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4 Technical Data
4.2
Distance Protection
Earth Impedance Ratio
R
/R
E
L
X
/X
E
L
K
0
PHI (K
)
0
Mutual Impedance Ratio
R
/R
M
L
X
/X
M
L
The matching factors for earth impedance and mutual impedance are valid also for fault location.
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
Drop-off to pick-up ratio
Measuring tolerances for sinusoidal measured values ± 5 %
444
-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) cyclic
L1(L3) cyclic
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
Increments 0.01
Increments 0.01
Increments 0.001
Increments 0.01
Increments 0.01
Increments 0.01 A
Increments 1 V
7SA522 Manual
C53000-G1176-C155-3
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