15.2.3.3
Blocking scheme
SEMOD141800-12 v1
Set
Operation
=
On
Set
Scheme
type
=
Blocking
Set
tCoord
= 25 ms (10 ms + maximal transmission time)
Set
tSendMin
= 0 s
15.2.3.4
Intertrip scheme
SEMOD141800-15 v1
Set
Operation
=
On
Set
Scheme
type
=
Intertrip
Set
tCoord
= 50 ms (10 ms + maximal transmission time)
Set
tSendMin
= 0.1 s
15.3
Current reversal and Weak-end infeed logic for
distance protection 3-phase ZCRWPSCH
IP15751-1 v4
15.3.1
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
15.3.2
Application
IP15023-1 v1
15.3.2.1
Current reversal logic
M13895-4 v5
If parallel lines are connected to common buses at both terminals, overreaching permissive
communication schemes can trip unselectable due to current reversal. The unwanted tripping
affects the healthy line when a fault is cleared on the parallel line. This lack of security results in
a total loss of interconnection between the two buses.
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
and
Figure
. 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.
Section 15
1MRK 505 343-UEN B
Scheme communication
610
Application manual
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