Operation Principle - ABB REL650 series Technical Manual

Section 12
Scheme communication
Name Values (Range)
WEI Disabled
Echo
Echo & Trip
tPickUpWEI 0.000 - 60.000
PU27PP 10 - 90
PU27PN 10 - 90
Table 345: ZCWSPSCH (85) Non group settings (basic)
Name Values (Range)
GlobalBaseSel 1 - 6
12.3.6
12.3.6.1
510
Unit Step
- -
s 0.001
%VB 1
%VB 1
Unit Step
- 1

Operation principle

Current reversal logic
The current reversal logic uses a reverse zone connected to the input IREV to recognize
the fault on the parallel or any other outgoing line in any of the phases. When the reverse
zone has been activated for a certain settable time tPickUpRev it prevents sending of a
communication signal and activation of trip signal for a predefined time tDelayRev. This
makes it possible for the receive signal to reset before the trip signal is activated due to the
current reversal by the forward directed zone, see figure 239.
IREV
0
0-tPickUpRev
IFWD
ANSI10000259 V2 EN
Figure 239: Current reversal logic
The preventing of sending the send signal CS and activating of the TRIP is carried out by
connecting the IRVL signal to the inputs BLKTR and BLKCS in ZCPSCH (85).
The function has an internal 10 ms drop-off timer which secure that the current reversal
logic will be activated for short input signals even if the pick-up timer is set to zero.
Default Description
Disabled Operating mode of WEI logic
0.010 Coordination time for the WEI logic
70 Phase to Phase voltage for detection of fault
condition
70 Phase to Neutral voltage for detection of fault
condition
Default Description
1 Selection of one of the Global Base Value
groups
0 0-tPickUpRev
0
10ms
AND
1MRK 506 335-UUS A
IRVL
0
0-tDelayRev
ANSI05000122-2-en.vsd
Technical manual