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
0 sec
/V
N sec
with
V
0 sec
Calculated zero-sequence voltage
V
N sec
Measured residual voltage
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.
i
i
NOTE
The measurement residual voltage V
N sec
is converted to a zero-sequence voltage in the device as follows:
5.6
Power-System Data
5.6 Application and Setting Notes for Measuring Point Voltage 3-Phase (V-3ph)
118
SIPROTEC 5, Fault Recorder, Manual
C53000-G5040-C018-5, Edition 11.2017
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