Alstom MiCOM P127 - Page 8

P12y/EN FT/D22 Technical Guide
User Guide
Page 6/108 MiCOM P125/P126/P127
Possible software alarm messages are:
tI> instantaneous 1
st
threshold directional/non directional
overcurrent
tI> time delayed 1
st
threshold directional/non directional overcurrent
For the I> and tI> a particular attention has to be taken.
The P126 & P127 are able to identify the phase where the fault occurs, and the
relevant alarm messages are shown in the below listed table.
Menu’ ALARMS
I> PHASE tI> PHASE
A
A
A
A
B
B
B
B
C
C
C
C
A
A
A
A
AB
AB
A
A
A
A
AB
ABC
A
A
A
ABC
ABC
ABC
ABC
ABC
ABC
ABC
I>> 2
nd
alarm threshold directional/non directional overcurrent
I>>> 3
rd
alarm threshold directional/non directional overcurrent
tI> 1
st
trip threshold directional/non directional overcurrent
tI>> 2
nd
trip threshold directional/non directional overcurrent
tI>>> 3
rd
trip threshold directional/non directional overcurrent
Ie> 1
st
alarm threshold directional/non directional earth fault
Ie>> 2
nd
alarm threshold directional/non directional earth fault
Ie>>> 3
rd
alarm threshold directional/non directional earth fault
tIe> 1
st
trip threshold directional/non directional earth fault
tIe>> 2
nd
trip threshold directional/non directional earth fault
tIe>>> 3
rd
trip threshold directional/non directional earth fault
Pe/IeCos> 1
st
alarm threshold wattmetric/IeCos earth fault