5.
After disconnecting the inverter, wait for at least five minutes to let the capacitors
discharge.
Disconnecting the MV switchgear (V-module)
To disconnect the MV switchgear (V-module), follow the below steps:
1.
Open the V-module breaker, lock and add warning notices.
2.
Set the disconnecting switch on the V-module to open position, lock and add warning
notices. See MV switchgear user's manual.
3.
Make sure that the V-module is dead: check that the voltage indicators in all V-module
bays (all phase LEDs) are switched off.
4.
Measure to confirm that the installation is not energized. Also, test the performance of
the voltage measurement device by measuring a live voltage.
5.
Make sure that the V-module is earthed. Turn the earthing switches to “earthed” position,
lock (remove the V-module key) and add warning notices. If the station is connected to
parallel stations, turn the applicable earthing switches to “earthed” position.
￭
Safety instructions for the auxiliary service board
1.
Open the main circuit breaker or main switch of the auxiliary service transformer. Lock
and tag.
2.
Open the secondary circuit breaker of the auxiliary service transformer. Lock and tag.
3.
Open all switches, breakers and connectors of the auxiliary service board. Lock and
tag.
4.
Make sure you are not near to any live parts while working. Disconnect the live circuits
or protect them with shrouds/screens.
5.
Check the status of the voltage indicators in the auxiliary service board.
6.
Check that the auxiliary service board is dead.
7.
Issue a work permit.
￭
Safe operation
WARNING!
Obey these instructions to prevent injury, death, or damage to the equipment.
WARNING!
Keep all doors locked while the compact skid is operating. Allow access to only
authorized personnel.
1.
Keep all doors of the compact skid closed during operation. Give the keys only to
authorized personnel.
2.
Before you start the inverter, close the following devices:
•
two AC and two DC main switches
•
auxiliary measurement unit switch 1F3.4
•
internal auxiliary MV transformer fuse switches
•
overload protection switches 1Q10, 1Q11, 2Q10 and 2Q11.
3.
Do not open the AC base fuse switches when the compact skid is operating.
4.
Before you adjust the group of inverters and set them into service, make sure that all
of them are suitable for operation.
14 Safety instructions
3
