Parameter: Term. 1,3,5,7 in dir. of obj.
•
Default setting (_:2311:116) Term. 1,3,5,7 in dir. of obj. = yes
With the Term. 1,3,5,7 in dir. of obj. parameter, you define the direction of the current. If you set
the parameter Term. 1,3,5,7 in dir. of obj. = yes, the direction of the current to the protected
object is defined as
forward
.
Parameter: Magnitude correction
•
Default setting (_:3841:103) Magnitude correction = 1.000
When using the Magnitude correction parameter, you adjust the magnitude (magnitude correction) for
the current input. This allows you to correct the tolerances of the primary current transformer phase-selec-
tively. The magnitude correction may be required for highly precise measurements. Use a comparison meas-
urement to determine the setting value (for example, with a high-precision measuring-voltage transformer). If
a primary correction is not necessary, retain the default setting.
NOTE
The Magnitude correction parameter has nothing to do with the internal adjustment of the input
circuit.
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.
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 Figure 6-3).
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.
6.1.6
Protection and Automation Functions
6.1 Power-System Data
SIPROTEC 5, Overcurrent Protection, Manual 307
C53000-G5040-C017-8, Edition 07.2017
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