ABB SPAC 531 C User Manual And Technical Description page 30

Example 2.
30
Feeder terminal SPAC 531 C1 used for the
protection of an outgoing feeder in a one-breaker
system. The auto-reclose unit is started by the
tripping signals of the phase overcurrent and
neutral overcurrent modules.
In the application illustrated in Fig. 11 auto-
reclosing can be started by the tripping signal of
the high-set and low-set phase overcurrent stage
and the low-set stage of the earth-fault module.
The operate time of the stage starting the auto-
reclose unit must not be longer than the reclaim
time selected for the auto-reclose unit. Should
the operate time be longer than the reclaim
time, the auto-reclose unit resets before a new
start signal is received and the sequence will not
be completed.
Switch SGB/SPCJ 3C3
1 0 no I> start to AR2
2 0 no I>> start to AR2
3 1 I>> start to AR1
4 0 no block. BS 1 to t>
5 0 no block. BS 1 to t>> 0 no block. BS 1 to t>>
6 0 no block. BS 2 to t>
7 0 no block. BS 2 to t>> 0 no block. BS 2 to t>> 0 no TRIP sign. to
8 0 not in use
In the application presented in example 2 the
starting times of the auto-reclose unit have to be
set at zero, because otherwise there will not be
enough time for the auto-reclose unit to be
started by the tripping signal. To prevent the
auto-reclose module from being started by the
starting signal of the low-set phase overcurrent
and low-set neutral overcurrent stage (I> or Iϕ>)
the SGB/1 switches on the PC boards of the
concerned modules have to be in position 0.
Since the start of the I>> stage is used for
blocking the auto-reclose unit, the starting sig-
nal is routed to the auto-reclose unit via the
SGB/3 switch.
The SGB switches on the PC boards of the relay
modules and the SGR switches at the front edge
of the I/O module SPTR 6B11 should be set as
follows:
SGB/SPCS 3C4
0 no Iϕ> start to AR3
0 no Iϕ>> start to AR3 1 I> and I>> trip to
0 no Iϕ>> start to AR1 1 Iϕ> trip to TRIP output
0 no block. BS 1 to t>
0 no block. BS 2 to t>
0 not in use
SGR
0 no I> start to SIGNAL 3
SIGNAL 1
0 not in use
0 not in use
0 not in use
SIGNAL 1
0 no TRIP sign. to
SIGNAL 2