Table 76:
OC4PTOC Non group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
GlobalBaseSel
1 - 6
-
1
1
Selection of one of the Global Base Value
groups
MeasType
DFT
RMS
-
-
DFT
Selection between DFT and RMS
measurement
8.2.6
Monitored data
Table 77:
OC4PTOC Monitored data
Name
Type
Values (Range)
Unit
Description
DIRL1
INTEGER
1=Forward
2=Reverse
0=No direction
-
Direction for phase L1
DIRL2
INTEGER
1=Forward
2=Reverse
0=No direction
-
Direction for phase L2
DIRL3
INTEGER
1=Forward
2=Reverse
0=No direction
-
Direction for phase L3
IL1
REAL
-
A
Current in phase L1
IL2
REAL
-
A
Current in phase L2
IL3
REAL
-
A
Current in phase L3
8.2.7
Operation principle
The Four step phase overcurrent protection 3-phase output OC4PTOC is divided into
four different sub-functions, one for each step. For each step
x
, where x is step 1, 2,
3 and 4, an operation mode is set by
DirModex
:
Off
/
Non-directional
/
Forward
/
Reverse
.
The protection design can be divided in four parts:
•
The direction element
•
The harmonic Restraint Blocking function
•
The four step over current function
•
The mode selection
If VT inputs are not available or not connected, setting parameter
DirModex
shall be left to default value,
Non-directional
.
1MRK 504 135-UEN A
Section 8
Current protection
147
Technical manual
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