ABB SPAC 531 C User Manual And Technical Description page 9

Auto-reclosing
SS1/U1 Start of overcurrent module, stage I>
SS2/U1 Start of overcurrent module, stage I>>
TS1/U1 Trip of overcurrent module, stage I>
TS2/U1 Trip of overcurrent module, stage I>>
SS1/U2 Start of earth-fault module, stage Iϕ>
TS1/U2 Trip of earth-fault module, stage Iϕ>
TS2/U2 Trip of earth-fault module, stage Iϕ>>
ARDUE "Auto-reclosure due" signal from control module
IRF Self-supervision
ENA Enable signal for output signals
A (TRIP) Trip output 1 of protection relay modules ( I>, I>>, Iϕ>, Iϕ>>)
B (SIGNAL1) Alarm output for final trip by overcurrent module or trip output 2 of protection
relay modules
C (SIGNAL 2) Alarm output for final trip by earth-fault module or common alarm output
(I>, I>>, Iϕ>, Iϕ>>)
D (SIGNAL 3) Output relay for starts of overcurrent module, stages I> and I>>
E (SIGNAL 4) Output relay for start of earth-fault module, stage Iϕ>
F (IRF) Self-supervision alarm output
BACTRL Selection of Isinϕ/Icosϕ operation for earth-fault module using an external
control voltage
BS1 Blocking signal 1 for tripping of protection relay modules
BS2 Blocking signal 2 for tripping of protection relay modules
I/O module SPTR 6B11 has a fixed 40 ms delay
for the control of output relays B and C. This
delay is added to the normal operation delay.
When output B is used as a second trip output the
fixed 40 ms delay is by-passed by means of switch
SGR/7.
The control module SPTO 6D3 also incorpo-
rates a flexible auto-reclose unit capable of five
successive auto-reclose shots. Each auto-reclose
shot can be started by three different signals
(AR1, AR2 or AR3) from the overcurrent and
earth-fault modules of the feeder terminal.
The three start initiating signals are either start-
ing or tripping signals of the protection relay
modules. In feeder terminals one of the signals
has typically been reserved for starting or trip-
ping signals of the high-set overcurrent stage,
one signal has been reserved for starting or
tripping signals from the low-set overcurrent
stage and one for starting and tripping signals of
the low-set earth-fault stage. For the confi-
guration of the signals see chapter "Intermodular
control signal exchange".
The input signals and output signals of the I/O
module are permanently wired to the card loca-
tions of the feeder terminal. Since the output
signals are individually wired from each card
location to the I/O module, the modules have
to be plugged into the relay case as shown in the
Fig. on the front page to secure that the connec-
tion diagram for the relay assembly corresponds
to the physical function of the relay.
When the starting signals of the relay modules
are used to start auto-reclosing, the start of the
auto-reclosures can be delayed to avoid unnec-
essary auto-reclose functions. The dead time
can be determined separately for each shot. The
reclaim time, too, is adjustable.
For double-breaker arrangements (duplex) the
auto-reclose programme includes a so called
duplex logic, which always opens both circuit
breakers but gives the closing command only to
that circuit breaker which was the last one to be
closed.
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