Applying Operating Voltage - Siemens NXPLUS C Installation And Operating Instructions Manual

Installation
Energizing incoming
feeders
Verifying correct
terminal-phase
connections
Preconditions
Performing the test
Checking further phases
Applying voltage to the
busbar
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20.8

Applying operating voltage

Hazardous voltage and internal arcing
Will cause death, serious injury or property damage.
Do not apply operating voltage before the following instructions have been executed:
➭ Observe the specifications for prevention of accidents.
➭ Observe the operating instructions and work instructions of the switchgear operator.
➭ Install the switchgear according to the installation instructions and drawings supplied.
➭ Perform electrical and mechanical and function test successfully.
➭ Instruct the operating personnel in theory and practice of switchgear operation.
➭ Fit all covers and bolt them tight.
➭ Switch all circuit-breakers and vacuum contactors to OPEN position.
➭ Switch the three-position switches in all panels to OPEN position.
➭ Earth feeders without connected cables. Close all bushings in a surge-proof way.
➭ Switch off connected consumers in all outgoing feeders.
➭ Short-circuit unused current transformers on the secondary side.
➭ Operate unused voltage transformers open on the secondary side.
➭ To assure a consistent phase sequence in the entire switchgear assembly, check the phase
sequence in all incoming and outgoing feeders before connecting them to the busbar.
➭ Energize all incoming feeders in the respective opposite substation.
Verify correct terminal-phase connections of all incoming feeders:
• Use the phase comparison test unit according to IEC 61243-5 or VDE 0682-415.
• The panel of the incoming feeder to be tested must be in the OPEN position.
• The opposite substation must be de-earthed and live.
➭ Remove the covers of the capacitive test sockets from phase L1 on the incoming feeder to
be tested and on an already energized incoming feeder.
✔ The plug-in sockets of the capacitive test sockets on phase L1 are accessible.
➭ Plug the measuring cables of the phase comparison test unit into the plug-in sockets of the
capacitive test sockets according to the operating instructions.
➭ Perform phase comparison according to the operating instructions of the phase comparison
test unit and read the indication.
➭ Remove the measuring cables from the plug-in sockets.
➭ Refit the covers of the capacitive test sockets on both incoming feeders.
➭ Perform phase comparison for the phases L2 and L3 in the same way.
✔ If the phase comparison test unit has shown coincidence on all 3 phases, the phase
sequence of the tested incoming feeder is correct.
✔ The incoming feeder can be energized.
If the phase sequence of all incoming feeders is correct, the incoming feeders can be
connected to the busbar:
➭ Close the three-position disconnector (the three-position disconnector must be operated in
no-load condition, see page 187, "Operation").
➭ Close the circuit-breaker or superior circuit-breaker.
✔ The busbar of the switchgear is live.
Revision 02 • INSTALLATION AND OPERATING INSTRUCTIONS • NXPLUS C • 806-9004.9
DANGER