Current Reversal And Wei Logic For Distance Protection Phase Segregated Zcwspsch (85) - ABB REL650 series Technical Manual

Section 12
Scheme communication
12.3
12.3.1
12.3.2
12.3.3
508
Current reversal and WEI logic for distance protection
phase segregated ZCWSPSCH (85)
Identification
Function description
Current reversal and WEI logic for
distance protection phase segregated
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 undervoltage criteria and no reverse zone operation gives
an instantaneous one- or three-phase trip. The received signal is also echoed back during
200 ms to accelerate the sending end.
Function block
ZCWSPSCH (85)
V3P* IRVL
BLOCK TRWEI
IFWD TRWEI_A
IREV TRWEI_B
WEIBLK1 TRWEI_C
WEIBLK2 ECHO
BLKZ
CBOPEN
CRL
ANSI10000219-1-en.vsd
ANSI10000219 V1 EN
Figure 238: ZCWSPSCH (85) function block
IEC 61850 IEC 60617
identification identification
ZCWSPSCH -
1MRK 506 335-UUS A
ANSI/IEEE C37.2
device number
85
Technical manual