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Group setting for protection functions
As shown in Figure 5.8-1, protection settings (i.e., OC settings, EF settings, etc.) are segmented
into eight groups, and different setting values of the relays can be set as per circumstances
such as operation conditions and others. Note that changing the group cannot be not carried
out instantly.
Figure 5.8-1 Eight groups for protection settings
(i) Changing group number by menu operation
The user can change the group number using the menu† on the IED screen. See the Chapter
User interface: Setting sub-menu.
(ii) Changing group number by user-programming
Another changing method is provided by programing PLC logics (For more information about
PLC programing, see the Chapter
PLC function.
) Figure 5.8-2 exemplifies a PLC logic:
changing group2 from group1 is performed while BI1 circuit is energized. The group setting
function “Setting (Function ID 201400)” has a signal reception point ‘PLC_Group_ENUM’ in
UNIT type; thus changing the group is performed when either numbers (1 to 8) enters at the
signal reception point. The example logic, designed for changing to group2 from group1,
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