Other setting combinations are possible, but not recommended.
Second harmonic blocking level can be set for the function and can be used to block each
step individually.
EF4PTOC (51N/67N) can be used as main protection for phase-to-ground faults.
EF4PTOC (51N/67N) can also be used to provide a system back-up 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. Current reversal and weak-end infeed
functionality are available as well.
7.6.3 Function block
ANSI08000004-2-en.vsd
EF4PTOC (51N_67N)
I3P*
V3P*
I3PPOL*
I3PDIR*
BLOCK
BLK1
BLK2
BLK3
BLK4
TRIP
TRST1
TRST2
TRST3
TRST4
BFI_3P
PU_ST1
PU_ST2
PU_ST3
PU_ST4
PUFW
PUREV
2NDHARMD
ANSI08000004 V2 EN
Figure 98: EF4PTOC (51N/67N) function block
7.6.4 Signals
Table 103: EF4PTOC Input signals
Name
Type Default Description
I3P GROUP
SIGNAL
- Three phase group signal for current inputs
U3P GROUP
SIGNAL
- Three phase group signal for polarizing voltage inputs
I3PPOL GROUP
SIGNAL
- Three phase group signal for polarizing current inputs
Table continues on next page
Section 7 1MRK 506 335-UUS A
Current protection
216
Technical manual
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