IG-183-EN version 06; 31/03/2020
40
Recommended sequence of operations
General instructions
cgm
.3 system: medium voltage SF
6
gas-insulated
cubicles up to 38 kV according to IEEE and CSA standards
5.2. Operating levers
For safety reasons, maintenance operations performed
directly on the driving mechanism must be performed
WITHOUT any actuating lever inserted.
The
cgm
.3 system cubicles are operated with 3 different
types of lever, depending on the type of driving mechanism
used.
5.2.1. Lever for B, BR-A, AV and RAV driving mechanisms
This is an anti-reflex lever for performing closing (I)
and opening (O) operations in the switch/disconnector
respectively, without exceeding the medium voltage
cubicle’s maneuvering limits.
This type of lever prevents the opposite operation being
carried out immediately after opening or closing the switch.
Figure 5.2.
B/BM Driving mechanism lever
5.2.2. Spring charging lever for
cgm
.3-v
The spring charging lever is used to manually charge the
springs in the circuit breaker driving mechanism.
Figure 5.3.
Spring charged lever for
cgm
.3-v
cubicle
