DEMA CPM 310 G, User Manual

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tR
tR abbreviation represents the reset time with definite
time characteristics. It determines the time delay to
reset the function after the last successful shot. Setting
time interval is (0.20 – 600.0) s.
tIN
tIn abbreviation represents the inhibition time of auto-
recloser after manual closing of the circuit breaker and
has definite time characteristics. If any faults occur
within the inhibition time, auto-recloser will be blocked
and no shots will be conducted. tIN setting range is
(0.20-600.0) s.
As described before, DEMA CPM 310 G relays are
capable of handling independent procedures of auto-
reclosing when phase fault, earth faults or auxiliary
timer triggers operate. The 2 pictures on the left
bottom side show the menus to set auto-reclosing
options for each individual function covered. The
menus are reached by pressing S2 (

) button after
navigating to the last line of the main ARCL Settings
menu.
The list below shows the functions that are covered by
the auto-recloser feature of CPM 310 G. Configuring
the settings of each function at their dedicated menus,
an auto-reclose scheme can be set up to provide any
desired automatic response to various types and
combinations of faults. E.g., settings can be done so as
to provide multiple shots of auto-reclosing if any
overcurrent faults by 1
st thresholds of phase and earth
protections occur, while prohibiting auto-recloser to be
triggered by the other faults.
1.
t
I> Phase Overcurrent 1 st Threshold Protection
2. tI>> Phase Overcurrent 2 nd Threshold Protection
3. tI>>> Phase Overcurrent 3 rd Threshold Protection
4. tI
e
> Earth Overcurrent 1 st Threshold Protection
5. tI
e
>> Earth Overcurrent 2 nd Threshold Protection
6. tI
e
>>> Earth Overcurrent 3 rd Threshold Protection
7. tAux1 Auxiliary Timer No.1
8.
tAux2 Auxiliary Timer No.2
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