ABB PVS980-CS, Руководство по оборудованию

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8. Check that the MV transformer is dead (high voltage terminals, low voltage terminals,
any auxiliary power, and instrumentation). Use an appropriate high voltage tester only
for the high voltage side, and a voltage detector with suitable testing heads for the low
voltage side.
9. Issue a work permit.
Disconnecting the MV switchgear from power supply
To disconnect the MV switchgear from all possible power supplies (external, auxiliary, and
inverters as well as any parallel connection stations), follow the below steps:
1. Stop the string inverters outside the compact skid.
2. Open the DC disconnecting switches in each inverter unit and add warning notices. If
applicable, open the AC disconnecting switches in each inverter unit, lock and add
warning notices (applicable only when inverter includes the oF296 and +F253).
3. Open all fuse base switches of the inverter inputs, lock and add warning notices.
4. Open all auxiliary breakers, switches and fuses in the auxiliary service board, lock and
add warning notices.
5. Open the main circuit breaker in the auxiliary service transformer, lock and add warning
notices.
6. Set the inverter auxiliary power off (if applicable).
7. Turn the vacuum circuit breaker of the MV switchgear to open position. Lock and add
warning notice.
8. Turn the disconnecting switch of the MV transformer side of the MV switchgear to open
position. Lock and add a warning notice.
9. Disconnect the MV switchgear from the MV network (all possible external power supplies,
grid and parallel stations). See the User's manual of the MV switchgear. Lock and add
warning notices.
Earthing the MV switchgear and AC cabinet
1. Turn the earthing switches of the MV switchgear to “earthed” position, lock (remove the
MV switchgear Ronnis key of the V module) and add warning notices.
2. If the compact skid is connected to parallel skids, make sure that you also turn the
appropriate earthing switches of the parallel skids to “earthed” position.
3. Temporarily, ground the MV switchgear terminals at all possible external power supplies
(grid and parallel skids). See the User's manual of the MV switchgear. Lock and add
warning notices.
4. Ground the inverter AC sides with appropriate temporary grounding set.
￭ Safety instructions for the Inverter area
WARNING!
Perform the below instructions before you start working on the inverters. Ignoring
the instructions can cause physical injury or death, or damage to the equipment.
You must be a qualified electrician to do installation and service work.
1.
Identify the inverter and read its safety instructions. See PVS980 central inverters
hardware manual ( 3AXD50000026013 [EN]).
2. Clearly identify the work location. Make sure that there is an escape route in case of an
emergency.
12 Safety instructions
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