ABB RED650, Applications Manual

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Set tSendMin = 0.1 s (0 s in parallel line applications)
Set Unblock = Off
Set
tSecurity
= 0.015 s
13.2 Current reversal and Weak-end infeed logic for
distance protection 3-phase ZCRWPSCH
IP15751-1 v4
13.2.1 Identification
M15073-1 v5
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Current reversal and weak-end infeed
logic for distance protection 3-phase
ZCRWPSCH - 85
13.2.2 Application
IP15023-1 v1
13.2.2.1 Current reversal logic
M13895-4 v6
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
122 and Figure 123 . 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.
L1
L2
A1
A2
B1
B2
IEC9900043-2.vsd
IEC99000043 V3 EN-US
Figure 122: 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 the teleprotection scheme has switched on to
forward direction, we will have an unwanted operation of breaker B2 at B side.
1MRK 505 393-UEN B
Section 13
Scheme communication
Line differential protection RED650 2.2 IEC 285
Application manual