Siemens Siprotec 7VK61 Manual page 168

Functions
2.9 Auxiliary Functions
This requires the three voltage inputs phase-to-earth to be connected. The zero-sequence voltage U
the voltage between the delta center and earth.
If the device features a synchronism and voltage check function, the characteristic values (voltages, frequen-
cies, differences) can be read out.
The power and operating values upon delivery are set such that power in line direction is positive, active com-
ponents in line direction and inductive reactive components in line direction are positive. The same applies for
the power factor cosϕ. It is occasionally desired to define the power draw from the line (e.g. as seen from the
consumer) positively. Using parameter address 1107 P,Q sign the signs for these components can be invert-
ed.
The computation of the operational measured values is also executed during an existent system fault in inter-
vals of approx. 0.5s.
Table 2-8
Measured Values
I ; I ; I Phase currents
L1 L2 L3
3I - calculated Earth current
0
3I - measured Earth current
0
Positive and negative sequence compo-
I1, I2
nent of currents
U , U , U Phase-to-earth voltages
L1-E L2-E L3-E
U , U , U Phase-to-phase voltages
L1-L2 L2-L3 L3-L1
3U Displacement Voltage
0
U Zero-sequence voltage
0
U , U Positive and negative sequence compo-
1 2
nent of voltages
U Voltage at measuring input U
X
S, P, Q Apparent, active and reactive power
f Frequency
cos ϕ
Power factor
U , U , U Line voltage, busbar voltage and
sy1 sy2 diff
voltage difference (for synchronism
check)
f , f , f Line voltage, busbar frequency and
sy1 sy2 diff
voltage difference (for synchronism
check)
ϕ
Amount of phase angle difference
diff
between line and busbar (for synchro-
nism check)
1)
according to address 1104
2)
according to address 1103
3)
considering factor 221 I4/Iph CT
The computation of the operational measured values is also executed during an existent system fault in inter-
vals of approx. 0.5s.
168
Operational measured values of the local device
4
primary second- % referred to
ary
A A Rated operational current
A A Rated operational current
A A Rated operational current
A A Rated operational current
Operational rated voltage / √3
kV V
kV V Operational rated voltage
Operational rated voltage / √3
kV V
Operational rated voltage / √3
kV V
Operational rated voltage / √3
kV V
Operational rated voltage / √3
kV V
√3 · U
MVA, —
MW, quantities
MVAR
Hz Hz Nominal Frequency
(abs) (abs) —
kV — —
Hz — —
°
— —
C53000-G1176-C159-3, Release date 05.2009
indicates
0
1)
1)
3)1)
1)
2)
2)
2)
2)
2)
2)
· I nominal operating
N N
1)2)
SIPROTEC, 7VK61, Manual