Settings - Siemens Siprotec 7VK61 Manual

Functions
2.3 Overcurrent protection (optional)
sible that high short circuit currents flow from busbar A to busbar B or to feeder 2 via the current transformers.
These currents could cause different transformation errors in the two current transformer sets I
cially in the saturation range. The protection should therefore not be set unnecessarily sensitive. If the minimum
short circuit currents on the busbars are known, the pickup threshold Iph> STUB is set somewhat (approx.
10 %) below the minimum two-phase short circuit current, 3I0> STUB is set below the minimum single-phase
current. If only the phase currents are to be monitored, set the pickup value of the earth current stage to ∞.
The times T Iph STUB (address 2631) and T 3I0 STUB (address 2633) are set to 0 for this application to
prevent the protection from operating while the line isolator is closed.
If this stage is applied differently, similar considerations as for the other overcurrent stages apply.
The parameter I-STUB Telep/BI (address 2634) defines whether the time delays T Iph STUB (address
2631) and T 3I0 STUB (address 2633) can be bypassed by the binary input „>O/C InstTRIP". The binary
input (if allocated) is applied to all stages of the time-overcurrent protection. With I-STUB Telep/BI = YES
you define that the I>>> stages trip without delay after pickup if the binary input was activated. For I-STUB
Telep/BI = NO the set delays are always active.
If the I>>> stage, when switching the line on to a fault, is to trip without delay or with a short delay, SOTF Time
DELAY (address 2680, see above under margin heading „General"), the parameter I-STUB SOTF (address
2635) is set to YES. If using the stub protection, then set to NO as the effect of this protection function only
depends on the position of the isolator.
2.3.4

Settings

The table indicates region-specific presettings. Column C (configuration) indicates the corresponding second-
ary nominal current of the current transformer.
Addr. Parameter
2601 Operating Mode
2610 Iph>>
2611 T Iph>>
2612 3I0>> PICKUP
2613 T 3I0>>
2614 I>> Telep/BI
2615 I>> SOTF
2620 Iph>
2621 T Iph>
2622 3I0>
2623 T 3I0>
2624 I> Telep/BI
78
C Setting Options
ON
OFF
0.10 .. 25.00 A; ∞
1A
0.50 .. 125.00 A; ∞
5A
0.00 .. 30.00 sec; ∞
0.05 .. 25.00 A; ∞
1A
0.25 .. 125.00 A; ∞
5A
0.00 .. 30.00 sec; ∞
NO
YES
NO
YES
0.10 .. 25.00 A; ∞
1A
0.50 .. 125.00 A; ∞
5A
0.00 .. 30.00 sec; ∞
0.05 .. 25.00 A; ∞
1A
0.25 .. 125.00 A; ∞
5A
0.00 .. 30.00 sec; ∞
NO
YES
Default Setting
ON Operating mode
2.00 A Iph>> Pickup
10.00 A
0.30 sec T Iph>> Time delay
0.50 A 3I0>> Pickup
2.50 A
2.00 sec T 3I0>> Time delay
YES Instantaneous trip via Tele-
prot./BI
NO Instantaneous trip after
SwitchOnToFault
1.50 A Iph> Pickup
7.50 A
0.50 sec T Iph> Time delay
0.20 A 3I0> Pickup
1.00 A
2.00 sec T 3I0> Time delay
NO Instantaneous trip via Tele-
prot./BI
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
and I , espe-
A B
Comments