Siemens SIPROTEC 7SC805, Руководство пользователя

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Functions
2.3 Additional Functions
SIPROTEC, 7SC805, Manual
C53000-G1140-C380-1, Release date 05.2014
43
Table 2-1 Legend for the conversion formulae(For 3-Phase Ratio)
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
A–B
and V
B–
C
and the displacement voltage V
N
.
The displacement voltage V
N
is either measured directly or calculated from the phase-to-ground voltages:
Please note that value V
0
is indicated in the operational measured values.
The ground current
I
N
is either measured directly or calculated from the conductor currents.
Upon delivery, the power and operating values are set in such manner that power in line direction is positive.
Active components in line direction and inductive reactive components in line direction are also positive. The
Measured values Secondary Primary %
I
A
,
I
B
,
I
C
,
I
1
,
I
2
I
sec.
I
N
= 3 ·
I
0
(calculated)
I
N sec.
I
N
= measured value
from the
I
N
input
I
N sec.
V
A
, V
B
, V
C
,
V
0
, V
1
, V
2
V
ph-n sec.
V
A–B
, V
B–C
, V
ph-ph
sec.C–A
V
ph-ph sec.
P, Q, S (P and Q
phase-segregated) No secondary measured values
Power factor (phase-
segregated) cos

cos

cos

· 100 in %
Frequency f in Hz f in Hz
Parameter Address Parameter Address
Vnom PRIMARY 202 Ignd-CT PRIM 217
Vnom SECONDARY 203 Ignd-CT SEC 218
CT PRIMARY 204 FullScaleVolt. 1101
CT SECONDARY 205 FullScaleCurr. 1101