8.4.2
Functionality
The four step residual overcurrent protection EF4PTOC has an inverse or definite
time delay independent for each step.
All IEC and ANSI time-delayed characteristics are available together with an optional
user defined characteristic.
EF4PTOC can be set directional or non-directional independently for each of the
steps.
IDir, UPol 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 can be used as main protection for phase-to-earth faults.
EF4PTOC 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
EF4PTOC
I3P*
U3P*
I3PPOL*
I3PDIR*
BLOCK
BLKTR
BLKST1
BLKST2
BLKST3
BLKST4
ENMULT1
ENMULT2
ENMULT3
ENMULT4
CBPOS
CLOSECB
OPENCB
TRIP
TRIN1
TRIN2
TRIN3
TRIN4
TRSOTF
START
STIN1
STIN2
STIN3
STIN4
STSOTF
STFW
STRV
2NDHARMD
IEC06000424-4-en.vsdx
IEC06000424 V4 EN
Figure 163:
EF4PTOC function block
8.4.4
Signals
Section 8
1MRK502052-UEN B
Current protection
354
Technical manual
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