ABB SPAC 531 C User Manual And Technical Description page 32

32
An auto-reclose sequence started by a tripping
signal from the earth-fault module will cause no
unwanted alarm signal over the contacts X2/
1-2-3, as the operation of this contact has been
delayed in the output relay module. The signal-
ling contact X1/6-7 of the phase overcurrent
module operates in the same way. However, the
red operation indicator of the relay module that
Current
Setting I ϕ >
CLOSE
CB position
OPEN
I ϕ > start =
ON
SIGNAL 4
output
OFF
I ϕ > trip =
ON
TRIP output
and AR3
OFF
signal
I ϕ > alarm =
ON
SIGNAL 2
OFF
output
CB OPEN
ON
output
OFF
CB CLOSE
ON
output
OFF
Fig. 14. Signal diagram for an auto-reclose sequence initiated by tripping of stage Iϕ>.
The tripping signals are received directly via the
trip output TRIP (contact X1/3-4). The auto-
reclose functions are started by the tripping
signal. As the starting time (parameters S24,
S25 and S35) of the auto-reclose unit is zero, the
auto-reclose unit performs tripping practically
at the same moment via the OPEN 1 output
(contact X3/11-12). Parameters S26 and S36
are used for setting the time delay before the
auto-reclose unit is allowed to close the circuit
starts an auto-reclose sequence is lit and trip
event data is received over the SPA bus.
Fig. 14 shows the signals and their time rela-
tions, when the start of the auto-reclose unit is
initiated by the tripping signal of the neutral
overcurrent module.
t> t>
S25=0 S35=0
S26
S36
HSAR DAR
(1st AR) (2nd AR)
breaker. When the auto-reclose sequence has
been completed, the relay module performs
final CB tripping and the circuit breaker re-
mains open. An alarm signal is received from the
output SIGNAL 2 (contact X2/1-2-3) when
the earth-fault relay module has given a signal
for final CB tripping and via the output SIG-
NAL 1 (contact X1/6-7), when the signal for
final tripping is received from the phase over-
current module.
t
t>
Final trip