ABB SPAJ 111 C User Manual page 14

Example 3.
Unbalance protec-
tion of capacitor
battery
14
BS
25 26 27
10 11
SGR/1
U3
4
5
U1
SPAJ 111 C
Fig. 6. The sensitive non-directional earth-fault relay SPAJ 111 C used as the unbalance protection
for a capacitor battery. The selector switch settings are shown in the table on the following page.
P2 P1
S2 S1
+
(~)
Uaux
(~)
-
IRF START2
73 74 75
61 62 70 71 72
≅
_
E
+ -
U3
IRF
SS1
t > TS1
Io>
SGB
SS2
t >>
TS2
Io>>
I/O
L1
L2
L3
0
-
I
I
+
0
+
START1 SIGNAL1 TRIP2 TRIP1
+
77 78 80 81 68 69 65
F
D C B
1
1 1
SGR 3 2 4 7 5 8
-
Rx Tx
SERIAL
PORT
66
A
1
6
U2