Siemens siprotec 7SD5 User Manual page 424

2 Functions
Table 2-20 Operational measured values of the local device
Measured Values
I ; I ; I Phase currents
L1 L2 L3
I Sensitive earth current
EE
3I Earth current
0
ϕ(I ), ϕ(I
-I -I ), Phase angle of the phase currents
L1 L2 L2 L3
ϕ(I
-I ) towards each other
L3 L1
, I Positive and negative sequence com-
I
1 2
ponent of currents
I , I Transformer starpoint current or earth
Y P
current of the parallel line
U , U , U Phase-to-phase voltages
L1-L2 L2-L3 L3-L1
U , U , U Phase-earth voltage
L1-E L2-E L3-E
3U ; U Displacement voltage
0 0
ϕ(U ), ϕ(U
-U -U ), Phase angle of the phase voltages
L1 L2 L2 L3
ϕ(U
-U ) towards each other
L3 L1
ϕ(U ), ϕ(U
-I -I ), Phase angle of the phase voltages
L1 L1 L2 L2
ϕ(U
-I ) towards the phase currents
L3 L3
U , U Positive and negative sequence com-
1 2
ponent of the voltages
U ; U Voltage at measuring input U
X EN
U Positive sequence component of volt-
1compound
ages at the remote end (if compound-
ing is active in voltage protection)
R , R , Operational resistance of all loops
L1-E L2-E
R , R ,
L3-E L1-L2
R , R ,
L1-L2 L3-L1
X , X , Operational reactance of all loops
L1-E L2-E
X , X ,
L3-E L1-L2
X , X ,
L2-L3 L3-L1
S, P, Q Apparent, active and reactive power
cos ϕ
Power factor
f Frequency (constellation frequency)
Θ , Θ
/Θ /Θ , Thermal value of each phase,
L1 TRIP L2 TRIP
Θ
/Θ referred to the tripping value
L3 TRIP
Θ/Θ
Resulting thermal value,
TRIP
referred to the tripping value, calculat-
ed according to the set method
U , U , U Line voltage, busbar voltage and
Line Bus Diff
voltage difference (for synchronism
check)
f , f , f Line voltage, busbar frequency and
Line Bus 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
424
Primary Second-
ary
A A
A mA
A A
°
–
A A
A A
kV V
kV V
kV V
°
–
°
–
kV V
– V
4
kV V
Ω Ω
Ω Ω
MVA, –
MW,
MVAR
(abs) (abs)
Hz Hz
% –
% –
kV –
Hz –
°
–
% Referred to
Nominal operational current
Nominal operational current
Nominal operational current
–
Nominal operational current
Nominal operational current
Nominal operational voltage
Nominal operational voltage / √3
Nominal operational voltage / √3
–
–
Nominal operational voltage / √3
–
Operational rated voltage / √3
–
–
√3·U
·I Nominal operational
N N
1)2)
quantities
–
Nominal frequency
Trip overtemperature
Trip overtemperature
–
–
–
7SD5 Manual
C53000-G1176-C169-1
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