Alstom MiCOM P546 - Page 233

Operation P54x/EN OP/La4
MiCOM P543, P544, P545 & P546 (OP) 5-59
OP
Aided Tripping
Aided Trip En
Local Send
Feedback
Echo
Signal Send (CTx)
Protection:
Distance
DEF
Delta Dir
Signal Receive (CTx)
Channel Fail/
Loss of Guard
Channel Fail Alarm
Weak Infeed Tripping
Signal Receive
+ Scheme
Receive Logic
Aided Tripping
Logic
Protection:
Distance
DEF
Delta Dir
Send Logic
P1590ENa
Figure 32 Aided scheme logic overview (Distance option only)
The full Logic Diagrams of the Send, Receive and Aided Trip Logic are now attached here,
for reference. It is not necessary to understand the entire logic in order to apply any
scheme, as in later sections abbreviated scheme diagrams are available.