Default Settings Restore - GE P741 Technical Manual

Settings
MiCOM P741, P742, P743
MENU TEXT
PU CONF & STATUS
PU in service
List of the PUs in service.
For example a topology scheme may define 12 PU:
5 PU for current phase and 7 PU for future.
This would be set to: 1111100000000000000000000000
PU connected
List of the PUs connected and synchronized with the CU. After reboot the CU waits for the
list of connected PUs to equal the PUs in service before enabling the busbar protection.
If there is a discrepancy the CU will not start and the scheme will be locked.
PU topo valid
List of PUs with valid topology data. After rebooting the CU checks the topology
configuration on all PUs and reports the result in this cell.
If there is a discrepancy the central unit will not start and the scheme will be locked.
Reset Circt Flt
After a circuitry fault has been detected, the user can accept and clear the error, using the
command from this cell. The command will be rejected if the fault is still present.
Circuitry Fault
List of the zones blocked by a circuitry fault
Circ Fault Phase
Faulty phase that blocks by a circuitry fault the zone
Reset PU Error
After a PU communication error has been detected, the user can accept and clear the
error, using the command from this cell. The command will NOT be rejected if the fault is
still present.
PU Error Locked
List of the zones blocked for PU communication error
87BB monitoring
List of the zones on which the differential busbar protection (87BB) is blocked
87BB&50BF disable
List of the zones on which the differential busbar protection (87BB) AND 50BF protection
are blocked
1.1.5

Default settings restore

To restore the default values to the settings in any protection settings group, set the 'restore
defaults' cell to the relevant group number. Alternatively it is possible to set the 'restore
defaults' cell to 'all settings' to restore the default values to all of the relay's settings, not just
the protection groups' settings. The default settings will initially be placed in the scratchpad
and will only be used by the relay after they have been confirmed. Note that restoring
defaults to all settings includes the rear communication port settings, which may result in
communication via the rear port being disrupted if the new (default) settings do not match
those of the master station.
Default Setting
0000000000000000
00000000000
0000000000000000
00000000000
0000000000000000
00000000000
No
00000000
No
00000000
00000000
00000000
P74x/EN ST/Na7
(ST) 4-11
Available Settings
0 or 1
Live values
Live values
Yes or No
Live values
Phase A or B or C or N
Yes or No
Live values
Live values
Live values
ST