4 Technical Data
536
7SD5 Manual
C53000-G1176-C169-1
4.5
Distance Protection (optional)
Earth Impedance Ratio
Mutual Impedance Ratio
Phase Preferences
Earth Fault Detection
Pickup (optional)
R
E
/R
L
-0.33 to 7.00
Increments 0.01
X
E
/X
L
-0.33 to 7.00
Increments 0.01
Separate for first and higher zones
K
0
0.000 to 4.000
Increments 0.001
PHI (K
0
)
-135.00
°
to +135.00
°
Separate for first and higher zones
The matching factors for earth impedance are valid also for fault locating.
R
M
/R
L
0.00 to 8.00
Increments 0.01
X
M
/X
L
0.00 to 8.00
Increments 0.01
The matching factors for the mutual impedance ratio are valid also for fault locating.
For double earth fault in earthed net
Block leading phase–earth
Block lagging phase–earth
Release all associated loops
Release only phase-to-earth loops
Release of phase-to-phase loops
For double earth fault in isolated or resonant-earthed
systems
L3(L1) acyclic
L1(L3) acyclic
L2(L1) acyclic
L1(L2) acyclic
L3(L2) acyclic
L2(L3) acyclic
L3(L1) acyclic
L1(L3) acyclic
All associated loops
Earth current 3
I
0
>
for
I
N
= 1 A 0.05 A to 4.00 A
Increments 0.01 A
for
I
N
= 5 A 0.25 A to 20.00 A
Earth voltage 3U
0
>
1 V to 100 V;
∞
Increments 1 V
Dropout to pickup ratio
Approx. 0.95
Measuring tolerances for sinusoidal measured values
±
5 %
Overcurrent Pickup
Overcurrent
I
ph>> for
I
N
= 1 A 0.25 A to 10.00 A
Increments 0.01 A
for
I
N
= 5 A 1.25 A to 50.00 A
Dropout to pickup ratio
Approx. 0.95
Measuring tolerances for sinusoidal measured values
±
5 %
Voltage and angle-dependent current pickup (U/
I
/
ϕ
) (selectable)
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