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Functions
2.12 Auxiliary Functions
Applications
•
Information on the actual status of the system
•
Conversion of secondary values to primary values and percentages
Prerequisites
Except for secondary values, the device is able to indicate the primary values and percentages of the measured
values.
A precondition correct display of the primary and percentage values is the complete and correct entry of the
nominal values for the instrument transformers and the protected equipment as well as current and voltage
transformer ratios in the ground paths when configuring the device. The following table shows the formulas
which are the basis for the conversion of secondary values to primary values and percentages.
Measured values which cannot be calculated due to the selected voltage connection are shown as dots.
Display of Measured Values
2.12.3.1
Table 2-10
Measured
sekun-
Values
dary
V
, V
, V
,
V
A
B
C
Ph-N sec.
V
, V
, V
,
0
1
2
V
syn
V
, V
, V
V
A–B
B–C
C–A
Ph-Ph sec.
V
V
N
N sec.
V
V
x
x sec.
Frequency
f in Hz
Protection
Table 2-11
Parameter
Vnom PRIMARY
Vnom SECONDARY
Vph / Vdelta
FullScaleVolt.
Depending on the type of device ordered and the device connections, some of the operational measured
values listed below may not be available.
The phase–to–ground voltages are either measured directly, if the voltage inputs are connected phase–to–
ground, or they are calculated from the phase–to–phase voltages V
V
.
N
The displacement voltage V
[verlagerungsspannunguen-020315-wlk, 1, en_US]
106
Conversion formulae between secondary values and primary/percentage values
primary
f in Hz
Legende zu den Umrechnungsformeln
Adresse
202
203
206
1101
is either measured directly or calculated from the phase-to-ground voltages:
N
%
and V
and the displacement voltage
A–B
B–C
SIPROTEC 4, 7RW80, Manual
C53000-G1140-C233-4, Edition 07.2018
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