The directional function is voltage polarized.
NS4PTOC can be set directional or non-directional independently for each of the
steps.
NS4PTOC can be used as main protection for unsymmetrical fault; phase-phase
short circuits, phase-phase-earth short circuits and single phase earth faults.
NS4PTOC 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.
7.5.3
Function block
GUID-8EDB8B12-0D86-4F6B-A1FB-F5D0C72AA545 v2
NS4PTOC
I3P*
I3PDIR*
U3P*
BLOCK
BLKTR
BLKST1
BLKST2
BLKST3
BLKST4
ENMULT1
ENMULT2
ENMULT3
ENMULT4
TRIP
TR1
TR2
TR3
TR4
START
ST1
ST2
ST3
ST4
STFW
STRV
IEC10000054-2-en.vsd
IEC10000054 V2 EN-US
Figure 98:
NS4PTOC function block
7.5.4
Signals
PID-4151-INPUTSIGNALS v4
Table 93:
NS4PTOC Input signals
Name
Type
Default
Description
I3P
GROUP
SIGNAL
-
Group connection for operate current
I3PDIR
GROUP
SIGNAL
-
Group connection for directional current
U3P
GROUP
SIGNAL
-
Group connection for polarizing voltage
BLOCK
BOOLEAN
0
General block
BLKTR
BOOLEAN
0
Block of trip
BLKST1
BOOLEAN
0
Block of step 1 (Start and trip)
BLKST2
BOOLEAN
0
Block of step 2 (Start and trip)
Table continues on next page
1MRK 506 382-UEN A
Section 7
Current protection
Line distance protection REL650 2.2 IEC
205
Technical manual
Summary of Contents for RELION 650 SERIES
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