Monitored Data; Operation Principle - ABB RET650 Technical Manual

1MRK 504 135-UEN A
Table 76: OC4PTOC Non group settings (basic)
Name Values (Range)
GlobalBaseSel
MeasType
8.2.6
8.2.7
Technical manual
Unit
1 - 6 -
DFT -
RMS

Monitored data

Table 77: OC4PTOC Monitored data
Name
DIRL1
DIRL2
DIRL3
IL1
IL2
IL3

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.
Step Default
1 1
- DFT
Type Values (Range)
INTEGER 1=Forward
2=Reverse
0=No direction
INTEGER 1=Forward
2=Reverse
0=No direction
INTEGER 1=Forward
2=Reverse
0=No direction
REAL -
REAL -
REAL -
Section 8
Current protection
Description
Selection of one of the Global Base Value
groups
Selection between DFT and RMS
measurement
Unit Description
- Direction for phase L1
- Direction for phase L2
- Direction for phase L3
A Current in phase L1
A Current in phase L2
A Current in phase L3
147