
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.
8.3.3
Function block
GUID-8EDB8B12-0D86-4F6B-A1FB-F5D0C72AA545 v2
NS4PTOC (46I2)
I3P*
I3PDIR*
V3P*
BLOCK
BLKTR
BLK1
BLK2
BLK3
BLK4
MULTPU1
MULTPU2
MULTPU3
MULTPU4
TRIP
TRST1
TRST2
TRST3
TRST4
PICK UP
PU_ST1
PU_ST2
PU_ST3
PU_ST4
PUFW
PUREV
ANSI10000054-1-en.vsd
ANSI10000054 V1 EN-US
Figure 65:
NS4PTOC (4612) function block
Section 8
1MRK 511 408-UUS A
Current protection
214
Phasor measurement unit RES670 2.2 ANSI
Technical manual
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