ABB Relion 670 series - Current Reversal and Weak-End Infeed Logic for Distance Protection 3-Phase ZCRWPSCH (85)

16.3 Current reversal and Weak-end infeed logic for distance
protection 3-phase ZCRWPSCH (85)
16.3.1 Identification
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
16.3.2 Application
16.3.2.1 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
372
and Figure
373. 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.
en99000043_ansi.vsd
Strong
source
LINE 1
LINE 2
A:1
A:2
B:1
B:2
A B
Weak
source
FAULT
CLOSED
CLOSED
CLOSED
CLOSED
ANSI99000043 V1 EN
Figure 372: 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.
Section 16 1MRK 506 369-UUS -
Scheme communication
762 Line distance protection REL670 2.2 ANSI
Application manual