GE P444

Application Notes
P44x/EN AP/Hb
6
MiCOM P40 Agile P442, P444
(AP) 5-
107
P0491EN
X
-14°
FWDFWD
REV REV
R
Figure 79: Characteristic angle for aided DEF protection
4.8.3.2 Aided DEF Schemes
4.8.3.2.1 Aided DEF Permissive Overreach Scheme
Figure 80: Independent channel – permissive scheme
Figure 81: Shared channel – permissive scheme
Figure 82 shows the element reaches. The signalling channel is keyed from operation of the
forward IN> DEF element of the relay. If the remote relay has also detected a forward fault,
then it will operate with no additional delay upon receipt of this signal.
Send logic: IN> Forward pickup
Permissive trip logic: IN> Forward plus Channel Received.