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C O M M I S S I O N I N G
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7 Commissioning
7.1 Preparatory work
To prepare for commissioning, the following work
must be carried out prior to the connection of
the high voltage power supply:
•
Check the general condition of the switchgear
for any damage or defects
•
Visually inspect the switching devices,
withdrawable parts, isolating contacts,
insulating parts, etc
•
Check the connection between the main
earthing bar and the installation earthing
conductor
•
Check the paintwork for damage and, where
necessary, touch up as described in section 8.5
•
Remove all residues of materials, foreign bodies
and tools from the switchgear
•
Clean the switchgear, rubbing down the
insulating parts with a soft, dry, clean, non-fraying
cloth. Remove any greasy or sticky dirt as
described in section 8.4
•
Correctly remount all covers etc. removed during
the assembly and testing procedures
•
Remove the transport caps on the vacuum
circuit-breakers if they are still fitted
•
Perform AC voltage testing of the main circuits
according to IEC 600271-200 where necessary.
Pay special attention to the voltage transformers
and cables, etc. during this procedure
•
Switch the auxiliary and control voltage on
•
Carry out testing operations on switching
devices manually or by electrical control, and
simultaneously observe the relative position
indicators
•
Check the mechanical and electrical interlocks
for effectiveness without using force
•
Set the protective devices in the switchgear
to the required values and check their function
with test equipment
•
For any other matters regarding operation of
the withdrawable circuit-breaker part and testing
facilities for the withdrawable part, please see
section 8.5
•
Instruct local operators regarding the basic
details in the regular handling of the switchgear
•
Check readiness for operation and the switching
status of electrical systems upstream and
downstream of the switchgear
•
Depending on the allocation of responsibilities,
it may also be necessary to check the following
equipment in areas adjacent to the switchgear:
-
Power cables
-
Auxiliary cables
-
Auxiliary power source
-
Remote control system
-
Complete earthing system
-
Switchroom equipment
-
Switchroom conditions
7.2 Start-up
•
Comply with all relevant safety regulations
•
Ensure that the circuit breakers in the system
are in the OFF position
•
Remove any existing earthing and short-circuiting
connections in the critical switching area
•
Energize the feeder cables
•
Connect the switchgear step by step, observing
the signals and indicators
•
Check that the relative conductors are in phase
and, where necessary, when there are several
incoming feeder cables and switchgear sections
•
Carry out all measurements and check the
functions which depend on the connection of
a high-voltage power supply
•
Watch out for irregularities of any kind
47
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