12.6.5
Settings
Table 359:
ECRWPSCH (85) Group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
CurrRev
Disabled
Enabled
-
-
Disabled
Operating mode of Current Reversal Logic
tPickUpRev
0.000 - 60.000
s
0.001
0.020
Pickup time for current reversal logic
tDelayRev
0.000 - 60.000
s
0.001
0.060
Time Delay to prevent Carrier send and local
trip
WEI
Disabled
Echo
Echo & Trip
-
-
Disabled
Operating mode of WEI logic
tPickUpWEI
0.000 - 60.000
s
0.001
0.000
Coordination time for the WEI logic
3V0PU
5 - 70
%VB
1
25
Neutral voltage setting for fault conditions
measurement
Table 360:
ECRWPSCH (85) 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
12.6.6
Operation principle
12.6.6.1
Directional comparison logic function
The directional comparison function contains logic for blocking overreaching and
permissive overreaching schemes during current reversal.
The circuits for the permissive overreaching scheme contain logic for current reversal and
weak-end infeed functions. These functions are not required for the blocking scheme.
Use the independent or inverse time functions in the directional ground-fault protection
module to get back-up tripping in case the communication equipment malfunctions and
prevents operation of the directional comparison logic.
Figure
and figure
12.6.6.2
Fault current reversal logic
The fault current reversal logic uses a reverse directed element, connected to the input
signal IREV, which recognizes that the fault is in reverse direction. When the reverse
direction element is activated the output signal IRVL is activated which is shown in
1MRK 506 335-UUS A
Section 12
Scheme communication
525
Technical manual
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