Current Reversal And Weak-End Infeed Logic For Residual Overcurrent Protection Ecrwpsch (85) - ABB REC670 Applications Manual

1MRK 511 401-UUS A
15.5
15.5.1
15.5.2
15.5.2.1
Bay control REC670 2.2 ANSI
Application manual
Current reversal and weak-end infeed logic for
residual overcurrent protection ECRWPSCH (85)
Identification
Function description
Current reversal and weak-end infeed
logic for residual overcurrent protection
Application
Fault current reversal logic
Figure 195 and figure 196
current reversal.
Assume that fault is near the B1 breaker. B1 Relay sees the fault in Zone1 and A1 relay
identifies the fault in Zone2.
Note that the fault current is reversed in line L2 after the breaker B1 opening.
It can cause an unselective trip on line L2 if the current reversal logic does not block
the permissive overreaching scheme in the IED at B2.
CLOSED
Strong
source
A:1
A
CLOSED
A:2
ANSI99000043 V1 EN-US
Figure 195: Current distribution for a fault close to B side when all breakers are
closed
IEC 61850
identification
ECRWPSCH
show a typical system condition, which can result in a fault
CLOSED
FAULT
LINE 1
B:1
CLOSED
LINE 2
B:2
Section 15
Scheme communication
IEC 60617 ANSI/IEEE C37.2
identification device number
- 85
Weak
source
B
en99000043_ansi.vsd
IP14365-1 v4
M14883-1 v2
IP15041-1 v1
M15285-3 v7
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