ABB Relion 650 Series Technical Manual page 350

Section 11
Scheme communication
11.2.2 Functionality
The current reversal function is used to prevent unwanted operations due to current reversal when
using permissive overreach protection schemes in application with parallel lines when the
overreach from the two ends overlap on the parallel line.
The weak-end infeed logic is used in cases where the apparent power behind the protection can be
too low to activate the distance protection function. When activated, received carrier signal
together with local under voltage criteria and no reverse zone operation gives an instantaneous
trip. The received signal is also echoed back to accelerate the sending end.
11.2.3 Function block
V3P*
BLOCK
IFWD
IREV
WEIBLK1
WEIBLK2
BLKZ
CBOPEN
CRL
ANSI10000219 V1 EN-US
Figure 182: ZCWSPSCH (85) function block
11.2.4 Signals
Table 277: ZCWSPSCH (85) Input signals
Name
V3P
BLOCK
IFWD
IREV
WEIBLK1
WEIBLK2
BLKZ
CBOPEN
CRL
344
ZCWSPSCH (85)
IRVL
TRWEI
TRWEI_A
TRWEI_B
TRWEI_C
ECHO
ANSI10000219-1-en.vsd
Type
GROUP
SIGNAL
BOOLEAN
BOOLEAN
BOOLEAN
BOOLEAN
BOOLEAN
BOOLEAN
BOOLEAN
BOOLEAN
© Copyright 2011 ABB Power Grids. All rights reserved
Default Description
- Three phase group signal for voltage inputs
0 Block of function
0 A signal that indicates a forward fault has been detected and will
block tripping if there was a pre-existing reverse fault condition
(IREV)
0 A signal that indicates a reverse fault has been detected and
activates current reverasl logic
0 Block of WEI logic
0 Block of WEI logic due to operation of other protections that
would effect a pilot trip or the detection of reverse faults that will
be tripped by an external device
0 Block of trip from WEI logic through the loss of voltage (fuse-
failure) function
0 Block of trip from WEI logic by an open breaker
0 POTT or Unblock carrier receive for WEI logic
1MRK 506 326-UUS B
GUID-4009119C-F66F-4E3E-8008-8EEB3CD7BE9A v2
GUID-9368D8C5-0AA5-4E40-9503-EEF59AE67736 v1
PID-2348-INPUTSIGNALS v7
Line distance protection REL650
Technical manual