DEMA CPM 310 G User Manual page 167

Settings » Automatic Control Settings » Auto-recloser Settings » Settings Group 1/2
A. Once the group selection is made on the menu appeared by clicking Auto-reclose Settings button under the
Automatic Control Settings window, Auto-reclose Settings main menu comes up.
B. Save to Buffer button sends the parameter changes to the DigiConnect buffer. When changes are to be applied
to CPM 310 G unit, Save to Device button must be utilized, which is located under the Buffer tab.
1. This area comprises functionality and characteristics monitoring and modifying fields for the AR function.

Auto-reclose parameter is to be set Active or Passive to have the function into or out of service.

tD1-tD4 parameters are to be set within the range of (0.01-300) s by 0.01s stepping to determine the dead
time durations between the auto-reclosing cycles.

tReset parameter is set within the range of (0.2-600) s in steps of 0.01s to determine when the auto-
recloser decides that the network has reached to the normal service conditions after the last successful
shot.

tInhibit parameter is set within the range of (0.2-600) s in steps of 0.01s to determine how long to prohibit
triggering of an auto-reclose session after the circuit breaker is closed manually.

Cycle Limits parameters can be set between 1 and 4 to determine the limits of maximum cycles.
2. This area shows the active settings of auto-reclosing algorithm. The algorithm can be modified via the controls in
area 3, as marked on the picture above. See the paragraph below.
3. There are two groups of control check boxes in this area.

The first group titled Reclose allows the user to decide on which cycles and for which functions an auto-
reclosing shot is to be triggered. Note that each box in the matrix is aligned to a protection function on the
abscissa and an AR cycle number on the ordinate. The sample settings on the picture above provide 4 cycles
of auto-reclosing if tI>> or tI

The second group titled Trip allows the user to decide on which cycles and for which functions tripping is
allowed. Note that there is an extra column of locked check boxes with S title, which shows that the
initiating trips by protection functions are allowed by default. Prohibition of initial tripping of protection
functions are not allowed here.
protection functions at all 4 cycles
Looking at the picture above, it can be concluded that these sample settings allow tripping for any protection
functions at any cycles, however, if tripping is triggered by a function other than tI>> or tI
cycles, the auto-reclose session will be stopped and the auto-recloser will be blocked. □
7 If anyway tripping by certain active protective functions are needed to be prohibited, utilize the
Automatic Control Settings menu.
>> protection functions trigger a trip.
e
7
The sample settings on the picture above allow tripping by any active
- 167 -
>> on any of the
e
Trip Settings
menu under the