Alstom MiCOM P54 Series - 1.3.11 Aided DEF (only in models with distance option)

Settings P54x/EN ST/La4
MiCOM P543, P544, P545, P546
(ST) 4-37
ST
istance option)
Setting range
1.3.11 Aided DEF (only in models with d
The column GROUP x AIDED DEF is used to set all parameters for operation of DEF
(Directional Earth Fault aided scheme thresholds). As this configuration merely assigns pick
up at the local end only, they need to be further configured to a selected Aided channel
scheme under GROUP x SCHEME LOGIC to provide unit protection.
Menu text Default setting
Min. Max.
Step size
DEF SCHEME
DEF Status Enabled Enabled or Disabled
To enable (activate) or disable (turn off) the Directional Earth Fault elem
an aided scheme (= ground overcurrent pilot scheme). This setting is in
ent that is used in
visible if disabled
in ‘CONFIGURATION’ column.
DEF Polarizing Zero Sequence Neg. Sequence or Zero Sequence
Setting that defines the method of DEF polariza
voltage can be taken as the directional referenc selected, this
tion. Either zero, or negative sequence
e. When Zero Sequence is
arms the Virtual Current Polarizing.
DEF Char Angle -60° -95° 95° 1°
Setting for the relay characteristic angle used fo on. r the directional decisi
DEF VNpol Set 1 V 0.5 V 40 V 0.5 V
Setting that must be exceeded by generated neutral displacement volta
order for the DEF function to be operational.
ge VN (= 3.Vo) in
Polar be in force wh sequen zing is used, this
ensitivity
cts aulted phase, this will artificially ge a large
Vn (ph ground). Only if the phase selector cannot phase will
g is invisible if ‘Neg. Sequence’ polarization is set.
As Virtual Current izing will en Zero ce polari
setting will normally have no relevance. If the relay phase selector (delta s
typically 4% In) dete
typically equal to
the f
ase-
nerate VNpol,
select
this setting be relevant, as VNpol will then measure true VN.
The settin
DEF V2pol Set 1 V 0.5 V 25 V 0.5 V
Setting that must be exceeded by generated negative sequence voltage V2 in ord
DEF function to
er for the
be operational.
visible if ero Sequence’ polari is set. The setting is in ‘Z zation
DEF FWD Set 0.08 x In 0.05 x In 1 x In 0.01 x In
Setting the forward pickup current sensitivity for residual current (= 3.Io).
DEF REV Set 0.04 x In 0.03 x In 1 x In 0.01 x In
Setting the reverse pickup current sensitivity for residual current (= 3.Io).