Functions
2.9 Backup Time Overcurrent Protection
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011
120
Accordingly, the earth current stage 3I0> STUB (address 2632) should pick up on the smallest earth current
to be expected during an earth fault and the delay T 3I0 STUB (address 2633) should exceed the base time
of the differential protection by one grading time. If only the phase currents are to be monitored, set the pickup
value of the earth current stage to ∞.
The I>>> stage can also be accelerated by the release signal „>O/C InstTRIP“ (no. 7110) e.g. before au-
tomatic reclosing. This is defined using parameter I-STUB Telep/BI (address 2634). Set this parameter to
YES if you want the I>>> stage to trip instantaneously while the binary input „>O/C InstTRIP“ is active or
the internal automatic reclosing function is ready to operate.
Instantaneous tripping by the operational auto-reclosure should only be chosen if the I>>> stage is set as an
emergency function. If the differential protection is out of operation, this emergency stage guarantees instan-
taneous tripping before auto-reclosure.
Instantaneous tripping when the line is switched onto a fault is also possible with the I>>> stage. Set parameter
I-STUB SOTF (address 2635) to YES if instantaneous tripping is desired.
2.9.4 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
2601 Operating Mode ON
Only Emer. prot
OFF
ON Operating mode
2602 SOTF Time DELAY 0.00 .. 30.00 sec 0.00 sec Trip time delay after SOTF
2603A Direct. 3I0 U0/I0 or U2/I0
with U0/I0
with U2/I2
U0/I0 or U2/I0 Measurement of direction
for 3I0
2610 Iph>> 1A 0.05 .. 50.00 A; ∞ 2.00 A Iph>> Pickup
5A 0.25 .. 250.00 A; ∞ 10.00 A
2611 T Iph>> 0.00 .. 30.00 sec; ∞ 0.30 sec T Iph>> Time delay
2612 3I0>> PICKUP 1A 0.05 .. 25.00 A; ∞ 0.50 A 3I0>> Pickup
5A 0.25 .. 125.00 A; ∞ 2.50 A
2613 T 3I0>> 0.00 .. 30.00 sec; ∞ 2.00 sec T 3I0>> Time delay
2614 I>> Telep/BI NO
YES
YES Instantaneous trip via Tele-
prot./BI
2615 I>> SOTF NO
YES
NO Instantaneous trip after
SwitchOnToFault
2620 Iph> 1A 0.05 .. 50.00 A; ∞ 1.50 A Iph> Pickup
5A 0.25 .. 250.00 A; ∞ 7.50 A
2621 T Iph> 0.00 .. 30.00 sec; ∞ 0.50 sec T Iph> Time delay
2622 3I0> 1A 0.05 .. 25.00 A; ∞ 0.20 A 3I0> Pickup
5A 0.25 .. 125.00 A; ∞ 1.00 A
2623 T 3I0> 0.00 .. 30.00 sec; ∞ 2.00 sec T 3I0> Time delay
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