7.4.2
Functionality
The four step phase overcurrent function for single pole tripping OC4SPTOC (51_67) has
an inverse or definite time delay independent for each step separately.
All IEC and ANSI time delayed characteristics are available.
The directional function is voltage polarized with memory. The function can be set to be
directional or non-directional independently for each of the steps.
Second harmonic blocking level can be set for the function and can be used to block each
step individually.
The tripping can be configured for one- and/or three-phase.
7.4.3
Function block
ANSI10000216-3-en.vsd
OC4SPTOC (51_67)
I3P
V3P*
BLOCK
BLK1
BLK2
BLK3
BLK4
TRIP
TRST1
TRST2
TRST3
TRST4
TR_A
TR_B
TR_C
PICKUP
PU_ST1
PU_ST2
PU_ST3
PU_ST4
PU_A
PU_B
PU_C
PU2NDHARM
ANSI10000216 V3 EN
Figure 95:
OC4SPTOC (51_67) function block
7.4.4
Signals
Table 90:
OC4SPTOC (51_67) Input signals
Name
Type
Default
Description
I3P
GROUP
SIGNAL
-
Three phase group signal for current inputs
U3P
GROUP
SIGNAL
-
Three phase group signal for voltage inputs
BLOCK
BOOLEAN
0
Block of function
BLKST1
BOOLEAN
0
Block of step 1
Table continues on next page
1MRK 506 335-UUS A
Section 7
Current protection
205
Technical manual
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