ABB SPAC 531 C User Manual And Technical Description page 27

In this example the trips are initiated by the
auto-reclose unit. The start signals are routed via
the SGB switches to the auto-reclose module
that performs a preprogrammed auto-reclose
sequence. AR start times are determined by the
parameters S24, S25 and S35, dead times by the
parameters S26 and S36. When the AR se-
quence has been completed, the relay module
delivers a final trip signal to the output TRIP
(contact X1/3-4). When the overcurrent mod-
ule has performed final tripping an alarm signal
is received from the output SIGNAL 1 (contact
X1/6-7), whereas final tripping initiated by the
earth-fault relay module produces an alarm sig-
nal via output SIGNAL 2 (contact X2/1-2-3).
The AR unit is programmed either from a PC
connected via the RS 232 serial port on the front
panel or over the remote control system via the
SPA bus interface on the rear panel. The param-
eters to be used have been explained in the
manual for the control module SPTO 6D3.
Parameter Value
S78 1
S21 0
S22 1
S23 1
S24 0.10
S25 0.50
S26 0.30
S31 0
S32 0
S33 1
S35 0.50
S36 120
S77 5.0
V151 1
The setting of the AR parameters is described in
detail in the manual for the control module
SPTO 6D3.
Function
Alerts the auto-reclose functions
Prevents AR1 from starting by tripping of the high-set phase
overcurrent stage
Starts AR1 initiated by phase overcurrent
Starts AR1 initiated by neutral overcurrent
Sets AR1 starting time at 0.1 s, AR initiated by phase overcurrent
Sets AR1 starting time at 0.5 s, AR initiated by neutral overcurrent
Sets AR1 dead time at 0.3 s
Prevents AR2 from starting initiated by tripping of the high-set
phase overcurrent stage
Does not start AR2 initiated by phase overcurrent
Starts AR2 initiated by neutral overcurrent
Sets AR2 starting time at 0.5 s, AR initiated by neutral overcurrent
Sets AR2 dead time at 120 s
Sets the reclaim time at 5.0 s
Stores the input parameters
AR functions initiated by overcurrent or earth
fault can be separately delayed. Unwanted auto-
reclose functions due to load inrush currents or
transient earth faults can be averted by delaying
the start of a high-speed auto-reclose (HSAR)
sequence. In the same way, the delay of a delayed
auto-reclose (DAR) sequence prevents an un-
wanted DAR cycle caused by switching inrush
currents following a HSAR cycle. Both HSAR
and DAR functions can be initiated by the high-
set phase overcurrent stage. Then the auto-
reclose functions start without a preceding start
delay.
With the setting shown in example 1 only
HSAR functions are started by the phase over-
current module and both HSAR and DAR
functions by the neutral overcurrent module.
No auto-reclose functions are started by the
high-set phase overcurrent stage.
In the example HSAR has been defined as AR1
and DAR as AR 2.
27