Figure 116: Aided Def Blocking Scheme; Figure 117: Def Directional Signals; Aided Def Logic Diagrams - GE MiCOM P40 Agile Technical Manual

P543i/P545i
The figures below show the element reaches, and the simplified scheme logic of the Aided Directional Earth Fault
(Aided DEF) Blocking scheme.
DEF-Reverse
DEF-Reverse
DEF-Forward
DEF Inst
DEF Bu1
DEF Bu2
DEF IDMT
E03519

Figure 116: Aided DEF Blocking scheme

5.7

AIDED DEF LOGIC DIAGRAMS

5.7.1 DEF DIRECTIONAL SIGNALS
DEF Forward element
892
Pole Dead A
893
Pole Dead B
894
Pole Dead C
DEF Reverse element
V03526

Figure 117: DEF Directional Signals

P54x1i-TM-EN-1
DEF-Forward
A
DEF-Forward
CRx
Start
CTx
Stop
&
1
t Bu1
t Bu2
t IDMT
1
ZL
CRx
Start
CTx
Stop
Trip Trip
A B
1
&
&
Chapter 8 - Carrier Aided Schemes
B
DEF-Reverse
DEF-Reverse
&
DEF-Forward
DEF Inst
DEF Bu1
t
Bu1
DEF Bu2
t
Bu2
DEF IDMT
t IDMT
996
DEF Forward
997
DEF Reverse
233