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