Distance Protection - Siemens siprotec 7SA6 User Manual

Technical Data
10.2

Distance Protection

Earth Impedance
Matching
Mutual Impedance
Matching
(for Parallel Lines)
Phase Preferences
Earth Fault
Detection
Starting
10-12
R /R
E L
X /X
E L
K
0
PHI(K )
0
R /R
M L
X /X
M L
The matching factors for earth impedance and mutual impedance are valid also for
fault location.
For double earth fault
In earthed systems
For double earth fault
in isolated or resonant-grounded systems
Earth current 3I >
0
Displacement voltage 3U
Drop-off to pick-up ratios
Measuring tolerances for
sinusoidal measured values
*) Secondary values based on I
Overcurrent starting
Overcurrent Iph >>
Drop-off to pick-up ratio
Measuring tolerances
for sinusoidal measured values
–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
blocking of lagging phase–earth and
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
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
0.05 A to 4.00 A
1 V to 100 V; ∞
>
0
approx. 0.95
± 5 %
= 1 A; for I = 5 A they must be multiplied with 5.
N N
0.25 A to 10.00 A
approx. 0.95
± 5 %
(steps 0.01)
(steps 0.01)
(steps 0.001)
(steps 0.01)
(steps 0.01)
(steps 0.01)
*)
(steps 0.01·A)
(steps 1 V)
1
) (steps 0.01 A)
7SA6 Manual
C53000-G1176-C133-1