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
8.2.3
Function block
EF4PTOC (51N_67N)
I3P*
V3P*
I3PPOL*
I3PDIR*
BLOCK
BLKTR
BLK1
BLK2
BLK3
BLK4
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
Figure 55:
EF4PTOC (51N/67N) function block
8.2.4
Signals
Table 99:
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 511 365-UUS A
Section 8
Current protection
Phasor measurement unit RES670 2.1 ANSI
189
Technical manual
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