Function Block - ABB RES670 Technical Manual

Section 8
Current protection
8.3.3
214
All IEC and ANSI time delayed characteristics are available together with an optional
user defined characteristic.
The directional function is voltage polarized.
NS4PTOC (4612) can be set directional or non-directional independently for each of
the steps.
NS4PTOC (4612) can be used as main protection for unsymmetrical fault; phase-phase
short circuits, phase-phase-ground short circuits and single phase ground faults.
NS4PTOC (4612) can also be used to provide a system backup for example, in the case
of the primary protection being out of service due to communication or voltage
transformer circuit failure.
Directional operation can be combined together with corresponding communication
logic in permissive or blocking teleprotection scheme. The same logic as for
directional zero sequence current can be used. Current reversal and weak-end infeed
functionality are available.

Function block

NS4PTOC (46I2)
I3P*
I3PDIR*
V3P*
BLOCK
BLKTR
BLK1 PICK UP
BLK2 PU_ST1
BLK3 PU_ST2
BLK4 PU_ST3
MULTPU1 PU_ST4
MULTPU2
MULTPU3 PUREV
MULTPU4
ANSI10000054-1-en.vsd
ANSI10000054 V1 EN-US
Figure 65: NS4PTOC (4612) function block
TRIP
TRST1
TRST2
TRST3
TRST4
PUFW
1MRK 511 408-UUS A
GUID-8EDB8B12-0D86-4F6B-A1FB-F5D0C72AA545 v2
Phasor measurement unit RES670 2.2 ANSI
Technical manual