12.3
Current reversal and WEI logic for distance protection
phase segregated ZCWSPSCH (85)
12.3.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Current reversal and WEI logic for
distance protection phase segregated
ZCWSPSCH
-
85
12.3.2
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 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.
12.3.3
Function block
ANSI10000219-1-en.vsd
ZCWSPSCH (85)
V3P*
BLOCK
IFWD
IREV
WEIBLK1
WEIBLK2
BLKZ
CBOPEN
CRL
IRVL
TRWEI
TRWEI_A
TRWEI_B
TRWEI_C
ECHO
ANSI10000219 V1 EN
Figure 238:
ZCWSPSCH (85) function block
Section 12
1MRK 506 335-UUS A
Scheme communication
508
Technical manual
Содержание REL650 series
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