Performing The Power- Frequency Voltage Test - Siemens NXPLUS C Installation And Operating Instructions Manual

Installation
Preparing the power-
frequency voltage test
Performing the power-
frequency voltage test
Completing the power-
frequency voltage test
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17.5

Performing the power- frequency voltage test

If required, a test with rated short-duration power-frequency withstand voltage can be
performed on site. The busbar voltage transformers are designed for a repeat test at 80% U
and 50 Hz according to IEC 62271-200.
At the factory, the individual feeders are routine-tested by means of a rated short-duration
power-frequency voltage test.
As a rule, the test with these high power-frequency voltage test levels is performed before
connecting the cables. If the cables are already connected, power-frequency voltage test
equipment with a very high rating is necessary, and the permissible test voltage of the
connected cables would be exceeded.
For detailed information about cable tests, see page 166, "Cable testing".
ATTENTION!
The voltage indicators CAPDIS-S1+ and CAPDIS-S2+, LRM, VOIS+, VOIS R+, WEGA 1.2 and WEGA
2.2 may be damaged if test voltage is applied.
Short-circuit the voltage indicators with the earthing points of the test sockets.

Fig. 116: Short-circuit plug, make Kries,
order number 2500029
Switch the circuit-breaker and the three-position switch of the incoming feeder to CLOSED

position to perform the power-frequency voltage test.
Switch all other three-position switches to EARTHED position.

If required, remove high voltage cables from the panel to be tested.

Apply the power-frequency test voltage in a surge-proof way at the cable connection

bushing via test cables.
Short-circuit the capacitive voltage detecting system.

Now you can carry out the test.
r
Earth adjacent phases.

Test phases L1, L2 and L3 consecutively for 60 seconds with the rated short-duration power-

frequency voltage.
Undo short-circuit on the capacitive voltage detecting system.

Remove the test cable.

Undo earthing of the adjacent phases.

If required, connect high-voltage cables again.

Revision 05 • INSTALLATION AND OPERATING INSTRUCTIONS • NXPLUS C Wind • 802-9074.9
Fig. 117: Short-circuit plug, make Horstmann,
order number 51-9904-001
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