Examples Of Application - ABB SPAJ 111 C User Manual

Examples of
application
Example 1.
Feeder earth-fault
protection
10
BS
25 26 27 10 11
SGR/1
U3
4
5
U1
SPAJ 111 C
1) Blocking signal to be routed to the earth-fault relay of the incoming feeder
Fig. 4. Earth-fault relay SPAJ 111 C used for the protection of an outgoing feeder. The earth-fault
current is measured with a core-balance current transformer. The selector switch positions are
shown in the table on the following page.
+
(~)
Uaux
(~)
-
1)
IRF START2
61 62 70 71 72 73 74 75
≅
_
E
+ -
U3
IRF
SS1
t > TS1
Io>
SGB
SS2
t >>
TS2
Io>>
I/O
L1
L2
L3
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
-
0
-
I
Rx Tx
+
SERIAL
PORT
66
A
1
6
U2