Functions
2.26 Additional Functions
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
473
Table 2-21 Operational measured values of the local device
1)
according to address 1104
2)
according to address 1103
Measured Values Primary Secondary % Referred to
I
L1
; I
L2
; I
L3
Phase currents A A Nominal operational current
1)
I
EE
Sensitive earth current A mA Nominal operational current
3)1)
3I
0
Earth current A A Nominal operational current
1)
Ï•(I
L1
-I
L2
), Ï•(I
L2
-I
L3
),
Ï•(I
L3
-I
L1
)
Phase angle of the phase currents
towards each other
°– –
I
1
, I
2
Positive and negative sequence cur-
rents
A A Nominal operational current
1)
I
Y
, I
P
Transformer starpoint current or earth
current of the parallel line
A A Nominal operational current
3)1)
U
L1-L2
, U
L2-L3
, U
L3-L1
Phase-to-phase voltages kV V Nominal operational voltage
2)
U
L1-E
, U
L2-E
, U
L3-E
Phase-earth voltage kV V Nominal operational voltage / √3
2)
3U
0
Displacement voltage kV V Nominal operational voltage / √3
2)
Ï•(U
L1
-U
L2
), Ï•(U
L2
-U
L3
),
Ï•(U
L3
-U
L1
)
Phase angle of the phase voltages
towards each other
°– –
Ï•(U
L1
-I
L1
), Ï•(U
L2
-I
L2
),
Ï•(U
L3
-I
L3
)
Phase angle of the phase voltages
towards the phase currents
°– –
U
1
, U
2
Positive and negative sequence
component of the voltages
kV V Nominal operational voltage / √3
2)
U
X
; U
EN
Voltage at measuring input U
4
–V –
U
sy2
Voltage at measuring input U
4
kV V Operational rated voltage or
Operational rated voltage / √3
2)4)5)
U
1compound
Positive sequence component of volt-
ages at the remote end (if compound-
ing is active in voltage protection)
kV V Operational rated voltage / √3
2)
R
L1-E
, R
L2-E
,
R
L3-E
, R
L1-L2
,
R
L1-L2
, R
L3-L1
,
Operational resistance of all loops ΩΩ –
X
L1-E
, X
L2-E
,
X
L3-E
, X
L1-L2
,
X
L2-L3
, X
L3-L1
,
Operational reactance of all loops ΩΩ –
S, P, Q Apparent, active and reactive power MVA,
MW,
MVAR
– √3
·U
N
·I
N
Nominal operational
quantities
1)2)
cos ϕ Power factor (abs) (abs) –
f Frequency (constellation frequency) Hz Hz Nominal frequency
Θ
L1
/Θ
TRIP
, Θ
L2
/Θ
TRIP
,
Θ
L3
/Θ
TRIP
Thermal value of each phase,
referred to the tripping value
% – Trip overtemperature
Θ/Θ
TRIP
Resulting thermal value,
referred to the tripping value, calculat-
ed according to the set method
% – Trip overtemperature
U
sy1
, U
sy2
, U
diff
Measured voltage values
(for synchronsim check)
kV – –
f
sy1
, f
sy2
, f
diff
Measured frequency values
(for synchronism check)
Hz – –
Ï•
Diff
Amount of phase angle difference
between line and busbar
(for synchronism check)
°
––
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