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.
When using the connection types Vab, Vbc or Vab, Vbc, Vx of the voltage transformers (address 213 VT
Connect. 3ph), the measured values for power P, Q, S, power factor, energy and the derived values, such as
mean values etc. are not available.
Measured values which cannot be calculated due to the selected voltage connection are shown as dots.
Display of Measured Values
Table 2-21 Conversion formulae between secondary values and primary/percentage values
Measured
Values
sekun-
dary
primary %
Ι
A
, Ι
B
, Ι
C
,
Ι
1
, Ι
2
Ι
sec.
Ι
E
= 3 ·Ι
0
(calculated)
Ι
e sec.
Ι
N
= measured
value of Ι
N
-input
Ι
N sec.
Ι
Ns
(ΙNs,
Ι
3I0real
,
Ι
3I0reakctiv
)
Ι
Ns sec.
Ι
N2
= measured
value from the
Ι
E2
input
Ι
N2 sec.
V
A
, V
B
, V
C
,
V
0
, V
1
, V
2
,
V
syn
V
Ph-N sec.
V
A–B
, V
B–C
, V
C–A
V
Ph-Ph sec.
V
N
V
N sec.
V
x
V
x sec.
P, Q, S (P and Q
phase-segre-
gated)
No secondary measured values
Power Factor
(phase-segre-
gated)
cos φ cos φ cos φ · 100 in %
Frequency
Protection
f in Hz f in Hz
2.23.3.1
Functions
2.23 Auxiliary Functions
SIPROTEC 4, 7SJ80, Manual 289
E50417-G1140-C343-A8, Edition 12.2017
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