Siemens siprotec 7SA6, Manual

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Technical Data
10-15
7SA6 Manual
C53000-G1176-C156
10.2 Distance Protection
Earth Impedance
Matching R
E
/R
L
–0.33 to 7.00 (steps 0.01)
X
E
/X
L
–0.33 to 7.00 (steps 0.01)
separate for first and higher zones
K
0
0.000 to 4.000 (steps 0.001)
PHI(K
0
) –135.00° to +135.00° (steps 0.01)
separate for first and higher zones
Mutual Impedance
Matching
(for Parallel Lines) R
M
/R
L
0.00 to 8.00 (steps 0.01)
X
M
/X
L
0.00 to 8.00 (steps 0.01)
The matching factors for earth impedance and mutual impedance are valid also for
fault location.
Phase Preferences For double earth fault blocking of lagging phase–earth and
In earthed systems phase–phase
blocking of leading phase–earth and
phase–phase
release of all associated loops
release of only phase-to-earth loops
release of only phase-to-phase loop
For double earth fault
in isolated or resonant-grounded 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 Fault
Detection Earth current 3I
0
> 0.05 A to 4.00 A
*)
(steps 0.01·A)
Displacement voltage 3U
0
> 1 V to 100 V;
∞
(steps 1 V)
Drop-off to pick-up ratios approx. 0.95
Measuring tolerances for
sinusoidal measured values
± 5 %
*) Secondary values based on I
N
= 1 A; for I
N
= 5 A they must be multiplied with 5.
Starting Overcurrent starting
Overcurrent Iph >> 0.25 A to 10.00 A
1
) (steps 0.01 A)
Drop-off to pick-up ratio approx. 0.95
Measuring tolerances
for sinusoidal measured values
± 5 %