Primary Injection Test; Applying Operating Voltage (High Voltage) - Siemens NXPLUS C Installation And Operating Instructions Manual

Performing the test
Applying voltage to the
busbar
Verifying correct
terminal-phase
connections
802-9074.9 • INSTALLATION AND OPERATING INSTRUCTIONS • NXPLUS C Wind • Revision 05
17.6

Primary injection test

If requested by the customer's specifications, a primary injection test can be performed on the
panels.
To test the current transformers, switch the three-position switch of the panel to be tested to
EARTHED position and the circuit-breaker to CLOSED position.
After that, the test current is applied through the bushings of the cable connection against the
earthing busbar by means of a suitable test unit. Power supply can take place via one or three
phases.
After applying the test current, the secondary measuring devices and tripping systems can be
tested.
17.7

Applying operating voltage (high voltage)

DANGER!
Mortal danger due to live parts.
Observe the Five Safety Rules of Electrical Engineering.

Observe the specifications for prevention of accidents.

Observe the operating and working instructions of the switchgear owner.

The operating personnel must have been trained, the installation work checked and test
operation must have been carried out successfully without malfunctions.
Close all covers.

Open all circuit-breakers.

On all panels, switch the three-position switch to OPEN position. If there is a feeder without

connected cables, earth this feeder. Additionally, all bushings must be protected in a surge-
proof way.
Ensure that all consumers connected to all outgoing feeders are switched off.

Ensure that all current transformers not in operation are short-circuited.

Operational voltage (high voltage) can be applied and the switchgear can be put into
r
operation as described hereafter:
Switch on incoming feeders in the respective opposite substation.

Connect one incoming feeder to the busbar, observing no-load operation of the three-

position switch.
Now the busbar of the switchgear is live.
r
If the busbar is to be interconnected with further incoming feeders, a phase comparison with
the already energized incoming feeder must be performed before energizing the new
incoming feeder.
Verify correct terminal-phase connections of the next incoming feeder and switch on the
incoming feeder:
DANGER!
Short-circuit in case of different phase sequence of the incoming feeders.
Make sure that all incoming feeders have the same phase sequence.

To check the phase sequence, use only phase comparison test units which are adequate

for the LRM interface (capacitive test sockets).
Switch on tested incoming feeder.

Installation
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