ABB SPAJ 160 C User Manual And Technical Description page 6

6
The capacitor bank relay contains one external
logic control input, which is activated by a con-
trol signal of the auxiliary voltage level. The in-
fluence of the control input on the relay is de-
termined by programming switches of the meas-
uring module. The control input can be used
either for blocking one or more of the protec-
tive stages, for carrying out an external trip or-
der, for inhibiting a reconnection attempt or/
and for resetting a latched output relay in the
manual reset mode.
IL1
IL2
COMPENSATION FOR NATURAL
PHASE UNBALANCE
CAPACITOR BANK PROTECTION
IL3
WITH ALARM/TRIP STAGE
UNDERCURRENT DETECTION
FOR RECONNECTION INHIBIT
∆ ∆ ∆ ∆
I
RECONNECTION INHIBIT TIMER
CONTROL
INPUT BS1
SERIAL COMMUNICATION
Fig. 7. Checking functions of the capacitor bank overload and unbalance prot. relay type
SPAJ 160 C.
OVERLOAD PROTECTION
The protective relay is provided with a man-
machine interface on the front panel. The man-
machine interface shows relay activation's, meas-
ured values, maximum value registrations, start-
ing counters, time counters and setting values.
All changes of setting values can be made by
using the push-buttons on the front panel.
Through the serial bus the man-machine com-
munication can be obtained either by using a
PC with a setting tool program, a SCS local
control system or a microSCADA remote con-
trol system.
TRIP
SIGNAL 1
SIGNAL 2
START
51N
RECONNECTION
ENABLE
37
IRF
62
SERIAL I/O