Seg MRI3-C, Manual, Page: 34 / 78

34 TB MRI(K)3-C 03.02 E
5.5.17 Trip delay for high set element
of earth fault supervision
The setting procedure outlined in chapter 5.5.7 applies
here as well.
5.5.18 Fast/Time tripping by switch ON
of the CB for the earth fault high
set lement
The setting procedure outlined in chapter 5.5.4 applies
here as well.
5.5.19 COS/SIN Measurement
(ER/XR-relay type)
Depending on the neutral earthing connection of the
protected system the directional element of the earth fault
relay must be preset to cos
ϕ
or sin
ϕ
measurement.
By pressing <SELECT> the display shows "COS" resp.
"SIN". The desired measuring principle can be selected
by <+> or <-> and must be entered with password. (Re-
fer chapter 4.6)
5.6 AR Parameter
5.6.1 Number of AR shots
Indicates how often the circuit breaker may switch on
again when a fault occurs.
5.6.2 Fault time (t
F
)
Reclosing is permitted during this time. It starts with the
energizing of the corresponding protection devices. A
reclosing attempt follows only if the command time of
the protection devices is shorter than the fault time set at
MRIK3
.
5.6.3 Dead time (t
D
)
Starts with the OFF-signal of the circuit breaker. No clos-
ing command to the circuit breaker is given till expiration
of the set dead time.
5.6.4 Close impulse time (t
CI
)
During close impulse time t
CI
the NO C.B. contact of
MRIK3 is closed. It starts with expiration of the dead
time and is interrupted earlier when the ON-signal of the
circuit breaker is already present before expiration of the
time.
5.6.5 Reclaim time (tR)
This is the time during which - after switching on (also
manually) or after AR - a subsequent reclosing is pre-
vented. If the number of the set shots is reached, the
MRIK3 is blocked for this time after the last reclosing at-
tempt.
The reclaim time is started with the automatic closing
command or by switching on manually. An OFF-
command which occurs after the last permissible AR
leads to a final switching-off.
5.6.6 Fault time activation
This parameter can be used to fix whether the supervi-
sion of the fault time is active for the first tripping action
or for all tripping actions (see 5.6.2)