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8.2.2
Functionality
The four step residual overcurrent protection, zero or negative sequence direction
(EF4PTOC, 51N/67N) has independent inverse time delay settings for step 1 and 4. Step
2 and 3 are always definite time delayed.
All IEC and ANSI inverse time characteristics are available.
EF4PTOC (51N/67N) can be set directional or non-directional independently for each of
the steps.
The directional part of the function can be set to operate on following combinations:
•
Directional current (I3PDir) versus Polarizing voltage (V3PPol)
•
Directional current (I3PDir) versus Polarizing current (I3PPol)
•
Directional current (I3PDir) versus Dual polarizing (VPol+ZPol x IPol) where ZPol
= RPol + jXPol
IDir, VPol and IPol can be independently selected to be either zero sequence or negative
sequence.
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.
8.2.3
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 92:
EF4PTOC (51N/67N) function block
Section 8
1MRK 502 048-UUS A
Current protection
204
Technical manual
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