Current Reversal And Weak-End Infeed Logic For Distance Protection 3-Phase Zcrwpsch - ABB REC670 Applications Manual

1MRK 511 401-UEN A
15.2
15.2.1
15.2.2
15.2.2.1
Bay control REC670 2.2 IEC
Application manual
tSendMin
Set = 0.1 s (0 s in parallel line applications)
Set Unblock =
tSecurity
Set = 0.015 s
Current reversal and Weak-end infeed logic for
distance protection 3-phase ZCRWPSCH
Identification
Function description
Current reversal and weak-end infeed
logic for distance protection 3-phase
Application
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 193 and Figure 194. 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
A1
L2
A2
IEC99000043 V3 EN-US
Figure 193: 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.
Off
IEC 61850
identification
ZCRWPSCH
B1
B2
IEC9900043-2.vsd
Section 15
Scheme communication
IEC 60617 ANSI/IEEE C37.2
identification device number
- 85
IP15751-1 v4
M15073-1 v5
IP15023-1 v1
M13895-4 v6
441