Aided Def Logic Diagrams; Def Directional Signals; Figure 85: Aided Def Blocking Scheme; Figure 86: Def Directional Signals - GE MiCOM P40 Technical Manual

Chapter 8 - Carrier Aided Schemes
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 85: Aided DEF Blocking scheme

5.7

AIDED DEF LOGIC DIAGRAMS

5.7.1

DEF DIRECTIONAL SIGNALS

DEF Forward element
Pole Dead A
Pole Dead B
Pole Dead C
DEF Reverse element
V03526

Figure 86: DEF Directional Signals

190
DEF-Forward
A
DEF-Forward
CRx
Start
CTx
Stop
&
1
t Bu1
t Bu2
t IDMT
892
893
1
894
ZL
CRx
Start
CTx
Stop
Trip Trip
A B
1
&
&
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
P446SV-TM-EN-1
P446SV