IDir, VPol and IPol can be independently selected to be either zero sequence or negative sequence.
Second harmonic blocking can be set individually for each step.
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.
Residual current can be calculated by summing the three phase currents or taking the input from
neutral CT
8.4.3 Function block
M12619-3 v7
EF4PTOC (51N_67N)
I3P*
V3P*
I3PPOL*
I3PDIR*
BLOCK
BL KTR
BL K1
BL K2
BL K3
BL K4
MULTPU1
MULTPU2
MULTPU3
MULTPU4
52A
CLOSECMD
OPENCMD
TRIP
TRST1
TRST2
TRST3
TRST4
TRSOTF
PICK UP
PUST1
PUST2
PUST3
PUST4
PUSOTF
PUFW
PUREV
2NDHARMD
ANSI06000424 -4-en.vsd
ANSI06000424 V4 EN-US
Figure 253: EF4PTOC (51N/67N) function block
8.4.4 Signals
IP11453-1 v2
PID-6529-INPUTSIGNALS v4
Table 227: EF4PTOC (51N_67N) Input signals
Name Type Default Description
I3P GROUP
SIGNAL
- Group connection for operate current
V3P GROUP
SIGNAL
- Group connection for polarizing voltage
I3PPOL GROUP
SIGNAL
- Group connection for polarizing current
Table continues on next page
1MRK 502 066-UUS B Section 8
Current protection
471
Technical manual
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