Technical Data
4.6 Distance Protection (optional)
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
592
4.6 Distance Protection (optional)
Earth impedance ratio
Mutual Impedance Ratio
Phase preference
Earth fault detection
R
E
/R
L
-0.33 to 10.00 Increments 0.01
X
E
/X
L
-0.33 to 10.00 Increments 0.01
separate for first and higher zones
K
0
0.000 to 4.000 Increments 0.001
PHI (K
0
) -180.00° to +180.00°
separate for first and higher zones
The matching factors for earth impedance also apply to 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 3I
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%
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