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 three-phase trip. The received signal is also echoed back during 200 ms
to accelerate the sending end.
On verification of a weak end infeed condition, the weak end infeed logic provides an
output for sending the received teleprotection signal back to the remote sending end and
other output(s) for tripping. For terminals equipped for single-, two-, and three-pole
tripping, outputs for the faulted phase(s) are provided. Undervoltage detectors are used to
select the faulted phase(s).
12.2.3
Function block
ANSI09000007-1-en.vsd
ZCRWPSCH (85)
V3P*
BLOCK
IFWD
IREV
WEIBLK1
WEIBLK2
BLKZ
CBOPEN
CRL
IRVL
TRWEI
ECHO
ANSI09000007 V1 EN
Figure 234:
ZCRWPSCH (85) function block
12.2.4
Signals
Table 337:
ZCRWPSCH (85) Input signals
Name
Type
Default
Description
V3P
GROUP
SIGNAL
-
Three phase group signal for voltage inputs
BLOCK
BOOLEAN
0
Block of function
IFWD
BOOLEAN
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)
IREV
BOOLEAN
0
A signal that indicates a reverse fault has been detected
and activates current reverasl logic
WEIBLK1
BOOLEAN
0
Block of WEI logic
WEIBLK2
BOOLEAN
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
Table continues on next page
1MRK 506 335-UUS A
Section 12
Scheme communication
503
Technical manual
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