TB MRIK3 12.00 E
13
4.5.2
Circuit breaker manual closing
If the circuit breaker is closed manually to a faultless
line, first the unit remains blocked during the reclaim
time (adjustable 1 - 300 s) and then changes to "ready"
status. If the circuit breaker is closed manually to a faulty
line (e.g. short circuit), no AR follows. Unit
MRIK3
re-
mains in "inactive" status after protection tripping. This is
indicated on the display by „MANU“.
4.5.3
Circuit breaker manual open
When switching off the circuit breaker manually the unit
changes at once without time delay from "ready" status
into "inactive" status. Auto reclosing is not possible.
The LED CB extinguishes.
4.5.4
Starting AR
When the information "protection energized" and "pro-
tection tripping" is applied, the unit changes from
"ready" status to "starting" status. The LED "AR" lights up.
The "starting" status begins with the start of a fault timer
(tF from 0.1 s to 2.0 s adjustable). The LED tF lights up
red. A tripping timer (set at 0.2 s) is started when the
mains protection tripping command takes place before
expiration of the set fault time. (C.B. must be tripped
within this time). The "start conditions not fulfilled" is
evaluated and the
MRIK3
is locked for the duration of
the reclaim time when there is a time difference be-
tween mains protection-energized and tripping, which is
larger than the set "fault time". The LED tF flashes red. If
the OFF-signal of the C.B. appears before expiration of
the tripping timer, it is evaluated as "start condition ful-
filled" and the unit changes over to "cycle" status. The
LED tF extinguishes. If the OFF-signal does not appear,
however, before expiration of the tripping timer, it will
be evaluated as "start condition not fulfilled" and the unit
changes to „inactive“ status. The LED CB flashes and the
Display shows „CB??“.
Tripping timer: Time from the beginning of the tripping
command until receiving of the C.B. check-back signal.
4.5.5
Unsuccessful reclosing
After the start condition has been fulfilled the unit
changes to "starting" status. Now the dead time tD is
started. The corresponding LED flashes. Unit
MRIK3
can
be programmed for reclosing of one to four times. For
each reclosing a dead time has to be set (t
D1
to t
D4
).
When the dead time has expired and also the other re-
closing conditions have been fulfilled, the reclosing
command is given to the circuit breaker. The reclosing
command remains either as long as the ON-signal from
the circuit breaker appears or the close-impuls-timer (t
CL
)
has expired.
The LED t
CL
lights up for the duration of the close im-
pulse. When the CB-ON message occurs, the LED t
CL
ex-
tinguishes. After expiration of the ON impulse timer the
LED starts flashing and the display shows "CB??"
In the last case a failure of the circuit breaker is sub-
jected. With the beginning of the reclosing command
the reclaim timer is started. When a new “OFF-signal”
of the circuit breaker appears within the reclaim time
and after the last permissible AR, an unsuccessful reclos-
ing will be detected. The LED 0
→
I lights up red and the
display shows „OPEN“. Then the unit quits the "cycle"
status and changes to the "inactive" status. Simultane-
ously a relay can be activated which indicates unsuc-
cessful auto reclosing.
4.5.6
Successful reclosing
If there is no “OFF-signal” of the circuit breaker and no
protection tripping within the reclaim time a successful
reclosing will be detected.
During the reclaim time the display shows „CLOS“ and
the LED 0
→
I lights up green.
The unit now quits the "cycle" status, changes over into
the "ready" status and is ready for the next reclosing.
The LED AR extinguishes and the CB LED lights up. The
display shows „ISEG“.
4.5.7
Repeated reclosing
Is the
MRIK3
programmed for more than single reclos-
ing a further dead time is started after a new “OFF-
signal” from the circuit breaker has appeared. After ex-
piration of this dead time a new reclosing command fol-
lows.
