DIR REV
DIR REV
DIR FWD
DIR FWD
DIR FWD DIR FWD
Z (T)
Z (T)
G
H
R R
1
1
CTX
CTX
CRX CRX
Signalling
Equipment
Signalling
Equipment
& &
CB
OPEN
CB
OPEN
DIR FWD
&
&
DIR FWD
1 1
Trip G
Trip H
END H
END G
TZ (T)
Z
TZ (T)
Z
t
0
t
0
E03520
Figure 124: Aided Delta POR scheme
6.2
AIDED DELTA BLOCKING SCHEME
The signalling channel is keyed from operation of the Delta Reverse elements. If the remote device has detected
Delta Forward, it operates after the trip delay if no block is received.
The logic is:
● Send logic: Key channel if a Delta Fault Reverse condition is detected
● Trip logic: Trip if a Delta Fault Forward condition is detected, AND a keyed channel signal is NOT received,
before the Aided Delta Delay timer expires.
This scheme is shown in the figure below.
P543i/P545i Chapter 8 - Carrier Aided Schemes
P54x1i-TM-EN-1 239
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