Siemens NXPLUS C Installation And Operating Instructions Manual page 131

Checking the voltage
transformer connection
802-9081.9 • INSTALLATION AND OPERATING INSTRUCTIONS • NXPLUS C • Revision 11
➭ Lead the secondary leads of the instrument transformers into the low-voltage
compartment, and connect them.
Observe the phase sequence!
Fig. 96: Cable routing into the low-voltage compartment
➭ Connect the earthing cable of the end adapters/cross adapters.
Fig. 97: Circuit diagram for checking
the voltage transformer
connection
➭ On one panel of the switchgear, switch the circuit-breaker and the three-position switch to
CLOSED position.
➭ Connect a voltmeter to the outgoing cable of the voltage transformer and set the mV-range.
➭ Apply 15 to 20 V DC to L1, L2, L3 to earth with the battery and observe the voltmeter.
✔ If the pointer moves a little bit, the voltage transformer connection is in good order.
① Secondary leads
②
Vertical wiring duct
(only for secondary leads with
steel tube)
Cutout
③
① Voltage transformer
② Plug connector
③ Busbar
④ Three-position switch
⑤ Circuit-breaker
⑥ Battery box (15 – 20 V)
Installation
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