General Instructions
Operations sequence
56
cpg.1
Fully SF6 gas insulated single and double busbar GIS switchgears up to 36 kV in accordance
with IEC Standards
IG-137-EN version 03; 24/06/2016
7.7.3 Secondary busbar earthing
Initial conditions
: feeder disconnectors open,
earthing switches open and circuit breaker
open.
1. First, close the right-hand feeder disconnector.
Figure 7.59
Lever turn detail
2. Next, close the left-hand earthing switch.
Figure 7.60
Lever turn detail
3. The circuit breaker closes instantaneously on removal
of the driving lever.
Figure 7.61
Circuit breaker closed detail
To open the earthing connection, reverse the
sequence of operation: first
disconnect the circuit breaker by acting on the
bottom pushbutton,
then the earthing switches, and
finally disconnect the feeder
disconnectors.
The circuit breaker opening operation is always
performed manually.
Summary of Contents for Ormazabal cpg.1 Series
Page 67: ......
