ABB SDG-1T Instruction Leaflet page 39

(V
A1
V
XN
V
WO
- (K I + K I )Z
1
1 A 2 A2 C
(V V )
A1 + A2
V
O
+ V )
A2
V
0
2IG
K I
1 1
K I
2 2
K I
0 0
(V
V
XN
Z
OL
-K I Z
0 0 C
Z
1L
(V + V )
A1 A2
- (K IA + K I )Z
1 1 2 A2 C
V
XN
V
O
-K I Z
0 0
V
WO
Figure 18. Relay Voltages for AG to Ground Faults at Selected Points
BALANCE
POINT
+ V )
A1 A2
- (K IA + K I )Z
1 1 2 A2 C
V
O
Z
-K I Z
0 0 C
Z
V
WO
V
Z
OL
C
Z
1L
OL
1L
(V + V )
A1 A2
- (K IA + K I )Z
1 1 2 A2 C
XN
V
O
Z
-K I Z
0 0 C
Z
V
WO
OL
1L
Sub 2
837A117