Alstom MiCOM P545 - 1.23.2 Distance scheme POR - permissive overreach transfer trip (Distance option only)

P54x/EN OP/La4 Operation
(OP) 5-62 MiCOM P543, P544, P545 & P546
OP
Figure 36 shows the simplified scheme logic.
Send logic: Zone 1
Permissive trip logic: Zone 2 plus Channel Received
A
B
Z
Z
Zone 1
Zone 2
Zone 3
Zone 1
Zone 2
Zone 3
TZ1
TZp
TZ2
TZ3
TZ4
Z1
Zp
Z2
Z3
Z4
1
Trip A
TZ1
TZp
TZ2
TZ3
TZ4
Z1
Zp
Z2
Z3
Z4
1
Trip B
&
&
CRx
CRx
CTx
CTx
Optional features of scheme
P1145ENb
P1134ENa
Figure 36 Permissive underreach transfer trip scheme (PUR) (Distance option only)
Detailed logic is shown in Figure 37, as follows:
&
100ms
P1586ENb
DDB: CRx (494,508)
SET: PUR Selected
DDB: Aided Trip En (501,517)
Figure 37 PUR (Distance option only)
1.23.2 Distance scheme POR - permissive overreach transfer trip (Distance option only)
The ch
annel for a POR scheme is keyed by operation of the overreaching zone 2 elements
of the relay. If the remote relay has detected a forward fault upon receipt of this signal, the
relay will operate with no additional delay. Faults in the last 20%
(Note 1)
of the protected line
are therefore cleared with no intentional time delay.
Note 1: Assuming a 20% typical “end-zone” when Zone 1 is set to 80% of the
protected line.