E03504
Selectable features
Zone 2
Zone 3
Zone 2
Zone 3
Zone 1
Zone 1
Zone 4
Zone 4
Fast Z4
Fast Z4
Trip A
Trip B
Z4
Z3
Z2
ZP
Z1
Z4
Z3
Z2
ZP
Z1
CRx
CRx
CTx
CTx
&
&
&
&
TZ4
TZ3
TZ2
TZP
TZ1
1
1
TZ4
TZ3
TZ2
TZP
TZ1
Z
B
Z
A
Figure 105: Aided Distance Blocking scheme (BOP)
4.6
AIDED DISTANCE UNBLOCKING SCHEMES
The Unblocking schemes are specifically designed for use with Power Line Carrier (PLC) communications where
different frequencies are used to indicate that a guard (no-fault condition) or a trip (fault condition) signal should
be transmitted to the remote terminal(s). Normally, either a guard signal or a trip signal should be transmitted and
received. Under certain fault conditions however, the PLC signal can be heavily attenuated or even lost completely.
In such conditions, Permissive Overreach Unblocking schemes allow the permissive tripping to operate for a short
period after the carrier is lost. This ensures fast, selective fault clearance.
To use this scheme you need to assign two inputs. Generally, the inputs are mapped to opto-inputs in the default
PSL. The table below shows a default mapping for Aided Scheme 1.
Chapter 8 - Carrier Aided Schemes P543i/P545i
220 P54x1i-TM-EN-1
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