40 MNS-SG Operation and Maintenance | Manual
To open the short circuiting device:
1.
Make sure that the current transformer secondary
circuits are complete. Do not open circuit the
secondary of an energized breaker.
2.
a) Single Ratio
–
Remove and store the shorting screw.
Do not remove the ground screw.
2. b) Multi Ratio
–
Remove the shorting screw.
Insert shorting screw according to connection
diagram. Do not remove the ground screw.
4.11.4.
Energize the switchgear
After completing all of the previous steps related to
installation and commissioning, energize the switchgear
following these steps:
1.
Apply power on the main incoming.
2.
Verify that the incoming phase sequence is correct.
3.
Switch on the main disconnect.
4.
Check the phase sequence of each unit.
5.
If existing, switch on any external power sources.
4.11.5.
Energize the main bus
After completing the control circuit checkout, energize the
switchgear main bus.
1.
Energize the incoming bus to the switchgear main
circuit breaker. Observe if operation of instruments
and relays is correct.
2.
Energize the separate control power source, if
furnished.
3.
Energize the switchgear main bus by closing the main
circuit breaker. Observe if operation of relays and
instruments is correct.
4.
If applicable, close feeders and tie circuit breakers.
5.
Verify that all door panel screws are tight.
6.
Rack all drawout-type circuit breakers to the
CONNECTED position.
4.11.6.
Final testing
Check that all instrumentation is working properly and the
readings are within specifications or reasonable levels.
Check that all instantaneous protections that were turned
down during previous testing are reset to their operating
positions.
5.
Component operation documents
Circuit breakers, relays and other components may have
documentation that describes operating instructions that
are not included in this manual. Review any documentation
provided with those components prior to operating the
switchgear.
Review the final project documents, manuals and other
documents that accompanied your switchgear regarding
operating procedures.
