Settings P54x/EN ST/La4
MiCOM P543, P544, P545, P546
(ST) 4-35
ST
Setting range
Menu text Default setting Step size
Min. Max.
N>1 Function
IEC S Inverse
DT, IEC S Inverse, IEC V Inverse, IEC E
inverse, UK LT Inverse IEEE M Inverse,
IEEE V Inverse, IEEE E Inverse, US
Inverse, US ST Inverse, IDG
Setting for the tripping characteristic for the first stage earth fault overcurrent element.
N>1 Directional
Non-directional
Non-directional
Directional Fwd
Directional Rev
This mines th sureme first stag ent. setting deter e direction of mea nt for e elem
N>1 Current Set 0.2 x n 0.08 x n 4.0 x n 0.01 x n
Pick-up setting for first s current elemetage over nt.
N1>1 IDG s
1.5 1 4 0.1
This setting is set as a multiple of “N>” setting for the IDG curve (Scandinavian) and
determines the actual relay current threshold at which the element starts.
N>1 Time Delay
1 0 100 0.01
Setting for the time-delay for the definite time s e
setting is available only when DT function is sel
etting if selected for first stage element. Th
ected.
N>1 TMS
1 0.025 1.2 0.005
Setting for the time multiplier setting to adjust the operating time of the IEC IDMT
characteristic.
N>1 Time Dial
1 0.01 100 0.01
Setting for the time multiplier setting to adjust the operating time of the IEEE/US IDMT
e Dial ( a multiplier on th curv n, in
feren
or 7 to achieve ty.
curves. The Tim
achieve the required trip
TD) is
ping time. The re
e standard
ce curve is based o
e equatio
n TD = 1.
order to
Care: Certain manufacturer's use a mid-range value of TD = 5 or 7, so it may be
necessary to divide by 5 pari
N>1 Reset Char.
DT DT or Inverse N/A
Setting to determine the type of reset/release characteristic of the IEEE/US curves.
N>1 tRESET
0 s 0 s 100 s 0.01 s
Setting that determines the reset/release time for definite time reset characteristic.
N1>1 IDG Time
1.2 1 2 0.01
Setting for the IDG curve used to set the minimum operating time at high levels of fa
current.
ult
N>2 Cells as for
N>1 above
Se the same as for the first stage earth fault overcutting rrent element.
N>3 Status
Enabled
Disabled, Enabled, Enabled VTS, Enabled
Ch Fail, En VTSorCh Fail, En VTSandCh
Fail
Setting that defines third stage overcurrent operati status. Depe
se fail)
of communication channel fail, or a combination (and /or) of both.
ng nding of this setting,
IN>3 will be enabled permanently or in case of Voltage Transformer Supervision (fu
operation, or in case
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