Application And Setting Notes For Measuring Point Voltage 3-Phase (V-3Ph) - Siemens SIPROTEC 5 Manual

Power-System Data

5.6 Application and Setting Notes for Measuring Point Voltage 3-Phase (V-3ph)

5.6 Application and Setting Notes for Measuring Point Voltage 3-Phase
(V-3ph)
Settings for the supervision functions are also located in the voltage measuring point. You can find the
description of these settings in chapter Supervision Functions.
Parameter: Rated primary voltage
•
Default setting (_:8911:101) Rated primary voltage = 400.000 kV
The Rated primary voltage parameter is used to set the primary rated voltage of the voltage trans-
former.
If you change the setting of the parameter Rated primary voltage, for example, from 400.000 kV to
300.000 kV using the operation panel, restart the device to ensure that the change of the voltage transformer
ratios was accepted.
Parameter: Rated secondary voltage
•
Default setting (_:8911:102) Rated secondary voltage = 100 V
The Rated secondary voltage parameter is used to set the secondary rated voltage of the voltage trans-
former.
Parameter: Matching ratio Vph / VN
•
Default setting (_:8911:103) Matching ratio Vph / VN = 1.73
With the parameter Matching ratio Vph / VN, you set the deviation between the calculated zero-
sequence voltage and the residual voltage measured directly via a measuring input. The different transmission
ratio of the voltage transformers is the cause for the deviation (see
The Matching ratio Vph / VN is equal to the ratio 3V
with
V Calculated zero-sequence voltage
0 sec
V Measured residual voltage
N sec
The zero voltage is calculated as phase-to-ground voltages. The residual voltage is measured on the broken-
delta winding of the voltage transformer. For 1-phase voltage transformers, the residual voltage is measured
in the generator or the transformer neutral point.
NOTE
i
i
The measurement residual voltage V
118
/V
0 sec N sec
is converted to a zero-sequence voltage in the device as follows:
N sec
Figure 5-3).
SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017