Functions
2.5 Distance Protection
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
141
2.5.1.5 Settings
Addresses which have an appended "A" can only be changed with DIGSI, under Additional Settings.
The table indicates region-specific presettings. Column C (configuration) indicates the corresponding second-
ary nominal current of the current transformer.
Addr. Parameter C Setting Options Default Setting Comments
1218 T3I0 1PHAS 0.00 .. 0.50 sec; ∞ 0.04 sec Delay 1ph-faults
(comp/isol. star-point)
1501 FCT Distance ON
OFF
ON Distance protection
1502 Minimum Iph> 1A 0.05 .. 4.00 A 0.10 A Phase Current threshold
for dist. meas.
5A 0.25 .. 20.00 A 0.50 A
1503 3I0> Threshold 1A 0.05 .. 4.00 A 0.10 A 3I0 threshold for neutral
current pickup
5A 0.25 .. 20.00 A 0.50 A
1504 3U0> Threshold 1 .. 100 V; ∞ 5 V 3U0 threshold zero seq.
voltage pickup
1505 3U0> COMP/ISOL. 10 .. 200 V; ∞∞V 3U0> pickup (comp/ isol.
star-point)
1507A 3I0>/ Iphmax 0.05 .. 0.30 0.10 3I0>-pickup-stabilisation
(3I0> /Iphmax)
1508 SER-COMP. NO
YES
NO Series compensated line
1509A E/F recognition 3I0> OR 3U0>
3I0> AND 3U0>
3I0> OR 3U0> criterion of earth fault rec-
ognition
1510 Start Timers on Dis. Pickup
on Zone Pickup
on Dis. Pickup Condition for zone timer
start
1511 Distance Angle 30 .. 90 ° 85 ° Angle of inclination, dis-
tance charact.
1515 Paral.Line Comp NO
YES
YES Mutual coupling parall.line
compensation
1520 PHASE PREF.2phe 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 loops
L3 (L1) ACYCLIC Phase preference for 2ph-
e faults
1521A 2Ph-E faults Block leading Ø
Block lagging Ø
All loops
Ø-Ø loops only
Ø-E loops only
Block leading Ø Loop selection with 2Ph-E
faults
1523 Uph-ph unbal. 5 .. 50 % 25 % Max Uph-ph unbal. for 1ph
Flt. detection
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