ABB Relion 650 Series Technical Manual page 163

1MRK 506 326-UUS B
Table 74: OC4PTOC (51_67) Non group settings (basic)
Name Values (Range)
GlobalBaseSel 1 - 6
MeasType DFT
RMS
6.3.6 Monitored data
Table 75:
Name
DIR_A
DIR_B
DIR_C
I_A
I_B
I_C
6.3.7 Operation principle
The Four step overcurrent protection function OC4PTOC (51/67) is divided into three different
sub-functions, one for each step. For each step
is set by
The protection design can be decomposed in three parts:
• The direction element
• The four step over current function
• The mode selection
The sampled analog phase currents are processed in a pre-processing function block. Using a
parameter setting
protection function OC4PTOC (51/67), it is possible to select the type of the measurement used
for all overcurrent stages. It is possible to select either discrete Fourier filter (DFT) or true RMS
filter (RMS).
Line distance protection REL650
Technical manual
Unit
-
-
OC4PTOC (51_67) Monitored data
Type
INTEGER
INTEGER
INTEGER
REAL
REAL
REAL
DirModeSelx : Disable / Non-directional / Forward / Reverse .
If VT inputs are not available or not connected, setting parameter
shall be left to default value,
MeasType within the general settings for the four step phase overcurrent
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Step Default
1 1
- DFT
Values (Range) Unit
0=No direction -
1=Forward
2=Reverse
0=No direction -
1=Forward
2=Reverse
0=No direction -
1=Forward
2=Reverse
- A
- A
- A
x , where x is step 1, 2, 3 and 4, an operation mode
Non-directional .
Description
Selection of one of the Global Base Value
groups
Selection between DFT and RMS
measurement
Description
Direction for phase A
Direction for phase B
Direction for phase C
Current in phase A
Current in phase B
Current in phase C
DirModeSelx
Section 6
Current protection
PID-1800-MONITOREDDATA v7
M12883-3 v4
M12883-16 v6
157