Main Protection In The Pop Z1 Scheme; Logic Diagram For The Pop Z1 Scheme - GE MiCOM P40 Agile Technical Manual

P44x/EN AP/Hb6
(AP) 5-52
as a reverse fault detector. This is used in the current reversal logic and in the optional weak
infeed echo feature.
Note:
The signaling channel is keyed from operation of zone 1 elements set to overreach the
protected line. If the remote relay has picked up in zone 1, then it will operate with
Transmission Time ('Distance schemes / Aid Dist Delay') delay upon reception of the
permissive signal.
Send logic:
Permissive trip logic: Zone 1 plus Channel Received.
Figure 29: Main protection in the POP Z1 scheme
Figure 30: Logic diagram for the POP Z1 scheme
Should the signalling channel fail, the fastest tripping in the Basic scheme will be
subject to the tZ2 time delay.
Zone 1
A
Z2B
Z2A
Z1A
ZL
Z1B
Application Notes
MiCOM P40 Agile P442, P444
B
P3059EN