in accordance with IEC Standards
6 Safety elements
6.1 Acoustic earthing prevention alarm
The ekor.sas acoustic alarm unit is associated to the
ekor.vpis voltage presence indicator and to the earth
shaft drive. The alarm is activated when there is voltage
in the functional unit's medium voltage feeder and the
lever is inserted in the earthing switch shaft. A sound then
indicates that a short-circuit or zero voltage may occur in
the network if the operation is carried out.
Operation of the unit is assured within the same operating
range as the ekor.vpis unit associated with it
[23]
.
Figure 6.1 ekor.sas unit
6.2 Interlocks
The switchgear is provided with safety locks, which ensure
the following conditions:
1. The switch-disconnector and the earthing switch
cannot both be in closed position at the same time.
2. The cubicles have a safety lock 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 cover is not in place.
[23]
Incompatible with use of ekor.ivds units.
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