10
CBFAIL alarm
Synchrocheck input
ARSYNC
AR inhibition and
interruption input
ARINH
Recording of auto-
reclose operations
Resetting
The CBFAIL alarm is a 0.2 s pulse that is
obtained when a CB operation fails or the
maintenance monitor reaches or falls below the
set pre-alarm level. A possible auto-reclose
sequence in progress is interrupted by unsuc-
cessful circuit breaker operation.
The ARSYNC input is used, for example, to
delay or to avoid the connection of transmission
lines fed from different directions, when the
phase angle difference of the network sections is
too large. Should there be no information about
synchronism within 2 seconds after the dead
time has elapsed, the auto-reclose sequence will
be locked out and a CBFAIL alarm will be
issued.
When the ARSYNC input is activated (ener-
gized) the synchronism condition is fulfilled.
The switches SGF2/1...5 can be used to specify
whether information about synchronism is re-
quired for the individual AR shots. If the dead
time is short, the circuit breaker can be closed
without synchronism being lost.
When the ARINH input is activated any auto-
reclose operation in progress will be locked out.
When the ARINH signal disappears a reclaim
time t
r
starts, and not until this time has elapsed
an auto-reclose sequence can be carried out.
The auto-reclose module records all shots made
and also successful auto-reclosures. Registers
containing information about the number of
successful auto-reclosures can be accessed over
the serial communication and over the event
reporting system. The auto-reclose module de-
cide if the auto-reclosure (the last AR shot) was
successful or not when the reclaim time t
r
has
elapsed.
Registers containing information about the
number of all shots made can be accessed via the
push-buttons or over the serial communication.
The operation indicators on the front panel of
the relay module, the operation codes on the
display and the registers can be reset via the front
panel push-buttons, an external control signal
or over the serial bus, as shown in the table
below.
Means of resetting
Resetting of
Resetting of
operation indicators
registers
RESET
x
PROGRAM
x
RESET & PROGRAM
x
x
External control signal
ARCTRL, BS2 and RRES, when
SGB_/4=1
x
SGB_/5=1
x
x
Parameter V101
x
Parameter V102
x
x
Activation of the CINH input prevents CB
closing in situations where the CB spring is not
charged or the gas pressure is below the permit-
ted level. When the CINH input is activated
(energized), CB closing is inhibited. If the CINH
input is not reset within two seconds after the
dead time has elapsed, the auto-reclose sequence
will be locked out and a CBFAIL alarm will be
issued.
Inhibition of circuit
breaker closing
CINH
Summary of Contents for SPAA 341 C /E351
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