ABB Relion 670 Series Applications Manual page 420

Section 15
Scheme communication
15.1.3.6 Intertrip scheme
Operation
Set
SchemeType
Set
Set tCoord
tSendMin
Set
Unblock
Set
tSecurity
Set
15.2 Current reversal and Weak-end infeed logic for distance
protection 3-phase ZCRWPSCH (85)
15.2.1 Identification
Function description
Current reversal and weak-end
infeed logic for distance protection
3-phase
15.2.2 Application
15.2.2.1 Current reversal logic
To avoid this kind of disturbances, a fault current reversal logic (transient blocking logic) can be
used.
The unwanted operations that might occur can be explained by looking into Figure
Figure 199. Initially the protection A2 at A side will detect a fault in forward direction and send a
communication signal to the protection B2 at remote end, which is measuring a fault in reverse
direction.
Strong
source
ANSI99000043 V1 EN-US
Figure 198: Current distribution for a fault close to B side when all breakers are closed
When the breaker B1 opens for clearing the fault, the fault current through B2 bay will invert. If the
communication signal has not reset at the same time as the distance protection function used in
414
Enabled
=
Intertrip
=
= 50 ms (10 ms + maximal transmission time)
= 0.1 s (0 s in parallel line applications)
Disabled
=
= 0.015 s
CLOSED
LINE 1
A:1
A
CLOSED
LINE 2
A:2
© Copyright 2017 ABB. All rights reserved
IEC 61850 IEC 60617
identification identification
ZCRWPSCH -
CLOSED
FAULT
source
B:1
B
CLOSED
B:2
en99000043_ansi.vsd
ANSI/IEEE C37.2
device number
85
Weak
Bay control REC670
1MRK 511 401-UUS F
M13869-62 v5
IP15751-1 v4
M15073-1 v5
IP15023-1 v1
M13895-4 v6
198 and
Application manual