Alstom MiCOM P545 - 1.3.4 Phase differential

P54x/EN ST/La4 Settings
(ST) 4-22 MiCOM P543, P544, P545, P546
ST
Setting range
Menu text Default setting
Min. Max.
Step size
Z4 Sensit. Ignd>4 0.05 x In 0.05 x In 2 x In 0.01 x In
Zone 4 current sensitivity.
1.3.4 Phase diffe
T P x P SE DIFF” is used to:
 characteristic
 tion
 citive Charging current or phase shift compensation).
nt is to set the value of susce
val compensat and P odels on
 restrain in the case of transformers in zone (P543 and P545
 ositive sequence current required for Differential current transformer
T bled in ‘CONFIGURATION’ column.
ing
rential
he column “GROU HA
Select the settings of the phase differential
Define CT correc factors
Define type of compensation (Capa
If charging curre
chosen, to set the
selected,
ue of vector
ptance and if phase shift is
545 mion (P543 ly)
Enable or Disable inrush
models only)
Set the amount of p
supervision
he column “GROUP x PHASE DIFF” is invisible if disa
Sett range
Menu text Default setting
Min. Max.
Step size
Phase Diff Enabled Enabled or Disabled
To enable (activate) or disable (turn off) the Differential protection function in the group.
Phase Is1 0.2In 0.2In 2In 0.05In
Setting that defines the minimum pick-up level of the relay.
Phase Is2 2In 1In 30In 0.05In
This setting defines the bias current threshold, above which the higher percentage bias k2
is used.
Phase k1 30% 30% 150% 5%
The lower percentage bi tting used when th current s2. T rovides as se e bias is below his p
stability for small CT mismatches, whilst ensuring good sensitivity to resistive faults under
heavy load conditions.
Phase k2
150% (2 end or dual
redundant)
100% (3 end)
30% 150% 5%
The higher percentage bias setting used to im
fault current conditions.
prove relay stability under heavy through
Phase Char DT
DT, IEC S Inve nverse, IEC V I rse, IEC E
inverse, UK LT Inverse IEEE M Inverse,
IEEE V e, IEEE E Invers Invers e, US
Inverse, US ST Inverse
Setting for the tripping characteristic for differential protection element.
Phase Time Delay 0 s 0 s 100 s 0.01 s
Setting for the time-delay for the definite time setting if selected etting is ly . The s visible on
when DT function is selected.