
Table 94:
OC4SPTOC (51_67) 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
7.4.6
Monitored data
Table 95:
OC4SPTOC (51_67) Monitored data
Name
Type
Values (Range)
Unit
Description
DIRL1
INTEGER
1=Forward
2=Reverse
0=No direction
-
Direction for phase A
DIRL2
INTEGER
1=Forward
2=Reverse
0=No direction
-
Direction for phase B
DIRL3
INTEGER
1=Forward
2=Reverse
0=No direction
-
Direction for phase C
IL1
REAL
-
A
Current in phase A
IL2
REAL
-
A
Current in phase B
IL3
REAL
-
A
Current in phase C
7.4.7
Operation principle
The function 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
DirModeSelx
:
Disabled
/
Non-
directional
/
Forward
/
Reverse
.
The protection design can be decomposed in four parts:
•
The direction element
•
The four step over current function
•
The mode selection
•
The 2nd harmonic restraint
If VT inputs are not available or not connected, setting parameter
DirModeSelx
shall be left to default value,
Non-directional
.
1MRK 506 335-UUS A
Section 7
Current protection
209
Technical manual
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