Technical Guide P12y/EN FT/D22
User Guide
MiCOM P125/P126/P127 Page 37/108
4.5 Menu PROTECTION
There are two protection menus they are designated as PROTECTION G1 and
PROTECTION G2 menu and are available for the MiCOM P125, P126 & P127
relays. By opening the PROTECTION menu the user can program the parameters of
various protection functions and settings (thresholds, time delay, logic) associated
with each of the phase or earth protection functions.
The following table shows the protection functions available with each relay.
When Setting Group is set to 1 in the submenu Group Select the function
PROTECTION G1 is activated in the relays.
When Setting Group is set to 2 in the submenu Group Select the function
PROTECTION G2 is activated in the relays.
The main protection functions are listed in the table:
PROTECTION FUNCTIONS ANSI CODE P125 P126 P127
Directional/non directional phase overcurrent 67/50/51 X
Directional/non directional earth fault 67N/50N/51N X X X
Three phase overcurrent 50/51 X
Wattmetric protection Pe/IeCos 32N X X X
Undercurrent 37 X X
Negative phase sequence overcurrent 46 X X
Thermal overload 49 X X
Undervoltage 27 X
Overvoltage 59 X
Residual overvoltage 59N X X X
Autoreclose (4 shots) 79 X X
The various submenus are shown below.
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